src/libFLAC/stream_encoder.c

   1 /* libFLAC - Free Lossless Audio Codec library
   2  * Copyright (C) 2000,2001,2002,2003,2004,2005,2006,2007  Josh Coalson
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * - Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  * - Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  *
  15  * - Neither the name of the Xiph.org Foundation nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  26  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  27  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  28  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  29  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #if HAVE_CONFIG_H
  33 #  include <config.h>
  34 #endif
  35
  36 #if defined _MSC_VER || defined __MINGW32__
  37 #include <io.h> /* for _setmode() */
  38 #include <fcntl.h> /* for _O_BINARY */
  39 #endif
  40 #if defined __CYGWIN__ || defined __EMX__
  41 #include <io.h> /* for setmode(), O_BINARY */
  42 #include <fcntl.h> /* for _O_BINARY */
  43 #endif
  44 #include <limits.h>
  45 #include <stdio.h>
  46 #include <stdlib.h> /* for malloc() */
  47 #include <string.h> /* for memcpy() */
  48 #include <sys/types.h> /* for off_t */
  49 #if defined _MSC_VER || defined __BORLANDC__ || defined __MINGW32__
  50 #if _MSC_VER <= 1600 || defined __BORLANDC__ /* @@@ [2G limit] */
  51 #define fseeko fseek
  52 #define ftello ftell
  53 #endif
  54 #endif
  55 #include "FLAC/assert.h"
  56 #include "FLAC/stream_decoder.h"
  57 #include "protected/stream_encoder.h"
  58 #include "private/bitwriter.h"
  59 #include "private/bitmath.h"
  60 #include "private/crc.h"
  61 #include "private/cpu.h"
  62 #include "private/fixed.h"
  63 #include "private/format.h"
  64 #include "private/lpc.h"
  65 #include "private/md5.h"
  66 #include "private/memory.h"
  67 #if FLAC__HAS_OGG
  68 #include "private/ogg_helper.h"
  69 #include "private/ogg_mapping.h"
  70 #endif
  71 #include "private/stream_encoder_framing.h"
  72 #include "private/window.h"
  73
  74 #ifndef FLaC__INLINE
  75 #define FLaC__INLINE
  76 #endif
  77
  78 #ifdef min
  79 #undef min
  80 #endif
  81 #define min(x,y) ((x)<(y)?(x):(y))
  82
  83 #ifdef max
  84 #undef max
  85 #endif
  86 #define max(x,y) ((x)>(y)?(x):(y))
  87
  88 /* Exact Rice codeword length calculation is off by default.  The simple
  89  * (and fast) estimation (of how many bits a residual value will be
  90  * encoded with) in this encoder is very good, almost always yielding
  91  * compression within 0.1% of exact calculation.
  92  */
  93 #undef EXACT_RICE_BITS_CALCULATION
  94 /* Rice parameter searching is off by default.  The simple (and fast)
  95  * parameter estimation in this encoder is very good, almost always
  96  * yielding compression within 0.1% of the optimal parameters.
  97  */
  98 #undef ENABLE_RICE_PARAMETER_SEARCH
  99
 100
 101 typedef struct {
 102         FLAC__int32 *data[FLAC__MAX_CHANNELS];
 103         unsigned size; /* of each data[] in samples */
 104         unsigned tail;
 105 } verify_input_fifo;
 106
 107 typedef struct {
 108         const FLAC__byte *data;
 109         unsigned capacity;
 110         unsigned bytes;
 111 } verify_output;
 112
 113 typedef enum {
 114         ENCODER_IN_MAGIC = 0,
 115         ENCODER_IN_METADATA = 1,
 116         ENCODER_IN_AUDIO = 2
 117 } EncoderStateHint;
 118
 119 static struct CompressionLevels {
 120         FLAC__bool do_mid_side_stereo;
 121         FLAC__bool loose_mid_side_stereo;
 122         unsigned max_lpc_order;
 123         unsigned qlp_coeff_precision;
 124         FLAC__bool do_qlp_coeff_prec_search;
 125         FLAC__bool do_escape_coding;
 126         FLAC__bool do_exhaustive_model_search;
 127         unsigned min_residual_partition_order;
 128         unsigned max_residual_partition_order;
 129         unsigned rice_parameter_search_dist;
 130 } compression_levels_[] = {
 131         { false, false,  0, 0, false, false, false, 0, 3, 0 },
 132         { true , true ,  0, 0, false, false, false, 0, 3, 0 },
 133         { true , false,  0, 0, false, false, false, 0, 3, 0 },
 134         { false, false,  6, 0, false, false, false, 0, 4, 0 },
 135         { true , true ,  8, 0, false, false, false, 0, 4, 0 },
 136         { true , false,  8, 0, false, false, false, 0, 5, 0 },
 137         { true , false,  8, 0, false, false, false, 0, 6, 0 },
 138         { true , false,  8, 0, false, false, true , 0, 6, 0 },
 139         { true , false, 12, 0, false, false, true , 0, 6, 0 }
 140 };
 141
 142
 143 /***********************************************************************
 144  *
 145  * Private class method prototypes
 146  *
 147  ***********************************************************************/
 148
 149 static void set_defaults_(FLAC__StreamEncoder *encoder);
 150 static void free_(FLAC__StreamEncoder *encoder);
 151 static FLAC__bool resize_buffers_(FLAC__StreamEncoder *encoder, unsigned new_blocksize);
 152 static FLAC__bool write_bitbuffer_(FLAC__StreamEncoder *encoder, unsigned samples, FLAC__bool is_last_block);
 153 static FLAC__StreamEncoderWriteStatus write_frame_(FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], size_t bytes, unsigned samples, FLAC__bool is_last_block);
 154 static void update_metadata_(const FLAC__StreamEncoder *encoder);
 155 #if FLAC__HAS_OGG
 156 static void update_ogg_metadata_(FLAC__StreamEncoder *encoder);
 157 #endif
 158 static FLAC__bool process_frame_(FLAC__StreamEncoder *encoder, FLAC__bool is_fractional_block, FLAC__bool is_last_block);
 159 static FLAC__bool process_subframes_(FLAC__StreamEncoder *encoder, FLAC__bool is_fractional_block);
 160
 161 static FLAC__bool process_subframe_(
 162         FLAC__StreamEncoder *encoder,
 163         unsigned min_partition_order,
 164         unsigned max_partition_order,
 165         const FLAC__FrameHeader *frame_header,
 166         unsigned subframe_bps,
 167         const FLAC__int32 integer_signal[],
 168 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 169         const FLAC__real real_signal[],
 170 #endif
 171         FLAC__Subframe *subframe[2],
 172         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents[2],
 173         FLAC__int32 *residual[2],
 174         unsigned *best_subframe,
 175         unsigned *best_bits
 176 );
 177
 178 static FLAC__bool add_subframe_(
 179         FLAC__StreamEncoder *encoder,
 180         unsigned blocksize,
 181         unsigned subframe_bps,
 182         const FLAC__Subframe *subframe,
 183         FLAC__BitWriter *frame
 184 );
 185
 186 static unsigned evaluate_constant_subframe_(
 187         FLAC__StreamEncoder *encoder,
 188         const FLAC__int32 signal,
 189         unsigned blocksize,
 190         unsigned subframe_bps,
 191         FLAC__Subframe *subframe
 192 );
 193
 194 static unsigned evaluate_fixed_subframe_(
 195         FLAC__StreamEncoder *encoder,
 196         const FLAC__int32 signal[],
 197         FLAC__int32 residual[],
 198         FLAC__uint64 abs_residual_partition_sums[],
 199         unsigned raw_bits_per_partition[],
 200         unsigned blocksize,
 201         unsigned subframe_bps,
 202         unsigned order,
 203         unsigned rice_parameter,
 204         unsigned min_partition_order,
 205         unsigned max_partition_order,
 206         FLAC__bool do_escape_coding,
 207         unsigned rice_parameter_search_dist,
 208         FLAC__Subframe *subframe,
 209         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents
 210 );
 211
 212 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 213 static unsigned evaluate_lpc_subframe_(
 214         FLAC__StreamEncoder *encoder,
 215         const FLAC__int32 signal[],
 216         FLAC__int32 residual[],
 217         FLAC__uint64 abs_residual_partition_sums[],
 218         unsigned raw_bits_per_partition[],
 219         const FLAC__real lp_coeff[],
 220         unsigned blocksize,
 221         unsigned subframe_bps,
 222         unsigned order,
 223         unsigned qlp_coeff_precision,
 224         unsigned rice_parameter,
 225         unsigned min_partition_order,
 226         unsigned max_partition_order,
 227         FLAC__bool do_escape_coding,
 228         unsigned rice_parameter_search_dist,
 229         FLAC__Subframe *subframe,
 230         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents
 231 );
 232 #endif
 233
 234 static unsigned evaluate_verbatim_subframe_(
 235         FLAC__StreamEncoder *encoder,
 236         const FLAC__int32 signal[],
 237         unsigned blocksize,
 238         unsigned subframe_bps,
 239         FLAC__Subframe *subframe
 240 );
 241
 242 static unsigned find_best_partition_order_(
 243         struct FLAC__StreamEncoderPrivate *private_,
 244         const FLAC__int32 residual[],
 245         FLAC__uint64 abs_residual_partition_sums[],
 246         unsigned raw_bits_per_partition[],
 247         unsigned residual_samples,
 248         unsigned predictor_order,
 249         unsigned rice_parameter,
 250         unsigned min_partition_order,
 251         unsigned max_partition_order,
 252         FLAC__bool do_escape_coding,
 253         unsigned rice_parameter_search_dist,
 254         FLAC__EntropyCodingMethod_PartitionedRice *best_partitioned_rice
 255 );
 256
 257 static void precompute_partition_info_sums_(
 258         const FLAC__int32 residual[],
 259         FLAC__uint64 abs_residual_partition_sums[],
 260         unsigned residual_samples,
 261         unsigned predictor_order,
 262         unsigned min_partition_order,
 263         unsigned max_partition_order
 264 );
 265
 266 static void precompute_partition_info_escapes_(
 267         const FLAC__int32 residual[],
 268         unsigned raw_bits_per_partition[],
 269         unsigned residual_samples,
 270         unsigned predictor_order,
 271         unsigned min_partition_order,
 272         unsigned max_partition_order
 273 );
 274
 275 static FLAC__bool set_partitioned_rice_(
 276 #ifdef EXACT_RICE_BITS_CALCULATION
 277         const FLAC__int32 residual[],
 278 #endif
 279         const FLAC__uint64 abs_residual_partition_sums[],
 280         const unsigned raw_bits_per_partition[],
 281         const unsigned residual_samples,
 282         const unsigned predictor_order,
 283         const unsigned suggested_rice_parameter,
 284         const unsigned rice_parameter_search_dist,
 285         const unsigned partition_order,
 286         const FLAC__bool search_for_escapes,
 287         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents,
 288         unsigned *bits
 289 );
 290
 291 static unsigned get_wasted_bits_(FLAC__int32 signal[], unsigned samples);
 292
 293 /* verify-related routines: */
 294 static void append_to_verify_fifo_(
 295         verify_input_fifo *fifo,
 296         const FLAC__int32 * const input[],
 297         unsigned input_offset,
 298         unsigned channels,
 299         unsigned wide_samples
 300 );
 301
 302 static void append_to_verify_fifo_interleaved_(
 303         verify_input_fifo *fifo,
 304         const FLAC__int32 input[],
 305         unsigned input_offset,
 306         unsigned channels,
 307         unsigned wide_samples
 308 );
 309
 310 static FLAC__StreamDecoderReadStatus verify_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
 311 static FLAC__StreamDecoderWriteStatus verify_write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
 312 static void verify_metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
 313 static void verify_error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
 314
 315 static FLAC__StreamEncoderReadStatus file_read_callback_(const FLAC__StreamEncoder *encoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
 316 static FLAC__StreamEncoderSeekStatus file_seek_callback_(const FLAC__StreamEncoder *encoder, FLAC__uint64 absolute_byte_offset, void *client_data);
 317 static FLAC__StreamEncoderTellStatus file_tell_callback_(const FLAC__StreamEncoder *encoder, FLAC__uint64 *absolute_byte_offset, void *client_data);
 318 static FLAC__StreamEncoderWriteStatus file_write_callback_(const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], size_t bytes, unsigned samples, unsigned current_frame, void *client_data);
 319 static FILE *get_binary_stdout_(void);
 320
 321
 322 /***********************************************************************
 323  *
 324  * Private class data
 325  *
 326  ***********************************************************************/
 327
 328 typedef struct FLAC__StreamEncoderPrivate {
 329         unsigned input_capacity;                          /* current size (in samples) of the signal and residual buffers */
 330         FLAC__int32 *integer_signal[FLAC__MAX_CHANNELS];  /* the integer version of the input signal */
 331         FLAC__int32 *integer_signal_mid_side[2];          /* the integer version of the mid-side input signal (stereo only) */
 332 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 333         FLAC__real *real_signal[FLAC__MAX_CHANNELS];      /* the floating-point version of the input signal */
 334         FLAC__real *real_signal_mid_side[2];              /* the floating-point version of the mid-side input signal (stereo only) */
 335         FLAC__real *window[FLAC__MAX_APODIZATION_FUNCTIONS]; /* the pre-computed floating-point window for each apodization function */
 336         FLAC__real *windowed_signal;                      /* the real_signal[] * current window[] */
 337 #endif
 338         unsigned subframe_bps[FLAC__MAX_CHANNELS];        /* the effective bits per sample of the input signal (stream bps - wasted bits) */
 339         unsigned subframe_bps_mid_side[2];                /* the effective bits per sample of the mid-side input signal (stream bps - wasted bits + 0/1) */
 340         FLAC__int32 *residual_workspace[FLAC__MAX_CHANNELS][2]; /* each channel has a candidate and best workspace where the subframe residual signals will be stored */
 341         FLAC__int32 *residual_workspace_mid_side[2][2];
 342         FLAC__Subframe subframe_workspace[FLAC__MAX_CHANNELS][2];
 343         FLAC__Subframe subframe_workspace_mid_side[2][2];
 344         FLAC__Subframe *subframe_workspace_ptr[FLAC__MAX_CHANNELS][2];
 345         FLAC__Subframe *subframe_workspace_ptr_mid_side[2][2];
 346         FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents_workspace[FLAC__MAX_CHANNELS][2];
 347         FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents_workspace_mid_side[FLAC__MAX_CHANNELS][2];
 348         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents_workspace_ptr[FLAC__MAX_CHANNELS][2];
 349         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents_workspace_ptr_mid_side[FLAC__MAX_CHANNELS][2];
 350         unsigned best_subframe[FLAC__MAX_CHANNELS];       /* index (0 or 1) into 2nd dimension of the above workspaces */
 351         unsigned best_subframe_mid_side[2];
 352         unsigned best_subframe_bits[FLAC__MAX_CHANNELS];  /* size in bits of the best subframe for each channel */
 353         unsigned best_subframe_bits_mid_side[2];
 354         FLAC__uint64 *abs_residual_partition_sums;        /* workspace where the sum of abs(candidate residual) for each partition is stored */
 355         unsigned *raw_bits_per_partition;                 /* workspace where the sum of silog2(candidate residual) for each partition is stored */
 356         FLAC__BitWriter *frame;                           /* the current frame being worked on */
 357         unsigned loose_mid_side_stereo_frames;            /* rounded number of frames the encoder will use before trying both independent and mid/side frames again */
 358         unsigned loose_mid_side_stereo_frame_count;       /* number of frames using the current channel assignment */
 359         FLAC__ChannelAssignment last_channel_assignment;
 360         FLAC__StreamMetadata streaminfo;                  /* scratchpad for STREAMINFO as it is built */
 361         FLAC__StreamMetadata_SeekTable *seek_table;       /* pointer into encoder->protected_->metadata_ where the seek table is */
 362         unsigned current_sample_number;
 363         unsigned current_frame_number;
 364         FLAC__MD5Context md5context;
 365         FLAC__CPUInfo cpuinfo;
 366 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 367         unsigned (*local_fixed_compute_best_predictor)(const FLAC__int32 data[], unsigned data_len, FLAC__float residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]);
 368 #else
 369         unsigned (*local_fixed_compute_best_predictor)(const FLAC__int32 data[], unsigned data_len, FLAC__fixedpoint residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]);
 370 #endif
 371 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 372         void (*local_lpc_compute_autocorrelation)(const FLAC__real data[], unsigned data_len, unsigned lag, FLAC__real autoc[]);
 373         void (*local_lpc_compute_residual_from_qlp_coefficients)(const FLAC__int32 *data, unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 residual[]);
 374         void (*local_lpc_compute_residual_from_qlp_coefficients_64bit)(const FLAC__int32 *data, unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 residual[]);
 375         void (*local_lpc_compute_residual_from_qlp_coefficients_16bit)(const FLAC__int32 *data, unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 residual[]);
 376 #endif
 377         FLAC__bool use_wide_by_block;          /* use slow 64-bit versions of some functions because of the block size */
 378         FLAC__bool use_wide_by_partition;      /* use slow 64-bit versions of some functions because of the min partition order and blocksize */
 379         FLAC__bool use_wide_by_order;          /* use slow 64-bit versions of some functions because of the lpc order */
 380         FLAC__bool disable_constant_subframes;
 381         FLAC__bool disable_fixed_subframes;
 382         FLAC__bool disable_verbatim_subframes;
 383 #if FLAC__HAS_OGG
 384         FLAC__bool is_ogg;
 385 #endif
 386         FLAC__StreamEncoderReadCallback read_callback; /* currently only needed for Ogg FLAC */
 387         FLAC__StreamEncoderSeekCallback seek_callback;
 388         FLAC__StreamEncoderTellCallback tell_callback;
 389         FLAC__StreamEncoderWriteCallback write_callback;
 390         FLAC__StreamEncoderMetadataCallback metadata_callback;
 391         FLAC__StreamEncoderProgressCallback progress_callback;
 392         void *client_data;
 393         unsigned first_seekpoint_to_check;
 394         FILE *file;                            /* only used when encoding to a file */
 395         FLAC__uint64 bytes_written;
 396         FLAC__uint64 samples_written;
 397         unsigned frames_written;
 398         unsigned total_frames_estimate;
 399         /* unaligned (original) pointers to allocated data */
 400         FLAC__int32 *integer_signal_unaligned[FLAC__MAX_CHANNELS];
 401         FLAC__int32 *integer_signal_mid_side_unaligned[2];
 402 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 403         FLAC__real *real_signal_unaligned[FLAC__MAX_CHANNELS];
 404         FLAC__real *real_signal_mid_side_unaligned[2];
 405         FLAC__real *window_unaligned[FLAC__MAX_APODIZATION_FUNCTIONS];
 406         FLAC__real *windowed_signal_unaligned;
 407 #endif
 408         FLAC__int32 *residual_workspace_unaligned[FLAC__MAX_CHANNELS][2];
 409         FLAC__int32 *residual_workspace_mid_side_unaligned[2][2];
 410         FLAC__uint64 *abs_residual_partition_sums_unaligned;
 411         unsigned *raw_bits_per_partition_unaligned;
 412         /*
 413          * These fields have been moved here from private function local
 414          * declarations merely to save stack space during encoding.
 415          */
 416 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 417         FLAC__real lp_coeff[FLAC__MAX_LPC_ORDER][FLAC__MAX_LPC_ORDER]; /* from process_subframe_() */
 418 #endif
 419         FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents_extra[2]; /* from find_best_partition_order_() */
 420         /*
 421          * The data for the verify section
 422          */
 423         struct {
 424                 FLAC__StreamDecoder *decoder;
 425                 EncoderStateHint state_hint;
 426                 FLAC__bool needs_magic_hack;
 427                 verify_input_fifo input_fifo;
 428                 verify_output output;
 429                 struct {
 430                         FLAC__uint64 absolute_sample;
 431                         unsigned frame_number;
 432                         unsigned channel;
 433                         unsigned sample;
 434                         FLAC__int32 expected;
 435                         FLAC__int32 got;
 436                 } error_stats;
 437         } verify;
 438         FLAC__bool is_being_deleted; /* if true, call to ..._finish() from ..._delete() will not call the callbacks */
 439 } FLAC__StreamEncoderPrivate;
 440
 441 /***********************************************************************
 442  *
 443  * Public static class data
 444  *
 445  ***********************************************************************/
 446
 447 FLAC_API const char * const FLAC__StreamEncoderStateString[] = {
 448         "FLAC__STREAM_ENCODER_OK",
 449         "FLAC__STREAM_ENCODER_UNINITIALIZED",
 450         "FLAC__STREAM_ENCODER_OGG_ERROR",
 451         "FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR",
 452         "FLAC__STREAM_ENCODER_VERIFY_MISMATCH_IN_AUDIO_DATA",
 453         "FLAC__STREAM_ENCODER_CLIENT_ERROR",
 454         "FLAC__STREAM_ENCODER_IO_ERROR",
 455         "FLAC__STREAM_ENCODER_FRAMING_ERROR",
 456         "FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR"
 457 };
 458
 459 FLAC_API const char * const FLAC__StreamEncoderInitStatusString[] = {
 460         "FLAC__STREAM_ENCODER_INIT_STATUS_OK",
 461         "FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR",
 462         "FLAC__STREAM_ENCODER_INIT_STATUS_UNSUPPORTED_CONTAINER",
 463         "FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_CALLBACKS",
 464         "FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_NUMBER_OF_CHANNELS",
 465         "FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_BITS_PER_SAMPLE",
 466         "FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_SAMPLE_RATE",
 467         "FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_BLOCK_SIZE",
 468         "FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_MAX_LPC_ORDER",
 469         "FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_QLP_COEFF_PRECISION",
 470         "FLAC__STREAM_ENCODER_INIT_STATUS_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER",
 471         "FLAC__STREAM_ENCODER_INIT_STATUS_NOT_STREAMABLE",
 472         "FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA",
 473         "FLAC__STREAM_ENCODER_INIT_STATUS_ALREADY_INITIALIZED"
 474 };
 475
 476 FLAC_API const char * const FLAC__treamEncoderReadStatusString[] = {
 477         "FLAC__STREAM_ENCODER_READ_STATUS_CONTINUE",
 478         "FLAC__STREAM_ENCODER_READ_STATUS_END_OF_STREAM",
 479         "FLAC__STREAM_ENCODER_READ_STATUS_ABORT",
 480         "FLAC__STREAM_ENCODER_READ_STATUS_UNSUPPORTED"
 481 };
 482
 483 FLAC_API const char * const FLAC__StreamEncoderWriteStatusString[] = {
 484         "FLAC__STREAM_ENCODER_WRITE_STATUS_OK",
 485         "FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR"
 486 };
 487
 488 FLAC_API const char * const FLAC__StreamEncoderSeekStatusString[] = {
 489         "FLAC__STREAM_ENCODER_SEEK_STATUS_OK",
 490         "FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR",
 491         "FLAC__STREAM_ENCODER_SEEK_STATUS_UNSUPPORTED"
 492 };
 493
 494 FLAC_API const char * const FLAC__StreamEncoderTellStatusString[] = {
 495         "FLAC__STREAM_ENCODER_TELL_STATUS_OK",
 496         "FLAC__STREAM_ENCODER_TELL_STATUS_ERROR",
 497         "FLAC__STREAM_ENCODER_TELL_STATUS_UNSUPPORTED"
 498 };
 499
 500 /* Number of samples that will be overread to watch for end of stream.  By
 501  * 'overread', we mean that the FLAC__stream_encoder_process*() calls will
 502  * always try to read blocksize+1 samples before encoding a block, so that
 503  * even if the stream has a total sample count that is an integral multiple
 504  * of the blocksize, we will still notice when we are encoding the last
 505  * block.  This is needed, for example, to correctly set the end-of-stream
 506  * marker in Ogg FLAC.
 507  *
 508  * WATCHOUT: some parts of the code assert that OVERREAD_ == 1 and there's
 509  * not really any reason to change it.
