src/libFLAC/stream_decoder.c

   1 /* libFLAC - Free Lossless Audio Codec library
   2  * Copyright (C) 2000,2001  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 <stdio.h>
  21 #include <stdlib.h> /* for malloc() */
  22 #include <string.h> /* for memset/memcpy() */
  23 #include "FLAC/assert.h"
  24 #include "protected/stream_decoder.h"
  25 #include "private/bitbuffer.h"
  26 #include "private/cpu.h"
  27 #include "private/crc.h"
  28 #include "private/fixed.h"
  29 #include "private/lpc.h"
  30
  31 /***********************************************************************
  32  *
  33  * Private static data
  34  *
  35  ***********************************************************************/
  36
  37 static FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' };
  38
  39 /***********************************************************************
  40  *
  41  * Private class method prototypes
  42  *
  43  ***********************************************************************/
  44
  45 static FLAC__bool stream_decoder_allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels);
  46 static FLAC__bool stream_decoder_find_metadata_(FLAC__StreamDecoder *decoder);
  47 static FLAC__bool stream_decoder_read_metadata_(FLAC__StreamDecoder *decoder);
  48 static FLAC__bool stream_decoder_skip_id3v2_tag_(FLAC__StreamDecoder *decoder);
  49 static FLAC__bool stream_decoder_frame_sync_(FLAC__StreamDecoder *decoder);
  50 static FLAC__bool stream_decoder_read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame);
  51 static FLAC__bool stream_decoder_read_frame_header_(FLAC__StreamDecoder *decoder);
  52 static FLAC__bool stream_decoder_read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  53 static FLAC__bool stream_decoder_read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  54 static FLAC__bool stream_decoder_read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order);
  55 static FLAC__bool stream_decoder_read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order);
  56 static FLAC__bool stream_decoder_read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  57 static FLAC__bool stream_decoder_read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, FLAC__EntropyCodingMethod_PartitionedRice *partitioned_rice, FLAC__int32 *residual);
  58 static FLAC__bool stream_decoder_read_zero_padding_(FLAC__StreamDecoder *decoder);
  59 static FLAC__bool read_callback_(FLAC__byte buffer[], unsigned *bytes, void *client_data);
  60
  61 /***********************************************************************
  62  *
  63  * Private class data
  64  *
  65  ***********************************************************************/
  66
  67 typedef struct FLAC__StreamDecoderPrivate {
  68         FLAC__StreamDecoderReadStatus (*read_callback)(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data);
  69         FLAC__StreamDecoderWriteStatus (*write_callback)(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data);
  70         void (*metadata_callback)(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data);
  71         void (*error_callback)(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
  72         void (*local_lpc_restore_signal)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
  73         void (*local_lpc_restore_signal_16bit)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
  74         void *client_data;
  75         FLAC__BitBuffer input;
  76         FLAC__int32 *output[FLAC__MAX_CHANNELS];
  77         FLAC__int32 *residual[FLAC__MAX_CHANNELS];
  78         unsigned output_capacity, output_channels;
  79         FLAC__uint32 last_frame_number;
  80         FLAC__uint64 samples_decoded;
  81         FLAC__bool has_stream_info, has_seek_table;
  82         FLAC__StreamMetaData stream_info;
  83         FLAC__StreamMetaData seek_table;
  84         FLAC__Frame frame;
  85         FLAC__bool cached; /* true if there is a byte in lookahead */
  86         FLAC__CPUInfo cpuinfo;
  87         FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */
  88         FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */
  89 } FLAC__StreamDecoderPrivate;
  90
  91 /***********************************************************************
  92  *
  93  * Public static class data
  94  *
  95  ***********************************************************************/
  96
  97 const char *FLAC__StreamDecoderStateString[] = {
  98         "FLAC__STREAM_DECODER_SEARCH_FOR_METADATA",
  99         "FLAC__STREAM_DECODER_READ_METADATA",
 100         "FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC",
 101         "FLAC__STREAM_DECODER_READ_FRAME",
 102         "FLAC__STREAM_DECODER_END_OF_STREAM",
 103         "FLAC__STREAM_DECODER_ABORTED",
 104         "FLAC__STREAM_DECODER_UNPARSEABLE_STREAM",
 105         "FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR",
 106         "FLAC__STREAM_DECODER_ALREADY_INITIALIZED",
 107         "FLAC__STREAM_DECODER_INVALID_CALLBACK",
 108         "FLAC__STREAM_DECODER_UNINITIALIZED"
 109 };
 110
 111 const char *FLAC__StreamDecoderReadStatusString[] = {
 112         "FLAC__STREAM_DECODER_READ_CONTINUE",
 113         "FLAC__STREAM_DECODER_READ_END_OF_STREAM",
