src/libFLAC/stream_encoder.c

   1 /* libFLAC - Free Lossless Audio Codec library
   2  * Copyright (C) 2000,2001,2002,2003,2004,2005,2006  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 <= 1200 || 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 #ifdef min
  75 #undef min
  76 #endif
  77 #define min(x,y) ((x)<(y)?(x):(y))
  78
  79 #ifdef max
  80 #undef max
  81 #endif
  82 #define max(x,y) ((x)>(y)?(x):(y))
  83
  84 /* Exact Rice codeword length calculation is off by default.  The simple
  85  * (and fast) estimation (of how many bits a residual value will be
  86  * encoded with) in this encoder is very good, almost always yielding
  87  * compression within 0.1% of exact calculation.
  88  */
  89 #undef EXACT_RICE_BITS_CALCULATION
  90 /* Rice parameter searching is off by default.  The simple (and fast)
  91  * parameter estimation in this encoder is very good, almost always
  92  * yielding compression within 0.1% of the optimal parameters.
  93  */
  94 #undef ENABLE_RICE_PARAMETER_SEARCH
  95
  96 typedef struct {
  97         FLAC__int32 *data[FLAC__MAX_CHANNELS];
  98         unsigned size; /* of each data[] in samples */
  99         unsigned tail;
 100 } verify_input_fifo;
 101
 102 typedef struct {
 103         const FLAC__byte *data;
 104         unsigned capacity;
 105         unsigned bytes;
 106 } verify_output;
 107
 108 typedef enum {
 109         ENCODER_IN_MAGIC = 0,
 110         ENCODER_IN_METADATA = 1,
 111         ENCODER_IN_AUDIO = 2
 112 } EncoderStateHint;
 113
 114 static struct CompressionLevels {
 115         FLAC__bool do_mid_side_stereo;
 116         FLAC__bool loose_mid_side_stereo;
 117         unsigned max_lpc_order;
 118         unsigned qlp_coeff_precision;
 119         FLAC__bool do_qlp_coeff_prec_search;
 120         FLAC__bool do_escape_coding;
 121         FLAC__bool do_exhaustive_model_search;
 122         unsigned min_residual_partition_order;
 123         unsigned max_residual_partition_order;
 124         unsigned rice_parameter_search_dist;
 125 } compression_levels_[] = {
 126         { false, false,  0, 0, false, false, false, 2, 2, 0 },
 127         { true , true ,  0, 0, false, false, false, 2, 2, 0 },
 128         { true , false,  0, 0, false, false, false, 0, 3, 0 },
 129         { false, false,  6, 0, false, false, false, 3, 3, 0 },
 130         { true , true ,  8, 0, false, false, false, 3, 3, 0 },
 131         { true , false,  8, 0, false, false, false, 3, 3, 0 },
 132         { true , false,  8, 0, false, false, false, 0, 4, 0 },
 133         { true , false,  8, 0, false, false, true , 0, 6, 0 },
 134         { true , false, 12, 0, false, false, true , 0, 6, 0 }
 135 };
 136
 137
 138 /***********************************************************************
 139  *
 140  * Private class method prototypes
 141  *
 142  ***********************************************************************/
 143
 144 static void set_defaults_(FLAC__StreamEncoder *encoder);
 145 static void free_(FLAC__StreamEncoder *encoder);
 146 static FLAC__bool resize_buffers_(FLAC__StreamEncoder *encoder, unsigned new_blocksize);
 147 static FLAC__bool write_bitbuffer_(FLAC__StreamEncoder *encoder, unsigned samples, FLAC__bool is_last_block);
 148 static FLAC__StreamEncoderWriteStatus write_frame_(FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], size_t bytes, unsigned samples, FLAC__bool is_last_block);
 149 static void update_metadata_(const FLAC__StreamEncoder *encoder);
 150 #if FLAC__HAS_OGG
 151 static void update_ogg_metadata_(FLAC__StreamEncoder *encoder);
 152 #endif
 153 static FLAC__bool process_frame_(FLAC__StreamEncoder *encoder, FLAC__bool is_fractional_block, FLAC__bool is_last_block);
 154 static FLAC__bool process_subframes_(FLAC__StreamEncoder *encoder, FLAC__bool is_fractional_block);
 155
 156 static FLAC__bool process_subframe_(
 157         FLAC__StreamEncoder *encoder,
 158         unsigned min_partition_order,
 159         unsigned max_partition_order,
 160         const FLAC__FrameHeader *frame_header,
 161         unsigned subframe_bps,
 162         const FLAC__int32 integer_signal[],
 163 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 164         const FLAC__real real_signal[],
 165 #endif
 166         FLAC__Subframe *subframe[2],
 167         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents[2],
 168         FLAC__int32 *residual[2],
 169         unsigned *best_subframe,
 170         unsigned *best_bits
 171 );
 172
 173 static FLAC__bool add_subframe_(
 174         FLAC__StreamEncoder *encoder,
 175         unsigned blocksize,
 176         unsigned subframe_bps,
 177         const FLAC__Subframe *subframe,
 178         FLAC__BitWriter *frame
 179 );
 180
 181 static unsigned evaluate_constant_subframe_(
 182         FLAC__StreamEncoder *encoder,
 183         const FLAC__int32 signal,
 184         unsigned blocksize,
 185         unsigned subframe_bps,
 186         FLAC__Subframe *subframe
 187 );
 188
 189 static unsigned evaluate_fixed_subframe_(
 190         FLAC__StreamEncoder *encoder,
 191         const FLAC__int32 signal[],
 192         FLAC__int32 residual[],
 193         FLAC__uint64 abs_residual_partition_sums[],
 194         unsigned raw_bits_per_partition[],
 195         unsigned blocksize,
 196         unsigned subframe_bps,
 197         unsigned order,
 198         unsigned rice_parameter,
 199         unsigned min_partition_order,
 200         unsigned max_partition_order,
 201         FLAC__bool do_escape_coding,
 202         unsigned rice_parameter_search_dist,
 203         FLAC__Subframe *subframe,
 204         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents
 205 );
 206
 207 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 208 static unsigned evaluate_lpc_subframe_(
 209         FLAC__StreamEncoder *encoder,
 210         const FLAC__int32 signal[],
 211         FLAC__int32 residual[],
 212         FLAC__uint64 abs_residual_partition_sums[],
 213         unsigned raw_bits_per_partition[],
 214         const FLAC__real lp_coeff[],
 215         unsigned blocksize,
 216         unsigned subframe_bps,
 217         unsigned order,
 218         unsigned qlp_coeff_precision,
 219         unsigned rice_parameter,
 220         unsigned min_partition_order,
 221         unsigned max_partition_order,
 222         FLAC__bool do_escape_coding,
 223         unsigned rice_parameter_search_dist,
 224         FLAC__Subframe *subframe,
 225         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents
 226 );
 227 #endif
 228
 229 static unsigned evaluate_verbatim_subframe_(
 230         FLAC__StreamEncoder *encoder,
 231         const FLAC__int32 signal[],
 232         unsigned blocksize,
 233         unsigned subframe_bps,
 234         FLAC__Subframe *subframe
 235 );
 236
 237 static unsigned find_best_partition_order_(
 238         struct FLAC__StreamEncoderPrivate *private_,
 239         const FLAC__int32 residual[],
 240         FLAC__uint64 abs_residual_partition_sums[],
 241         unsigned raw_bits_per_partition[],
 242         unsigned residual_samples,
 243         unsigned predictor_order,
 244         unsigned rice_parameter,
 245         unsigned min_partition_order,
 246         unsigned max_partition_order,
 247         FLAC__bool do_escape_coding,
 248         unsigned rice_parameter_search_dist,
 249         FLAC__EntropyCodingMethod_PartitionedRice *best_partitioned_rice
 250 );
 251
 252 static void precompute_partition_info_sums_(
 253         const FLAC__int32 residual[],
 254         FLAC__uint64 abs_residual_partition_sums[],
 255         unsigned residual_samples,
 256         unsigned predictor_order,
 257         unsigned min_partition_order,
 258         unsigned max_partition_order
 259 );
 260
 261 static void precompute_partition_info_escapes_(
 262         const FLAC__int32 residual[],
 263         unsigned raw_bits_per_partition[],
 264         unsigned residual_samples,
 265         unsigned predictor_order,
 266         unsigned min_partition_order,
 267         unsigned max_partition_order
 268 );
 269
 270 static FLAC__bool set_partitioned_rice_(
 271 #ifdef EXACT_RICE_BITS_CALCULATION
 272         const FLAC__int32 residual[],
 273 #endif
 274         const FLAC__uint64 abs_residual_partition_sums[],
 275         const unsigned raw_bits_per_partition[],
 276         const unsigned residual_samples,
 277         const unsigned predictor_order,
 278         const unsigned suggested_rice_parameter,
 279         const unsigned rice_parameter_search_dist,
 280         const unsigned partition_order,
 281         const FLAC__bool search_for_escapes,
 282         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents,
 283         unsigned *bits
 284 );
 285
 286 static unsigned get_wasted_bits_(FLAC__int32 signal[], unsigned samples);
 287
 288 /* verify-related routines: */
 289 static void append_to_verify_fifo_(
 290         verify_input_fifo *fifo,
 291         const FLAC__int32 * const input[],
 292         unsigned input_offset,
 293         unsigned channels,
 294         unsigned wide_samples
 295 );
 296
 297 static void append_to_verify_fifo_interleaved_(
 298         verify_input_fifo *fifo,
 299         const FLAC__int32 input[],
 300         unsigned input_offset,
 301         unsigned channels,
 302         unsigned wide_samples
 303 );
 304
 305 static FLAC__StreamDecoderReadStatus verify_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
 306 static FLAC__StreamDecoderWriteStatus verify_write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
 307 static void verify_metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
 308 static void verify_error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
 309
 310 static FLAC__StreamEncoderReadStatus file_read_callback_(const FLAC__StreamEncoder *encoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
 311 static FLAC__StreamEncoderSeekStatus file_seek_callback_(const FLAC__StreamEncoder *encoder, FLAC__uint64 absolute_byte_offset, void *client_data);
 312 static FLAC__StreamEncoderTellStatus file_tell_callback_(const FLAC__StreamEncoder *encoder, FLAC__uint64 *absolute_byte_offset, void *client_data);
 313 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);
 314 static FILE *get_binary_stdout_();
 315
 316
 317 /***********************************************************************
 318  *
 319  * Private class data
 320  *
 321  ***********************************************************************/
 322
 323 typedef struct FLAC__StreamEncoderPrivate {
 324         unsigned input_capacity;                          /* current size (in samples) of the signal and residual buffers */
 325         FLAC__int32 *integer_signal[FLAC__MAX_CHANNELS];  /* the integer version of the input signal */
 326         FLAC__int32 *integer_signal_mid_side[2];          /* the integer version of the mid-side input signal (stereo only) */
 327 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 328         FLAC__real *real_signal[FLAC__MAX_CHANNELS];      /* the floating-point version of the input signal */
 329         FLAC__real *real_signal_mid_side[2];              /* the floating-point version of the mid-side input signal (stereo only) */
 330         FLAC__real *window[FLAC__MAX_APODIZATION_FUNCTIONS]; /* the pre-computed floating-point window for each apodization function */
 331         FLAC__real *windowed_signal;                      /* the real_signal[] * current window[] */
 332 #endif
 333         unsigned subframe_bps[FLAC__MAX_CHANNELS];        /* the effective bits per sample of the input signal (stream bps - wasted bits) */
 334         unsigned subframe_bps_mid_side[2];                /* the effective bits per sample of the mid-side input signal (stream bps - wasted bits + 0/1) */
 335         FLAC__int32 *residual_workspace[FLAC__MAX_CHANNELS][2]; /* each channel has a candidate and best workspace where the subframe residual signals will be stored */
 336         FLAC__int32 *residual_workspace_mid_side[2][2];
 337         FLAC__Subframe subframe_workspace[FLAC__MAX_CHANNELS][2];
 338         FLAC__Subframe subframe_workspace_mid_side[2][2];
 339         FLAC__Subframe *subframe_workspace_ptr[FLAC__MAX_CHANNELS][2];
 340         FLAC__Subframe *subframe_workspace_ptr_mid_side[2][2];
 341         FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents_workspace[FLAC__MAX_CHANNELS][2];
 342         FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents_workspace_mid_side[FLAC__MAX_CHANNELS][2];
 343         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents_workspace_ptr[FLAC__MAX_CHANNELS][2];
 344         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents_workspace_ptr_mid_side[FLAC__MAX_CHANNELS][2];
 345         unsigned best_subframe[FLAC__MAX_CHANNELS];       /* index (0 or 1) into 2nd dimension of the above workspaces */
 346         unsigned best_subframe_mid_side[2];
 347         unsigned best_subframe_bits[FLAC__MAX_CHANNELS];  /* size in bits of the best subframe for each channel */
 348         unsigned best_subframe_bits_mid_side[2];
 349         FLAC__uint64 *abs_residual_partition_sums;        /* workspace where the sum of abs(candidate residual) for each partition is stored */
 350         unsigned *raw_bits_per_partition;                 /* workspace where the sum of silog2(candidate residual) for each partition is stored */
 351         FLAC__BitWriter *frame;                           /* the current frame being worked on */
 352         unsigned loose_mid_side_stereo_frames;            /* rounded number of frames the encoder will use before trying both independent and mid/side frames again */
 353         unsigned loose_mid_side_stereo_frame_count;       /* number of frames using the current channel assignment */
 354         FLAC__ChannelAssignment last_channel_assignment;
 355         FLAC__StreamMetadata streaminfo;                  /* scratchpad for STREAMINFO as it is built */
 356         FLAC__StreamMetadata_SeekTable *seek_table;       /* pointer into encoder->protected_->metadata_ where the seek table is */
 357         unsigned current_sample_number;
 358         unsigned current_frame_number;
 359         struct FLAC__MD5Context md5context;
 360         FLAC__CPUInfo cpuinfo;
 361 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 362         unsigned (*local_fixed_compute_best_predictor)(const FLAC__int32 data[], unsigned data_len, FLAC__float residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]);
 363 #else
 364         unsigned (*local_fixed_compute_best_predictor)(const FLAC__int32 data[], unsigned data_len, FLAC__fixedpoint residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]);
 365 #endif
 366 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 367         void (*local_lpc_compute_autocorrelation)(const FLAC__real data[], unsigned data_len, unsigned lag, FLAC__real autoc[]);
 368         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[]);
 369         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[]);
 370         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[]);
 371 #endif
 372         FLAC__bool use_wide_by_block;          /* use slow 64-bit versions of some functions because of the block size */
 373         FLAC__bool use_wide_by_partition;      /* use slow 64-bit versions of some functions because of the min partition order and blocksize */
 374         FLAC__bool use_wide_by_order;          /* use slow 64-bit versions of some functions because of the lpc order */
 375         FLAC__bool disable_constant_subframes;
 376         FLAC__bool disable_fixed_subframes;
 377         FLAC__bool disable_verbatim_subframes;
 378 #if FLAC__HAS_OGG
 379         FLAC__bool is_ogg;
 380 #endif
 381         FLAC__StreamEncoderReadCallback read_callback; /* currently only needed for Ogg FLAC */
 382         FLAC__StreamEncoderSeekCallback seek_callback;
 383         FLAC__StreamEncoderTellCallback tell_callback;
 384         FLAC__StreamEncoderWriteCallback write_callback;
 385         FLAC__StreamEncoderMetadataCallback metadata_callback;
 386         FLAC__StreamEncoderProgressCallback progress_callback;
 387         void *client_data;
 388         unsigned first_seekpoint_to_check;
 389         FILE *file;                            /* only used when encoding to a file */
 390         FLAC__uint64 bytes_written;
 391         FLAC__uint64 samples_written;
 392         unsigned frames_written;
 393         unsigned total_frames_estimate;
 394         /* unaligned (original) pointers to allocated data */
 395         FLAC__int32 *integer_signal_unaligned[FLAC__MAX_CHANNELS];
 396         FLAC__int32 *integer_signal_mid_side_unaligned[2];
 397 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 398         FLAC__real *real_signal_unaligned[FLAC__MAX_CHANNELS];
 399         FLAC__real *real_signal_mid_side_unaligned[2];
 400         FLAC__real *window_unaligned[FLAC__MAX_APODIZATION_FUNCTIONS];
 401         FLAC__real *windowed_signal_unaligned;
 402 #endif
 403         FLAC__int32 *residual_workspace_unaligned[FLAC__MAX_CHANNELS][2];
 404         FLAC__int32 *residual_workspace_mid_side_unaligned[2][2];
 405         FLAC__uint64 *abs_residual_partition_sums_unaligned;
 406         unsigned *raw_bits_per_partition_unaligned;
 407         /*
 408          * These fields have been moved here from private function local
 409          * declarations merely to save stack space during encoding.
 410          */
 411 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 412         FLAC__real lp_coeff[FLAC__MAX_LPC_ORDER][FLAC__MAX_LPC_ORDER]; /* from process_subframe_() */
 413 #endif
 414         FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents_extra[2]; /* from find_best_partition_order_() */
 415         /*
 416          * The data for the verify section
 417          */
 418         struct {
 419                 FLAC__StreamDecoder *decoder;
 420                 EncoderStateHint state_hint;
 421                 FLAC__bool needs_magic_hack;
 422                 verify_input_fifo input_fifo;
 423                 verify_output output;
 424                 struct {
 425                         FLAC__uint64 absolute_sample;
 426                         unsigned frame_number;
 427                         unsigned channel;
 428                         unsigned sample;
 429                         FLAC__int32 expected;
 430                         FLAC__int32 got;
 431                 } error_stats;
 432         } verify;
 433         FLAC__bool is_being_deleted; /* if true, call to ..._finish() from ..._delete() will not call the callbacks */
 434 } FLAC__StreamEncoderPrivate;
 435
 436 /***********************************************************************
 437  *
 438  * Public static class data
 439  *
 440  ***********************************************************************/
 441
 442 FLAC_API const char * const FLAC__StreamEncoderStateString[] = {
 443         "FLAC__STREAM_ENCODER_OK",
 444         "FLAC__STREAM_ENCODER_UNINITIALIZED",
 445         "FLAC__STREAM_ENCODER_OGG_ERROR",
 446         "FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR",
 447         "FLAC__STREAM_ENCODER_VERIFY_MISMATCH_IN_AUDIO_DATA",
 448         "FLAC__STREAM_ENCODER_CLIENT_ERROR",
 449         "FLAC__STREAM_ENCODER_IO_ERROR",
 450         "FLAC__STREAM_ENCODER_FRAMING_ERROR",
 451         "FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR"
 452 };
 453
 454 FLAC_API const char * const FLAC__StreamEncoderInitStatusString[] = {
 455         "FLAC__STREAM_ENCODER_INIT_STATUS_OK",
 456         "FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR",
 457         "FLAC__STREAM_ENCODER_INIT_STATUS_UNSUPPORTED_CONTAINER",
 458         "FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_CALLBACKS",
 459         "FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_NUMBER_OF_CHANNELS",
 460         "FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_BITS_PER_SAMPLE",
 461         "FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_SAMPLE_RATE",
 462         "FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_BLOCK_SIZE",
 463         "FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_MAX_LPC_ORDER",
 464         "FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_QLP_COEFF_PRECISION",
 465         "FLAC__STREAM_ENCODER_INIT_STATUS_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER",
 466         "FLAC__STREAM_ENCODER_INIT_STATUS_NOT_STREAMABLE",
 467         "FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA",
 468         "FLAC__STREAM_ENCODER_INIT_STATUS_ALREADY_INITIALIZED"
 469 };
 470
 471 FLAC_API const char * const FLAC__treamEncoderReadStatusString[] = {
 472         "FLAC__STREAM_ENCODER_READ_STATUS_CONTINUE",
 473         "FLAC__STREAM_ENCODER_READ_STATUS_END_OF_STREAM",
 474         "FLAC__STREAM_ENCODER_READ_STATUS_ABORT",
 475         "FLAC__STREAM_ENCODER_READ_STATUS_UNSUPPORTED"
 476 };
 477
 478 FLAC_API const char * const FLAC__StreamEncoderWriteStatusString[] = {
 479         "FLAC__STREAM_ENCODER_WRITE_STATUS_OK",
 480         "FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR"
 481 };
 482
 483 FLAC_API const char * const FLAC__StreamEncoderSeekStatusString[] = {
 484         "FLAC__STREAM_ENCODER_SEEK_STATUS_OK",
 485         "FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR",
 486         "FLAC__STREAM_ENCODER_SEEK_STATUS_UNSUPPORTED"
 487 };
 488
 489 FLAC_API const char * const FLAC__StreamEncoderTellStatusString[] = {
 490         "FLAC__STREAM_ENCODER_TELL_STATUS_OK",
 491         "FLAC__STREAM_ENCODER_TELL_STATUS_ERROR",
 492         "FLAC__STREAM_ENCODER_TELL_STATUS_UNSUPPORTED"
 493 };
 494
 495 /* Number of samples that will be overread to watch for end of stream.  By
 496  * 'overread', we mean that the FLAC__stream_encoder_process*() calls will
 497  * always try to read blocksize+1 samples before encoding a block, so that
 498  * even if the stream has a total sample count that is an integral multiple
 499  * of the blocksize, we will still notice when we are encoding the last
 500  * block.  This is needed, for example, to correctly set the end-of-stream
 501  * marker in Ogg FLAC.
 502  *
 503  * WATCHOUT: some parts of the code assert that OVERREAD_ == 1 and there's
 504  * not really any reason to change it.