 510  */
 511 static const unsigned OVERREAD_ = 1;
 512
 513 /***********************************************************************
 514  *
 515  * Class constructor/destructor
 516  *
 517  */
 518 FLAC_API FLAC__StreamEncoder *FLAC__stream_encoder_new(void)
 519 {
 520         FLAC__StreamEncoder *encoder;
 521         unsigned i;
 522
 523         FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
 524
 525         encoder = (FLAC__StreamEncoder*)calloc(1, sizeof(FLAC__StreamEncoder));
 526         if(encoder == 0) {
 527                 return 0;
 528         }
 529
 530         encoder->protected_ = (FLAC__StreamEncoderProtected*)calloc(1, sizeof(FLAC__StreamEncoderProtected));
 531         if(encoder->protected_ == 0) {
 532                 free(encoder);
 533                 return 0;
 534         }
 535
 536         encoder->private_ = (FLAC__StreamEncoderPrivate*)calloc(1, sizeof(FLAC__StreamEncoderPrivate));
 537         if(encoder->private_ == 0) {
 538                 free(encoder->protected_);
 539                 free(encoder);
 540                 return 0;
 541         }
 542
 543         encoder->private_->frame = FLAC__bitwriter_new();
 544         if(encoder->private_->frame == 0) {
 545                 free(encoder->private_);
 546                 free(encoder->protected_);
 547                 free(encoder);
 548                 return 0;
 549         }
 550
 551         encoder->private_->file = 0;
 552
 553         set_defaults_(encoder);
 554
 555         encoder->private_->is_being_deleted = false;
 556
 557         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 558                 encoder->private_->subframe_workspace_ptr[i][0] = &encoder->private_->subframe_workspace[i][0];
 559                 encoder->private_->subframe_workspace_ptr[i][1] = &encoder->private_->subframe_workspace[i][1];
 560         }
 561         for(i = 0; i < 2; i++) {
 562                 encoder->private_->subframe_workspace_ptr_mid_side[i][0] = &encoder->private_->subframe_workspace_mid_side[i][0];
 563                 encoder->private_->subframe_workspace_ptr_mid_side[i][1] = &encoder->private_->subframe_workspace_mid_side[i][1];
 564         }
 565         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 566                 encoder->private_->partitioned_rice_contents_workspace_ptr[i][0] = &encoder->private_->partitioned_rice_contents_workspace[i][0];
 567                 encoder->private_->partitioned_rice_contents_workspace_ptr[i][1] = &encoder->private_->partitioned_rice_contents_workspace[i][1];
 568         }
 569         for(i = 0; i < 2; i++) {
 570                 encoder->private_->partitioned_rice_contents_workspace_ptr_mid_side[i][0] = &encoder->private_->partitioned_rice_contents_workspace_mid_side[i][0];
 571                 encoder->private_->partitioned_rice_contents_workspace_ptr_mid_side[i][1] = &encoder->private_->partitioned_rice_contents_workspace_mid_side[i][1];
 572         }
 573
 574         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 575                 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&encoder->private_->partitioned_rice_contents_workspace[i][0]);
 576                 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&encoder->private_->partitioned_rice_contents_workspace[i][1]);
 577         }
 578         for(i = 0; i < 2; i++) {
 579                 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&encoder->private_->partitioned_rice_contents_workspace_mid_side[i][0]);
 580                 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&encoder->private_->partitioned_rice_contents_workspace_mid_side[i][1]);
 581         }
 582         for(i = 0; i < 2; i++)
 583                 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&encoder->private_->partitioned_rice_contents_extra[i]);
 584
 585         encoder->protected_->state = FLAC__STREAM_ENCODER_UNINITIALIZED;
 586
 587         return encoder;
 588 }
 589
 590 FLAC_API void FLAC__stream_encoder_delete(FLAC__StreamEncoder *encoder)
 591 {
 592         unsigned i;
 593
 594         FLAC__ASSERT(0 != encoder);
 595         FLAC__ASSERT(0 != encoder->protected_);
 596         FLAC__ASSERT(0 != encoder->private_);
 597         FLAC__ASSERT(0 != encoder->private_->frame);
 598
 599         encoder->private_->is_being_deleted = true;
 600
 601         (void)FLAC__stream_encoder_finish(encoder);
 602
 603         if(0 != encoder->private_->verify.decoder)
 604                 FLAC__stream_decoder_delete(encoder->private_->verify.decoder);
 605
 606         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 607                 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&encoder->private_->partitioned_rice_contents_workspace[i][0]);
 608                 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&encoder->private_->partitioned_rice_contents_workspace[i][1]);
 609         }
 610         for(i = 0; i < 2; i++) {
 611                 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&encoder->private_->partitioned_rice_contents_workspace_mid_side[i][0]);
 612                 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&encoder->private_->partitioned_rice_contents_workspace_mid_side[i][1]);
 613         }
 614         for(i = 0; i < 2; i++)
 615                 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&encoder->private_->partitioned_rice_contents_extra[i]);
 616
 617         FLAC__bitwriter_delete(encoder->private_->frame);
 618         free(encoder->private_);
 619         free(encoder->protected_);
 620         free(encoder);
 621 }
 622
 623 /***********************************************************************
 624  *
 625  * Public class methods
 626  *
 627  ***********************************************************************/
 628
 629 static FLAC__StreamEncoderInitStatus init_stream_internal_(
 630         FLAC__StreamEncoder *encoder,
 631         FLAC__StreamEncoderReadCallback read_callback,
 632         FLAC__StreamEncoderWriteCallback write_callback,
 633         FLAC__StreamEncoderSeekCallback seek_callback,
 634         FLAC__StreamEncoderTellCallback tell_callback,
 635         FLAC__StreamEncoderMetadataCallback metadata_callback,
 636         void *client_data,
 637         FLAC__bool is_ogg
 638 )
 639 {
 640         unsigned i;
 641         FLAC__bool metadata_has_seektable, metadata_has_vorbis_comment, metadata_picture_has_type1, metadata_picture_has_type2;
 642
 643         FLAC__ASSERT(0 != encoder);
 644
 645         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 646                 return FLAC__STREAM_ENCODER_INIT_STATUS_ALREADY_INITIALIZED;
 647
 648 #if !FLAC__HAS_OGG
 649         if(is_ogg)
 650                 return FLAC__STREAM_ENCODER_INIT_STATUS_UNSUPPORTED_CONTAINER;
 651 #endif
 652
 653         if(0 == write_callback || (seek_callback && 0 == tell_callback))
 654                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_CALLBACKS;
 655
 656         if(encoder->protected_->channels == 0 || encoder->protected_->channels > FLAC__MAX_CHANNELS)
 657                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_NUMBER_OF_CHANNELS;
 658
 659         if(encoder->protected_->channels != 2) {
 660                 encoder->protected_->do_mid_side_stereo = false;
 661                 encoder->protected_->loose_mid_side_stereo = false;
 662         }
 663         else if(!encoder->protected_->do_mid_side_stereo)
 664                 encoder->protected_->loose_mid_side_stereo = false;
 665
 666         if(encoder->protected_->bits_per_sample >= 32)
 667                 encoder->protected_->do_mid_side_stereo = false; /* since we currenty do 32-bit math, the side channel would have 33 bps and overflow */
 668
 669         if(encoder->protected_->bits_per_sample < FLAC__MIN_BITS_PER_SAMPLE || encoder->protected_->bits_per_sample > FLAC__REFERENCE_CODEC_MAX_BITS_PER_SAMPLE)
 670                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_BITS_PER_SAMPLE;
 671
 672         if(!FLAC__format_sample_rate_is_valid(encoder->protected_->sample_rate))
 673                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_SAMPLE_RATE;
 674
 675         if(encoder->protected_->blocksize == 0) {
 676                 if(encoder->protected_->max_lpc_order == 0)
 677                         encoder->protected_->blocksize = 1152;
 678                 else
 679                         encoder->protected_->blocksize = 4096;
 680         }
 681
 682         if(encoder->protected_->blocksize < FLAC__MIN_BLOCK_SIZE || encoder->protected_->blocksize > FLAC__MAX_BLOCK_SIZE)
 683                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_BLOCK_SIZE;
 684
 685         if(encoder->protected_->max_lpc_order > FLAC__MAX_LPC_ORDER)
 686                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_MAX_LPC_ORDER;
 687
 688         if(encoder->protected_->blocksize < encoder->protected_->max_lpc_order)
 689                 return FLAC__STREAM_ENCODER_INIT_STATUS_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER;
 690
 691         if(encoder->protected_->qlp_coeff_precision == 0) {
 692                 if(encoder->protected_->bits_per_sample < 16) {
 693                         /* @@@ need some data about how to set this here w.r.t. blocksize and sample rate */
 694                         /* @@@ until then we'll make a guess */
 695                         encoder->protected_->qlp_coeff_precision = max(FLAC__MIN_QLP_COEFF_PRECISION, 2 + encoder->protected_->bits_per_sample / 2);
 696                 }
 697                 else if(encoder->protected_->bits_per_sample == 16) {
 698                         if(encoder->protected_->blocksize <= 192)
 699                                 encoder->protected_->qlp_coeff_precision = 7;
 700                         else if(encoder->protected_->blocksize <= 384)
 701                                 encoder->protected_->qlp_coeff_precision = 8;
 702                         else if(encoder->protected_->blocksize <= 576)
 703                                 encoder->protected_->qlp_coeff_precision = 9;
 704                         else if(encoder->protected_->blocksize <= 1152)
 705                                 encoder->protected_->qlp_coeff_precision = 10;
 706                         else if(encoder->protected_->blocksize <= 2304)
 707                                 encoder->protected_->qlp_coeff_precision = 11;
 708                         else if(encoder->protected_->blocksize <= 4608)
 709                                 encoder->protected_->qlp_coeff_precision = 12;
 710                         else
 711                                 encoder->protected_->qlp_coeff_precision = 13;
 712                 }
 713                 else {
 714                         if(encoder->protected_->blocksize <= 384)
 715                                 encoder->protected_->qlp_coeff_precision = FLAC__MAX_QLP_COEFF_PRECISION-2;
 716                         else if(encoder->protected_->blocksize <= 1152)
 717                                 encoder->protected_->qlp_coeff_precision = FLAC__MAX_QLP_COEFF_PRECISION-1;
 718                         else
 719                                 encoder->protected_->qlp_coeff_precision = FLAC__MAX_QLP_COEFF_PRECISION;
 720                 }
 721                 FLAC__ASSERT(encoder->protected_->qlp_coeff_precision <= FLAC__MAX_QLP_COEFF_PRECISION);
 722         }
 723         else if(encoder->protected_->qlp_coeff_precision < FLAC__MIN_QLP_COEFF_PRECISION || encoder->protected_->qlp_coeff_precision > FLAC__MAX_QLP_COEFF_PRECISION)
 724                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_QLP_COEFF_PRECISION;
 725
 726         if(encoder->protected_->streamable_subset) {
 727                 if(
 728                         encoder->protected_->blocksize != 192 &&
 729                         encoder->protected_->blocksize != 576 &&
 730                         encoder->protected_->blocksize != 1152 &&
 731                         encoder->protected_->blocksize != 2304 &&
 732                         encoder->protected_->blocksize != 4608 &&
 733                         encoder->protected_->blocksize != 256 &&
 734                         encoder->protected_->blocksize != 512 &&
 735                         encoder->protected_->blocksize != 1024 &&
 736                         encoder->protected_->blocksize != 2048 &&
 737                         encoder->protected_->blocksize != 4096 &&
 738                         encoder->protected_->blocksize != 8192 &&
 739                         encoder->protected_->blocksize != 16384
 740                 )
 741                         return FLAC__STREAM_ENCODER_INIT_STATUS_NOT_STREAMABLE;
 742                 if(
 743                         encoder->protected_->sample_rate != 8000 &&
 744                         encoder->protected_->sample_rate != 16000 &&
 745                         encoder->protected_->sample_rate != 22050 &&
 746                         encoder->protected_->sample_rate != 24000 &&
 747                         encoder->protected_->sample_rate != 32000 &&
 748                         encoder->protected_->sample_rate != 44100 &&
 749                         encoder->protected_->sample_rate != 48000 &&
 750                         encoder->protected_->sample_rate != 96000
 751                 )
 752                         return FLAC__STREAM_ENCODER_INIT_STATUS_NOT_STREAMABLE;
 753                 if(
 754                         encoder->protected_->bits_per_sample != 8 &&
 755                         encoder->protected_->bits_per_sample != 12 &&
 756                         encoder->protected_->bits_per_sample != 16 &&
 757                         encoder->protected_->bits_per_sample != 20 &&
 758                         encoder->protected_->bits_per_sample != 24
 759                 )
 760                         return FLAC__STREAM_ENCODER_INIT_STATUS_NOT_STREAMABLE;
 761                 if(encoder->protected_->max_residual_partition_order > FLAC__SUBSET_MAX_RICE_PARTITION_ORDER)
 762                         return FLAC__STREAM_ENCODER_INIT_STATUS_NOT_STREAMABLE;
 763                 if(
 764                         encoder->protected_->sample_rate <= 48000 &&
 765                         (
 766                                 encoder->protected_->blocksize > FLAC__SUBSET_MAX_BLOCK_SIZE_48000HZ ||
 767                                 encoder->protected_->max_lpc_order > FLAC__SUBSET_MAX_LPC_ORDER_48000HZ
 768                         )
 769                 ) {
 770                         return FLAC__STREAM_ENCODER_INIT_STATUS_NOT_STREAMABLE;
 771                 }
 772         }
 773
 774         if(encoder->protected_->max_residual_partition_order >= (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
 775                 encoder->protected_->max_residual_partition_order = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN) - 1;
 776         if(encoder->protected_->min_residual_partition_order >= encoder->protected_->max_residual_partition_order)
 777                 encoder->protected_->min_residual_partition_order = encoder->protected_->max_residual_partition_order;
 778
 779 #if FLAC__HAS_OGG
 780         /* reorder metadata if necessary to ensure that any VORBIS_COMMENT is the first, according to the mapping spec */
 781         if(is_ogg && 0 != encoder->protected_->metadata && encoder->protected_->num_metadata_blocks > 1) {
 782                 unsigned i;
 783                 for(i = 1; i < encoder->protected_->num_metadata_blocks; i++) {
 784                         if(0 != encoder->protected_->metadata[i] && encoder->protected_->metadata[i]->type == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
 785                                 FLAC__StreamMetadata *vc = encoder->protected_->metadata[i];
 786                                 for( ; i > 0; i--)
 787                                         encoder->protected_->metadata[i] = encoder->protected_->metadata[i-1];
 788                                 encoder->protected_->metadata[0] = vc;
 789                                 break;
 790                         }
 791                 }
 792         }
 793 #endif
 794         /* keep track of any SEEKTABLE block */
 795         if(0 != encoder->protected_->metadata && encoder->protected_->num_metadata_blocks > 0) {
 796                 unsigned i;
 797                 for(i = 0; i < encoder->protected_->num_metadata_blocks; i++) {
 798                         if(0 != encoder->protected_->metadata[i] && encoder->protected_->metadata[i]->type == FLAC__METADATA_TYPE_SEEKTABLE) {
 799                                 encoder->private_->seek_table = &encoder->protected_->metadata[i]->data.seek_table;
 800                                 break; /* take only the first one */
 801                         }
 802                 }
 803         }
 804
 805         /* validate metadata */
 806         if(0 == encoder->protected_->metadata && encoder->protected_->num_metadata_blocks > 0)
 807                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA;
 808         metadata_has_seektable = false;
 809         metadata_has_vorbis_comment = false;
 810         metadata_picture_has_type1 = false;
 811         metadata_picture_has_type2 = false;
 812         for(i = 0; i < encoder->protected_->num_metadata_blocks; i++) {
 813                 const FLAC__StreamMetadata *m = encoder->protected_->metadata[i];
 814                 if(m->type == FLAC__METADATA_TYPE_STREAMINFO)
 815                         return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA;
 816                 else if(m->type == FLAC__METADATA_TYPE_SEEKTABLE) {
 817                         if(metadata_has_seektable) /* only one is allowed */
 818                                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA;
 819                         metadata_has_seektable = true;
 820                         if(!FLAC__format_seektable_is_legal(&m->data.seek_table))
 821                                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA;
 822                 }
 823                 else if(m->type == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
 824                         if(metadata_has_vorbis_comment) /* only one is allowed */
 825                                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA;
 826                         metadata_has_vorbis_comment = true;
 827                 }
 828                 else if(m->type == FLAC__METADATA_TYPE_CUESHEET) {
 829                         if(!FLAC__format_cuesheet_is_legal(&m->data.cue_sheet, m->data.cue_sheet.is_cd, /*violation=*/0))
 830                                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA;
 831                 }
 832                 else if(m->type == FLAC__METADATA_TYPE_PICTURE) {
 833                         if(!FLAC__format_picture_is_legal(&m->data.picture, /*violation=*/0))
 834                                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA;
 835                         if(m->data.picture.type == FLAC__STREAM_METADATA_PICTURE_TYPE_FILE_ICON_STANDARD) {
 836                                 if(metadata_picture_has_type1) /* there should only be 1 per stream */
 837                                         return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA;
 838                                 metadata_picture_has_type1 = true;
 839                                 /* standard icon must be 32x32 pixel PNG */
 840                                 if(
 841                                         m->data.picture.type == FLAC__STREAM_METADATA_PICTURE_TYPE_FILE_ICON_STANDARD &&
 842                                         (
 843                                                 (strcmp(m->data.picture.mime_type, "image/png") && strcmp(m->data.picture.mime_type, "-->")) ||
 844                                                 m->data.picture.width != 32 ||
 845                                                 m->data.picture.height != 32
 846                                         )
 847                                 )
 848                                         return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA;
 849                         }
 850                         else if(m->data.picture.type == FLAC__STREAM_METADATA_PICTURE_TYPE_FILE_ICON) {
 851                                 if(metadata_picture_has_type2) /* there should only be 1 per stream */
 852                                         return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA;
 853                                 metadata_picture_has_type2 = true;
 854                         }
 855                 }
 856         }
 857
 858         encoder->private_->input_capacity = 0;
 859         for(i = 0; i < encoder->protected_->channels; i++) {
 860                 encoder->private_->integer_signal_unaligned[i] = encoder->private_->integer_signal[i] = 0;
 861 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 862                 encoder->private_->real_signal_unaligned[i] = encoder->private_->real_signal[i] = 0;
 863 #endif
 864         }
 865         for(i = 0; i < 2; i++) {
 866                 encoder->private_->integer_signal_mid_side_unaligned[i] = encoder->private_->integer_signal_mid_side[i] = 0;
 867 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 868                 encoder->private_->real_signal_mid_side_unaligned[i] = encoder->private_->real_signal_mid_side[i] = 0;
 869 #endif
 870         }
 871 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 872         for(i = 0; i < encoder->protected_->num_apodizations; i++)
 873                 encoder->private_->window_unaligned[i] = encoder->private_->window[i] = 0;
 874         encoder->private_->windowed_signal_unaligned = encoder->private_->windowed_signal = 0;
 875 #endif
 876         for(i = 0; i < encoder->protected_->channels; i++) {
 877                 encoder->private_->residual_workspace_unaligned[i][0] = encoder->private_->residual_workspace[i][0] = 0;
 878                 encoder->private_->residual_workspace_unaligned[i][1] = encoder->private_->residual_workspace[i][1] = 0;
 879                 encoder->private_->best_subframe[i] = 0;
 880         }
 881         for(i = 0; i < 2; i++) {
 882                 encoder->private_->residual_workspace_mid_side_unaligned[i][0] = encoder->private_->residual_workspace_mid_side[i][0] = 0;
 883                 encoder->private_->residual_workspace_mid_side_unaligned[i][1] = encoder->private_->residual_workspace_mid_side[i][1] = 0;
 884                 encoder->private_->best_subframe_mid_side[i] = 0;
 885         }
 886         encoder->private_->abs_residual_partition_sums_unaligned = encoder->private_->abs_residual_partition_sums = 0;
 887         encoder->private_->raw_bits_per_partition_unaligned = encoder->private_->raw_bits_per_partition = 0;
 888 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 889         encoder->private_->loose_mid_side_stereo_frames = (unsigned)((FLAC__double)encoder->protected_->sample_rate * 0.4 / (FLAC__double)encoder->protected_->blocksize + 0.5);
 890 #else
 891         /* 26214 is the approximate fixed-point equivalent to 0.4 (0.4 * 2^16) */
 892         /* sample rate can be up to 655350 Hz, and thus use 20 bits, so we do the multiply&divide by hand */
 893         FLAC__ASSERT(FLAC__MAX_SAMPLE_RATE <= 655350);
 894         FLAC__ASSERT(FLAC__MAX_BLOCK_SIZE <= 65535);
 895         FLAC__ASSERT(encoder->protected_->sample_rate <= 655350);
 896         FLAC__ASSERT(encoder->protected_->blocksize <= 65535);
 897         encoder->private_->loose_mid_side_stereo_frames = (unsigned)FLAC__fixedpoint_trunc((((FLAC__uint64)(encoder->protected_->sample_rate) * (FLAC__uint64)(26214)) << 16) / (encoder->protected_->blocksize<<16) + FLAC__FP_ONE_HALF);
 898 #endif
 899         if(encoder->private_->loose_mid_side_stereo_frames == 0)
 900                 encoder->private_->loose_mid_side_stereo_frames = 1;
 901         encoder->private_->loose_mid_side_stereo_frame_count = 0;
 902         encoder->private_->current_sample_number = 0;
 903         encoder->private_->current_frame_number = 0;
 904
 905         encoder->private_->use_wide_by_block = (encoder->protected_->bits_per_sample + FLAC__bitmath_ilog2(encoder->protected_->blocksize)+1 > 30);
 906         encoder->private_->use_wide_by_order = (encoder->protected_->bits_per_sample + FLAC__bitmath_ilog2(max(encoder->protected_->max_lpc_order, FLAC__MAX_FIXED_ORDER))+1 > 30); /*@@@ need to use this? */
 907         encoder->private_->use_wide_by_partition = (false); /*@@@ need to set this */
 908
 909         /*
 910          * get the CPU info and set the function pointers
 911          */
 912         FLAC__cpu_info(&encoder->private_->cpuinfo);
 913         /* first default to the non-asm routines */
 914 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 915         encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation;
 916 #endif
 917         encoder->private_->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor;
 918 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 919         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients;
 920         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_64bit = FLAC__lpc_compute_residual_from_qlp_coefficients_wide;
 921         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients;
 922 #endif
 923         /* now override with asm where appropriate */
 924 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 925 # ifndef FLAC__NO_ASM
 926         if(encoder->private_->cpuinfo.use_asm) {
 927 #  ifdef FLAC__CPU_IA32
 928                 FLAC__ASSERT(encoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
 929 #   ifdef FLAC__HAS_NASM
 930                 if(encoder->private_->cpuinfo.data.ia32.sse) {
 931                         if(encoder->protected_->max_lpc_order < 4)
 932                                 encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_4;
 933                         else if(encoder->protected_->max_lpc_order < 8)
 934                                 encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_8;
 935                         else if(encoder->protected_->max_lpc_order < 12)
 936                                 encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_12;
 937                         else
 938                                 encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32;
 939                 }
 940                 else if(encoder->private_->cpuinfo.data.ia32._3dnow)
 941                         encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_3dnow;
 942                 else
 943                         encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32;
 944                 if(encoder->private_->cpuinfo.data.ia32.mmx) {
 945                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
 946                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32_mmx;
 947                 }
 948                 else {
 949                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
 950                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
 951                 }
 952                 if(encoder->private_->cpuinfo.data.ia32.mmx && encoder->private_->cpuinfo.data.ia32.cmov)
 953                         encoder->private_->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor_asm_ia32_mmx_cmov;
 954 #   endif /* FLAC__HAS_NASM */
 955 #  endif /* FLAC__CPU_IA32 */
 956         }
 957 # endif /* !FLAC__NO_ASM */
 958 #endif /* !FLAC__INTEGER_ONLY_LIBRARY */
 959         /* finally override based on wide-ness if necessary */
 960         if(encoder->private_->use_wide_by_block) {
 961                 encoder->private_->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor_wide;
 962         }
 963
 964         /* set state to OK; from here on, errors are fatal and we'll override the state then */
 965         encoder->protected_->state = FLAC__STREAM_ENCODER_OK;
 966
 967 #if FLAC__HAS_OGG
 968         encoder->private_->is_ogg = is_ogg;
 969         if(is_ogg && !FLAC__ogg_encoder_aspect_init(&encoder->protected_->ogg_encoder_aspect)) {
 970                 encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
 971                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
 972         }
 973 #endif
 974
 975         encoder->private_->read_callback = read_callback;
 976         encoder->private_->write_callback = write_callback;
 977         encoder->private_->seek_callback = seek_callback;
 978         encoder->private_->tell_callback = tell_callback;
 979         encoder->private_->metadata_callback = metadata_callback;
 980         encoder->private_->client_data = client_data;
 981
 982         if(!resize_buffers_(encoder, encoder->protected_->blocksize)) {
 983                 /* the above function sets the state for us in case of an error */
 984                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
 985         }
 986
 987         if(!FLAC__bitwriter_init(encoder->private_->frame)) {
 988                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
 989                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
 990         }
 991
 992         /*
 993          * Set up the verify stuff if necessary
 994          */
 995         if(encoder->protected_->verify) {
 996                 /*
 997                  * First, set up the fifo which will hold the
 998                  * original signal to compare against
 999                  */
1000                 encoder->private_->verify.input_fifo.size = encoder->protected_->blocksize+OVERREAD_;
1001                 for(i = 0; i < encoder->protected_->channels; i++) {
1002                         if(0 == (encoder->private_->verify.input_fifo.data[i] = (FLAC__int32*)malloc(sizeof(FLAC__int32) * encoder->private_->verify.input_fifo.size))) {
1003                                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
1004                                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1005                         }
1006                 }
1007                 encoder->private_->verify.input_fifo.tail = 0;
1008
1009                 /*
1010                  * Now set up a stream decoder for verification
1011                  */
1012                 encoder->private_->verify.decoder = FLAC__stream_decoder_new();
1013                 if(0 == encoder->private_->verify.decoder) {
1014                         encoder->protected_->state = FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR;
1015                         return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1016                 }
1017
1018                 if(FLAC__stream_decoder_init_stream(encoder->private_->verify.decoder, verify_read_callback_, /*seek_callback=*/0, /*tell_callback=*/0, /*length_callback=*/0, /*eof_callback=*/0, verify_write_callback_, verify_metadata_callback_, verify_error_callback_, /*client_data=*/encoder) != FLAC__STREAM_DECODER_INIT_STATUS_OK) {
1019                         encoder->protected_->state = FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR;
1020                         return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1021                 }
1022         }
1023         encoder->private_->verify.error_stats.absolute_sample = 0;
1024         encoder->private_->verify.error_stats.frame_number = 0;
1025         encoder->private_->verify.error_stats.channel = 0;
1026         encoder->private_->verify.error_stats.sample = 0;
1027         encoder->private_->verify.error_stats.expected = 0;
1028         encoder->private_->verify.error_stats.got = 0;
1029
1030         /*
1031          * These must be done before we write any metadata, because that
1032          * calls the write_callback, which uses these values.
1033          */
1034         encoder->private_->first_seekpoint_to_check = 0;
1035         encoder->private_->samples_written = 0;
1036         encoder->protected_->streaminfo_offset = 0;
1037         encoder->protected_->seektable_offset = 0;
1038         encoder->protected_->audio_offset = 0;
1039
1040         /*
1041          * write the stream header
1042          */
1043         if(encoder->protected_->verify)
1044                 encoder->private_->verify.state_hint = ENCODER_IN_MAGIC;
1045         if(!FLAC__bitwriter_write_raw_uint32(encoder->private_->frame, FLAC__STREAM_SYNC, FLAC__STREAM_SYNC_LEN)) {
1046                 encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
1047                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1048         }
1049         if(!write_bitbuffer_(encoder, 0, /*is_last_block=*/false)) {
1050                 /* the above function sets the state for us in case of an error */
1051                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1052         }
1053
1054         /*
1055          * write the STREAMINFO metadata block
1056          */
1057         if(encoder->protected_->verify)
1058                 encoder->private_->verify.state_hint = ENCODER_IN_METADATA;
1059         encoder->private_->streaminfo.type = FLAC__METADATA_TYPE_STREAMINFO;
1060         encoder->private_->streaminfo.is_last = false; /* we will have at a minimum a VORBIS_COMMENT afterwards */
1061         encoder->private_->streaminfo.length = FLAC__STREAM_METADATA_STREAMINFO_LENGTH;
1062         encoder->private_->streaminfo.data.stream_info.min_blocksize = encoder->protected_->blocksize; /* this encoder uses the same blocksize for the whole stream */
1063         encoder->private_->streaminfo.data.stream_info.max_blocksize = encoder->protected_->blocksize;
1064         encoder->private_->streaminfo.data.stream_info.min_framesize = 0; /* we don't know this yet; have to fill it in later */
1065         encoder->private_->streaminfo.data.stream_info.max_framesize = 0; /* we don't know this yet; have to fill it in later */
1066         encoder->private_->streaminfo.data.stream_info.sample_rate = encoder->protected_->sample_rate;
1067         encoder->private_->streaminfo.data.stream_info.channels = encoder->protected_->channels;
1068         encoder->private_->streaminfo.data.stream_info.bits_per_sample = encoder->protected_->bits_per_sample;
1069         encoder->private_->streaminfo.data.stream_info.total_samples = encoder->protected_->total_samples_estimate; /* we will replace this later with the real total */
1070         memset(encoder->private_->streaminfo.data.stream_info.md5sum, 0, 16); /* we don't know this yet; have to fill it in later */
1071         FLAC__MD5Init(&encoder->private_->md5context);
1072         if(!FLAC__add_metadata_block(&encoder->private_->streaminfo, encoder->private_->frame)) {
1073                 encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
1074                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1075         }
1076         if(!write_bitbuffer_(encoder, 0, /*is_last_block=*/false)) {
1077                 /* the above function sets the state for us in case of an error */
1078                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1079         }
1080
1081         /*
1082          * Now that the STREAMINFO block is written, we can init this to an
1083          * absurdly-high value...