 114         "FLAC__STREAM_DECODER_READ_ABORT"
 115 };
 116
 117 const char *FLAC__StreamDecoderWriteStatusString[] = {
 118         "FLAC__STREAM_DECODER_WRITE_CONTINUE",
 119         "FLAC__STREAM_DECODER_WRITE_ABORT"
 120 };
 121
 122 const char *FLAC__StreamDecoderErrorStatusString[] = {
 123         "FLAC__STREAM_DECODER_ERROR_LOST_SYNC",
 124         "FLAC__STREAM_DECODER_ERROR_BAD_HEADER",
 125         "FLAC__STREAM_DECODER_ERROR_FRAME_CRC_MISMATCH"
 126 };
 127
 128 /***********************************************************************
 129  *
 130  * Class constructor/destructor
 131  *
 132  ***********************************************************************/
 133 FLAC__StreamDecoder *FLAC__stream_decoder_new()
 134 {
 135         FLAC__StreamDecoder *decoder;
 136
 137         FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
 138
 139         decoder = (FLAC__StreamDecoder*)malloc(sizeof(FLAC__StreamDecoder));
 140         if(decoder == 0) {
 141                 return 0;
 142         }
 143         decoder->protected_ = (FLAC__StreamDecoderProtected*)malloc(sizeof(FLAC__StreamDecoderProtected));
 144         if(decoder->protected_ == 0) {
 145                 free(decoder);
 146                 return 0;
 147         }
 148         decoder->private_ = (FLAC__StreamDecoderPrivate*)malloc(sizeof(FLAC__StreamDecoderPrivate));
 149         if(decoder->private_ == 0) {
 150                 free(decoder->protected_);
 151                 free(decoder);
 152                 return 0;
 153         }
 154
 155         decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
 156
 157         decoder->private_->read_callback = 0;
 158         decoder->private_->write_callback = 0;
 159         decoder->private_->metadata_callback = 0;
 160         decoder->private_->error_callback = 0;
 161         decoder->private_->client_data = 0;
 162
 163         return decoder;
 164 }
 165
 166 void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder)
 167 {
 168         FLAC__ASSERT(decoder != 0);
 169         FLAC__ASSERT(decoder->protected_ != 0);
 170         FLAC__ASSERT(decoder->private_ != 0);
 171
 172         free(decoder->private_);
 173         free(decoder->protected_);
 174         free(decoder);
 175 }
 176
 177 /***********************************************************************
 178  *
 179  * Public class methods
 180  *
 181  ***********************************************************************/
 182
 183 FLAC__StreamDecoderState FLAC__stream_decoder_init(FLAC__StreamDecoder *decoder)
 184 {
 185         unsigned i;
 186
 187         FLAC__ASSERT(decoder != 0);
 188
 189         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 190                 return decoder->protected_->state = FLAC__STREAM_DECODER_ALREADY_INITIALIZED;
 191
 192         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
 193
 194         if(0 == decoder->private_->read_callback || 0 == decoder->private_->write_callback || 0 == decoder->private_->metadata_callback || 0 == decoder->private_->error_callback)
 195                 return decoder->protected_->state = FLAC__STREAM_DECODER_INVALID_CALLBACK;
 196
 197         FLAC__bitbuffer_init(&decoder->private_->input);
 198
 199         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 200                 decoder->private_->output[i] = 0;
 201                 decoder->private_->residual[i] = 0;
 202         }
 203
 204         decoder->private_->output_capacity = 0;
 205         decoder->private_->output_channels = 0;
 206         decoder->private_->last_frame_number = 0;
 207         decoder->private_->samples_decoded = 0;
 208         decoder->private_->has_stream_info = false;
 209         decoder->private_->has_seek_table = false;
 210         decoder->private_->cached = false;
 211
 212         /*
 213          * get the CPU info and set the function pointers
 214          */
 215         FLAC__cpu_info(&decoder->private_->cpuinfo);
 216         /* first default to the non-asm routines */
 217         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal;
 218         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal;
 219         /* now override with asm where appropriate */
 220 #ifndef FLAC__NO_ASM
 221         if(decoder->private_->cpuinfo.use_asm) {
 222 #ifdef FLAC__CPU_IA32
 223                 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
 224 #ifdef FLAC__HAS_NASM
 225                 if(decoder->private_->cpuinfo.data.ia32.mmx) {
 226                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
 227                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32_mmx;
 228                 }
 229                 else {
 230                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
 231                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32;
 232                 }
 233 #endif
 234 #endif
 235         }
 236 #endif
 237
 238         return decoder->protected_->state;
 239 }
 240
 241 void FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder)
 242 {
 243         unsigned i;
 244         FLAC__ASSERT(decoder != 0);
 245         if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