 505  */
 506 static const unsigned OVERREAD_ = 1;
 507
 508 /***********************************************************************
 509  *
 510  * Class constructor/destructor
 511  *
 512  */
 513 FLAC_API FLAC__StreamEncoder *FLAC__stream_encoder_new()
 514 {
 515         FLAC__StreamEncoder *encoder;
 516         unsigned i;
 517
 518         FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
 519
 520         encoder = (FLAC__StreamEncoder*)calloc(1, sizeof(FLAC__StreamEncoder));
 521         if(encoder == 0) {
 522                 return 0;
 523         }
 524
 525         encoder->protected_ = (FLAC__StreamEncoderProtected*)calloc(1, sizeof(FLAC__StreamEncoderProtected));
 526         if(encoder->protected_ == 0) {
 527                 free(encoder);
 528                 return 0;
 529         }
 530
 531         encoder->private_ = (FLAC__StreamEncoderPrivate*)calloc(1, sizeof(FLAC__StreamEncoderPrivate));
 532         if(encoder->private_ == 0) {
 533                 free(encoder->protected_);
 534                 free(encoder);
 535                 return 0;
 536         }
 537
 538         encoder->private_->frame = FLAC__bitwriter_new();
 539         if(encoder->private_->frame == 0) {
 540                 free(encoder->private_);
 541                 free(encoder->protected_);
 542                 free(encoder);
 543                 return 0;
 544         }
 545
 546         encoder->private_->file = 0;
 547
 548         set_defaults_(encoder);
 549
 550         encoder->private_->is_being_deleted = false;
 551
 552         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 553                 encoder->private_->subframe_workspace_ptr[i][0] = &encoder->private_->subframe_workspace[i][0];
 554                 encoder->private_->subframe_workspace_ptr[i][1] = &encoder->private_->subframe_workspace[i][1];
 555         }
 556         for(i = 0; i < 2; i++) {
 557                 encoder->private_->subframe_workspace_ptr_mid_side[i][0] = &encoder->private_->subframe_workspace_mid_side[i][0];
 558                 encoder->private_->subframe_workspace_ptr_mid_side[i][1] = &encoder->private_->subframe_workspace_mid_side[i][1];
 559         }
 560         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 561                 encoder->private_->partitioned_rice_contents_workspace_ptr[i][0] = &encoder->private_->partitioned_rice_contents_workspace[i][0];
 562                 encoder->private_->partitioned_rice_contents_workspace_ptr[i][1] = &encoder->private_->partitioned_rice_contents_workspace[i][1];
 563         }
 564         for(i = 0; i < 2; i++) {
 565                 encoder->private_->partitioned_rice_contents_workspace_ptr_mid_side[i][0] = &encoder->private_->partitioned_rice_contents_workspace_mid_side[i][0];
 566                 encoder->private_->partitioned_rice_contents_workspace_ptr_mid_side[i][1] = &encoder->private_->partitioned_rice_contents_workspace_mid_side[i][1];
 567         }
 568
 569         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 570                 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&encoder->private_->partitioned_rice_contents_workspace[i][0]);
 571                 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&encoder->private_->partitioned_rice_contents_workspace[i][1]);
 572         }
 573         for(i = 0; i < 2; i++) {
 574                 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&encoder->private_->partitioned_rice_contents_workspace_mid_side[i][0]);
 575                 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&encoder->private_->partitioned_rice_contents_workspace_mid_side[i][1]);
 576         }
 577         for(i = 0; i < 2; i++)
 578                 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&encoder->private_->partitioned_rice_contents_extra[i]);
 579
 580         encoder->protected_->state = FLAC__STREAM_ENCODER_UNINITIALIZED;
 581
 582         return encoder;
 583 }
 584
 585 FLAC_API void FLAC__stream_encoder_delete(FLAC__StreamEncoder *encoder)
 586 {
 587         unsigned i;
 588
 589         FLAC__ASSERT(0 != encoder);
 590         FLAC__ASSERT(0 != encoder->protected_);
 591         FLAC__ASSERT(0 != encoder->private_);
 592         FLAC__ASSERT(0 != encoder->private_->frame);
 593
 594         encoder->private_->is_being_deleted = true;
 595
 596         (void)FLAC__stream_encoder_finish(encoder);
 597
 598         if(0 != encoder->private_->verify.decoder)
 599                 FLAC__stream_decoder_delete(encoder->private_->verify.decoder);
 600
 601         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 602                 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&encoder->private_->partitioned_rice_contents_workspace[i][0]);
 603                 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&encoder->private_->partitioned_rice_contents_workspace[i][1]);
 604         }
 605         for(i = 0; i < 2; i++) {
 606                 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&encoder->private_->partitioned_rice_contents_workspace_mid_side[i][0]);
 607                 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&encoder->private_->partitioned_rice_contents_workspace_mid_side[i][1]);
 608         }
 609         for(i = 0; i < 2; i++)
 610                 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&encoder->private_->partitioned_rice_contents_extra[i]);
 611
 612         FLAC__bitwriter_delete(encoder->private_->frame);
 613         free(encoder->private_);
 614         free(encoder->protected_);
 615         free(encoder);
 616 }
 617
 618 /***********************************************************************
 619  *
 620  * Public class methods
 621  *
 622  ***********************************************************************/
 623
 624 static FLAC__StreamEncoderInitStatus init_stream_internal_(
 625         FLAC__StreamEncoder *encoder,
 626         FLAC__StreamEncoderReadCallback read_callback,
 627         FLAC__StreamEncoderWriteCallback write_callback,
 628         FLAC__StreamEncoderSeekCallback seek_callback,
 629         FLAC__StreamEncoderTellCallback tell_callback,
 630         FLAC__StreamEncoderMetadataCallback metadata_callback,
 631         void *client_data,
 632         FLAC__bool is_ogg
 633 )
 634 {
 635         unsigned i;
 636         FLAC__bool metadata_has_seektable, metadata_has_vorbis_comment, metadata_picture_has_type1, metadata_picture_has_type2;
 637
 638         FLAC__ASSERT(0 != encoder);
 639
 640         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 641                 return FLAC__STREAM_ENCODER_INIT_STATUS_ALREADY_INITIALIZED;
 642
 643 #if !FLAC__HAS_OGG
 644         if(is_ogg)
 645                 return FLAC__STREAM_ENCODER_INIT_STATUS_UNSUPPORTED_CONTAINER;
 646 #endif
 647
 648         if(0 == write_callback || (seek_callback && 0 == tell_callback))
 649                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_CALLBACKS;
 650
 651         if(encoder->protected_->channels == 0 || encoder->protected_->channels > FLAC__MAX_CHANNELS)
 652                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_NUMBER_OF_CHANNELS;
 653
 654         if(encoder->protected_->channels != 2) {
 655                 encoder->protected_->do_mid_side_stereo = false;
 656                 encoder->protected_->loose_mid_side_stereo = false;
 657         }
 658         else if(!encoder->protected_->do_mid_side_stereo)
 659                 encoder->protected_->loose_mid_side_stereo = false;
 660
 661         if(encoder->protected_->bits_per_sample >= 32)
 662                 encoder->protected_->do_mid_side_stereo = false; /* since we currenty do 32-bit math, the side channel would have 33 bps and overflow */
 663
 664         if(encoder->protected_->bits_per_sample < FLAC__MIN_BITS_PER_SAMPLE || encoder->protected_->bits_per_sample > FLAC__REFERENCE_CODEC_MAX_BITS_PER_SAMPLE)
 665                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_BITS_PER_SAMPLE;
 666
 667         if(!FLAC__format_sample_rate_is_valid(encoder->protected_->sample_rate))
 668                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_SAMPLE_RATE;
 669
 670         if(encoder->protected_->blocksize == 0) {
 671                 if(encoder->protected_->max_lpc_order == 0)
 672                         encoder->protected_->blocksize = 1152;
 673                 else
 674                         encoder->protected_->blocksize = 4608;
 675         }
 676
 677         if(encoder->protected_->blocksize < FLAC__MIN_BLOCK_SIZE || encoder->protected_->blocksize > FLAC__MAX_BLOCK_SIZE)
 678                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_BLOCK_SIZE;
 679
 680         if(encoder->protected_->max_lpc_order > FLAC__MAX_LPC_ORDER)
 681                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_MAX_LPC_ORDER;
 682
 683         if(encoder->protected_->blocksize < encoder->protected_->max_lpc_order)
 684                 return FLAC__STREAM_ENCODER_INIT_STATUS_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER;
 685
 686         if(encoder->protected_->qlp_coeff_precision == 0) {
 687                 if(encoder->protected_->bits_per_sample < 16) {
 688                         /* @@@ need some data about how to set this here w.r.t. blocksize and sample rate */
 689                         /* @@@ until then we'll make a guess */
 690                         encoder->protected_->qlp_coeff_precision = max(FLAC__MIN_QLP_COEFF_PRECISION, 2 + encoder->protected_->bits_per_sample / 2);
 691                 }
 692                 else if(encoder->protected_->bits_per_sample == 16) {
 693                         if(encoder->protected_->blocksize <= 192)
 694                                 encoder->protected_->qlp_coeff_precision = 7;
 695                         else if(encoder->protected_->blocksize <= 384)
 696                                 encoder->protected_->qlp_coeff_precision = 8;
 697                         else if(encoder->protected_->blocksize <= 576)
 698                                 encoder->protected_->qlp_coeff_precision = 9;
 699                         else if(encoder->protected_->blocksize <= 1152)
 700                                 encoder->protected_->qlp_coeff_precision = 10;
 701                         else if(encoder->protected_->blocksize <= 2304)
 702                                 encoder->protected_->qlp_coeff_precision = 11;
 703                         else if(encoder->protected_->blocksize <= 4608)
 704                                 encoder->protected_->qlp_coeff_precision = 12;
 705                         else
 706                                 encoder->protected_->qlp_coeff_precision = 13;
 707                 }
 708                 else {
 709                         if(encoder->protected_->blocksize <= 384)
 710                                 encoder->protected_->qlp_coeff_precision = FLAC__MAX_QLP_COEFF_PRECISION-2;
 711                         else if(encoder->protected_->blocksize <= 1152)
 712                                 encoder->protected_->qlp_coeff_precision = FLAC__MAX_QLP_COEFF_PRECISION-1;
 713                         else
 714                                 encoder->protected_->qlp_coeff_precision = FLAC__MAX_QLP_COEFF_PRECISION;
 715                 }
 716                 FLAC__ASSERT(encoder->protected_->qlp_coeff_precision <= FLAC__MAX_QLP_COEFF_PRECISION);
 717         }
 718         else if(encoder->protected_->qlp_coeff_precision < FLAC__MIN_QLP_COEFF_PRECISION || encoder->protected_->qlp_coeff_precision > FLAC__MAX_QLP_COEFF_PRECISION)
 719                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_QLP_COEFF_PRECISION;
 720
 721         if(encoder->protected_->streamable_subset) {
 722                 if(
 723                         encoder->protected_->blocksize != 192 &&
 724                         encoder->protected_->blocksize != 576 &&
 725                         encoder->protected_->blocksize != 1152 &&
 726                         encoder->protected_->blocksize != 2304 &&
 727                         encoder->protected_->blocksize != 4608 &&
 728                         encoder->protected_->blocksize != 256 &&
 729                         encoder->protected_->blocksize != 512 &&
 730                         encoder->protected_->blocksize != 1024 &&
 731                         encoder->protected_->blocksize != 2048 &&
 732                         encoder->protected_->blocksize != 4096 &&
 733                         encoder->protected_->blocksize != 8192 &&
 734                         encoder->protected_->blocksize != 16384
 735                 )
 736                         return FLAC__STREAM_ENCODER_INIT_STATUS_NOT_STREAMABLE;
 737                 if(
 738                         encoder->protected_->sample_rate != 8000 &&
 739                         encoder->protected_->sample_rate != 16000 &&
 740                         encoder->protected_->sample_rate != 22050 &&
 741                         encoder->protected_->sample_rate != 24000 &&
 742                         encoder->protected_->sample_rate != 32000 &&
 743                         encoder->protected_->sample_rate != 44100 &&
 744                         encoder->protected_->sample_rate != 48000 &&
 745                         encoder->protected_->sample_rate != 96000
 746                 )
 747                         return FLAC__STREAM_ENCODER_INIT_STATUS_NOT_STREAMABLE;
 748                 if(
 749                         encoder->protected_->bits_per_sample != 8 &&
 750                         encoder->protected_->bits_per_sample != 12 &&
 751                         encoder->protected_->bits_per_sample != 16 &&
 752                         encoder->protected_->bits_per_sample != 20 &&
 753                         encoder->protected_->bits_per_sample != 24
 754                 )
 755                         return FLAC__STREAM_ENCODER_INIT_STATUS_NOT_STREAMABLE;
 756                 if(encoder->protected_->max_residual_partition_order > FLAC__SUBSET_MAX_RICE_PARTITION_ORDER)
 757                         return FLAC__STREAM_ENCODER_INIT_STATUS_NOT_STREAMABLE;
 758                 if(
 759                         encoder->protected_->sample_rate <= 48000 &&
 760                         (
 761                                 encoder->protected_->blocksize > FLAC__SUBSET_MAX_BLOCK_SIZE_48000HZ ||
 762                                 encoder->protected_->max_lpc_order > FLAC__SUBSET_MAX_LPC_ORDER_48000HZ
 763                         )
 764                 ) {
 765                         return FLAC__STREAM_ENCODER_INIT_STATUS_NOT_STREAMABLE;
 766                 }
 767         }
 768
 769         if(encoder->protected_->max_residual_partition_order >= (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
 770                 encoder->protected_->max_residual_partition_order = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN) - 1;
 771         if(encoder->protected_->min_residual_partition_order >= encoder->protected_->max_residual_partition_order)
 772                 encoder->protected_->min_residual_partition_order = encoder->protected_->max_residual_partition_order;
 773
 774 #if FLAC__HAS_OGG
 775         /* reorder metadata if necessary to ensure that any VORBIS_COMMENT is the first, according to the mapping spec */
 776         if(is_ogg && 0 != encoder->protected_->metadata && encoder->protected_->num_metadata_blocks > 1) {
 777                 unsigned i;
 778                 for(i = 1; i < encoder->protected_->num_metadata_blocks; i++) {
 779                         if(0 != encoder->protected_->metadata[i] && encoder->protected_->metadata[i]->type == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
 780                                 FLAC__StreamMetadata *vc = encoder->protected_->metadata[i];
 781                                 for( ; i > 0; i--)
 782                                         encoder->protected_->metadata[i] = encoder->protected_->metadata[i-1];
 783                                 encoder->protected_->metadata[0] = vc;
 784                                 break;
 785                         }
 786                 }
 787         }
 788 #endif
 789         /* keep track of any SEEKTABLE block */
 790         if(0 != encoder->protected_->metadata && encoder->protected_->num_metadata_blocks > 0) {
 791                 unsigned i;
 792                 for(i = 0; i < encoder->protected_->num_metadata_blocks; i++) {
 793                         if(0 != encoder->protected_->metadata[i] && encoder->protected_->metadata[i]->type == FLAC__METADATA_TYPE_SEEKTABLE) {
 794                                 encoder->private_->seek_table = &encoder->protected_->metadata[i]->data.seek_table;
 795                                 break; /* take only the first one */
 796                         }
 797                 }
 798         }
 799
 800         /* validate metadata */
 801         if(0 == encoder->protected_->metadata && encoder->protected_->num_metadata_blocks > 0)
 802                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA;
 803         metadata_has_seektable = false;
 804         metadata_has_vorbis_comment = false;
 805         metadata_picture_has_type1 = false;
 806         metadata_picture_has_type2 = false;
 807         for(i = 0; i < encoder->protected_->num_metadata_blocks; i++) {
 808                 const FLAC__StreamMetadata *m = encoder->protected_->metadata[i];
 809                 if(m->type == FLAC__METADATA_TYPE_STREAMINFO)
 810                         return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA;
 811                 else if(m->type == FLAC__METADATA_TYPE_SEEKTABLE) {
 812                         if(metadata_has_seektable) /* only one is allowed */
 813                                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA;
 814                         metadata_has_seektable = true;
 815                         if(!FLAC__format_seektable_is_legal(&m->data.seek_table))
 816                                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA;
 817                 }
 818                 else if(m->type == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
 819                         if(metadata_has_vorbis_comment) /* only one is allowed */
 820                                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA;
 821                         metadata_has_vorbis_comment = true;
 822                 }
 823                 else if(m->type == FLAC__METADATA_TYPE_CUESHEET) {
 824                         if(!FLAC__format_cuesheet_is_legal(&m->data.cue_sheet, m->data.cue_sheet.is_cd, /*violation=*/0))
 825                                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA;
 826                 }
 827                 else if(m->type == FLAC__METADATA_TYPE_PICTURE) {
 828                         if(!FLAC__format_picture_is_legal(&m->data.picture, /*violation=*/0))
 829                                 return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA;
 830                         if(m->data.picture.type == FLAC__STREAM_METADATA_PICTURE_TYPE_FILE_ICON_STANDARD) {
 831                                 if(metadata_picture_has_type1) /* there should only be 1 per stream */
 832                                         return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA;
 833                                 metadata_picture_has_type1 = true;
 834                                 /* standard icon must be 32x32 pixel PNG */
 835                                 if(
 836                                         m->data.picture.type == FLAC__STREAM_METADATA_PICTURE_TYPE_FILE_ICON_STANDARD &&
 837                                         (
 838                                                 (strcmp(m->data.picture.mime_type, "image/png") && strcmp(m->data.picture.mime_type, "-->")) ||
 839                                                 m->data.picture.width != 32 ||
 840                                                 m->data.picture.height != 32
 841                                         )
 842                                 )
 843                                         return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA;
 844                         }
 845                         else if(m->data.picture.type == FLAC__STREAM_METADATA_PICTURE_TYPE_FILE_ICON) {
 846                                 if(metadata_picture_has_type2) /* there should only be 1 per stream */
 847                                         return FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA;
 848                                 metadata_picture_has_type2 = true;
 849                         }
 850                 }
 851         }
 852
 853         encoder->private_->input_capacity = 0;
 854         for(i = 0; i < encoder->protected_->channels; i++) {
 855                 encoder->private_->integer_signal_unaligned[i] = encoder->private_->integer_signal[i] = 0;
 856 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 857                 encoder->private_->real_signal_unaligned[i] = encoder->private_->real_signal[i] = 0;
 858 #endif
 859         }
 860         for(i = 0; i < 2; i++) {
 861                 encoder->private_->integer_signal_mid_side_unaligned[i] = encoder->private_->integer_signal_mid_side[i] = 0;
 862 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 863                 encoder->private_->real_signal_mid_side_unaligned[i] = encoder->private_->real_signal_mid_side[i] = 0;
 864 #endif
 865         }
 866 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 867         for(i = 0; i < encoder->protected_->num_apodizations; i++)
 868                 encoder->private_->window_unaligned[i] = encoder->private_->window[i] = 0;
 869         encoder->private_->windowed_signal_unaligned = encoder->private_->windowed_signal = 0;
 870 #endif
 871         for(i = 0; i < encoder->protected_->channels; i++) {
 872                 encoder->private_->residual_workspace_unaligned[i][0] = encoder->private_->residual_workspace[i][0] = 0;
 873                 encoder->private_->residual_workspace_unaligned[i][1] = encoder->private_->residual_workspace[i][1] = 0;
 874                 encoder->private_->best_subframe[i] = 0;
 875         }
 876         for(i = 0; i < 2; i++) {
 877                 encoder->private_->residual_workspace_mid_side_unaligned[i][0] = encoder->private_->residual_workspace_mid_side[i][0] = 0;
 878                 encoder->private_->residual_workspace_mid_side_unaligned[i][1] = encoder->private_->residual_workspace_mid_side[i][1] = 0;
 879                 encoder->private_->best_subframe_mid_side[i] = 0;
 880         }
 881         encoder->private_->abs_residual_partition_sums_unaligned = encoder->private_->abs_residual_partition_sums = 0;
 882         encoder->private_->raw_bits_per_partition_unaligned = encoder->private_->raw_bits_per_partition = 0;
 883 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 884         encoder->private_->loose_mid_side_stereo_frames = (unsigned)((FLAC__double)encoder->protected_->sample_rate * 0.4 / (FLAC__double)encoder->protected_->blocksize + 0.5);
 885 #else
 886         /* 26214 is the approximate fixed-point equivalent to 0.4 (0.4 * 2^16) */
 887         /* sample rate can be up to 655350 Hz, and thus use 20 bits, so we do the multiply&divide by hand */
 888         FLAC__ASSERT(FLAC__MAX_SAMPLE_RATE <= 655350);
 889         FLAC__ASSERT(FLAC__MAX_BLOCK_SIZE <= 65535);
 890         FLAC__ASSERT(encoder->protected_->sample_rate <= 655350);
 891         FLAC__ASSERT(encoder->protected_->blocksize <= 65535);
 892         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);
 893 #endif
 894         if(encoder->private_->loose_mid_side_stereo_frames == 0)
 895                 encoder->private_->loose_mid_side_stereo_frames = 1;
 896         encoder->private_->loose_mid_side_stereo_frame_count = 0;
 897         encoder->private_->current_sample_number = 0;
 898         encoder->private_->current_frame_number = 0;
 899
 900         encoder->private_->use_wide_by_block = (encoder->protected_->bits_per_sample + FLAC__bitmath_ilog2(encoder->protected_->blocksize)+1 > 30);
 901         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? */
 902         encoder->private_->use_wide_by_partition = (false); /*@@@ need to set this */
 903
 904         /*
 905          * get the CPU info and set the function pointers
 906          */
 907         FLAC__cpu_info(&encoder->private_->cpuinfo);
 908         /* first default to the non-asm routines */
 909 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 910         encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation;
 911 #endif
 912         encoder->private_->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor;
 913 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 914         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients;
 915         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_64bit = FLAC__lpc_compute_residual_from_qlp_coefficients_wide;
 916         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients;
 917 #endif
 918         /* now override with asm where appropriate */
 919 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 920 # ifndef FLAC__NO_ASM
 921         if(encoder->private_->cpuinfo.use_asm) {
 922 #  ifdef FLAC__CPU_IA32
 923                 FLAC__ASSERT(encoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
 924 #   ifdef FLAC__HAS_NASM
 925 #    ifdef FLAC__SSE_OS
 926                 if(encoder->private_->cpuinfo.data.ia32.sse) {
 927                         if(encoder->protected_->max_lpc_order < 4)
 928                                 encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_4;
 929                         else if(encoder->protected_->max_lpc_order < 8)
 930                                 encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_8;
 931                         else if(encoder->protected_->max_lpc_order < 12)
 932                                 encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_12;
 933                         else
 934                                 encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32;
 935                 }
 936                 else
 937 #    endif /* FLAC__SSE_OS */
 938                 if(encoder->private_->cpuinfo.data.ia32._3dnow)
 939                         encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_3dnow;
 940                 else
 941                         encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32;
 942                 if(encoder->private_->cpuinfo.data.ia32.mmx) {
 943                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
 944                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32_mmx;
 945                 }
 946                 else {
 947                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
 948                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
 949                 }
 950                 if(encoder->private_->cpuinfo.data.ia32.mmx && encoder->private_->cpuinfo.data.ia32.cmov)
 951                         encoder->private_->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor_asm_ia32_mmx_cmov;
 952 #   endif /* FLAC__HAS_NASM */
 953 #  endif /* FLAC__CPU_IA32 */
 954         }
 955 # endif /* !FLAC__NO_ASM */
 956 #endif /* !FLAC__INTEGER_ONLY_LIBRARY */
 957         /* finally override based on wide-ness if necessary */
 958         if(encoder->private_->use_wide_by_block) {
 959                 encoder->private_->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor_wide;
 960         }
 961
 962         /* set state to OK; from here on, errors are fatal and we'll override the state then */
 963         encoder->protected_->state = FLAC__STREAM_ENCODER_OK;
 964
 965 #if FLAC__HAS_OGG
 966         encoder->private_->is_ogg = is_ogg;
 967         if(is_ogg && !FLAC__ogg_encoder_aspect_init(&encoder->protected_->ogg_encoder_aspect)) {
 968                 encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
 969                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
 970         }
 971 #endif
 972
 973         encoder->private_->read_callback = read_callback;
 974         encoder->private_->write_callback = write_callback;
 975         encoder->private_->seek_callback = seek_callback;
 976         encoder->private_->tell_callback = tell_callback;
 977         encoder->private_->metadata_callback = metadata_callback;
 978         encoder->private_->client_data = client_data;
 979
 980         if(!resize_buffers_(encoder, encoder->protected_->blocksize)) {
 981                 /* the above function sets the state for us in case of an error */
 982                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
 983         }
 984
 985         if(!FLAC__bitwriter_init(encoder->private_->frame)) {
 986                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
 987                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
 988         }
 989
 990         /*
 991          * Set up the verify stuff if necessary
 992          */
 993         if(encoder->protected_->verify) {
 994                 /*
 995                  * First, set up the fifo which will hold the
 996                  * original signal to compare against
 997                  */
 998                 encoder->private_->verify.input_fifo.size = encoder->protected_->blocksize+OVERREAD_;
 999                 for(i = 0; i < encoder->protected_->channels; i++) {
1000                         if(0 == (encoder->private_->verify.input_fifo.data[i] = (FLAC__int32*)malloc(sizeof(FLAC__int32) * encoder->private_->verify.input_fifo.size))) {
1001                                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
1002                                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1003                         }
1004                 }
1005                 encoder->private_->verify.input_fifo.tail = 0;
1006
1007                 /*
1008                  * Now set up a stream decoder for verification
1009                  */
1010                 encoder->private_->verify.decoder = FLAC__stream_decoder_new();
1011                 if(0 == encoder->private_->verify.decoder) {
1012                         encoder->protected_->state = FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR;
1013                         return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1014                 }
1015
1016                 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) {
1017                         encoder->protected_->state = FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR;
1018                         return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1019                 }
1020         }
1021         encoder->private_->verify.error_stats.absolute_sample = 0;
1022         encoder->private_->verify.error_stats.frame_number = 0;
1023         encoder->private_->verify.error_stats.channel = 0;
1024         encoder->private_->verify.error_stats.sample = 0;
1025         encoder->private_->verify.error_stats.expected = 0;
1026         encoder->private_->verify.error_stats.got = 0;
1027
1028         /*
1029          * These must be done before we write any metadata, because that
1030          * calls the write_callback, which uses these values.
1031          */
1032         encoder->private_->first_seekpoint_to_check = 0;
1033         encoder->private_->samples_written = 0;
1034         encoder->protected_->streaminfo_offset = 0;
1035         encoder->protected_->seektable_offset = 0;
1036         encoder->protected_->audio_offset = 0;
1037
1038         /*
1039          * write the stream header
1040          */
1041         if(encoder->protected_->verify)
1042                 encoder->private_->verify.state_hint = ENCODER_IN_MAGIC;
1043         if(!FLAC__bitwriter_write_raw_uint32(encoder->private_->frame, FLAC__STREAM_SYNC, FLAC__STREAM_SYNC_LEN)) {
1044                 encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
1045                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1046         }
1047         if(!write_bitbuffer_(encoder, 0, /*is_last_block=*/false)) {
1048                 /* the above function sets the state for us in case of an error */
1049                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1050         }
1051
1052         /*
1053          * write the STREAMINFO metadata block
1054          */
1055         if(encoder->protected_->verify)
1056                 encoder->private_->verify.state_hint = ENCODER_IN_METADATA;
1057         encoder->private_->streaminfo.type = FLAC__METADATA_TYPE_STREAMINFO;
1058         encoder->private_->streaminfo.is_last = false; /* we will have at a minimum a VORBIS_COMMENT afterwards */
1059         encoder->private_->streaminfo.length = FLAC__STREAM_METADATA_STREAMINFO_LENGTH;
1060         encoder->private_->streaminfo.data.stream_info.min_blocksize = encoder->protected_->blocksize; /* this encoder uses the same blocksize for the whole stream */
1061         encoder->private_->streaminfo.data.stream_info.max_blocksize = encoder->protected_->blocksize;
1062         encoder->private_->streaminfo.data.stream_info.min_framesize = 0; /* we don't know this yet; have to fill it in later */
1063         encoder->private_->streaminfo.data.stream_info.max_framesize = 0; /* we don't know this yet; have to fill it in later */
1064         encoder->private_->streaminfo.data.stream_info.sample_rate = encoder->protected_->sample_rate;
1065         encoder->private_->streaminfo.data.stream_info.channels = encoder->protected_->channels;
1066         encoder->private_->streaminfo.data.stream_info.bits_per_sample = encoder->protected_->bits_per_sample;
1067         encoder->private_->streaminfo.data.stream_info.total_samples = encoder->protected_->total_samples_estimate; /* we will replace this later with the real total */
1068         memset(encoder->private_->streaminfo.data.stream_info.md5sum, 0, 16); /* we don't know this yet; have to fill it in later */
1069         FLAC__MD5Init(&encoder->private_->md5context);
1070         if(!FLAC__add_metadata_block(&encoder->private_->streaminfo, encoder->private_->frame)) {
1071                 encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
1072                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1073         }
1074         if(!write_bitbuffer_(encoder, 0, /*is_last_block=*/false)) {
1075                 /* the above function sets the state for us in case of an error */
1076                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1077         }
1078
1079         /*
1080          * Now that the STREAMINFO block is written, we can init this to an
1081          * absurdly-high value...
1082          */
1083         encoder->private_->streaminfo.data.stream_info.min_framesize = (1u << FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN) - 1;
1084         /* ... and clear this to 0 */
1085         encoder->private_->streaminfo.data.stream_info.total_samples = 0;
1086
1087         /*
1088          * Check to see if the supplied metadata contains a VORBIS_COMMENT;
1089          * if not, we will write an empty one (FLAC__add_metadata_block()
1090          * automatically supplies the vendor string).
1091          *
1092          * WATCHOUT: the Ogg FLAC mapping requires us to write this block after
1093          * the STREAMINFO.  (In the case that metadata_has_vorbis_comment is
1094          * true it will have already insured that the metadata list is properly
1095          * ordered.)