1084          */
1085         encoder->private_->streaminfo.data.stream_info.min_framesize = (1u << FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN) - 1;
1086         /* ... and clear this to 0 */
1087         encoder->private_->streaminfo.data.stream_info.total_samples = 0;
1088
1089         /*
1090          * Check to see if the supplied metadata contains a VORBIS_COMMENT;
1091          * if not, we will write an empty one (FLAC__add_metadata_block()
1092          * automatically supplies the vendor string).
1093          *
1094          * WATCHOUT: the Ogg FLAC mapping requires us to write this block after
1095          * the STREAMINFO.  (In the case that metadata_has_vorbis_comment is
1096          * true it will have already insured that the metadata list is properly
1097          * ordered.)
1098          */
1099         if(!metadata_has_vorbis_comment) {
1100                 FLAC__StreamMetadata vorbis_comment;
1101                 vorbis_comment.type = FLAC__METADATA_TYPE_VORBIS_COMMENT;
1102                 vorbis_comment.is_last = (encoder->protected_->num_metadata_blocks == 0);
1103                 vorbis_comment.length = 4 + 4; /* MAGIC NUMBER */
1104                 vorbis_comment.data.vorbis_comment.vendor_string.length = 0;
1105                 vorbis_comment.data.vorbis_comment.vendor_string.entry = 0;
1106                 vorbis_comment.data.vorbis_comment.num_comments = 0;
1107                 vorbis_comment.data.vorbis_comment.comments = 0;
1108                 if(!FLAC__add_metadata_block(&vorbis_comment, encoder->private_->frame)) {
1109                         encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
1110                         return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1111                 }
1112                 if(!write_bitbuffer_(encoder, 0, /*is_last_block=*/false)) {
1113                         /* the above function sets the state for us in case of an error */
1114                         return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1115                 }
1116         }
1117
1118         /*
1119          * write the user's metadata blocks
1120          */
1121         for(i = 0; i < encoder->protected_->num_metadata_blocks; i++) {
1122                 encoder->protected_->metadata[i]->is_last = (i == encoder->protected_->num_metadata_blocks - 1);
1123                 if(!FLAC__add_metadata_block(encoder->protected_->metadata[i], encoder->private_->frame)) {
1124                         encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
1125                         return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1126                 }
1127                 if(!write_bitbuffer_(encoder, 0, /*is_last_block=*/false)) {
1128                         /* the above function sets the state for us in case of an error */
1129                         return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1130                 }
1131         }
1132
1133         /* now that all the metadata is written, we save the stream offset */
1134         if(encoder->private_->tell_callback && encoder->private_->tell_callback(encoder, &encoder->protected_->audio_offset, encoder->private_->client_data) == FLAC__STREAM_ENCODER_TELL_STATUS_ERROR) { /* FLAC__STREAM_ENCODER_TELL_STATUS_UNSUPPORTED just means we didn't get the offset; no error */
1135                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
1136                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1137         }
1138
1139         if(encoder->protected_->verify)
1140                 encoder->private_->verify.state_hint = ENCODER_IN_AUDIO;
1141
1142         return FLAC__STREAM_ENCODER_INIT_STATUS_OK;
1143 }
1144
1145 FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_stream(
1146         FLAC__StreamEncoder *encoder,
1147         FLAC__StreamEncoderWriteCallback write_callback,
1148         FLAC__StreamEncoderSeekCallback seek_callback,
1149         FLAC__StreamEncoderTellCallback tell_callback,
1150         FLAC__StreamEncoderMetadataCallback metadata_callback,
1151         void *client_data
1152 )
1153 {
1154         return init_stream_internal_(
1155                 encoder,
1156                 /*read_callback=*/0,
1157                 write_callback,
1158                 seek_callback,
1159                 tell_callback,
1160                 metadata_callback,
1161                 client_data,
1162                 /*is_ogg=*/false
1163         );
1164 }
1165
1166 FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_ogg_stream(
1167         FLAC__StreamEncoder *encoder,
1168         FLAC__StreamEncoderReadCallback read_callback,
1169         FLAC__StreamEncoderWriteCallback write_callback,
1170         FLAC__StreamEncoderSeekCallback seek_callback,
1171         FLAC__StreamEncoderTellCallback tell_callback,
1172         FLAC__StreamEncoderMetadataCallback metadata_callback,
1173         void *client_data
1174 )
1175 {
1176         return init_stream_internal_(
1177                 encoder,
1178                 read_callback,
1179                 write_callback,
1180                 seek_callback,
1181                 tell_callback,
1182                 metadata_callback,
1183                 client_data,
1184                 /*is_ogg=*/true
1185         );
1186 }
1187
1188 static FLAC__StreamEncoderInitStatus init_FILE_internal_(
1189         FLAC__StreamEncoder *encoder,
1190         FILE *file,
1191         FLAC__StreamEncoderProgressCallback progress_callback,
1192         void *client_data,
1193         FLAC__bool is_ogg
1194 )
1195 {
1196         FLAC__StreamEncoderInitStatus init_status;
1197
1198         FLAC__ASSERT(0 != encoder);
1199         FLAC__ASSERT(0 != file);
1200
1201         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1202                 return FLAC__STREAM_ENCODER_INIT_STATUS_ALREADY_INITIALIZED;
1203
1204         /* double protection */
1205         if(file == 0) {
1206                 encoder->protected_->state = FLAC__STREAM_ENCODER_IO_ERROR;
1207                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1208         }
1209
1210         /*
1211          * To make sure that our file does not go unclosed after an error, we
1212          * must assign the FILE pointer before any further error can occur in
1213          * this routine.
1214          */
1215         if(file == stdout)
1216                 file = get_binary_stdout_(); /* just to be safe */
1217
1218         encoder->private_->file = file;
1219
1220         encoder->private_->progress_callback = progress_callback;
1221         encoder->private_->bytes_written = 0;
1222         encoder->private_->samples_written = 0;
1223         encoder->private_->frames_written = 0;
1224
1225         init_status = init_stream_internal_(
1226                 encoder,
1227                 encoder->private_->file == stdout? 0 : is_ogg? file_read_callback_ : 0,
1228                 file_write_callback_,
1229                 encoder->private_->file == stdout? 0 : file_seek_callback_,
1230                 encoder->private_->file == stdout? 0 : file_tell_callback_,
1231                 /*metadata_callback=*/0,
1232                 client_data,
1233                 is_ogg
1234         );
1235         if(init_status != FLAC__STREAM_ENCODER_INIT_STATUS_OK) {
1236                 /* the above function sets the state for us in case of an error */
1237                 return init_status;
1238         }
1239
1240         {
1241                 unsigned blocksize = FLAC__stream_encoder_get_blocksize(encoder);
1242
1243                 FLAC__ASSERT(blocksize != 0);
1244                 encoder->private_->total_frames_estimate = (unsigned)((FLAC__stream_encoder_get_total_samples_estimate(encoder) + blocksize - 1) / blocksize);
1245         }
1246
1247         return init_status;
1248 }
1249
1250 FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_FILE(
1251         FLAC__StreamEncoder *encoder,
1252         FILE *file,
1253         FLAC__StreamEncoderProgressCallback progress_callback,
1254         void *client_data
1255 )
1256 {
1257         return init_FILE_internal_(encoder, file, progress_callback, client_data, /*is_ogg=*/false);
1258 }
1259
1260 FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_ogg_FILE(
1261         FLAC__StreamEncoder *encoder,
1262         FILE *file,
1263         FLAC__StreamEncoderProgressCallback progress_callback,
1264         void *client_data
1265 )
1266 {
1267         return init_FILE_internal_(encoder, file, progress_callback, client_data, /*is_ogg=*/true);
1268 }
1269
1270 static FLAC__StreamEncoderInitStatus init_file_internal_(
1271         FLAC__StreamEncoder *encoder,
1272         const char *filename,
1273         FLAC__StreamEncoderProgressCallback progress_callback,
1274         void *client_data,
1275         FLAC__bool is_ogg
1276 )
1277 {
1278         FILE *file;
1279
1280         FLAC__ASSERT(0 != encoder);
1281
1282         /*
1283          * To make sure that our file does not go unclosed after an error, we
1284          * have to do the same entrance checks here that are later performed
1285          * in FLAC__stream_encoder_init_FILE() before the FILE* is assigned.
1286          */
1287         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1288                 return FLAC__STREAM_ENCODER_INIT_STATUS_ALREADY_INITIALIZED;
1289
1290         file = filename? fopen(filename, "w+b") : stdout;
1291
1292         if(file == 0) {
1293                 encoder->protected_->state = FLAC__STREAM_ENCODER_IO_ERROR;
1294                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1295         }
1296
1297         return init_FILE_internal_(encoder, file, progress_callback, client_data, is_ogg);
1298 }
1299
1300 FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_file(
1301         FLAC__StreamEncoder *encoder,
1302         const char *filename,
1303         FLAC__StreamEncoderProgressCallback progress_callback,
1304         void *client_data
1305 )
1306 {
1307         return init_file_internal_(encoder, filename, progress_callback, client_data, /*is_ogg=*/false);
1308 }
1309
1310 FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_ogg_file(
1311         FLAC__StreamEncoder *encoder,
1312         const char *filename,
1313         FLAC__StreamEncoderProgressCallback progress_callback,
1314         void *client_data
1315 )
1316 {
1317         return init_file_internal_(encoder, filename, progress_callback, client_data, /*is_ogg=*/true);
1318 }
1319
1320 FLAC_API FLAC__bool FLAC__stream_encoder_finish(FLAC__StreamEncoder *encoder)
1321 {
1322         FLAC__bool error = false;
1323
1324         FLAC__ASSERT(0 != encoder);
1325         FLAC__ASSERT(0 != encoder->private_);
1326         FLAC__ASSERT(0 != encoder->protected_);
1327
1328         if(encoder->protected_->state == FLAC__STREAM_ENCODER_UNINITIALIZED)
1329                 return true;
1330
1331         if(encoder->protected_->state == FLAC__STREAM_ENCODER_OK && !encoder->private_->is_being_deleted) {
1332                 if(encoder->private_->current_sample_number != 0) {
1333                         const FLAC__bool is_fractional_block = encoder->protected_->blocksize != encoder->private_->current_sample_number;
1334                         encoder->protected_->blocksize = encoder->private_->current_sample_number;
1335                         if(!process_frame_(encoder, is_fractional_block, /*is_last_block=*/true))
1336                                 error = true;
1337                 }
1338         }
1339
1340         FLAC__MD5Final(encoder->private_->streaminfo.data.stream_info.md5sum, &encoder->private_->md5context);
1341
1342         if(!encoder->private_->is_being_deleted) {
1343                 if(encoder->protected_->state == FLAC__STREAM_ENCODER_OK) {
1344                         if(encoder->private_->seek_callback) {
1345 #if FLAC__HAS_OGG
1346                                 if(encoder->private_->is_ogg)
1347                                         update_ogg_metadata_(encoder);
1348                                 else
1349 #endif
1350                                 update_metadata_(encoder);
1351
1352                                 /* check if an error occurred while updating metadata */
1353                                 if(encoder->protected_->state != FLAC__STREAM_ENCODER_OK)
1354                                         error = true;
1355                         }
1356                         if(encoder->private_->metadata_callback)
1357                                 encoder->private_->metadata_callback(encoder, &encoder->private_->streaminfo, encoder->private_->client_data);
1358                 }
1359
1360                 if(encoder->protected_->verify && 0 != encoder->private_->verify.decoder && !FLAC__stream_decoder_finish(encoder->private_->verify.decoder)) {
1361                         if(!error)
1362                                 encoder->protected_->state = FLAC__STREAM_ENCODER_VERIFY_MISMATCH_IN_AUDIO_DATA;
1363                         error = true;
1364                 }
1365         }
1366
1367         if(0 != encoder->private_->file) {
1368                 if(encoder->private_->file != stdout)
1369                         fclose(encoder->private_->file);
1370                 encoder->private_->file = 0;
1371         }
1372
1373 #if FLAC__HAS_OGG
1374         if(encoder->private_->is_ogg)
1375                 FLAC__ogg_encoder_aspect_finish(&encoder->protected_->ogg_encoder_aspect);
1376 #endif
1377
1378         free_(encoder);
1379         set_defaults_(encoder);
1380
1381         if(!error)
1382                 encoder->protected_->state = FLAC__STREAM_ENCODER_UNINITIALIZED;
1383
1384         return !error;
1385 }
1386
1387 FLAC_API FLAC__bool FLAC__stream_encoder_set_ogg_serial_number(FLAC__StreamEncoder *encoder, long value)
1388 {
1389         FLAC__ASSERT(0 != encoder);
1390         FLAC__ASSERT(0 != encoder->private_);
1391         FLAC__ASSERT(0 != encoder->protected_);
1392         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1393                 return false;
1394 #if FLAC__HAS_OGG
1395         /* can't check encoder->private_->is_ogg since that's not set until init time */
1396         FLAC__ogg_encoder_aspect_set_serial_number(&encoder->protected_->ogg_encoder_aspect, value);
1397         return true;
1398 #else
1399         (void)value;
1400         return false;
1401 #endif
1402 }
1403
1404 FLAC_API FLAC__bool FLAC__stream_encoder_set_verify(FLAC__StreamEncoder *encoder, FLAC__bool value)
1405 {
1406         FLAC__ASSERT(0 != encoder);
1407         FLAC__ASSERT(0 != encoder->private_);
1408         FLAC__ASSERT(0 != encoder->protected_);
1409         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1410                 return false;
1411 #ifndef FLAC__MANDATORY_VERIFY_WHILE_ENCODING
1412         encoder->protected_->verify = value;
1413 #endif
1414         return true;
1415 }
1416
1417 FLAC_API FLAC__bool FLAC__stream_encoder_set_streamable_subset(FLAC__StreamEncoder *encoder, FLAC__bool value)
1418 {
1419         FLAC__ASSERT(0 != encoder);
1420         FLAC__ASSERT(0 != encoder->private_);
1421         FLAC__ASSERT(0 != encoder->protected_);
1422         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1423                 return false;
1424         encoder->protected_->streamable_subset = value;
1425         return true;
1426 }
1427
1428 FLAC_API FLAC__bool FLAC__stream_encoder_set_channels(FLAC__StreamEncoder *encoder, unsigned value)
1429 {
1430         FLAC__ASSERT(0 != encoder);
1431         FLAC__ASSERT(0 != encoder->private_);
1432         FLAC__ASSERT(0 != encoder->protected_);
1433         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1434                 return false;
1435         encoder->protected_->channels = value;
1436         return true;
1437 }
1438
1439 FLAC_API FLAC__bool FLAC__stream_encoder_set_bits_per_sample(FLAC__StreamEncoder *encoder, unsigned value)
1440 {
1441         FLAC__ASSERT(0 != encoder);
1442         FLAC__ASSERT(0 != encoder->private_);
1443         FLAC__ASSERT(0 != encoder->protected_);
1444         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1445                 return false;
1446         encoder->protected_->bits_per_sample = value;
1447         return true;
1448 }
1449
1450 FLAC_API FLAC__bool FLAC__stream_encoder_set_sample_rate(FLAC__StreamEncoder *encoder, unsigned value)
1451 {
1452         FLAC__ASSERT(0 != encoder);
1453         FLAC__ASSERT(0 != encoder->private_);
1454         FLAC__ASSERT(0 != encoder->protected_);
1455         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1456                 return false;
1457         encoder->protected_->sample_rate = value;
1458         return true;
1459 }
1460
1461 FLAC_API FLAC__bool FLAC__stream_encoder_set_compression_level(FLAC__StreamEncoder *encoder, unsigned value)
1462 {
1463         FLAC__bool ok = true;
1464         FLAC__ASSERT(0 != encoder);
1465         FLAC__ASSERT(0 != encoder->private_);
1466         FLAC__ASSERT(0 != encoder->protected_);
1467         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1468                 return false;
1469         if(value >= sizeof(compression_levels_)/sizeof(compression_levels_[0]))
1470                 value = sizeof(compression_levels_)/sizeof(compression_levels_[0]) - 1;
1471         ok &= FLAC__stream_encoder_set_do_mid_side_stereo          (encoder, compression_levels_[value].do_mid_side_stereo);
1472         ok &= FLAC__stream_encoder_set_loose_mid_side_stereo       (encoder, compression_levels_[value].loose_mid_side_stereo);
1473 #if 0
1474         /* was: */
1475         ok &= FLAC__stream_encoder_set_apodization                 (encoder, compression_levels_[value].apodization);
1476         /* but it's too hard to specify the string in a locale-specific way */
1477 #else
1478         encoder->protected_->num_apodizations = 1;
1479         encoder->protected_->apodizations[0].type = FLAC__APODIZATION_TUKEY;
1480         encoder->protected_->apodizations[0].parameters.tukey.p = 0.5;
1481 #endif
1482         ok &= FLAC__stream_encoder_set_max_lpc_order               (encoder, compression_levels_[value].max_lpc_order);
1483         ok &= FLAC__stream_encoder_set_qlp_coeff_precision         (encoder, compression_levels_[value].qlp_coeff_precision);
1484         ok &= FLAC__stream_encoder_set_do_qlp_coeff_prec_search    (encoder, compression_levels_[value].do_qlp_coeff_prec_search);
1485         ok &= FLAC__stream_encoder_set_do_escape_coding            (encoder, compression_levels_[value].do_escape_coding);
1486         ok &= FLAC__stream_encoder_set_do_exhaustive_model_search  (encoder, compression_levels_[value].do_exhaustive_model_search);
1487         ok &= FLAC__stream_encoder_set_min_residual_partition_order(encoder, compression_levels_[value].min_residual_partition_order);
1488         ok &= FLAC__stream_encoder_set_max_residual_partition_order(encoder, compression_levels_[value].max_residual_partition_order);
1489         ok &= FLAC__stream_encoder_set_rice_parameter_search_dist  (encoder, compression_levels_[value].rice_parameter_search_dist);
1490         return ok;
1491 }
1492
1493 FLAC_API FLAC__bool FLAC__stream_encoder_set_blocksize(FLAC__StreamEncoder *encoder, unsigned value)
1494 {
1495         FLAC__ASSERT(0 != encoder);
1496         FLAC__ASSERT(0 != encoder->private_);
1497         FLAC__ASSERT(0 != encoder->protected_);
1498         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1499                 return false;
1500         encoder->protected_->blocksize = value;
1501         return true;
1502 }
1503
1504 FLAC_API FLAC__bool FLAC__stream_encoder_set_do_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value)
1505 {
1506         FLAC__ASSERT(0 != encoder);
1507         FLAC__ASSERT(0 != encoder->private_);
1508         FLAC__ASSERT(0 != encoder->protected_);
1509         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1510                 return false;
1511         encoder->protected_->do_mid_side_stereo = value;
1512         return true;
1513 }
1514
1515 FLAC_API FLAC__bool FLAC__stream_encoder_set_loose_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value)
1516 {
1517         FLAC__ASSERT(0 != encoder);
1518         FLAC__ASSERT(0 != encoder->private_);
1519         FLAC__ASSERT(0 != encoder->protected_);
1520         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1521                 return false;
1522         encoder->protected_->loose_mid_side_stereo = value;
1523         return true;
1524 }
1525
1526 FLAC_API FLAC__bool FLAC__stream_encoder_set_apodization(FLAC__StreamEncoder *encoder, const char *specification)
1527 {
1528         FLAC__ASSERT(0 != encoder);
1529         FLAC__ASSERT(0 != encoder->private_);
1530         FLAC__ASSERT(0 != encoder->protected_);
1531         FLAC__ASSERT(0 != specification);
1532         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1533                 return false;
1534 #ifdef FLAC__INTEGER_ONLY_LIBRARY
1535         (void)specification; /* silently ignore since we haven't integerized; will always use a rectangular window */
1536 #else
1537         encoder->protected_->num_apodizations = 0;
1538         while(1) {
1539                 const char *s = strchr(specification, ';');
1540                 const size_t n = s? (size_t)(s - specification) : strlen(specification);
1541                 if     (n==8  && 0 == strncmp("bartlett"     , specification, n))
1542                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_BARTLETT;
1543                 else if(n==13 && 0 == strncmp("bartlett_hann", specification, n))
1544                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_BARTLETT_HANN;
1545                 else if(n==8  && 0 == strncmp("blackman"     , specification, n))
1546                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_BLACKMAN;
1547                 else if(n==26 && 0 == strncmp("blackman_harris_4term_92db", specification, n))
1548                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_BLACKMAN_HARRIS_4TERM_92DB_SIDELOBE;
1549                 else if(n==6  && 0 == strncmp("connes"       , specification, n))
1550                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_CONNES;
1551                 else if(n==7  && 0 == strncmp("flattop"      , specification, n))
1552                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_FLATTOP;
1553                 else if(n>7   && 0 == strncmp("gauss("       , specification, 6)) {
1554                         FLAC__real stddev = (FLAC__real)strtod(specification+6, 0);
1555                         if (stddev > 0.0 && stddev <= 0.5) {
1556                                 encoder->protected_->apodizations[encoder->protected_->num_apodizations].parameters.gauss.stddev = stddev;
1557                                 encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_GAUSS;
1558                         }
1559                 }
1560                 else if(n==7  && 0 == strncmp("hamming"      , specification, n))
1561                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_HAMMING;
1562                 else if(n==4  && 0 == strncmp("hann"         , specification, n))
1563                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_HANN;
1564                 else if(n==13 && 0 == strncmp("kaiser_bessel", specification, n))
1565                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_KAISER_BESSEL;
1566                 else if(n==7  && 0 == strncmp("nuttall"      , specification, n))
1567                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_NUTTALL;
1568                 else if(n==9  && 0 == strncmp("rectangle"    , specification, n))
1569                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_RECTANGLE;
1570                 else if(n==8  && 0 == strncmp("triangle"     , specification, n))
1571                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_TRIANGLE;
1572                 else if(n>7   && 0 == strncmp("tukey("       , specification, 6)) {
1573                         FLAC__real p = (FLAC__real)strtod(specification+6, 0);
1574                         if (p >= 0.0 && p <= 1.0) {
1575                                 encoder->protected_->apodizations[encoder->protected_->num_apodizations].parameters.tukey.p = p;
1576                                 encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_TUKEY;
1577                         }
1578                 }
1579                 else if(n==5  && 0 == strncmp("welch"        , specification, n))
1580                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_WELCH;
1581                 if (encoder->protected_->num_apodizations == 32)
1582                         break;
1583                 if (s)
1584                         specification = s+1;
1585                 else
1586                         break;
1587         }
1588         if(encoder->protected_->num_apodizations == 0) {
1589                 encoder->protected_->num_apodizations = 1;
1590                 encoder->protected_->apodizations[0].type = FLAC__APODIZATION_TUKEY;
1591                 encoder->protected_->apodizations[0].parameters.tukey.p = 0.5;
1592         }
1593 #endif
1594         return true;
1595 }
1596
1597 FLAC_API FLAC__bool FLAC__stream_encoder_set_max_lpc_order(FLAC__StreamEncoder *encoder, unsigned value)
1598 {
1599         FLAC__ASSERT(0 != encoder);
1600         FLAC__ASSERT(0 != encoder->private_);
1601         FLAC__ASSERT(0 != encoder->protected_);
1602         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1603                 return false;
1604         encoder->protected_->max_lpc_order = value;
1605         return true;
1606 }
1607
1608 FLAC_API FLAC__bool FLAC__stream_encoder_set_qlp_coeff_precision(FLAC__StreamEncoder *encoder, unsigned value)
1609 {
1610         FLAC__ASSERT(0 != encoder);
1611         FLAC__ASSERT(0 != encoder->private_);
1612         FLAC__ASSERT(0 != encoder->protected_);
1613         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1614                 return false;
1615         encoder->protected_->qlp_coeff_precision = value;
1616         return true;
1617 }
1618
1619 FLAC_API FLAC__bool FLAC__stream_encoder_set_do_qlp_coeff_prec_search(FLAC__StreamEncoder *encoder, FLAC__bool value)
1620 {
1621         FLAC__ASSERT(0 != encoder);
1622         FLAC__ASSERT(0 != encoder->private_);
1623         FLAC__ASSERT(0 != encoder->protected_);
1624         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1625                 return false;
1626         encoder->protected_->do_qlp_coeff_prec_search = value;
1627         return true;
1628 }
1629
1630 FLAC_API FLAC__bool FLAC__stream_encoder_set_do_escape_coding(FLAC__StreamEncoder *encoder, FLAC__bool value)
1631 {
1632         FLAC__ASSERT(0 != encoder);
1633         FLAC__ASSERT(0 != encoder->private_);
1634         FLAC__ASSERT(0 != encoder->protected_);
1635         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1636                 return false;
1637 #if 0
1638         /*@@@ deprecated: */
1639         encoder->protected_->do_escape_coding = value;
1640 #else
1641         (void)value;
1642 #endif
1643         return true;
1644 }
1645
1646 FLAC_API FLAC__bool FLAC__stream_encoder_set_do_exhaustive_model_search(FLAC__StreamEncoder *encoder, FLAC__bool value)
1647 {
1648         FLAC__ASSERT(0 != encoder);
1649         FLAC__ASSERT(0 != encoder->private_);
1650         FLAC__ASSERT(0 != encoder->protected_);
1651         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1652                 return false;
1653         encoder->protected_->do_exhaustive_model_search = value;
1654         return true;
1655 }
1656
1657 FLAC_API FLAC__bool FLAC__stream_encoder_set_min_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value)
1658 {
1659         FLAC__ASSERT(0 != encoder);
1660         FLAC__ASSERT(0 != encoder->private_);
1661         FLAC__ASSERT(0 != encoder->protected_);
1662         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1663                 return false;
1664         encoder->protected_->min_residual_partition_order = value;
1665         return true;
1666 }
1667
1668 FLAC_API FLAC__bool FLAC__stream_encoder_set_max_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value)
1669 {
1670         FLAC__ASSERT(0 != encoder);
1671         FLAC__ASSERT(0 != encoder->private_);
1672         FLAC__ASSERT(0 != encoder->protected_);
1673         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1674                 return false;
1675         encoder->protected_->max_residual_partition_order = value;
1676         return true;
1677 }
1678
1679 FLAC_API FLAC__bool FLAC__stream_encoder_set_rice_parameter_search_dist(FLAC__StreamEncoder *encoder, unsigned value)
1680 {
1681         FLAC__ASSERT(0 != encoder);
1682         FLAC__ASSERT(0 != encoder->private_);
1683         FLAC__ASSERT(0 != encoder->protected_);
1684         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1685                 return false;
1686 #if 0
1687         /*@@@ deprecated: */
1688         encoder->protected_->rice_parameter_search_dist = value;
1689 #else
1690         (void)value;
1691 #endif
1692         return true;
1693 }
1694
1695 FLAC_API FLAC__bool FLAC__stream_encoder_set_total_samples_estimate(FLAC__StreamEncoder *encoder, FLAC__uint64 value)
1696 {
1697         FLAC__ASSERT(0 != encoder);
1698         FLAC__ASSERT(0 != encoder->private_);
1699         FLAC__ASSERT(0 != encoder->protected_);
1700         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1701                 return false;
1702         encoder->protected_->total_samples_estimate = value;
1703         return true;
1704 }
1705
1706 FLAC_API FLAC__bool FLAC__stream_encoder_set_metadata(FLAC__StreamEncoder *encoder, FLAC__StreamMetadata **metadata, unsigned num_blocks)
1707 {
1708         FLAC__ASSERT(0 != encoder);
1709         FLAC__ASSERT(0 != encoder->private_);
1710         FLAC__ASSERT(0 != encoder->protected_);
1711         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1712                 return false;
1713         if(0 == metadata)
1714                 num_blocks = 0;
1715         if(0 == num_blocks)
1716                 metadata = 0;
1717         /* realloc() does not do exactly what we want so... */
1718         if(encoder->protected_->metadata) {
1719                 free(encoder->protected_->metadata);
1720                 encoder->protected_->metadata = 0;
1721                 encoder->protected_->num_metadata_blocks = 0;
1722         }
1723         if(num_blocks) {
1724                 FLAC__StreamMetadata **m;
1725                 if(0 == (m = (FLAC__StreamMetadata**)malloc(sizeof(m[0]) * num_blocks)))
1726                         return false;
1727                 memcpy(m, metadata, sizeof(m[0]) * num_blocks);
1728                 encoder->protected_->metadata = m;
1729                 encoder->protected_->num_metadata_blocks = num_blocks;
1730         }
1731 #if FLAC__HAS_OGG
1732         if(!FLAC__ogg_encoder_aspect_set_num_metadata(&encoder->protected_->ogg_encoder_aspect, num_blocks))
1733                 return false;
1734 #endif
1735         return true;
1736 }
1737
1738 /*
1739  * These three functions are not static, but not publically exposed in
1740  * include/FLAC/ either.  They are used by the test suite.
