src/libFLAC/stream_encoder.c

   1 /* libFLAC - Free Lossless Audio Codec library
   2  * Copyright (C) 2000,2001,2002  Josh Coalson
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA  02111-1307, USA.
  18  */
  19
  20 #include <limits.h>
  21 #include <stdio.h>
  22 #include <stdlib.h> /* for malloc() */
  23 #include <string.h> /* for memcpy() */
  24 #include "FLAC/assert.h"
  25 #include "FLAC/stream_decoder.h"
  26 #include "protected/stream_encoder.h"
  27 #include "private/bitbuffer.h"
  28 #include "private/bitmath.h"
  29 #include "private/crc.h"
  30 #include "private/cpu.h"
  31 #include "private/fixed.h"
  32 #include "private/format.h"
  33 #include "private/lpc.h"
  34 #include "private/md5.h"
  35 #include "private/memory.h"
  36 #include "private/stream_encoder_framing.h"
  37
  38 #ifdef min
  39 #undef min
  40 #endif
  41 #define min(x,y) ((x)<(y)?(x):(y))
  42
  43 #ifdef max
  44 #undef max
  45 #endif
  46 #define max(x,y) ((x)>(y)?(x):(y))
  47
  48 typedef struct {
  49         FLAC__int32 *data[FLAC__MAX_CHANNELS];
  50         unsigned size; /* of each data[] in samples */
  51         unsigned tail;
  52 } verify_input_fifo;
  53
  54 typedef struct {
  55         const FLAC__byte *data;
  56         unsigned capacity;
  57         unsigned bytes;
  58 } verify_output;
  59
  60 typedef enum {
  61         ENCODER_IN_MAGIC = 0,
  62         ENCODER_IN_METADATA = 1,
  63         ENCODER_IN_AUDIO = 2
  64 } EncoderStateHint;
  65
  66 /***********************************************************************
  67  *
  68  * Private class method prototypes
  69  *
  70  ***********************************************************************/
  71
  72 static void set_defaults_(FLAC__StreamEncoder *encoder);
  73 static void free_(FLAC__StreamEncoder *encoder);
  74 static FLAC__bool resize_buffers_(FLAC__StreamEncoder *encoder, unsigned new_size);
  75 static FLAC__bool write_bitbuffer_(FLAC__StreamEncoder *encoder, unsigned samples);
  76 static FLAC__bool process_frame_(FLAC__StreamEncoder *encoder, FLAC__bool is_last_frame);
  77 static FLAC__bool process_subframes_(FLAC__StreamEncoder *encoder, FLAC__bool is_last_frame);
  78
  79 static FLAC__bool process_subframe_(
  80         FLAC__StreamEncoder *encoder,
  81         unsigned min_partition_order,
  82         unsigned max_partition_order,
  83         FLAC__bool precompute_partition_sums,
  84         const FLAC__FrameHeader *frame_header,
  85         unsigned subframe_bps,
  86         const FLAC__int32 integer_signal[],
  87         const FLAC__real real_signal[],
  88         FLAC__Subframe *subframe[2],
  89         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents[2],
  90         FLAC__int32 *residual[2],
  91         unsigned *best_subframe,
  92         unsigned *best_bits
  93 );
  94
  95 static FLAC__bool add_subframe_(
  96         FLAC__StreamEncoder *encoder,
  97         const FLAC__FrameHeader *frame_header,
  98         unsigned subframe_bps,
  99         const FLAC__Subframe *subframe,
 100         FLAC__BitBuffer *frame
 101 );
 102
 103 static unsigned evaluate_constant_subframe_(
 104         const FLAC__int32 signal,
 105         unsigned subframe_bps,
 106         FLAC__Subframe *subframe
 107 );
 108
 109 static unsigned evaluate_fixed_subframe_(
 110         FLAC__StreamEncoder *encoder,
 111         const FLAC__int32 signal[],
 112         FLAC__int32 residual[],
 113         FLAC__uint32 abs_residual[],
 114         FLAC__uint64 abs_residual_partition_sums[],
 115         unsigned raw_bits_per_partition[],
 116         unsigned blocksize,
 117         unsigned subframe_bps,
 118         unsigned order,
 119         unsigned rice_parameter,
 120         unsigned min_partition_order,
 121         unsigned max_partition_order,
 122         FLAC__bool precompute_partition_sums,
 123         FLAC__bool do_escape_coding,
 124         unsigned rice_parameter_search_dist,
 125         FLAC__Subframe *subframe,
 126         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents
 127 );
 128
 129 static unsigned evaluate_lpc_subframe_(
 130         FLAC__StreamEncoder *encoder,
 131         const FLAC__int32 signal[],
 132         FLAC__int32 residual[],
 133         FLAC__uint32 abs_residual[],
 134         FLAC__uint64 abs_residual_partition_sums[],
 135         unsigned raw_bits_per_partition[],
 136         const FLAC__real lp_coeff[],
 137         unsigned blocksize,
 138         unsigned subframe_bps,
 139         unsigned order,
 140         unsigned qlp_coeff_precision,
 141         unsigned rice_parameter,
 142         unsigned min_partition_order,
 143         unsigned max_partition_order,
 144         FLAC__bool precompute_partition_sums,
 145         FLAC__bool do_escape_coding,
 146         unsigned rice_parameter_search_dist,
 147         FLAC__Subframe *subframe,
 148         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents
 149 );
 150
 151 static unsigned evaluate_verbatim_subframe_(
 152         const FLAC__int32 signal[],
 153         unsigned blocksize,
 154         unsigned subframe_bps,
 155         FLAC__Subframe *subframe
 156 );
 157
 158 static unsigned find_best_partition_order_(
 159         struct FLAC__StreamEncoderPrivate *private_,
 160         const FLAC__int32 residual[],
 161         FLAC__uint32 abs_residual[],
 162         FLAC__uint64 abs_residual_partition_sums[],
 163         unsigned raw_bits_per_partition[],
 164         unsigned residual_samples,
 165         unsigned predictor_order,
 166         unsigned rice_parameter,
 167         unsigned min_partition_order,
 168         unsigned max_partition_order,
 169         FLAC__bool precompute_partition_sums,
 170         FLAC__bool do_escape_coding,
 171         unsigned rice_parameter_search_dist,
 172         FLAC__EntropyCodingMethod_PartitionedRice *best_partitioned_rice
 173 );
 174
 175 static void precompute_partition_info_sums_(
 176         const FLAC__uint32 abs_residual[],
 177         FLAC__uint64 abs_residual_partition_sums[],
 178         unsigned residual_samples,
 179         unsigned predictor_order,
 180         unsigned min_partition_order,
 181         unsigned max_partition_order
 182 );
 183
 184 static void precompute_partition_info_escapes_(
 185         const FLAC__int32 residual[],
 186         unsigned raw_bits_per_partition[],
 187         unsigned residual_samples,
 188         unsigned predictor_order,
 189         unsigned min_partition_order,
 190         unsigned max_partition_order
 191 );
 192
 193 #ifdef DONT_ESTIMATE_RICE_BITS
 194 static FLAC__bool set_partitioned_rice_(
 195         const FLAC__uint32 abs_residual[],
 196         const FLAC__int32 residual[],
 197         const unsigned residual_samples,
 198         const unsigned predictor_order,
 199         const unsigned suggested_rice_parameter,
 200         const unsigned rice_parameter_search_dist,
 201         const unsigned partition_order,
 202         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents,
 203         unsigned *bits
 204 );
 205
 206 static FLAC__bool set_partitioned_rice_with_precompute_(
 207         const FLAC__int32 residual[],
 208         const FLAC__uint64 abs_residual_partition_sums[],
 209         const unsigned raw_bits_per_partition[],
 210         const unsigned residual_samples,
 211         const unsigned predictor_order,
 212         const unsigned suggested_rice_parameter,
 213         const unsigned rice_parameter_search_dist,
 214         const unsigned partition_order,
 215         const FLAC__bool search_for_escapes,
 216         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents,
 217         unsigned *bits
 218 );
 219 #else
 220 static FLAC__bool set_partitioned_rice_(
 221         const FLAC__uint32 abs_residual[],
 222         const unsigned residual_samples,
 223         const unsigned predictor_order,
 224         const unsigned suggested_rice_parameter,
 225         const unsigned rice_parameter_search_dist,
 226         const unsigned partition_order,
 227         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents,
 228         unsigned *bits
 229 );
 230
 231 static FLAC__bool set_partitioned_rice_with_precompute_(
 232         const FLAC__uint32 abs_residual[],
 233         const FLAC__uint64 abs_residual_partition_sums[],
 234         const unsigned raw_bits_per_partition[],
 235         const unsigned residual_samples,
 236         const unsigned predictor_order,
 237         const unsigned suggested_rice_parameter,
 238         const unsigned rice_parameter_search_dist,
 239         const unsigned partition_order,
 240         const FLAC__bool search_for_escapes,
 241         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents,
 242         unsigned *bits
 243 );
 244 #endif
 245
 246 static unsigned get_wasted_bits_(FLAC__int32 signal[], unsigned samples);
 247
 248 /* verify-related routines: */
 249 static void append_to_verify_fifo_(
 250         verify_input_fifo *fifo,
 251         const FLAC__int32 * const input[],
 252         unsigned input_offset,
 253         unsigned channels,
 254         unsigned wide_samples
 255 );
 256
 257 static void append_to_verify_fifo_interleaved_(
 258         verify_input_fifo *fifo,
 259         const FLAC__int32 input[],
 260         unsigned input_offset,
 261         unsigned channels,
 262         unsigned wide_samples
 263 );
 264
 265 static FLAC__StreamDecoderReadStatus verify_read_callback_(
 266         const FLAC__StreamDecoder *decoder,
 267         FLAC__byte buffer[],
 268         unsigned *bytes,
 269         void *client_data
 270 );
 271
 272 static FLAC__StreamDecoderWriteStatus verify_write_callback_(
 273         const FLAC__StreamDecoder *decoder,
 274         const FLAC__Frame *frame,
 275         const FLAC__int32 * const buffer[],
 276         void *client_data
 277 );
 278
 279 static void verify_metadata_callback_(
 280         const FLAC__StreamDecoder *decoder,
 281         const FLAC__StreamMetadata *metadata,
 282         void *client_data
 283 );
 284
 285 static void verify_error_callback_(
 286         const FLAC__StreamDecoder *decoder,
 287         FLAC__StreamDecoderErrorStatus status,
 288         void *client_data
 289 );
 290
 291
 292 /***********************************************************************
 293  *
 294  * Private class data
 295  *
 296  ***********************************************************************/
 297
 298 typedef struct FLAC__StreamEncoderPrivate {
 299         unsigned input_capacity;                          /* current size (in samples) of the signal and residual buffers */
 300         FLAC__int32 *integer_signal[FLAC__MAX_CHANNELS];  /* the integer version of the input signal */
 301         FLAC__int32 *integer_signal_mid_side[2];          /* the integer version of the mid-side input signal (stereo only) */
 302         FLAC__real *real_signal[FLAC__MAX_CHANNELS];      /* the floating-point version of the input signal */
 303         FLAC__real *real_signal_mid_side[2];              /* the floating-point version of the mid-side input signal (stereo only) */
 304         unsigned subframe_bps[FLAC__MAX_CHANNELS];        /* the effective bits per sample of the input signal (stream bps - wasted bits) */
 305         unsigned subframe_bps_mid_side[2];                /* the effective bits per sample of the mid-side input signal (stream bps - wasted bits + 0/1) */
 306         FLAC__int32 *residual_workspace[FLAC__MAX_CHANNELS][2]; /* each channel has a candidate and best workspace where the subframe residual signals will be stored */
 307         FLAC__int32 *residual_workspace_mid_side[2][2];
 308         FLAC__Subframe subframe_workspace[FLAC__MAX_CHANNELS][2];
 309         FLAC__Subframe subframe_workspace_mid_side[2][2];
 310         FLAC__Subframe *subframe_workspace_ptr[FLAC__MAX_CHANNELS][2];
 311         FLAC__Subframe *subframe_workspace_ptr_mid_side[2][2];
 312         FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents_workspace[FLAC__MAX_CHANNELS][2];
 313         FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents_workspace_mid_side[FLAC__MAX_CHANNELS][2];
 314         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents_workspace_ptr[FLAC__MAX_CHANNELS][2];
 315         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents_workspace_ptr_mid_side[FLAC__MAX_CHANNELS][2];
 316         unsigned best_subframe[FLAC__MAX_CHANNELS];       /* index into the above workspaces */
 317         unsigned best_subframe_mid_side[2];
 318         unsigned best_subframe_bits[FLAC__MAX_CHANNELS];  /* size in bits of the best subframe for each channel */
 319         unsigned best_subframe_bits_mid_side[2];
 320         FLAC__uint32 *abs_residual;                       /* workspace where abs(candidate residual) is stored */
 321         FLAC__uint64 *abs_residual_partition_sums;        /* workspace where the sum of abs(candidate residual) for each partition is stored */
 322         unsigned *raw_bits_per_partition;                 /* workspace where the sum of silog2(candidate residual) for each partition is stored */
 323         FLAC__BitBuffer *frame;                           /* the current frame being worked on */
 324         double loose_mid_side_stereo_frames_exact;        /* exact number of frames the encoder will use before trying both independent and mid/side frames again */
 325         unsigned loose_mid_side_stereo_frames;            /* rounded number of frames the encoder will use before trying both independent and mid/side frames again */
 326         unsigned loose_mid_side_stereo_frame_count;       /* number of frames using the current channel assignment */
 327         FLAC__ChannelAssignment last_channel_assignment;
 328         FLAC__StreamMetadata metadata;
 329         unsigned current_sample_number;
 330         unsigned current_frame_number;
 331         struct MD5Context md5context;
 332         FLAC__CPUInfo cpuinfo;
 333         unsigned (*local_fixed_compute_best_predictor)(const FLAC__int32 data[], unsigned data_len, FLAC__real residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]);
 334         void (*local_lpc_compute_autocorrelation)(const FLAC__real data[], unsigned data_len, unsigned lag, FLAC__real autoc[]);
 335         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[]);
 336         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[]);
 337         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[]);
 338         FLAC__bool use_wide_by_block;          /* use slow 64-bit versions of some functions because of the block size */
 339         FLAC__bool use_wide_by_partition;      /* use slow 64-bit versions of some functions because of the min partition order and blocksize */
 340         FLAC__bool use_wide_by_order;          /* use slow 64-bit versions of some functions because of the lpc order */
 341         FLAC__bool precompute_partition_sums;  /* our initial guess as to whether precomputing the partitions sums will be a speed improvement */
 342         FLAC__bool disable_constant_subframes;
 343         FLAC__bool disable_fixed_subframes;
 344         FLAC__bool disable_verbatim_subframes;
 345         FLAC__StreamEncoderWriteCallback write_callback;
 346         FLAC__StreamEncoderMetadataCallback metadata_callback;
 347         void *client_data;
 348         /* unaligned (original) pointers to allocated data */
 349         FLAC__int32 *integer_signal_unaligned[FLAC__MAX_CHANNELS];
 350         FLAC__int32 *integer_signal_mid_side_unaligned[2];
 351         FLAC__real *real_signal_unaligned[FLAC__MAX_CHANNELS];
 352         FLAC__real *real_signal_mid_side_unaligned[2];
 353         FLAC__int32 *residual_workspace_unaligned[FLAC__MAX_CHANNELS][2];
 354         FLAC__int32 *residual_workspace_mid_side_unaligned[2][2];
 355         FLAC__uint32 *abs_residual_unaligned;
 356         FLAC__uint64 *abs_residual_partition_sums_unaligned;
 357         unsigned *raw_bits_per_partition_unaligned;
 358         /*
 359          * These fields have been moved here from private function local
 360          * declarations merely to save stack space during encoding.