1096          */
1097         if(!metadata_has_vorbis_comment) {
1098                 FLAC__StreamMetadata vorbis_comment;
1099                 vorbis_comment.type = FLAC__METADATA_TYPE_VORBIS_COMMENT;
1100                 vorbis_comment.is_last = (encoder->protected_->num_metadata_blocks == 0);
1101                 vorbis_comment.length = 4 + 4; /* MAGIC NUMBER */
1102                 vorbis_comment.data.vorbis_comment.vendor_string.length = 0;
1103                 vorbis_comment.data.vorbis_comment.vendor_string.entry = 0;
1104                 vorbis_comment.data.vorbis_comment.num_comments = 0;
1105                 vorbis_comment.data.vorbis_comment.comments = 0;
1106                 if(!FLAC__add_metadata_block(&vorbis_comment, encoder->private_->frame)) {
1107                         encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
1108                         return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1109                 }
1110                 if(!write_bitbuffer_(encoder, 0, /*is_last_block=*/false)) {
1111                         /* the above function sets the state for us in case of an error */
1112                         return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1113                 }
1114         }
1115
1116         /*
1117          * write the user's metadata blocks
1118          */
1119         for(i = 0; i < encoder->protected_->num_metadata_blocks; i++) {
1120                 encoder->protected_->metadata[i]->is_last = (i == encoder->protected_->num_metadata_blocks - 1);
1121                 if(!FLAC__add_metadata_block(encoder->protected_->metadata[i], encoder->private_->frame)) {
1122                         encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
1123                         return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1124                 }
1125                 if(!write_bitbuffer_(encoder, 0, /*is_last_block=*/false)) {
1126                         /* the above function sets the state for us in case of an error */
1127                         return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1128                 }
1129         }
1130
1131         /* now that all the metadata is written, we save the stream offset */
1132         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 */
1133                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
1134                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1135         }
1136
1137         if(encoder->protected_->verify)
1138                 encoder->private_->verify.state_hint = ENCODER_IN_AUDIO;
1139
1140         return FLAC__STREAM_ENCODER_INIT_STATUS_OK;
1141 }
1142
1143 FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_stream(
1144         FLAC__StreamEncoder *encoder,
1145         FLAC__StreamEncoderWriteCallback write_callback,
1146         FLAC__StreamEncoderSeekCallback seek_callback,
1147         FLAC__StreamEncoderTellCallback tell_callback,
1148         FLAC__StreamEncoderMetadataCallback metadata_callback,
1149         void *client_data
1150 )
1151 {
1152         return init_stream_internal_(
1153                 encoder,
1154                 /*read_callback=*/0,
1155                 write_callback,
1156                 seek_callback,
1157                 tell_callback,
1158                 metadata_callback,
1159                 client_data,
1160                 /*is_ogg=*/false
1161         );
1162 }
1163
1164 FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_ogg_stream(
1165         FLAC__StreamEncoder *encoder,
1166         FLAC__StreamEncoderReadCallback read_callback,
1167         FLAC__StreamEncoderWriteCallback write_callback,
1168         FLAC__StreamEncoderSeekCallback seek_callback,
1169         FLAC__StreamEncoderTellCallback tell_callback,
1170         FLAC__StreamEncoderMetadataCallback metadata_callback,
1171         void *client_data
1172 )
1173 {
1174         return init_stream_internal_(
1175                 encoder,
1176                 read_callback,
1177                 write_callback,
1178                 seek_callback,
1179                 tell_callback,
1180                 metadata_callback,
1181                 client_data,
1182                 /*is_ogg=*/true
1183         );
1184 }
1185
1186 static FLAC__StreamEncoderInitStatus init_FILE_internal_(
1187         FLAC__StreamEncoder *encoder,
1188         FILE *file,
1189         FLAC__StreamEncoderProgressCallback progress_callback,
1190         void *client_data,
1191         FLAC__bool is_ogg
1192 )
1193 {
1194         FLAC__StreamEncoderInitStatus init_status;
1195
1196         FLAC__ASSERT(0 != encoder);
1197         FLAC__ASSERT(0 != file);
1198
1199         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1200                 return FLAC__STREAM_ENCODER_INIT_STATUS_ALREADY_INITIALIZED;
1201
1202         /* double protection */
1203         if(file == 0) {
1204                 encoder->protected_->state = FLAC__STREAM_ENCODER_IO_ERROR;
1205                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1206         }
1207
1208         /*
1209          * To make sure that our file does not go unclosed after an error, we
1210          * must assign the FILE pointer before any further error can occur in
1211          * this routine.
1212          */
1213         if(file == stdout)
1214                 file = get_binary_stdout_(); /* just to be safe */
1215
1216         encoder->private_->file = file;
1217
1218         encoder->private_->progress_callback = progress_callback;
1219         encoder->private_->bytes_written = 0;
1220         encoder->private_->samples_written = 0;
1221         encoder->private_->frames_written = 0;
1222
1223         init_status = init_stream_internal_(
1224                 encoder,
1225                 encoder->private_->file == stdout? 0 : is_ogg? file_read_callback_ : 0,
1226                 file_write_callback_,
1227                 encoder->private_->file == stdout? 0 : file_seek_callback_,
1228                 encoder->private_->file == stdout? 0 : file_tell_callback_,
1229                 /*metadata_callback=*/0,
1230                 client_data,
1231                 is_ogg
1232         );
1233         if(init_status != FLAC__STREAM_ENCODER_INIT_STATUS_OK) {
1234                 /* the above function sets the state for us in case of an error */
1235                 return init_status;
1236         }
1237
1238         {
1239                 unsigned blocksize = FLAC__stream_encoder_get_blocksize(encoder);
1240
1241                 FLAC__ASSERT(blocksize != 0);
1242                 encoder->private_->total_frames_estimate = (unsigned)((FLAC__stream_encoder_get_total_samples_estimate(encoder) + blocksize - 1) / blocksize);
1243         }
1244
1245         return init_status;
1246 }
1247
1248 FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_FILE(
1249         FLAC__StreamEncoder *encoder,
1250         FILE *file,
1251         FLAC__StreamEncoderProgressCallback progress_callback,
1252         void *client_data
1253 )
1254 {
1255         return init_FILE_internal_(encoder, file, progress_callback, client_data, /*is_ogg=*/false);
1256 }
1257
1258 FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_ogg_FILE(
1259         FLAC__StreamEncoder *encoder,
1260         FILE *file,
1261         FLAC__StreamEncoderProgressCallback progress_callback,
1262         void *client_data
1263 )
1264 {
1265         return init_FILE_internal_(encoder, file, progress_callback, client_data, /*is_ogg=*/true);
1266 }
1267
1268 static FLAC__StreamEncoderInitStatus init_file_internal_(
1269         FLAC__StreamEncoder *encoder,
1270         const char *filename,
1271         FLAC__StreamEncoderProgressCallback progress_callback,
1272         void *client_data,
1273         FLAC__bool is_ogg
1274 )
1275 {
1276         FILE *file;
1277
1278         FLAC__ASSERT(0 != encoder);
1279
1280         /*
1281          * To make sure that our file does not go unclosed after an error, we
1282          * have to do the same entrance checks here that are later performed
1283          * in FLAC__stream_encoder_init_FILE() before the FILE* is assigned.
1284          */
1285         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1286                 return FLAC__STREAM_ENCODER_INIT_STATUS_ALREADY_INITIALIZED;
1287
1288         file = filename? fopen(filename, "w+b") : stdout;
1289
1290         if(file == 0) {
1291                 encoder->protected_->state = FLAC__STREAM_ENCODER_IO_ERROR;
1292                 return FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR;
1293         }
1294
1295         return init_FILE_internal_(encoder, file, progress_callback, client_data, is_ogg);
1296 }
1297
1298 FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_file(
1299         FLAC__StreamEncoder *encoder,
1300         const char *filename,
1301         FLAC__StreamEncoderProgressCallback progress_callback,
1302         void *client_data
1303 )
1304 {
1305         return init_file_internal_(encoder, filename, progress_callback, client_data, /*is_ogg=*/false);
1306 }
1307
1308 FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_ogg_file(
1309         FLAC__StreamEncoder *encoder,
1310         const char *filename,
1311         FLAC__StreamEncoderProgressCallback progress_callback,
1312         void *client_data
1313 )
1314 {
1315         return init_file_internal_(encoder, filename, progress_callback, client_data, /*is_ogg=*/true);
1316 }
1317
1318 FLAC_API FLAC__bool FLAC__stream_encoder_finish(FLAC__StreamEncoder *encoder)
1319 {
1320         FLAC__bool error = false;
1321
1322         FLAC__ASSERT(0 != encoder);
1323         FLAC__ASSERT(0 != encoder->private_);
1324         FLAC__ASSERT(0 != encoder->protected_);
1325
1326         if(encoder->protected_->state == FLAC__STREAM_ENCODER_UNINITIALIZED)
1327                 return true;
1328
1329         if(encoder->protected_->state == FLAC__STREAM_ENCODER_OK && !encoder->private_->is_being_deleted) {
1330                 if(encoder->private_->current_sample_number != 0) {
1331                         const FLAC__bool is_fractional_block = encoder->protected_->blocksize != encoder->private_->current_sample_number;
1332                         encoder->protected_->blocksize = encoder->private_->current_sample_number;
1333                         if(!process_frame_(encoder, is_fractional_block, /*is_last_block=*/true))
1334                                 error = true;
1335                 }
1336         }
1337
1338         FLAC__MD5Final(encoder->private_->streaminfo.data.stream_info.md5sum, &encoder->private_->md5context);
1339
1340         if(!encoder->private_->is_being_deleted) {
1341                 if(encoder->protected_->state == FLAC__STREAM_ENCODER_OK) {
1342                         if(encoder->private_->seek_callback) {
1343 #if FLAC__HAS_OGG
1344                                 if(encoder->private_->is_ogg)
1345                                         update_ogg_metadata_(encoder);
1346                                 else
1347 #endif
1348                                 update_metadata_(encoder);
1349
1350                                 /* check if an error occurred while updating metadata */
1351                                 if(encoder->protected_->state != FLAC__STREAM_ENCODER_OK)
1352                                         error = true;
1353                         }
1354                         if(encoder->private_->metadata_callback)
1355                                 encoder->private_->metadata_callback(encoder, &encoder->private_->streaminfo, encoder->private_->client_data);
1356                 }
1357
1358                 if(encoder->protected_->verify && 0 != encoder->private_->verify.decoder && !FLAC__stream_decoder_finish(encoder->private_->verify.decoder)) {
1359                         if(!error)
1360                                 encoder->protected_->state = FLAC__STREAM_ENCODER_VERIFY_MISMATCH_IN_AUDIO_DATA;
1361                         error = true;
1362                 }
1363         }
1364
1365         if(0 != encoder->private_->file) {
1366                 if(encoder->private_->file != stdout)
1367                         fclose(encoder->private_->file);
1368                 encoder->private_->file = 0;
1369         }
1370
1371 #if FLAC__HAS_OGG
1372         if(encoder->private_->is_ogg)
1373                 FLAC__ogg_encoder_aspect_finish(&encoder->protected_->ogg_encoder_aspect);
1374 #endif
1375
1376         free_(encoder);
1377         set_defaults_(encoder);
1378
1379         if(!error)
1380                 encoder->protected_->state = FLAC__STREAM_ENCODER_UNINITIALIZED;
1381
1382         return !error;
1383 }
1384
1385 FLAC_API FLAC__bool FLAC__stream_encoder_set_ogg_serial_number(FLAC__StreamEncoder *encoder, long value)
1386 {
1387         FLAC__ASSERT(0 != encoder);
1388         FLAC__ASSERT(0 != encoder->private_);
1389         FLAC__ASSERT(0 != encoder->protected_);
1390         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1391                 return false;
1392 #if FLAC__HAS_OGG
1393         /* can't check encoder->private_->is_ogg since that's not set until init time */
1394         FLAC__ogg_encoder_aspect_set_serial_number(&encoder->protected_->ogg_encoder_aspect, value);
1395         return true;
1396 #else
1397         (void)value;
1398         return false;
1399 #endif
1400 }
1401
1402 FLAC_API FLAC__bool FLAC__stream_encoder_set_verify(FLAC__StreamEncoder *encoder, FLAC__bool value)
1403 {
1404         FLAC__ASSERT(0 != encoder);
1405         FLAC__ASSERT(0 != encoder->private_);
1406         FLAC__ASSERT(0 != encoder->protected_);
1407         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1408                 return false;
1409 #ifndef FLAC__MANDATORY_VERIFY_WHILE_ENCODING
1410         encoder->protected_->verify = value;
1411 #endif
1412         return true;
1413 }
1414
1415 FLAC_API FLAC__bool FLAC__stream_encoder_set_streamable_subset(FLAC__StreamEncoder *encoder, FLAC__bool value)
1416 {
1417         FLAC__ASSERT(0 != encoder);
1418         FLAC__ASSERT(0 != encoder->private_);
1419         FLAC__ASSERT(0 != encoder->protected_);
1420         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1421                 return false;
1422         encoder->protected_->streamable_subset = value;
1423         return true;
1424 }
1425
1426 FLAC_API FLAC__bool FLAC__stream_encoder_set_channels(FLAC__StreamEncoder *encoder, unsigned value)
1427 {
1428         FLAC__ASSERT(0 != encoder);
1429         FLAC__ASSERT(0 != encoder->private_);
1430         FLAC__ASSERT(0 != encoder->protected_);
1431         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1432                 return false;
1433         encoder->protected_->channels = value;
1434         return true;
1435 }
1436
1437 FLAC_API FLAC__bool FLAC__stream_encoder_set_bits_per_sample(FLAC__StreamEncoder *encoder, unsigned value)
1438 {
1439         FLAC__ASSERT(0 != encoder);
1440         FLAC__ASSERT(0 != encoder->private_);
1441         FLAC__ASSERT(0 != encoder->protected_);
1442         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1443                 return false;
1444         encoder->protected_->bits_per_sample = value;
1445         return true;
1446 }
1447
1448 FLAC_API FLAC__bool FLAC__stream_encoder_set_sample_rate(FLAC__StreamEncoder *encoder, unsigned value)
1449 {
1450         FLAC__ASSERT(0 != encoder);
1451         FLAC__ASSERT(0 != encoder->private_);
1452         FLAC__ASSERT(0 != encoder->protected_);
1453         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1454                 return false;
1455         encoder->protected_->sample_rate = value;
1456         return true;
1457 }
1458
1459 FLAC_API FLAC__bool FLAC__stream_encoder_set_compression_level(FLAC__StreamEncoder *encoder, unsigned value)
1460 {
1461         FLAC__bool ok = true;
1462         FLAC__ASSERT(0 != encoder);
1463         FLAC__ASSERT(0 != encoder->private_);
1464         FLAC__ASSERT(0 != encoder->protected_);
1465         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1466                 return false;
1467         if(value >= sizeof(compression_levels_)/sizeof(compression_levels_[0]))
1468                 value = sizeof(compression_levels_)/sizeof(compression_levels_[0]) - 1;
1469         ok &= FLAC__stream_encoder_set_do_mid_side_stereo          (encoder, compression_levels_[value].do_mid_side_stereo);
1470         ok &= FLAC__stream_encoder_set_loose_mid_side_stereo       (encoder, compression_levels_[value].loose_mid_side_stereo);
1471 #if 0
1472         /* was: */
1473         ok &= FLAC__stream_encoder_set_apodization                 (encoder, compression_levels_[value].apodization);
1474         /* but it's too hard to specify the string in a locale-specific way */
1475 #else
1476         encoder->protected_->num_apodizations = 1;
1477         encoder->protected_->apodizations[0].type = FLAC__APODIZATION_TUKEY;
1478         encoder->protected_->apodizations[0].parameters.tukey.p = 0.5;
1479 #endif
1480         ok &= FLAC__stream_encoder_set_max_lpc_order               (encoder, compression_levels_[value].max_lpc_order);
1481         ok &= FLAC__stream_encoder_set_qlp_coeff_precision         (encoder, compression_levels_[value].qlp_coeff_precision);
1482         ok &= FLAC__stream_encoder_set_do_qlp_coeff_prec_search    (encoder, compression_levels_[value].do_qlp_coeff_prec_search);
1483         ok &= FLAC__stream_encoder_set_do_escape_coding            (encoder, compression_levels_[value].do_escape_coding);
1484         ok &= FLAC__stream_encoder_set_do_exhaustive_model_search  (encoder, compression_levels_[value].do_exhaustive_model_search);
1485         ok &= FLAC__stream_encoder_set_min_residual_partition_order(encoder, compression_levels_[value].min_residual_partition_order);
1486         ok &= FLAC__stream_encoder_set_max_residual_partition_order(encoder, compression_levels_[value].max_residual_partition_order);
1487         ok &= FLAC__stream_encoder_set_rice_parameter_search_dist  (encoder, compression_levels_[value].rice_parameter_search_dist);
1488         return ok;
1489 }
1490
1491 FLAC_API FLAC__bool FLAC__stream_encoder_set_blocksize(FLAC__StreamEncoder *encoder, unsigned value)
1492 {
1493         FLAC__ASSERT(0 != encoder);
1494         FLAC__ASSERT(0 != encoder->private_);
1495         FLAC__ASSERT(0 != encoder->protected_);
1496         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1497                 return false;
1498         encoder->protected_->blocksize = value;
1499         return true;
1500 }
1501
1502 FLAC_API FLAC__bool FLAC__stream_encoder_set_do_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value)
1503 {
1504         FLAC__ASSERT(0 != encoder);
1505         FLAC__ASSERT(0 != encoder->private_);
1506         FLAC__ASSERT(0 != encoder->protected_);
1507         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1508                 return false;
1509         encoder->protected_->do_mid_side_stereo = value;
1510         return true;
1511 }
1512
1513 FLAC_API FLAC__bool FLAC__stream_encoder_set_loose_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value)
1514 {
1515         FLAC__ASSERT(0 != encoder);
1516         FLAC__ASSERT(0 != encoder->private_);
1517         FLAC__ASSERT(0 != encoder->protected_);
1518         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1519                 return false;
1520         encoder->protected_->loose_mid_side_stereo = value;
1521         return true;
1522 }
1523
1524 FLAC_API FLAC__bool FLAC__stream_encoder_set_apodization(FLAC__StreamEncoder *encoder, const char *specification)
1525 {
1526         FLAC__ASSERT(0 != encoder);
1527         FLAC__ASSERT(0 != encoder->private_);
1528         FLAC__ASSERT(0 != encoder->protected_);
1529         FLAC__ASSERT(0 != specification);
1530         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1531                 return false;
1532 #ifdef FLAC__INTEGER_ONLY_LIBRARY
1533         (void)specification; /* silently ignore since we haven't integerized; will always use a rectangular window */
1534 #else
1535         encoder->protected_->num_apodizations = 0;
1536         while(1) {
1537                 const char *s = strchr(specification, ';');
1538                 const size_t n = s? (size_t)(s - specification) : strlen(specification);
1539                 if     (n==8  && 0 == strncmp("bartlett"     , specification, n))
1540                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_BARTLETT;
1541                 else if(n==13 && 0 == strncmp("bartlett_hann", specification, n))
1542                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_BARTLETT_HANN;
1543                 else if(n==8  && 0 == strncmp("blackman"     , specification, n))
1544                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_BLACKMAN;
1545                 else if(n==26 && 0 == strncmp("blackman_harris_4term_92db", specification, n))
1546                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_BLACKMAN_HARRIS_4TERM_92DB_SIDELOBE;
1547                 else if(n==6  && 0 == strncmp("connes"       , specification, n))
1548                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_CONNES;
1549                 else if(n==7  && 0 == strncmp("flattop"      , specification, n))
1550                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_FLATTOP;
1551                 else if(n>7   && 0 == strncmp("gauss("       , specification, 6)) {
1552                         FLAC__real stddev = (FLAC__real)strtod(specification+6, 0);
1553                         if (stddev > 0.0 && stddev <= 0.5) {
1554                                 encoder->protected_->apodizations[encoder->protected_->num_apodizations].parameters.gauss.stddev = stddev;
1555                                 encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_GAUSS;
1556                         }
1557                 }
1558                 else if(n==7  && 0 == strncmp("hamming"      , specification, n))
1559                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_HAMMING;
1560                 else if(n==4  && 0 == strncmp("hann"         , specification, n))
1561                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_HANN;
1562                 else if(n==13 && 0 == strncmp("kaiser_bessel", specification, n))
1563                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_KAISER_BESSEL;
1564                 else if(n==7  && 0 == strncmp("nuttall"      , specification, n))
1565                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_NUTTALL;
1566                 else if(n==9  && 0 == strncmp("rectangle"    , specification, n))
1567                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_RECTANGLE;
1568                 else if(n==8  && 0 == strncmp("triangle"     , specification, n))
1569                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_TRIANGLE;
1570                 else if(n>7   && 0 == strncmp("tukey("       , specification, 6)) {
1571                         FLAC__real p = (FLAC__real)strtod(specification+6, 0);
1572                         if (p >= 0.0 && p <= 1.0) {
1573                                 encoder->protected_->apodizations[encoder->protected_->num_apodizations].parameters.tukey.p = p;
1574                                 encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_TUKEY;
1575                         }
1576                 }
1577                 else if(n==5  && 0 == strncmp("welch"        , specification, n))
1578                         encoder->protected_->apodizations[encoder->protected_->num_apodizations++].type = FLAC__APODIZATION_WELCH;
1579                 if (encoder->protected_->num_apodizations == 32)
1580                         break;
1581                 if (s)
1582                         specification = s+1;
1583                 else
1584                         break;
1585         }
1586         if(encoder->protected_->num_apodizations == 0) {
1587                 encoder->protected_->num_apodizations = 1;
1588                 encoder->protected_->apodizations[0].type = FLAC__APODIZATION_TUKEY;
1589                 encoder->protected_->apodizations[0].parameters.tukey.p = 0.5;
1590         }
1591 #endif
1592         return true;
1593 }
1594
1595 FLAC_API FLAC__bool FLAC__stream_encoder_set_max_lpc_order(FLAC__StreamEncoder *encoder, unsigned value)
1596 {
1597         FLAC__ASSERT(0 != encoder);
1598         FLAC__ASSERT(0 != encoder->private_);
1599         FLAC__ASSERT(0 != encoder->protected_);
1600         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1601                 return false;
1602         encoder->protected_->max_lpc_order = value;
1603         return true;
1604 }
1605
1606 FLAC_API FLAC__bool FLAC__stream_encoder_set_qlp_coeff_precision(FLAC__StreamEncoder *encoder, unsigned value)
1607 {
1608         FLAC__ASSERT(0 != encoder);
1609         FLAC__ASSERT(0 != encoder->private_);
1610         FLAC__ASSERT(0 != encoder->protected_);
1611         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1612                 return false;
1613         encoder->protected_->qlp_coeff_precision = value;
1614         return true;
1615 }
1616
1617 FLAC_API FLAC__bool FLAC__stream_encoder_set_do_qlp_coeff_prec_search(FLAC__StreamEncoder *encoder, FLAC__bool value)
1618 {
1619         FLAC__ASSERT(0 != encoder);
1620         FLAC__ASSERT(0 != encoder->private_);
1621         FLAC__ASSERT(0 != encoder->protected_);
1622         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1623                 return false;
1624         encoder->protected_->do_qlp_coeff_prec_search = value;
1625         return true;
1626 }
1627
1628 FLAC_API FLAC__bool FLAC__stream_encoder_set_do_escape_coding(FLAC__StreamEncoder *encoder, FLAC__bool value)
1629 {
1630         FLAC__ASSERT(0 != encoder);
1631         FLAC__ASSERT(0 != encoder->private_);
1632         FLAC__ASSERT(0 != encoder->protected_);
1633         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1634                 return false;
1635 #if 0
1636         /*@@@ deprecated: */
1637         encoder->protected_->do_escape_coding = value;
1638 #else
1639         (void)value;
1640 #endif
1641         return true;
1642 }
1643
1644 FLAC_API FLAC__bool FLAC__stream_encoder_set_do_exhaustive_model_search(FLAC__StreamEncoder *encoder, FLAC__bool value)
1645 {
1646         FLAC__ASSERT(0 != encoder);
1647         FLAC__ASSERT(0 != encoder->private_);
1648         FLAC__ASSERT(0 != encoder->protected_);
1649         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1650                 return false;
1651         encoder->protected_->do_exhaustive_model_search = value;
1652         return true;
1653 }
1654
1655 FLAC_API FLAC__bool FLAC__stream_encoder_set_min_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value)
1656 {
1657         FLAC__ASSERT(0 != encoder);
1658         FLAC__ASSERT(0 != encoder->private_);
1659         FLAC__ASSERT(0 != encoder->protected_);
1660         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1661                 return false;
1662         encoder->protected_->min_residual_partition_order = value;
1663         return true;
1664 }
1665
1666 FLAC_API FLAC__bool FLAC__stream_encoder_set_max_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value)
1667 {
1668         FLAC__ASSERT(0 != encoder);
1669         FLAC__ASSERT(0 != encoder->private_);
1670         FLAC__ASSERT(0 != encoder->protected_);
1671         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1672                 return false;
1673         encoder->protected_->max_residual_partition_order = value;
1674         return true;
1675 }
1676
1677 FLAC_API FLAC__bool FLAC__stream_encoder_set_rice_parameter_search_dist(FLAC__StreamEncoder *encoder, unsigned value)
1678 {
1679         FLAC__ASSERT(0 != encoder);
1680         FLAC__ASSERT(0 != encoder->private_);
1681         FLAC__ASSERT(0 != encoder->protected_);
1682         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1683                 return false;
1684 #if 0
1685         /*@@@ deprecated: */
1686         encoder->protected_->rice_parameter_search_dist = value;
1687 #else
1688         (void)value;
1689 #endif
1690         return true;
1691 }
1692
1693 FLAC_API FLAC__bool FLAC__stream_encoder_set_total_samples_estimate(FLAC__StreamEncoder *encoder, FLAC__uint64 value)
1694 {
1695         FLAC__ASSERT(0 != encoder);
1696         FLAC__ASSERT(0 != encoder->private_);
1697         FLAC__ASSERT(0 != encoder->protected_);
1698         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1699                 return false;
1700         encoder->protected_->total_samples_estimate = value;
1701         return true;
1702 }
1703
1704 FLAC_API FLAC__bool FLAC__stream_encoder_set_metadata(FLAC__StreamEncoder *encoder, FLAC__StreamMetadata **metadata, unsigned num_blocks)
1705 {
1706         FLAC__ASSERT(0 != encoder);
1707         FLAC__ASSERT(0 != encoder->private_);
1708         FLAC__ASSERT(0 != encoder->protected_);
1709         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1710                 return false;
1711         encoder->protected_->metadata = metadata;
1712         encoder->protected_->num_metadata_blocks = num_blocks;
1713 #if FLAC__HAS_OGG
1714         if(!FLAC__ogg_encoder_aspect_set_num_metadata(&encoder->protected_->ogg_encoder_aspect, num_blocks))
1715                 return false;
1716 #endif
1717         return true;
1718 }
1719
1720 /*
1721  * These three functions are not static, but not publically exposed in
1722  * include/FLAC/ either.  They are used by the test suite.