1741  */
1742 FLAC_API FLAC__bool FLAC__stream_encoder_disable_constant_subframes(FLAC__StreamEncoder *encoder, FLAC__bool value)
1743 {
1744         FLAC__ASSERT(0 != encoder);
1745         FLAC__ASSERT(0 != encoder->private_);
1746         FLAC__ASSERT(0 != encoder->protected_);
1747         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1748                 return false;
1749         encoder->private_->disable_constant_subframes = value;
1750         return true;
1751 }
1752
1753 FLAC_API FLAC__bool FLAC__stream_encoder_disable_fixed_subframes(FLAC__StreamEncoder *encoder, FLAC__bool value)
1754 {
1755         FLAC__ASSERT(0 != encoder);
1756         FLAC__ASSERT(0 != encoder->private_);
1757         FLAC__ASSERT(0 != encoder->protected_);
1758         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1759                 return false;
1760         encoder->private_->disable_fixed_subframes = value;
1761         return true;
1762 }
1763
1764 FLAC_API FLAC__bool FLAC__stream_encoder_disable_verbatim_subframes(FLAC__StreamEncoder *encoder, FLAC__bool value)
1765 {
1766         FLAC__ASSERT(0 != encoder);
1767         FLAC__ASSERT(0 != encoder->private_);
1768         FLAC__ASSERT(0 != encoder->protected_);
1769         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1770                 return false;
1771         encoder->private_->disable_verbatim_subframes = value;
1772         return true;
1773 }
1774
1775 FLAC_API FLAC__StreamEncoderState FLAC__stream_encoder_get_state(const FLAC__StreamEncoder *encoder)
1776 {
1777         FLAC__ASSERT(0 != encoder);
1778         FLAC__ASSERT(0 != encoder->private_);
1779         FLAC__ASSERT(0 != encoder->protected_);
1780         return encoder->protected_->state;
1781 }
1782
1783 FLAC_API FLAC__StreamDecoderState FLAC__stream_encoder_get_verify_decoder_state(const FLAC__StreamEncoder *encoder)
1784 {
1785         FLAC__ASSERT(0 != encoder);
1786         FLAC__ASSERT(0 != encoder->private_);
1787         FLAC__ASSERT(0 != encoder->protected_);
1788         if(encoder->protected_->verify)
1789                 return FLAC__stream_decoder_get_state(encoder->private_->verify.decoder);
1790         else
1791                 return FLAC__STREAM_DECODER_UNINITIALIZED;
1792 }
1793
1794 FLAC_API const char *FLAC__stream_encoder_get_resolved_state_string(const FLAC__StreamEncoder *encoder)
1795 {
1796         FLAC__ASSERT(0 != encoder);
1797         FLAC__ASSERT(0 != encoder->private_);
1798         FLAC__ASSERT(0 != encoder->protected_);
1799         if(encoder->protected_->state != FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR)
1800                 return FLAC__StreamEncoderStateString[encoder->protected_->state];
1801         else
1802                 return FLAC__stream_decoder_get_resolved_state_string(encoder->private_->verify.decoder);
1803 }
1804
1805 FLAC_API void FLAC__stream_encoder_get_verify_decoder_error_stats(const FLAC__StreamEncoder *encoder, FLAC__uint64 *absolute_sample, unsigned *frame_number, unsigned *channel, unsigned *sample, FLAC__int32 *expected, FLAC__int32 *got)
1806 {
1807         FLAC__ASSERT(0 != encoder);
1808         FLAC__ASSERT(0 != encoder->private_);
1809         FLAC__ASSERT(0 != encoder->protected_);
1810         if(0 != absolute_sample)
1811                 *absolute_sample = encoder->private_->verify.error_stats.absolute_sample;
1812         if(0 != frame_number)
1813                 *frame_number = encoder->private_->verify.error_stats.frame_number;
1814         if(0 != channel)
1815                 *channel = encoder->private_->verify.error_stats.channel;
1816         if(0 != sample)
1817                 *sample = encoder->private_->verify.error_stats.sample;
1818         if(0 != expected)
1819                 *expected = encoder->private_->verify.error_stats.expected;
1820         if(0 != got)
1821                 *got = encoder->private_->verify.error_stats.got;
1822 }
1823
1824 FLAC_API FLAC__bool FLAC__stream_encoder_get_verify(const FLAC__StreamEncoder *encoder)
1825 {
1826         FLAC__ASSERT(0 != encoder);
1827         FLAC__ASSERT(0 != encoder->private_);
1828         FLAC__ASSERT(0 != encoder->protected_);
1829         return encoder->protected_->verify;
1830 }
1831
1832 FLAC_API FLAC__bool FLAC__stream_encoder_get_streamable_subset(const FLAC__StreamEncoder *encoder)
1833 {
1834         FLAC__ASSERT(0 != encoder);
1835         FLAC__ASSERT(0 != encoder->private_);
1836         FLAC__ASSERT(0 != encoder->protected_);
1837         return encoder->protected_->streamable_subset;
1838 }
1839
1840 FLAC_API unsigned FLAC__stream_encoder_get_channels(const FLAC__StreamEncoder *encoder)
1841 {
1842         FLAC__ASSERT(0 != encoder);
1843         FLAC__ASSERT(0 != encoder->private_);
1844         FLAC__ASSERT(0 != encoder->protected_);
1845         return encoder->protected_->channels;
1846 }
1847
1848 FLAC_API unsigned FLAC__stream_encoder_get_bits_per_sample(const FLAC__StreamEncoder *encoder)
1849 {
1850         FLAC__ASSERT(0 != encoder);
1851         FLAC__ASSERT(0 != encoder->private_);
1852         FLAC__ASSERT(0 != encoder->protected_);
1853         return encoder->protected_->bits_per_sample;
1854 }
1855
1856 FLAC_API unsigned FLAC__stream_encoder_get_sample_rate(const FLAC__StreamEncoder *encoder)
1857 {
1858         FLAC__ASSERT(0 != encoder);
1859         FLAC__ASSERT(0 != encoder->private_);
1860         FLAC__ASSERT(0 != encoder->protected_);
1861         return encoder->protected_->sample_rate;
1862 }
1863
1864 FLAC_API unsigned FLAC__stream_encoder_get_blocksize(const FLAC__StreamEncoder *encoder)
1865 {
1866         FLAC__ASSERT(0 != encoder);
1867         FLAC__ASSERT(0 != encoder->private_);
1868         FLAC__ASSERT(0 != encoder->protected_);
1869         return encoder->protected_->blocksize;
1870 }
1871
1872 FLAC_API FLAC__bool FLAC__stream_encoder_get_do_mid_side_stereo(const FLAC__StreamEncoder *encoder)
1873 {
1874         FLAC__ASSERT(0 != encoder);
1875         FLAC__ASSERT(0 != encoder->private_);
1876         FLAC__ASSERT(0 != encoder->protected_);
1877         return encoder->protected_->do_mid_side_stereo;
1878 }
1879
1880 FLAC_API FLAC__bool FLAC__stream_encoder_get_loose_mid_side_stereo(const FLAC__StreamEncoder *encoder)
1881 {
1882         FLAC__ASSERT(0 != encoder);
1883         FLAC__ASSERT(0 != encoder->private_);
1884         FLAC__ASSERT(0 != encoder->protected_);
1885         return encoder->protected_->loose_mid_side_stereo;
1886 }
1887
1888 FLAC_API unsigned FLAC__stream_encoder_get_max_lpc_order(const FLAC__StreamEncoder *encoder)
1889 {
1890         FLAC__ASSERT(0 != encoder);
1891         FLAC__ASSERT(0 != encoder->private_);
1892         FLAC__ASSERT(0 != encoder->protected_);
1893         return encoder->protected_->max_lpc_order;
1894 }
1895
1896 FLAC_API unsigned FLAC__stream_encoder_get_qlp_coeff_precision(const FLAC__StreamEncoder *encoder)
1897 {
1898         FLAC__ASSERT(0 != encoder);
1899         FLAC__ASSERT(0 != encoder->private_);
1900         FLAC__ASSERT(0 != encoder->protected_);
1901         return encoder->protected_->qlp_coeff_precision;
1902 }
1903
1904 FLAC_API FLAC__bool FLAC__stream_encoder_get_do_qlp_coeff_prec_search(const FLAC__StreamEncoder *encoder)
1905 {
1906         FLAC__ASSERT(0 != encoder);
1907         FLAC__ASSERT(0 != encoder->private_);
1908         FLAC__ASSERT(0 != encoder->protected_);
1909         return encoder->protected_->do_qlp_coeff_prec_search;
1910 }
1911
1912 FLAC_API FLAC__bool FLAC__stream_encoder_get_do_escape_coding(const FLAC__StreamEncoder *encoder)
1913 {
1914         FLAC__ASSERT(0 != encoder);
1915         FLAC__ASSERT(0 != encoder->private_);
1916         FLAC__ASSERT(0 != encoder->protected_);
1917         return encoder->protected_->do_escape_coding;
1918 }
1919
1920 FLAC_API FLAC__bool FLAC__stream_encoder_get_do_exhaustive_model_search(const FLAC__StreamEncoder *encoder)
1921 {
1922         FLAC__ASSERT(0 != encoder);
1923         FLAC__ASSERT(0 != encoder->private_);
1924         FLAC__ASSERT(0 != encoder->protected_);
1925         return encoder->protected_->do_exhaustive_model_search;
1926 }
1927
1928 FLAC_API unsigned FLAC__stream_encoder_get_min_residual_partition_order(const FLAC__StreamEncoder *encoder)
1929 {
1930         FLAC__ASSERT(0 != encoder);
1931         FLAC__ASSERT(0 != encoder->private_);
1932         FLAC__ASSERT(0 != encoder->protected_);
1933         return encoder->protected_->min_residual_partition_order;
1934 }
1935
1936 FLAC_API unsigned FLAC__stream_encoder_get_max_residual_partition_order(const FLAC__StreamEncoder *encoder)
1937 {
1938         FLAC__ASSERT(0 != encoder);
1939         FLAC__ASSERT(0 != encoder->private_);
1940         FLAC__ASSERT(0 != encoder->protected_);
1941         return encoder->protected_->max_residual_partition_order;
1942 }
1943
1944 FLAC_API unsigned FLAC__stream_encoder_get_rice_parameter_search_dist(const FLAC__StreamEncoder *encoder)
1945 {
1946         FLAC__ASSERT(0 != encoder);
1947         FLAC__ASSERT(0 != encoder->private_);
1948         FLAC__ASSERT(0 != encoder->protected_);
1949         return encoder->protected_->rice_parameter_search_dist;
1950 }
1951
1952 FLAC_API FLAC__uint64 FLAC__stream_encoder_get_total_samples_estimate(const FLAC__StreamEncoder *encoder)
1953 {
1954         FLAC__ASSERT(0 != encoder);
1955         FLAC__ASSERT(0 != encoder->private_);
1956         FLAC__ASSERT(0 != encoder->protected_);
1957         return encoder->protected_->total_samples_estimate;
1958 }
1959
1960 FLAC_API FLAC__bool FLAC__stream_encoder_process(FLAC__StreamEncoder *encoder, const FLAC__int32 * const buffer[], unsigned samples)
1961 {
1962         unsigned i, j, channel;
1963         FLAC__int32 x, mid, side;
1964         const unsigned channels = encoder->protected_->channels, blocksize = encoder->protected_->blocksize;
1965
1966         FLAC__ASSERT(0 != encoder);
1967         FLAC__ASSERT(0 != encoder->private_);
1968         FLAC__ASSERT(0 != encoder->protected_);
1969         FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
1970
1971         j = 0;
1972         /*
1973          * we have several flavors of the same basic loop, optimized for
1974          * different conditions:
1975          */
1976         if(encoder->protected_->max_lpc_order > 0) {
1977                 if(encoder->protected_->do_mid_side_stereo && channels == 2) {
1978                         /*
1979                          * stereo coding: unroll channel loop
1980                          * with LPC: calculate floating point version of signal
1981                          */
1982                         do {
1983                                 if(encoder->protected_->verify)
1984                                         append_to_verify_fifo_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize+1-encoder->private_->current_sample_number, samples-j));
1985
1986                                 /* "i <= blocksize" to overread 1 sample; see comment in OVERREAD_ decl */
1987                                 for(i = encoder->private_->current_sample_number; i <= blocksize && j < samples; i++, j++) {
1988                                         x = mid = side = buffer[0][j];
1989                                         encoder->private_->integer_signal[0][i] = x;
1990 #ifndef FLAC__INTEGER_ONLY_LIBRARY
1991                                         encoder->private_->real_signal[0][i] = (FLAC__real)x;
1992 #endif
1993                                         x = buffer[1][j];
1994                                         encoder->private_->integer_signal[1][i] = x;
1995 #ifndef FLAC__INTEGER_ONLY_LIBRARY
1996                                         encoder->private_->real_signal[1][i] = (FLAC__real)x;
1997 #endif
1998                                         mid += x;
1999                                         side -= x;
2000                                         mid >>= 1; /* NOTE: not the same as 'mid = (buffer[0][j] + buffer[1][j]) / 2' ! */
2001                                         encoder->private_->integer_signal_mid_side[1][i] = side;
2002                                         encoder->private_->integer_signal_mid_side[0][i] = mid;
2003 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2004                                         encoder->private_->real_signal_mid_side[1][i] = (FLAC__real)side;
2005                                         encoder->private_->real_signal_mid_side[0][i] = (FLAC__real)mid;
2006 #endif
2007                                         encoder->private_->current_sample_number++;
2008                                 }
2009                                 /* we only process if we have a full block + 1 extra sample; final block is always handled by FLAC__stream_encoder_finish() */
2010                                 if(i > blocksize) {
2011                                         if(!process_frame_(encoder, /*is_fractional_block=*/false, /*is_last_block=*/false))
2012                                                 return false;
2013                                         /* move unprocessed overread samples to beginnings of arrays */
2014                                         FLAC__ASSERT(i == blocksize+OVERREAD_);
2015                                         FLAC__ASSERT(OVERREAD_ == 1); /* assert we only overread 1 sample which simplifies the rest of the code below */
2016                                         i--;
2017                                         encoder->private_->integer_signal[0][0] = encoder->private_->integer_signal[0][i];
2018                                         encoder->private_->integer_signal[1][0] = encoder->private_->integer_signal[1][i];
2019                                         encoder->private_->integer_signal_mid_side[0][0] = encoder->private_->integer_signal_mid_side[0][i];
2020                                         encoder->private_->integer_signal_mid_side[1][0] = encoder->private_->integer_signal_mid_side[1][i];
2021 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2022                                         encoder->private_->real_signal[0][0] = encoder->private_->real_signal[0][i];
2023                                         encoder->private_->real_signal[1][0] = encoder->private_->real_signal[1][i];
2024                                         encoder->private_->real_signal_mid_side[0][0] = encoder->private_->real_signal_mid_side[0][i];
2025                                         encoder->private_->real_signal_mid_side[1][0] = encoder->private_->real_signal_mid_side[1][i];
2026 #endif
2027                                         encoder->private_->current_sample_number = 1;
2028                                 }
2029                         } while(j < samples);
2030                 }
2031                 else {
2032                         /*
2033                          * independent channel coding: buffer each channel in inner loop
2034                          * with LPC: calculate floating point version of signal
2035                          */
2036                         do {
2037                                 if(encoder->protected_->verify)
2038                                         append_to_verify_fifo_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize+1-encoder->private_->current_sample_number, samples-j));
2039
2040                                 /* "i <= blocksize" to overread 1 sample; see comment in OVERREAD_ decl */
2041                                 for(i = encoder->private_->current_sample_number; i <= blocksize && j < samples; i++, j++) {
2042                                         for(channel = 0; channel < channels; channel++) {
2043                                                 x = buffer[channel][j];
2044                                                 encoder->private_->integer_signal[channel][i] = x;
2045 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2046                                                 encoder->private_->real_signal[channel][i] = (FLAC__real)x;
2047 #endif
2048                                         }
2049                                         encoder->private_->current_sample_number++;
2050                                 }
2051                                 /* we only process if we have a full block + 1 extra sample; final block is always handled by FLAC__stream_encoder_finish() */
2052                                 if(i > blocksize) {
2053                                         if(!process_frame_(encoder, /*is_fractional_block=*/false, /*is_last_block=*/false))
2054                                                 return false;
2055                                         /* move unprocessed overread samples to beginnings of arrays */
2056                                         FLAC__ASSERT(i == blocksize+OVERREAD_);
2057                                         FLAC__ASSERT(OVERREAD_ == 1); /* assert we only overread 1 sample which simplifies the rest of the code below */
2058                                         i--;
2059                                         for(channel = 0; channel < channels; channel++) {
2060                                                 encoder->private_->integer_signal[channel][0] = encoder->private_->integer_signal[channel][i];
2061 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2062                                                 encoder->private_->real_signal[channel][0] = encoder->private_->real_signal[channel][i];
2063 #endif
2064                                         }
2065                                         encoder->private_->current_sample_number = 1;
2066                                 }
2067                         } while(j < samples);
2068                 }
2069         }
2070         else {
2071                 if(encoder->protected_->do_mid_side_stereo && channels == 2) {
2072                         /*
2073                          * stereo coding: unroll channel loop
2074                          * without LPC: no need to calculate floating point version of signal
2075                          */
2076                         do {
2077                                 if(encoder->protected_->verify)
2078                                         append_to_verify_fifo_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize+1-encoder->private_->current_sample_number, samples-j));
2079
2080                                 /* "i <= blocksize" to overread 1 sample; see comment in OVERREAD_ decl */
2081                                 for(i = encoder->private_->current_sample_number; i <= blocksize && j < samples; i++, j++) {
2082                                         encoder->private_->integer_signal[0][i] = mid = side = buffer[0][j];
2083                                         x = buffer[1][j];
2084                                         encoder->private_->integer_signal[1][i] = x;
2085                                         mid += x;
2086                                         side -= x;
2087                                         mid >>= 1; /* NOTE: not the same as 'mid = (buffer[0][j] + buffer[1][j]) / 2' ! */
2088                                         encoder->private_->integer_signal_mid_side[1][i] = side;
2089                                         encoder->private_->integer_signal_mid_side[0][i] = mid;
2090                                         encoder->private_->current_sample_number++;
2091                                 }
2092                                 /* we only process if we have a full block + 1 extra sample; final block is always handled by FLAC__stream_encoder_finish() */
2093                                 if(i > blocksize) {
2094                                         if(!process_frame_(encoder, /*is_fractional_block=*/false, /*is_last_block=*/false))
2095                                                 return false;
2096                                         /* move unprocessed overread samples to beginnings of arrays */
2097                                         FLAC__ASSERT(i == blocksize+OVERREAD_);
2098                                         FLAC__ASSERT(OVERREAD_ == 1); /* assert we only overread 1 sample which simplifies the rest of the code below */
2099                                         i--;
2100                                         encoder->private_->integer_signal[0][0] = encoder->private_->integer_signal[0][i];
2101                                         encoder->private_->integer_signal[1][0] = encoder->private_->integer_signal[1][i];
2102                                         encoder->private_->integer_signal_mid_side[0][0] = encoder->private_->integer_signal_mid_side[0][i];
2103                                         encoder->private_->integer_signal_mid_side[1][0] = encoder->private_->integer_signal_mid_side[1][i];
2104                                         encoder->private_->current_sample_number = 1;
2105                                 }
2106                         } while(j < samples);
2107                 }
2108                 else {
2109                         /*
2110                          * independent channel coding: buffer each channel in inner loop
2111                          * without LPC: no need to calculate floating point version of signal
2112                          */
2113                         do {
2114                                 if(encoder->protected_->verify)
2115                                         append_to_verify_fifo_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize+1-encoder->private_->current_sample_number, samples-j));
2116
2117                                 /* "i <= blocksize" to overread 1 sample; see comment in OVERREAD_ decl */
2118                                 for(i = encoder->private_->current_sample_number; i <= blocksize && j < samples; i++, j++) {
2119                                         for(channel = 0; channel < channels; channel++)
2120                                                 encoder->private_->integer_signal[channel][i] = buffer[channel][j];
2121                                         encoder->private_->current_sample_number++;
2122                                 }
2123                                 /* we only process if we have a full block + 1 extra sample; final block is always handled by FLAC__stream_encoder_finish() */
2124                                 if(i > blocksize) {
2125                                         if(!process_frame_(encoder, /*is_fractional_block=*/false, /*is_last_block=*/false))
2126                                                 return false;
2127                                         /* move unprocessed overread samples to beginnings of arrays */
2128                                         FLAC__ASSERT(i == blocksize+OVERREAD_);
2129                                         FLAC__ASSERT(OVERREAD_ == 1); /* assert we only overread 1 sample which simplifies the rest of the code below */
2130                                         i--;
2131                                         for(channel = 0; channel < channels; channel++)
2132                                                 encoder->private_->integer_signal[channel][0] = encoder->private_->integer_signal[channel][i];
2133                                         encoder->private_->current_sample_number = 1;
2134                                 }
2135                         } while(j < samples);
2136                 }
2137         }
2138
2139         return true;
2140 }
2141
2142 FLAC_API FLAC__bool FLAC__stream_encoder_process_interleaved(FLAC__StreamEncoder *encoder, const FLAC__int32 buffer[], unsigned samples)
2143 {
2144         unsigned i, j, k, channel;
2145         FLAC__int32 x, mid, side;
2146         const unsigned channels = encoder->protected_->channels, blocksize = encoder->protected_->blocksize;
2147
2148         FLAC__ASSERT(0 != encoder);
2149         FLAC__ASSERT(0 != encoder->private_);
2150         FLAC__ASSERT(0 != encoder->protected_);
2151         FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
2152
2153         j = k = 0;
2154         /*
2155          * we have several flavors of the same basic loop, optimized for
2156          * different conditions:
2157          */
2158         if(encoder->protected_->max_lpc_order > 0) {
2159                 if(encoder->protected_->do_mid_side_stereo && channels == 2) {
2160                         /*
2161                          * stereo coding: unroll channel loop
2162                          * with LPC: calculate floating point version of signal
2163                          */
2164                         do {
2165                                 if(encoder->protected_->verify)
2166                                         append_to_verify_fifo_interleaved_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize+1-encoder->private_->current_sample_number, samples-j));
2167
2168                                 /* "i <= blocksize" to overread 1 sample; see comment in OVERREAD_ decl */
2169                                 for(i = encoder->private_->current_sample_number; i <= blocksize && j < samples; i++, j++) {
2170                                         x = mid = side = buffer[k++];
2171                                         encoder->private_->integer_signal[0][i] = x;
2172 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2173                                         encoder->private_->real_signal[0][i] = (FLAC__real)x;
2174 #endif
2175                                         x = buffer[k++];
2176                                         encoder->private_->integer_signal[1][i] = x;
2177 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2178                                         encoder->private_->real_signal[1][i] = (FLAC__real)x;
2179 #endif
2180                                         mid += x;
2181                                         side -= x;
2182                                         mid >>= 1; /* NOTE: not the same as 'mid = (left + right) / 2' ! */
2183                                         encoder->private_->integer_signal_mid_side[1][i] = side;
2184                                         encoder->private_->integer_signal_mid_side[0][i] = mid;
2185 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2186                                         encoder->private_->real_signal_mid_side[1][i] = (FLAC__real)side;
2187                                         encoder->private_->real_signal_mid_side[0][i] = (FLAC__real)mid;
2188 #endif
2189                                         encoder->private_->current_sample_number++;
2190                                 }
2191                                 /* we only process if we have a full block + 1 extra sample; final block is always handled by FLAC__stream_encoder_finish() */
2192                                 if(i > blocksize) {
2193                                         if(!process_frame_(encoder, /*is_fractional_block=*/false, /*is_last_block=*/false))
2194                                                 return false;
2195                                         /* move unprocessed overread samples to beginnings of arrays */
2196                                         FLAC__ASSERT(i == blocksize+OVERREAD_);
2197                                         FLAC__ASSERT(OVERREAD_ == 1); /* assert we only overread 1 sample which simplifies the rest of the code below */
2198                                         i--;
2199                                         encoder->private_->integer_signal[0][0] = encoder->private_->integer_signal[0][i];
2200                                         encoder->private_->integer_signal[1][0] = encoder->private_->integer_signal[1][i];
2201                                         encoder->private_->integer_signal_mid_side[0][0] = encoder->private_->integer_signal_mid_side[0][i];
2202                                         encoder->private_->integer_signal_mid_side[1][0] = encoder->private_->integer_signal_mid_side[1][i];
2203 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2204                                         encoder->private_->real_signal[0][0] = encoder->private_->real_signal[0][i];
2205                                         encoder->private_->real_signal[1][0] = encoder->private_->real_signal[1][i];
2206                                         encoder->private_->real_signal_mid_side[0][0] = encoder->private_->real_signal_mid_side[0][i];
2207                                         encoder->private_->real_signal_mid_side[1][0] = encoder->private_->real_signal_mid_side[1][i];
2208 #endif
2209                                         encoder->private_->current_sample_number = 1;
2210                                 }
2211                         } while(j < samples);
2212                 }
2213                 else {
2214                         /*
2215                          * independent channel coding: buffer each channel in inner loop
2216                          * with LPC: calculate floating point version of signal
2217                          */
2218                         do {
2219                                 if(encoder->protected_->verify)
2220                                         append_to_verify_fifo_interleaved_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize+1-encoder->private_->current_sample_number, samples-j));
2221
2222                                 /* "i <= blocksize" to overread 1 sample; see comment in OVERREAD_ decl */
2223                                 for(i = encoder->private_->current_sample_number; i <= blocksize && j < samples; i++, j++) {
2224                                         for(channel = 0; channel < channels; channel++) {
2225                                                 x = buffer[k++];
2226                                                 encoder->private_->integer_signal[channel][i] = x;
2227 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2228                                                 encoder->private_->real_signal[channel][i] = (FLAC__real)x;
2229 #endif
2230                                         }
2231                                         encoder->private_->current_sample_number++;
2232                                 }
2233                                 /* we only process if we have a full block + 1 extra sample; final block is always handled by FLAC__stream_encoder_finish() */
2234                                 if(i > blocksize) {
2235                                         if(!process_frame_(encoder, /*is_fractional_block=*/false, /*is_last_block=*/false))
2236                                                 return false;
2237                                         /* move unprocessed overread samples to beginnings of arrays */
2238                                         FLAC__ASSERT(i == blocksize+OVERREAD_);
2239                                         FLAC__ASSERT(OVERREAD_ == 1); /* assert we only overread 1 sample which simplifies the rest of the code below */
2240                                         i--;
2241                                         for(channel = 0; channel < channels; channel++) {
2242                                                 encoder->private_->integer_signal[channel][0] = encoder->private_->integer_signal[channel][i];
2243 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2244                                                 encoder->private_->real_signal[channel][0] = encoder->private_->real_signal[channel][i];