 361          */
 362         FLAC__real lp_coeff[FLAC__MAX_LPC_ORDER][FLAC__MAX_LPC_ORDER]; /* from process_subframe_() */
 363         FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents_extra[2]; /* from find_best_partition_order_() */
 364         /*
 365          * The data for the verify section
 366          */
 367         struct {
 368                 FLAC__StreamDecoder *decoder;
 369                 EncoderStateHint state_hint;
 370                 FLAC__bool needs_magic_hack;
 371                 verify_input_fifo input_fifo;
 372                 verify_output output;
 373                 struct {
 374                         FLAC__uint64 absolute_sample;
 375                         unsigned frame_number;
 376                         unsigned channel;
 377                         unsigned sample;
 378                         FLAC__int32 expected;
 379                         FLAC__int32 got;
 380                 } error_stats;
 381         } verify;
 382         FLAC__bool is_being_deleted; /* if true, call to ..._finish() from ..._delete() will not call the callbacks */
 383 } FLAC__StreamEncoderPrivate;
 384
 385 /***********************************************************************
 386  *
 387  * Public static class data
 388  *
 389  ***********************************************************************/
 390
 391 FLAC_API const char * const FLAC__StreamEncoderStateString[] = {
 392         "FLAC__STREAM_ENCODER_OK",
 393         "FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR",
 394         "FLAC__STREAM_ENCODER_VERIFY_MISMATCH_IN_AUDIO_DATA",
 395         "FLAC__STREAM_ENCODER_INVALID_CALLBACK",
 396         "FLAC__STREAM_ENCODER_INVALID_NUMBER_OF_CHANNELS",
 397         "FLAC__STREAM_ENCODER_INVALID_BITS_PER_SAMPLE",
 398         "FLAC__STREAM_ENCODER_INVALID_SAMPLE_RATE",
 399         "FLAC__STREAM_ENCODER_INVALID_BLOCK_SIZE",
 400         "FLAC__STREAM_ENCODER_INVALID_MAX_LPC_ORDER",
 401         "FLAC__STREAM_ENCODER_INVALID_QLP_COEFF_PRECISION",
 402         "FLAC__STREAM_ENCODER_MID_SIDE_CHANNELS_MISMATCH",
 403         "FLAC__STREAM_ENCODER_MID_SIDE_SAMPLE_SIZE_MISMATCH",
 404         "FLAC__STREAM_ENCODER_ILLEGAL_MID_SIDE_FORCE",
 405         "FLAC__STREAM_ENCODER_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER",
 406         "FLAC__STREAM_ENCODER_NOT_STREAMABLE",
 407         "FLAC__STREAM_ENCODER_FRAMING_ERROR",
 408         "FLAC__STREAM_ENCODER_INVALID_METADATA",
 409         "FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING",
 410         "FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_WRITING",
 411         "FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR",
 412         "FLAC__STREAM_ENCODER_ALREADY_INITIALIZED",
 413         "FLAC__STREAM_ENCODER_UNINITIALIZED"
 414 };
 415
 416 FLAC_API const char * const FLAC__StreamEncoderWriteStatusString[] = {
 417         "FLAC__STREAM_ENCODER_WRITE_STATUS_OK",
 418         "FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR"
 419 };
 420
 421 /***********************************************************************
 422  *
 423  * Class constructor/destructor
 424  *
 425  */
 426 FLAC_API FLAC__StreamEncoder *FLAC__stream_encoder_new()
 427 {
 428         FLAC__StreamEncoder *encoder;
 429         unsigned i;
 430
 431         FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
 432
 433         encoder = (FLAC__StreamEncoder*)calloc(1, sizeof(FLAC__StreamEncoder));
 434         if(encoder == 0) {
 435                 return 0;
 436         }
 437
 438         encoder->protected_ = (FLAC__StreamEncoderProtected*)calloc(1, sizeof(FLAC__StreamEncoderProtected));
 439         if(encoder->protected_ == 0) {
 440                 free(encoder);
 441                 return 0;
 442         }
 443
 444         encoder->private_ = (FLAC__StreamEncoderPrivate*)calloc(1, sizeof(FLAC__StreamEncoderPrivate));
 445         if(encoder->private_ == 0) {
 446                 free(encoder->protected_);
 447                 free(encoder);
 448                 return 0;
 449         }
 450
 451         encoder->private_->frame = FLAC__bitbuffer_new();
 452         if(encoder->private_->frame == 0) {
 453                 free(encoder->private_);
 454                 free(encoder->protected_);
 455                 free(encoder);
 456                 return 0;
 457         }
 458
 459         set_defaults_(encoder);
 460
 461         encoder->private_->is_being_deleted = false;
 462
 463         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 464                 encoder->private_->subframe_workspace_ptr[i][0] = &encoder->private_->subframe_workspace[i][0];
 465                 encoder->private_->subframe_workspace_ptr[i][1] = &encoder->private_->subframe_workspace[i][1];
 466         }
 467         for(i = 0; i < 2; i++) {
 468                 encoder->private_->subframe_workspace_ptr_mid_side[i][0] = &encoder->private_->subframe_workspace_mid_side[i][0];
 469                 encoder->private_->subframe_workspace_ptr_mid_side[i][1] = &encoder->private_->subframe_workspace_mid_side[i][1];
 470         }
 471         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 472                 encoder->private_->partitioned_rice_contents_workspace_ptr[i][0] = &encoder->private_->partitioned_rice_contents_workspace[i][0];
 473                 encoder->private_->partitioned_rice_contents_workspace_ptr[i][1] = &encoder->private_->partitioned_rice_contents_workspace[i][1];
 474         }
 475         for(i = 0; i < 2; i++) {
 476                 encoder->private_->partitioned_rice_contents_workspace_ptr_mid_side[i][0] = &encoder->private_->partitioned_rice_contents_workspace_mid_side[i][0];
 477                 encoder->private_->partitioned_rice_contents_workspace_ptr_mid_side[i][1] = &encoder->private_->partitioned_rice_contents_workspace_mid_side[i][1];
 478         }
 479
 480         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 481                 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&encoder->private_->partitioned_rice_contents_workspace[i][0]);
 482                 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&encoder->private_->partitioned_rice_contents_workspace[i][1]);
 483         }
 484         for(i = 0; i < 2; i++) {
 485                 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&encoder->private_->partitioned_rice_contents_workspace_mid_side[i][0]);
 486                 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&encoder->private_->partitioned_rice_contents_workspace_mid_side[i][1]);
 487         }
 488         for(i = 0; i < 2; i++)
 489                 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&encoder->private_->partitioned_rice_contents_extra[i]);
 490
 491         encoder->protected_->state = FLAC__STREAM_ENCODER_UNINITIALIZED;
 492
 493         return encoder;
 494 }
 495
 496 FLAC_API void FLAC__stream_encoder_delete(FLAC__StreamEncoder *encoder)
 497 {
 498         unsigned i;
 499
 500         FLAC__ASSERT(0 != encoder);
 501         FLAC__ASSERT(0 != encoder->protected_);
 502         FLAC__ASSERT(0 != encoder->private_);
 503         FLAC__ASSERT(0 != encoder->private_->frame);
 504
 505         encoder->private_->is_being_deleted = true;
 506
 507         FLAC__stream_encoder_finish(encoder);
 508
 509         if(encoder->protected_->verify && 0 != encoder->private_->verify.decoder)
 510                 FLAC__stream_decoder_delete(encoder->private_->verify.decoder);
 511
 512         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 513                 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&encoder->private_->partitioned_rice_contents_workspace[i][0]);
 514                 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&encoder->private_->partitioned_rice_contents_workspace[i][1]);
 515         }
 516         for(i = 0; i < 2; i++) {
 517                 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&encoder->private_->partitioned_rice_contents_workspace_mid_side[i][0]);
 518                 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&encoder->private_->partitioned_rice_contents_workspace_mid_side[i][1]);
 519         }
 520         for(i = 0; i < 2; i++)
 521                 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&encoder->private_->partitioned_rice_contents_extra[i]);
 522
 523         FLAC__bitbuffer_delete(encoder->private_->frame);
 524         free(encoder->private_);
 525         free(encoder->protected_);
 526         free(encoder);
 527 }
 528
 529 /***********************************************************************
 530  *
 531  * Public class methods
 532  *
 533  ***********************************************************************/
 534
 535 FLAC_API FLAC__StreamEncoderState FLAC__stream_encoder_init(FLAC__StreamEncoder *encoder)
 536 {
 537         unsigned i;
 538         FLAC__bool metadata_has_seektable, metadata_has_vorbis_comment;
 539
 540         FLAC__ASSERT(0 != encoder);
 541
 542         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 543                 return encoder->protected_->state = FLAC__STREAM_ENCODER_ALREADY_INITIALIZED;
 544
 545         encoder->protected_->state = FLAC__STREAM_ENCODER_OK;
 546
 547         if(0 == encoder->private_->write_callback || 0 == encoder->private_->metadata_callback)
 548                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_CALLBACK;
 549
 550         if(encoder->protected_->channels == 0 || encoder->protected_->channels > FLAC__MAX_CHANNELS)
 551                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_NUMBER_OF_CHANNELS;
 552
 553         if(encoder->protected_->do_mid_side_stereo && encoder->protected_->channels != 2)
 554                 return encoder->protected_->state = FLAC__STREAM_ENCODER_MID_SIDE_CHANNELS_MISMATCH;
 555
 556         if(encoder->protected_->loose_mid_side_stereo && !encoder->protected_->do_mid_side_stereo)
 557                 return encoder->protected_->state = FLAC__STREAM_ENCODER_ILLEGAL_MID_SIDE_FORCE;
 558
 559         if(encoder->protected_->bits_per_sample >= 32)
 560                 encoder->protected_->do_mid_side_stereo = false; /* since we do 32-bit math, the side channel would have 33 bps and overflow */
 561
 562         if(encoder->protected_->bits_per_sample < FLAC__MIN_BITS_PER_SAMPLE || encoder->protected_->bits_per_sample > FLAC__REFERENCE_CODEC_MAX_BITS_PER_SAMPLE)
 563                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_BITS_PER_SAMPLE;
 564
 565         if(!FLAC__format_sample_rate_is_valid(encoder->protected_->sample_rate))
 566                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_SAMPLE_RATE;
 567
 568         if(encoder->protected_->blocksize < FLAC__MIN_BLOCK_SIZE || encoder->protected_->blocksize > FLAC__MAX_BLOCK_SIZE)
 569                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_BLOCK_SIZE;
 570
 571         if(encoder->protected_->max_lpc_order > FLAC__MAX_LPC_ORDER)
 572                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_MAX_LPC_ORDER;
 573
 574         if(encoder->protected_->blocksize < encoder->protected_->max_lpc_order)
 575                 return encoder->protected_->state = FLAC__STREAM_ENCODER_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER;
 576
 577         if(encoder->protected_->qlp_coeff_precision == 0) {
 578                 if(encoder->protected_->bits_per_sample < 16) {
 579                         /* @@@ need some data about how to set this here w.r.t. blocksize and sample rate */
 580                         /* @@@ until then we'll make a guess */
 581                         encoder->protected_->qlp_coeff_precision = max(FLAC__MIN_QLP_COEFF_PRECISION, 2 + encoder->protected_->bits_per_sample / 2);
 582                 }
 583                 else if(encoder->protected_->bits_per_sample == 16) {
 584                         if(encoder->protected_->blocksize <= 192)
 585                                 encoder->protected_->qlp_coeff_precision = 7;
 586                         else if(encoder->protected_->blocksize <= 384)
 587                                 encoder->protected_->qlp_coeff_precision = 8;
 588                         else if(encoder->protected_->blocksize <= 576)
 589                                 encoder->protected_->qlp_coeff_precision = 9;
 590                         else if(encoder->protected_->blocksize <= 1152)
 591                                 encoder->protected_->qlp_coeff_precision = 10;
 592                         else if(encoder->protected_->blocksize <= 2304)
 593                                 encoder->protected_->qlp_coeff_precision = 11;
 594                         else if(encoder->protected_->blocksize <= 4608)
 595                                 encoder->protected_->qlp_coeff_precision = 12;
 596                         else
 597                                 encoder->protected_->qlp_coeff_precision = 13;
 598                 }
 599                 else {
 600                         if(encoder->protected_->blocksize <= 384)
 601                                 encoder->protected_->qlp_coeff_precision = FLAC__MAX_QLP_COEFF_PRECISION-2;
 602                         else if(encoder->protected_->blocksize <= 1152)
 603                                 encoder->protected_->qlp_coeff_precision = FLAC__MAX_QLP_COEFF_PRECISION-1;
 604                         else
 605                                 encoder->protected_->qlp_coeff_precision = FLAC__MAX_QLP_COEFF_PRECISION;
 606                 }
 607                 FLAC__ASSERT(encoder->protected_->qlp_coeff_precision <= FLAC__MAX_QLP_COEFF_PRECISION);
 608         }
 609         else if(encoder->protected_->qlp_coeff_precision < FLAC__MIN_QLP_COEFF_PRECISION || encoder->protected_->qlp_coeff_precision > FLAC__MAX_QLP_COEFF_PRECISION)
 610                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_QLP_COEFF_PRECISION;
 611
 612         if(encoder->protected_->streamable_subset) {
 613                 if(
 614                         encoder->protected_->blocksize != 192 &&
 615                         encoder->protected_->blocksize != 576 &&
 616                         encoder->protected_->blocksize != 1152 &&
 617                         encoder->protected_->blocksize != 2304 &&
 618                         encoder->protected_->blocksize != 4608 &&
 619                         encoder->protected_->blocksize != 256 &&
 620                         encoder->protected_->blocksize != 512 &&
 621                         encoder->protected_->blocksize != 1024 &&
 622                         encoder->protected_->blocksize != 2048 &&
 623                         encoder->protected_->blocksize != 4096 &&
 624                         encoder->protected_->blocksize != 8192 &&
 625                         encoder->protected_->blocksize != 16384
 626                 )
 627                         return encoder->protected_->state = FLAC__STREAM_ENCODER_NOT_STREAMABLE;
 628                 if(
 629                         encoder->protected_->sample_rate != 8000 &&
 630                         encoder->protected_->sample_rate != 16000 &&
 631                         encoder->protected_->sample_rate != 22050 &&
 632                         encoder->protected_->sample_rate != 24000 &&
 633                         encoder->protected_->sample_rate != 32000 &&
 634                         encoder->protected_->sample_rate != 44100 &&
 635                         encoder->protected_->sample_rate != 48000 &&
 636                         encoder->protected_->sample_rate != 96000
 637                 )
 638                         return encoder->protected_->state = FLAC__STREAM_ENCODER_NOT_STREAMABLE;
 639                 if(
 640                         encoder->protected_->bits_per_sample != 8 &&
 641                         encoder->protected_->bits_per_sample != 12 &&
 642                         encoder->protected_->bits_per_sample != 16 &&
 643                         encoder->protected_->bits_per_sample != 20 &&
 644                         encoder->protected_->bits_per_sample != 24
 645                 )
 646                         return encoder->protected_->state = FLAC__STREAM_ENCODER_NOT_STREAMABLE;
 647                 if(encoder->protected_->max_residual_partition_order > FLAC__SUBSET_MAX_RICE_PARTITION_ORDER)
 648                         return encoder->protected_->state = FLAC__STREAM_ENCODER_NOT_STREAMABLE;
 649         }
 650
 651         if(encoder->protected_->max_residual_partition_order >= (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
 652                 encoder->protected_->max_residual_partition_order = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN) - 1;
 653         if(encoder->protected_->min_residual_partition_order >= encoder->protected_->max_residual_partition_order)
 654                 encoder->protected_->min_residual_partition_order = encoder->protected_->max_residual_partition_order;
 655
 656         /* validate metadata */
 657         if(0 == encoder->protected_->metadata && encoder->protected_->num_metadata_blocks > 0)
 658                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_METADATA;
 659         metadata_has_seektable = false;
 660         metadata_has_vorbis_comment = false;
 661         for(i = 0; i < encoder->protected_->num_metadata_blocks; i++) {
 662                 if(encoder->protected_->metadata[i]->type == FLAC__METADATA_TYPE_STREAMINFO)
 663                         return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_METADATA;
 664                 else if(encoder->protected_->metadata[i]->type == FLAC__METADATA_TYPE_SEEKTABLE) {
 665                         if(metadata_has_seektable) /* only one is allowed */
 666                                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_METADATA;
 667                         metadata_has_seektable = true;
 668                         if(!FLAC__format_seektable_is_legal(&encoder->protected_->metadata[i]->data.seek_table))
 669                                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_METADATA;
 670                 }
 671                 else if(encoder->protected_->metadata[i]->type == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
 672                         if(metadata_has_vorbis_comment) /* only one is allowed */
 673                                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_METADATA;
 674                         metadata_has_vorbis_comment = true;
 675                 }
 676         }
 677
 678         encoder->private_->input_capacity = 0;
 679         for(i = 0; i < encoder->protected_->channels; i++) {
 680                 encoder->private_->integer_signal_unaligned[i] = encoder->private_->integer_signal[i] = 0;
 681                 encoder->private_->real_signal_unaligned[i] = encoder->private_->real_signal[i] = 0;
 682         }
 683         for(i = 0; i < 2; i++) {
 684                 encoder->private_->integer_signal_mid_side_unaligned[i] = encoder->private_->integer_signal_mid_side[i] = 0;
 685                 encoder->private_->real_signal_mid_side_unaligned[i] = encoder->private_->real_signal_mid_side[i] = 0;
 686         }
 687         for(i = 0; i < encoder->protected_->channels; i++) {
 688                 encoder->private_->residual_workspace_unaligned[i][0] = encoder->private_->residual_workspace[i][0] = 0;
 689                 encoder->private_->residual_workspace_unaligned[i][1] = encoder->private_->residual_workspace[i][1] = 0;
 690                 encoder->private_->best_subframe[i] = 0;
 691         }
 692         for(i = 0; i < 2; i++) {
 693                 encoder->private_->residual_workspace_mid_side_unaligned[i][0] = encoder->private_->residual_workspace_mid_side[i][0] = 0;
 694                 encoder->private_->residual_workspace_mid_side_unaligned[i][1] = encoder->private_->residual_workspace_mid_side[i][1] = 0;
 695                 encoder->private_->best_subframe_mid_side[i] = 0;
 696         }
 697         encoder->private_->abs_residual_unaligned = encoder->private_->abs_residual = 0;
 698         encoder->private_->abs_residual_partition_sums_unaligned = encoder->private_->abs_residual_partition_sums = 0;
 699         encoder->private_->raw_bits_per_partition_unaligned = encoder->private_->raw_bits_per_partition = 0;
 700         encoder->private_->loose_mid_side_stereo_frames_exact = (double)encoder->protected_->sample_rate * 0.4 / (double)encoder->protected_->blocksize;
 701         encoder->private_->loose_mid_side_stereo_frames = (unsigned)(encoder->private_->loose_mid_side_stereo_frames_exact + 0.5);
 702         if(encoder->private_->loose_mid_side_stereo_frames == 0)
 703                 encoder->private_->loose_mid_side_stereo_frames = 1;
 704         encoder->private_->loose_mid_side_stereo_frame_count = 0;
 705         encoder->private_->current_sample_number = 0;
 706         encoder->private_->current_frame_number = 0;
 707
 708         encoder->private_->use_wide_by_block = (encoder->protected_->bits_per_sample + FLAC__bitmath_ilog2(encoder->protected_->blocksize)+1 > 30);
 709         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? */
 710         encoder->private_->use_wide_by_partition = (false); /*@@@ need to set this */
 711
 712         /*
 713          * get the CPU info and set the function pointers
 714          */
 715         FLAC__cpu_info(&encoder->private_->cpuinfo);
 716         /* first default to the non-asm routines */