1723  */
1724 FLAC_API FLAC__bool FLAC__stream_encoder_disable_constant_subframes(FLAC__StreamEncoder *encoder, FLAC__bool value)
1725 {
1726         FLAC__ASSERT(0 != encoder);
1727         FLAC__ASSERT(0 != encoder->private_);
1728         FLAC__ASSERT(0 != encoder->protected_);
1729         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1730                 return false;
1731         encoder->private_->disable_constant_subframes = value;
1732         return true;
1733 }
1734
1735 FLAC_API FLAC__bool FLAC__stream_encoder_disable_fixed_subframes(FLAC__StreamEncoder *encoder, FLAC__bool value)
1736 {
1737         FLAC__ASSERT(0 != encoder);
1738         FLAC__ASSERT(0 != encoder->private_);
1739         FLAC__ASSERT(0 != encoder->protected_);
1740         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1741                 return false;
1742         encoder->private_->disable_fixed_subframes = value;
1743         return true;
1744 }
1745
1746 FLAC_API FLAC__bool FLAC__stream_encoder_disable_verbatim_subframes(FLAC__StreamEncoder *encoder, FLAC__bool value)
1747 {
1748         FLAC__ASSERT(0 != encoder);
1749         FLAC__ASSERT(0 != encoder->private_);
1750         FLAC__ASSERT(0 != encoder->protected_);
1751         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1752                 return false;
1753         encoder->private_->disable_verbatim_subframes = value;
1754         return true;
1755 }
1756
1757 FLAC_API FLAC__StreamEncoderState FLAC__stream_encoder_get_state(const FLAC__StreamEncoder *encoder)
1758 {
1759         FLAC__ASSERT(0 != encoder);
1760         FLAC__ASSERT(0 != encoder->private_);
1761         FLAC__ASSERT(0 != encoder->protected_);
1762         return encoder->protected_->state;
1763 }
1764
1765 FLAC_API FLAC__StreamDecoderState FLAC__stream_encoder_get_verify_decoder_state(const FLAC__StreamEncoder *encoder)
1766 {
1767         FLAC__ASSERT(0 != encoder);
1768         FLAC__ASSERT(0 != encoder->private_);
1769         FLAC__ASSERT(0 != encoder->protected_);
1770         if(encoder->protected_->verify)
1771                 return FLAC__stream_decoder_get_state(encoder->private_->verify.decoder);
1772         else
1773                 return FLAC__STREAM_DECODER_UNINITIALIZED;
1774 }
1775
1776 FLAC_API const char *FLAC__stream_encoder_get_resolved_state_string(const FLAC__StreamEncoder *encoder)
1777 {
1778         FLAC__ASSERT(0 != encoder);
1779         FLAC__ASSERT(0 != encoder->private_);
1780         FLAC__ASSERT(0 != encoder->protected_);
1781         if(encoder->protected_->state != FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR)
1782                 return FLAC__StreamEncoderStateString[encoder->protected_->state];
1783         else
1784                 return FLAC__stream_decoder_get_resolved_state_string(encoder->private_->verify.decoder);
1785 }
1786
1787 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)
1788 {
1789         FLAC__ASSERT(0 != encoder);
1790         FLAC__ASSERT(0 != encoder->private_);
1791         FLAC__ASSERT(0 != encoder->protected_);
1792         if(0 != absolute_sample)
1793                 *absolute_sample = encoder->private_->verify.error_stats.absolute_sample;
1794         if(0 != frame_number)
1795                 *frame_number = encoder->private_->verify.error_stats.frame_number;
1796         if(0 != channel)
1797                 *channel = encoder->private_->verify.error_stats.channel;
1798         if(0 != sample)
1799                 *sample = encoder->private_->verify.error_stats.sample;
1800         if(0 != expected)
1801                 *expected = encoder->private_->verify.error_stats.expected;
1802         if(0 != got)
1803                 *got = encoder->private_->verify.error_stats.got;
1804 }
1805
1806 FLAC_API FLAC__bool FLAC__stream_encoder_get_verify(const FLAC__StreamEncoder *encoder)
1807 {
1808         FLAC__ASSERT(0 != encoder);
1809         FLAC__ASSERT(0 != encoder->private_);
1810         FLAC__ASSERT(0 != encoder->protected_);
1811         return encoder->protected_->verify;
1812 }
1813
1814 FLAC_API FLAC__bool FLAC__stream_encoder_get_streamable_subset(const FLAC__StreamEncoder *encoder)
1815 {
1816         FLAC__ASSERT(0 != encoder);
1817         FLAC__ASSERT(0 != encoder->private_);
1818         FLAC__ASSERT(0 != encoder->protected_);
1819         return encoder->protected_->streamable_subset;
1820 }
1821
1822 FLAC_API unsigned FLAC__stream_encoder_get_channels(const FLAC__StreamEncoder *encoder)
1823 {
1824         FLAC__ASSERT(0 != encoder);
1825         FLAC__ASSERT(0 != encoder->private_);
1826         FLAC__ASSERT(0 != encoder->protected_);
1827         return encoder->protected_->channels;
1828 }
1829
1830 FLAC_API unsigned FLAC__stream_encoder_get_bits_per_sample(const FLAC__StreamEncoder *encoder)
1831 {
1832         FLAC__ASSERT(0 != encoder);
1833         FLAC__ASSERT(0 != encoder->private_);
1834         FLAC__ASSERT(0 != encoder->protected_);
1835         return encoder->protected_->bits_per_sample;
1836 }
1837
1838 FLAC_API unsigned FLAC__stream_encoder_get_sample_rate(const FLAC__StreamEncoder *encoder)
1839 {
1840         FLAC__ASSERT(0 != encoder);
1841         FLAC__ASSERT(0 != encoder->private_);
1842         FLAC__ASSERT(0 != encoder->protected_);
1843         return encoder->protected_->sample_rate;
1844 }
1845
1846 FLAC_API unsigned FLAC__stream_encoder_get_blocksize(const FLAC__StreamEncoder *encoder)
1847 {
1848         FLAC__ASSERT(0 != encoder);
1849         FLAC__ASSERT(0 != encoder->private_);
1850         FLAC__ASSERT(0 != encoder->protected_);
1851         return encoder->protected_->blocksize;
1852 }
1853
1854 FLAC_API FLAC__bool FLAC__stream_encoder_get_do_mid_side_stereo(const FLAC__StreamEncoder *encoder)
1855 {
1856         FLAC__ASSERT(0 != encoder);
1857         FLAC__ASSERT(0 != encoder->private_);
1858         FLAC__ASSERT(0 != encoder->protected_);
1859         return encoder->protected_->do_mid_side_stereo;
1860 }
1861
1862 FLAC_API FLAC__bool FLAC__stream_encoder_get_loose_mid_side_stereo(const FLAC__StreamEncoder *encoder)
1863 {
1864         FLAC__ASSERT(0 != encoder);
1865         FLAC__ASSERT(0 != encoder->private_);
1866         FLAC__ASSERT(0 != encoder->protected_);
1867         return encoder->protected_->loose_mid_side_stereo;
1868 }
1869
1870 FLAC_API unsigned FLAC__stream_encoder_get_max_lpc_order(const FLAC__StreamEncoder *encoder)
1871 {
1872         FLAC__ASSERT(0 != encoder);
1873         FLAC__ASSERT(0 != encoder->private_);
1874         FLAC__ASSERT(0 != encoder->protected_);
1875         return encoder->protected_->max_lpc_order;
1876 }
1877
1878 FLAC_API unsigned FLAC__stream_encoder_get_qlp_coeff_precision(const FLAC__StreamEncoder *encoder)
1879 {
1880         FLAC__ASSERT(0 != encoder);
1881         FLAC__ASSERT(0 != encoder->private_);
1882         FLAC__ASSERT(0 != encoder->protected_);
1883         return encoder->protected_->qlp_coeff_precision;
1884 }
1885
1886 FLAC_API FLAC__bool FLAC__stream_encoder_get_do_qlp_coeff_prec_search(const FLAC__StreamEncoder *encoder)
1887 {
1888         FLAC__ASSERT(0 != encoder);
1889         FLAC__ASSERT(0 != encoder->private_);
1890         FLAC__ASSERT(0 != encoder->protected_);
1891         return encoder->protected_->do_qlp_coeff_prec_search;
1892 }
1893
1894 FLAC_API FLAC__bool FLAC__stream_encoder_get_do_escape_coding(const FLAC__StreamEncoder *encoder)
1895 {
1896         FLAC__ASSERT(0 != encoder);
1897         FLAC__ASSERT(0 != encoder->private_);
1898         FLAC__ASSERT(0 != encoder->protected_);
1899         return encoder->protected_->do_escape_coding;
1900 }
1901
1902 FLAC_API FLAC__bool FLAC__stream_encoder_get_do_exhaustive_model_search(const FLAC__StreamEncoder *encoder)
1903 {
1904         FLAC__ASSERT(0 != encoder);
1905         FLAC__ASSERT(0 != encoder->private_);
1906         FLAC__ASSERT(0 != encoder->protected_);
1907         return encoder->protected_->do_exhaustive_model_search;
1908 }
1909
1910 FLAC_API unsigned FLAC__stream_encoder_get_min_residual_partition_order(const FLAC__StreamEncoder *encoder)
1911 {
1912         FLAC__ASSERT(0 != encoder);
1913         FLAC__ASSERT(0 != encoder->private_);
1914         FLAC__ASSERT(0 != encoder->protected_);
1915         return encoder->protected_->min_residual_partition_order;
1916 }
1917
1918 FLAC_API unsigned FLAC__stream_encoder_get_max_residual_partition_order(const FLAC__StreamEncoder *encoder)
1919 {
1920         FLAC__ASSERT(0 != encoder);
1921         FLAC__ASSERT(0 != encoder->private_);
1922         FLAC__ASSERT(0 != encoder->protected_);
1923         return encoder->protected_->max_residual_partition_order;
1924 }
1925
1926 FLAC_API unsigned FLAC__stream_encoder_get_rice_parameter_search_dist(const FLAC__StreamEncoder *encoder)
1927 {
1928         FLAC__ASSERT(0 != encoder);
1929         FLAC__ASSERT(0 != encoder->private_);
1930         FLAC__ASSERT(0 != encoder->protected_);
1931         return encoder->protected_->rice_parameter_search_dist;
1932 }
1933
1934 FLAC_API FLAC__uint64 FLAC__stream_encoder_get_total_samples_estimate(const FLAC__StreamEncoder *encoder)
1935 {
1936         FLAC__ASSERT(0 != encoder);
1937         FLAC__ASSERT(0 != encoder->private_);
1938         FLAC__ASSERT(0 != encoder->protected_);
1939         return encoder->protected_->total_samples_estimate;
1940 }
1941
1942 FLAC_API FLAC__bool FLAC__stream_encoder_process(FLAC__StreamEncoder *encoder, const FLAC__int32 * const buffer[], unsigned samples)
1943 {
1944         unsigned i, j, channel;
1945         FLAC__int32 x, mid, side;
1946         const unsigned channels = encoder->protected_->channels, blocksize = encoder->protected_->blocksize;
1947
1948         FLAC__ASSERT(0 != encoder);
1949         FLAC__ASSERT(0 != encoder->private_);
1950         FLAC__ASSERT(0 != encoder->protected_);
1951         FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
1952
1953         j = 0;
1954         /*
1955          * we have several flavors of the same basic loop, optimized for
1956          * different conditions:
1957          */
1958         if(encoder->protected_->max_lpc_order > 0) {
1959                 if(encoder->protected_->do_mid_side_stereo && channels == 2) {
1960                         /*
1961                          * stereo coding: unroll channel loop
1962                          * with LPC: calculate floating point version of signal
1963                          */
1964                         do {
1965                                 if(encoder->protected_->verify)
1966                                         append_to_verify_fifo_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize+1-encoder->private_->current_sample_number, samples-j));
1967
1968                                 /* "i <= blocksize" to overread 1 sample; see comment in OVERREAD_ decl */
1969                                 for(i = encoder->private_->current_sample_number; i <= blocksize && j < samples; i++, j++) {
1970                                         x = mid = side = buffer[0][j];
1971                                         encoder->private_->integer_signal[0][i] = x;
1972 #ifndef FLAC__INTEGER_ONLY_LIBRARY
1973                                         encoder->private_->real_signal[0][i] = (FLAC__real)x;
1974 #endif
1975                                         x = buffer[1][j];
1976                                         encoder->private_->integer_signal[1][i] = x;
1977 #ifndef FLAC__INTEGER_ONLY_LIBRARY
1978                                         encoder->private_->real_signal[1][i] = (FLAC__real)x;
1979 #endif
1980                                         mid += x;
1981                                         side -= x;
1982                                         mid >>= 1; /* NOTE: not the same as 'mid = (buffer[0][j] + buffer[1][j]) / 2' ! */
1983                                         encoder->private_->integer_signal_mid_side[1][i] = side;
1984                                         encoder->private_->integer_signal_mid_side[0][i] = mid;
1985 #ifndef FLAC__INTEGER_ONLY_LIBRARY
1986                                         encoder->private_->real_signal_mid_side[1][i] = (FLAC__real)side;
1987                                         encoder->private_->real_signal_mid_side[0][i] = (FLAC__real)mid;
1988 #endif
1989                                         encoder->private_->current_sample_number++;
1990                                 }
1991                                 /* we only process if we have a full block + 1 extra sample; final block is always handled by FLAC__stream_encoder_finish() */
1992                                 if(i > blocksize) {
1993                                         if(!process_frame_(encoder, /*is_fractional_block=*/false, /*is_last_block=*/false))
1994                                                 return false;
1995                                         /* move unprocessed overread samples to beginnings of arrays */
1996                                         FLAC__ASSERT(i == blocksize+OVERREAD_);
1997                                         FLAC__ASSERT(OVERREAD_ == 1); /* assert we only overread 1 sample which simplifies the rest of the code below */
1998                                         i--;
1999                                         encoder->private_->integer_signal[0][0] = encoder->private_->integer_signal[0][i];
2000                                         encoder->private_->integer_signal[1][0] = encoder->private_->integer_signal[1][i];
2001                                         encoder->private_->integer_signal_mid_side[0][0] = encoder->private_->integer_signal_mid_side[0][i];
2002                                         encoder->private_->integer_signal_mid_side[1][0] = encoder->private_->integer_signal_mid_side[1][i];
2003 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2004                                         encoder->private_->real_signal[0][0] = encoder->private_->real_signal[0][i];
2005                                         encoder->private_->real_signal[1][0] = encoder->private_->real_signal[1][i];
2006                                         encoder->private_->real_signal_mid_side[0][0] = encoder->private_->real_signal_mid_side[0][i];
2007                                         encoder->private_->real_signal_mid_side[1][0] = encoder->private_->real_signal_mid_side[1][i];
2008 #endif
2009                                         encoder->private_->current_sample_number = 1;
2010                                 }
2011                         } while(j < samples);
2012                 }
2013                 else {
2014                         /*
2015                          * independent channel coding: buffer each channel in inner loop
2016                          * with LPC: calculate floating point version of signal
2017                          */
2018                         do {
2019                                 if(encoder->protected_->verify)
2020                                         append_to_verify_fifo_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize+1-encoder->private_->current_sample_number, samples-j));
2021
2022                                 /* "i <= blocksize" to overread 1 sample; see comment in OVERREAD_ decl */
2023                                 for(i = encoder->private_->current_sample_number; i <= blocksize && j < samples; i++, j++) {
2024                                         for(channel = 0; channel < channels; channel++) {
2025                                                 x = buffer[channel][j];
2026                                                 encoder->private_->integer_signal[channel][i] = x;
2027 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2028                                                 encoder->private_->real_signal[channel][i] = (FLAC__real)x;
2029 #endif
2030                                         }
2031                                         encoder->private_->current_sample_number++;
2032                                 }
2033                                 /* we only process if we have a full block + 1 extra sample; final block is always handled by FLAC__stream_encoder_finish() */
2034                                 if(i > blocksize) {
2035                                         if(!process_frame_(encoder, /*is_fractional_block=*/false, /*is_last_block=*/false))
2036                                                 return false;
2037                                         /* move unprocessed overread samples to beginnings of arrays */
2038                                         FLAC__ASSERT(i == blocksize+OVERREAD_);
2039                                         FLAC__ASSERT(OVERREAD_ == 1); /* assert we only overread 1 sample which simplifies the rest of the code below */
2040                                         i--;
2041                                         for(channel = 0; channel < channels; channel++) {
2042                                                 encoder->private_->integer_signal[channel][0] = encoder->private_->integer_signal[channel][i];
2043 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2044                                                 encoder->private_->real_signal[channel][0] = encoder->private_->real_signal[channel][i];
2045 #endif
2046                                         }
2047                                         encoder->private_->current_sample_number = 1;
2048                                 }
2049                         } while(j < samples);
2050                 }
2051         }
2052         else {
2053                 if(encoder->protected_->do_mid_side_stereo && channels == 2) {
2054                         /*
2055                          * stereo coding: unroll channel loop
2056                          * without LPC: no need to calculate floating point version of signal
2057                          */
2058                         do {
2059                                 if(encoder->protected_->verify)
2060                                         append_to_verify_fifo_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize+1-encoder->private_->current_sample_number, samples-j));
2061
2062                                 /* "i <= blocksize" to overread 1 sample; see comment in OVERREAD_ decl */
2063                                 for(i = encoder->private_->current_sample_number; i <= blocksize && j < samples; i++, j++) {
2064                                         encoder->private_->integer_signal[0][i] = mid = side = buffer[0][j];
2065                                         x = buffer[1][j];
2066                                         encoder->private_->integer_signal[1][i] = x;
2067                                         mid += x;
2068                                         side -= x;
2069                                         mid >>= 1; /* NOTE: not the same as 'mid = (buffer[0][j] + buffer[1][j]) / 2' ! */
2070                                         encoder->private_->integer_signal_mid_side[1][i] = side;
2071                                         encoder->private_->integer_signal_mid_side[0][i] = mid;
2072                                         encoder->private_->current_sample_number++;
2073                                 }
2074                                 /* we only process if we have a full block + 1 extra sample; final block is always handled by FLAC__stream_encoder_finish() */
2075                                 if(i > blocksize) {
2076                                         if(!process_frame_(encoder, /*is_fractional_block=*/false, /*is_last_block=*/false))
2077                                                 return false;
2078                                         /* move unprocessed overread samples to beginnings of arrays */
2079                                         FLAC__ASSERT(i == blocksize+OVERREAD_);
2080                                         FLAC__ASSERT(OVERREAD_ == 1); /* assert we only overread 1 sample which simplifies the rest of the code below */
2081                                         i--;
2082                                         encoder->private_->integer_signal[0][0] = encoder->private_->integer_signal[0][i];
2083                                         encoder->private_->integer_signal[1][0] = encoder->private_->integer_signal[1][i];
2084                                         encoder->private_->integer_signal_mid_side[0][0] = encoder->private_->integer_signal_mid_side[0][i];
2085                                         encoder->private_->integer_signal_mid_side[1][0] = encoder->private_->integer_signal_mid_side[1][i];
2086                                         encoder->private_->current_sample_number = 1;
2087                                 }
2088                         } while(j < samples);
2089                 }
2090                 else {
2091                         /*
2092                          * independent channel coding: buffer each channel in inner loop
2093                          * without LPC: no need to calculate floating point version of signal
2094                          */
2095                         do {
2096                                 if(encoder->protected_->verify)
2097                                         append_to_verify_fifo_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize+1-encoder->private_->current_sample_number, samples-j));
2098
2099                                 /* "i <= blocksize" to overread 1 sample; see comment in OVERREAD_ decl */
2100                                 for(i = encoder->private_->current_sample_number; i <= blocksize && j < samples; i++, j++) {
2101                                         for(channel = 0; channel < channels; channel++)
2102                                                 encoder->private_->integer_signal[channel][i] = buffer[channel][j];
2103                                         encoder->private_->current_sample_number++;
2104                                 }
2105                                 /* we only process if we have a full block + 1 extra sample; final block is always handled by FLAC__stream_encoder_finish() */
2106                                 if(i > blocksize) {
2107                                         if(!process_frame_(encoder, /*is_fractional_block=*/false, /*is_last_block=*/false))
2108                                                 return false;
2109                                         /* move unprocessed overread samples to beginnings of arrays */
2110                                         FLAC__ASSERT(i == blocksize+OVERREAD_);
2111                                         FLAC__ASSERT(OVERREAD_ == 1); /* assert we only overread 1 sample which simplifies the rest of the code below */
2112                                         i--;
2113                                         for(channel = 0; channel < channels; channel++)
2114                                                 encoder->private_->integer_signal[channel][0] = encoder->private_->integer_signal[channel][i];
2115                                         encoder->private_->current_sample_number = 1;
2116                                 }
2117                         } while(j < samples);
2118                 }
2119         }
2120
2121         return true;
2122 }
2123
2124 FLAC_API FLAC__bool FLAC__stream_encoder_process_interleaved(FLAC__StreamEncoder *encoder, const FLAC__int32 buffer[], unsigned samples)
2125 {
2126         unsigned i, j, k, channel;
2127         FLAC__int32 x, mid, side;
2128         const unsigned channels = encoder->protected_->channels, blocksize = encoder->protected_->blocksize;
2129
2130         FLAC__ASSERT(0 != encoder);
2131         FLAC__ASSERT(0 != encoder->private_);
2132         FLAC__ASSERT(0 != encoder->protected_);
2133         FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
2134
2135         j = k = 0;
2136         /*
2137          * we have several flavors of the same basic loop, optimized for
2138          * different conditions:
2139          */
2140         if(encoder->protected_->max_lpc_order > 0) {
2141                 if(encoder->protected_->do_mid_side_stereo && channels == 2) {
2142                         /*
2143                          * stereo coding: unroll channel loop
2144                          * with LPC: calculate floating point version of signal
2145                          */
2146                         do {
2147                                 if(encoder->protected_->verify)
2148                                         append_to_verify_fifo_interleaved_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize+1-encoder->private_->current_sample_number, samples-j));
2149
2150                                 /* "i <= blocksize" to overread 1 sample; see comment in OVERREAD_ decl */
2151                                 for(i = encoder->private_->current_sample_number; i <= blocksize && j < samples; i++, j++) {
2152                                         x = mid = side = buffer[k++];
2153                                         encoder->private_->integer_signal[0][i] = x;
2154 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2155                                         encoder->private_->real_signal[0][i] = (FLAC__real)x;
2156 #endif
2157                                         x = buffer[k++];
2158                                         encoder->private_->integer_signal[1][i] = x;
2159 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2160                                         encoder->private_->real_signal[1][i] = (FLAC__real)x;
2161 #endif
2162                                         mid += x;
2163                                         side -= x;
2164                                         mid >>= 1; /* NOTE: not the same as 'mid = (left + right) / 2' ! */
2165                                         encoder->private_->integer_signal_mid_side[1][i] = side;
2166                                         encoder->private_->integer_signal_mid_side[0][i] = mid;
2167 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2168                                         encoder->private_->real_signal_mid_side[1][i] = (FLAC__real)side;
2169                                         encoder->private_->real_signal_mid_side[0][i] = (FLAC__real)mid;
2170 #endif
2171                                         encoder->private_->current_sample_number++;
2172                                 }
2173                                 /* we only process if we have a full block + 1 extra sample; final block is always handled by FLAC__stream_encoder_finish() */
2174                                 if(i > blocksize) {
2175                                         if(!process_frame_(encoder, /*is_fractional_block=*/false, /*is_last_block=*/false))
2176                                                 return false;
2177                                         /* move unprocessed overread samples to beginnings of arrays */
2178                                         FLAC__ASSERT(i == blocksize+OVERREAD_);
2179                                         FLAC__ASSERT(OVERREAD_ == 1); /* assert we only overread 1 sample which simplifies the rest of the code below */
2180                                         i--;
2181                                         encoder->private_->integer_signal[0][0] = encoder->private_->integer_signal[0][i];
2182                                         encoder->private_->integer_signal[1][0] = encoder->private_->integer_signal[1][i];
2183                                         encoder->private_->integer_signal_mid_side[0][0] = encoder->private_->integer_signal_mid_side[0][i];
2184                                         encoder->private_->integer_signal_mid_side[1][0] = encoder->private_->integer_signal_mid_side[1][i];
2185 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2186                                         encoder->private_->real_signal[0][0] = encoder->private_->real_signal[0][i];
2187                                         encoder->private_->real_signal[1][0] = encoder->private_->real_signal[1][i];
2188                                         encoder->private_->real_signal_mid_side[0][0] = encoder->private_->real_signal_mid_side[0][i];
2189                                         encoder->private_->real_signal_mid_side[1][0] = encoder->private_->real_signal_mid_side[1][i];
2190 #endif
2191                                         encoder->private_->current_sample_number = 1;
2192                                 }
2193                         } while(j < samples);
2194                 }
2195                 else {
2196                         /*
2197                          * independent channel coding: buffer each channel in inner loop
2198                          * with LPC: calculate floating point version of signal
2199                          */
2200                         do {
2201                                 if(encoder->protected_->verify)
2202                                         append_to_verify_fifo_interleaved_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize+1-encoder->private_->current_sample_number, samples-j));
2203
2204                                 /* "i <= blocksize" to overread 1 sample; see comment in OVERREAD_ decl */
2205                                 for(i = encoder->private_->current_sample_number; i <= blocksize && j < samples; i++, j++) {
2206                                         for(channel = 0; channel < channels; channel++) {
2207                                                 x = buffer[k++];
2208                                                 encoder->private_->integer_signal[channel][i] = x;
2209 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2210                                                 encoder->private_->real_signal[channel][i] = (FLAC__real)x;
2211 #endif
2212                                         }
2213                                         encoder->private_->current_sample_number++;
2214                                 }
2215                                 /* we only process if we have a full block + 1 extra sample; final block is always handled by FLAC__stream_encoder_finish() */
2216                                 if(i > blocksize) {
2217                                         if(!process_frame_(encoder, /*is_fractional_block=*/false, /*is_last_block=*/false))
2218                                                 return false;
2219                                         /* move unprocessed overread samples to beginnings of arrays */
2220                                         FLAC__ASSERT(i == blocksize+OVERREAD_);
2221                                         FLAC__ASSERT(OVERREAD_ == 1); /* assert we only overread 1 sample which simplifies the rest of the code below */
2222                                         i--;
2223                                         for(channel = 0; channel < channels; channel++) {