2245 #endif
2246                                         }
2247                                         encoder->private_->current_sample_number = 1;
2248                                 }
2249                         } while(j < samples);
2250                 }
2251         }
2252         else {
2253                 if(encoder->protected_->do_mid_side_stereo && channels == 2) {
2254                         /*
2255                          * stereo coding: unroll channel loop
2256                          * without LPC: no need to calculate floating point version of signal
2257                          */
2258                         do {
2259                                 if(encoder->protected_->verify)
2260                                         append_to_verify_fifo_interleaved_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize+1-encoder->private_->current_sample_number, samples-j));
2261
2262                                 /* "i <= blocksize" to overread 1 sample; see comment in OVERREAD_ decl */
2263                                 for(i = encoder->private_->current_sample_number; i <= blocksize && j < samples; i++, j++) {
2264                                         encoder->private_->integer_signal[0][i] = mid = side = buffer[k++];
2265                                         x = buffer[k++];
2266                                         encoder->private_->integer_signal[1][i] = x;
2267                                         mid += x;
2268                                         side -= x;
2269                                         mid >>= 1; /* NOTE: not the same as 'mid = (left + right) / 2' ! */
2270                                         encoder->private_->integer_signal_mid_side[1][i] = side;
2271                                         encoder->private_->integer_signal_mid_side[0][i] = mid;
2272                                         encoder->private_->current_sample_number++;
2273                                 }
2274                                 /* we only process if we have a full block + 1 extra sample; final block is always handled by FLAC__stream_encoder_finish() */
2275                                 if(i > blocksize) {
2276                                         if(!process_frame_(encoder, /*is_fractional_block=*/false, /*is_last_block=*/false))
2277                                                 return false;
2278                                         /* move unprocessed overread samples to beginnings of arrays */
2279                                         FLAC__ASSERT(i == blocksize+OVERREAD_);
2280                                         FLAC__ASSERT(OVERREAD_ == 1); /* assert we only overread 1 sample which simplifies the rest of the code below */
2281                                         i--;
2282                                         encoder->private_->integer_signal[0][0] = encoder->private_->integer_signal[0][i];
2283                                         encoder->private_->integer_signal[1][0] = encoder->private_->integer_signal[1][i];
2284                                         encoder->private_->integer_signal_mid_side[0][0] = encoder->private_->integer_signal_mid_side[0][i];
2285                                         encoder->private_->integer_signal_mid_side[1][0] = encoder->private_->integer_signal_mid_side[1][i];
2286                                         encoder->private_->current_sample_number = 1;
2287                                 }
2288                         } while(j < samples);
2289                 }
2290                 else {
2291                         /*
2292                          * independent channel coding: buffer each channel in inner loop
2293                          * without LPC: no need to calculate floating point version of signal
2294                          */
2295                         do {
2296                                 if(encoder->protected_->verify)
2297                                         append_to_verify_fifo_interleaved_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize+1-encoder->private_->current_sample_number, samples-j));
2298
2299                                 /* "i <= blocksize" to overread 1 sample; see comment in OVERREAD_ decl */
2300                                 for(i = encoder->private_->current_sample_number; i <= blocksize && j < samples; i++, j++) {
2301                                         for(channel = 0; channel < channels; channel++)
2302                                                 encoder->private_->integer_signal[channel][i] = buffer[k++];
2303                                         encoder->private_->current_sample_number++;
2304                                 }
2305                                 /* we only process if we have a full block + 1 extra sample; final block is always handled by FLAC__stream_encoder_finish() */
2306                                 if(i > blocksize) {
2307                                         if(!process_frame_(encoder, /*is_fractional_block=*/false, /*is_last_block=*/false))
2308                                                 return false;
2309                                         /* move unprocessed overread samples to beginnings of arrays */
2310                                         FLAC__ASSERT(i == blocksize+OVERREAD_);
2311                                         FLAC__ASSERT(OVERREAD_ == 1); /* assert we only overread 1 sample which simplifies the rest of the code below */
2312                                         i--;
2313                                         for(channel = 0; channel < channels; channel++)
2314                                                 encoder->private_->integer_signal[channel][0] = encoder->private_->integer_signal[channel][i];
2315                                         encoder->private_->current_sample_number = 1;
2316                                 }
2317                         } while(j < samples);
2318                 }
2319         }
2320
2321         return true;
2322 }
2323
2324 /***********************************************************************
2325  *
2326  * Private class methods
2327  *
2328  ***********************************************************************/
2329
2330 void set_defaults_(FLAC__StreamEncoder *encoder)
2331 {
2332         FLAC__ASSERT(0 != encoder);
2333
2334 #ifdef FLAC__MANDATORY_VERIFY_WHILE_ENCODING
2335         encoder->protected_->verify = true;
2336 #else
2337         encoder->protected_->verify = false;
2338 #endif
2339         encoder->protected_->streamable_subset = true;
2340         encoder->protected_->do_mid_side_stereo = false;
2341         encoder->protected_->loose_mid_side_stereo = false;
2342         encoder->protected_->channels = 2;
2343         encoder->protected_->bits_per_sample = 16;
2344         encoder->protected_->sample_rate = 44100;
2345         encoder->protected_->blocksize = 0;
2346 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2347         encoder->protected_->num_apodizations = 1;
2348         encoder->protected_->apodizations[0].type = FLAC__APODIZATION_TUKEY;
2349         encoder->protected_->apodizations[0].parameters.tukey.p = 0.5;
2350 #endif
2351         encoder->protected_->max_lpc_order = 0;
2352         encoder->protected_->qlp_coeff_precision = 0;
2353         encoder->protected_->do_qlp_coeff_prec_search = false;
2354         encoder->protected_->do_exhaustive_model_search = false;
2355         encoder->protected_->do_escape_coding = false;
2356         encoder->protected_->min_residual_partition_order = 0;
2357         encoder->protected_->max_residual_partition_order = 0;
2358         encoder->protected_->rice_parameter_search_dist = 0;
2359         encoder->protected_->total_samples_estimate = 0;
2360         encoder->protected_->metadata = 0;
2361         encoder->protected_->num_metadata_blocks = 0;
2362
2363         encoder->private_->seek_table = 0;
2364         encoder->private_->disable_constant_subframes = false;
2365         encoder->private_->disable_fixed_subframes = false;
2366         encoder->private_->disable_verbatim_subframes = false;
2367 #if FLAC__HAS_OGG
2368         encoder->private_->is_ogg = false;
2369 #endif
2370         encoder->private_->read_callback = 0;
2371         encoder->private_->write_callback = 0;
2372         encoder->private_->seek_callback = 0;
2373         encoder->private_->tell_callback = 0;
2374         encoder->private_->metadata_callback = 0;
2375         encoder->private_->progress_callback = 0;
2376         encoder->private_->client_data = 0;
2377
2378 #if FLAC__HAS_OGG
2379         FLAC__ogg_encoder_aspect_set_defaults(&encoder->protected_->ogg_encoder_aspect);
2380 #endif
2381 }
2382
2383 void free_(FLAC__StreamEncoder *encoder)
2384 {
2385         unsigned i, channel;
2386
2387         FLAC__ASSERT(0 != encoder);
2388         if(encoder->protected_->metadata) {
2389                 free(encoder->protected_->metadata);
2390                 encoder->protected_->metadata = 0;
2391                 encoder->protected_->num_metadata_blocks = 0;
2392         }
2393         for(i = 0; i < encoder->protected_->channels; i++) {
2394                 if(0 != encoder->private_->integer_signal_unaligned[i]) {
2395                         free(encoder->private_->integer_signal_unaligned[i]);
2396                         encoder->private_->integer_signal_unaligned[i] = 0;
2397                 }
2398 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2399                 if(0 != encoder->private_->real_signal_unaligned[i]) {
2400                         free(encoder->private_->real_signal_unaligned[i]);
2401                         encoder->private_->real_signal_unaligned[i] = 0;
2402                 }
2403 #endif
2404         }
2405         for(i = 0; i < 2; i++) {
2406                 if(0 != encoder->private_->integer_signal_mid_side_unaligned[i]) {
2407                         free(encoder->private_->integer_signal_mid_side_unaligned[i]);
2408                         encoder->private_->integer_signal_mid_side_unaligned[i] = 0;
2409                 }
2410 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2411                 if(0 != encoder->private_->real_signal_mid_side_unaligned[i]) {
2412                         free(encoder->private_->real_signal_mid_side_unaligned[i]);
2413                         encoder->private_->real_signal_mid_side_unaligned[i] = 0;
2414                 }
2415 #endif
2416         }
2417 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2418         for(i = 0; i < encoder->protected_->num_apodizations; i++) {
2419                 if(0 != encoder->private_->window_unaligned[i]) {
2420                         free(encoder->private_->window_unaligned[i]);
2421                         encoder->private_->window_unaligned[i] = 0;
2422                 }
2423         }
2424         if(0 != encoder->private_->windowed_signal_unaligned) {
2425                 free(encoder->private_->windowed_signal_unaligned);
2426                 encoder->private_->windowed_signal_unaligned = 0;
2427         }
2428 #endif
2429         for(channel = 0; channel < encoder->protected_->channels; channel++) {
2430                 for(i = 0; i < 2; i++) {
2431                         if(0 != encoder->private_->residual_workspace_unaligned[channel][i]) {
2432                                 free(encoder->private_->residual_workspace_unaligned[channel][i]);
2433                                 encoder->private_->residual_workspace_unaligned[channel][i] = 0;
2434                         }
2435                 }
2436         }
2437         for(channel = 0; channel < 2; channel++) {
2438                 for(i = 0; i < 2; i++) {
2439                         if(0 != encoder->private_->residual_workspace_mid_side_unaligned[channel][i]) {
2440                                 free(encoder->private_->residual_workspace_mid_side_unaligned[channel][i]);
2441                                 encoder->private_->residual_workspace_mid_side_unaligned[channel][i] = 0;
2442                         }
2443                 }
2444         }
2445         if(0 != encoder->private_->abs_residual_partition_sums_unaligned) {
2446                 free(encoder->private_->abs_residual_partition_sums_unaligned);
2447                 encoder->private_->abs_residual_partition_sums_unaligned = 0;
2448         }
2449         if(0 != encoder->private_->raw_bits_per_partition_unaligned) {
2450                 free(encoder->private_->raw_bits_per_partition_unaligned);
2451                 encoder->private_->raw_bits_per_partition_unaligned = 0;
2452         }
2453         if(encoder->protected_->verify) {
2454                 for(i = 0; i < encoder->protected_->channels; i++) {
2455                         if(0 != encoder->private_->verify.input_fifo.data[i]) {
2456                                 free(encoder->private_->verify.input_fifo.data[i]);
2457                                 encoder->private_->verify.input_fifo.data[i] = 0;
2458                         }
2459                 }
2460         }
2461         FLAC__bitwriter_free(encoder->private_->frame);
2462 }
2463
2464 FLAC__bool resize_buffers_(FLAC__StreamEncoder *encoder, unsigned new_blocksize)
2465 {
2466         FLAC__bool ok;
2467         unsigned i, channel;
2468
2469         FLAC__ASSERT(new_blocksize > 0);
2470         FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
2471         FLAC__ASSERT(encoder->private_->current_sample_number == 0);
2472
2473         /* To avoid excessive malloc'ing, we only grow the buffer; no shrinking. */
2474         if(new_blocksize <= encoder->private_->input_capacity)
2475                 return true;
2476
2477         ok = true;
2478
2479         /* WATCHOUT: FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32_mmx()
2480          * requires that the input arrays (in our case the integer signals)
2481          * have a buffer of up to 3 zeroes in front (at negative indices) for
2482          * alignment purposes; we use 4 in front to keep the data well-aligned.
2483          */
2484
2485         for(i = 0; ok && i < encoder->protected_->channels; i++) {
2486                 ok = ok && FLAC__memory_alloc_aligned_int32_array(new_blocksize+4+OVERREAD_, &encoder->private_->integer_signal_unaligned[i], &encoder->private_->integer_signal[i]);
2487                 memset(encoder->private_->integer_signal[i], 0, sizeof(FLAC__int32)*4);
2488                 encoder->private_->integer_signal[i] += 4;
2489 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2490                 if(encoder->protected_->max_lpc_order > 0)
2491                         ok = ok && FLAC__memory_alloc_aligned_real_array(new_blocksize+OVERREAD_, &encoder->private_->real_signal_unaligned[i], &encoder->private_->real_signal[i]);
2492 #endif
2493         }
2494         for(i = 0; ok && i < 2; i++) {
2495                 ok = ok && FLAC__memory_alloc_aligned_int32_array(new_blocksize+4+OVERREAD_, &encoder->private_->integer_signal_mid_side_unaligned[i], &encoder->private_->integer_signal_mid_side[i]);
2496                 memset(encoder->private_->integer_signal_mid_side[i], 0, sizeof(FLAC__int32)*4);
2497                 encoder->private_->integer_signal_mid_side[i] += 4;
2498 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2499                 if(encoder->protected_->max_lpc_order > 0)
2500                         ok = ok && FLAC__memory_alloc_aligned_real_array(new_blocksize+OVERREAD_, &encoder->private_->real_signal_mid_side_unaligned[i], &encoder->private_->real_signal_mid_side[i]);
2501 #endif
2502         }
2503 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2504         if(ok && encoder->protected_->max_lpc_order > 0) {
2505                 for(i = 0; ok && i < encoder->protected_->num_apodizations; i++)
2506                         ok = ok && FLAC__memory_alloc_aligned_real_array(new_blocksize, &encoder->private_->window_unaligned[i], &encoder->private_->window[i]);
2507                 ok = ok && FLAC__memory_alloc_aligned_real_array(new_blocksize, &encoder->private_->windowed_signal_unaligned, &encoder->private_->windowed_signal);
2508         }
2509 #endif
2510         for(channel = 0; ok && channel < encoder->protected_->channels; channel++) {
2511                 for(i = 0; ok && i < 2; i++) {
2512                         ok = ok && FLAC__memory_alloc_aligned_int32_array(new_blocksize, &encoder->private_->residual_workspace_unaligned[channel][i], &encoder->private_->residual_workspace[channel][i]);
2513                 }
2514         }
2515         for(channel = 0; ok && channel < 2; channel++) {
2516                 for(i = 0; ok && i < 2; i++) {
2517                         ok = ok && FLAC__memory_alloc_aligned_int32_array(new_blocksize, &encoder->private_->residual_workspace_mid_side_unaligned[channel][i], &encoder->private_->residual_workspace_mid_side[channel][i]);
2518                 }
2519         }
2520         /* the *2 is an approximation to the series 1 + 1/2 + 1/4 + ... that sums tree occupies in a flat array */
2521         /*@@@ new_blocksize*2 is too pessimistic, but to fix, we need smarter logic because a smaller new_blocksize can actually increase the # of partitions; would require moving this out into a separate function, then checking its capacity against the need of the current blocksize&min/max_partition_order (and maybe predictor order) */
2522         ok = ok && FLAC__memory_alloc_aligned_uint64_array(new_blocksize * 2, &encoder->private_->abs_residual_partition_sums_unaligned, &encoder->private_->abs_residual_partition_sums);
2523         if(encoder->protected_->do_escape_coding)
2524                 ok = ok && FLAC__memory_alloc_aligned_unsigned_array(new_blocksize * 2, &encoder->private_->raw_bits_per_partition_unaligned, &encoder->private_->raw_bits_per_partition);
2525
2526         /* now adjust the windows if the blocksize has changed */
2527 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2528         if(ok && new_blocksize != encoder->private_->input_capacity && encoder->protected_->max_lpc_order > 0) {
2529                 for(i = 0; ok && i < encoder->protected_->num_apodizations; i++) {
2530                         switch(encoder->protected_->apodizations[i].type) {
2531                                 case FLAC__APODIZATION_BARTLETT:
2532                                         FLAC__window_bartlett(encoder->private_->window[i], new_blocksize);
2533                                         break;
2534                                 case FLAC__APODIZATION_BARTLETT_HANN:
2535                                         FLAC__window_bartlett_hann(encoder->private_->window[i], new_blocksize);
2536                                         break;
2537                                 case FLAC__APODIZATION_BLACKMAN:
2538                                         FLAC__window_blackman(encoder->private_->window[i], new_blocksize);
2539                                         break;
2540                                 case FLAC__APODIZATION_BLACKMAN_HARRIS_4TERM_92DB_SIDELOBE:
2541                                         FLAC__window_blackman_harris_4term_92db_sidelobe(encoder->private_->window[i], new_blocksize);
2542                                         break;
2543                                 case FLAC__APODIZATION_CONNES:
2544                                         FLAC__window_connes(encoder->private_->window[i], new_blocksize);
2545                                         break;
2546                                 case FLAC__APODIZATION_FLATTOP:
2547                                         FLAC__window_flattop(encoder->private_->window[i], new_blocksize);
2548                                         break;
2549                                 case FLAC__APODIZATION_GAUSS:
2550                                         FLAC__window_gauss(encoder->private_->window[i], new_blocksize, encoder->protected_->apodizations[i].parameters.gauss.stddev);
2551                                         break;
2552                                 case FLAC__APODIZATION_HAMMING:
2553                                         FLAC__window_hamming(encoder->private_->window[i], new_blocksize);
2554                                         break;
2555                                 case FLAC__APODIZATION_HANN:
2556                                         FLAC__window_hann(encoder->private_->window[i], new_blocksize);
2557                                         break;
2558                                 case FLAC__APODIZATION_KAISER_BESSEL:
2559                                         FLAC__window_kaiser_bessel(encoder->private_->window[i], new_blocksize);
2560                                         break;
2561                                 case FLAC__APODIZATION_NUTTALL:
2562                                         FLAC__window_nuttall(encoder->private_->window[i], new_blocksize);
2563                                         break;
2564                                 case FLAC__APODIZATION_RECTANGLE:
2565                                         FLAC__window_rectangle(encoder->private_->window[i], new_blocksize);
2566                                         break;
2567                                 case FLAC__APODIZATION_TRIANGLE:
2568                                         FLAC__window_triangle(encoder->private_->window[i], new_blocksize);
2569                                         break;
2570                                 case FLAC__APODIZATION_TUKEY:
2571                                         FLAC__window_tukey(encoder->private_->window[i], new_blocksize, encoder->protected_->apodizations[i].parameters.tukey.p);
2572                                         break;
2573                                 case FLAC__APODIZATION_WELCH:
2574                                         FLAC__window_welch(encoder->private_->window[i], new_blocksize);
2575                                         break;
2576                                 default:
2577                                         FLAC__ASSERT(0);
2578                                         /* double protection */
2579                                         FLAC__window_hann(encoder->private_->window[i], new_blocksize);
2580                                         break;
2581                         }
2582                 }
2583         }
2584 #endif
2585
2586         if(ok)
2587                 encoder->private_->input_capacity = new_blocksize;
2588         else
2589                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
2590
2591         return ok;
2592 }
2593
2594 FLAC__bool write_bitbuffer_(FLAC__StreamEncoder *encoder, unsigned samples, FLAC__bool is_last_block)
2595 {
2596         const FLAC__byte *buffer;
2597         size_t bytes;
2598
2599         FLAC__ASSERT(FLAC__bitwriter_is_byte_aligned(encoder->private_->frame));
2600
2601         if(!FLAC__bitwriter_get_buffer(encoder->private_->frame, &buffer, &bytes)) {
2602                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
2603                 return false;
2604         }
2605
2606         if(encoder->protected_->verify) {
2607                 encoder->private_->verify.output.data = buffer;
2608                 encoder->private_->verify.output.bytes = bytes;
2609                 if(encoder->private_->verify.state_hint == ENCODER_IN_MAGIC) {
2610                         encoder->private_->verify.needs_magic_hack = true;
2611                 }
2612                 else {
2613                         if(!FLAC__stream_decoder_process_single(encoder->private_->verify.decoder)) {
2614                                 FLAC__bitwriter_release_buffer(encoder->private_->frame);
2615                                 FLAC__bitwriter_clear(encoder->private_->frame);
2616                                 if(encoder->protected_->state != FLAC__STREAM_ENCODER_VERIFY_MISMATCH_IN_AUDIO_DATA)
2617                                         encoder->protected_->state = FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR;
2618                                 return false;
2619                         }
2620                 }
2621         }
2622
2623         if(write_frame_(encoder, buffer, bytes, samples, is_last_block) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) {
2624                 FLAC__bitwriter_release_buffer(encoder->private_->frame);
2625                 FLAC__bitwriter_clear(encoder->private_->frame);
2626                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2627                 return false;
2628         }
2629
2630         FLAC__bitwriter_release_buffer(encoder->private_->frame);
2631         FLAC__bitwriter_clear(encoder->private_->frame);
2632
2633         if(samples > 0) {
2634                 encoder->private_->streaminfo.data.stream_info.min_framesize = min(bytes, encoder->private_->streaminfo.data.stream_info.min_framesize);
2635                 encoder->private_->streaminfo.data.stream_info.max_framesize = max(bytes, encoder->private_->streaminfo.data.stream_info.max_framesize);
2636         }
2637
2638         return true;
2639 }
2640
2641 FLAC__StreamEncoderWriteStatus write_frame_(FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], size_t bytes, unsigned samples, FLAC__bool is_last_block)
2642 {
2643         FLAC__StreamEncoderWriteStatus status;
2644         FLAC__uint64 output_position = 0;
2645
2646         /* FLAC__STREAM_ENCODER_TELL_STATUS_UNSUPPORTED just means we didn't get the offset; no error */
2647         if(encoder->private_->tell_callback && encoder->private_->tell_callback(encoder, &output_position, encoder->private_->client_data) == FLAC__STREAM_ENCODER_TELL_STATUS_ERROR) {
2648                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2649                 return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;
2650         }
2651
2652         /*
2653          * Watch for the STREAMINFO block and first SEEKTABLE block to go by and store their offsets.
2654          */
2655         if(samples == 0) {
2656                 FLAC__MetadataType type = (buffer[0] & 0x7f);
2657                 if(type == FLAC__METADATA_TYPE_STREAMINFO)
2658                         encoder->protected_->streaminfo_offset = output_position;
2659                 else if(type == FLAC__METADATA_TYPE_SEEKTABLE && encoder->protected_->seektable_offset == 0)
2660                         encoder->protected_->seektable_offset = output_position;
2661         }
2662
2663         /*
2664          * Mark the current seek point if hit (if audio_offset == 0 that
2665          * means we're still writing metadata and haven't hit the first
2666          * frame yet)
2667          */
2668         if(0 != encoder->private_->seek_table && encoder->protected_->audio_offset > 0 && encoder->private_->seek_table->num_points > 0) {
2669                 const unsigned blocksize = FLAC__stream_encoder_get_blocksize(encoder);
2670                 const FLAC__uint64 frame_first_sample = encoder->private_->samples_written;
2671                 const FLAC__uint64 frame_last_sample = frame_first_sample + (FLAC__uint64)blocksize - 1;
2672                 FLAC__uint64 test_sample;
2673                 unsigned i;
2674                 for(i = encoder->private_->first_seekpoint_to_check; i < encoder->private_->seek_table->num_points; i++) {
2675                         test_sample = encoder->private_->seek_table->points[i].sample_number;
2676                         if(test_sample > frame_last_sample) {
2677                                 break;
2678                         }
2679                         else if(test_sample >= frame_first_sample) {
2680                                 encoder->private_->seek_table->points[i].sample_number = frame_first_sample;
2681                                 encoder->private_->seek_table->points[i].stream_offset = output_position - encoder->protected_->audio_offset;
2682                                 encoder->private_->seek_table->points[i].frame_samples = blocksize;
2683                                 encoder->private_->first_seekpoint_to_check++;
2684                                 /* DO NOT: "break;" and here's why:
2685                                  * The seektable template may contain more than one target
2686                                  * sample for any given frame; we will keep looping, generating
2687                                  * duplicate seekpoints for them, and we'll clean it up later,
2688                                  * just before writing the seektable back to the metadata.
2689                                  */
2690                         }
2691                         else {
2692                                 encoder->private_->first_seekpoint_to_check++;
2693                         }
2694                 }
2695         }
2696
2697 #if FLAC__HAS_OGG
2698         if(encoder->private_->is_ogg) {
2699                 status = FLAC__ogg_encoder_aspect_write_callback_wrapper(
2700                         &encoder->protected_->ogg_encoder_aspect,
2701                         buffer,
2702                         bytes,
2703                         samples,
2704                         encoder->private_->current_frame_number,
2705                         is_last_block,
2706                         (FLAC__OggEncoderAspectWriteCallbackProxy)encoder->private_->write_callback,
2707                         encoder,
2708                         encoder->private_->client_data
2709                 );
2710         }
2711         else
2712 #endif
2713         status = encoder->private_->write_callback(encoder, buffer, bytes, samples, encoder->private_->current_frame_number, encoder->private_->client_data);
2714
2715         if(status == FLAC__STREAM_ENCODER_WRITE_STATUS_OK) {
2716                 encoder->private_->bytes_written += bytes;
2717                 encoder->private_->samples_written += samples;
2718                 /* we keep a high watermark on the number of frames written because
2719                  * when the encoder goes back to write metadata, 'current_frame'
2720                  * will drop back to 0.
2721                  */
2722                 encoder->private_->frames_written = max(encoder->private_->frames_written, encoder->private_->current_frame_number+1);
2723         }
2724         else
2725                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2726
2727         return status;
2728 }
2729
2730 /* Gets called when the encoding process has finished so that we can update the STREAMINFO and SEEKTABLE blocks.  */
2731 void update_metadata_(const FLAC__StreamEncoder *encoder)
2732 {
2733         FLAC__byte b[max(6, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)];
2734         const FLAC__StreamMetadata *metadata = &encoder->private_->streaminfo;
2735         const FLAC__uint64 samples = metadata->data.stream_info.total_samples;
2736         const unsigned min_framesize = metadata->data.stream_info.min_framesize;
2737         const unsigned max_framesize = metadata->data.stream_info.max_framesize;
2738         const unsigned bps = metadata->data.stream_info.bits_per_sample;
2739         FLAC__StreamEncoderSeekStatus seek_status;
2740
2741         FLAC__ASSERT(metadata->type == FLAC__METADATA_TYPE_STREAMINFO);
2742
2743         /* All this is based on intimate knowledge of the stream header
2744          * layout, but a change to the header format that would break this
2745          * would also break all streams encoded in the previous format.