 717         encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation;
 718         encoder->private_->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor;
 719         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients;
 720         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_64bit = FLAC__lpc_compute_residual_from_qlp_coefficients_wide;
 721         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients;
 722         /* now override with asm where appropriate */
 723 #ifndef FLAC__NO_ASM
 724         if(encoder->private_->cpuinfo.use_asm) {
 725 #ifdef FLAC__CPU_IA32
 726                 FLAC__ASSERT(encoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
 727 #ifdef FLAC__HAS_NASM
 728                 if(0 && encoder->private_->cpuinfo.data.ia32.sse) {
 729                         if(encoder->protected_->max_lpc_order < 4)
 730                                 encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_4;
 731                         else if(encoder->protected_->max_lpc_order < 8)
 732                                 encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_8;
 733                         else if(encoder->protected_->max_lpc_order < 12)
 734                                 encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_12;
 735                         else
 736                                 encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32;
 737                 }
 738                 else if(encoder->private_->cpuinfo.data.ia32._3dnow)
 739                         encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_3dnow;
 740                 else
 741                         encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32;
 742                 if(encoder->private_->cpuinfo.data.ia32.mmx && encoder->private_->cpuinfo.data.ia32.cmov)
 743                         encoder->private_->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor_asm_ia32_mmx_cmov;
 744                 if(encoder->private_->cpuinfo.data.ia32.mmx) {
 745                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
 746                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32_mmx;
 747                 }
 748                 else {
 749                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
 750                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
 751                 }
 752 #endif
 753 #endif
 754         }
 755 #endif
 756         /* finally override based on wide-ness if necessary */
 757         if(encoder->private_->use_wide_by_block) {
 758                 encoder->private_->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor_wide;
 759         }
 760
 761         /* we require precompute_partition_sums if do_escape_coding because of their intertwined nature */
 762         encoder->private_->precompute_partition_sums = (encoder->protected_->max_residual_partition_order > encoder->protected_->min_residual_partition_order) || encoder->protected_->do_escape_coding;
 763
 764         if(!resize_buffers_(encoder, encoder->protected_->blocksize)) {
 765                 /* the above function sets the state for us in case of an error */
 766                 return encoder->protected_->state;
 767         }
 768
 769         if(!FLAC__bitbuffer_init(encoder->private_->frame))
 770                 return encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
 771
 772         /*
 773          * Set up the verify stuff if necessary
 774          */
 775         if(encoder->protected_->verify) {
 776                 /*
 777                  * First, set up the fifo which will hold the
 778                  * original signal to compare against
 779                  */
 780                 encoder->private_->verify.input_fifo.size = encoder->protected_->blocksize;
 781                 for(i = 0; i < encoder->protected_->channels; i++) {
 782                         if(0 == (encoder->private_->verify.input_fifo.data[i] = (FLAC__int32*)malloc(sizeof(FLAC__int32) * encoder->private_->verify.input_fifo.size)))
 783                                 return encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
 784                 }
 785                 encoder->private_->verify.input_fifo.tail = 0;
 786
 787                 /*
 788                  * Now set up a stream decoder for verification
 789                  */
 790                 encoder->private_->verify.decoder = FLAC__stream_decoder_new();
 791                 if(0 == encoder->private_->verify.decoder)
 792                         return encoder->protected_->state = FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR;
 793
 794                 FLAC__stream_decoder_set_read_callback(encoder->private_->verify.decoder, verify_read_callback_);
 795                 FLAC__stream_decoder_set_write_callback(encoder->private_->verify.decoder, verify_write_callback_);
 796                 FLAC__stream_decoder_set_metadata_callback(encoder->private_->verify.decoder, verify_metadata_callback_);
 797                 FLAC__stream_decoder_set_error_callback(encoder->private_->verify.decoder, verify_error_callback_);
 798                 FLAC__stream_decoder_set_client_data(encoder->private_->verify.decoder, encoder);
 799                 if(FLAC__stream_decoder_init(encoder->private_->verify.decoder) != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA)
 800                         return encoder->protected_->state = FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR;
 801         }
 802         encoder->private_->verify.error_stats.absolute_sample = 0;
 803         encoder->private_->verify.error_stats.frame_number = 0;
 804         encoder->private_->verify.error_stats.channel = 0;
 805         encoder->private_->verify.error_stats.sample = 0;
 806         encoder->private_->verify.error_stats.expected = 0;
 807         encoder->private_->verify.error_stats.got = 0;
 808
 809         /*
 810          * write the stream header
 811          */
 812         if(encoder->protected_->verify)
 813                 encoder->private_->verify.state_hint = ENCODER_IN_MAGIC;
 814         if(!FLAC__bitbuffer_write_raw_uint32(encoder->private_->frame, FLAC__STREAM_SYNC, FLAC__STREAM_SYNC_LEN))
 815                 return encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
 816         if(!write_bitbuffer_(encoder, 0)) {
 817                 /* the above function sets the state for us in case of an error */
 818                 return encoder->protected_->state;
 819         }
 820
 821         /*
 822          * write the STREAMINFO metadata block
 823          */
 824         if(encoder->protected_->verify)
 825                 encoder->private_->verify.state_hint = ENCODER_IN_METADATA;
 826         encoder->private_->metadata.type = FLAC__METADATA_TYPE_STREAMINFO;
 827         encoder->private_->metadata.is_last = false; /* we will have at a minimum a VORBIS_COMMENT afterwards */
 828         encoder->private_->metadata.length = FLAC__STREAM_METADATA_STREAMINFO_LENGTH;
 829         encoder->private_->metadata.data.stream_info.min_blocksize = encoder->protected_->blocksize; /* this encoder uses the same blocksize for the whole stream */
 830         encoder->private_->metadata.data.stream_info.max_blocksize = encoder->protected_->blocksize;
 831         encoder->private_->metadata.data.stream_info.min_framesize = 0; /* we don't know this yet; have to fill it in later */
 832         encoder->private_->metadata.data.stream_info.max_framesize = 0; /* we don't know this yet; have to fill it in later */
 833         encoder->private_->metadata.data.stream_info.sample_rate = encoder->protected_->sample_rate;
 834         encoder->private_->metadata.data.stream_info.channels = encoder->protected_->channels;
 835         encoder->private_->metadata.data.stream_info.bits_per_sample = encoder->protected_->bits_per_sample;
 836         encoder->private_->metadata.data.stream_info.total_samples = encoder->protected_->total_samples_estimate; /* we will replace this later with the real total */
 837         memset(encoder->private_->metadata.data.stream_info.md5sum, 0, 16); /* we don't know this yet; have to fill it in later */
 838         MD5Init(&encoder->private_->md5context);
 839         if(!FLAC__bitbuffer_clear(encoder->private_->frame)) {
 840                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
 841                 return false;
 842         }
 843         if(!FLAC__add_metadata_block(&encoder->private_->metadata, encoder->private_->frame))
 844                 return encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
 845         if(!write_bitbuffer_(encoder, 0)) {
 846                 /* the above function sets the state for us in case of an error */
 847                 return encoder->protected_->state;
 848         }
 849
 850         /*
 851          * Now that the STREAMINFO block is written, we can init this to an
 852          * absurdly-high value...
 853          */
 854         encoder->private_->metadata.data.stream_info.min_framesize = (1u << FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN) - 1;
 855         /* ... and clear this to 0 */
 856         encoder->private_->metadata.data.stream_info.total_samples = 0;
 857
 858         /*
 859          * Check to see if the supplied metadata contains a VORBIS_COMMENT;
 860          * if not, we will write an empty one (FLAC__add_metadata_block()
 861          * automatically supplies the vendor string).
 862          */
 863         if(!metadata_has_vorbis_comment) {
 864                 FLAC__StreamMetadata vorbis_comment;
 865                 vorbis_comment.type = FLAC__METADATA_TYPE_VORBIS_COMMENT;
 866                 vorbis_comment.is_last = (encoder->protected_->num_metadata_blocks == 0);
 867                 vorbis_comment.length = 4 + 4; /* MAGIC NUMBER */
 868                 vorbis_comment.data.vorbis_comment.vendor_string.length = 0;
 869                 vorbis_comment.data.vorbis_comment.vendor_string.entry = 0;
 870                 vorbis_comment.data.vorbis_comment.num_comments = 0;
 871                 vorbis_comment.data.vorbis_comment.comments = 0;
 872                 if(!FLAC__bitbuffer_clear(encoder->private_->frame)) {
 873                         encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
 874                         return false;
 875                 }
 876                 if(!FLAC__add_metadata_block(&vorbis_comment, encoder->private_->frame))
 877                         return encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
 878                 if(!write_bitbuffer_(encoder, 0)) {
 879                         /* the above function sets the state for us in case of an error */
 880                         return encoder->protected_->state;
 881                 }
 882         }
 883
 884         /*
 885          * write the user's metadata blocks
 886          */
 887         for(i = 0; i < encoder->protected_->num_metadata_blocks; i++) {
 888                 encoder->protected_->metadata[i]->is_last = (i == encoder->protected_->num_metadata_blocks - 1);
 889                 if(!FLAC__bitbuffer_clear(encoder->private_->frame)) {
 890                         encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
 891                         return false;
 892                 }
 893                 if(!FLAC__add_metadata_block(encoder->protected_->metadata[i], encoder->private_->frame))
 894                         return encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
 895                 if(!write_bitbuffer_(encoder, 0)) {
 896                         /* the above function sets the state for us in case of an error */
 897                         return encoder->protected_->state;
 898                 }
 899         }
 900
 901         if(encoder->protected_->verify)
 902                 encoder->private_->verify.state_hint = ENCODER_IN_AUDIO;
 903
 904         return encoder->protected_->state;
 905 }
 906
 907 FLAC_API void FLAC__stream_encoder_finish(FLAC__StreamEncoder *encoder)
 908 {
 909         FLAC__ASSERT(0 != encoder);
 910
 911         if(encoder->protected_->state == FLAC__STREAM_ENCODER_UNINITIALIZED)
 912                 return;
 913
 914         if(encoder->protected_->state == FLAC__STREAM_ENCODER_OK && !encoder->private_->is_being_deleted) {
 915                 if(encoder->private_->current_sample_number != 0) {
 916                         encoder->protected_->blocksize = encoder->private_->current_sample_number;
 917                         process_frame_(encoder, true); /* true => is last frame */
 918                 }
 919         }
 920
 921         MD5Final(encoder->private_->metadata.data.stream_info.md5sum, &encoder->private_->md5context);
 922
 923         if(encoder->protected_->state == FLAC__STREAM_ENCODER_OK && !encoder->private_->is_being_deleted) {
 924                 encoder->private_->metadata_callback(encoder, &encoder->private_->metadata, encoder->private_->client_data);
 925         }
 926
 927         if(encoder->protected_->verify && 0 != encoder->private_->verify.decoder)
 928                 FLAC__stream_decoder_finish(encoder->private_->verify.decoder);
 929
 930         free_(encoder);
 931         set_defaults_(encoder);
 932
 933         encoder->protected_->state = FLAC__STREAM_ENCODER_UNINITIALIZED;
 934 }
 935
 936 FLAC_API FLAC__bool FLAC__stream_encoder_set_verify(FLAC__StreamEncoder *encoder, FLAC__bool value)
 937 {
 938         FLAC__ASSERT(0 != encoder);
 939         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 940                 return false;
 941         encoder->protected_->verify = value;
 942         return true;
 943 }
 944
 945 FLAC_API FLAC__bool FLAC__stream_encoder_set_streamable_subset(FLAC__StreamEncoder *encoder, FLAC__bool value)
 946 {
 947         FLAC__ASSERT(0 != encoder);
 948         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 949                 return false;
 950         encoder->protected_->streamable_subset = value;
 951         return true;
 952 }
 953
 954 FLAC_API FLAC__bool FLAC__stream_encoder_set_do_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value)
 955 {
 956         FLAC__ASSERT(0 != encoder);
 957         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 958                 return false;
 959         encoder->protected_->do_mid_side_stereo = value;
 960         return true;
 961 }
 962
 963 FLAC_API FLAC__bool FLAC__stream_encoder_set_loose_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value)
 964 {
 965         FLAC__ASSERT(0 != encoder);
 966         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 967                 return false;
 968         encoder->protected_->loose_mid_side_stereo = value;
 969         return true;
 970 }
 971
 972 FLAC_API FLAC__bool FLAC__stream_encoder_set_channels(FLAC__StreamEncoder *encoder, unsigned value)
 973 {
 974         FLAC__ASSERT(0 != encoder);
 975         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 976                 return false;
 977         encoder->protected_->channels = value;
 978         return true;
 979 }
 980
 981 FLAC_API FLAC__bool FLAC__stream_encoder_set_bits_per_sample(FLAC__StreamEncoder *encoder, unsigned value)
 982 {
 983         FLAC__ASSERT(0 != encoder);
 984         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 985                 return false;
 986         encoder->protected_->bits_per_sample = value;
 987         return true;
 988 }
 989
 990 FLAC_API FLAC__bool FLAC__stream_encoder_set_sample_rate(FLAC__StreamEncoder *encoder, unsigned value)
 991 {
 992         FLAC__ASSERT(0 != encoder);
 993         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 994                 return false;
 995         encoder->protected_->sample_rate = value;
 996         return true;
 997 }
 998
 999 FLAC_API FLAC__bool FLAC__stream_encoder_set_blocksize(FLAC__StreamEncoder *encoder, unsigned value)
1000 {
1001         FLAC__ASSERT(0 != encoder);
1002         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1003                 return false;
1004         encoder->protected_->blocksize = value;
1005         return true;
1006 }
1007
1008 FLAC_API FLAC__bool FLAC__stream_encoder_set_max_lpc_order(FLAC__StreamEncoder *encoder, unsigned value)
1009 {
1010         FLAC__ASSERT(0 != encoder);
1011         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1012                 return false;
1013         encoder->protected_->max_lpc_order = value;
1014         return true;
1015 }
1016
1017 FLAC_API FLAC__bool FLAC__stream_encoder_set_qlp_coeff_precision(FLAC__StreamEncoder *encoder, unsigned value)
1018 {
1019         FLAC__ASSERT(0 != encoder);
1020         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1021                 return false;
1022         encoder->protected_->qlp_coeff_precision = value;
1023         return true;
1024 }
1025
1026 FLAC_API FLAC__bool FLAC__stream_encoder_set_do_qlp_coeff_prec_search(FLAC__StreamEncoder *encoder, FLAC__bool value)
1027 {
1028         FLAC__ASSERT(0 != encoder);
1029         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1030                 return false;
1031         encoder->protected_->do_qlp_coeff_prec_search = value;
1032         return true;
1033 }
1034
1035 FLAC_API FLAC__bool FLAC__stream_encoder_set_do_escape_coding(FLAC__StreamEncoder *encoder, FLAC__bool value)
1036 {
1037         FLAC__ASSERT(0 != encoder);
1038         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1039                 return false;
1040 #if 0
1041         /*@@@ deprecated: */
1042         encoder->protected_->do_escape_coding = value;
1043 #else
1044         (void)value;
1045 #endif
1046         return true;
1047 }
1048
1049 FLAC_API FLAC__bool FLAC__stream_encoder_set_do_exhaustive_model_search(FLAC__StreamEncoder *encoder, FLAC__bool value)
1050 {
1051         FLAC__ASSERT(0 != encoder);
1052         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1053                 return false;
1054         encoder->protected_->do_exhaustive_model_search = value;
1055         return true;
1056 }
1057
1058 FLAC_API FLAC__bool FLAC__stream_encoder_set_min_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value)
1059 {
1060         FLAC__ASSERT(0 != encoder);
1061         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1062                 return false;
1063         encoder->protected_->min_residual_partition_order = value;
1064         return true;
1065 }
1066
1067 FLAC_API FLAC__bool FLAC__stream_encoder_set_max_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value)
1068 {
1069         FLAC__ASSERT(0 != encoder);
1070         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1071                 return false;
1072         encoder->protected_->max_residual_partition_order = value;
1073         return true;
1074 }
1075
1076 FLAC_API FLAC__bool FLAC__stream_encoder_set_rice_parameter_search_dist(FLAC__StreamEncoder *encoder, unsigned value)
1077 {
1078         FLAC__ASSERT(0 != encoder);
1079         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1080                 return false;
1081 #if 0
1082         /*@@@ deprecated: */
1083         encoder->protected_->rice_parameter_search_dist = value;
1084 #else
1085         (void)value;
1086 #endif
1087         return true;
1088 }
1089
1090 FLAC_API FLAC__bool FLAC__stream_encoder_set_total_samples_estimate(FLAC__StreamEncoder *encoder, FLAC__uint64 value)
1091 {
1092         FLAC__ASSERT(0 != encoder);
1093         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1094                 return false;
1095         encoder->protected_->total_samples_estimate = value;
1096         return true;
1097 }
1098
1099 FLAC_API FLAC__bool FLAC__stream_encoder_set_metadata(FLAC__StreamEncoder *encoder, FLAC__StreamMetadata **metadata, unsigned num_blocks)
1100 {
1101         FLAC__ASSERT(0 != encoder);
1102         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1103                 return false;
1104         encoder->protected_->metadata = metadata;
1105         encoder->protected_->num_metadata_blocks = num_blocks;
1106         return true;
1107 }
1108
1109 FLAC_API FLAC__bool FLAC__stream_encoder_set_write_callback(FLAC__StreamEncoder *encoder, FLAC__StreamEncoderWriteCallback value)
1110 {
1111         FLAC__ASSERT(0 != encoder);
1112         FLAC__ASSERT(0 != value);
1113         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1114                 return false;
1115         encoder->private_->write_callback = value;
1116         return true;
1117 }
1118
1119 FLAC_API FLAC__bool FLAC__stream_encoder_set_metadata_callback(FLAC__StreamEncoder *encoder, FLAC__StreamEncoderMetadataCallback value)
1120 {
1121         FLAC__ASSERT(0 != encoder);
1122         FLAC__ASSERT(0 != value);
1123         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1124                 return false;
1125         encoder->private_->metadata_callback = value;
1126         return true;
1127 }
1128
1129 FLAC_API FLAC__bool FLAC__stream_encoder_set_client_data(FLAC__StreamEncoder *encoder, void *value)
1130 {
1131         FLAC__ASSERT(0 != encoder);
1132         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1133                 return false;
1134         encoder->private_->client_data = value;
1135         return true;
1136 }
1137
1138 /*
1139  * These three functions are not static, but not publically exposed in
1140  * include/FLAC/ either.  They are used by the test suite.