2224                                                 encoder->private_->integer_signal[channel][0] = encoder->private_->integer_signal[channel][i];
2225 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2226                                                 encoder->private_->real_signal[channel][0] = encoder->private_->real_signal[channel][i];
2227 #endif
2228                                         }
2229                                         encoder->private_->current_sample_number = 1;
2230                                 }
2231                         } while(j < samples);
2232                 }
2233         }
2234         else {
2235                 if(encoder->protected_->do_mid_side_stereo && channels == 2) {
2236                         /*
2237                          * stereo coding: unroll channel loop
2238                          * without LPC: no need to calculate floating point version of signal
2239                          */
2240                         do {
2241                                 if(encoder->protected_->verify)
2242                                         append_to_verify_fifo_interleaved_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize+1-encoder->private_->current_sample_number, samples-j));
2243
2244                                 /* "i <= blocksize" to overread 1 sample; see comment in OVERREAD_ decl */
2245                                 for(i = encoder->private_->current_sample_number; i <= blocksize && j < samples; i++, j++) {
2246                                         encoder->private_->integer_signal[0][i] = mid = side = buffer[k++];
2247                                         x = buffer[k++];
2248                                         encoder->private_->integer_signal[1][i] = x;
2249                                         mid += x;
2250                                         side -= x;
2251                                         mid >>= 1; /* NOTE: not the same as 'mid = (left + right) / 2' ! */
2252                                         encoder->private_->integer_signal_mid_side[1][i] = side;
2253                                         encoder->private_->integer_signal_mid_side[0][i] = mid;
2254                                         encoder->private_->current_sample_number++;
2255                                 }
2256                                 /* we only process if we have a full block + 1 extra sample; final block is always handled by FLAC__stream_encoder_finish() */
2257                                 if(i > blocksize) {
2258                                         if(!process_frame_(encoder, /*is_fractional_block=*/false, /*is_last_block=*/false))
2259                                                 return false;
2260                                         /* move unprocessed overread samples to beginnings of arrays */
2261                                         FLAC__ASSERT(i == blocksize+OVERREAD_);
2262                                         FLAC__ASSERT(OVERREAD_ == 1); /* assert we only overread 1 sample which simplifies the rest of the code below */
2263                                         i--;
2264                                         encoder->private_->integer_signal[0][0] = encoder->private_->integer_signal[0][i];
2265                                         encoder->private_->integer_signal[1][0] = encoder->private_->integer_signal[1][i];
2266                                         encoder->private_->integer_signal_mid_side[0][0] = encoder->private_->integer_signal_mid_side[0][i];
2267                                         encoder->private_->integer_signal_mid_side[1][0] = encoder->private_->integer_signal_mid_side[1][i];
2268                                         encoder->private_->current_sample_number = 1;
2269                                 }
2270                         } while(j < samples);
2271                 }
2272                 else {
2273                         /*
2274                          * independent channel coding: buffer each channel in inner loop
2275                          * without LPC: no need to calculate floating point version of signal
2276                          */
2277                         do {
2278                                 if(encoder->protected_->verify)
2279                                         append_to_verify_fifo_interleaved_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize+1-encoder->private_->current_sample_number, samples-j));
2280
2281                                 /* "i <= blocksize" to overread 1 sample; see comment in OVERREAD_ decl */
2282                                 for(i = encoder->private_->current_sample_number; i <= blocksize && j < samples; i++, j++) {
2283                                         for(channel = 0; channel < channels; channel++)
2284                                                 encoder->private_->integer_signal[channel][i] = buffer[k++];
2285                                         encoder->private_->current_sample_number++;
2286                                 }
2287                                 /* we only process if we have a full block + 1 extra sample; final block is always handled by FLAC__stream_encoder_finish() */
2288                                 if(i > blocksize) {
2289                                         if(!process_frame_(encoder, /*is_fractional_block=*/false, /*is_last_block=*/false))
2290                                                 return false;
2291                                         /* move unprocessed overread samples to beginnings of arrays */
2292                                         FLAC__ASSERT(i == blocksize+OVERREAD_);
2293                                         FLAC__ASSERT(OVERREAD_ == 1); /* assert we only overread 1 sample which simplifies the rest of the code below */
2294                                         i--;
2295                                         for(channel = 0; channel < channels; channel++)
2296                                                 encoder->private_->integer_signal[channel][0] = encoder->private_->integer_signal[channel][i];
2297                                         encoder->private_->current_sample_number = 1;
2298                                 }
2299                         } while(j < samples);
2300                 }
2301         }
2302
2303         return true;
2304 }
2305
2306 /***********************************************************************
2307  *
2308  * Private class methods
2309  *
2310  ***********************************************************************/
2311
2312 void set_defaults_(FLAC__StreamEncoder *encoder)
2313 {
2314         FLAC__ASSERT(0 != encoder);
2315
2316 #ifdef FLAC__MANDATORY_VERIFY_WHILE_ENCODING
2317         encoder->protected_->verify = true;
2318 #else
2319         encoder->protected_->verify = false;
2320 #endif
2321         encoder->protected_->streamable_subset = true;
2322         encoder->protected_->do_mid_side_stereo = false;
2323         encoder->protected_->loose_mid_side_stereo = false;
2324         encoder->protected_->channels = 2;
2325         encoder->protected_->bits_per_sample = 16;
2326         encoder->protected_->sample_rate = 44100;
2327         encoder->protected_->blocksize = 0;
2328 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2329         encoder->protected_->num_apodizations = 1;
2330         encoder->protected_->apodizations[0].type = FLAC__APODIZATION_TUKEY;
2331         encoder->protected_->apodizations[0].parameters.tukey.p = 0.5;
2332 #endif
2333         encoder->protected_->max_lpc_order = 0;
2334         encoder->protected_->qlp_coeff_precision = 0;
2335         encoder->protected_->do_qlp_coeff_prec_search = false;
2336         encoder->protected_->do_exhaustive_model_search = false;
2337         encoder->protected_->do_escape_coding = false;
2338         encoder->protected_->min_residual_partition_order = 0;
2339         encoder->protected_->max_residual_partition_order = 0;
2340         encoder->protected_->rice_parameter_search_dist = 0;
2341         encoder->protected_->total_samples_estimate = 0;
2342         encoder->protected_->metadata = 0;
2343         encoder->protected_->num_metadata_blocks = 0;
2344
2345         encoder->private_->seek_table = 0;
2346         encoder->private_->disable_constant_subframes = false;
2347         encoder->private_->disable_fixed_subframes = false;
2348         encoder->private_->disable_verbatim_subframes = false;
2349 #if FLAC__HAS_OGG
2350         encoder->private_->is_ogg = false;
2351 #endif
2352         encoder->private_->read_callback = 0;
2353         encoder->private_->write_callback = 0;
2354         encoder->private_->seek_callback = 0;
2355         encoder->private_->tell_callback = 0;
2356         encoder->private_->metadata_callback = 0;
2357         encoder->private_->progress_callback = 0;
2358         encoder->private_->client_data = 0;
2359
2360 #if FLAC__HAS_OGG
2361         FLAC__ogg_encoder_aspect_set_defaults(&encoder->protected_->ogg_encoder_aspect);
2362 #endif
2363 }
2364
2365 void free_(FLAC__StreamEncoder *encoder)
2366 {
2367         unsigned i, channel;
2368
2369         FLAC__ASSERT(0 != encoder);
2370         for(i = 0; i < encoder->protected_->channels; i++) {
2371                 if(0 != encoder->private_->integer_signal_unaligned[i]) {
2372                         free(encoder->private_->integer_signal_unaligned[i]);
2373                         encoder->private_->integer_signal_unaligned[i] = 0;
2374                 }
2375 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2376                 if(0 != encoder->private_->real_signal_unaligned[i]) {
2377                         free(encoder->private_->real_signal_unaligned[i]);
2378                         encoder->private_->real_signal_unaligned[i] = 0;
2379                 }
2380 #endif
2381         }
2382         for(i = 0; i < 2; i++) {
2383                 if(0 != encoder->private_->integer_signal_mid_side_unaligned[i]) {
2384                         free(encoder->private_->integer_signal_mid_side_unaligned[i]);
2385                         encoder->private_->integer_signal_mid_side_unaligned[i] = 0;
2386                 }
2387 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2388                 if(0 != encoder->private_->real_signal_mid_side_unaligned[i]) {
2389                         free(encoder->private_->real_signal_mid_side_unaligned[i]);
2390                         encoder->private_->real_signal_mid_side_unaligned[i] = 0;
2391                 }
2392 #endif
2393         }
2394 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2395         for(i = 0; i < encoder->protected_->num_apodizations; i++) {
2396                 if(0 != encoder->private_->window_unaligned[i]) {
2397                         free(encoder->private_->window_unaligned[i]);
2398                         encoder->private_->window_unaligned[i] = 0;
2399                 }
2400         }
2401         if(0 != encoder->private_->windowed_signal_unaligned) {
2402                 free(encoder->private_->windowed_signal_unaligned);
2403                 encoder->private_->windowed_signal_unaligned = 0;
2404         }
2405 #endif
2406         for(channel = 0; channel < encoder->protected_->channels; channel++) {
2407                 for(i = 0; i < 2; i++) {
2408                         if(0 != encoder->private_->residual_workspace_unaligned[channel][i]) {
2409                                 free(encoder->private_->residual_workspace_unaligned[channel][i]);
2410                                 encoder->private_->residual_workspace_unaligned[channel][i] = 0;
2411                         }
2412                 }
2413         }
2414         for(channel = 0; channel < 2; channel++) {
2415                 for(i = 0; i < 2; i++) {
2416                         if(0 != encoder->private_->residual_workspace_mid_side_unaligned[channel][i]) {
2417                                 free(encoder->private_->residual_workspace_mid_side_unaligned[channel][i]);
2418                                 encoder->private_->residual_workspace_mid_side_unaligned[channel][i] = 0;
2419                         }
2420                 }
2421         }
2422         if(0 != encoder->private_->abs_residual_partition_sums_unaligned) {
2423                 free(encoder->private_->abs_residual_partition_sums_unaligned);
2424                 encoder->private_->abs_residual_partition_sums_unaligned = 0;
2425         }
2426         if(0 != encoder->private_->raw_bits_per_partition_unaligned) {
2427                 free(encoder->private_->raw_bits_per_partition_unaligned);
2428                 encoder->private_->raw_bits_per_partition_unaligned = 0;
2429         }
2430         if(encoder->protected_->verify) {
2431                 for(i = 0; i < encoder->protected_->channels; i++) {
2432                         if(0 != encoder->private_->verify.input_fifo.data[i]) {
2433                                 free(encoder->private_->verify.input_fifo.data[i]);
2434                                 encoder->private_->verify.input_fifo.data[i] = 0;
2435                         }
2436                 }
2437         }
2438         FLAC__bitwriter_free(encoder->private_->frame);
2439 }
2440
2441 FLAC__bool resize_buffers_(FLAC__StreamEncoder *encoder, unsigned new_blocksize)
2442 {
2443         FLAC__bool ok;
2444         unsigned i, channel;
2445
2446         FLAC__ASSERT(new_blocksize > 0);
2447         FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
2448         FLAC__ASSERT(encoder->private_->current_sample_number == 0);
2449
2450         /* To avoid excessive malloc'ing, we only grow the buffer; no shrinking. */
2451         if(new_blocksize <= encoder->private_->input_capacity)
2452                 return true;
2453
2454         ok = true;
2455
2456         /* WATCHOUT: FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32_mmx()
2457          * requires that the input arrays (in our case the integer signals)
2458          * have a buffer of up to 3 zeroes in front (at negative indices) for
2459          * alignment purposes; we use 4 in front to keep the data well-aligned.
2460          */
2461
2462         for(i = 0; ok && i < encoder->protected_->channels; i++) {
2463                 ok = ok && FLAC__memory_alloc_aligned_int32_array(new_blocksize+4+OVERREAD_, &encoder->private_->integer_signal_unaligned[i], &encoder->private_->integer_signal[i]);
2464                 memset(encoder->private_->integer_signal[i], 0, sizeof(FLAC__int32)*4);
2465                 encoder->private_->integer_signal[i] += 4;
2466 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2467                 if(encoder->protected_->max_lpc_order > 0)
2468                         ok = ok && FLAC__memory_alloc_aligned_real_array(new_blocksize+OVERREAD_, &encoder->private_->real_signal_unaligned[i], &encoder->private_->real_signal[i]);
2469 #endif
2470         }
2471         for(i = 0; ok && i < 2; i++) {
2472                 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]);
2473                 memset(encoder->private_->integer_signal_mid_side[i], 0, sizeof(FLAC__int32)*4);
2474                 encoder->private_->integer_signal_mid_side[i] += 4;
2475 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2476                 if(encoder->protected_->max_lpc_order > 0)
2477                         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]);
2478 #endif
2479         }
2480 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2481         if(ok && encoder->protected_->max_lpc_order > 0) {
2482                 for(i = 0; ok && i < encoder->protected_->num_apodizations; i++)
2483                         ok = ok && FLAC__memory_alloc_aligned_real_array(new_blocksize, &encoder->private_->window_unaligned[i], &encoder->private_->window[i]);
2484                 ok = ok && FLAC__memory_alloc_aligned_real_array(new_blocksize, &encoder->private_->windowed_signal_unaligned, &encoder->private_->windowed_signal);
2485         }
2486 #endif
2487         for(channel = 0; ok && channel < encoder->protected_->channels; channel++) {
2488                 for(i = 0; ok && i < 2; i++) {
2489                         ok = ok && FLAC__memory_alloc_aligned_int32_array(new_blocksize, &encoder->private_->residual_workspace_unaligned[channel][i], &encoder->private_->residual_workspace[channel][i]);
2490                 }
2491         }
2492         for(channel = 0; ok && channel < 2; channel++) {
2493                 for(i = 0; ok && i < 2; i++) {
2494                         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]);
2495                 }
2496         }
2497         /* @@@@@@@@@ blocksize*2 is too pessimistic, but to fix, we need smarter logic because a smaller new_blocksize can actually increase the # of partitions */
2498         ok = ok && FLAC__memory_alloc_aligned_uint64_array(new_blocksize * 2, &encoder->private_->abs_residual_partition_sums_unaligned, &encoder->private_->abs_residual_partition_sums);
2499         if(encoder->protected_->do_escape_coding)
2500                 ok = ok && FLAC__memory_alloc_aligned_unsigned_array(new_blocksize * 2, &encoder->private_->raw_bits_per_partition_unaligned, &encoder->private_->raw_bits_per_partition);
2501
2502         /* now adjust the windows if the blocksize has changed */
2503 #ifndef FLAC__INTEGER_ONLY_LIBRARY
2504         if(ok && new_blocksize != encoder->private_->input_capacity && encoder->protected_->max_lpc_order > 0) {
2505                 for(i = 0; ok && i < encoder->protected_->num_apodizations; i++) {
2506                         switch(encoder->protected_->apodizations[i].type) {
2507                                 case FLAC__APODIZATION_BARTLETT:
2508                                         FLAC__window_bartlett(encoder->private_->window[i], new_blocksize);
2509                                         break;
2510                                 case FLAC__APODIZATION_BARTLETT_HANN:
2511                                         FLAC__window_bartlett_hann(encoder->private_->window[i], new_blocksize);
2512                                         break;
2513                                 case FLAC__APODIZATION_BLACKMAN:
2514                                         FLAC__window_blackman(encoder->private_->window[i], new_blocksize);
2515                                         break;
2516                                 case FLAC__APODIZATION_BLACKMAN_HARRIS_4TERM_92DB_SIDELOBE:
2517                                         FLAC__window_blackman_harris_4term_92db_sidelobe(encoder->private_->window[i], new_blocksize);
2518                                         break;
2519                                 case FLAC__APODIZATION_CONNES:
2520                                         FLAC__window_connes(encoder->private_->window[i], new_blocksize);
2521                                         break;
2522                                 case FLAC__APODIZATION_FLATTOP:
2523                                         FLAC__window_flattop(encoder->private_->window[i], new_blocksize);
2524                                         break;
2525                                 case FLAC__APODIZATION_GAUSS:
2526                                         FLAC__window_gauss(encoder->private_->window[i], new_blocksize, encoder->protected_->apodizations[i].parameters.gauss.stddev);
2527                                         break;
2528                                 case FLAC__APODIZATION_HAMMING:
2529                                         FLAC__window_hamming(encoder->private_->window[i], new_blocksize);
2530                                         break;
2531                                 case FLAC__APODIZATION_HANN:
2532                                         FLAC__window_hann(encoder->private_->window[i], new_blocksize);
2533                                         break;
2534                                 case FLAC__APODIZATION_KAISER_BESSEL:
2535                                         FLAC__window_kaiser_bessel(encoder->private_->window[i], new_blocksize);
2536                                         break;
2537                                 case FLAC__APODIZATION_NUTTALL:
2538                                         FLAC__window_nuttall(encoder->private_->window[i], new_blocksize);
2539                                         break;
2540                                 case FLAC__APODIZATION_RECTANGLE:
2541                                         FLAC__window_rectangle(encoder->private_->window[i], new_blocksize);
2542                                         break;
2543                                 case FLAC__APODIZATION_TRIANGLE:
2544                                         FLAC__window_triangle(encoder->private_->window[i], new_blocksize);
2545                                         break;
2546                                 case FLAC__APODIZATION_TUKEY:
2547                                         FLAC__window_tukey(encoder->private_->window[i], new_blocksize, encoder->protected_->apodizations[i].parameters.tukey.p);
2548                                         break;
2549                                 case FLAC__APODIZATION_WELCH:
2550                                         FLAC__window_welch(encoder->private_->window[i], new_blocksize);
2551                                         break;
2552                                 default:
2553                                         FLAC__ASSERT(0);
2554                                         /* double protection */
2555                                         FLAC__window_hann(encoder->private_->window[i], new_blocksize);
2556                                         break;
2557                         }
2558                 }
2559         }
2560 #endif
2561
2562         if(ok)
2563                 encoder->private_->input_capacity = new_blocksize;
2564         else
2565                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
2566
2567         return ok;
2568 }
2569
2570 FLAC__bool write_bitbuffer_(FLAC__StreamEncoder *encoder, unsigned samples, FLAC__bool is_last_block)
2571 {
2572         const FLAC__byte *buffer;
2573         size_t bytes;
2574
2575         FLAC__ASSERT(FLAC__bitwriter_is_byte_aligned(encoder->private_->frame));
2576
2577         if(!FLAC__bitwriter_get_buffer(encoder->private_->frame, &buffer, &bytes)) {
2578                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
2579                 return false;
2580         }
2581
2582         if(encoder->protected_->verify) {
2583                 encoder->private_->verify.output.data = buffer;
2584                 encoder->private_->verify.output.bytes = bytes;
2585                 if(encoder->private_->verify.state_hint == ENCODER_IN_MAGIC) {
2586                         encoder->private_->verify.needs_magic_hack = true;
2587                 }
2588                 else {
2589                         if(!FLAC__stream_decoder_process_single(encoder->private_->verify.decoder)) {
2590                                 FLAC__bitwriter_release_buffer(encoder->private_->frame);
2591                                 FLAC__bitwriter_clear(encoder->private_->frame);
2592                                 if(encoder->protected_->state != FLAC__STREAM_ENCODER_VERIFY_MISMATCH_IN_AUDIO_DATA)
2593                                         encoder->protected_->state = FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR;
2594                                 return false;
2595                         }
2596                 }
2597         }
2598
2599         if(write_frame_(encoder, buffer, bytes, samples, is_last_block) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) {
2600                 FLAC__bitwriter_release_buffer(encoder->private_->frame);
2601                 FLAC__bitwriter_clear(encoder->private_->frame);
2602                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2603                 return false;
2604         }
2605
2606         FLAC__bitwriter_release_buffer(encoder->private_->frame);
2607         FLAC__bitwriter_clear(encoder->private_->frame);
2608
2609         if(samples > 0) {
2610                 encoder->private_->streaminfo.data.stream_info.min_framesize = min(bytes, encoder->private_->streaminfo.data.stream_info.min_framesize);
2611                 encoder->private_->streaminfo.data.stream_info.max_framesize = max(bytes, encoder->private_->streaminfo.data.stream_info.max_framesize);
2612         }
2613
2614         return true;
2615 }
2616
2617 FLAC__StreamEncoderWriteStatus write_frame_(FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], size_t bytes, unsigned samples, FLAC__bool is_last_block)
2618 {
2619         FLAC__StreamEncoderWriteStatus status;
2620         FLAC__uint64 output_position = 0;
2621
2622         /* FLAC__STREAM_ENCODER_TELL_STATUS_UNSUPPORTED just means we didn't get the offset; no error */
2623         if(encoder->private_->tell_callback && encoder->private_->tell_callback(encoder, &output_position, encoder->private_->client_data) == FLAC__STREAM_ENCODER_TELL_STATUS_ERROR) {
2624                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2625                 return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;
2626         }
2627
2628         /*
2629          * Watch for the STREAMINFO block and first SEEKTABLE block to go by and store their offsets.
2630          */
2631         if(samples == 0) {
2632                 FLAC__MetadataType type = (buffer[0] & 0x7f);
2633                 if(type == FLAC__METADATA_TYPE_STREAMINFO)
2634                         encoder->protected_->streaminfo_offset = output_position;
2635                 else if(type == FLAC__METADATA_TYPE_SEEKTABLE && encoder->protected_->seektable_offset == 0)
2636                         encoder->protected_->seektable_offset = output_position;
2637         }
2638
2639         /*
2640          * Mark the current seek point if hit (if audio_offset == 0 that
2641          * means we're still writing metadata and haven't hit the first
2642          * frame yet)
2643          */
2644         if(0 != encoder->private_->seek_table && encoder->protected_->audio_offset > 0 && encoder->private_->seek_table->num_points > 0) {
2645                 const unsigned blocksize = FLAC__stream_encoder_get_blocksize(encoder);
2646                 const FLAC__uint64 frame_first_sample = encoder->private_->samples_written;
2647                 const FLAC__uint64 frame_last_sample = frame_first_sample + (FLAC__uint64)blocksize - 1;
2648                 FLAC__uint64 test_sample;
2649                 unsigned i;
2650                 for(i = encoder->private_->first_seekpoint_to_check; i < encoder->private_->seek_table->num_points; i++) {
2651                         test_sample = encoder->private_->seek_table->points[i].sample_number;
2652                         if(test_sample > frame_last_sample) {
2653                                 break;
2654                         }
2655                         else if(test_sample >= frame_first_sample) {
2656                                 encoder->private_->seek_table->points[i].sample_number = frame_first_sample;
2657                                 encoder->private_->seek_table->points[i].stream_offset = output_position - encoder->protected_->audio_offset;
2658                                 encoder->private_->seek_table->points[i].frame_samples = blocksize;
2659                                 encoder->private_->first_seekpoint_to_check++;
2660                                 /* DO NOT: "break;" and here's why:
2661                                  * The seektable template may contain more than one target
2662                                  * sample for any given frame; we will keep looping, generating
2663                                  * duplicate seekpoints for them, and we'll clean it up later,
2664                                  * just before writing the seektable back to the metadata.
2665                                  */
2666                         }
2667                         else {
2668                                 encoder->private_->first_seekpoint_to_check++;
2669                         }
2670                 }
2671         }
2672
2673 #if FLAC__HAS_OGG
2674         if(encoder->private_->is_ogg) {
2675                 status = FLAC__ogg_encoder_aspect_write_callback_wrapper(
2676                         &encoder->protected_->ogg_encoder_aspect,
2677                         buffer,
2678                         bytes,
2679                         samples,
2680                         encoder->private_->current_frame_number,
2681                         is_last_block,
2682                         (FLAC__OggEncoderAspectWriteCallbackProxy)encoder->private_->write_callback,
2683                         encoder,
2684                         encoder->private_->client_data
2685                 );
2686         }
2687         else
2688 #endif
2689         status = encoder->private_->write_callback(encoder, buffer, bytes, samples, encoder->private_->current_frame_number, encoder->private_->client_data);
2690
2691         if(status == FLAC__STREAM_ENCODER_WRITE_STATUS_OK) {
2692                 encoder->private_->bytes_written += bytes;
2693                 encoder->private_->samples_written += samples;
2694                 /* we keep a high watermark on the number of frames written because
2695                  * when the encoder goes back to write metadata, 'current_frame'
2696                  * will drop back to 0.
2697                  */
2698                 encoder->private_->frames_written = max(encoder->private_->frames_written, encoder->private_->current_frame_number+1);
2699         }
2700         else
2701                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2702
2703         return status;
2704 }
2705
2706 /* Gets called when the encoding process has finished so that we can update the STREAMINFO and SEEKTABLE blocks.  */
2707 void update_metadata_(const FLAC__StreamEncoder *encoder)
2708 {
2709         FLAC__byte b[max(6, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)];
2710         const FLAC__StreamMetadata *metadata = &encoder->private_->streaminfo;
2711         const FLAC__uint64 samples = metadata->data.stream_info.total_samples;
2712         const unsigned min_framesize = metadata->data.stream_info.min_framesize;
2713         const unsigned max_framesize = metadata->data.stream_info.max_framesize;
2714         const unsigned bps = metadata->data.stream_info.bits_per_sample;
2715         FLAC__StreamEncoderSeekStatus seek_status;
2716
2717         FLAC__ASSERT(metadata->type == FLAC__METADATA_TYPE_STREAMINFO);
2718
2719         /* All this is based on intimate knowledge of the stream header
2720          * layout, but a change to the header format that would break this
2721          * would also break all streams encoded in the previous format.