2746          */
2747
2748         /*
2749          * Write MD5 signature
2750          */
2751         {
2752                 const unsigned md5_offset =
2753                         FLAC__STREAM_METADATA_HEADER_LENGTH +
2754                         (
2755                                 FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN +
2756                                 FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN +
2757                                 FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN +
2758                                 FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN +
2759                                 FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN +
2760                                 FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN +
2761                                 FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN +
2762                                 FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN
2763                         ) / 8;
2764
2765                 if((seek_status = encoder->private_->seek_callback(encoder, encoder->protected_->streaminfo_offset + md5_offset, encoder->private_->client_data)) != FLAC__STREAM_ENCODER_SEEK_STATUS_OK) {
2766                         if(seek_status == FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR)
2767                                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2768                         return;
2769                 }
2770                 if(encoder->private_->write_callback(encoder, metadata->data.stream_info.md5sum, 16, 0, 0, encoder->private_->client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) {
2771                         encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2772                         return;
2773                 }
2774         }
2775
2776         /*
2777          * Write total samples
2778          */
2779         {
2780                 const unsigned total_samples_byte_offset =
2781                         FLAC__STREAM_METADATA_HEADER_LENGTH +
2782                         (
2783                                 FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN +
2784                                 FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN +
2785                                 FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN +
2786                                 FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN +
2787                                 FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN +
2788                                 FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN +
2789                                 FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN
2790                                 - 4
2791                         ) / 8;
2792
2793                 b[0] = ((FLAC__byte)(bps-1) << 4) | (FLAC__byte)((samples >> 32) & 0x0F);
2794                 b[1] = (FLAC__byte)((samples >> 24) & 0xFF);
2795                 b[2] = (FLAC__byte)((samples >> 16) & 0xFF);
2796                 b[3] = (FLAC__byte)((samples >> 8) & 0xFF);
2797                 b[4] = (FLAC__byte)(samples & 0xFF);
2798                 if((seek_status = encoder->private_->seek_callback(encoder, encoder->protected_->streaminfo_offset + total_samples_byte_offset, encoder->private_->client_data)) != FLAC__STREAM_ENCODER_SEEK_STATUS_OK) {
2799                         if(seek_status == FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR)
2800                                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2801                         return;
2802                 }
2803                 if(encoder->private_->write_callback(encoder, b, 5, 0, 0, encoder->private_->client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) {
2804                         encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2805                         return;
2806                 }
2807         }
2808
2809         /*
2810          * Write min/max framesize
2811          */
2812         {
2813                 const unsigned min_framesize_offset =
2814                         FLAC__STREAM_METADATA_HEADER_LENGTH +
2815                         (
2816                                 FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN +
2817                                 FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN
2818                         ) / 8;
2819
2820                 b[0] = (FLAC__byte)((min_framesize >> 16) & 0xFF);
2821                 b[1] = (FLAC__byte)((min_framesize >> 8) & 0xFF);
2822                 b[2] = (FLAC__byte)(min_framesize & 0xFF);
2823                 b[3] = (FLAC__byte)((max_framesize >> 16) & 0xFF);
2824                 b[4] = (FLAC__byte)((max_framesize >> 8) & 0xFF);
2825                 b[5] = (FLAC__byte)(max_framesize & 0xFF);
2826                 if((seek_status = encoder->private_->seek_callback(encoder, encoder->protected_->streaminfo_offset + min_framesize_offset, encoder->private_->client_data)) != FLAC__STREAM_ENCODER_SEEK_STATUS_OK) {
2827                         if(seek_status == FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR)
2828                                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2829                         return;
2830                 }
2831                 if(encoder->private_->write_callback(encoder, b, 6, 0, 0, encoder->private_->client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) {
2832                         encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2833                         return;
2834                 }
2835         }
2836
2837         /*
2838          * Write seektable
2839          */
2840         if(0 != encoder->private_->seek_table && encoder->private_->seek_table->num_points > 0 && encoder->protected_->seektable_offset > 0) {
2841                 unsigned i;
2842
2843                 FLAC__format_seektable_sort(encoder->private_->seek_table);
2844
2845                 FLAC__ASSERT(FLAC__format_seektable_is_legal(encoder->private_->seek_table));
2846
2847                 if((seek_status = encoder->private_->seek_callback(encoder, encoder->protected_->seektable_offset + FLAC__STREAM_METADATA_HEADER_LENGTH, encoder->private_->client_data)) != FLAC__STREAM_ENCODER_SEEK_STATUS_OK) {
2848                         if(seek_status == FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR)
2849                                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2850                         return;
2851                 }
2852
2853                 for(i = 0; i < encoder->private_->seek_table->num_points; i++) {
2854                         FLAC__uint64 xx;
2855                         unsigned x;
2856                         xx = encoder->private_->seek_table->points[i].sample_number;
2857                         b[7] = (FLAC__byte)xx; xx >>= 8;
2858                         b[6] = (FLAC__byte)xx; xx >>= 8;
2859                         b[5] = (FLAC__byte)xx; xx >>= 8;
2860                         b[4] = (FLAC__byte)xx; xx >>= 8;
2861                         b[3] = (FLAC__byte)xx; xx >>= 8;
2862                         b[2] = (FLAC__byte)xx; xx >>= 8;
2863                         b[1] = (FLAC__byte)xx; xx >>= 8;
2864                         b[0] = (FLAC__byte)xx; xx >>= 8;
2865                         xx = encoder->private_->seek_table->points[i].stream_offset;
2866                         b[15] = (FLAC__byte)xx; xx >>= 8;
2867                         b[14] = (FLAC__byte)xx; xx >>= 8;
2868                         b[13] = (FLAC__byte)xx; xx >>= 8;
2869                         b[12] = (FLAC__byte)xx; xx >>= 8;
2870                         b[11] = (FLAC__byte)xx; xx >>= 8;
2871                         b[10] = (FLAC__byte)xx; xx >>= 8;
2872                         b[9] = (FLAC__byte)xx; xx >>= 8;
2873                         b[8] = (FLAC__byte)xx; xx >>= 8;
2874                         x = encoder->private_->seek_table->points[i].frame_samples;
2875                         b[17] = (FLAC__byte)x; x >>= 8;
2876                         b[16] = (FLAC__byte)x; x >>= 8;
2877                         if(encoder->private_->write_callback(encoder, b, 18, 0, 0, encoder->private_->client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) {
2878                                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2879                                 return;
2880                         }
2881                 }
2882         }
2883 }
2884
2885 #if FLAC__HAS_OGG
2886 /* Gets called when the encoding process has finished so that we can update the STREAMINFO and SEEKTABLE blocks.  */
2887 void update_ogg_metadata_(FLAC__StreamEncoder *encoder)
2888 {
2889         /* the # of bytes in the 1st packet that precede the STREAMINFO */
2890         static const unsigned FIRST_OGG_PACKET_STREAMINFO_PREFIX_LENGTH =
2891                 FLAC__OGG_MAPPING_PACKET_TYPE_LENGTH +
2892                 FLAC__OGG_MAPPING_MAGIC_LENGTH +
2893                 FLAC__OGG_MAPPING_VERSION_MAJOR_LENGTH +
2894                 FLAC__OGG_MAPPING_VERSION_MINOR_LENGTH +
2895                 FLAC__OGG_MAPPING_NUM_HEADERS_LENGTH +
2896                 FLAC__STREAM_SYNC_LENGTH
2897         ;
2898         FLAC__byte b[max(6, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)];
2899         const FLAC__StreamMetadata *metadata = &encoder->private_->streaminfo;
2900         const FLAC__uint64 samples = metadata->data.stream_info.total_samples;
2901         const unsigned min_framesize = metadata->data.stream_info.min_framesize;
2902         const unsigned max_framesize = metadata->data.stream_info.max_framesize;
2903         ogg_page page;
2904
2905         FLAC__ASSERT(metadata->type == FLAC__METADATA_TYPE_STREAMINFO);
2906         FLAC__ASSERT(0 != encoder->private_->seek_callback);
2907
2908         /* Pre-check that client supports seeking, since we don't want the
2909          * ogg_helper code to ever have to deal with this condition.
2910          */
2911         if(encoder->private_->seek_callback(encoder, 0, encoder->private_->client_data) == FLAC__STREAM_ENCODER_SEEK_STATUS_UNSUPPORTED)
2912                 return;
2913
2914         /* All this is based on intimate knowledge of the stream header
2915          * layout, but a change to the header format that would break this
2916          * would also break all streams encoded in the previous format.
2917          */
2918
2919         /**
2920          ** Write STREAMINFO stats
2921          **/
2922         simple_ogg_page__init(&page);
2923         if(!simple_ogg_page__get_at(encoder, encoder->protected_->streaminfo_offset, &page, encoder->private_->seek_callback, encoder->private_->read_callback, encoder->private_->client_data)) {
2924                 simple_ogg_page__clear(&page);
2925                 return; /* state already set */
2926         }
2927
2928         /*
2929          * Write MD5 signature
2930          */
2931         {
2932                 const unsigned md5_offset =
2933                         FIRST_OGG_PACKET_STREAMINFO_PREFIX_LENGTH +
2934                         FLAC__STREAM_METADATA_HEADER_LENGTH +
2935                         (
2936                                 FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN +
2937                                 FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN +
2938                                 FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN +
2939                                 FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN +
2940                                 FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN +
2941                                 FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN +
2942                                 FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN +
2943                                 FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN
2944                         ) / 8;
2945
2946                 if(md5_offset + 16 > (unsigned)page.body_len) {
2947                         encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
2948                         simple_ogg_page__clear(&page);
2949                         return;
2950                 }
2951                 memcpy(page.body + md5_offset, metadata->data.stream_info.md5sum, 16);
2952         }
2953
2954         /*
2955          * Write total samples
2956          */
2957         {
2958                 const unsigned total_samples_byte_offset =
2959                         FIRST_OGG_PACKET_STREAMINFO_PREFIX_LENGTH +
2960                         FLAC__STREAM_METADATA_HEADER_LENGTH +
2961                         (
2962                                 FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN +
2963                                 FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN +
2964                                 FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN +
2965                                 FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN +
2966                                 FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN +
2967                                 FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN +
2968                                 FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN
2969                                 - 4
2970                         ) / 8;
2971
2972                 if(total_samples_byte_offset + 5 > (unsigned)page.body_len) {
2973                         encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
2974                         simple_ogg_page__clear(&page);
2975                         return;
2976                 }
2977                 b[0] = (FLAC__byte)page.body[total_samples_byte_offset] & 0xF0;
2978                 b[0] |= (FLAC__byte)((samples >> 32) & 0x0F);
2979                 b[1] = (FLAC__byte)((samples >> 24) & 0xFF);
2980                 b[2] = (FLAC__byte)((samples >> 16) & 0xFF);
2981                 b[3] = (FLAC__byte)((samples >> 8) & 0xFF);
2982                 b[4] = (FLAC__byte)(samples & 0xFF);
2983                 memcpy(page.body + total_samples_byte_offset, b, 5);
2984         }
2985
2986         /*
2987          * Write min/max framesize
2988          */
2989         {
2990                 const unsigned min_framesize_offset =
2991                         FIRST_OGG_PACKET_STREAMINFO_PREFIX_LENGTH +
2992                         FLAC__STREAM_METADATA_HEADER_LENGTH +
2993                         (
2994                                 FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN +
2995                                 FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN
2996                         ) / 8;
2997
2998                 if(min_framesize_offset + 6 > (unsigned)page.body_len) {
2999                         encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
3000                         simple_ogg_page__clear(&page);
3001                         return;
3002                 }
3003                 b[0] = (FLAC__byte)((min_framesize >> 16) & 0xFF);
3004                 b[1] = (FLAC__byte)((min_framesize >> 8) & 0xFF);
3005                 b[2] = (FLAC__byte)(min_framesize & 0xFF);
3006                 b[3] = (FLAC__byte)((max_framesize >> 16) & 0xFF);
3007                 b[4] = (FLAC__byte)((max_framesize >> 8) & 0xFF);
3008                 b[5] = (FLAC__byte)(max_framesize & 0xFF);
3009                 memcpy(page.body + min_framesize_offset, b, 6);
3010         }
3011         if(!simple_ogg_page__set_at(encoder, encoder->protected_->streaminfo_offset, &page, encoder->private_->seek_callback, encoder->private_->write_callback, encoder->private_->client_data)) {
3012                 simple_ogg_page__clear(&page);
3013                 return; /* state already set */
3014         }
3015         simple_ogg_page__clear(&page);
3016
3017         /*
3018          * Write seektable
3019          */
3020         if(0 != encoder->private_->seek_table && encoder->private_->seek_table->num_points > 0 && encoder->protected_->seektable_offset > 0) {
3021                 unsigned i;
3022                 FLAC__byte *p;
3023
3024                 FLAC__format_seektable_sort(encoder->private_->seek_table);
3025
3026                 FLAC__ASSERT(FLAC__format_seektable_is_legal(encoder->private_->seek_table));
3027
3028                 simple_ogg_page__init(&page);
3029                 if(!simple_ogg_page__get_at(encoder, encoder->protected_->seektable_offset, &page, encoder->private_->seek_callback, encoder->private_->read_callback, encoder->private_->client_data)) {
3030                         simple_ogg_page__clear(&page);
3031                         return; /* state already set */
3032                 }
3033
3034                 if((FLAC__STREAM_METADATA_HEADER_LENGTH + 18*encoder->private_->seek_table->num_points) != (unsigned)page.body_len) {
3035                         encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
3036                         simple_ogg_page__clear(&page);
3037                         return;
3038                 }
3039
3040                 for(i = 0, p = page.body + FLAC__STREAM_METADATA_HEADER_LENGTH; i < encoder->private_->seek_table->num_points; i++, p += 18) {
3041                         FLAC__uint64 xx;
3042                         unsigned x;
3043                         xx = encoder->private_->seek_table->points[i].sample_number;
3044                         b[7] = (FLAC__byte)xx; xx >>= 8;
3045                         b[6] = (FLAC__byte)xx; xx >>= 8;
3046                         b[5] = (FLAC__byte)xx; xx >>= 8;
3047                         b[4] = (FLAC__byte)xx; xx >>= 8;
3048                         b[3] = (FLAC__byte)xx; xx >>= 8;
3049                         b[2] = (FLAC__byte)xx; xx >>= 8;
3050                         b[1] = (FLAC__byte)xx; xx >>= 8;
3051                         b[0] = (FLAC__byte)xx; xx >>= 8;
3052                         xx = encoder->private_->seek_table->points[i].stream_offset;
3053                         b[15] = (FLAC__byte)xx; xx >>= 8;
3054                         b[14] = (FLAC__byte)xx; xx >>= 8;
3055                         b[13] = (FLAC__byte)xx; xx >>= 8;
3056                         b[12] = (FLAC__byte)xx; xx >>= 8;
3057                         b[11] = (FLAC__byte)xx; xx >>= 8;
3058                         b[10] = (FLAC__byte)xx; xx >>= 8;
3059                         b[9] = (FLAC__byte)xx; xx >>= 8;
3060                         b[8] = (FLAC__byte)xx; xx >>= 8;
3061                         x = encoder->private_->seek_table->points[i].frame_samples;
3062                         b[17] = (FLAC__byte)x; x >>= 8;
3063                         b[16] = (FLAC__byte)x; x >>= 8;
3064                         memcpy(p, b, 18);
3065                 }
3066
3067                 if(!simple_ogg_page__set_at(encoder, encoder->protected_->seektable_offset, &page, encoder->private_->seek_callback, encoder->private_->write_callback, encoder->private_->client_data)) {
3068                         simple_ogg_page__clear(&page);
3069                         return; /* state already set */
3070                 }
3071                 simple_ogg_page__clear(&page);
3072         }
3073 }
3074 #endif
3075
3076 FLAC__bool process_frame_(FLAC__StreamEncoder *encoder, FLAC__bool is_fractional_block, FLAC__bool is_last_block)
3077 {
3078         FLAC__uint16 crc;
3079         FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
3080
3081         /*
3082          * Accumulate raw signal to the MD5 signature
3083          */
3084         if(!FLAC__MD5Accumulate(&encoder->private_->md5context, (const FLAC__int32 * const *)encoder->private_->integer_signal, encoder->protected_->channels, encoder->protected_->blocksize, (encoder->protected_->bits_per_sample+7) / 8)) {
3085                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
3086                 return false;
3087         }
3088
3089         /*
3090          * Process the frame header and subframes into the frame bitbuffer
3091          */
3092         if(!process_subframes_(encoder, is_fractional_block)) {
3093                 /* the above function sets the state for us in case of an error */
3094                 return false;
3095         }
3096
3097         /*
3098          * Zero-pad the frame to a byte_boundary
3099          */
3100         if(!FLAC__bitwriter_zero_pad_to_byte_boundary(encoder->private_->frame)) {
3101                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
3102                 return false;
3103         }
3104
3105         /*
3106          * CRC-16 the whole thing
3107          */
3108         FLAC__ASSERT(FLAC__bitwriter_is_byte_aligned(encoder->private_->frame));
3109         if(
3110                 !FLAC__bitwriter_get_write_crc16(encoder->private_->frame, &crc) ||
3111                 !FLAC__bitwriter_write_raw_uint32(encoder->private_->frame, crc, FLAC__FRAME_FOOTER_CRC_LEN)
3112         ) {
3113                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
3114                 return false;
3115         }
3116
3117         /*
3118          * Write it
3119          */
3120         if(!write_bitbuffer_(encoder, encoder->protected_->blocksize, is_last_block)) {
3121                 /* the above function sets the state for us in case of an error */
3122                 return false;
3123         }
3124
3125         /*
3126          * Get ready for the next frame
3127          */
3128         encoder->private_->current_sample_number = 0;
3129         encoder->private_->current_frame_number++;
3130         encoder->private_->streaminfo.data.stream_info.total_samples += (FLAC__uint64)encoder->protected_->blocksize;
3131
3132         return true;
3133 }
3134
3135 FLAC__bool process_subframes_(FLAC__StreamEncoder *encoder, FLAC__bool is_fractional_block)
3136 {
3137         FLAC__FrameHeader frame_header;
3138         unsigned channel, min_partition_order = encoder->protected_->min_residual_partition_order, max_partition_order;
3139         FLAC__bool do_independent, do_mid_side;
3140
3141         /*
3142          * Calculate the min,max Rice partition orders
3143          */
3144         if(is_fractional_block) {
3145                 max_partition_order = 0;
3146         }
3147         else {
3148                 max_partition_order = FLAC__format_get_max_rice_partition_order_from_blocksize(encoder->protected_->blocksize);
3149                 max_partition_order = min(max_partition_order, encoder->protected_->max_residual_partition_order);
3150         }
3151         min_partition_order = min(min_partition_order, max_partition_order);
3152
3153         /*
3154          * Setup the frame
3155          */
3156         frame_header.blocksize = encoder->protected_->blocksize;
3157         frame_header.sample_rate = encoder->protected_->sample_rate;
3158         frame_header.channels = encoder->protected_->channels;
3159         frame_header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT; /* the default unless the encoder determines otherwise */
3160         frame_header.bits_per_sample = encoder->protected_->bits_per_sample;
3161         frame_header.number_type = FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER;
3162         frame_header.number.frame_number = encoder->private_->current_frame_number;
3163
3164         /*
3165          * Figure out what channel assignments to try
3166          */
3167         if(encoder->protected_->do_mid_side_stereo) {
3168                 if(encoder->protected_->loose_mid_side_stereo) {
3169                         if(encoder->private_->loose_mid_side_stereo_frame_count == 0) {
3170                                 do_independent = true;
3171                                 do_mid_side = true;
3172                         }
3173                         else {
3174                                 do_independent = (encoder->private_->last_channel_assignment == FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT);
3175                                 do_mid_side = !do_independent;
3176                         }
3177                 }
3178                 else {
3179                         do_independent = true;
3180                         do_mid_side = true;
3181                 }
3182         }
3183         else {
3184                 do_independent = true;
3185                 do_mid_side = false;
3186         }
3187
3188         FLAC__ASSERT(do_independent || do_mid_side);
3189
3190         /*
3191          * Check for wasted bits; set effective bps for each subframe
3192          */
3193         if(do_independent) {
3194                 for(channel = 0; channel < encoder->protected_->channels; channel++) {
3195                         const unsigned w = get_wasted_bits_(encoder->private_->integer_signal[channel], encoder->protected_->blocksize);
3196                         encoder->private_->subframe_workspace[channel][0].wasted_bits = encoder->private_->subframe_workspace[channel][1].wasted_bits = w;
3197                         encoder->private_->subframe_bps[channel] = encoder->protected_->bits_per_sample - w;
3198                 }
3199         }
3200         if(do_mid_side) {
3201                 FLAC__ASSERT(encoder->protected_->channels == 2);
3202                 for(channel = 0; channel < 2; channel++) {
3203                         const unsigned w = get_wasted_bits_(encoder->private_->integer_signal_mid_side[channel], encoder->protected_->blocksize);
3204                         encoder->private_->subframe_workspace_mid_side[channel][0].wasted_bits = encoder->private_->subframe_workspace_mid_side[channel][1].wasted_bits = w;
3205                         encoder->private_->subframe_bps_mid_side[channel] = encoder->protected_->bits_per_sample - w + (channel==0? 0:1);
3206                 }
3207         }
3208
3209         /*
3210          * First do a normal encoding pass of each independent channel
3211          */
3212         if(do_independent) {
3213                 for(channel = 0; channel < encoder->protected_->channels; channel++) {
3214                         if(!
3215                                 process_subframe_(
3216                                         encoder,
3217                                         min_partition_order,
3218                                         max_partition_order,
3219                                         &frame_header,
3220                                         encoder->private_->subframe_bps[channel],
3221                                         encoder->private_->integer_signal[channel],
3222 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3223                                         encoder->private_->real_signal[channel],
3224 #endif
3225                                         encoder->private_->subframe_workspace_ptr[channel],
3226                                         encoder->private_->partitioned_rice_contents_workspace_ptr[channel],
3227                                         encoder->private_->residual_workspace[channel],
3228                                         encoder->private_->best_subframe+channel,
3229                                         encoder->private_->best_subframe_bits+channel
3230                                 )
3231                         )
3232                                 return false;
3233                 }
3234         }
3235
3236         /*
3237          * Now do mid and side channels if requested
3238          */
3239         if(do_mid_side) {
3240                 FLAC__ASSERT(encoder->protected_->channels == 2);
3241
3242                 for(channel = 0; channel < 2; channel++) {
3243                         if(!