1141  */
1142 FLAC_API FLAC__bool FLAC__stream_encoder_disable_constant_subframes(FLAC__StreamEncoder *encoder, FLAC__bool value)
1143 {
1144         FLAC__ASSERT(0 != encoder);
1145         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1146                 return false;
1147         encoder->private_->disable_constant_subframes = value;
1148         return true;
1149 }
1150
1151 FLAC_API FLAC__bool FLAC__stream_encoder_disable_fixed_subframes(FLAC__StreamEncoder *encoder, FLAC__bool value)
1152 {
1153         FLAC__ASSERT(0 != encoder);
1154         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1155                 return false;
1156         encoder->private_->disable_fixed_subframes = value;
1157         return true;
1158 }
1159
1160 FLAC_API FLAC__bool FLAC__stream_encoder_disable_verbatim_subframes(FLAC__StreamEncoder *encoder, FLAC__bool value)
1161 {
1162         FLAC__ASSERT(0 != encoder);
1163         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
1164                 return false;
1165         encoder->private_->disable_verbatim_subframes = value;
1166         return true;
1167 }
1168
1169 FLAC_API FLAC__StreamEncoderState FLAC__stream_encoder_get_state(const FLAC__StreamEncoder *encoder)
1170 {
1171         FLAC__ASSERT(0 != encoder);
1172         return encoder->protected_->state;
1173 }
1174
1175 FLAC_API FLAC__StreamDecoderState FLAC__stream_encoder_get_verify_decoder_state(const FLAC__StreamEncoder *encoder)
1176 {
1177         FLAC__ASSERT(0 != encoder);
1178         if(encoder->protected_->verify)
1179                 return FLAC__stream_decoder_get_state(encoder->private_->verify.decoder);
1180         else
1181                 return FLAC__STREAM_DECODER_UNINITIALIZED;
1182 }
1183
1184 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)
1185 {
1186         FLAC__ASSERT(0 != encoder);
1187         if(0 != absolute_sample)
1188                 *absolute_sample = encoder->private_->verify.error_stats.absolute_sample;
1189         if(0 != frame_number)
1190                 *frame_number = encoder->private_->verify.error_stats.frame_number;
1191         if(0 != channel)
1192                 *channel = encoder->private_->verify.error_stats.channel;
1193         if(0 != sample)
1194                 *sample = encoder->private_->verify.error_stats.sample;
1195         if(0 != expected)
1196                 *expected = encoder->private_->verify.error_stats.expected;
1197         if(0 != got)
1198                 *got = encoder->private_->verify.error_stats.got;
1199 }
1200
1201 FLAC_API FLAC__bool FLAC__stream_encoder_get_verify(const FLAC__StreamEncoder *encoder)
1202 {
1203         FLAC__ASSERT(0 != encoder);
1204         return encoder->protected_->verify;
1205 }
1206
1207 FLAC_API FLAC__bool FLAC__stream_encoder_get_streamable_subset(const FLAC__StreamEncoder *encoder)
1208 {
1209         FLAC__ASSERT(0 != encoder);
1210         return encoder->protected_->streamable_subset;
1211 }
1212
1213 FLAC_API FLAC__bool FLAC__stream_encoder_get_do_mid_side_stereo(const FLAC__StreamEncoder *encoder)
1214 {
1215         FLAC__ASSERT(0 != encoder);
1216         return encoder->protected_->do_mid_side_stereo;
1217 }
1218
1219 FLAC_API FLAC__bool FLAC__stream_encoder_get_loose_mid_side_stereo(const FLAC__StreamEncoder *encoder)
1220 {
1221         FLAC__ASSERT(0 != encoder);
1222         return encoder->protected_->loose_mid_side_stereo;
1223 }
1224
1225 FLAC_API unsigned FLAC__stream_encoder_get_channels(const FLAC__StreamEncoder *encoder)
1226 {
1227         FLAC__ASSERT(0 != encoder);
1228         return encoder->protected_->channels;
1229 }
1230
1231 FLAC_API unsigned FLAC__stream_encoder_get_bits_per_sample(const FLAC__StreamEncoder *encoder)
1232 {
1233         FLAC__ASSERT(0 != encoder);
1234         return encoder->protected_->bits_per_sample;
1235 }
1236
1237 FLAC_API unsigned FLAC__stream_encoder_get_sample_rate(const FLAC__StreamEncoder *encoder)
1238 {
1239         FLAC__ASSERT(0 != encoder);
1240         return encoder->protected_->sample_rate;
1241 }
1242
1243 FLAC_API unsigned FLAC__stream_encoder_get_blocksize(const FLAC__StreamEncoder *encoder)
1244 {
1245         FLAC__ASSERT(0 != encoder);
1246         return encoder->protected_->blocksize;
1247 }
1248
1249 FLAC_API unsigned FLAC__stream_encoder_get_max_lpc_order(const FLAC__StreamEncoder *encoder)
1250 {
1251         FLAC__ASSERT(0 != encoder);
1252         return encoder->protected_->max_lpc_order;
1253 }
1254
1255 FLAC_API unsigned FLAC__stream_encoder_get_qlp_coeff_precision(const FLAC__StreamEncoder *encoder)
1256 {
1257         FLAC__ASSERT(0 != encoder);
1258         return encoder->protected_->qlp_coeff_precision;
1259 }
1260
1261 FLAC_API FLAC__bool FLAC__stream_encoder_get_do_qlp_coeff_prec_search(const FLAC__StreamEncoder *encoder)
1262 {
1263         FLAC__ASSERT(0 != encoder);
1264         return encoder->protected_->do_qlp_coeff_prec_search;
1265 }
1266
1267 FLAC_API FLAC__bool FLAC__stream_encoder_get_do_escape_coding(const FLAC__StreamEncoder *encoder)
1268 {
1269         FLAC__ASSERT(0 != encoder);
1270         return encoder->protected_->do_escape_coding;
1271 }
1272
1273 FLAC_API FLAC__bool FLAC__stream_encoder_get_do_exhaustive_model_search(const FLAC__StreamEncoder *encoder)
1274 {
1275         FLAC__ASSERT(0 != encoder);
1276         return encoder->protected_->do_exhaustive_model_search;
1277 }
1278
1279 FLAC_API unsigned FLAC__stream_encoder_get_min_residual_partition_order(const FLAC__StreamEncoder *encoder)
1280 {
1281         FLAC__ASSERT(0 != encoder);
1282         return encoder->protected_->min_residual_partition_order;
1283 }
1284
1285 FLAC_API unsigned FLAC__stream_encoder_get_max_residual_partition_order(const FLAC__StreamEncoder *encoder)
1286 {
1287         FLAC__ASSERT(0 != encoder);
1288         return encoder->protected_->max_residual_partition_order;
1289 }
1290
1291 FLAC_API unsigned FLAC__stream_encoder_get_rice_parameter_search_dist(const FLAC__StreamEncoder *encoder)
1292 {
1293         FLAC__ASSERT(0 != encoder);
1294         return encoder->protected_->rice_parameter_search_dist;
1295 }
1296
1297 FLAC_API FLAC__uint64 FLAC__stream_encoder_get_total_samples_estimate(const FLAC__StreamEncoder *encoder)
1298 {
1299         FLAC__ASSERT(0 != encoder);
1300         return encoder->protected_->total_samples_estimate;
1301 }
1302
1303 FLAC_API FLAC__bool FLAC__stream_encoder_process(FLAC__StreamEncoder *encoder, const FLAC__int32 * const buffer[], unsigned samples)
1304 {
1305         unsigned i, j, channel;
1306         FLAC__int32 x, mid, side;
1307         const unsigned channels = encoder->protected_->channels, blocksize = encoder->protected_->blocksize;
1308
1309         FLAC__ASSERT(0 != encoder);
1310         FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
1311
1312         j = 0;
1313         if(encoder->protected_->do_mid_side_stereo && channels == 2) {
1314                 do {
1315                         if(encoder->protected_->verify)
1316                                 append_to_verify_fifo_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize-encoder->private_->current_sample_number, samples-j));
1317
1318                         for(i = encoder->private_->current_sample_number; i < blocksize && j < samples; i++, j++) {
1319                                 x = mid = side = buffer[0][j];
1320                                 encoder->private_->integer_signal[0][i] = x;
1321                                 encoder->private_->real_signal[0][i] = (FLAC__real)x;
1322                                 x = buffer[1][j];
1323                                 encoder->private_->integer_signal[1][i] = x;
1324                                 encoder->private_->real_signal[1][i] = (FLAC__real)x;
1325                                 mid += x;
1326                                 side -= x;
1327                                 mid >>= 1; /* NOTE: not the same as 'mid = (buffer[0][j] + buffer[1][j]) / 2' ! */
1328                                 encoder->private_->integer_signal_mid_side[1][i] = side;
1329                                 encoder->private_->integer_signal_mid_side[0][i] = mid;
1330                                 encoder->private_->real_signal_mid_side[1][i] = (FLAC__real)side;
1331                                 encoder->private_->real_signal_mid_side[0][i] = (FLAC__real)mid;
1332                                 encoder->private_->current_sample_number++;
1333                         }
1334                         if(i == blocksize) {
1335                                 if(!process_frame_(encoder, false)) /* false => not last frame */
1336                                         return false;
1337                         }
1338                 } while(j < samples);
1339         }
1340         else {
1341                 do {
1342                         if(encoder->protected_->verify)
1343                                 append_to_verify_fifo_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize-encoder->private_->current_sample_number, samples-j));
1344
1345                         for(i = encoder->private_->current_sample_number; i < blocksize && j < samples; i++, j++) {
1346                                 for(channel = 0; channel < channels; channel++) {
1347                                         x = buffer[channel][j];
1348                                         encoder->private_->integer_signal[channel][i] = x;
1349                                         encoder->private_->real_signal[channel][i] = (FLAC__real)x;
1350                                 }
1351                                 encoder->private_->current_sample_number++;
1352                         }
1353                         if(i == blocksize) {
1354                                 if(!process_frame_(encoder, false)) /* false => not last frame */
1355                                         return false;
1356                         }
1357                 } while(j < samples);
1358         }
1359
1360         return true;
1361 }
1362
1363 FLAC_API FLAC__bool FLAC__stream_encoder_process_interleaved(FLAC__StreamEncoder *encoder, const FLAC__int32 buffer[], unsigned samples)
1364 {
1365         unsigned i, j, k, channel;
1366         FLAC__int32 x, mid, side;
1367         const unsigned channels = encoder->protected_->channels, blocksize = encoder->protected_->blocksize;
1368
1369         FLAC__ASSERT(0 != encoder);
1370         FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
1371
1372         j = k = 0;
1373         if(encoder->protected_->do_mid_side_stereo && channels == 2) {
1374                 do {
1375                         if(encoder->protected_->verify)
1376                                 append_to_verify_fifo_interleaved_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize-encoder->private_->current_sample_number, samples-j));
1377
1378                         for(i = encoder->private_->current_sample_number; i < blocksize && j < samples; i++, j++) {
1379                                 x = mid = side = buffer[k++];
1380                                 encoder->private_->integer_signal[0][i] = x;
1381                                 encoder->private_->real_signal[0][i] = (FLAC__real)x;
1382                                 x = buffer[k++];
1383                                 encoder->private_->integer_signal[1][i] = x;
1384                                 encoder->private_->real_signal[1][i] = (FLAC__real)x;
1385                                 mid += x;
1386                                 side -= x;
1387                                 mid >>= 1; /* NOTE: not the same as 'mid = (left + right) / 2' ! */
1388                                 encoder->private_->integer_signal_mid_side[1][i] = side;
1389                                 encoder->private_->integer_signal_mid_side[0][i] = mid;
1390                                 encoder->private_->real_signal_mid_side[1][i] = (FLAC__real)side;
1391                                 encoder->private_->real_signal_mid_side[0][i] = (FLAC__real)mid;
1392                                 encoder->private_->current_sample_number++;
1393                         }
1394                         if(i == blocksize) {
1395                                 if(!process_frame_(encoder, false)) /* false => not last frame */
1396                                         return false;
1397                         }
1398                 } while(j < samples);
1399         }
1400         else {
1401                 do {
1402                         if(encoder->protected_->verify)
1403                                 append_to_verify_fifo_interleaved_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize-encoder->private_->current_sample_number, samples-j));
1404
1405                         for(i = encoder->private_->current_sample_number; i < blocksize && j < samples; i++, j++) {
1406                                 for(channel = 0; channel < channels; channel++) {
1407                                         x = buffer[k++];
1408                                         encoder->private_->integer_signal[channel][i] = x;
1409                                         encoder->private_->real_signal[channel][i] = (FLAC__real)x;
1410                                 }
1411                                 encoder->private_->current_sample_number++;
1412                         }
1413                         if(i == blocksize) {
1414                                 if(!process_frame_(encoder, false)) /* false => not last frame */
1415                                         return false;
1416                         }
1417                 } while(j < samples);
1418         }
1419
1420         return true;
1421 }
1422
1423 /***********************************************************************
1424  *
1425  * Private class methods
1426  *
1427  ***********************************************************************/
1428
1429 void set_defaults_(FLAC__StreamEncoder *encoder)
1430 {
1431         FLAC__ASSERT(0 != encoder);
1432
1433         encoder->protected_->verify = false;
1434         encoder->protected_->streamable_subset = true;
1435         encoder->protected_->do_mid_side_stereo = false;
1436         encoder->protected_->loose_mid_side_stereo = false;
1437         encoder->protected_->channels = 2;
1438         encoder->protected_->bits_per_sample = 16;
1439         encoder->protected_->sample_rate = 44100;
1440         encoder->protected_->blocksize = 1152;
1441         encoder->protected_->max_lpc_order = 0;
1442         encoder->protected_->qlp_coeff_precision = 0;
1443         encoder->protected_->do_qlp_coeff_prec_search = false;
1444         encoder->protected_->do_exhaustive_model_search = false;
1445         encoder->protected_->do_escape_coding = false;
1446         encoder->protected_->min_residual_partition_order = 0;
1447         encoder->protected_->max_residual_partition_order = 0;
1448         encoder->protected_->rice_parameter_search_dist = 0;
1449         encoder->protected_->total_samples_estimate = 0;
1450         encoder->protected_->metadata = 0;
1451         encoder->protected_->num_metadata_blocks = 0;
1452
1453         encoder->private_->disable_constant_subframes = false;
1454         encoder->private_->disable_fixed_subframes = false;
1455         encoder->private_->disable_verbatim_subframes = false;
1456         encoder->private_->write_callback = 0;
1457         encoder->private_->metadata_callback = 0;
1458         encoder->private_->client_data = 0;
1459 }
1460
1461 void free_(FLAC__StreamEncoder *encoder)
1462 {
1463         unsigned i, channel;
1464
1465         FLAC__ASSERT(0 != encoder);
1466         for(i = 0; i < encoder->protected_->channels; i++) {
1467                 if(0 != encoder->private_->integer_signal_unaligned[i]) {
1468                         free(encoder->private_->integer_signal_unaligned[i]);
1469                         encoder->private_->integer_signal_unaligned[i] = 0;
1470                 }
1471                 if(0 != encoder->private_->real_signal_unaligned[i]) {
1472                         free(encoder->private_->real_signal_unaligned[i]);
1473                         encoder->private_->real_signal_unaligned[i] = 0;
1474                 }
1475         }
1476         for(i = 0; i < 2; i++) {
1477                 if(0 != encoder->private_->integer_signal_mid_side_unaligned[i]) {
1478                         free(encoder->private_->integer_signal_mid_side_unaligned[i]);
1479                         encoder->private_->integer_signal_mid_side_unaligned[i] = 0;
1480                 }
1481                 if(0 != encoder->private_->real_signal_mid_side_unaligned[i]) {
1482                         free(encoder->private_->real_signal_mid_side_unaligned[i]);
1483                         encoder->private_->real_signal_mid_side_unaligned[i] = 0;
1484                 }
1485         }
1486         for(channel = 0; channel < encoder->protected_->channels; channel++) {
1487                 for(i = 0; i < 2; i++) {
1488                         if(0 != encoder->private_->residual_workspace_unaligned[channel][i]) {
1489                                 free(encoder->private_->residual_workspace_unaligned[channel][i]);
1490                                 encoder->private_->residual_workspace_unaligned[channel][i] = 0;
1491                         }
1492                 }
1493         }
1494         for(channel = 0; channel < 2; channel++) {
1495                 for(i = 0; i < 2; i++) {
1496                         if(0 != encoder->private_->residual_workspace_mid_side_unaligned[channel][i]) {
1497                                 free(encoder->private_->residual_workspace_mid_side_unaligned[channel][i]);
1498                                 encoder->private_->residual_workspace_mid_side_unaligned[channel][i] = 0;
1499                         }
1500                 }
1501         }
1502         if(0 != encoder->private_->abs_residual_unaligned) {
1503                 free(encoder->private_->abs_residual_unaligned);
1504                 encoder->private_->abs_residual_unaligned = 0;
1505         }
1506         if(0 != encoder->private_->abs_residual_partition_sums_unaligned) {
1507                 free(encoder->private_->abs_residual_partition_sums_unaligned);
1508                 encoder->private_->abs_residual_partition_sums_unaligned = 0;
1509         }
1510         if(0 != encoder->private_->raw_bits_per_partition_unaligned) {
1511                 free(encoder->private_->raw_bits_per_partition_unaligned);
1512                 encoder->private_->raw_bits_per_partition_unaligned = 0;
1513         }
1514         if(encoder->protected_->verify) {
1515                 for(i = 0; i < encoder->protected_->channels; i++) {
1516                         if(0 != encoder->private_->verify.input_fifo.data[i]) {
1517                                 free(encoder->private_->verify.input_fifo.data[i]);
1518                                 encoder->private_->verify.input_fifo.data[i] = 0;
1519                         }
1520                 }
1521         }
1522         FLAC__bitbuffer_free(encoder->private_->frame);
1523 }
1524
1525 FLAC__bool resize_buffers_(FLAC__StreamEncoder *encoder, unsigned new_size)
1526 {
1527         FLAC__bool ok;
1528         unsigned i, channel;
1529
1530         FLAC__ASSERT(new_size > 0);
1531         FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
1532         FLAC__ASSERT(encoder->private_->current_sample_number == 0);
1533
1534         /* To avoid excessive malloc'ing, we only grow the buffer; no shrinking. */
1535         if(new_size <= encoder->private_->input_capacity)
1536                 return true;
1537
1538         ok = true;
1539
1540         /* WATCHOUT: FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32_mmx()
1541          * requires that the input arrays (in our case the integer signals)
1542          * have a buffer of up to 3 zeroes in front (at negative indices) for
1543          * alignment purposes; we use 4 to keep the data well-aligned.