2722          */
2723
2724         /*
2725          * Write MD5 signature
2726          */
2727         {
2728                 const unsigned md5_offset =
2729                         FLAC__STREAM_METADATA_HEADER_LENGTH +
2730                         (
2731                                 FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN +
2732                                 FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN +
2733                                 FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN +
2734                                 FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN +
2735                                 FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN +
2736                                 FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN +
2737                                 FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN +
2738                                 FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN
2739                         ) / 8;
2740
2741                 if((seek_status = encoder->private_->seek_callback(encoder, encoder->protected_->streaminfo_offset + md5_offset, encoder->private_->client_data)) != FLAC__STREAM_ENCODER_SEEK_STATUS_OK) {
2742                         if(seek_status == FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR)
2743                                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2744                         return;
2745                 }
2746                 if(encoder->private_->write_callback(encoder, metadata->data.stream_info.md5sum, 16, 0, 0, encoder->private_->client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) {
2747                         encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2748                         return;
2749                 }
2750         }
2751
2752         /*
2753          * Write total samples
2754          */
2755         {
2756                 const unsigned total_samples_byte_offset =
2757                         FLAC__STREAM_METADATA_HEADER_LENGTH +
2758                         (
2759                                 FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN +
2760                                 FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN +
2761                                 FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN +
2762                                 FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN +
2763                                 FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN +
2764                                 FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN +
2765                                 FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN
2766                                 - 4
2767                         ) / 8;
2768
2769                 b[0] = ((FLAC__byte)(bps-1) << 4) | (FLAC__byte)((samples >> 32) & 0x0F);
2770                 b[1] = (FLAC__byte)((samples >> 24) & 0xFF);
2771                 b[2] = (FLAC__byte)((samples >> 16) & 0xFF);
2772                 b[3] = (FLAC__byte)((samples >> 8) & 0xFF);
2773                 b[4] = (FLAC__byte)(samples & 0xFF);
2774                 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) {
2775                         if(seek_status == FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR)
2776                                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2777                         return;
2778                 }
2779                 if(encoder->private_->write_callback(encoder, b, 5, 0, 0, encoder->private_->client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) {
2780                         encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2781                         return;
2782                 }
2783         }
2784
2785         /*
2786          * Write min/max framesize
2787          */
2788         {
2789                 const unsigned min_framesize_offset =
2790                         FLAC__STREAM_METADATA_HEADER_LENGTH +
2791                         (
2792                                 FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN +
2793                                 FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN
2794                         ) / 8;
2795
2796                 b[0] = (FLAC__byte)((min_framesize >> 16) & 0xFF);
2797                 b[1] = (FLAC__byte)((min_framesize >> 8) & 0xFF);
2798                 b[2] = (FLAC__byte)(min_framesize & 0xFF);
2799                 b[3] = (FLAC__byte)((max_framesize >> 16) & 0xFF);
2800                 b[4] = (FLAC__byte)((max_framesize >> 8) & 0xFF);
2801                 b[5] = (FLAC__byte)(max_framesize & 0xFF);
2802                 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) {
2803                         if(seek_status == FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR)
2804                                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2805                         return;
2806                 }
2807                 if(encoder->private_->write_callback(encoder, b, 6, 0, 0, encoder->private_->client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) {
2808                         encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2809                         return;
2810                 }
2811         }
2812
2813         /*
2814          * Write seektable
2815          */
2816         if(0 != encoder->private_->seek_table && encoder->private_->seek_table->num_points > 0 && encoder->protected_->seektable_offset > 0) {
2817                 unsigned i;
2818
2819                 FLAC__format_seektable_sort(encoder->private_->seek_table);
2820
2821                 FLAC__ASSERT(FLAC__format_seektable_is_legal(encoder->private_->seek_table));
2822
2823                 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) {
2824                         if(seek_status == FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR)
2825                                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2826                         return;
2827                 }
2828
2829                 for(i = 0; i < encoder->private_->seek_table->num_points; i++) {
2830                         FLAC__uint64 xx;
2831                         unsigned x;
2832                         xx = encoder->private_->seek_table->points[i].sample_number;
2833                         b[7] = (FLAC__byte)xx; xx >>= 8;
2834                         b[6] = (FLAC__byte)xx; xx >>= 8;
2835                         b[5] = (FLAC__byte)xx; xx >>= 8;
2836                         b[4] = (FLAC__byte)xx; xx >>= 8;
2837                         b[3] = (FLAC__byte)xx; xx >>= 8;
2838                         b[2] = (FLAC__byte)xx; xx >>= 8;
2839                         b[1] = (FLAC__byte)xx; xx >>= 8;
2840                         b[0] = (FLAC__byte)xx; xx >>= 8;
2841                         xx = encoder->private_->seek_table->points[i].stream_offset;
2842                         b[15] = (FLAC__byte)xx; xx >>= 8;
2843                         b[14] = (FLAC__byte)xx; xx >>= 8;
2844                         b[13] = (FLAC__byte)xx; xx >>= 8;
2845                         b[12] = (FLAC__byte)xx; xx >>= 8;
2846                         b[11] = (FLAC__byte)xx; xx >>= 8;
2847                         b[10] = (FLAC__byte)xx; xx >>= 8;
2848                         b[9] = (FLAC__byte)xx; xx >>= 8;
2849                         b[8] = (FLAC__byte)xx; xx >>= 8;
2850                         x = encoder->private_->seek_table->points[i].frame_samples;
2851                         b[17] = (FLAC__byte)x; x >>= 8;
2852                         b[16] = (FLAC__byte)x; x >>= 8;
2853                         if(encoder->private_->write_callback(encoder, b, 18, 0, 0, encoder->private_->client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) {
2854                                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
2855                                 return;
2856                         }
2857                 }
2858         }
2859 }
2860
2861 #if FLAC__HAS_OGG
2862 /* Gets called when the encoding process has finished so that we can update the STREAMINFO and SEEKTABLE blocks.  */
2863 void update_ogg_metadata_(FLAC__StreamEncoder *encoder)
2864 {
2865         /* the # of bytes in the 1st packet that precede the STREAMINFO */
2866         static const unsigned FIRST_OGG_PACKET_STREAMINFO_PREFIX_LENGTH =
2867                 FLAC__OGG_MAPPING_PACKET_TYPE_LENGTH +
2868                 FLAC__OGG_MAPPING_MAGIC_LENGTH +
2869                 FLAC__OGG_MAPPING_VERSION_MAJOR_LENGTH +
2870                 FLAC__OGG_MAPPING_VERSION_MINOR_LENGTH +
2871                 FLAC__OGG_MAPPING_NUM_HEADERS_LENGTH +
2872                 FLAC__STREAM_SYNC_LENGTH
2873         ;
2874         FLAC__byte b[max(6, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)];
2875         const FLAC__StreamMetadata *metadata = &encoder->private_->streaminfo;
2876         const FLAC__uint64 samples = metadata->data.stream_info.total_samples;
2877         const unsigned min_framesize = metadata->data.stream_info.min_framesize;
2878         const unsigned max_framesize = metadata->data.stream_info.max_framesize;
2879         ogg_page page;
2880
2881         FLAC__ASSERT(metadata->type == FLAC__METADATA_TYPE_STREAMINFO);
2882         FLAC__ASSERT(0 != encoder->private_->seek_callback);
2883
2884         /* Pre-check that client supports seeking, since we don't want the
2885          * ogg_helper code to ever have to deal with this condition.
2886          */
2887         if(encoder->private_->seek_callback(encoder, 0, encoder->private_->client_data) == FLAC__STREAM_ENCODER_SEEK_STATUS_UNSUPPORTED)
2888                 return;
2889
2890         /* All this is based on intimate knowledge of the stream header
2891          * layout, but a change to the header format that would break this
2892          * would also break all streams encoded in the previous format.
2893          */
2894
2895         /**
2896          ** Write STREAMINFO stats
2897          **/
2898         simple_ogg_page__init(&page);
2899         if(!simple_ogg_page__get_at(encoder, encoder->protected_->streaminfo_offset, &page, encoder->private_->seek_callback, encoder->private_->read_callback, encoder->private_->client_data)) {
2900                 simple_ogg_page__clear(&page);
2901                 return; /* state already set */
2902         }
2903
2904         /*
2905          * Write MD5 signature
2906          */
2907         {
2908                 const unsigned md5_offset =
2909                         FIRST_OGG_PACKET_STREAMINFO_PREFIX_LENGTH +
2910                         FLAC__STREAM_METADATA_HEADER_LENGTH +
2911                         (
2912                                 FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN +
2913                                 FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN +
2914                                 FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN +
2915                                 FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN +
2916                                 FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN +
2917                                 FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN +
2918                                 FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN +
2919                                 FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN
2920                         ) / 8;
2921
2922                 if(md5_offset + 16 > (unsigned)page.body_len) {
2923                         encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
2924                         simple_ogg_page__clear(&page);
2925                         return;
2926                 }
2927                 memcpy(page.body + md5_offset, metadata->data.stream_info.md5sum, 16);
2928         }
2929
2930         /*
2931          * Write total samples
2932          */
2933         {
2934                 const unsigned total_samples_byte_offset =
2935                         FIRST_OGG_PACKET_STREAMINFO_PREFIX_LENGTH +
2936                         FLAC__STREAM_METADATA_HEADER_LENGTH +
2937                         (
2938                                 FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN +
2939                                 FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN +
2940                                 FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN +
2941                                 FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN +
2942                                 FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN +
2943                                 FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN +
2944                                 FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN
2945                                 - 4
2946                         ) / 8;
2947
2948                 if(total_samples_byte_offset + 5 > (unsigned)page.body_len) {
2949                         encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
2950                         simple_ogg_page__clear(&page);
2951                         return;
2952                 }
2953                 b[0] = (FLAC__byte)page.body[total_samples_byte_offset] & 0xF0;
2954                 b[0] |= (FLAC__byte)((samples >> 32) & 0x0F);
2955                 b[1] = (FLAC__byte)((samples >> 24) & 0xFF);
2956                 b[2] = (FLAC__byte)((samples >> 16) & 0xFF);
2957                 b[3] = (FLAC__byte)((samples >> 8) & 0xFF);
2958                 b[4] = (FLAC__byte)(samples & 0xFF);
2959                 memcpy(page.body + total_samples_byte_offset, b, 5);
2960         }
2961
2962         /*
2963          * Write min/max framesize
2964          */
2965         {
2966                 const unsigned min_framesize_offset =
2967                         FIRST_OGG_PACKET_STREAMINFO_PREFIX_LENGTH +
2968                         FLAC__STREAM_METADATA_HEADER_LENGTH +
2969                         (
2970                                 FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN +
2971                                 FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN
2972                         ) / 8;
2973
2974                 if(min_framesize_offset + 6 > (unsigned)page.body_len) {
2975                         encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
2976                         simple_ogg_page__clear(&page);
2977                         return;
2978                 }
2979                 b[0] = (FLAC__byte)((min_framesize >> 16) & 0xFF);
2980                 b[1] = (FLAC__byte)((min_framesize >> 8) & 0xFF);
2981                 b[2] = (FLAC__byte)(min_framesize & 0xFF);
2982                 b[3] = (FLAC__byte)((max_framesize >> 16) & 0xFF);
2983                 b[4] = (FLAC__byte)((max_framesize >> 8) & 0xFF);
2984                 b[5] = (FLAC__byte)(max_framesize & 0xFF);
2985                 memcpy(page.body + min_framesize_offset, b, 6);
2986         }
2987         if(!simple_ogg_page__set_at(encoder, encoder->protected_->streaminfo_offset, &page, encoder->private_->seek_callback, encoder->private_->write_callback, encoder->private_->client_data)) {
2988                 simple_ogg_page__clear(&page);
2989                 return; /* state already set */
2990         }
2991         simple_ogg_page__clear(&page);
2992
2993         /*
2994          * Write seektable
2995          */
2996         if(0 != encoder->private_->seek_table && encoder->private_->seek_table->num_points > 0 && encoder->protected_->seektable_offset > 0) {
2997                 unsigned i;
2998                 FLAC__byte *p;
2999
3000                 FLAC__format_seektable_sort(encoder->private_->seek_table);
3001
3002                 FLAC__ASSERT(FLAC__format_seektable_is_legal(encoder->private_->seek_table));
3003
3004                 simple_ogg_page__init(&page);
3005                 if(!simple_ogg_page__get_at(encoder, encoder->protected_->seektable_offset, &page, encoder->private_->seek_callback, encoder->private_->read_callback, encoder->private_->client_data)) {
3006                         simple_ogg_page__clear(&page);
3007                         return; /* state already set */
3008                 }
3009
3010                 if((FLAC__STREAM_METADATA_HEADER_LENGTH + 18*encoder->private_->seek_table->num_points) != (unsigned)page.body_len) {
3011                         encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
3012                         simple_ogg_page__clear(&page);
3013                         return;
3014                 }
3015
3016                 for(i = 0, p = page.body + FLAC__STREAM_METADATA_HEADER_LENGTH; i < encoder->private_->seek_table->num_points; i++, p += 18) {
3017                         FLAC__uint64 xx;
3018                         unsigned x;
3019                         xx = encoder->private_->seek_table->points[i].sample_number;
3020                         b[7] = (FLAC__byte)xx; xx >>= 8;
3021                         b[6] = (FLAC__byte)xx; xx >>= 8;
3022                         b[5] = (FLAC__byte)xx; xx >>= 8;
3023                         b[4] = (FLAC__byte)xx; xx >>= 8;
3024                         b[3] = (FLAC__byte)xx; xx >>= 8;
3025                         b[2] = (FLAC__byte)xx; xx >>= 8;
3026                         b[1] = (FLAC__byte)xx; xx >>= 8;
3027                         b[0] = (FLAC__byte)xx; xx >>= 8;
3028                         xx = encoder->private_->seek_table->points[i].stream_offset;
3029                         b[15] = (FLAC__byte)xx; xx >>= 8;
3030                         b[14] = (FLAC__byte)xx; xx >>= 8;
3031                         b[13] = (FLAC__byte)xx; xx >>= 8;
3032                         b[12] = (FLAC__byte)xx; xx >>= 8;
3033                         b[11] = (FLAC__byte)xx; xx >>= 8;
3034                         b[10] = (FLAC__byte)xx; xx >>= 8;
3035                         b[9] = (FLAC__byte)xx; xx >>= 8;
3036                         b[8] = (FLAC__byte)xx; xx >>= 8;
3037                         x = encoder->private_->seek_table->points[i].frame_samples;
3038                         b[17] = (FLAC__byte)x; x >>= 8;
3039                         b[16] = (FLAC__byte)x; x >>= 8;
3040                         memcpy(p, b, 18);
3041                 }
3042
3043                 if(!simple_ogg_page__set_at(encoder, encoder->protected_->seektable_offset, &page, encoder->private_->seek_callback, encoder->private_->write_callback, encoder->private_->client_data)) {
3044                         simple_ogg_page__clear(&page);
3045                         return; /* state already set */
3046                 }
3047                 simple_ogg_page__clear(&page);
3048         }
3049 }
3050 #endif
3051
3052 FLAC__bool process_frame_(FLAC__StreamEncoder *encoder, FLAC__bool is_fractional_block, FLAC__bool is_last_block)
3053 {
3054         FLAC__uint16 crc;
3055         FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
3056
3057         /*
3058          * Accumulate raw signal to the MD5 signature
3059          */
3060         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)) {
3061                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
3062                 return false;
3063         }
3064
3065         /*
3066          * Process the frame header and subframes into the frame bitbuffer
3067          */
3068         if(!process_subframes_(encoder, is_fractional_block)) {
3069                 /* the above function sets the state for us in case of an error */
3070                 return false;
3071         }
3072
3073         /*
3074          * Zero-pad the frame to a byte_boundary
3075          */
3076         if(!FLAC__bitwriter_zero_pad_to_byte_boundary(encoder->private_->frame)) {
3077                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
3078                 return false;
3079         }
3080
3081         /*
3082          * CRC-16 the whole thing
3083          */
3084         FLAC__ASSERT(FLAC__bitwriter_is_byte_aligned(encoder->private_->frame));
3085         if(
3086                 !FLAC__bitwriter_get_write_crc16(encoder->private_->frame, &crc) ||
3087                 !FLAC__bitwriter_write_raw_uint32(encoder->private_->frame, crc, FLAC__FRAME_FOOTER_CRC_LEN)
3088         ) {
3089                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
3090                 return false;
3091         }
3092
3093         /*
3094          * Write it
3095          */
3096         if(!write_bitbuffer_(encoder, encoder->protected_->blocksize, is_last_block)) {
3097                 /* the above function sets the state for us in case of an error */
3098                 return false;
3099         }
3100
3101         /*
3102          * Get ready for the next frame
3103          */
3104         encoder->private_->current_sample_number = 0;
3105         encoder->private_->current_frame_number++;
3106         encoder->private_->streaminfo.data.stream_info.total_samples += (FLAC__uint64)encoder->protected_->blocksize;
3107
3108         return true;
3109 }
3110
3111 FLAC__bool process_subframes_(FLAC__StreamEncoder *encoder, FLAC__bool is_fractional_block)
3112 {
3113         FLAC__FrameHeader frame_header;
3114         unsigned channel, min_partition_order = encoder->protected_->min_residual_partition_order, max_partition_order;
3115         FLAC__bool do_independent, do_mid_side;
3116
3117         /*
3118          * Calculate the min,max Rice partition orders
3119          */
3120         if(is_fractional_block) {
3121                 max_partition_order = 0;
3122         }
3123         else {
3124                 max_partition_order = FLAC__format_get_max_rice_partition_order_from_blocksize(encoder->protected_->blocksize);
3125                 max_partition_order = min(max_partition_order, encoder->protected_->max_residual_partition_order);
3126         }
3127         min_partition_order = min(min_partition_order, max_partition_order);
3128
3129         /*
3130          * Setup the frame
3131          */
3132         frame_header.blocksize = encoder->protected_->blocksize;
3133         frame_header.sample_rate = encoder->protected_->sample_rate;
3134         frame_header.channels = encoder->protected_->channels;
3135         frame_header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT; /* the default unless the encoder determines otherwise */
3136         frame_header.bits_per_sample = encoder->protected_->bits_per_sample;
3137         frame_header.number_type = FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER;
3138         frame_header.number.frame_number = encoder->private_->current_frame_number;
3139
3140         /*
3141          * Figure out what channel assignments to try
3142          */
3143         if(encoder->protected_->do_mid_side_stereo) {
3144                 if(encoder->protected_->loose_mid_side_stereo) {
3145                         if(encoder->private_->loose_mid_side_stereo_frame_count == 0) {
3146                                 do_independent = true;
3147                                 do_mid_side = true;
3148                         }
3149                         else {
3150                                 do_independent = (encoder->private_->last_channel_assignment == FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT);
3151                                 do_mid_side = !do_independent;
3152                         }
3153                 }
3154                 else {
3155                         do_independent = true;
3156                         do_mid_side = true;
3157                 }
3158         }
3159         else {
3160                 do_independent = true;
3161                 do_mid_side = false;
3162         }
3163
3164         FLAC__ASSERT(do_independent || do_mid_side);
3165
3166         /*
3167          * Check for wasted bits; set effective bps for each subframe
3168          */
3169         if(do_independent) {
3170                 for(channel = 0; channel < encoder->protected_->channels; channel++) {
3171                         const unsigned w = get_wasted_bits_(encoder->private_->integer_signal[channel], encoder->protected_->blocksize);
3172                         encoder->private_->subframe_workspace[channel][0].wasted_bits = encoder->private_->subframe_workspace[channel][1].wasted_bits = w;
3173                         encoder->private_->subframe_bps[channel] = encoder->protected_->bits_per_sample - w;
3174                 }
3175         }
3176         if(do_mid_side) {
3177                 FLAC__ASSERT(encoder->protected_->channels == 2);
3178                 for(channel = 0; channel < 2; channel++) {
3179                         const unsigned w = get_wasted_bits_(encoder->private_->integer_signal_mid_side[channel], encoder->protected_->blocksize);
3180                         encoder->private_->subframe_workspace_mid_side[channel][0].wasted_bits = encoder->private_->subframe_workspace_mid_side[channel][1].wasted_bits = w;
3181                         encoder->private_->subframe_bps_mid_side[channel] = encoder->protected_->bits_per_sample - w + (channel==0? 0:1);
3182                 }
3183         }
3184
3185         /*
3186          * First do a normal encoding pass of each independent channel
3187          */
3188         if(do_independent) {
3189                 for(channel = 0; channel < encoder->protected_->channels; channel++) {
3190                         if(!
3191                                 process_subframe_(
3192                                         encoder,
3193                                         min_partition_order,
3194                                         max_partition_order,
3195                                         &frame_header,
3196                                         encoder->private_->subframe_bps[channel],
3197                                         encoder->private_->integer_signal[channel],
3198 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3199                                         encoder->private_->real_signal[channel],
3200 #endif
3201                                         encoder->private_->subframe_workspace_ptr[channel],
3202                                         encoder->private_->partitioned_rice_contents_workspace_ptr[channel],
3203                                         encoder->private_->residual_workspace[channel],
3204                                         encoder->private_->best_subframe+channel,
3205                                         encoder->private_->best_subframe_bits+channel
3206                                 )
3207                         )
3208                                 return false;
3209                 }
3210         }
3211
3212         /*
3213          * Now do mid and side channels if requested
3214          */
3215         if(do_mid_side) {
3216                 FLAC__ASSERT(encoder->protected_->channels == 2);
3217
3218                 for(channel = 0; channel < 2; channel++) {
3219                         if(!