3244                                 process_subframe_(
3245                                         encoder,
3246                                         min_partition_order,
3247                                         max_partition_order,
3248                                         &frame_header,
3249                                         encoder->private_->subframe_bps_mid_side[channel],
3250                                         encoder->private_->integer_signal_mid_side[channel],
3251 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3252                                         encoder->private_->real_signal_mid_side[channel],
3253 #endif
3254                                         encoder->private_->subframe_workspace_ptr_mid_side[channel],
3255                                         encoder->private_->partitioned_rice_contents_workspace_ptr_mid_side[channel],
3256                                         encoder->private_->residual_workspace_mid_side[channel],
3257                                         encoder->private_->best_subframe_mid_side+channel,
3258                                         encoder->private_->best_subframe_bits_mid_side+channel
3259                                 )
3260                         )
3261                                 return false;
3262                 }
3263         }
3264
3265         /*
3266          * Compose the frame bitbuffer
3267          */
3268         if(do_mid_side) {
3269                 unsigned left_bps = 0, right_bps = 0; /* initialized only to prevent superfluous compiler warning */
3270                 FLAC__Subframe *left_subframe = 0, *right_subframe = 0; /* initialized only to prevent superfluous compiler warning */
3271                 FLAC__ChannelAssignment channel_assignment;
3272
3273                 FLAC__ASSERT(encoder->protected_->channels == 2);
3274
3275                 if(encoder->protected_->loose_mid_side_stereo && encoder->private_->loose_mid_side_stereo_frame_count > 0) {
3276                         channel_assignment = (encoder->private_->last_channel_assignment == FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT? FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT : FLAC__CHANNEL_ASSIGNMENT_MID_SIDE);
3277                 }
3278                 else {
3279                         unsigned bits[4]; /* WATCHOUT - indexed by FLAC__ChannelAssignment */
3280                         unsigned min_bits;
3281                         int ca;
3282
3283                         FLAC__ASSERT(FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT == 0);
3284                         FLAC__ASSERT(FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE   == 1);
3285                         FLAC__ASSERT(FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE  == 2);
3286                         FLAC__ASSERT(FLAC__CHANNEL_ASSIGNMENT_MID_SIDE    == 3);
3287                         FLAC__ASSERT(do_independent && do_mid_side);
3288
3289                         /* We have to figure out which channel assignent results in the smallest frame */
3290                         bits[FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT] = encoder->private_->best_subframe_bits         [0] + encoder->private_->best_subframe_bits         [1];
3291                         bits[FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE  ] = encoder->private_->best_subframe_bits         [0] + encoder->private_->best_subframe_bits_mid_side[1];
3292                         bits[FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE ] = encoder->private_->best_subframe_bits         [1] + encoder->private_->best_subframe_bits_mid_side[1];
3293                         bits[FLAC__CHANNEL_ASSIGNMENT_MID_SIDE   ] = encoder->private_->best_subframe_bits_mid_side[0] + encoder->private_->best_subframe_bits_mid_side[1];
3294
3295                         channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT;
3296                         min_bits = bits[channel_assignment];
3297                         for(ca = 1; ca <= 3; ca++) {
3298                                 if(bits[ca] < min_bits) {
3299                                         min_bits = bits[ca];
3300                                         channel_assignment = (FLAC__ChannelAssignment)ca;
3301                                 }
3302                         }
3303                 }
3304
3305                 frame_header.channel_assignment = channel_assignment;
3306
3307                 if(!FLAC__frame_add_header(&frame_header, encoder->private_->frame)) {
3308                         encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
3309                         return false;
3310                 }
3311
3312                 switch(channel_assignment) {
3313                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
3314                                 left_subframe  = &encoder->private_->subframe_workspace         [0][encoder->private_->best_subframe         [0]];
3315                                 right_subframe = &encoder->private_->subframe_workspace         [1][encoder->private_->best_subframe         [1]];
3316                                 break;
3317                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
3318                                 left_subframe  = &encoder->private_->subframe_workspace         [0][encoder->private_->best_subframe         [0]];
3319                                 right_subframe = &encoder->private_->subframe_workspace_mid_side[1][encoder->private_->best_subframe_mid_side[1]];
3320                                 break;
3321                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
3322                                 left_subframe  = &encoder->private_->subframe_workspace_mid_side[1][encoder->private_->best_subframe_mid_side[1]];
3323                                 right_subframe = &encoder->private_->subframe_workspace         [1][encoder->private_->best_subframe         [1]];
3324                                 break;
3325                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
3326                                 left_subframe  = &encoder->private_->subframe_workspace_mid_side[0][encoder->private_->best_subframe_mid_side[0]];
3327                                 right_subframe = &encoder->private_->subframe_workspace_mid_side[1][encoder->private_->best_subframe_mid_side[1]];
3328                                 break;
3329                         default:
3330                                 FLAC__ASSERT(0);
3331                 }
3332
3333                 switch(channel_assignment) {
3334                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
3335                                 left_bps  = encoder->private_->subframe_bps         [0];
3336                                 right_bps = encoder->private_->subframe_bps         [1];
3337                                 break;
3338                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
3339                                 left_bps  = encoder->private_->subframe_bps         [0];
3340                                 right_bps = encoder->private_->subframe_bps_mid_side[1];
3341                                 break;
3342                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
3343                                 left_bps  = encoder->private_->subframe_bps_mid_side[1];
3344                                 right_bps = encoder->private_->subframe_bps         [1];
3345                                 break;
3346                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
3347                                 left_bps  = encoder->private_->subframe_bps_mid_side[0];
3348                                 right_bps = encoder->private_->subframe_bps_mid_side[1];
3349                                 break;
3350                         default:
3351                                 FLAC__ASSERT(0);
3352                 }
3353
3354                 /* note that encoder_add_subframe_ sets the state for us in case of an error */
3355                 if(!add_subframe_(encoder, frame_header.blocksize, left_bps , left_subframe , encoder->private_->frame))
3356                         return false;
3357                 if(!add_subframe_(encoder, frame_header.blocksize, right_bps, right_subframe, encoder->private_->frame))
3358                         return false;
3359         }
3360         else {
3361                 if(!FLAC__frame_add_header(&frame_header, encoder->private_->frame)) {
3362                         encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
3363                         return false;
3364                 }
3365
3366                 for(channel = 0; channel < encoder->protected_->channels; channel++) {
3367                         if(!add_subframe_(encoder, frame_header.blocksize, encoder->private_->subframe_bps[channel], &encoder->private_->subframe_workspace[channel][encoder->private_->best_subframe[channel]], encoder->private_->frame)) {
3368                                 /* the above function sets the state for us in case of an error */
3369                                 return false;
3370                         }
3371                 }
3372         }
3373
3374         if(encoder->protected_->loose_mid_side_stereo) {
3375                 encoder->private_->loose_mid_side_stereo_frame_count++;
3376                 if(encoder->private_->loose_mid_side_stereo_frame_count >= encoder->private_->loose_mid_side_stereo_frames)
3377                         encoder->private_->loose_mid_side_stereo_frame_count = 0;
3378         }
3379
3380         encoder->private_->last_channel_assignment = frame_header.channel_assignment;
3381
3382         return true;
3383 }
3384
3385 FLAC__bool process_subframe_(
3386         FLAC__StreamEncoder *encoder,
3387         unsigned min_partition_order,
3388         unsigned max_partition_order,
3389         const FLAC__FrameHeader *frame_header,
3390         unsigned subframe_bps,
3391         const FLAC__int32 integer_signal[],
3392 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3393         const FLAC__real real_signal[],
3394 #endif
3395         FLAC__Subframe *subframe[2],
3396         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents[2],
3397         FLAC__int32 *residual[2],
3398         unsigned *best_subframe,
3399         unsigned *best_bits
3400 )
3401 {
3402 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3403         FLAC__float fixed_residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1];
3404 #else
3405         FLAC__fixedpoint fixed_residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1];
3406 #endif
3407 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3408         FLAC__double lpc_residual_bits_per_sample;
3409         FLAC__real autoc[FLAC__MAX_LPC_ORDER+1]; /* WATCHOUT: the size is important even though encoder->protected_->max_lpc_order might be less; some asm routines need all the space */
3410         FLAC__double lpc_error[FLAC__MAX_LPC_ORDER];
3411         unsigned min_lpc_order, max_lpc_order, lpc_order;
3412         unsigned min_qlp_coeff_precision, max_qlp_coeff_precision, qlp_coeff_precision;
3413 #endif
3414         unsigned min_fixed_order, max_fixed_order, guess_fixed_order, fixed_order;
3415         unsigned rice_parameter;
3416         unsigned _candidate_bits, _best_bits;
3417         unsigned _best_subframe;
3418
3419         FLAC__ASSERT(frame_header->blocksize > 0);
3420
3421         /* verbatim subframe is the baseline against which we measure other compressed subframes */
3422         _best_subframe = 0;
3423         if(encoder->private_->disable_verbatim_subframes && frame_header->blocksize >= FLAC__MAX_FIXED_ORDER)
3424                 _best_bits = UINT_MAX;
3425         else
3426                 _best_bits = evaluate_verbatim_subframe_(encoder, integer_signal, frame_header->blocksize, subframe_bps, subframe[_best_subframe]);
3427
3428         if(frame_header->blocksize >= FLAC__MAX_FIXED_ORDER) {
3429                 unsigned signal_is_constant = false;
3430                 guess_fixed_order = encoder->private_->local_fixed_compute_best_predictor(integer_signal+FLAC__MAX_FIXED_ORDER, frame_header->blocksize-FLAC__MAX_FIXED_ORDER, fixed_residual_bits_per_sample);
3431                 /* check for constant subframe */
3432                 if(
3433                         !encoder->private_->disable_constant_subframes &&
3434 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3435                         fixed_residual_bits_per_sample[1] == 0.0
3436 #else
3437                         fixed_residual_bits_per_sample[1] == FLAC__FP_ZERO
3438 #endif
3439                 ) {
3440                         /* the above means it's possible all samples are the same value; now double-check it: */
3441                         unsigned i;
3442                         signal_is_constant = true;
3443                         for(i = 1; i < frame_header->blocksize; i++) {
3444                                 if(integer_signal[0] != integer_signal[i]) {
3445                                         signal_is_constant = false;
3446                                         break;
3447                                 }
3448                         }
3449                 }
3450                 if(signal_is_constant) {
3451                         _candidate_bits = evaluate_constant_subframe_(encoder, integer_signal[0], frame_header->blocksize, subframe_bps, subframe[!_best_subframe]);
3452                         if(_candidate_bits < _best_bits) {
3453                                 _best_subframe = !_best_subframe;
3454                                 _best_bits = _candidate_bits;
3455                         }
3456                 }
3457                 else {
3458                         if(!encoder->private_->disable_fixed_subframes || (encoder->protected_->max_lpc_order == 0 && _best_bits == UINT_MAX)) {
3459                                 /* encode fixed */
3460                                 if(encoder->protected_->do_exhaustive_model_search) {
3461                                         min_fixed_order = 0;
3462                                         max_fixed_order = FLAC__MAX_FIXED_ORDER;
3463                                 }
3464                                 else {
3465                                         min_fixed_order = max_fixed_order = guess_fixed_order;
3466                                 }
3467                                 if(max_fixed_order >= frame_header->blocksize)
3468                                         max_fixed_order = frame_header->blocksize - 1;
3469                                 for(fixed_order = min_fixed_order; fixed_order <= max_fixed_order; fixed_order++) {
3470 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3471                                         if(fixed_residual_bits_per_sample[fixed_order] >= (FLAC__float)subframe_bps)
3472                                                 continue; /* don't even try */
3473                                         rice_parameter = (fixed_residual_bits_per_sample[fixed_order] > 0.0)? (unsigned)(fixed_residual_bits_per_sample[fixed_order]+0.5) : 0; /* 0.5 is for rounding */
3474 #else
3475                                         if(FLAC__fixedpoint_trunc(fixed_residual_bits_per_sample[fixed_order]) >= (int)subframe_bps)
3476                                                 continue; /* don't even try */
3477                                         rice_parameter = (fixed_residual_bits_per_sample[fixed_order] > FLAC__FP_ZERO)? (unsigned)FLAC__fixedpoint_trunc(fixed_residual_bits_per_sample[fixed_order]+FLAC__FP_ONE_HALF) : 0; /* 0.5 is for rounding */
3478 #endif
3479                                         rice_parameter++; /* to account for the signed->unsigned conversion during rice coding */
3480                                         if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
3481 #ifdef DEBUG_VERBOSE
3482                                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @0\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
3483 #endif
3484                                                 rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
3485                                         }
3486                                         _candidate_bits =
3487                                                 evaluate_fixed_subframe_(
3488                                                         encoder,
3489                                                         integer_signal,
3490                                                         residual[!_best_subframe],
3491                                                         encoder->private_->abs_residual_partition_sums,
3492                                                         encoder->private_->raw_bits_per_partition,
3493                                                         frame_header->blocksize,
3494                                                         subframe_bps,
3495                                                         fixed_order,
3496                                                         rice_parameter,
3497                                                         min_partition_order,
3498                                                         max_partition_order,
3499                                                         encoder->protected_->do_escape_coding,
3500                                                         encoder->protected_->rice_parameter_search_dist,
3501                                                         subframe[!_best_subframe],
3502                                                         partitioned_rice_contents[!_best_subframe]
3503                                                 );
3504                                         if(_candidate_bits < _best_bits) {
3505                                                 _best_subframe = !_best_subframe;
3506                                                 _best_bits = _candidate_bits;
3507                                         }
3508                                 }
3509                         }
3510
3511 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3512                         /* encode lpc */
3513                         if(encoder->protected_->max_lpc_order > 0) {
3514                                 if(encoder->protected_->max_lpc_order >= frame_header->blocksize)
3515                                         max_lpc_order = frame_header->blocksize-1;
3516                                 else
3517                                         max_lpc_order = encoder->protected_->max_lpc_order;
3518                                 if(max_lpc_order > 0) {
3519                                         unsigned a;
3520                                         for (a = 0; a < encoder->protected_->num_apodizations; a++) {
3521                                                 FLAC__lpc_window_data(real_signal, encoder->private_->window[a], encoder->private_->windowed_signal, frame_header->blocksize);
3522                                                 encoder->private_->local_lpc_compute_autocorrelation(encoder->private_->windowed_signal, frame_header->blocksize, max_lpc_order+1, autoc);
3523                                                 /* if autoc[0] == 0.0, the signal is constant and we usually won't get here, but it can happen */
3524                                                 if(autoc[0] != 0.0) {
3525                                                         FLAC__lpc_compute_lp_coefficients(autoc, &max_lpc_order, encoder->private_->lp_coeff, lpc_error);
3526                                                         if(encoder->protected_->do_exhaustive_model_search) {
3527                                                                 min_lpc_order = 1;
3528                                                         }
3529                                                         else {
3530                                                                 const unsigned guess_lpc_order =
3531                                                                         FLAC__lpc_compute_best_order(
3532                                                                                 lpc_error,
3533                                                                                 max_lpc_order,
3534                                                                                 frame_header->blocksize,
3535                                                                                 subframe_bps + (
3536                                                                                         encoder->protected_->do_qlp_coeff_prec_search?
3537                                                                                                 FLAC__MIN_QLP_COEFF_PRECISION : /* have to guess; use the min possible size to avoid accidentally favoring lower orders */
3538                                                                                                 encoder->protected_->qlp_coeff_precision
3539                                                                                 )
3540                                                                         );
3541                                                                 min_lpc_order = max_lpc_order = guess_lpc_order;
3542                                                         }
3543                                                         if(max_lpc_order >= frame_header->blocksize)
3544                                                                 max_lpc_order = frame_header->blocksize - 1;
3545                                                         for(lpc_order = min_lpc_order; lpc_order <= max_lpc_order; lpc_order++) {
3546                                                                 lpc_residual_bits_per_sample = FLAC__lpc_compute_expected_bits_per_residual_sample(lpc_error[lpc_order-1], frame_header->blocksize-lpc_order);
3547                                                                 if(lpc_residual_bits_per_sample >= (FLAC__double)subframe_bps)
3548                                                                         continue; /* don't even try */
3549                                                                 rice_parameter = (lpc_residual_bits_per_sample > 0.0)? (unsigned)(lpc_residual_bits_per_sample+0.5) : 0; /* 0.5 is for rounding */
3550                                                                 rice_parameter++; /* to account for the signed->unsigned conversion during rice coding */
3551                                                                 if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
3552 #ifdef DEBUG_VERBOSE
3553                                                                         fprintf(stderr, "clipping rice_parameter (%u -> %u) @1\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
3554 #endif
3555                                                                         rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
3556                                                                 }
3557                                                                 if(encoder->protected_->do_qlp_coeff_prec_search) {
3558                                                                         min_qlp_coeff_precision = FLAC__MIN_QLP_COEFF_PRECISION;
3559                                                                         /* try to ensure a 32-bit datapath throughout for 16bps(+1bps for side channel) or less */
3560                                                                         if(subframe_bps <= 17) {
3561                                                                                 max_qlp_coeff_precision = min(32 - subframe_bps - lpc_order, FLAC__MAX_QLP_COEFF_PRECISION);
3562                                                                                 max_qlp_coeff_precision = max(max_qlp_coeff_precision, min_qlp_coeff_precision);
3563                                                                         }
3564                                                                         else
3565                                                                                 max_qlp_coeff_precision = FLAC__MAX_QLP_COEFF_PRECISION;
3566                                                                 }
3567                                                                 else {
3568                                                                         min_qlp_coeff_precision = max_qlp_coeff_precision = encoder->protected_->qlp_coeff_precision;
3569                                                                 }
3570                                                                 for(qlp_coeff_precision = min_qlp_coeff_precision; qlp_coeff_precision <= max_qlp_coeff_precision; qlp_coeff_precision++) {
3571                                                                         _candidate_bits =
3572                                                                                 evaluate_lpc_subframe_(
3573                                                                                         encoder,
3574                                                                                         integer_signal,
3575                                                                                         residual[!_best_subframe],
3576                                                                                         encoder->private_->abs_residual_partition_sums,
3577                                                                                         encoder->private_->raw_bits_per_partition,
3578                                                                                         encoder->private_->lp_coeff[lpc_order-1],
3579                                                                                         frame_header->blocksize,
3580                                                                                         subframe_bps,
3581                                                                                         lpc_order,
3582                                                                                         qlp_coeff_precision,
3583                                                                                         rice_parameter,
3584                                                                                         min_partition_order,
3585                                                                                         max_partition_order,
3586                                                                                         encoder->protected_->do_escape_coding,
3587                                                                                         encoder->protected_->rice_parameter_search_dist,
3588                                                                                         subframe[!_best_subframe],
3589                                                                                         partitioned_rice_contents[!_best_subframe]
3590                                                                                 );
3591                                                                         if(_candidate_bits > 0) { /* if == 0, there was a problem quantizing the lpcoeffs */
3592                                                                                 if(_candidate_bits < _best_bits) {
3593                                                                                         _best_subframe = !_best_subframe;
3594                                                                                         _best_bits = _candidate_bits;
3595                                                                                 }
3596                                                                         }
3597                                                                 }
3598                                                         }
3599                                                 }
3600                                         }
3601                                 }
3602                         }
3603 #endif /* !defined FLAC__INTEGER_ONLY_LIBRARY */
3604                 }
3605         }
3606
3607         /* under rare circumstances this can happen when all but lpc subframe types are disabled: */
3608         if(_best_bits == UINT_MAX) {
3609                 FLAC__ASSERT(_best_subframe == 0);
3610                 _best_bits = evaluate_verbatim_subframe_(encoder, integer_signal, frame_header->blocksize, subframe_bps, subframe[_best_subframe]);
3611         }
3612
3613         *best_subframe = _best_subframe;
3614         *best_bits = _best_bits;
3615
3616         return true;
3617 }
3618
3619 FLAC__bool add_subframe_(
3620         FLAC__StreamEncoder *encoder,
3621         unsigned blocksize,
3622         unsigned subframe_bps,
3623         const FLAC__Subframe *subframe,
3624         FLAC__BitWriter *frame
3625 )
3626 {
3627         switch(subframe->type) {
3628                 case FLAC__SUBFRAME_TYPE_CONSTANT:
3629                         if(!FLAC__subframe_add_constant(&(subframe->data.constant), subframe_bps, subframe->wasted_bits, frame)) {
3630                                 encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
3631                                 return false;
3632                         }
3633                         break;
3634                 case FLAC__SUBFRAME_TYPE_FIXED:
3635                         if(!FLAC__subframe_add_fixed(&(subframe->data.fixed), blocksize - subframe->data.fixed.order, subframe_bps, subframe->wasted_bits, frame)) {
3636                                 encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
3637                                 return false;
3638                         }
3639                         break;
3640                 case FLAC__SUBFRAME_TYPE_LPC:
3641                         if(!FLAC__subframe_add_lpc(&(subframe->data.lpc), blocksize - subframe->data.lpc.order, subframe_bps, subframe->wasted_bits, frame)) {
3642                                 encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
3643                                 return false;
3644                         }
3645                         break;
3646                 case FLAC__SUBFRAME_TYPE_VERBATIM:
3647                         if(!FLAC__subframe_add_verbatim(&(subframe->data.verbatim), blocksize, subframe_bps, subframe->wasted_bits, frame)) {
3648                                 encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
3649                                 return false;
3650                         }
3651                         break;
3652                 default:
3653                         FLAC__ASSERT(0);
3654         }
3655
3656         return true;
3657 }
3658
3659 #define SPOTCHECK_ESTIMATE 0
3660 #if SPOTCHECK_ESTIMATE
3661 static void spotcheck_subframe_estimate_(
3662         FLAC__StreamEncoder *encoder,
3663         unsigned blocksize,
3664         unsigned subframe_bps,
3665         const FLAC__Subframe *subframe,
3666         unsigned estimate
3667 )
3668 {
3669         FLAC__bool ret;
3670         FLAC__BitWriter *frame = FLAC__bitwriter_new();
3671         if(frame == 0) {
3672                 fprintf(stderr, "EST: can't allocate frame\n");
3673                 return;
3674         }
3675         if(!FLAC__bitwriter_init(frame)) {
3676                 fprintf(stderr, "EST: can't init frame\n");
3677                 return;
3678         }
3679         ret = add_subframe_(encoder, blocksize, subframe_bps, subframe, frame);
3680         FLAC__ASSERT(ret);
3681         {
3682                 const unsigned actual = FLAC__bitwriter_get_input_bits_unconsumed(frame);
3683                 if(estimate != actual)
3684                         fprintf(stderr, "EST: bad, frame#%u sub#%%d type=%8s est=%u, actual=%u, delta=%d\n", encoder->private_->current_frame_number, FLAC__SubframeTypeString[subframe->type], estimate, actual, (int)actual-(int)estimate);
3685         }
3686         FLAC__bitwriter_delete(frame);
3687 }
3688 #endif
3689
3690 unsigned evaluate_constant_subframe_(
3691         FLAC__StreamEncoder *encoder,
3692         const FLAC__int32 signal,
3693         unsigned blocksize,
3694         unsigned subframe_bps,
3695         FLAC__Subframe *subframe
3696 )
3697 {
3698         unsigned estimate;
3699         subframe->type = FLAC__SUBFRAME_TYPE_CONSTANT;
3700         subframe->data.constant.value = signal;
3701
3702         estimate = FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + subframe->wasted_bits + subframe_bps;
3703
3704 #if SPOTCHECK_ESTIMATE
3705         spotcheck_subframe_estimate_(encoder, blocksize, subframe_bps, subframe, estimate);
3706 #else
3707         (void)encoder, (void)blocksize;
3708 #endif
3709
3710         return estimate;
3711 }
3712
3713 unsigned evaluate_fixed_subframe_(
3714         FLAC__StreamEncoder *encoder,
3715         const FLAC__int32 signal[],
3716         FLAC__int32 residual[],
3717         FLAC__uint64 abs_residual_partition_sums[],
3718         unsigned raw_bits_per_partition[],
3719         unsigned blocksize,
3720         unsigned subframe_bps,
3721         unsigned order,
3722         unsigned rice_parameter,
3723         unsigned min_partition_order,
3724         unsigned max_partition_order,
3725         FLAC__bool do_escape_coding,
3726         unsigned rice_parameter_search_dist,
3727         FLAC__Subframe *subframe,
3728         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents
3729 )
3730 {
3731         unsigned i, residual_bits, estimate;
3732         const unsigned residual_samples = blocksize - order;
3733
3734         FLAC__fixed_compute_residual(signal+order, residual_samples, order, residual);
3735
3736         subframe->type = FLAC__SUBFRAME_TYPE_FIXED;
3737
3738         subframe->data.fixed.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE;
3739         subframe->data.fixed.entropy_coding_method.data.partitioned_rice.contents = partitioned_rice_contents;
3740         subframe->data.fixed.residual = residual;
3741
3742         residual_bits =
3743                 find_best_partition_order_(
3744                         encoder->private_,
3745                         residual,
3746                         abs_residual_partition_sums,
3747                         raw_bits_per_partition,
3748                         residual_samples,
3749                         order,
3750                         rice_parameter,
3751                         min_partition_order,
3752                         max_partition_order,
3753                         do_escape_coding,
3754                         rice_parameter_search_dist,
3755                         &subframe->data.fixed.entropy_coding_method.data.partitioned_rice
3756                 );
3757
3758         subframe->data.fixed.order = order;
3759         for(i = 0; i < order; i++)
3760                 subframe->data.fixed.warmup[i] = signal[i];
3761
3762         estimate = FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + subframe->wasted_bits + (order * subframe_bps) + residual_bits;
3763
3764 #if SPOTCHECK_ESTIMATE
3765         spotcheck_subframe_estimate_(encoder, blocksize, subframe_bps, subframe, estimate);
3766 #endif
3767
3768         return estimate;
3769 }
3770
3771 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3772 unsigned evaluate_lpc_subframe_(
3773         FLAC__StreamEncoder *encoder,
3774         const FLAC__int32 signal[],
3775         FLAC__int32 residual[],
3776         FLAC__uint64 abs_residual_partition_sums[],
3777         unsigned raw_bits_per_partition[],
3778         const FLAC__real lp_coeff[],
3779         unsigned blocksize,
3780         unsigned subframe_bps,
3781         unsigned order,
3782         unsigned qlp_coeff_precision,
3783         unsigned rice_parameter,
3784         unsigned min_partition_order,
3785         unsigned max_partition_order,
3786         FLAC__bool do_escape_coding,
3787         unsigned rice_parameter_search_dist,
3788         FLAC__Subframe *subframe,
3789         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents
3790 )
3791 {
3792         FLAC__int32 qlp_coeff[FLAC__MAX_LPC_ORDER];
3793         unsigned i, residual_bits, estimate;
3794         int quantization, ret;
3795         const unsigned residual_samples = blocksize - order;
3796
3797         /* try to keep qlp coeff precision such that only 32-bit math is required for decode of <=16bps streams */
3798         if(subframe_bps <= 16) {
3799                 FLAC__ASSERT(order > 0);
3800                 FLAC__ASSERT(order <= FLAC__MAX_LPC_ORDER);
3801                 qlp_coeff_precision = min(qlp_coeff_precision, 32 - subframe_bps - FLAC__bitmath_ilog2(order));
3802         }
3803
3804         ret = FLAC__lpc_quantize_coefficients(lp_coeff, order, qlp_coeff_precision, qlp_coeff, &quantization);
3805         if(ret != 0)
3806                 return 0; /* this is a hack to indicate to the caller that we can't do lp at this order on this subframe */
3807
3808         if(subframe_bps + qlp_coeff_precision + FLAC__bitmath_ilog2(order) <= 32)
3809                 if(subframe_bps <= 16 && qlp_coeff_precision <= 16)
3810                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit(signal+order, residual_samples, qlp_coeff, order, quantization, residual);
3811                 else
3812                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients(signal+order, residual_samples, qlp_coeff, order, quantization, residual);
3813         else
3814                 encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_64bit(signal+order, residual_samples, qlp_coeff, order, quantization, residual);
3815
3816         subframe->type = FLAC__SUBFRAME_TYPE_LPC;
3817
3818         subframe->data.lpc.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE;
3819         subframe->data.lpc.entropy_coding_method.data.partitioned_rice.contents = partitioned_rice_contents;
3820         subframe->data.lpc.residual = residual;
3821
3822         residual_bits =
3823                 find_best_partition_order_(
3824                         encoder->private_,
3825                         residual,
3826                         abs_residual_partition_sums,
3827                         raw_bits_per_partition,
3828                         residual_samples,
3829                         order,
3830                         rice_parameter,
3831                         min_partition_order,
3832                         max_partition_order,
3833                         do_escape_coding,
3834                         rice_parameter_search_dist,
3835                         &subframe->data.lpc.entropy_coding_method.data.partitioned_rice
3836                 );
3837
3838         subframe->data.lpc.order = order;
3839         subframe->data.lpc.qlp_coeff_precision = qlp_coeff_precision;
3840         subframe->data.lpc.quantization_level = quantization;
3841         memcpy(subframe->data.lpc.qlp_coeff, qlp_coeff, sizeof(FLAC__int32)*FLAC__MAX_LPC_ORDER);
3842         for(i = 0; i < order; i++)
3843                 subframe->data.lpc.warmup[i] = signal[i];
3844
3845         estimate = FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + subframe->wasted_bits + FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN + FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN + (order * (qlp_coeff_precision + subframe_bps)) + residual_bits;
3846
3847 #if SPOTCHECK_ESTIMATE
3848         spotcheck_subframe_estimate_(encoder, blocksize, subframe_bps, subframe, estimate);
3849 #endif
3850
3851         return estimate;
3852 }
3853 #endif
3854
3855 unsigned evaluate_verbatim_subframe_(
3856         FLAC__StreamEncoder *encoder,
3857         const FLAC__int32 signal[],
3858         unsigned blocksize,
3859         unsigned subframe_bps,
3860         FLAC__Subframe *subframe
3861 )
3862 {
3863         unsigned estimate;
3864
3865         subframe->type = FLAC__SUBFRAME_TYPE_VERBATIM;
3866
3867         subframe->data.verbatim.data = signal;
3868
3869         estimate = FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + subframe->wasted_bits + (blocksize * subframe_bps);
3870
3871 #if SPOTCHECK_ESTIMATE
3872         spotcheck_subframe_estimate_(encoder, blocksize, subframe_bps, subframe, estimate);
3873 #else
3874         (void)encoder;
3875 #endif
3876
3877         return estimate;
3878 }
3879
3880 unsigned find_best_partition_order_(
3881         FLAC__StreamEncoderPrivate *private_,
3882         const FLAC__int32 residual[],
3883         FLAC__uint64 abs_residual_partition_sums[],
3884         unsigned raw_bits_per_partition[],
3885         unsigned residual_samples,
3886         unsigned predictor_order,
3887         unsigned rice_parameter,
3888         unsigned min_partition_order,
3889         unsigned max_partition_order,
3890         FLAC__bool do_escape_coding,
3891         unsigned rice_parameter_search_dist,
3892         FLAC__EntropyCodingMethod_PartitionedRice *best_partitioned_rice
3893 )
3894 {
3895         unsigned residual_bits, best_residual_bits = 0;
3896         unsigned best_parameters_index = 0;
3897         const unsigned blocksize = residual_samples + predictor_order;
3898
3899         max_partition_order = FLAC__format_get_max_rice_partition_order_from_blocksize_limited_max_and_predictor_order(max_partition_order, blocksize, predictor_order);
3900         min_partition_order = min(min_partition_order, max_partition_order);
3901
3902         precompute_partition_info_sums_(residual, abs_residual_partition_sums, residual_samples, predictor_order, min_partition_order, max_partition_order);
3903
3904         if(do_escape_coding)
3905                 precompute_partition_info_escapes_(residual, raw_bits_per_partition, residual_samples, predictor_order, min_partition_order, max_partition_order);
3906
3907         {
3908                 int partition_order;
3909                 unsigned sum;
3910
3911                 for(partition_order = (int)max_partition_order, sum = 0; partition_order >= (int)min_partition_order; partition_order--) {
3912                         if(!