1544          */
1545
1546         for(i = 0; ok && i < encoder->protected_->channels; i++) {
1547                 ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size+4, &encoder->private_->integer_signal_unaligned[i], &encoder->private_->integer_signal[i]);
1548                 ok = ok && FLAC__memory_alloc_aligned_real_array(new_size, &encoder->private_->real_signal_unaligned[i], &encoder->private_->real_signal[i]);
1549                 memset(encoder->private_->integer_signal[i], 0, sizeof(FLAC__int32)*4);
1550                 encoder->private_->integer_signal[i] += 4;
1551         }
1552         for(i = 0; ok && i < 2; i++) {
1553                 ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size+4, &encoder->private_->integer_signal_mid_side_unaligned[i], &encoder->private_->integer_signal_mid_side[i]);
1554                 ok = ok && FLAC__memory_alloc_aligned_real_array(new_size, &encoder->private_->real_signal_mid_side_unaligned[i], &encoder->private_->real_signal_mid_side[i]);
1555                 memset(encoder->private_->integer_signal_mid_side[i], 0, sizeof(FLAC__int32)*4);
1556                 encoder->private_->integer_signal_mid_side[i] += 4;
1557         }
1558         for(channel = 0; ok && channel < encoder->protected_->channels; channel++) {
1559                 for(i = 0; ok && i < 2; i++) {
1560                         ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size, &encoder->private_->residual_workspace_unaligned[channel][i], &encoder->private_->residual_workspace[channel][i]);
1561                 }
1562         }
1563         for(channel = 0; ok && channel < 2; channel++) {
1564                 for(i = 0; ok && i < 2; i++) {
1565                         ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size, &encoder->private_->residual_workspace_mid_side_unaligned[channel][i], &encoder->private_->residual_workspace_mid_side[channel][i]);
1566                 }
1567         }
1568         ok = ok && FLAC__memory_alloc_aligned_uint32_array(new_size, &encoder->private_->abs_residual_unaligned, &encoder->private_->abs_residual);
1569         if(encoder->private_->precompute_partition_sums || encoder->protected_->do_escape_coding) /* we require precompute_partition_sums if do_escape_coding because of their intertwined nature */
1570                 ok = ok && FLAC__memory_alloc_aligned_uint64_array(new_size * 2, &encoder->private_->abs_residual_partition_sums_unaligned, &encoder->private_->abs_residual_partition_sums);
1571         if(encoder->protected_->do_escape_coding)
1572                 ok = ok && FLAC__memory_alloc_aligned_unsigned_array(new_size * 2, &encoder->private_->raw_bits_per_partition_unaligned, &encoder->private_->raw_bits_per_partition);
1573
1574         if(ok)
1575                 encoder->private_->input_capacity = new_size;
1576         else
1577                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
1578
1579         return ok;
1580 }
1581
1582 FLAC__bool write_bitbuffer_(FLAC__StreamEncoder *encoder, unsigned samples)
1583 {
1584         const FLAC__byte *buffer;
1585         unsigned bytes;
1586
1587         FLAC__ASSERT(FLAC__bitbuffer_is_byte_aligned(encoder->private_->frame));
1588
1589         FLAC__bitbuffer_get_buffer(encoder->private_->frame, &buffer, &bytes);
1590
1591         if(encoder->protected_->verify) {
1592                 encoder->private_->verify.output.data = buffer;
1593                 encoder->private_->verify.output.bytes = bytes;
1594                 if(encoder->private_->verify.state_hint == ENCODER_IN_MAGIC) {
1595                         encoder->private_->verify.needs_magic_hack = true;
1596                 }
1597                 else {
1598                         if(!FLAC__stream_decoder_process_single(encoder->private_->verify.decoder)) {
1599                                 FLAC__bitbuffer_release_buffer(encoder->private_->frame);
1600                                 if(encoder->protected_->state != FLAC__STREAM_ENCODER_VERIFY_MISMATCH_IN_AUDIO_DATA)
1601                                         encoder->protected_->state = FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR;
1602                                 return false;
1603                         }
1604                 }
1605         }
1606
1607         if(encoder->private_->write_callback(encoder, buffer, bytes, samples, encoder->private_->current_frame_number, encoder->private_->client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) {
1608                 encoder->protected_->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_WRITING;
1609                 return false;
1610         }
1611
1612         FLAC__bitbuffer_release_buffer(encoder->private_->frame);
1613
1614         if(samples > 0) {
1615                 encoder->private_->metadata.data.stream_info.min_framesize = min(bytes, encoder->private_->metadata.data.stream_info.min_framesize);
1616                 encoder->private_->metadata.data.stream_info.max_framesize = max(bytes, encoder->private_->metadata.data.stream_info.max_framesize);
1617         }
1618
1619         return true;
1620 }
1621
1622 FLAC__bool process_frame_(FLAC__StreamEncoder *encoder, FLAC__bool is_last_frame)
1623 {
1624         FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
1625
1626         /*
1627          * Accumulate raw signal to the MD5 signature
1628          */
1629         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)) {
1630                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
1631                 return false;
1632         }
1633
1634         /*
1635          * Process the frame header and subframes into the frame bitbuffer
1636          */
1637         if(!process_subframes_(encoder, is_last_frame)) {
1638                 /* the above function sets the state for us in case of an error */
1639                 return false;
1640         }
1641
1642         /*
1643          * Zero-pad the frame to a byte_boundary
1644          */
1645         if(!FLAC__bitbuffer_zero_pad_to_byte_boundary(encoder->private_->frame)) {
1646                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
1647                 return false;
1648         }
1649
1650         /*
1651          * CRC-16 the whole thing
1652          */
1653         FLAC__ASSERT(FLAC__bitbuffer_is_byte_aligned(encoder->private_->frame));
1654         FLAC__bitbuffer_write_raw_uint32(encoder->private_->frame, FLAC__bitbuffer_get_write_crc16(encoder->private_->frame), FLAC__FRAME_FOOTER_CRC_LEN);
1655
1656         /*
1657          * Write it
1658          */
1659         if(!write_bitbuffer_(encoder, encoder->protected_->blocksize)) {
1660                 /* the above function sets the state for us in case of an error */
1661                 return false;
1662         }
1663
1664         /*
1665          * Get ready for the next frame
1666          */
1667         encoder->private_->current_sample_number = 0;
1668         encoder->private_->current_frame_number++;
1669         encoder->private_->metadata.data.stream_info.total_samples += (FLAC__uint64)encoder->protected_->blocksize;
1670
1671         return true;
1672 }
1673
1674 FLAC__bool process_subframes_(FLAC__StreamEncoder *encoder, FLAC__bool is_last_frame)
1675 {
1676         FLAC__FrameHeader frame_header;
1677         unsigned channel, min_partition_order = encoder->protected_->min_residual_partition_order, max_partition_order;
1678         FLAC__bool do_independent, do_mid_side, precompute_partition_sums;
1679
1680         /*
1681          * Calculate the min,max Rice partition orders
1682          */
1683         if(is_last_frame) {
1684                 max_partition_order = 0;
1685         }
1686         else {
1687                 max_partition_order = FLAC__format_get_max_rice_partition_order_from_blocksize(encoder->protected_->blocksize);
1688                 max_partition_order = min(max_partition_order, encoder->protected_->max_residual_partition_order);
1689         }
1690         min_partition_order = min(min_partition_order, max_partition_order);
1691
1692         precompute_partition_sums = encoder->private_->precompute_partition_sums && ((max_partition_order > min_partition_order) || encoder->protected_->do_escape_coding);
1693
1694         /*
1695          * Setup the frame
1696          */
1697         if(!FLAC__bitbuffer_clear(encoder->private_->frame)) {
1698                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
1699                 return false;
1700         }
1701         frame_header.blocksize = encoder->protected_->blocksize;
1702         frame_header.sample_rate = encoder->protected_->sample_rate;
1703         frame_header.channels = encoder->protected_->channels;
1704         frame_header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT; /* the default unless the encoder determines otherwise */
1705         frame_header.bits_per_sample = encoder->protected_->bits_per_sample;
1706         frame_header.number_type = FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER;
1707         frame_header.number.frame_number = encoder->private_->current_frame_number;
1708
1709         /*
1710          * Figure out what channel assignments to try
1711          */
1712         if(encoder->protected_->do_mid_side_stereo) {
1713                 if(encoder->protected_->loose_mid_side_stereo) {
1714                         if(encoder->private_->loose_mid_side_stereo_frame_count == 0) {
1715                                 do_independent = true;
1716                                 do_mid_side = true;
1717                         }
1718                         else {
1719                                 do_independent = (encoder->private_->last_channel_assignment == FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT);
1720                                 do_mid_side = !do_independent;
1721                         }
1722                 }
1723                 else {
1724                         do_independent = true;
1725                         do_mid_side = true;
1726                 }
1727         }
1728         else {
1729                 do_independent = true;
1730                 do_mid_side = false;
1731         }
1732
1733         FLAC__ASSERT(do_independent || do_mid_side);
1734
1735         /*
1736          * Check for wasted bits; set effective bps for each subframe
1737          */
1738         if(do_independent) {
1739                 for(channel = 0; channel < encoder->protected_->channels; channel++) {
1740                         const unsigned w = get_wasted_bits_(encoder->private_->integer_signal[channel], encoder->protected_->blocksize);
1741                         encoder->private_->subframe_workspace[channel][0].wasted_bits = encoder->private_->subframe_workspace[channel][1].wasted_bits = w;
1742                         encoder->private_->subframe_bps[channel] = encoder->protected_->bits_per_sample - w;
1743                 }
1744         }
1745         if(do_mid_side) {
1746                 FLAC__ASSERT(encoder->protected_->channels == 2);
1747                 for(channel = 0; channel < 2; channel++) {
1748                         const unsigned w = get_wasted_bits_(encoder->private_->integer_signal_mid_side[channel], encoder->protected_->blocksize);
1749                         encoder->private_->subframe_workspace_mid_side[channel][0].wasted_bits = encoder->private_->subframe_workspace_mid_side[channel][1].wasted_bits = w;
1750                         encoder->private_->subframe_bps_mid_side[channel] = encoder->protected_->bits_per_sample - w + (channel==0? 0:1);
1751                 }
1752         }
1753
1754         /*
1755          * First do a normal encoding pass of each independent channel
1756          */
1757         if(do_independent) {
1758                 for(channel = 0; channel < encoder->protected_->channels; channel++) {
1759                         if(!
1760                                 process_subframe_(
1761                                         encoder,
1762                                         min_partition_order,
1763                                         max_partition_order,
1764                                         precompute_partition_sums,
1765                                         &frame_header,
1766                                         encoder->private_->subframe_bps[channel],
1767                                         encoder->private_->integer_signal[channel],
1768                                         encoder->private_->real_signal[channel],
1769                                         encoder->private_->subframe_workspace_ptr[channel],
1770                                         encoder->private_->partitioned_rice_contents_workspace_ptr[channel],
1771                                         encoder->private_->residual_workspace[channel],
1772                                         encoder->private_->best_subframe+channel,
1773                                         encoder->private_->best_subframe_bits+channel
1774                                 )
1775                         )
1776                                 return false;
1777                 }
1778         }
1779
1780         /*
1781          * Now do mid and side channels if requested
1782          */
1783         if(do_mid_side) {
1784                 FLAC__ASSERT(encoder->protected_->channels == 2);
1785
1786                 for(channel = 0; channel < 2; channel++) {
1787                         if(!
1788                                 process_subframe_(
1789                                         encoder,
1790                                         min_partition_order,
1791                                         max_partition_order,
1792                                         precompute_partition_sums,
1793                                         &frame_header,
1794                                         encoder->private_->subframe_bps_mid_side[channel],
1795                                         encoder->private_->integer_signal_mid_side[channel],
1796                                         encoder->private_->real_signal_mid_side[channel],
1797                                         encoder->private_->subframe_workspace_ptr_mid_side[channel],
1798                                         encoder->private_->partitioned_rice_contents_workspace_ptr_mid_side[channel],
1799                                         encoder->private_->residual_workspace_mid_side[channel],
1800                                         encoder->private_->best_subframe_mid_side+channel,
1801                                         encoder->private_->best_subframe_bits_mid_side+channel
1802                                 )
1803                         )
1804                                 return false;
1805                 }
1806         }
1807
1808         /*
1809          * Compose the frame bitbuffer
1810          */
1811         if(do_mid_side) {
1812                 unsigned left_bps = 0, right_bps = 0; /* initialized only to prevent superfluous compiler warning */
1813                 FLAC__Subframe *left_subframe = 0, *right_subframe = 0; /* initialized only to prevent superfluous compiler warning */
1814                 FLAC__ChannelAssignment channel_assignment;
1815
1816                 FLAC__ASSERT(encoder->protected_->channels == 2);
1817
1818                 if(encoder->protected_->loose_mid_side_stereo && encoder->private_->loose_mid_side_stereo_frame_count > 0) {
1819                         channel_assignment = (encoder->private_->last_channel_assignment == FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT? FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT : FLAC__CHANNEL_ASSIGNMENT_MID_SIDE);
1820                 }
1821                 else {
1822                         unsigned bits[4]; /* WATCHOUT - indexed by FLAC__ChannelAssignment */
1823                         unsigned min_bits;
1824                         FLAC__ChannelAssignment ca;
1825
1826                         FLAC__ASSERT(do_independent && do_mid_side);
1827
1828                         /* We have to figure out which channel assignent results in the smallest frame */
1829                         bits[FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT] = encoder->private_->best_subframe_bits         [0] + encoder->private_->best_subframe_bits         [1];
1830                         bits[FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE  ] = encoder->private_->best_subframe_bits         [0] + encoder->private_->best_subframe_bits_mid_side[1];
1831                         bits[FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE ] = encoder->private_->best_subframe_bits         [1] + encoder->private_->best_subframe_bits_mid_side[1];
1832                         bits[FLAC__CHANNEL_ASSIGNMENT_MID_SIDE   ] = encoder->private_->best_subframe_bits_mid_side[0] + encoder->private_->best_subframe_bits_mid_side[1];
1833
1834                         for(channel_assignment = 0, min_bits = bits[0], ca = 1; ca <= 3; ca++) {
1835                                 if(bits[ca] < min_bits) {
1836                                         min_bits = bits[ca];
1837                                         channel_assignment = ca;
1838                                 }
1839                         }
1840                 }
1841
1842                 frame_header.channel_assignment = channel_assignment;
1843
1844                 if(!FLAC__frame_add_header(&frame_header, encoder->protected_->streamable_subset, is_last_frame, encoder->private_->frame)) {
1845                         encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
1846                         return false;
1847                 }
1848
1849                 switch(channel_assignment) {
1850                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1851                                 left_subframe  = &encoder->private_->subframe_workspace         [0][encoder->private_->best_subframe         [0]];
1852                                 right_subframe = &encoder->private_->subframe_workspace         [1][encoder->private_->best_subframe         [1]];
1853                                 break;
1854                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1855                                 left_subframe  = &encoder->private_->subframe_workspace         [0][encoder->private_->best_subframe         [0]];
1856                                 right_subframe = &encoder->private_->subframe_workspace_mid_side[1][encoder->private_->best_subframe_mid_side[1]];
1857                                 break;
1858                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1859                                 left_subframe  = &encoder->private_->subframe_workspace_mid_side[1][encoder->private_->best_subframe_mid_side[1]];
1860                                 right_subframe = &encoder->private_->subframe_workspace         [1][encoder->private_->best_subframe         [1]];
1861                                 break;
1862                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1863                                 left_subframe  = &encoder->private_->subframe_workspace_mid_side[0][encoder->private_->best_subframe_mid_side[0]];
1864                                 right_subframe = &encoder->private_->subframe_workspace_mid_side[1][encoder->private_->best_subframe_mid_side[1]];
1865                                 break;
1866                         default:
1867                                 FLAC__ASSERT(0);
1868                 }
1869
1870                 switch(channel_assignment) {
1871                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1872                                 left_bps  = encoder->private_->subframe_bps         [0];
1873                                 right_bps = encoder->private_->subframe_bps         [1];
1874                                 break;
1875                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1876                                 left_bps  = encoder->private_->subframe_bps         [0];
1877                                 right_bps = encoder->private_->subframe_bps_mid_side[1];
1878                                 break;
1879                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1880                                 left_bps  = encoder->private_->subframe_bps_mid_side[1];
1881                                 right_bps = encoder->private_->subframe_bps         [1];
1882                                 break;
1883                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1884                                 left_bps  = encoder->private_->subframe_bps_mid_side[0];
1885                                 right_bps = encoder->private_->subframe_bps_mid_side[1];
1886                                 break;
1887                         default:
1888                                 FLAC__ASSERT(0);
1889                 }
1890
1891                 /* note that encoder_add_subframe_ sets the state for us in case of an error */
1892                 if(!add_subframe_(encoder, &frame_header, left_bps , left_subframe , encoder->private_->frame))
1893                         return false;
1894                 if(!add_subframe_(encoder, &frame_header, right_bps, right_subframe, encoder->private_->frame))
1895                         return false;
1896         }
1897         else {
1898                 if(!FLAC__frame_add_header(&frame_header, encoder->protected_->streamable_subset, is_last_frame, encoder->private_->frame)) {
1899                         encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
1900                         return false;
1901                 }
1902
1903                 for(channel = 0; channel < encoder->protected_->channels; channel++) {
1904                         if(!add_subframe_(encoder, &frame_header, encoder->private_->subframe_bps[channel], &encoder->private_->subframe_workspace[channel][encoder->private_->best_subframe[channel]], encoder->private_->frame)) {
1905                                 /* the above function sets the state for us in case of an error */
1906                                 return false;
1907                         }
1908                 }
1909         }
1910
1911         if(encoder->protected_->loose_mid_side_stereo) {
1912                 encoder->private_->loose_mid_side_stereo_frame_count++;
1913                 if(encoder->private_->loose_mid_side_stereo_frame_count >= encoder->private_->loose_mid_side_stereo_frames)
1914                         encoder->private_->loose_mid_side_stereo_frame_count = 0;
1915         }
1916
1917         encoder->private_->last_channel_assignment = frame_header.channel_assignment;
1918
1919         return true;
1920 }
1921
1922 FLAC__bool process_subframe_(
1923         FLAC__StreamEncoder *encoder,
1924         unsigned min_partition_order,
1925         unsigned max_partition_order,
1926         FLAC__bool precompute_partition_sums,
1927         const FLAC__FrameHeader *frame_header,
1928         unsigned subframe_bps,
1929         const FLAC__int32 integer_signal[],
1930         const FLAC__real real_signal[],
1931         FLAC__Subframe *subframe[2],
1932         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents[2],
1933         FLAC__int32 *residual[2],
1934         unsigned *best_subframe,
1935         unsigned *best_bits
1936 )
1937 {
1938         FLAC__real fixed_residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1];
1939         FLAC__real lpc_residual_bits_per_sample;
1940         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 */
1941         FLAC__real lpc_error[FLAC__MAX_LPC_ORDER];
1942         unsigned min_lpc_order, max_lpc_order, lpc_order;
1943         unsigned min_fixed_order, max_fixed_order, guess_fixed_order, fixed_order;
1944         unsigned min_qlp_coeff_precision, max_qlp_coeff_precision, qlp_coeff_precision;
1945         unsigned rice_parameter;
1946         unsigned _candidate_bits, _best_bits;
1947         unsigned _best_subframe;
1948
1949         /* verbatim subframe is the baseline against which we measure other compressed subframes */
1950         _best_subframe = 0;
1951         if(encoder->private_->disable_verbatim_subframes && frame_header->blocksize >= FLAC__MAX_FIXED_ORDER)
1952                 _best_bits = UINT_MAX;
1953         else
1954                 _best_bits = evaluate_verbatim_subframe_(integer_signal, frame_header->blocksize, subframe_bps, subframe[_best_subframe]);
1955
1956         if(frame_header->blocksize >= FLAC__MAX_FIXED_ORDER) {
1957                 unsigned signal_is_constant = false;
1958                 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);
1959                 /* check for constant subframe */
1960                 if(!encoder->private_->disable_constant_subframes && fixed_residual_bits_per_sample[1] == 0.0) {
1961                         /* the above means integer_signal+FLAC__MAX_FIXED_ORDER is constant, now we just have to check the warmup samples */
1962                         unsigned i;
1963                         signal_is_constant = true;
1964                         for(i = 1; i <= FLAC__MAX_FIXED_ORDER; i++) {