3220                                 process_subframe_(
3221                                         encoder,
3222                                         min_partition_order,
3223                                         max_partition_order,
3224                                         &frame_header,
3225                                         encoder->private_->subframe_bps_mid_side[channel],
3226                                         encoder->private_->integer_signal_mid_side[channel],
3227 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3228                                         encoder->private_->real_signal_mid_side[channel],
3229 #endif
3230                                         encoder->private_->subframe_workspace_ptr_mid_side[channel],
3231                                         encoder->private_->partitioned_rice_contents_workspace_ptr_mid_side[channel],
3232                                         encoder->private_->residual_workspace_mid_side[channel],
3233                                         encoder->private_->best_subframe_mid_side+channel,
3234                                         encoder->private_->best_subframe_bits_mid_side+channel
3235                                 )
3236                         )
3237                                 return false;
3238                 }
3239         }
3240
3241         /*
3242          * Compose the frame bitbuffer
3243          */
3244         if(do_mid_side) {
3245                 unsigned left_bps = 0, right_bps = 0; /* initialized only to prevent superfluous compiler warning */
3246                 FLAC__Subframe *left_subframe = 0, *right_subframe = 0; /* initialized only to prevent superfluous compiler warning */
3247                 FLAC__ChannelAssignment channel_assignment;
3248
3249                 FLAC__ASSERT(encoder->protected_->channels == 2);
3250
3251                 if(encoder->protected_->loose_mid_side_stereo && encoder->private_->loose_mid_side_stereo_frame_count > 0) {
3252                         channel_assignment = (encoder->private_->last_channel_assignment == FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT? FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT : FLAC__CHANNEL_ASSIGNMENT_MID_SIDE);
3253                 }
3254                 else {
3255                         unsigned bits[4]; /* WATCHOUT - indexed by FLAC__ChannelAssignment */
3256                         unsigned min_bits;
3257                         int ca;
3258
3259                         FLAC__ASSERT(FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT == 0);
3260                         FLAC__ASSERT(FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE   == 1);
3261                         FLAC__ASSERT(FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE  == 2);
3262                         FLAC__ASSERT(FLAC__CHANNEL_ASSIGNMENT_MID_SIDE    == 3);
3263                         FLAC__ASSERT(do_independent && do_mid_side);
3264
3265                         /* We have to figure out which channel assignent results in the smallest frame */
3266                         bits[FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT] = encoder->private_->best_subframe_bits         [0] + encoder->private_->best_subframe_bits         [1];
3267                         bits[FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE  ] = encoder->private_->best_subframe_bits         [0] + encoder->private_->best_subframe_bits_mid_side[1];
3268                         bits[FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE ] = encoder->private_->best_subframe_bits         [1] + encoder->private_->best_subframe_bits_mid_side[1];
3269                         bits[FLAC__CHANNEL_ASSIGNMENT_MID_SIDE   ] = encoder->private_->best_subframe_bits_mid_side[0] + encoder->private_->best_subframe_bits_mid_side[1];
3270
3271                         channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT;
3272                         min_bits = bits[channel_assignment];
3273                         for(ca = 1; ca <= 3; ca++) {
3274                                 if(bits[ca] < min_bits) {
3275                                         min_bits = bits[ca];
3276                                         channel_assignment = (FLAC__ChannelAssignment)ca;
3277                                 }
3278                         }
3279                 }
3280
3281                 frame_header.channel_assignment = channel_assignment;
3282
3283                 if(!FLAC__frame_add_header(&frame_header, encoder->private_->frame)) {
3284                         encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
3285                         return false;
3286                 }
3287
3288                 switch(channel_assignment) {
3289                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
3290                                 left_subframe  = &encoder->private_->subframe_workspace         [0][encoder->private_->best_subframe         [0]];
3291                                 right_subframe = &encoder->private_->subframe_workspace         [1][encoder->private_->best_subframe         [1]];
3292                                 break;
3293                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
3294                                 left_subframe  = &encoder->private_->subframe_workspace         [0][encoder->private_->best_subframe         [0]];
3295                                 right_subframe = &encoder->private_->subframe_workspace_mid_side[1][encoder->private_->best_subframe_mid_side[1]];
3296                                 break;
3297                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
3298                                 left_subframe  = &encoder->private_->subframe_workspace_mid_side[1][encoder->private_->best_subframe_mid_side[1]];
3299                                 right_subframe = &encoder->private_->subframe_workspace         [1][encoder->private_->best_subframe         [1]];
3300                                 break;
3301                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
3302                                 left_subframe  = &encoder->private_->subframe_workspace_mid_side[0][encoder->private_->best_subframe_mid_side[0]];
3303                                 right_subframe = &encoder->private_->subframe_workspace_mid_side[1][encoder->private_->best_subframe_mid_side[1]];
3304                                 break;
3305                         default:
3306                                 FLAC__ASSERT(0);
3307                 }
3308
3309                 switch(channel_assignment) {
3310                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
3311                                 left_bps  = encoder->private_->subframe_bps         [0];
3312                                 right_bps = encoder->private_->subframe_bps         [1];
3313                                 break;
3314                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
3315                                 left_bps  = encoder->private_->subframe_bps         [0];
3316                                 right_bps = encoder->private_->subframe_bps_mid_side[1];
3317                                 break;
3318                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
3319                                 left_bps  = encoder->private_->subframe_bps_mid_side[1];
3320                                 right_bps = encoder->private_->subframe_bps         [1];
3321                                 break;
3322                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
3323                                 left_bps  = encoder->private_->subframe_bps_mid_side[0];
3324                                 right_bps = encoder->private_->subframe_bps_mid_side[1];
3325                                 break;
3326                         default:
3327                                 FLAC__ASSERT(0);
3328                 }
3329
3330                 /* note that encoder_add_subframe_ sets the state for us in case of an error */
3331                 if(!add_subframe_(encoder, frame_header.blocksize, left_bps , left_subframe , encoder->private_->frame))
3332                         return false;
3333                 if(!add_subframe_(encoder, frame_header.blocksize, right_bps, right_subframe, encoder->private_->frame))
3334                         return false;
3335         }
3336         else {
3337                 if(!FLAC__frame_add_header(&frame_header, encoder->private_->frame)) {
3338                         encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
3339                         return false;
3340                 }
3341
3342                 for(channel = 0; channel < encoder->protected_->channels; channel++) {
3343                         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)) {
3344                                 /* the above function sets the state for us in case of an error */
3345                                 return false;
3346                         }
3347                 }
3348         }
3349
3350         if(encoder->protected_->loose_mid_side_stereo) {
3351                 encoder->private_->loose_mid_side_stereo_frame_count++;
3352                 if(encoder->private_->loose_mid_side_stereo_frame_count >= encoder->private_->loose_mid_side_stereo_frames)
3353                         encoder->private_->loose_mid_side_stereo_frame_count = 0;
3354         }
3355
3356         encoder->private_->last_channel_assignment = frame_header.channel_assignment;
3357
3358         return true;
3359 }
3360
3361 FLAC__bool process_subframe_(
3362         FLAC__StreamEncoder *encoder,
3363         unsigned min_partition_order,
3364         unsigned max_partition_order,
3365         const FLAC__FrameHeader *frame_header,
3366         unsigned subframe_bps,
3367         const FLAC__int32 integer_signal[],
3368 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3369         const FLAC__real real_signal[],
3370 #endif
3371         FLAC__Subframe *subframe[2],
3372         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents[2],
3373         FLAC__int32 *residual[2],
3374         unsigned *best_subframe,
3375         unsigned *best_bits
3376 )
3377 {
3378 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3379         FLAC__float fixed_residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1];
3380 #else
3381         FLAC__fixedpoint fixed_residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1];
3382 #endif
3383 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3384         FLAC__double lpc_residual_bits_per_sample;
3385         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 */
3386         FLAC__double lpc_error[FLAC__MAX_LPC_ORDER];
3387         unsigned min_lpc_order, max_lpc_order, lpc_order;
3388         unsigned min_qlp_coeff_precision, max_qlp_coeff_precision, qlp_coeff_precision;
3389 #endif
3390         unsigned min_fixed_order, max_fixed_order, guess_fixed_order, fixed_order;
3391         unsigned rice_parameter;
3392         unsigned _candidate_bits, _best_bits;
3393         unsigned _best_subframe;
3394
3395         FLAC__ASSERT(frame_header->blocksize > 0);
3396
3397         /* verbatim subframe is the baseline against which we measure other compressed subframes */
3398         _best_subframe = 0;
3399         if(encoder->private_->disable_verbatim_subframes && frame_header->blocksize >= FLAC__MAX_FIXED_ORDER)
3400                 _best_bits = UINT_MAX;
3401         else
3402                 _best_bits = evaluate_verbatim_subframe_(encoder, integer_signal, frame_header->blocksize, subframe_bps, subframe[_best_subframe]);
3403
3404         if(frame_header->blocksize >= FLAC__MAX_FIXED_ORDER) {
3405                 unsigned signal_is_constant = false;
3406                 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);
3407                 /* check for constant subframe */
3408                 if(
3409                         !encoder->private_->disable_constant_subframes &&
3410 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3411                         fixed_residual_bits_per_sample[1] == 0.0
3412 #else
3413                         fixed_residual_bits_per_sample[1] == FLAC__FP_ZERO
3414 #endif
3415                 ) {
3416                         /* the above means it's possible all samples are the same value; now double-check it: */
3417                         unsigned i;
3418                         signal_is_constant = true;
3419                         for(i = 1; i < frame_header->blocksize; i++) {
3420                                 if(integer_signal[0] != integer_signal[i]) {
3421                                         signal_is_constant = false;
3422                                         break;
3423                                 }
3424                         }
3425                 }
3426                 if(signal_is_constant) {
3427                         _candidate_bits = evaluate_constant_subframe_(encoder, integer_signal[0], frame_header->blocksize, subframe_bps, subframe[!_best_subframe]);
3428                         if(_candidate_bits < _best_bits) {
3429                                 _best_subframe = !_best_subframe;
3430                                 _best_bits = _candidate_bits;
3431                         }
3432                 }
3433                 else {
3434                         if(!encoder->private_->disable_fixed_subframes || (encoder->protected_->max_lpc_order == 0 && _best_bits == UINT_MAX)) {
3435                                 /* encode fixed */
3436                                 if(encoder->protected_->do_exhaustive_model_search) {
3437                                         min_fixed_order = 0;
3438                                         max_fixed_order = FLAC__MAX_FIXED_ORDER;
3439                                 }
3440                                 else {
3441                                         min_fixed_order = max_fixed_order = guess_fixed_order;
3442                                 }
3443                                 if(max_fixed_order >= frame_header->blocksize)
3444                                         max_fixed_order = frame_header->blocksize - 1;
3445                                 for(fixed_order = min_fixed_order; fixed_order <= max_fixed_order; fixed_order++) {
3446 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3447                                         if(fixed_residual_bits_per_sample[fixed_order] >= (FLAC__float)subframe_bps)
3448                                                 continue; /* don't even try */
3449                                         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 */
3450 #else
3451                                         if(FLAC__fixedpoint_trunc(fixed_residual_bits_per_sample[fixed_order]) >= (int)subframe_bps)
3452                                                 continue; /* don't even try */
3453                                         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 */
3454 #endif
3455                                         rice_parameter++; /* to account for the signed->unsigned conversion during rice coding */
3456                                         if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
3457 #ifdef DEBUG_VERBOSE
3458                                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @0\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
3459 #endif
3460                                                 rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
3461                                         }
3462                                         _candidate_bits =
3463                                                 evaluate_fixed_subframe_(
3464                                                         encoder,
3465                                                         integer_signal,
3466                                                         residual[!_best_subframe],
3467                                                         encoder->private_->abs_residual_partition_sums,
3468                                                         encoder->private_->raw_bits_per_partition,
3469                                                         frame_header->blocksize,
3470                                                         subframe_bps,
3471                                                         fixed_order,
3472                                                         rice_parameter,
3473                                                         min_partition_order,
3474                                                         max_partition_order,
3475                                                         encoder->protected_->do_escape_coding,
3476                                                         encoder->protected_->rice_parameter_search_dist,
3477                                                         subframe[!_best_subframe],
3478                                                         partitioned_rice_contents[!_best_subframe]
3479                                                 );
3480                                         if(_candidate_bits < _best_bits) {
3481                                                 _best_subframe = !_best_subframe;
3482                                                 _best_bits = _candidate_bits;
3483                                         }
3484                                 }
3485                         }
3486
3487 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3488                         /* encode lpc */
3489                         if(encoder->protected_->max_lpc_order > 0) {
3490                                 if(encoder->protected_->max_lpc_order >= frame_header->blocksize)
3491                                         max_lpc_order = frame_header->blocksize-1;
3492                                 else
3493                                         max_lpc_order = encoder->protected_->max_lpc_order;
3494                                 if(max_lpc_order > 0) {
3495                                         unsigned a;
3496                                         for (a = 0; a < encoder->protected_->num_apodizations; a++) {
3497                                                 FLAC__lpc_window_data(real_signal, encoder->private_->window[a], encoder->private_->windowed_signal, frame_header->blocksize);
3498                                                 encoder->private_->local_lpc_compute_autocorrelation(encoder->private_->windowed_signal, frame_header->blocksize, max_lpc_order+1, autoc);
3499                                                 /* if autoc[0] == 0.0, the signal is constant and we usually won't get here, but it can happen */
3500                                                 if(autoc[0] != 0.0) {
3501                                                         FLAC__lpc_compute_lp_coefficients(autoc, &max_lpc_order, encoder->private_->lp_coeff, lpc_error);
3502                                                         if(encoder->protected_->do_exhaustive_model_search) {
3503                                                                 min_lpc_order = 1;
3504                                                         }
3505                                                         else {
3506                                                                 const unsigned guess_lpc_order =
3507                                                                         FLAC__lpc_compute_best_order(
3508                                                                                 lpc_error,
3509                                                                                 max_lpc_order,
3510                                                                                 frame_header->blocksize,
3511                                                                                 subframe_bps + (
3512                                                                                         encoder->protected_->do_qlp_coeff_prec_search?
3513                                                                                                 FLAC__MIN_QLP_COEFF_PRECISION : /* have to guess; use the min possible size to avoid accidentally favoring lower orders */
3514                                                                                                 encoder->protected_->qlp_coeff_precision
3515                                                                                 )
3516                                                                         );
3517                                                                 min_lpc_order = max_lpc_order = guess_lpc_order;
3518                                                         }
3519                                                         if(max_lpc_order >= frame_header->blocksize)
3520                                                                 max_lpc_order = frame_header->blocksize - 1;
3521                                                         for(lpc_order = min_lpc_order; lpc_order <= max_lpc_order; lpc_order++) {
3522                                                                 lpc_residual_bits_per_sample = FLAC__lpc_compute_expected_bits_per_residual_sample(lpc_error[lpc_order-1], frame_header->blocksize-lpc_order);
3523                                                                 if(lpc_residual_bits_per_sample >= (FLAC__double)subframe_bps)
3524                                                                         continue; /* don't even try */
3525                                                                 rice_parameter = (lpc_residual_bits_per_sample > 0.0)? (unsigned)(lpc_residual_bits_per_sample+0.5) : 0; /* 0.5 is for rounding */
3526                                                                 rice_parameter++; /* to account for the signed->unsigned conversion during rice coding */
3527                                                                 if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
3528 #ifdef DEBUG_VERBOSE
3529                                                                         fprintf(stderr, "clipping rice_parameter (%u -> %u) @1\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
3530 #endif
3531                                                                         rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
3532                                                                 }
3533                                                                 if(encoder->protected_->do_qlp_coeff_prec_search) {
3534                                                                         min_qlp_coeff_precision = FLAC__MIN_QLP_COEFF_PRECISION;
3535                                                                         /* try to ensure a 32-bit datapath throughout for 16bps(+1bps for side channel) or less */
3536                                                                         if(subframe_bps <= 17) {
3537                                                                                 max_qlp_coeff_precision = min(32 - subframe_bps - lpc_order, FLAC__MAX_QLP_COEFF_PRECISION);
3538                                                                                 max_qlp_coeff_precision = max(max_qlp_coeff_precision, min_qlp_coeff_precision);
3539                                                                         }
3540                                                                         else
3541                                                                                 max_qlp_coeff_precision = FLAC__MAX_QLP_COEFF_PRECISION;
3542                                                                 }
3543                                                                 else {
3544                                                                         min_qlp_coeff_precision = max_qlp_coeff_precision = encoder->protected_->qlp_coeff_precision;
3545                                                                 }
3546                                                                 for(qlp_coeff_precision = min_qlp_coeff_precision; qlp_coeff_precision <= max_qlp_coeff_precision; qlp_coeff_precision++) {
3547                                                                         _candidate_bits =
3548                                                                                 evaluate_lpc_subframe_(
3549                                                                                         encoder,
3550                                                                                         integer_signal,
3551                                                                                         residual[!_best_subframe],
3552                                                                                         encoder->private_->abs_residual_partition_sums,
3553                                                                                         encoder->private_->raw_bits_per_partition,
3554                                                                                         encoder->private_->lp_coeff[lpc_order-1],
3555                                                                                         frame_header->blocksize,
3556                                                                                         subframe_bps,
3557                                                                                         lpc_order,
3558                                                                                         qlp_coeff_precision,
3559                                                                                         rice_parameter,
3560                                                                                         min_partition_order,
3561                                                                                         max_partition_order,
3562                                                                                         encoder->protected_->do_escape_coding,
3563                                                                                         encoder->protected_->rice_parameter_search_dist,
3564                                                                                         subframe[!_best_subframe],
3565                                                                                         partitioned_rice_contents[!_best_subframe]
3566                                                                                 );
3567                                                                         if(_candidate_bits > 0) { /* if == 0, there was a problem quantizing the lpcoeffs */
3568                                                                                 if(_candidate_bits < _best_bits) {
3569                                                                                         _best_subframe = !_best_subframe;
3570                                                                                         _best_bits = _candidate_bits;
3571                                                                                 }
3572                                                                         }
3573                                                                 }
3574                                                         }
3575                                                 }
3576                                         }
3577                                 }
3578                         }
3579 #endif /* !defined FLAC__INTEGER_ONLY_LIBRARY */
3580                 }
3581         }
3582
3583         /* under rare circumstances this can happen when all but lpc subframe types are disabled: */
3584         if(_best_bits == UINT_MAX) {
3585                 FLAC__ASSERT(_best_subframe == 0);
3586                 _best_bits = evaluate_verbatim_subframe_(encoder, integer_signal, frame_header->blocksize, subframe_bps, subframe[_best_subframe]);
3587         }
3588
3589         *best_subframe = _best_subframe;
3590         *best_bits = _best_bits;
3591
3592         return true;
3593 }
3594
3595 FLAC__bool add_subframe_(
3596         FLAC__StreamEncoder *encoder,
3597         unsigned blocksize,
3598         unsigned subframe_bps,
3599         const FLAC__Subframe *subframe,
3600         FLAC__BitWriter *frame
3601 )
3602 {
3603         switch(subframe->type) {
3604                 case FLAC__SUBFRAME_TYPE_CONSTANT:
3605                         if(!FLAC__subframe_add_constant(&(subframe->data.constant), subframe_bps, subframe->wasted_bits, frame)) {
3606                                 encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
3607                                 return false;
3608                         }
3609                         break;
3610                 case FLAC__SUBFRAME_TYPE_FIXED:
3611                         if(!FLAC__subframe_add_fixed(&(subframe->data.fixed), blocksize - subframe->data.fixed.order, subframe_bps, subframe->wasted_bits, frame)) {
3612                                 encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
3613                                 return false;
3614                         }
3615                         break;
3616                 case FLAC__SUBFRAME_TYPE_LPC:
3617                         if(!FLAC__subframe_add_lpc(&(subframe->data.lpc), blocksize - subframe->data.lpc.order, subframe_bps, subframe->wasted_bits, frame)) {
3618                                 encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
3619                                 return false;
3620                         }
3621                         break;
3622                 case FLAC__SUBFRAME_TYPE_VERBATIM:
3623                         if(!FLAC__subframe_add_verbatim(&(subframe->data.verbatim), blocksize, subframe_bps, subframe->wasted_bits, frame)) {
3624                                 encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
3625                                 return false;
3626                         }
3627                         break;
3628                 default:
3629                         FLAC__ASSERT(0);
3630         }
3631
3632         return true;
3633 }
3634
3635 #define SPOTCHECK_ESTIMATE 0 //@@@@@@@@@
3636 #if SPOTCHECK_ESTIMATE
3637 static void spotcheck_subframe_estimate_(
3638         FLAC__StreamEncoder *encoder,
3639         unsigned blocksize,
3640         unsigned subframe_bps,
3641         const FLAC__Subframe *subframe,
3642         unsigned estimate
3643 )
3644 {
3645         FLAC__bool ret;
3646         FLAC__BitWriter *frame = FLAC__bitwriter_new();
3647         if(frame == 0) {
3648                 fprintf(stderr, "EST: can't allocate frame\n");
3649                 return;
3650         }
3651         if(!FLAC__bitwriter_init(frame)) {
3652                 fprintf(stderr, "EST: can't init frame\n");
3653                 return;
3654         }
3655         ret = add_subframe_(encoder, blocksize, subframe_bps, subframe, frame);
3656         FLAC__ASSERT(ret);
3657         {
3658                 const unsigned actual = FLAC__bitwriter_get_input_bits_unconsumed(frame);
3659                 if(estimate != actual)
3660                         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);
3661         }
3662         FLAC__bitwriter_delete(frame);
3663 }
3664 #endif
3665
3666 unsigned evaluate_constant_subframe_(
3667         FLAC__StreamEncoder *encoder,
3668         const FLAC__int32 signal,
3669         unsigned blocksize,
3670         unsigned subframe_bps,
3671         FLAC__Subframe *subframe
3672 )
3673 {
3674         unsigned estimate;
3675         subframe->type = FLAC__SUBFRAME_TYPE_CONSTANT;
3676         subframe->data.constant.value = signal;
3677
3678         estimate = FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + subframe->wasted_bits + subframe_bps;
3679
3680 #if SPOTCHECK_ESTIMATE
3681         spotcheck_subframe_estimate_(encoder, blocksize, subframe_bps, subframe, estimate);
3682 #else
3683         (void)encoder, (void)blocksize;
3684 #endif
3685
3686         return estimate;
3687 }
3688
3689 unsigned evaluate_fixed_subframe_(
3690         FLAC__StreamEncoder *encoder,
3691         const FLAC__int32 signal[],
3692         FLAC__int32 residual[],
3693         FLAC__uint64 abs_residual_partition_sums[],
3694         unsigned raw_bits_per_partition[],
3695         unsigned blocksize,
3696         unsigned subframe_bps,
3697         unsigned order,
3698         unsigned rice_parameter,
3699         unsigned min_partition_order,
3700         unsigned max_partition_order,
3701         FLAC__bool do_escape_coding,
3702         unsigned rice_parameter_search_dist,
3703         FLAC__Subframe *subframe,
3704         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents
3705 )
3706 {
3707         unsigned i, residual_bits, estimate;
3708         const unsigned residual_samples = blocksize - order;
3709
3710         FLAC__fixed_compute_residual(signal+order, residual_samples, order, residual);
3711
3712         subframe->type = FLAC__SUBFRAME_TYPE_FIXED;
3713
3714         subframe->data.fixed.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE;
3715         subframe->data.fixed.entropy_coding_method.data.partitioned_rice.contents = partitioned_rice_contents;
3716         subframe->data.fixed.residual = residual;
3717
3718         residual_bits =
3719                 find_best_partition_order_(
3720                         encoder->private_,
3721                         residual,
3722                         abs_residual_partition_sums,
3723                         raw_bits_per_partition,
3724                         residual_samples,
3725                         order,
3726                         rice_parameter,
3727                         min_partition_order,
3728                         max_partition_order,
3729                         do_escape_coding,
3730                         rice_parameter_search_dist,
3731                         &subframe->data.fixed.entropy_coding_method.data.partitioned_rice
3732                 );
3733
3734         subframe->data.fixed.order = order;
3735         for(i = 0; i < order; i++)
3736                 subframe->data.fixed.warmup[i] = signal[i];
3737
3738         estimate = FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + subframe->wasted_bits + (order * subframe_bps) + residual_bits;
3739
3740 #if SPOTCHECK_ESTIMATE
3741         spotcheck_subframe_estimate_(encoder, blocksize, subframe_bps, subframe, estimate);
3742 #endif
3743
3744         return estimate;
3745 }
3746
3747 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3748 unsigned evaluate_lpc_subframe_(
3749         FLAC__StreamEncoder *encoder,
3750         const FLAC__int32 signal[],
3751         FLAC__int32 residual[],
3752         FLAC__uint64 abs_residual_partition_sums[],
3753         unsigned raw_bits_per_partition[],
3754         const FLAC__real lp_coeff[],
3755         unsigned blocksize,
3756         unsigned subframe_bps,
3757         unsigned order,
3758         unsigned qlp_coeff_precision,
3759         unsigned rice_parameter,
3760         unsigned min_partition_order,
3761         unsigned max_partition_order,
3762         FLAC__bool do_escape_coding,
3763         unsigned rice_parameter_search_dist,
3764         FLAC__Subframe *subframe,
3765         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents
3766 )
3767 {
3768         FLAC__int32 qlp_coeff[FLAC__MAX_LPC_ORDER];
3769         unsigned i, residual_bits, estimate;
3770         int quantization, ret;
3771         const unsigned residual_samples = blocksize - order;
3772
3773         /* try to keep qlp coeff precision such that only 32-bit math is required for decode of <=16bps streams */
3774         if(subframe_bps <= 16) {
3775                 FLAC__ASSERT(order > 0);
3776                 FLAC__ASSERT(order <= FLAC__MAX_LPC_ORDER);
3777                 qlp_coeff_precision = min(qlp_coeff_precision, 32 - subframe_bps - FLAC__bitmath_ilog2(order));
3778         }
3779
3780         ret = FLAC__lpc_quantize_coefficients(lp_coeff, order, qlp_coeff_precision, qlp_coeff, &quantization);
3781         if(ret != 0)
3782                 return 0; /* this is a hack to indicate to the caller that we can't do lp at this order on this subframe */
3783
3784         if(subframe_bps + qlp_coeff_precision + FLAC__bitmath_ilog2(order) <= 32)
3785                 if(subframe_bps <= 16 && qlp_coeff_precision <= 16)
3786                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit(signal+order, residual_samples, qlp_coeff, order, quantization, residual);
3787                 else
3788                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients(signal+order, residual_samples, qlp_coeff, order, quantization, residual);
3789         else
3790                 encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_64bit(signal+order, residual_samples, qlp_coeff, order, quantization, residual);
3791
3792         subframe->type = FLAC__SUBFRAME_TYPE_LPC;
3793
3794         subframe->data.lpc.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE;
3795         subframe->data.lpc.entropy_coding_method.data.partitioned_rice.contents = partitioned_rice_contents;
3796         subframe->data.lpc.residual = residual;
3797
3798         residual_bits =
3799                 find_best_partition_order_(
3800                         encoder->private_,
3801                         residual,
3802                         abs_residual_partition_sums,
3803                         raw_bits_per_partition,
3804                         residual_samples,
3805                         order,
3806                         rice_parameter,
3807                         min_partition_order,
3808                         max_partition_order,
3809                         do_escape_coding,
3810                         rice_parameter_search_dist,
3811                         &subframe->data.lpc.entropy_coding_method.data.partitioned_rice
3812                 );
3813
3814         subframe->data.lpc.order = order;
3815         subframe->data.lpc.qlp_coeff_precision = qlp_coeff_precision;
3816         subframe->data.lpc.quantization_level = quantization;
3817         memcpy(subframe->data.lpc.qlp_coeff, qlp_coeff, sizeof(FLAC__int32)*FLAC__MAX_LPC_ORDER);
3818         for(i = 0; i < order; i++)
3819                 subframe->data.lpc.warmup[i] = signal[i];
3820
3821         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;
3822
3823 #if SPOTCHECK_ESTIMATE
3824         spotcheck_subframe_estimate_(encoder, blocksize, subframe_bps, subframe, estimate);
3825 #endif
3826
3827         return estimate;
3828 }
3829 #endif
3830
3831 unsigned evaluate_verbatim_subframe_(
3832         FLAC__StreamEncoder *encoder,
3833         const FLAC__int32 signal[],
3834         unsigned blocksize,
3835         unsigned subframe_bps,
3836         FLAC__Subframe *subframe
3837 )
3838 {
3839         unsigned estimate;
3840
3841         subframe->type = FLAC__SUBFRAME_TYPE_VERBATIM;
3842
3843         subframe->data.verbatim.data = signal;
3844
3845         estimate = FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + subframe->wasted_bits + (blocksize * subframe_bps);
3846
3847 #if SPOTCHECK_ESTIMATE
3848         spotcheck_subframe_estimate_(encoder, blocksize, subframe_bps, subframe, estimate);
3849 #else
3850         (void)encoder;
3851 #endif
3852
3853         return estimate;
3854 }
3855
3856 unsigned find_best_partition_order_(
3857         FLAC__StreamEncoderPrivate *private_,
3858         const FLAC__int32 residual[],
3859         FLAC__uint64 abs_residual_partition_sums[],
3860         unsigned raw_bits_per_partition[],
3861         unsigned residual_samples,
3862         unsigned predictor_order,
3863         unsigned rice_parameter,
3864         unsigned min_partition_order,
3865         unsigned max_partition_order,
3866         FLAC__bool do_escape_coding,
3867         unsigned rice_parameter_search_dist,
3868         FLAC__EntropyCodingMethod_PartitionedRice *best_partitioned_rice
3869 )
3870 {
3871         unsigned residual_bits, best_residual_bits = 0;
3872         unsigned best_parameters_index = 0;
3873         const unsigned blocksize = residual_samples + predictor_order;
3874
3875         max_partition_order = FLAC__format_get_max_rice_partition_order_from_blocksize_limited_max_and_predictor_order(max_partition_order, blocksize, predictor_order);
3876         min_partition_order = min(min_partition_order, max_partition_order);
3877
3878         precompute_partition_info_sums_(residual, abs_residual_partition_sums, residual_samples, predictor_order, min_partition_order, max_partition_order);
3879
3880         if(do_escape_coding)
3881                 precompute_partition_info_escapes_(residual, raw_bits_per_partition, residual_samples, predictor_order, min_partition_order, max_partition_order);
3882
3883         {
3884                 int partition_order;
3885                 unsigned sum;
3886
3887                 for(partition_order = (int)max_partition_order, sum = 0; partition_order >= (int)min_partition_order; partition_order--) {
3888                         if(!