 246                 return;
 247         if(decoder->private_->has_seek_table) {
 248                 free(decoder->private_->seek_table.data.seek_table.points);
 249                 decoder->private_->seek_table.data.seek_table.points = 0;
 250         }
 251         FLAC__bitbuffer_free(&decoder->private_->input);
 252         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 253                 /* WATCHOUT: FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the output arrays have a buffer of up to 3 zeroes in front (at negative indices) for alignment purposes; we use 4 to keep the data well-aligned. */
 254                 if(decoder->private_->output[i] != 0) {
 255                         free(decoder->private_->output[i]-4);
 256                         decoder->private_->output[i] = 0;
 257                 }
 258                 if(decoder->private_->residual[i] != 0) {
 259                         free(decoder->private_->residual[i]);
 260                         decoder->private_->residual[i] = 0;
 261                 }
 262         }
 263         decoder->private_->output_capacity = 0;
 264         decoder->private_->output_channels = 0;
 265         decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
 266 }
 267
 268 FLAC__bool FLAC__stream_decoder_set_read_callback(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderReadStatus (*value)(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data))
 269 {
 270         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 271                 return false;
 272         decoder->private_->read_callback = value;
 273         return true;
 274 }
 275
 276 FLAC__bool FLAC__stream_decoder_set_write_callback(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderWriteStatus (*value)(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data))
 277 {
 278         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 279                 return false;
 280         decoder->private_->write_callback = value;
 281         return true;
 282 }
 283
 284 FLAC__bool FLAC__stream_decoder_set_metadata_callback(const FLAC__StreamDecoder *decoder, void (*value)(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data))
 285 {
 286         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 287                 return false;
 288         decoder->private_->metadata_callback = value;
 289         return true;
 290 }
 291
 292 FLAC__bool FLAC__stream_decoder_set_error_callback(const FLAC__StreamDecoder *decoder, void (*value)(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data))
 293 {
 294         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 295                 return false;
 296         decoder->private_->error_callback = value;
 297         return true;
 298 }
 299
 300 FLAC__bool FLAC__stream_decoder_set_client_data(const FLAC__StreamDecoder *decoder, void *value)
 301 {
 302         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 303                 return false;
 304         decoder->private_->client_data = value;
 305         return true;
 306 }
 307
 308 FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder)
 309 {
 310         return decoder->protected_->state;
 311 }
 312
 313 unsigned FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder)
 314 {
 315         return decoder->protected_->channels;
 316 }
 317
 318 FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder)
 319 {
 320         return decoder->protected_->channel_assignment;
 321 }
 322
 323 unsigned FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder)
 324 {
 325         return decoder->protected_->bits_per_sample;
 326 }
 327
 328 unsigned FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder)
 329 {
 330         return decoder->protected_->sample_rate;
 331 }
 332
 333 unsigned FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder)
 334 {
 335         return decoder->protected_->blocksize;
 336 }
 337
 338 FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder)
 339 {
 340         FLAC__ASSERT(decoder != 0);
 341
 342         if(!FLAC__bitbuffer_clear(&decoder->private_->input)) {
 343                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 344                 return false;
 345         }
 346
 347         return true;
 348 }
 349
 350 FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder)
 351 {
 352         FLAC__ASSERT(decoder != 0);
 353
 354         if(!FLAC__stream_decoder_flush(decoder)) {
 355                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 356                 return false;
 357         }
 358         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
 359
 360         decoder->private_->samples_decoded = 0;
 361
 362         return true;
 363 }
 364
 365 FLAC__bool FLAC__stream_decoder_process_whole_stream(FLAC__StreamDecoder *decoder)
 366 {
 367         FLAC__bool dummy;
 368         FLAC__ASSERT(decoder != 0);
 369
 370         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 371                 return true;
 372
 373         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA);
 374
 375         if(!FLAC__stream_decoder_reset(decoder)) {