1965                                 if(integer_signal[0] != integer_signal[i]) {
1966                                         signal_is_constant = false;
1967                                         break;
1968                                 }
1969                         }
1970                 }
1971                 if(signal_is_constant) {
1972                         _candidate_bits = evaluate_constant_subframe_(integer_signal[0], subframe_bps, subframe[!_best_subframe]);
1973                         if(_candidate_bits < _best_bits) {
1974                                 _best_subframe = !_best_subframe;
1975                                 _best_bits = _candidate_bits;
1976                         }
1977                 }
1978                 else {
1979                         if(!encoder->private_->disable_fixed_subframes || (encoder->protected_->max_lpc_order == 0 && _best_bits == UINT_MAX)) {
1980                                 /* encode fixed */
1981                                 if(encoder->protected_->do_exhaustive_model_search) {
1982                                         min_fixed_order = 0;
1983                                         max_fixed_order = FLAC__MAX_FIXED_ORDER;
1984                                 }
1985                                 else {
1986                                         min_fixed_order = max_fixed_order = guess_fixed_order;
1987                                 }
1988                                 for(fixed_order = min_fixed_order; fixed_order <= max_fixed_order; fixed_order++) {
1989                                         if(fixed_residual_bits_per_sample[fixed_order] >= (FLAC__real)subframe_bps)
1990                                                 continue; /* don't even try */
1991                                         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 */
1992 #ifndef FLAC__SYMMETRIC_RICE
1993                                         rice_parameter++; /* to account for the signed->unsigned conversion during rice coding */
1994 #endif
1995                                         if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1996 #ifdef DEBUG_VERBOSE
1997                                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @0\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1998 #endif
1999                                                 rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
2000                                         }
2001                                         _candidate_bits =
2002                                                 evaluate_fixed_subframe_(
2003                                                         encoder,
2004                                                         integer_signal,
2005                                                         residual[!_best_subframe],
2006                                                         encoder->private_->abs_residual,
2007                                                         encoder->private_->abs_residual_partition_sums,
2008                                                         encoder->private_->raw_bits_per_partition,
2009                                                         frame_header->blocksize,
2010                                                         subframe_bps,
2011                                                         fixed_order,
2012                                                         rice_parameter,
2013                                                         min_partition_order,
2014                                                         max_partition_order,
2015                                                         precompute_partition_sums,
2016                                                         encoder->protected_->do_escape_coding,
2017                                                         encoder->protected_->rice_parameter_search_dist,
2018                                                         subframe[!_best_subframe],
2019                                                         partitioned_rice_contents[!_best_subframe]
2020                                                 );
2021                                         if(_candidate_bits < _best_bits) {
2022                                                 _best_subframe = !_best_subframe;
2023                                                 _best_bits = _candidate_bits;
2024                                         }
2025                                 }
2026                         }
2027
2028                         /* encode lpc */
2029                         if(encoder->protected_->max_lpc_order > 0) {
2030                                 if(encoder->protected_->max_lpc_order >= frame_header->blocksize)
2031                                         max_lpc_order = frame_header->blocksize-1;
2032                                 else
2033                                         max_lpc_order = encoder->protected_->max_lpc_order;
2034                                 if(max_lpc_order > 0) {
2035                                         encoder->private_->local_lpc_compute_autocorrelation(real_signal, frame_header->blocksize, max_lpc_order+1, autoc);
2036                                         /* if autoc[0] == 0.0, the signal is constant and we usually won't get here, but it can happen */
2037                                         if(autoc[0] != 0.0) {
2038                                                 FLAC__lpc_compute_lp_coefficients(autoc, max_lpc_order, encoder->private_->lp_coeff, lpc_error);
2039                                                 if(encoder->protected_->do_exhaustive_model_search) {
2040                                                         min_lpc_order = 1;
2041                                                 }
2042                                                 else {
2043                                                         unsigned guess_lpc_order = FLAC__lpc_compute_best_order(lpc_error, max_lpc_order, frame_header->blocksize, subframe_bps);
2044                                                         min_lpc_order = max_lpc_order = guess_lpc_order;
2045                                                 }
2046                                                 for(lpc_order = min_lpc_order; lpc_order <= max_lpc_order; lpc_order++) {
2047                                                         lpc_residual_bits_per_sample = FLAC__lpc_compute_expected_bits_per_residual_sample(lpc_error[lpc_order-1], frame_header->blocksize-lpc_order);
2048                                                         if(lpc_residual_bits_per_sample >= (FLAC__real)subframe_bps)
2049                                                                 continue; /* don't even try */
2050                                                         rice_parameter = (lpc_residual_bits_per_sample > 0.0)? (unsigned)(lpc_residual_bits_per_sample+0.5) : 0; /* 0.5 is for rounding */
2051 #ifndef FLAC__SYMMETRIC_RICE
2052                                                         rice_parameter++; /* to account for the signed->unsigned conversion during rice coding */
2053 #endif
2054                                                         if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
2055 #ifdef DEBUG_VERBOSE
2056                                                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @1\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
2057 #endif
2058                                                                 rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
2059                                                         }
2060                                                         if(encoder->protected_->do_qlp_coeff_prec_search) {
2061                                                                 min_qlp_coeff_precision = FLAC__MIN_QLP_COEFF_PRECISION;
2062                                                                 /* ensure a 32-bit datapath throughout for 16bps or less */
2063                                                                 if(subframe_bps <= 16)
2064                                                                         max_qlp_coeff_precision = min(32 - subframe_bps - lpc_order, FLAC__MAX_QLP_COEFF_PRECISION);
2065                                                                 else
2066                                                                         max_qlp_coeff_precision = FLAC__MAX_QLP_COEFF_PRECISION;
2067                                                         }
2068                                                         else {
2069                                                                 min_qlp_coeff_precision = max_qlp_coeff_precision = encoder->protected_->qlp_coeff_precision;
2070                                                         }
2071                                                         for(qlp_coeff_precision = min_qlp_coeff_precision; qlp_coeff_precision <= max_qlp_coeff_precision; qlp_coeff_precision++) {
2072                                                                 _candidate_bits =
2073                                                                         evaluate_lpc_subframe_(
2074                                                                                 encoder,
2075                                                                                 integer_signal,
2076                                                                                 residual[!_best_subframe],
2077                                                                                 encoder->private_->abs_residual,
2078                                                                                 encoder->private_->abs_residual_partition_sums,
2079                                                                                 encoder->private_->raw_bits_per_partition,
2080                                                                                 encoder->private_->lp_coeff[lpc_order-1],
2081                                                                                 frame_header->blocksize,
2082                                                                                 subframe_bps,
2083                                                                                 lpc_order,
2084                                                                                 qlp_coeff_precision,
2085                                                                                 rice_parameter,
2086                                                                                 min_partition_order,
2087                                                                                 max_partition_order,
2088                                                                                 precompute_partition_sums,
2089                                                                                 encoder->protected_->do_escape_coding,
2090                                                                                 encoder->protected_->rice_parameter_search_dist,
2091                                                                                 subframe[!_best_subframe],
2092                                                                                 partitioned_rice_contents[!_best_subframe]
2093                                                                         );
2094                                                                 if(_candidate_bits > 0) { /* if == 0, there was a problem quantizing the lpcoeffs */
2095                                                                         if(_candidate_bits < _best_bits) {
2096                                                                                 _best_subframe = !_best_subframe;
2097                                                                                 _best_bits = _candidate_bits;
2098                                                                         }
2099                                                                 }
2100                                                         }
2101                                                 }
2102                                         }
2103                                 }
2104                         }
2105                 }
2106         }
2107
2108         /* under rare circumstances this can happen when all but lpc subframe types are disabled: */
2109         if(_best_bits == UINT_MAX) {
2110                 FLAC__ASSERT(_best_subframe == 0);
2111                 _best_bits = evaluate_verbatim_subframe_(integer_signal, frame_header->blocksize, subframe_bps, subframe[_best_subframe]);
2112         }
2113
2114         *best_subframe = _best_subframe;
2115         *best_bits = _best_bits;
2116
2117         return true;
2118 }
2119
2120 FLAC__bool add_subframe_(
2121         FLAC__StreamEncoder *encoder,
2122         const FLAC__FrameHeader *frame_header,
2123         unsigned subframe_bps,
2124         const FLAC__Subframe *subframe,
2125         FLAC__BitBuffer *frame
2126 )
2127 {
2128         switch(subframe->type) {
2129                 case FLAC__SUBFRAME_TYPE_CONSTANT:
2130 //@@@@fprintf(stderr,"@@@@ add CONSTANT, bps=%u\n",subframe_bps);
2131                         if(!FLAC__subframe_add_constant(&(subframe->data.constant), subframe_bps, subframe->wasted_bits, frame)) {
2132                                 encoder->protected_->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING;
2133                                 return false;
2134                         }
2135                         break;
2136                 case FLAC__SUBFRAME_TYPE_FIXED:
2137 //@@@@fprintf(stderr,"@@@@ add FIXED, bps=%u, order=%u\n",subframe_bps,subframe->data.fixed.order);
2138                         if(!FLAC__subframe_add_fixed(&(subframe->data.fixed), frame_header->blocksize - subframe->data.fixed.order, subframe_bps, subframe->wasted_bits, frame)) {
2139                                 encoder->protected_->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING;
2140                                 return false;
2141                         }
2142                         break;
2143                 case FLAC__SUBFRAME_TYPE_LPC:
2144 //@@@@fprintf(stderr,"@@@@ add LPC, bps=%u, order=%u, prec=%u, shift=%d\n",subframe_bps,subframe->data.lpc.order,subframe->data.lpc.qlp_coeff_precision,subframe->data.lpc.quantization_level);
2145                         if(!FLAC__subframe_add_lpc(&(subframe->data.lpc), frame_header->blocksize - subframe->data.lpc.order, subframe_bps, subframe->wasted_bits, frame)) {
2146                                 encoder->protected_->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING;
2147                                 return false;
2148                         }
2149                         break;
2150                 case FLAC__SUBFRAME_TYPE_VERBATIM:
2151 //@@@@fprintf(stderr,"@@@@ add VERBATIM, bps=%u\n",subframe_bps);
2152                         if(!FLAC__subframe_add_verbatim(&(subframe->data.verbatim), frame_header->blocksize, subframe_bps, subframe->wasted_bits, frame)) {
2153                                 encoder->protected_->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING;
2154                                 return false;
2155                         }
2156                         break;
2157                 default:
2158                         FLAC__ASSERT(0);
2159         }
2160
2161         return true;
2162 }
2163
2164 unsigned evaluate_constant_subframe_(
2165         const FLAC__int32 signal,
2166         unsigned subframe_bps,
2167         FLAC__Subframe *subframe
2168 )
2169 {
2170         subframe->type = FLAC__SUBFRAME_TYPE_CONSTANT;
2171         subframe->data.constant.value = signal;
2172
2173         return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + subframe_bps;
2174 }
2175
2176 unsigned evaluate_fixed_subframe_(
2177         FLAC__StreamEncoder *encoder,
2178         const FLAC__int32 signal[],
2179         FLAC__int32 residual[],
2180         FLAC__uint32 abs_residual[],
2181         FLAC__uint64 abs_residual_partition_sums[],
2182         unsigned raw_bits_per_partition[],
2183         unsigned blocksize,
2184         unsigned subframe_bps,
2185         unsigned order,
2186         unsigned rice_parameter,
2187         unsigned min_partition_order,
2188         unsigned max_partition_order,
2189         FLAC__bool precompute_partition_sums,
2190         FLAC__bool do_escape_coding,
2191         unsigned rice_parameter_search_dist,
2192         FLAC__Subframe *subframe,
2193         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents
2194 )
2195 {
2196         unsigned i, residual_bits;
2197         const unsigned residual_samples = blocksize - order;
2198
2199         FLAC__fixed_compute_residual(signal+order, residual_samples, order, residual);
2200
2201         subframe->type = FLAC__SUBFRAME_TYPE_FIXED;
2202
2203         subframe->data.fixed.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE;
2204         subframe->data.fixed.entropy_coding_method.data.partitioned_rice.contents = partitioned_rice_contents;
2205         subframe->data.fixed.residual = residual;
2206
2207         residual_bits =
2208                 find_best_partition_order_(
2209                         encoder->private_,
2210                         residual,
2211                         abs_residual,
2212                         abs_residual_partition_sums,
2213                         raw_bits_per_partition,
2214                         residual_samples,
2215                         order,
2216                         rice_parameter,
2217                         min_partition_order,
2218                         max_partition_order,
2219                         precompute_partition_sums,
2220                         do_escape_coding,
2221                         rice_parameter_search_dist,
2222                         &subframe->data.fixed.entropy_coding_method.data.partitioned_rice
2223                 );
2224
2225         subframe->data.fixed.order = order;
2226         for(i = 0; i < order; i++)
2227                 subframe->data.fixed.warmup[i] = signal[i];
2228
2229         return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + (order * subframe_bps) + residual_bits;
2230 }
2231
2232 unsigned evaluate_lpc_subframe_(
2233         FLAC__StreamEncoder *encoder,
2234         const FLAC__int32 signal[],
2235         FLAC__int32 residual[],
2236         FLAC__uint32 abs_residual[],
2237         FLAC__uint64 abs_residual_partition_sums[],
2238         unsigned raw_bits_per_partition[],
2239         const FLAC__real lp_coeff[],
2240         unsigned blocksize,
2241         unsigned subframe_bps,
2242         unsigned order,
2243         unsigned qlp_coeff_precision,
2244         unsigned rice_parameter,
2245         unsigned min_partition_order,
2246         unsigned max_partition_order,
2247         FLAC__bool precompute_partition_sums,
2248         FLAC__bool do_escape_coding,
2249         unsigned rice_parameter_search_dist,
2250         FLAC__Subframe *subframe,
2251         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents
2252 )
2253 {
2254         FLAC__int32 qlp_coeff[FLAC__MAX_LPC_ORDER];
2255         unsigned i, residual_bits;
2256         int quantization, ret;
2257         const unsigned residual_samples = blocksize - order;
2258
2259         /* try to keep qlp coeff precision such that only 32-bit math is required for decode of <=16bps streams */
2260         if(subframe_bps <= 16) {
2261                 FLAC__ASSERT(order > 0);
2262                 FLAC__ASSERT(order <= FLAC__MAX_LPC_ORDER);
2263                 qlp_coeff_precision = min(qlp_coeff_precision, 32 - subframe_bps - FLAC__bitmath_ilog2(order));
2264         }
2265
2266         ret = FLAC__lpc_quantize_coefficients(lp_coeff, order, qlp_coeff_precision, qlp_coeff, &quantization);
2267         if(ret != 0)
2268                 return 0; /* this is a hack to indicate to the caller that we can't do lp at this order on this subframe */
2269
2270         if(subframe_bps <= 16 && qlp_coeff_precision <= 16)
2271                 encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit(signal+order, residual_samples, qlp_coeff, order, quantization, residual);
2272         else if(subframe_bps + qlp_coeff_precision + order <= 32)
2273                 encoder->private_->local_lpc_compute_residual_from_qlp_coefficients(signal+order, residual_samples, qlp_coeff, order, quantization, residual);
2274         else
2275                 encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_64bit(signal+order, residual_samples, qlp_coeff, order, quantization, residual);
2276
2277         subframe->type = FLAC__SUBFRAME_TYPE_LPC;
2278
2279         subframe->data.lpc.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE;
2280         subframe->data.lpc.entropy_coding_method.data.partitioned_rice.contents = partitioned_rice_contents;
2281         subframe->data.lpc.residual = residual;
2282
2283         residual_bits =
2284                 find_best_partition_order_(
2285                         encoder->private_,
2286                         residual,
2287                         abs_residual,
2288                         abs_residual_partition_sums,
2289                         raw_bits_per_partition,
2290                         residual_samples,
2291                         order,
2292                         rice_parameter,
2293                         min_partition_order,
2294                         max_partition_order,
2295                         precompute_partition_sums,
2296                         do_escape_coding,
2297                         rice_parameter_search_dist,
2298                         &subframe->data.fixed.entropy_coding_method.data.partitioned_rice
2299                 );
2300
2301         subframe->data.lpc.order = order;
2302         subframe->data.lpc.qlp_coeff_precision = qlp_coeff_precision;
2303         subframe->data.lpc.quantization_level = quantization;
2304         memcpy(subframe->data.lpc.qlp_coeff, qlp_coeff, sizeof(FLAC__int32)*FLAC__MAX_LPC_ORDER);
2305         for(i = 0; i < order; i++)
2306                 subframe->data.lpc.warmup[i] = signal[i];
2307
2308         return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN + FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN + (order * (qlp_coeff_precision + subframe_bps)) + residual_bits;
2309 }
2310
2311 unsigned evaluate_verbatim_subframe_(
2312         const FLAC__int32 signal[],
2313         unsigned blocksize,
2314         unsigned subframe_bps,
2315         FLAC__Subframe *subframe
2316 )
2317 {
2318         subframe->type = FLAC__SUBFRAME_TYPE_VERBATIM;
2319
2320         subframe->data.verbatim.data = signal;
2321
2322         return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + (blocksize * subframe_bps);
2323 }
2324
2325 unsigned find_best_partition_order_(
2326         FLAC__StreamEncoderPrivate *private_,
2327         const FLAC__int32 residual[],
2328         FLAC__uint32 abs_residual[],
2329         FLAC__uint64 abs_residual_partition_sums[],
2330         unsigned raw_bits_per_partition[],
2331         unsigned residual_samples,
2332         unsigned predictor_order,
2333         unsigned rice_parameter,
2334         unsigned min_partition_order,
2335         unsigned max_partition_order,
2336         FLAC__bool precompute_partition_sums,
2337         FLAC__bool do_escape_coding,
2338         unsigned rice_parameter_search_dist,
2339         FLAC__EntropyCodingMethod_PartitionedRice *best_partitioned_rice
2340 )
2341 {
2342         FLAC__int32 r;
2343         unsigned residual_bits, best_residual_bits = 0;
2344         unsigned residual_sample;
2345         unsigned best_parameters_index = 0;
2346         const unsigned blocksize = residual_samples + predictor_order;
2347
2348         /* compute abs(residual) for use later */
2349         for(residual_sample = 0; residual_sample < residual_samples; residual_sample++) {
2350                 r = residual[residual_sample];
2351                 abs_residual[residual_sample] = (FLAC__uint32)(r<0? -r : r);
2352         }
2353
2354         max_partition_order = FLAC__format_get_max_rice_partition_order_from_blocksize_limited_max_and_predictor_order(max_partition_order, blocksize, predictor_order);
2355         min_partition_order = min(min_partition_order, max_partition_order);
2356
2357         if(precompute_partition_sums) {
2358                 int partition_order;
2359                 unsigned sum;
2360
2361                 precompute_partition_info_sums_(abs_residual, abs_residual_partition_sums, residual_samples, predictor_order, min_partition_order, max_partition_order);
2362
2363                 if(do_escape_coding)
2364                         precompute_partition_info_escapes_(residual, raw_bits_per_partition, residual_samples, predictor_order, min_partition_order, max_partition_order);
2365
2366                 for(partition_order = (int)max_partition_order, sum = 0; partition_order >= (int)min_partition_order; partition_order--) {
2367 #ifdef DONT_ESTIMATE_RICE_BITS
2368                         if(!