3889                                 set_partitioned_rice_(
3890 #ifdef EXACT_RICE_BITS_CALCULATION
3891                                         residual,
3892 #endif
3893                                         abs_residual_partition_sums+sum,
3894                                         raw_bits_per_partition+sum,
3895                                         residual_samples,
3896                                         predictor_order,
3897                                         rice_parameter,
3898                                         rice_parameter_search_dist,
3899                                         (unsigned)partition_order,
3900                                         do_escape_coding,
3901                                         &private_->partitioned_rice_contents_extra[!best_parameters_index],
3902                                         &residual_bits
3903                                 )
3904                         )
3905                         {
3906                                 FLAC__ASSERT(best_residual_bits != 0);
3907                                 break;
3908                         }
3909                         sum += 1u << partition_order;
3910                         if(best_residual_bits == 0 || residual_bits < best_residual_bits) {
3911                                 best_residual_bits = residual_bits;
3912                                 best_parameters_index = !best_parameters_index;
3913                                 best_partitioned_rice->order = partition_order;
3914                         }
3915                 }
3916         }
3917
3918         /*
3919          * We are allowed to de-const the pointer based on our special knowledge;
3920          * it is const to the outside world.
3921          */
3922         {
3923                 FLAC__EntropyCodingMethod_PartitionedRiceContents* best_partitioned_rice_contents = (FLAC__EntropyCodingMethod_PartitionedRiceContents*)best_partitioned_rice->contents;
3924                 FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(best_partitioned_rice_contents, max(6, best_partitioned_rice->order));
3925                 memcpy(best_partitioned_rice_contents->parameters, private_->partitioned_rice_contents_extra[best_parameters_index].parameters, sizeof(unsigned)*(1<<(best_partitioned_rice->order)));
3926                 memcpy(best_partitioned_rice_contents->raw_bits, private_->partitioned_rice_contents_extra[best_parameters_index].raw_bits, sizeof(unsigned)*(1<<(best_partitioned_rice->order)));
3927         }
3928
3929         return best_residual_bits;
3930 }
3931
3932 void precompute_partition_info_sums_(
3933         const FLAC__int32 residual[],
3934         FLAC__uint64 abs_residual_partition_sums[],
3935         unsigned residual_samples,
3936         unsigned predictor_order,
3937         unsigned min_partition_order,
3938         unsigned max_partition_order
3939 )
3940 {
3941         int partition_order;
3942         unsigned from_partition, to_partition = 0;
3943         const unsigned blocksize = residual_samples + predictor_order;
3944
3945         /* first do max_partition_order */
3946         for(partition_order = (int)max_partition_order; partition_order >= 0; partition_order--) {
3947                 FLAC__uint64 abs_residual_partition_sum; /* OPT: can reasonably be FLAC__uint32 for bps <= 17 and maybe higher */
3948                 unsigned partition, partition_sample, partition_samples, residual_sample;
3949                 const unsigned partitions = 1u << partition_order;
3950                 const unsigned default_partition_samples = blocksize >> partition_order;
3951
3952                 FLAC__ASSERT(default_partition_samples > predictor_order);
3953
3954                 for(partition = residual_sample = 0; partition < partitions; partition++) {
3955                         partition_samples = default_partition_samples;
3956                         if(partition == 0)
3957                                 partition_samples -= predictor_order;
3958                         abs_residual_partition_sum = 0;
3959                         for(partition_sample = 0; partition_sample < partition_samples; partition_sample++, residual_sample++) {
3960 #if defined _MSC_VER && _MSC_VER <= 1200
3961                                 /* OPT: abs() may be faster for some compilers */
3962                                 abs_residual_partition_sum += abs(residual[residual_sample]); /* abs(INT_MIN) is undefined, but if the residual is INT_MIN we have bigger problems */
3963 #else
3964                                 const FLAC__int32 r = residual[residual_sample];
3965                                 if(r < 0)
3966                                         abs_residual_partition_sum -= r;
3967                                 else
3968                                         abs_residual_partition_sum += r;
3969 #endif
3970                         }
3971                         abs_residual_partition_sums[partition] = abs_residual_partition_sum;
3972                 }
3973                 to_partition = partitions;
3974                 break;
3975         }
3976
3977         /* now merge partitions for lower orders */
3978         for(from_partition = 0, --partition_order; partition_order >= (int)min_partition_order; partition_order--) {
3979                 FLAC__uint64 s;
3980                 unsigned i;
3981                 const unsigned partitions = 1u << partition_order;
3982                 for(i = 0; i < partitions; i++) {
3983                         s = abs_residual_partition_sums[from_partition];
3984                         from_partition++;
3985                         abs_residual_partition_sums[to_partition] = s + abs_residual_partition_sums[from_partition];
3986                         from_partition++;
3987                         to_partition++;
3988                 }
3989         }
3990 }
3991
3992 void precompute_partition_info_escapes_(
3993         const FLAC__int32 residual[],
3994         unsigned raw_bits_per_partition[],
3995         unsigned residual_samples,
3996         unsigned predictor_order,
3997         unsigned min_partition_order,
3998         unsigned max_partition_order
3999 )
4000 {
4001         int partition_order;
4002         unsigned from_partition, to_partition = 0;
4003         const unsigned blocksize = residual_samples + predictor_order;
4004
4005         /* first do max_partition_order */
4006         for(partition_order = (int)max_partition_order; partition_order >= 0; partition_order--) {
4007                 FLAC__int32 r, residual_partition_min, residual_partition_max;
4008                 unsigned silog2_min, silog2_max;
4009                 unsigned partition, partition_sample, partition_samples, residual_sample;
4010                 const unsigned partitions = 1u << partition_order;
4011                 const unsigned default_partition_samples = blocksize >> partition_order;
4012
4013                 FLAC__ASSERT(default_partition_samples > predictor_order);
4014
4015                 for(partition = residual_sample = 0; partition < partitions; partition++) {
4016                         partition_samples = default_partition_samples;
4017                         if(partition == 0)
4018                                 partition_samples -= predictor_order;
4019                         residual_partition_min = residual_partition_max = 0;
4020                         for(partition_sample = 0; partition_sample < partition_samples; partition_sample++) {
4021                                 r = residual[residual_sample];
4022                                 if(r < residual_partition_min)
4023                                         residual_partition_min = r;
4024                                 else if(r > residual_partition_max)
4025                                         residual_partition_max = r;
4026                                 residual_sample++;
4027                         }
4028                         silog2_min = FLAC__bitmath_silog2(residual_partition_min);
4029                         silog2_max = FLAC__bitmath_silog2(residual_partition_max);
4030                         raw_bits_per_partition[partition] = max(silog2_min, silog2_max);
4031                 }
4032                 to_partition = partitions;
4033                 break; /*@@@ yuck, should remove the 'for' loop instead */
4034         }
4035
4036         /* now merge partitions for lower orders */
4037         for(from_partition = 0, --partition_order; partition_order >= (int)min_partition_order; partition_order--) {
4038                 unsigned m;
4039                 unsigned i;
4040                 const unsigned partitions = 1u << partition_order;
4041                 for(i = 0; i < partitions; i++) {
4042                         m = raw_bits_per_partition[from_partition];
4043                         from_partition++;
4044                         raw_bits_per_partition[to_partition] = max(m, raw_bits_per_partition[from_partition]);
4045                         from_partition++;
4046                         to_partition++;
4047                 }
4048         }
4049 }
4050
4051 /*@@@@@@ overflow is a possible problem here for hi-res samples */
4052 #ifdef EXACT_RICE_BITS_CALCULATION
4053 static __inline unsigned count_rice_bits_in_partition_(
4054         const unsigned rice_parameter,
4055         const unsigned partition_samples,
4056         const FLAC__int32 *residual
4057 )
4058 {
4059         unsigned i, partition_bits =
4060                 FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN +
4061                 (1+rice_parameter) * partition_samples /* 1 for unary stop bit + rice_parameter for the binary portion */
4062         ;
4063         for(i = 0; i < partition_samples; i++)
4064                 partition_bits += ( (FLAC__uint32)((residual[i]<<1)^(residual[i]>>31)) >> rice_parameter );
4065         return partition_bits;
4066 }
4067 #else
4068 static __inline unsigned count_rice_bits_in_partition_(
4069         const unsigned rice_parameter,
4070         const unsigned partition_samples,
4071         const FLAC__uint64 abs_residual_partition_sum
4072 )
4073 {
4074         return
4075                 FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN +
4076                 (1+rice_parameter) * partition_samples + /* 1 for unary stop bit + rice_parameter for the binary portion */
4077                 (
4078                         rice_parameter?
4079                                 (unsigned)(abs_residual_partition_sum >> (rice_parameter-1)) /* rice_parameter-1 because the real coder sign-folds instead of using a sign bit */
4080                                 : (unsigned)(abs_residual_partition_sum << 1) /* can't shift by negative number, so reverse */
4081                 )
4082                 - (partition_samples >> 1)
4083                 /* -(partition_samples>>1) to subtract out extra contributions to the abs_residual_partition_sum.
4084                  * The actual number of bits used is closer to the sum for all i in the partition of  abs(residual[i])>>(rice_parameter-1)
4085                  * By using the abs_residual_partition sum, we also add in bits in the LSBs that would normally be shifted out.
4086                  * So the subtraction term tries to guess how many extra bits were contributed.
4087                  * If the LSBs are randomly distributed, this should average to 0.5 extra bits per sample.
4088                  */
4089         ;
4090 }
4091 #endif
4092
4093 FLAC__bool set_partitioned_rice_(
4094 #ifdef EXACT_RICE_BITS_CALCULATION
4095         const FLAC__int32 residual[],
4096 #endif
4097         const FLAC__uint64 abs_residual_partition_sums[],
4098         const unsigned raw_bits_per_partition[],
4099         const unsigned residual_samples,
4100         const unsigned predictor_order,
4101         const unsigned suggested_rice_parameter,
4102         const unsigned rice_parameter_search_dist,
4103         const unsigned partition_order,
4104         const FLAC__bool search_for_escapes,
4105         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents,
4106         unsigned *bits
4107 )
4108 {
4109         unsigned rice_parameter, partition_bits;
4110         unsigned best_partition_bits, best_rice_parameter = 0;
4111         unsigned flat_bits;
4112         unsigned bits_ = FLAC__ENTROPY_CODING_METHOD_TYPE_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN;
4113         unsigned *parameters, *raw_bits;
4114 #ifdef ENABLE_RICE_PARAMETER_SEARCH
4115         unsigned min_rice_parameter, max_rice_parameter;
4116 #else
4117         (void)rice_parameter_search_dist;
4118 #endif
4119
4120         FLAC__ASSERT(suggested_rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER);
4121
4122         FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(partitioned_rice_contents, max(6, partition_order));
4123         parameters = partitioned_rice_contents->parameters;
4124         raw_bits = partitioned_rice_contents->raw_bits;
4125
4126         if(partition_order == 0) {
4127                 best_partition_bits = 0xffffffff;
4128 #ifdef ENABLE_RICE_PARAMETER_SEARCH
4129                 if(rice_parameter_search_dist) {
4130                         if(suggested_rice_parameter < rice_parameter_search_dist)
4131                                 min_rice_parameter = 0;
4132                         else
4133                                 min_rice_parameter = suggested_rice_parameter - rice_parameter_search_dist;
4134                         max_rice_parameter = suggested_rice_parameter + rice_parameter_search_dist;
4135                         if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
4136 #ifdef DEBUG_VERBOSE
4137                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @5\n", max_rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
4138 #endif
4139                                 max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
4140                         }
4141                 }
4142                 else
4143                         min_rice_parameter = max_rice_parameter = suggested_rice_parameter;
4144
4145                 for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
4146 #else
4147                         rice_parameter = suggested_rice_parameter;
4148 #endif
4149 #ifdef EXACT_RICE_BITS_CALCULATION
4150                         partition_bits = count_rice_bits_in_partition_(rice_parameter, residual_samples, residual);
4151 #else
4152                         partition_bits = count_rice_bits_in_partition_(rice_parameter, residual_samples, abs_residual_partition_sums[0]);
4153 #endif
4154                         if(partition_bits < best_partition_bits) {
4155                                 best_rice_parameter = rice_parameter;
4156                                 best_partition_bits = partition_bits;
4157                         }
4158 #ifdef ENABLE_RICE_PARAMETER_SEARCH
4159                 }
4160 #endif
4161                 if(search_for_escapes) {
4162                         flat_bits = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN + raw_bits_per_partition[0] * residual_samples;
4163                         if(flat_bits <= best_partition_bits) {
4164                                 raw_bits[0] = raw_bits_per_partition[0];
4165                                 best_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
4166                                 best_partition_bits = flat_bits;
4167                         }
4168                 }
4169                 parameters[0] = best_rice_parameter;
4170                 bits_ += best_partition_bits;
4171         }
4172         else {
4173                 unsigned partition, residual_sample;
4174                 unsigned partition_samples;
4175                 FLAC__uint64 mean, k;
4176                 const unsigned partitions = 1u << partition_order;
4177                 for(partition = residual_sample = 0; partition < partitions; partition++) {
4178                         partition_samples = (residual_samples+predictor_order) >> partition_order;
4179                         if(partition == 0) {
4180                                 if(partition_samples <= predictor_order)
4181                                         return false;
4182                                 else
4183                                         partition_samples -= predictor_order;
4184                         }
4185                         mean = abs_residual_partition_sums[partition];
4186                         /* we are basically calculating the size in bits of the
4187                          * average residual magnitude in the partition:
4188                          *   rice_parameter = floor(log2(mean/partition_samples))
4189                          * 'mean' is not a good name for the variable, it is
4190                          * actually the sum of magnitudes of all residual values
4191                          * in the partition, so the actual mean is
4192                          * mean/partition_samples
4193                          */
4194                         for(rice_parameter = 0, k = partition_samples; k < mean; rice_parameter++, k <<= 1)
4195                                 ;
4196                         if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
4197 #ifdef DEBUG_VERBOSE
4198                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @6\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
4199 #endif
4200                                 rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
4201                         }
4202
4203                         best_partition_bits = 0xffffffff;
4204 #ifdef ENABLE_RICE_PARAMETER_SEARCH
4205                         if(rice_parameter_search_dist) {
4206                                 if(rice_parameter < rice_parameter_search_dist)
4207                                         min_rice_parameter = 0;
4208                                 else
4209                                         min_rice_parameter = rice_parameter - rice_parameter_search_dist;
4210                                 max_rice_parameter = rice_parameter + rice_parameter_search_dist;
4211                                 if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
4212 #ifdef DEBUG_VERBOSE
4213                                         fprintf(stderr, "clipping rice_parameter (%u -> %u) @7\n", max_rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
4214 #endif
4215                                         max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
4216                                 }
4217                         }
4218                         else
4219                                 min_rice_parameter = max_rice_parameter = rice_parameter;
4220
4221                         for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
4222 #endif
4223 #ifdef EXACT_RICE_BITS_CALCULATION
4224                                 partition_bits = count_rice_bits_in_partition_(rice_parameter, partition_samples, residual+residual_sample);
4225 #else
4226                                 partition_bits = count_rice_bits_in_partition_(rice_parameter, partition_samples, abs_residual_partition_sums[partition]);
4227 #endif
4228                                 if(partition_bits < best_partition_bits) {
4229                                         best_rice_parameter = rice_parameter;
4230                                         best_partition_bits = partition_bits;
4231                                 }
4232 #ifdef ENABLE_RICE_PARAMETER_SEARCH
4233                         }
4234 #endif
4235                         if(search_for_escapes) {
4236                                 flat_bits = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN + raw_bits_per_partition[partition] * partition_samples;
4237                                 if(flat_bits <= best_partition_bits) {
4238                                         raw_bits[partition] = raw_bits_per_partition[partition];
4239                                         best_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
4240                                         best_partition_bits = flat_bits;
4241                                 }
4242                         }
4243                         parameters[partition] = best_rice_parameter;
4244                         bits_ += best_partition_bits;
4245                         residual_sample += partition_samples;
4246                 }
4247         }
4248
4249         *bits = bits_;
4250         return true;
4251 }
4252
4253 unsigned get_wasted_bits_(FLAC__int32 signal[], unsigned samples)
4254 {
4255         unsigned i, shift;
4256         FLAC__int32 x = 0;
4257
4258         for(i = 0; i < samples && !(x&1); i++)
4259                 x |= signal[i];
4260
4261         if(x == 0) {
4262                 shift = 0;
4263         }
4264         else {
4265                 for(shift = 0; !(x&1); shift++)
4266                         x >>= 1;
4267         }
4268
4269         if(shift > 0) {
4270                 for(i = 0; i < samples; i++)
4271                          signal[i] >>= shift;
4272         }
4273
4274         return shift;
4275 }
4276
4277 void append_to_verify_fifo_(verify_input_fifo *fifo, const FLAC__int32 * const input[], unsigned input_offset, unsigned channels, unsigned wide_samples)
4278 {
4279         unsigned channel;
4280
4281         for(channel = 0; channel < channels; channel++)
4282                 memcpy(&fifo->data[channel][fifo->tail], &input[channel][input_offset], sizeof(FLAC__int32) * wide_samples);
4283
4284         fifo->tail += wide_samples;
4285
4286         FLAC__ASSERT(fifo->tail <= fifo->size);
4287 }
4288
4289 void append_to_verify_fifo_interleaved_(verify_input_fifo *fifo, const FLAC__int32 input[], unsigned input_offset, unsigned channels, unsigned wide_samples)
4290 {
4291         unsigned channel;
4292         unsigned sample, wide_sample;
4293         unsigned tail = fifo->tail;
4294
4295         sample = input_offset * channels;
4296         for(wide_sample = 0; wide_sample < wide_samples; wide_sample++) {
4297                 for(channel = 0; channel < channels; channel++)
4298                         fifo->data[channel][tail] = input[sample++];
4299                 tail++;
4300         }
4301         fifo->tail = tail;
4302
4303         FLAC__ASSERT(fifo->tail <= fifo->size);
4304 }
4305
4306 FLAC__StreamDecoderReadStatus verify_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
4307 {
4308         FLAC__StreamEncoder *encoder = (FLAC__StreamEncoder*)client_data;
4309         const size_t encoded_bytes = encoder->private_->verify.output.bytes;
4310         (void)decoder;
4311
4312         if(encoder->private_->verify.needs_magic_hack) {
4313                 FLAC__ASSERT(*bytes >= FLAC__STREAM_SYNC_LENGTH);
4314                 *bytes = FLAC__STREAM_SYNC_LENGTH;
4315                 memcpy(buffer, FLAC__STREAM_SYNC_STRING, *bytes);
4316                 encoder->private_->verify.needs_magic_hack = false;
4317         }
4318         else {
4319                 if(encoded_bytes == 0) {
4320                         /*
4321                          * If we get here, a FIFO underflow has occurred,
4322                          * which means there is a bug somewhere.
4323                          */
4324                         FLAC__ASSERT(0);
4325                         return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
4326                 }
4327                 else if(encoded_bytes < *bytes)
4328                         *bytes = encoded_bytes;
4329                 memcpy(buffer, encoder->private_->verify.output.data, *bytes);
4330                 encoder->private_->verify.output.data += *bytes;
4331                 encoder->private_->verify.output.bytes -= *bytes;
4332         }
4333
4334         return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
4335 }
4336
4337 FLAC__StreamDecoderWriteStatus verify_write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
4338 {
4339         FLAC__StreamEncoder *encoder = (FLAC__StreamEncoder *)client_data;
4340         unsigned channel;
4341         const unsigned channels = frame->header.channels;
4342         const unsigned blocksize = frame->header.blocksize;
4343         const unsigned bytes_per_block = sizeof(FLAC__int32) * blocksize;
4344
4345         (void)decoder;
4346
4347         for(channel = 0; channel < channels; channel++) {
4348                 if(0 != memcmp(buffer[channel], encoder->private_->verify.input_fifo.data[channel], bytes_per_block)) {
4349                         unsigned i, sample = 0;
4350                         FLAC__int32 expect = 0, got = 0;
4351
4352                         for(i = 0; i < blocksize; i++) {
4353                                 if(buffer[channel][i] != encoder->private_->verify.input_fifo.data[channel][i]) {
4354                                         sample = i;
4355                                         expect = (FLAC__int32)encoder->private_->verify.input_fifo.data[channel][i];
4356                                         got = (FLAC__int32)buffer[channel][i];
4357                                         break;
4358                                 }
4359                         }
4360                         FLAC__ASSERT(i < blocksize);
4361                         FLAC__ASSERT(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
4362                         encoder->private_->verify.error_stats.absolute_sample = frame->header.number.sample_number + sample;
4363                         encoder->private_->verify.error_stats.frame_number = (unsigned)(frame->header.number.sample_number / blocksize);
4364                         encoder->private_->verify.error_stats.channel = channel;
4365                         encoder->private_->verify.error_stats.sample = sample;
4366                         encoder->private_->verify.error_stats.expected = expect;
4367                         encoder->private_->verify.error_stats.got = got;
4368                         encoder->protected_->state = FLAC__STREAM_ENCODER_VERIFY_MISMATCH_IN_AUDIO_DATA;
4369                         return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
4370                 }
4371         }
4372         /* dequeue the frame from the fifo */
4373         encoder->private_->verify.input_fifo.tail -= blocksize;
4374         FLAC__ASSERT(encoder->private_->verify.input_fifo.tail <= OVERREAD_);
4375         for(channel = 0; channel < channels; channel++)
4376                 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]));
4377         return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
4378 }
4379
4380 void verify_metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
4381 {
4382         (void)decoder, (void)metadata, (void)client_data;
4383 }
4384
4385 void verify_error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
4386 {
4387         FLAC__StreamEncoder *encoder = (FLAC__StreamEncoder*)client_data;
4388         (void)decoder, (void)status;
4389         encoder->protected_->state = FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR;
4390 }
4391
4392 FLAC__StreamEncoderReadStatus file_read_callback_(const FLAC__StreamEncoder *encoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
4393 {
4394         (void)client_data;
4395
4396         *bytes = fread(buffer, 1, *bytes, encoder->private_->file);
4397         if (*bytes == 0) {
4398                 if (feof(encoder->private_->file))
4399                         return FLAC__STREAM_ENCODER_READ_STATUS_END_OF_STREAM;
4400                 else if (ferror(encoder->private_->file))
4401                         return FLAC__STREAM_ENCODER_READ_STATUS_ABORT;
4402         }
4403         return FLAC__STREAM_ENCODER_READ_STATUS_CONTINUE;
4404 }
4405
4406 FLAC__StreamEncoderSeekStatus file_seek_callback_(const FLAC__StreamEncoder *encoder, FLAC__uint64 absolute_byte_offset, void *client_data)
4407 {
4408         (void)client_data;
4409
4410         if(fseeko(encoder->private_->file, (off_t)absolute_byte_offset, SEEK_SET) < 0)
4411                 return FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR;
4412         else
4413                 return FLAC__STREAM_ENCODER_SEEK_STATUS_OK;
4414 }
4415
4416 FLAC__StreamEncoderTellStatus file_tell_callback_(const FLAC__StreamEncoder *encoder, FLAC__uint64 *absolute_byte_offset, void *client_data)
4417 {
4418         off_t offset;
4419
4420         (void)client_data;
4421
4422         offset = ftello(encoder->private_->file);
4423
4424         if(offset < 0) {
4425                 return FLAC__STREAM_ENCODER_TELL_STATUS_ERROR;
4426         }
4427         else {
4428                 *absolute_byte_offset = (FLAC__uint64)offset;
4429                 return FLAC__STREAM_ENCODER_TELL_STATUS_OK;
4430         }
4431 }
4432
4433 #ifdef FLAC__VALGRIND_TESTING
4434 static size_t local__fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)
4435 {
4436         size_t ret = fwrite(ptr, size, nmemb, stream);
4437         if(!ferror(stream))
4438                 fflush(stream);
4439         return ret;
4440 }
4441 #else
4442 #define local__fwrite fwrite
4443 #endif
4444
4445 FLAC__StreamEncoderWriteStatus file_write_callback_(const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], size_t bytes, unsigned samples, unsigned current_frame, void *client_data)
4446 {
4447         (void)client_data, (void)current_frame;
4448
4449         if(local__fwrite(buffer, sizeof(FLAC__byte), bytes, encoder->private_->file) == bytes) {
4450                 FLAC__bool call_it = 0 != encoder->private_->progress_callback && (
4451 #if FLAC__HAS_OGG
4452                         /* We would like to be able to use 'samples > 0' in the
4453                          * clause here but currently because of the nature of our
4454                          * Ogg writing implementation, 'samples' is always 0 (see
4455                          * ogg_encoder_aspect.c).  The downside is extra progress
4456                          * callbacks.
4457                          */
4458                         encoder->private_->is_ogg? true :
4459 #endif
4460                         samples > 0
4461                 );
4462                 if(call_it) {
4463                         /* NOTE: We have to add +bytes, +samples, and +1 to the stats
4464                          * because at this point in the callback chain, the stats
4465                          * have not been updated.  Only after we return and control
4466                          * gets back to write_frame_() are the stats updated
4467                          */
4468                         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);
4469                 }
4470                 return FLAC__STREAM_ENCODER_WRITE_STATUS_OK;
4471         }
4472         else
4473                 return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;
4474 }
4475
4476 /*
4477  * This will forcibly set stdout to binary mode (for OSes that require it)
4478  */
4479 FILE *get_binary_stdout_()
4480 {
4481         /* if something breaks here it is probably due to the presence or
4482          * absence of an underscore before the identifiers 'setmode',
4483          * 'fileno', and/or 'O_BINARY'; check your system header files.
4484          */
4485 #if defined _MSC_VER || defined __MINGW32__
4486         _setmode(_fileno(stdout), _O_BINARY);
4487 #elif defined __CYGWIN__
4488         /* almost certainly not needed for any modern Cygwin, but let's be safe... */
4489         setmode(_fileno(stdout), _O_BINARY);
4490 #elif defined __EMX__
4491         setmode(fileno(stdout), O_BINARY);
4492 #endif
4493
4494         return stdout;
4495 }