 376                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 377                 return false;
 378         }
 379
 380         while(1) {
 381                 switch(decoder->protected_->state) {
 382                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
 383                                 if(!stream_decoder_find_metadata_(decoder))
 384                                         return false; /* above function sets the status for us */
 385                                 break;
 386                         case FLAC__STREAM_DECODER_READ_METADATA:
 387                                 if(!stream_decoder_read_metadata_(decoder))
 388                                         return false; /* above function sets the status for us */
 389                                 break;
 390                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 391                                 if(!stream_decoder_frame_sync_(decoder))
 392                                         return true; /* above function sets the status for us */
 393                                 break;
 394                         case FLAC__STREAM_DECODER_READ_FRAME:
 395                                 if(!stream_decoder_read_frame_(decoder, &dummy))
 396                                         return false; /* above function sets the status for us */
 397                                 break;
 398                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 399                                 return true;
 400                         default:
 401                                 FLAC__ASSERT(0);
 402                 }
 403         }
 404 }
 405
 406 FLAC__bool FLAC__stream_decoder_process_metadata(FLAC__StreamDecoder *decoder)
 407 {
 408         FLAC__ASSERT(decoder != 0);
 409
 410         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 411                 return true;
 412
 413         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA);
 414
 415         if(!FLAC__stream_decoder_reset(decoder)) {
 416                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 417                 return false;
 418         }
 419
 420         while(1) {
 421                 switch(decoder->protected_->state) {
 422                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
 423                                 if(!stream_decoder_find_metadata_(decoder))
 424                                         return false; /* above function sets the status for us */
 425                                 break;
 426                         case FLAC__STREAM_DECODER_READ_METADATA:
 427                                 if(!stream_decoder_read_metadata_(decoder))
 428                                         return false; /* above function sets the status for us */
 429                                 break;
 430                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 431                                 return true;
 432                                 break;
 433                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 434                                 return true;
 435                         default:
 436                                 FLAC__ASSERT(0);
 437                 }
 438         }
 439 }
 440
 441 FLAC__bool FLAC__stream_decoder_process_one_frame(FLAC__StreamDecoder *decoder)
 442 {
 443         FLAC__bool got_a_frame;
 444         FLAC__ASSERT(decoder != 0);
 445
 446         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 447                 return true;
 448
 449         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC);
 450
 451         while(1) {
 452                 switch(decoder->protected_->state) {
 453                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 454                                 if(!stream_decoder_frame_sync_(decoder))
 455                                         return true; /* above function sets the status for us */
 456                                 break;
 457                         case FLAC__STREAM_DECODER_READ_FRAME:
 458                                 if(!stream_decoder_read_frame_(decoder, &got_a_frame))
 459                                         return false; /* above function sets the status for us */
 460                                 if(got_a_frame)
 461                                         return true; /* above function sets the status for us */
 462                                 break;
 463                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 464                                 return true;
 465                         default:
 466                                 FLAC__ASSERT(0);
 467                 }
 468         }
 469 }
 470
 471 FLAC__bool FLAC__stream_decoder_process_remaining_frames(FLAC__StreamDecoder *decoder)
 472 {
 473         FLAC__bool dummy;
 474         FLAC__ASSERT(decoder != 0);
 475
 476         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 477                 return true;
 478
 479         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC);
 480
 481         while(1) {
 482                 switch(decoder->protected_->state) {