2369                                 set_partitioned_rice_with_precompute_(
2370                                         residual,
2371                                         abs_residual_partition_sums+sum,
2372                                         raw_bits_per_partition+sum,
2373                                         residual_samples,
2374                                         predictor_order,
2375                                         rice_parameter,
2376                                         rice_parameter_search_dist,
2377                                         (unsigned)partition_order,
2378                                         do_escape_coding,
2379                                         &private_->partitioned_rice_contents_extra[!best_parameters_index],
2380                                         &residual_bits
2381                                 )
2382                         )
2383 #else
2384                         if(!
2385                                 set_partitioned_rice_with_precompute_(
2386                                         abs_residual,
2387                                         abs_residual_partition_sums+sum,
2388                                         raw_bits_per_partition+sum,
2389                                         residual_samples,
2390                                         predictor_order,
2391                                         rice_parameter,
2392                                         rice_parameter_search_dist,
2393                                         (unsigned)partition_order,
2394                                         do_escape_coding,
2395                                         &private_->partitioned_rice_contents_extra[!best_parameters_index],
2396                                         &residual_bits
2397                                 )
2398                         )
2399 #endif
2400                         {
2401                                 FLAC__ASSERT(best_residual_bits != 0);
2402                                 break;
2403                         }
2404                         sum += 1u << partition_order;
2405                         if(best_residual_bits == 0 || residual_bits < best_residual_bits) {
2406                                 best_residual_bits = residual_bits;
2407                                 best_parameters_index = !best_parameters_index;
2408                                 best_partitioned_rice->order = partition_order;
2409                         }
2410                 }
2411         }
2412         else {
2413                 unsigned partition_order;
2414                 for(partition_order = min_partition_order; partition_order <= max_partition_order; partition_order++) {
2415 #ifdef DONT_ESTIMATE_RICE_BITS
2416                         if(!
2417                                 set_partitioned_rice_(
2418                                         abs_residual,
2419                                         residual,
2420                                         residual_samples,
2421                                         predictor_order,
2422                                         rice_parameter,
2423                                         rice_parameter_search_dist,
2424                                         partition_order,
2425                                         &private_->partitioned_rice_contents_extra[!best_parameters_index],
2426                                         &residual_bits
2427                                 )
2428                         )
2429 #else
2430                         if(!
2431                                 set_partitioned_rice_(
2432                                         abs_residual,
2433                                         residual_samples,
2434                                         predictor_order,
2435                                         rice_parameter,
2436                                         rice_parameter_search_dist,
2437                                         partition_order,
2438                                         &private_->partitioned_rice_contents_extra[!best_parameters_index],
2439                                         &residual_bits
2440                                 )
2441                         )
2442 #endif
2443                         {
2444                                 FLAC__ASSERT(best_residual_bits != 0);
2445                                 break;
2446                         }
2447                         if(best_residual_bits == 0 || residual_bits < best_residual_bits) {
2448                                 best_residual_bits = residual_bits;
2449                                 best_parameters_index = !best_parameters_index;
2450                                 best_partitioned_rice->order = partition_order;
2451                         }
2452                 }
2453         }
2454
2455         /*
2456          * We are allowed to de-const the pointer based on our special knowledge;
2457          * it is const to the outside world.
2458          */
2459         {
2460                 FLAC__EntropyCodingMethod_PartitionedRiceContents* best_partitioned_rice_contents = (FLAC__EntropyCodingMethod_PartitionedRiceContents*)best_partitioned_rice->contents;
2461                 FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(best_partitioned_rice_contents, max(6, best_partitioned_rice->order));
2462                 memcpy(best_partitioned_rice_contents->parameters, private_->partitioned_rice_contents_extra[best_parameters_index].parameters, sizeof(unsigned)*(1<<(best_partitioned_rice->order)));
2463                 memcpy(best_partitioned_rice_contents->raw_bits, private_->partitioned_rice_contents_extra[best_parameters_index].raw_bits, sizeof(unsigned)*(1<<(best_partitioned_rice->order)));
2464         }
2465
2466         return best_residual_bits;
2467 }
2468
2469 void precompute_partition_info_sums_(
2470         const FLAC__uint32 abs_residual[],
2471         FLAC__uint64 abs_residual_partition_sums[],
2472         unsigned residual_samples,
2473         unsigned predictor_order,
2474         unsigned min_partition_order,
2475         unsigned max_partition_order
2476 )
2477 {
2478         int partition_order;
2479         unsigned from_partition, to_partition = 0;
2480         const unsigned blocksize = residual_samples + predictor_order;
2481
2482         /* first do max_partition_order */
2483         for(partition_order = (int)max_partition_order; partition_order >= 0; partition_order--) {
2484                 FLAC__uint64 abs_residual_partition_sum;
2485                 FLAC__uint32 abs_r;
2486                 unsigned partition, partition_sample, partition_samples, residual_sample;
2487                 const unsigned partitions = 1u << partition_order;
2488                 const unsigned default_partition_samples = blocksize >> partition_order;
2489
2490                 FLAC__ASSERT(default_partition_samples > predictor_order);
2491
2492                 for(partition = residual_sample = 0; partition < partitions; partition++) {
2493                         partition_samples = default_partition_samples;
2494                         if(partition == 0)
2495                                 partition_samples -= predictor_order;
2496                         abs_residual_partition_sum = 0;
2497                         for(partition_sample = 0; partition_sample < partition_samples; partition_sample++) {
2498                                 abs_r = abs_residual[residual_sample];
2499                                 abs_residual_partition_sum += abs_r;
2500                                 residual_sample++;
2501                         }
2502                         abs_residual_partition_sums[partition] = abs_residual_partition_sum;
2503                 }
2504                 to_partition = partitions;
2505                 break;
2506         }
2507
2508         /* now merge partitions for lower orders */
2509         for(from_partition = 0, --partition_order; partition_order >= (int)min_partition_order; partition_order--) {
2510                 FLAC__uint64 s;
2511                 unsigned i;
2512                 const unsigned partitions = 1u << partition_order;
2513                 for(i = 0; i < partitions; i++) {
2514                         s = abs_residual_partition_sums[from_partition];
2515                         from_partition++;
2516                         abs_residual_partition_sums[to_partition] = s + abs_residual_partition_sums[from_partition];
2517                         from_partition++;
2518                         to_partition++;
2519                 }
2520         }
2521 }
2522
2523 void precompute_partition_info_escapes_(
2524         const FLAC__int32 residual[],
2525         unsigned raw_bits_per_partition[],
2526         unsigned residual_samples,
2527         unsigned predictor_order,
2528         unsigned min_partition_order,
2529         unsigned max_partition_order
2530 )
2531 {
2532         int partition_order;
2533         unsigned from_partition, to_partition = 0;
2534         const unsigned blocksize = residual_samples + predictor_order;
2535
2536         /* first do max_partition_order */
2537         for(partition_order = (int)max_partition_order; partition_order >= 0; partition_order--) {
2538                 FLAC__int32 r, residual_partition_min, residual_partition_max;
2539                 unsigned silog2_min, silog2_max;
2540                 unsigned partition, partition_sample, partition_samples, residual_sample;
2541                 const unsigned partitions = 1u << partition_order;
2542                 const unsigned default_partition_samples = blocksize >> partition_order;
2543
2544                 FLAC__ASSERT(default_partition_samples > predictor_order);
2545
2546                 for(partition = residual_sample = 0; partition < partitions; partition++) {
2547                         partition_samples = default_partition_samples;
2548                         if(partition == 0)
2549                                 partition_samples -= predictor_order;
2550                         residual_partition_min = residual_partition_max = 0;
2551                         for(partition_sample = 0; partition_sample < partition_samples; partition_sample++) {
2552                                 r = residual[residual_sample];
2553                                 if(r < residual_partition_min)
2554                                         residual_partition_min = r;
2555                                 else if(r > residual_partition_max)
2556                                         residual_partition_max = r;
2557                                 residual_sample++;
2558                         }
2559                         silog2_min = FLAC__bitmath_silog2(residual_partition_min);
2560                         silog2_max = FLAC__bitmath_silog2(residual_partition_max);
2561                         raw_bits_per_partition[partition] = max(silog2_min, silog2_max);
2562                 }
2563                 to_partition = partitions;
2564                 break;
2565         }
2566
2567         /* now merge partitions for lower orders */
2568         for(from_partition = 0, --partition_order; partition_order >= (int)min_partition_order; partition_order--) {
2569                 unsigned m;
2570                 unsigned i;
2571                 const unsigned partitions = 1u << partition_order;
2572                 for(i = 0; i < partitions; i++) {
2573                         m = raw_bits_per_partition[from_partition];
2574                         from_partition++;
2575                         raw_bits_per_partition[to_partition] = max(m, raw_bits_per_partition[from_partition]);
2576                         from_partition++;
2577                         to_partition++;
2578                 }
2579         }
2580 }
2581
2582 #ifdef VARIABLE_RICE_BITS
2583 #undef VARIABLE_RICE_BITS
2584 #endif
2585 #ifndef DONT_ESTIMATE_RICE_BITS
2586 #define VARIABLE_RICE_BITS(value, parameter) ((value) >> (parameter))
2587 #endif
2588
2589 #ifdef DONT_ESTIMATE_RICE_BITS
2590 FLAC__bool set_partitioned_rice_(
2591         const FLAC__uint32 abs_residual[],
2592         const FLAC__int32 residual[],
2593         const unsigned residual_samples,
2594         const unsigned predictor_order,
2595         const unsigned suggested_rice_parameter,
2596         const unsigned rice_parameter_search_dist,
2597         const unsigned partition_order,
2598         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents,
2599         unsigned *bits
2600 )
2601 #else
2602 FLAC__bool set_partitioned_rice_(
2603         const FLAC__uint32 abs_residual[],
2604         const unsigned residual_samples,
2605         const unsigned predictor_order,
2606         const unsigned suggested_rice_parameter,
2607         const unsigned rice_parameter_search_dist,
2608         const unsigned partition_order,
2609         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents,
2610         unsigned *bits
2611 )
2612 #endif
2613 {
2614         unsigned rice_parameter, partition_bits;
2615 #ifndef NO_RICE_SEARCH
2616         unsigned best_partition_bits;
2617         unsigned min_rice_parameter, max_rice_parameter, best_rice_parameter = 0;
2618 #endif
2619         unsigned bits_ = FLAC__ENTROPY_CODING_METHOD_TYPE_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN;
2620         unsigned *parameters;
2621
2622         FLAC__ASSERT(suggested_rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER);
2623
2624         FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(partitioned_rice_contents, max(6, partition_order));
2625         parameters = partitioned_rice_contents->parameters;
2626
2627         if(partition_order == 0) {
2628                 unsigned i;
2629
2630 #ifndef NO_RICE_SEARCH
2631                 if(rice_parameter_search_dist) {
2632                         if(suggested_rice_parameter < rice_parameter_search_dist)
2633                                 min_rice_parameter = 0;
2634                         else
2635                                 min_rice_parameter = suggested_rice_parameter - rice_parameter_search_dist;
2636                         max_rice_parameter = suggested_rice_parameter + rice_parameter_search_dist;
2637                         if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
2638 #ifdef DEBUG_VERBOSE
2639                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @2\n", max_rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
2640 #endif
2641                                 max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
2642                         }
2643                 }
2644                 else
2645                         min_rice_parameter = max_rice_parameter = suggested_rice_parameter;
2646
2647                 best_partition_bits = 0xffffffff;
2648                 for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
2649 #endif
2650 #ifdef VARIABLE_RICE_BITS
2651 #ifdef FLAC__SYMMETRIC_RICE
2652                         partition_bits = (2+rice_parameter) * residual_samples;
2653 #else
2654                         const unsigned rice_parameter_estimate = rice_parameter-1;
2655                         partition_bits = (1+rice_parameter) * residual_samples;
2656 #endif
2657 #else
2658                         partition_bits = 0;
2659 #endif
2660                         partition_bits += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
2661                         for(i = 0; i < residual_samples; i++) {
2662 #ifdef VARIABLE_RICE_BITS
2663 #ifdef FLAC__SYMMETRIC_RICE
2664                                 partition_bits += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter);
2665 #else
2666                                 partition_bits += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter_estimate);
2667 #endif
2668 #else
2669                                 partition_bits += FLAC__bitbuffer_rice_bits(residual[i], rice_parameter); /* NOTE: we will need to pass in residual[] in addition to abs_residual[] */
2670 #endif
2671                         }
2672 #ifndef NO_RICE_SEARCH
2673                         if(partition_bits < best_partition_bits) {
2674                                 best_rice_parameter = rice_parameter;
2675                                 best_partition_bits = partition_bits;
2676                         }
2677                 }
2678 #endif
2679                 parameters[0] = best_rice_parameter;
2680                 bits_ += best_partition_bits;
2681         }
2682         else {
2683                 unsigned partition, residual_sample, save_residual_sample, partition_sample;
2684                 unsigned partition_samples;
2685                 FLAC__uint64 mean, k;
2686                 const unsigned partitions = 1u << partition_order;
2687                 for(partition = residual_sample = 0; partition < partitions; partition++) {
2688                         partition_samples = (residual_samples+predictor_order) >> partition_order;
2689                         if(partition == 0) {
2690                                 if(partition_samples <= predictor_order)
2691                                         return false;
2692                                 else
2693                                         partition_samples -= predictor_order;
2694                         }
2695                         mean = 0;
2696                         save_residual_sample = residual_sample;
2697                         for(partition_sample = 0; partition_sample < partition_samples; residual_sample++, partition_sample++)
2698                                 mean += abs_residual[residual_sample];
2699                         residual_sample = save_residual_sample;
2700 #ifdef FLAC__SYMMETRIC_RICE
2701                         mean += partition_samples >> 1; /* for rounding effect */
2702                         mean /= partition_samples;
2703
2704                         /* calc rice_parameter = floor(log2(mean)) */
2705                         rice_parameter = 0;
2706                         mean>>=1;
2707                         while(mean) {
2708                                 rice_parameter++;
2709                                 mean >>= 1;
2710                         }
2711 #else
2712                         /* calc rice_parameter ala LOCO-I */
2713                         for(rice_parameter = 0, k = partition_samples; k < mean; rice_parameter++, k <<= 1)
2714                                 ;
2715 #endif
2716                         if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
2717 #ifdef DEBUG_VERBOSE
2718                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @3\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
2719 #endif
2720                                 rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
2721                         }
2722
2723 #ifndef NO_RICE_SEARCH
2724                         if(rice_parameter_search_dist) {
2725                                 if(rice_parameter < rice_parameter_search_dist)
2726                                         min_rice_parameter = 0;
2727                                 else
2728                                         min_rice_parameter = rice_parameter - rice_parameter_search_dist;
2729                                 max_rice_parameter = rice_parameter + rice_parameter_search_dist;
2730                                 if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
2731 #ifdef DEBUG_VERBOSE
2732                                         fprintf(stderr, "clipping rice_parameter (%u -> %u) @4\n", max_rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
2733 #endif
2734                                         max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
2735                                 }
2736                         }
2737                         else
2738                                 min_rice_parameter = max_rice_parameter = rice_parameter;
2739
2740                         best_partition_bits = 0xffffffff;
2741                         for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
2742 #endif
2743 #ifdef VARIABLE_RICE_BITS