3913                                 set_partitioned_rice_(
3914 #ifdef EXACT_RICE_BITS_CALCULATION
3915                                         residual,
3916 #endif
3917                                         abs_residual_partition_sums+sum,
3918                                         raw_bits_per_partition+sum,
3919                                         residual_samples,
3920                                         predictor_order,
3921                                         rice_parameter,
3922                                         rice_parameter_search_dist,
3923                                         (unsigned)partition_order,
3924                                         do_escape_coding,
3925                                         &private_->partitioned_rice_contents_extra[!best_parameters_index],
3926                                         &residual_bits
3927                                 )
3928                         )
3929                         {
3930                                 FLAC__ASSERT(best_residual_bits != 0);
3931                                 break;
3932                         }
3933                         sum += 1u << partition_order;
3934                         if(best_residual_bits == 0 || residual_bits < best_residual_bits) {
3935                                 best_residual_bits = residual_bits;
3936                                 best_parameters_index = !best_parameters_index;
3937                                 best_partitioned_rice->order = partition_order;
3938                         }
3939                 }
3940         }
3941
3942         /*
3943          * We are allowed to de-const the pointer based on our special knowledge;
3944          * it is const to the outside world.
3945          */
3946         {
3947                 FLAC__EntropyCodingMethod_PartitionedRiceContents* best_partitioned_rice_contents = (FLAC__EntropyCodingMethod_PartitionedRiceContents*)best_partitioned_rice->contents;
3948                 FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(best_partitioned_rice_contents, max(6, best_partitioned_rice->order));
3949                 memcpy(best_partitioned_rice_contents->parameters, private_->partitioned_rice_contents_extra[best_parameters_index].parameters, sizeof(unsigned)*(1<<(best_partitioned_rice->order)));
3950                 memcpy(best_partitioned_rice_contents->raw_bits, private_->partitioned_rice_contents_extra[best_parameters_index].raw_bits, sizeof(unsigned)*(1<<(best_partitioned_rice->order)));
3951         }
3952
3953         return best_residual_bits;
3954 }
3955
3956 void precompute_partition_info_sums_(
3957         const FLAC__int32 residual[],
3958         FLAC__uint64 abs_residual_partition_sums[],
3959         unsigned residual_samples,
3960         unsigned predictor_order,
3961         unsigned min_partition_order,
3962         unsigned max_partition_order
3963 )
3964 {
3965         int partition_order;
3966         unsigned from_partition, to_partition = 0;
3967         const unsigned blocksize = residual_samples + predictor_order;
3968
3969         /* first do max_partition_order */
3970         for(partition_order = (int)max_partition_order; partition_order >= 0; partition_order--) {
3971                 FLAC__uint64 abs_residual_partition_sum; /* OPT: can reasonably be FLAC__uint32 for bps <= 17 and maybe higher */
3972                 unsigned partition, partition_sample, partition_samples, residual_sample;
3973                 const unsigned partitions = 1u << partition_order;
3974                 const unsigned default_partition_samples = blocksize >> partition_order;
3975
3976                 FLAC__ASSERT(default_partition_samples > predictor_order);
3977
3978                 for(partition = residual_sample = 0; partition < partitions; partition++) {
3979                         partition_samples = default_partition_samples;
3980                         if(partition == 0)
3981                                 partition_samples -= predictor_order;
3982                         abs_residual_partition_sum = 0;
3983                         for(partition_sample = 0; partition_sample < partition_samples; partition_sample++, residual_sample++) {
3984 #if defined _MSC_VER
3985                                 /* OPT: abs() may be faster for some compilers */
3986                                 abs_residual_partition_sum += abs(residual[residual_sample]); /* abs(INT_MIN) is undefined, but if the residual is INT_MIN we have bigger problems */
3987 #else
3988                                 const FLAC__int32 r = residual[residual_sample];
3989                                 if(r < 0)
3990                                         abs_residual_partition_sum -= r;
3991                                 else
3992                                         abs_residual_partition_sum += r;
3993 #endif
3994                         }
3995                         abs_residual_partition_sums[partition] = abs_residual_partition_sum;
3996                 }
3997                 to_partition = partitions;
3998                 break;
3999         }
4000
4001         /* now merge partitions for lower orders */
4002         for(from_partition = 0, --partition_order; partition_order >= (int)min_partition_order; partition_order--) {
4003                 FLAC__uint64 s;
4004                 unsigned i;
4005                 const unsigned partitions = 1u << partition_order;
4006                 for(i = 0; i < partitions; i++) {
4007                         s = abs_residual_partition_sums[from_partition];
4008                         from_partition++;
4009                         abs_residual_partition_sums[to_partition] = s + abs_residual_partition_sums[from_partition];
4010                         from_partition++;
4011                         to_partition++;
4012                 }
4013         }
4014 }
4015
4016 void precompute_partition_info_escapes_(
4017         const FLAC__int32 residual[],
4018         unsigned raw_bits_per_partition[],
4019         unsigned residual_samples,
4020         unsigned predictor_order,
4021         unsigned min_partition_order,
4022         unsigned max_partition_order
4023 )
4024 {
4025         int partition_order;
4026         unsigned from_partition, to_partition = 0;
4027         const unsigned blocksize = residual_samples + predictor_order;
4028
4029         /* first do max_partition_order */
4030         for(partition_order = (int)max_partition_order; partition_order >= 0; partition_order--) {
4031                 FLAC__int32 r;
4032                 FLAC__uint32 rmax;
4033                 unsigned partition, partition_sample, partition_samples, residual_sample;
4034                 const unsigned partitions = 1u << partition_order;
4035                 const unsigned default_partition_samples = blocksize >> partition_order;
4036
4037                 FLAC__ASSERT(default_partition_samples > predictor_order);
4038
4039                 for(partition = residual_sample = 0; partition < partitions; partition++) {
4040                         partition_samples = default_partition_samples;
4041                         if(partition == 0)
4042                                 partition_samples -= predictor_order;
4043                         rmax = 0;
4044                         for(partition_sample = 0; partition_sample < partition_samples; partition_sample++) {
4045                                 r = residual[residual_sample++];
4046                                 /* OPT: maybe faster: rmax |= r ^ (r>>31) */
4047                                 if(r < 0)
4048                                         rmax |= ~r;
4049                                 else
4050                                         rmax |= r;
4051                         }
4052                         /* now we know all residual values are in the range [-rmax-1,rmax] */
4053                         raw_bits_per_partition[partition] = rmax? FLAC__bitmath_ilog2(rmax) + 2 : 1;
4054                 }
4055                 to_partition = partitions;
4056                 break; /*@@@ yuck, should remove the 'for' loop instead */
4057         }
4058
4059         /* now merge partitions for lower orders */
4060         for(from_partition = 0, --partition_order; partition_order >= (int)min_partition_order; partition_order--) {
4061                 unsigned m;
4062                 unsigned i;
4063                 const unsigned partitions = 1u << partition_order;
4064                 for(i = 0; i < partitions; i++) {
4065                         m = raw_bits_per_partition[from_partition];
4066                         from_partition++;
4067                         raw_bits_per_partition[to_partition] = max(m, raw_bits_per_partition[from_partition]);
4068                         from_partition++;
4069                         to_partition++;
4070                 }
4071         }
4072 }
4073
4074 #ifdef EXACT_RICE_BITS_CALCULATION
4075 static FLaC__INLINE unsigned count_rice_bits_in_partition_(
4076         const unsigned rice_parameter,
4077         const unsigned partition_samples,
4078         const FLAC__int32 *residual
4079 )
4080 {
4081         unsigned i, partition_bits =
4082                 FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN +
4083                 (1+rice_parameter) * partition_samples /* 1 for unary stop bit + rice_parameter for the binary portion */
4084         ;
4085         for(i = 0; i < partition_samples; i++)
4086                 partition_bits += ( (FLAC__uint32)((residual[i]<<1)^(residual[i]>>31)) >> rice_parameter );
4087         return partition_bits;
4088 }
4089 #else
4090 static FLaC__INLINE unsigned count_rice_bits_in_partition_(
4091         const unsigned rice_parameter,
4092         const unsigned partition_samples,
4093         const FLAC__uint64 abs_residual_partition_sum
4094 )
4095 {
4096         return
4097                 FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN +
4098                 (1+rice_parameter) * partition_samples + /* 1 for unary stop bit + rice_parameter for the binary portion */
4099                 (
4100                         rice_parameter?
4101                                 (unsigned)(abs_residual_partition_sum >> (rice_parameter-1)) /* rice_parameter-1 because the real coder sign-folds instead of using a sign bit */
4102                                 : (unsigned)(abs_residual_partition_sum << 1) /* can't shift by negative number, so reverse */
4103                 )
4104                 - (partition_samples >> 1)
4105                 /* -(partition_samples>>1) to subtract out extra contributions to the abs_residual_partition_sum.
4106                  * The actual number of bits used is closer to the sum(for all i in the partition) of  abs(residual[i])>>(rice_parameter-1)
4107                  * By using the abs_residual_partition sum, we also add in bits in the LSBs that would normally be shifted out.
4108                  * So the subtraction term tries to guess how many extra bits were contributed.
4109                  * If the LSBs are randomly distributed, this should average to 0.5 extra bits per sample.
4110                  */
4111         ;
4112 }
4113 #endif
4114
4115 FLAC__bool set_partitioned_rice_(
4116 #ifdef EXACT_RICE_BITS_CALCULATION
4117         const FLAC__int32 residual[],
4118 #endif
4119         const FLAC__uint64 abs_residual_partition_sums[],
4120         const unsigned raw_bits_per_partition[],
4121         const unsigned residual_samples,
4122         const unsigned predictor_order,
4123         const unsigned suggested_rice_parameter,
4124         const unsigned rice_parameter_search_dist,
4125         const unsigned partition_order,
4126         const FLAC__bool search_for_escapes,
4127         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents,
4128         unsigned *bits
4129 )
4130 {
4131         unsigned rice_parameter, partition_bits;
4132         unsigned best_partition_bits, best_rice_parameter = 0;
4133         unsigned bits_ = FLAC__ENTROPY_CODING_METHOD_TYPE_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN;
4134         unsigned *parameters, *raw_bits;
4135 #ifdef ENABLE_RICE_PARAMETER_SEARCH
4136         unsigned min_rice_parameter, max_rice_parameter;
4137 #else
4138         (void)rice_parameter_search_dist;
4139 #endif
4140
4141         FLAC__ASSERT(suggested_rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER);
4142
4143         FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(partitioned_rice_contents, max(6, partition_order));
4144         parameters = partitioned_rice_contents->parameters;
4145         raw_bits = partitioned_rice_contents->raw_bits;
4146
4147         if(partition_order == 0) {
4148                 best_partition_bits = 0xffffffff;
4149 #ifdef ENABLE_RICE_PARAMETER_SEARCH
4150                 if(rice_parameter_search_dist) {
4151                         if(suggested_rice_parameter < rice_parameter_search_dist)
4152                                 min_rice_parameter = 0;
4153                         else
4154                                 min_rice_parameter = suggested_rice_parameter - rice_parameter_search_dist;
4155                         max_rice_parameter = suggested_rice_parameter + rice_parameter_search_dist;
4156                         if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
4157 #ifdef DEBUG_VERBOSE
4158                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @5\n", max_rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
4159 #endif
4160                                 max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
4161                         }
4162                 }
4163                 else
4164                         min_rice_parameter = max_rice_parameter = suggested_rice_parameter;
4165
4166                 for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
4167 #else
4168                         rice_parameter = suggested_rice_parameter;
4169 #endif
4170 #ifdef EXACT_RICE_BITS_CALCULATION
4171                         partition_bits = count_rice_bits_in_partition_(rice_parameter, residual_samples, residual);
4172 #else
4173                         partition_bits = count_rice_bits_in_partition_(rice_parameter, residual_samples, abs_residual_partition_sums[0]);
4174 #endif
4175                         if(partition_bits < best_partition_bits) {
4176                                 best_rice_parameter = rice_parameter;
4177                                 best_partition_bits = partition_bits;
4178                         }
4179 #ifdef ENABLE_RICE_PARAMETER_SEARCH
4180                 }
4181 #endif
4182                 if(search_for_escapes) {
4183                         partition_bits = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN + raw_bits_per_partition[0] * residual_samples;
4184                         if(partition_bits <= best_partition_bits) {
4185                                 raw_bits[0] = raw_bits_per_partition[0];
4186                                 best_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
4187                                 best_partition_bits = partition_bits;
4188                         }
4189                 }
4190                 parameters[0] = best_rice_parameter;
4191                 bits_ += best_partition_bits;
4192         }
4193         else {
4194                 unsigned partition, residual_sample;
4195                 unsigned partition_samples;
4196                 FLAC__uint64 mean, k;
4197                 const unsigned partitions = 1u << partition_order;
4198                 for(partition = residual_sample = 0; partition < partitions; partition++) {
4199                         partition_samples = (residual_samples+predictor_order) >> partition_order;
4200                         if(partition == 0) {
4201                                 if(partition_samples <= predictor_order)
4202                                         return false;
4203                                 else
4204                                         partition_samples -= predictor_order;
4205                         }
4206                         mean = abs_residual_partition_sums[partition];
4207                         /* we are basically calculating the size in bits of the
4208                          * average residual magnitude in the partition:
4209                          *   rice_parameter = floor(log2(mean/partition_samples))
4210                          * 'mean' is not a good name for the variable, it is
4211                          * actually the sum of magnitudes of all residual values
4212                          * in the partition, so the actual mean is
4213                          * mean/partition_samples
4214                          */
4215                         for(rice_parameter = 0, k = partition_samples; k < mean; rice_parameter++, k <<= 1)
4216                                 ;
4217                         if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
4218 #ifdef DEBUG_VERBOSE
4219                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @6\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
4220 #endif
4221                                 rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
4222                         }
4223
4224                         best_partition_bits = 0xffffffff;
4225 #ifdef ENABLE_RICE_PARAMETER_SEARCH
4226                         if(rice_parameter_search_dist) {
4227                                 if(rice_parameter < rice_parameter_search_dist)
4228                                         min_rice_parameter = 0;
4229                                 else
4230                                         min_rice_parameter = rice_parameter - rice_parameter_search_dist;
4231                                 max_rice_parameter = rice_parameter + rice_parameter_search_dist;
4232                                 if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
4233 #ifdef DEBUG_VERBOSE
4234                                         fprintf(stderr, "clipping rice_parameter (%u -> %u) @7\n", max_rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
4235 #endif
4236                                         max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
4237                                 }
4238                         }
4239                         else
4240                                 min_rice_parameter = max_rice_parameter = rice_parameter;
4241
4242                         for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
4243 #endif
4244 #ifdef EXACT_RICE_BITS_CALCULATION
4245                                 partition_bits = count_rice_bits_in_partition_(rice_parameter, partition_samples, residual+residual_sample);
4246 #else
4247                                 partition_bits = count_rice_bits_in_partition_(rice_parameter, partition_samples, abs_residual_partition_sums[partition]);
4248 #endif
4249                                 if(partition_bits < best_partition_bits) {
4250                                         best_rice_parameter = rice_parameter;
4251                                         best_partition_bits = partition_bits;
4252                                 }
4253 #ifdef ENABLE_RICE_PARAMETER_SEARCH
4254                         }
4255 #endif
4256                         if(search_for_escapes) {
4257                                 partition_bits = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN + raw_bits_per_partition[partition] * partition_samples;
4258                                 if(partition_bits <= best_partition_bits) {
4259                                         raw_bits[partition] = raw_bits_per_partition[partition];
4260                                         best_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
4261                                         best_partition_bits = partition_bits;
4262                                 }
4263                         }
4264                         parameters[partition] = best_rice_parameter;
4265                         bits_ += best_partition_bits;
4266                         residual_sample += partition_samples;
4267                 }
4268         }
4269
4270         *bits = bits_;
4271         return true;
4272 }
4273
4274 unsigned get_wasted_bits_(FLAC__int32 signal[], unsigned samples)
4275 {
4276         unsigned i, shift;
4277         FLAC__int32 x = 0;
4278
4279         for(i = 0; i < samples && !(x&1); i++)
4280                 x |= signal[i];
4281
4282         if(x == 0) {
4283                 shift = 0;
4284         }
4285         else {
4286                 for(shift = 0; !(x&1); shift++)
4287                         x >>= 1;
4288         }
4289
4290         if(shift > 0) {
4291                 for(i = 0; i < samples; i++)
4292                          signal[i] >>= shift;
4293         }
4294
4295         return shift;
4296 }
4297
4298 void append_to_verify_fifo_(verify_input_fifo *fifo, const FLAC__int32 * const input[], unsigned input_offset, unsigned channels, unsigned wide_samples)
4299 {
4300         unsigned channel;
4301
4302         for(channel = 0; channel < channels; channel++)
4303                 memcpy(&fifo->data[channel][fifo->tail], &input[channel][input_offset], sizeof(FLAC__int32) * wide_samples);
4304
4305         fifo->tail += wide_samples;
4306
4307         FLAC__ASSERT(fifo->tail <= fifo->size);
4308 }
4309
4310 void append_to_verify_fifo_interleaved_(verify_input_fifo *fifo, const FLAC__int32 input[], unsigned input_offset, unsigned channels, unsigned wide_samples)
4311 {
4312         unsigned channel;
4313         unsigned sample, wide_sample;
4314         unsigned tail = fifo->tail;
4315
4316         sample = input_offset * channels;
4317         for(wide_sample = 0; wide_sample < wide_samples; wide_sample++) {
4318                 for(channel = 0; channel < channels; channel++)
4319                         fifo->data[channel][tail] = input[sample++];
4320                 tail++;
4321         }
4322         fifo->tail = tail;
4323
4324         FLAC__ASSERT(fifo->tail <= fifo->size);
4325 }
4326
4327 FLAC__StreamDecoderReadStatus verify_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
4328 {
4329         FLAC__StreamEncoder *encoder = (FLAC__StreamEncoder*)client_data;
4330         const size_t encoded_bytes = encoder->private_->verify.output.bytes;
4331         (void)decoder;
4332
4333         if(encoder->private_->verify.needs_magic_hack) {
4334                 FLAC__ASSERT(*bytes >= FLAC__STREAM_SYNC_LENGTH);
4335                 *bytes = FLAC__STREAM_SYNC_LENGTH;
4336                 memcpy(buffer, FLAC__STREAM_SYNC_STRING, *bytes);
4337                 encoder->private_->verify.needs_magic_hack = false;
4338         }
4339         else {
4340                 if(encoded_bytes == 0) {
4341                         /*
4342                          * If we get here, a FIFO underflow has occurred,
4343                          * which means there is a bug somewhere.
4344                          */
4345                         FLAC__ASSERT(0);
4346                         return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
4347                 }
4348                 else if(encoded_bytes < *bytes)
4349                         *bytes = encoded_bytes;
4350                 memcpy(buffer, encoder->private_->verify.output.data, *bytes);
4351                 encoder->private_->verify.output.data += *bytes;
4352                 encoder->private_->verify.output.bytes -= *bytes;
4353         }
4354
4355         return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
4356 }
4357
4358 FLAC__StreamDecoderWriteStatus verify_write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
4359 {
4360         FLAC__StreamEncoder *encoder = (FLAC__StreamEncoder *)client_data;
4361         unsigned channel;
4362         const unsigned channels = frame->header.channels;
4363         const unsigned blocksize = frame->header.blocksize;
4364         const unsigned bytes_per_block = sizeof(FLAC__int32) * blocksize;
4365
4366         (void)decoder;
4367
4368         for(channel = 0; channel < channels; channel++) {
4369                 if(0 != memcmp(buffer[channel], encoder->private_->verify.input_fifo.data[channel], bytes_per_block)) {
4370                         unsigned i, sample = 0;
4371                         FLAC__int32 expect = 0, got = 0;
4372
4373                         for(i = 0; i < blocksize; i++) {
4374                                 if(buffer[channel][i] != encoder->private_->verify.input_fifo.data[channel][i]) {
4375                                         sample = i;
4376                                         expect = (FLAC__int32)encoder->private_->verify.input_fifo.data[channel][i];
4377                                         got = (FLAC__int32)buffer[channel][i];
4378                                         break;
4379                                 }
4380                         }
4381                         FLAC__ASSERT(i < blocksize);
4382                         FLAC__ASSERT(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
4383                         encoder->private_->verify.error_stats.absolute_sample = frame->header.number.sample_number + sample;
4384                         encoder->private_->verify.error_stats.frame_number = (unsigned)(frame->header.number.sample_number / blocksize);
4385                         encoder->private_->verify.error_stats.channel = channel;
4386                         encoder->private_->verify.error_stats.sample = sample;
4387                         encoder->private_->verify.error_stats.expected = expect;
4388                         encoder->private_->verify.error_stats.got = got;
4389                         encoder->protected_->state = FLAC__STREAM_ENCODER_VERIFY_MISMATCH_IN_AUDIO_DATA;
4390                         return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
4391                 }
4392         }
4393         /* dequeue the frame from the fifo */
4394         encoder->private_->verify.input_fifo.tail -= blocksize;
4395         FLAC__ASSERT(encoder->private_->verify.input_fifo.tail <= OVERREAD_);
4396         for(channel = 0; channel < channels; channel++)
4397                 memmove(&encoder->private_->verify.input_fifo.data[channel][0], &encoder->private_->verify.input_fifo.data[channel][blocksize], encoder->private_->verify.input_fifo.tail * sizeof(encoder->private_->verify.input_fifo.data[0][0]));
4398         return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
4399 }
4400
4401 void verify_metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
4402 {
4403         (void)decoder, (void)metadata, (void)client_data;
4404 }
4405
4406 void verify_error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
4407 {
4408         FLAC__StreamEncoder *encoder = (FLAC__StreamEncoder*)client_data;
4409         (void)decoder, (void)status;
4410         encoder->protected_->state = FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR;
4411 }
4412
4413 FLAC__StreamEncoderReadStatus file_read_callback_(const FLAC__StreamEncoder *encoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
4414 {
4415         (void)client_data;
4416
4417         *bytes = fread(buffer, 1, *bytes, encoder->private_->file);
4418         if (*bytes == 0) {
4419                 if (feof(encoder->private_->file))
4420                         return FLAC__STREAM_ENCODER_READ_STATUS_END_OF_STREAM;
4421                 else if (ferror(encoder->private_->file))
4422                         return FLAC__STREAM_ENCODER_READ_STATUS_ABORT;
4423         }
4424         return FLAC__STREAM_ENCODER_READ_STATUS_CONTINUE;
4425 }
4426
4427 FLAC__StreamEncoderSeekStatus file_seek_callback_(const FLAC__StreamEncoder *encoder, FLAC__uint64 absolute_byte_offset, void *client_data)
4428 {
4429         (void)client_data;
4430
4431         if(fseeko(encoder->private_->file, (off_t)absolute_byte_offset, SEEK_SET) < 0)
4432                 return FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR;
4433         else
4434                 return FLAC__STREAM_ENCODER_SEEK_STATUS_OK;
4435 }
4436
4437 FLAC__StreamEncoderTellStatus file_tell_callback_(const FLAC__StreamEncoder *encoder, FLAC__uint64 *absolute_byte_offset, void *client_data)
4438 {
4439         off_t offset;
4440
4441         (void)client_data;
4442
4443         offset = ftello(encoder->private_->file);
4444
4445         if(offset < 0) {
4446                 return FLAC__STREAM_ENCODER_TELL_STATUS_ERROR;
4447         }
4448         else {
4449                 *absolute_byte_offset = (FLAC__uint64)offset;
4450                 return FLAC__STREAM_ENCODER_TELL_STATUS_OK;
4451         }
4452 }
4453
4454 #ifdef FLAC__VALGRIND_TESTING
4455 static size_t local__fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)
4456 {
4457         size_t ret = fwrite(ptr, size, nmemb, stream);
4458         if(!ferror(stream))
4459                 fflush(stream);
4460         return ret;
4461 }
4462 #else
4463 #define local__fwrite fwrite
4464 #endif
4465
4466 FLAC__StreamEncoderWriteStatus file_write_callback_(const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], size_t bytes, unsigned samples, unsigned current_frame, void *client_data)
4467 {
4468         (void)client_data, (void)current_frame;
4469
4470         if(local__fwrite(buffer, sizeof(FLAC__byte), bytes, encoder->private_->file) == bytes) {
4471                 FLAC__bool call_it = 0 != encoder->private_->progress_callback && (
4472 #if FLAC__HAS_OGG
4473                         /* We would like to be able to use 'samples > 0' in the
4474                          * clause here but currently because of the nature of our
4475                          * Ogg writing implementation, 'samples' is always 0 (see
4476                          * ogg_encoder_aspect.c).  The downside is extra progress
4477                          * callbacks.
4478                          */
4479                         encoder->private_->is_ogg? true :
4480 #endif
4481                         samples > 0
4482                 );
4483                 if(call_it) {
4484                         /* NOTE: We have to add +bytes, +samples, and +1 to the stats
4485                          * because at this point in the callback chain, the stats
4486                          * have not been updated.  Only after we return and control
4487                          * gets back to write_frame_() are the stats updated
4488                          */
4489                         encoder->private_->progress_callback(encoder, encoder->private_->bytes_written+bytes, encoder->private_->samples_written+samples, encoder->private_->frames_written+(samples?1:0), encoder->private_->total_frames_estimate, encoder->private_->client_data);
4490                 }
4491                 return FLAC__STREAM_ENCODER_WRITE_STATUS_OK;
4492         }
4493         else
4494                 return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;
4495 }
4496
4497 /*
4498  * This will forcibly set stdout to binary mode (for OSes that require it)
4499  */
4500 FILE *get_binary_stdout_(void)
4501 {
4502         /* if something breaks here it is probably due to the presence or
4503          * absence of an underscore before the identifiers 'setmode',
4504          * 'fileno', and/or 'O_BINARY'; check your system header files.
4505          */
4506 #if defined _MSC_VER || defined __MINGW32__
4507         _setmode(_fileno(stdout), _O_BINARY);
4508 #elif defined __CYGWIN__
4509         /* almost certainly not needed for any modern Cygwin, but let's be safe... */
4510         setmode(_fileno(stdout), _O_BINARY);
4511 #elif defined __EMX__
4512         setmode(fileno(stdout), O_BINARY);
4513 #endif
4514
4515         return stdout;
4516 }