2744 #ifdef FLAC__SYMMETRIC_RICE
2745                                 partition_bits = (2+rice_parameter) * partition_samples;
2746 #else
2747                                 const unsigned rice_parameter_estimate = rice_parameter-1;
2748                                 partition_bits = (1+rice_parameter) * partition_samples;
2749 #endif
2750 #else
2751                                 partition_bits = 0;
2752 #endif
2753                                 partition_bits += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
2754                                 save_residual_sample = residual_sample;
2755                                 for(partition_sample = 0; partition_sample < partition_samples; residual_sample++, partition_sample++) {
2756 #ifdef VARIABLE_RICE_BITS
2757 #ifdef FLAC__SYMMETRIC_RICE
2758                                         partition_bits += VARIABLE_RICE_BITS(abs_residual[residual_sample], rice_parameter);
2759 #else
2760                                         partition_bits += VARIABLE_RICE_BITS(abs_residual[residual_sample], rice_parameter_estimate);
2761 #endif
2762 #else
2763                                         partition_bits += FLAC__bitbuffer_rice_bits(residual[residual_sample], rice_parameter); /* NOTE: we will need to pass in residual[] in addition to abs_residual[] */
2764 #endif
2765                                 }
2766 #ifndef NO_RICE_SEARCH
2767                                 if(rice_parameter != max_rice_parameter)
2768                                         residual_sample = save_residual_sample;
2769                                 if(partition_bits < best_partition_bits) {
2770                                         best_rice_parameter = rice_parameter;
2771                                         best_partition_bits = partition_bits;
2772                                 }
2773                         }
2774 #endif
2775                         parameters[partition] = best_rice_parameter;
2776                         bits_ += best_partition_bits;
2777                 }
2778         }
2779
2780         *bits = bits_;
2781         return true;
2782 }
2783
2784 #ifdef DONT_ESTIMATE_RICE_BITS
2785 FLAC__bool set_partitioned_rice_with_precompute_(
2786         const FLAC__int32 residual[],
2787         const FLAC__uint64 abs_residual_partition_sums[],
2788         const unsigned raw_bits_per_partition[],
2789         const unsigned residual_samples,
2790         const unsigned predictor_order,
2791         const unsigned suggested_rice_parameter,
2792         const unsigned rice_parameter_search_dist,
2793         const unsigned partition_order,
2794         const FLAC__bool search_for_escapes,
2795         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents,
2796         unsigned *bits
2797 )
2798 #else
2799 FLAC__bool set_partitioned_rice_with_precompute_(
2800         const FLAC__uint32 abs_residual[],
2801         const FLAC__uint64 abs_residual_partition_sums[],
2802         const unsigned raw_bits_per_partition[],
2803         const unsigned residual_samples,
2804         const unsigned predictor_order,
2805         const unsigned suggested_rice_parameter,
2806         const unsigned rice_parameter_search_dist,
2807         const unsigned partition_order,
2808         const FLAC__bool search_for_escapes,
2809         FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents,
2810         unsigned *bits
2811 )
2812 #endif
2813 {
2814         unsigned rice_parameter, partition_bits;
2815 #ifndef NO_RICE_SEARCH
2816         unsigned best_partition_bits;
2817         unsigned min_rice_parameter, max_rice_parameter, best_rice_parameter = 0;
2818 #endif
2819         unsigned flat_bits;
2820         unsigned bits_ = FLAC__ENTROPY_CODING_METHOD_TYPE_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN;
2821         unsigned *parameters, *raw_bits;
2822
2823         FLAC__ASSERT(suggested_rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER);
2824
2825         FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(partitioned_rice_contents, max(6, partition_order));
2826         parameters = partitioned_rice_contents->parameters;
2827         raw_bits = partitioned_rice_contents->raw_bits;
2828
2829         if(partition_order == 0) {
2830                 unsigned i;
2831
2832 #ifndef NO_RICE_SEARCH
2833                 if(rice_parameter_search_dist) {
2834                         if(suggested_rice_parameter < rice_parameter_search_dist)
2835                                 min_rice_parameter = 0;
2836                         else
2837                                 min_rice_parameter = suggested_rice_parameter - rice_parameter_search_dist;
2838                         max_rice_parameter = suggested_rice_parameter + rice_parameter_search_dist;
2839                         if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
2840 #ifdef DEBUG_VERBOSE
2841                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @5\n", max_rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
2842 #endif
2843                                 max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
2844                         }
2845                 }
2846                 else
2847                         min_rice_parameter = max_rice_parameter = suggested_rice_parameter;
2848
2849                 best_partition_bits = 0xffffffff;
2850                 for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
2851 #endif
2852 #ifdef VARIABLE_RICE_BITS
2853 #ifdef FLAC__SYMMETRIC_RICE
2854                         partition_bits = (2+rice_parameter) * residual_samples;
2855 #else
2856                         const unsigned rice_parameter_estimate = rice_parameter-1;
2857                         partition_bits = (1+rice_parameter) * residual_samples;
2858 #endif
2859 #else
2860                         partition_bits = 0;
2861 #endif
2862                         partition_bits += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
2863                         for(i = 0; i < residual_samples; i++) {
2864 #ifdef VARIABLE_RICE_BITS
2865 #ifdef FLAC__SYMMETRIC_RICE
2866                                 partition_bits += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter);
2867 #else
2868                                 partition_bits += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter_estimate);
2869 #endif
2870 #else
2871                                 partition_bits += FLAC__bitbuffer_rice_bits(residual[i], rice_parameter); /* NOTE: we will need to pass in residual[] instead of abs_residual[] */
2872 #endif
2873                         }
2874 #ifndef NO_RICE_SEARCH
2875                         if(partition_bits < best_partition_bits) {
2876                                 best_rice_parameter = rice_parameter;
2877                                 best_partition_bits = partition_bits;
2878                         }
2879                 }
2880 #endif
2881                 if(search_for_escapes) {
2882                         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;
2883                         if(flat_bits <= best_partition_bits) {
2884                                 raw_bits[0] = raw_bits_per_partition[0];
2885                                 best_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
2886                                 best_partition_bits = flat_bits;
2887                         }
2888                 }
2889                 parameters[0] = best_rice_parameter;
2890                 bits_ += best_partition_bits;
2891         }
2892         else {
2893                 unsigned partition, residual_sample, save_residual_sample, partition_sample;
2894                 unsigned partition_samples;
2895                 FLAC__uint64 mean, k;
2896                 const unsigned partitions = 1u << partition_order;
2897                 for(partition = residual_sample = 0; partition < partitions; partition++) {
2898                         partition_samples = (residual_samples+predictor_order) >> partition_order;
2899                         if(partition == 0) {
2900                                 if(partition_samples <= predictor_order)
2901                                         return false;
2902                                 else
2903                                         partition_samples -= predictor_order;
2904                         }
2905                         mean = abs_residual_partition_sums[partition];
2906 #ifdef FLAC__SYMMETRIC_RICE
2907                         mean += partition_samples >> 1; /* for rounding effect */
2908                         mean /= partition_samples;
2909
2910                         /* calc rice_parameter = floor(log2(mean)) */
2911                         rice_parameter = 0;
2912                         mean>>=1;
2913                         while(mean) {
2914                                 rice_parameter++;
2915                                 mean >>= 1;
2916                         }
2917 #else
2918                         /* calc rice_parameter ala LOCO-I */
2919                         for(rice_parameter = 0, k = partition_samples; k < mean; rice_parameter++, k <<= 1)
2920                                 ;
2921 #endif
2922                         if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
2923 #ifdef DEBUG_VERBOSE
2924                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @6\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
2925 #endif
2926                                 rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
2927                         }
2928
2929 #ifndef NO_RICE_SEARCH
2930                         if(rice_parameter_search_dist) {
2931                                 if(rice_parameter < rice_parameter_search_dist)
2932                                         min_rice_parameter = 0;
2933                                 else
2934                                         min_rice_parameter = rice_parameter - rice_parameter_search_dist;
2935                                 max_rice_parameter = rice_parameter + rice_parameter_search_dist;
2936                                 if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
2937 #ifdef DEBUG_VERBOSE
2938                                         fprintf(stderr, "clipping rice_parameter (%u -> %u) @7\n", max_rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
2939 #endif
2940                                         max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
2941                                 }
2942                         }
2943                         else
2944                                 min_rice_parameter = max_rice_parameter = rice_parameter;
2945
2946                         best_partition_bits = 0xffffffff;
2947                         for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
2948 #endif
2949 #ifdef VARIABLE_RICE_BITS
2950 #ifdef FLAC__SYMMETRIC_RICE
2951                                 partition_bits = (2+rice_parameter) * partition_samples;
2952 #else
2953                                 const unsigned rice_parameter_estimate = rice_parameter-1;
2954                                 partition_bits = (1+rice_parameter) * partition_samples;
2955 #endif
2956 #else
2957                                 partition_bits = 0;
2958 #endif
2959                                 partition_bits += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
2960                                 save_residual_sample = residual_sample;
2961                                 for(partition_sample = 0; partition_sample < partition_samples; residual_sample++, partition_sample++) {
2962 #ifdef VARIABLE_RICE_BITS
2963 #ifdef FLAC__SYMMETRIC_RICE
2964                                         partition_bits += VARIABLE_RICE_BITS(abs_residual[residual_sample], rice_parameter);
2965 #else
2966                                         partition_bits += VARIABLE_RICE_BITS(abs_residual[residual_sample], rice_parameter_estimate);
2967 #endif
2968 #else
2969                                         partition_bits += FLAC__bitbuffer_rice_bits(residual[residual_sample], rice_parameter); /* NOTE: we will need to pass in residual[] instead of abs_residual[] */
2970 #endif
2971                                 }
2972 #ifndef NO_RICE_SEARCH
2973                                 if(rice_parameter != max_rice_parameter)
2974                                         residual_sample = save_residual_sample;
2975                                 if(partition_bits < best_partition_bits) {
2976                                         best_rice_parameter = rice_parameter;
2977                                         best_partition_bits = partition_bits;
2978                                 }
2979                         }
2980 #endif
2981                         if(search_for_escapes) {
2982                                 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;
2983                                 if(flat_bits <= best_partition_bits) {
2984                                         raw_bits[partition] = raw_bits_per_partition[partition];
2985                                         best_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
2986                                         best_partition_bits = flat_bits;
2987                                 }
2988                         }
2989                         parameters[partition] = best_rice_parameter;
2990                         bits_ += best_partition_bits;
2991                 }
2992         }
2993
2994         *bits = bits_;
2995         return true;
2996 }
2997
2998 unsigned get_wasted_bits_(FLAC__int32 signal[], unsigned samples)
2999 {
3000         unsigned i, shift;
3001         FLAC__int32 x = 0;
3002
3003         for(i = 0; i < samples && !(x&1); i++)
3004                 x |= signal[i];
3005
3006         if(x == 0) {
3007                 shift = 0;
3008         }
3009         else {
3010                 for(shift = 0; !(x&1); shift++)
3011                         x >>= 1;
3012         }
3013
3014         if(shift > 0) {
3015                 for(i = 0; i < samples; i++)
3016                          signal[i] >>= shift;
3017         }
3018
3019         return shift;
3020 }
3021
3022 void append_to_verify_fifo_(verify_input_fifo *fifo, const FLAC__int32 * const input[], unsigned input_offset, unsigned channels, unsigned wide_samples)
3023 {
3024         unsigned channel;
3025
3026         for(channel = 0; channel < channels; channel++)
3027                 memcpy(&fifo->data[channel][fifo->tail], &input[channel][input_offset], sizeof(FLAC__int32) * wide_samples);
3028
3029         fifo->tail += wide_samples;
3030
3031         FLAC__ASSERT(fifo->tail <= fifo->size);
3032 }
3033
3034 void append_to_verify_fifo_interleaved_(verify_input_fifo *fifo, const FLAC__int32 input[], unsigned input_offset, unsigned channels, unsigned wide_samples)
3035 {
3036         unsigned channel;
3037         unsigned sample, wide_sample;
3038         unsigned tail = fifo->tail;
3039
3040         sample = input_offset * channels;
3041         for(wide_sample = 0; wide_sample < wide_samples; wide_sample++) {
3042                 for(channel = 0; channel < channels; channel++)
3043                         fifo->data[channel][tail] = input[sample++];
3044                 tail++;
3045         }
3046         fifo->tail = tail;
3047
3048         FLAC__ASSERT(fifo->tail <= fifo->size);
3049 }
3050
3051 FLAC__StreamDecoderReadStatus verify_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data)
3052 {
3053         FLAC__StreamEncoder *encoder = (FLAC__StreamEncoder*)client_data;
3054         const unsigned encoded_bytes = encoder->private_->verify.output.bytes;
3055         (void)decoder;
3056
3057         if(encoder->private_->verify.needs_magic_hack) {
3058                 FLAC__ASSERT(*bytes >= FLAC__STREAM_SYNC_LENGTH);
3059                 *bytes = FLAC__STREAM_SYNC_LENGTH;
3060                 memcpy(buffer, FLAC__STREAM_SYNC_STRING, *bytes);
3061                 encoder->private_->verify.needs_magic_hack = false;
3062         }
3063         else {
3064                 if(encoded_bytes == 0) {
3065                         /*
3066                          * If we get here, a FIFO underflow has occurred,
3067                          * which means there is a bug somewhere.
3068                          */
3069                         FLAC__ASSERT(0);
3070                         return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
3071                 }
3072                 else if(encoded_bytes < *bytes)
3073                         *bytes = encoded_bytes;
3074                 memcpy(buffer, encoder->private_->verify.output.data, *bytes);
3075                 encoder->private_->verify.output.data += *bytes;
3076                 encoder->private_->verify.output.bytes -= *bytes;
3077         }
3078
3079         return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
3080 }
3081
3082 FLAC__StreamDecoderWriteStatus verify_write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
3083 {
3084         FLAC__StreamEncoder *encoder = (FLAC__StreamEncoder *)client_data;
3085         unsigned channel;
3086         const unsigned channels = FLAC__stream_decoder_get_channels(decoder);
3087         const unsigned blocksize = frame->header.blocksize;
3088         const unsigned bytes_per_block = sizeof(FLAC__int32) * blocksize;
3089
3090         for(channel = 0; channel < channels; channel++) {
3091                 if(0 != memcmp(buffer[channel], encoder->private_->verify.input_fifo.data[channel], bytes_per_block)) {
3092                         unsigned i, sample = 0;
3093                         FLAC__int32 expect = 0, got = 0;
3094
3095                         for(i = 0; i < blocksize; i++) {
3096                                 if(buffer[channel][i] != encoder->private_->verify.input_fifo.data[channel][i]) {
3097                                         sample = i;
3098                                         expect = (FLAC__int32)encoder->private_->verify.input_fifo.data[channel][i];
3099                                         got = (FLAC__int32)buffer[channel][i];
3100                                         break;
3101                                 }
3102                         }
3103                         FLAC__ASSERT(i < blocksize);
3104                         FLAC__ASSERT(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
3105                         encoder->private_->verify.error_stats.absolute_sample = frame->header.number.sample_number + sample;
3106                         encoder->private_->verify.error_stats.frame_number = (unsigned)(frame->header.number.sample_number / blocksize);
3107                         encoder->private_->verify.error_stats.channel = channel;
3108                         encoder->private_->verify.error_stats.sample = sample;
3109                         encoder->private_->verify.error_stats.expected = expect;
3110                         encoder->private_->verify.error_stats.got = got;
3111                         encoder->protected_->state = FLAC__STREAM_ENCODER_VERIFY_MISMATCH_IN_AUDIO_DATA;
3112                         return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
3113                 }
3114         }
3115         /* dequeue the frame from the fifo */
3116         for(channel = 0; channel < channels; channel++) {
3117                 memmove(&encoder->private_->verify.input_fifo.data[channel][0], &encoder->private_->verify.input_fifo.data[channel][blocksize], encoder->private_->verify.input_fifo.tail - blocksize);
3118         }
3119         encoder->private_->verify.input_fifo.tail -= blocksize;
3120         return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
3121 }
3122
3123 void verify_metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
3124 {
3125         (void)decoder, (void)metadata, (void)client_data;
3126 }
3127
3128 void verify_error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
3129 {
3130         FLAC__StreamEncoder *encoder = (FLAC__StreamEncoder*)client_data;
3131         (void)decoder, (void)status;
3132         encoder->protected_->state = FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR;
3133 }