 483                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 484                                 if(!stream_decoder_frame_sync_(decoder))
 485                                         return true; /* above function sets the status for us */
 486                                 break;
 487                         case FLAC__STREAM_DECODER_READ_FRAME:
 488                                 if(!stream_decoder_read_frame_(decoder, &dummy))
 489                                         return false; /* above function sets the status for us */
 490                                 break;
 491                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 492                                 return true;
 493                         default:
 494                                 FLAC__ASSERT(0);
 495                 }
 496         }
 497 }
 498
 499 /***********************************************************************
 500  *
 501  * Protected class methods
 502  *
 503  ***********************************************************************/
 504
 505 unsigned FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder)
 506 {
 507         FLAC__ASSERT(decoder != 0);
 508         return decoder->private_->input.bytes - decoder->private_->input.consumed_bytes;
 509 }
 510
 511 /***********************************************************************
 512  *
 513  * Private class methods
 514  *
 515  ***********************************************************************/
 516
 517 FLAC__bool stream_decoder_allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels)
 518 {
 519         unsigned i;
 520         FLAC__int32 *tmp;
 521
 522         if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels)
 523                 return true;
 524
 525         /* @@@ should change to use realloc() */
 526
 527         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 528                 if(decoder->private_->output[i] != 0) {
 529                         free(decoder->private_->output[i]);
 530                         decoder->private_->output[i] = 0;
 531                 }
 532                 if(decoder->private_->residual[i] != 0) {
 533                         free(decoder->private_->residual[i]);
 534                         decoder->private_->residual[i] = 0;
 535                 }
 536         }
 537
 538         for(i = 0; i < channels; i++) {
 539                 /* WATCHOUT: FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the output arrays have a buffer of up to 3 zeroes in front (at negative indices) for alignment purposes; we use 4 to keep the data well-aligned. */
 540                 tmp = (FLAC__int32*)malloc(sizeof(FLAC__int32)*(size+4));
 541                 if(tmp == 0) {
 542                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 543                         return false;
 544                 }
 545                 memset(tmp, 0, sizeof(FLAC__int32)*4);
 546                 decoder->private_->output[i] = tmp + 4;
 547
 548                 tmp = (FLAC__int32*)malloc(sizeof(FLAC__int32)*size);
 549                 if(tmp == 0) {
 550                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 551                         return false;
 552                 }
 553                 decoder->private_->residual[i] = tmp;
 554         }
 555
 556         decoder->private_->output_capacity = size;
 557         decoder->private_->output_channels = channels;
 558
 559         return true;
 560 }
 561
 562 FLAC__bool stream_decoder_find_metadata_(FLAC__StreamDecoder *decoder)
 563 {
 564         FLAC__uint32 x;
 565         unsigned i, id;
 566         FLAC__bool first = true;
 567
 568         FLAC__ASSERT(decoder->private_->input.consumed_bits == 0); /* make sure we're byte aligned */
 569
 570         for(i = id = 0; i < 4; ) {
 571                 if(decoder->private_->cached) {
 572                         x = (FLAC__uint32)decoder->private_->lookahead;
 573                         decoder->private_->cached = false;
 574                 }
 575                 else {
 576                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
 577                                 return false; /* the read_callback_ sets the state for us */
 578                 }
 579                 if(x == FLAC__STREAM_SYNC_STRING[i]) {
 580                         first = true;
 581                         i++;
 582                         id = 0;
 583                         continue;
 584                 }
 585                 if(x == ID3V2_TAG_[id]) {
 586                         id++;
 587                         i = 0;
 588                         if(id == 3) {
 589                                 if(!stream_decoder_skip_id3v2_tag_(decoder))
 590                                         return false; /* the read_callback_ sets the state for us */
 591                         }
 592                         continue;
 593                 }
 594                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 595                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
 596                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
 597                                 return false; /* the read_callback_ sets the state for us */
 598
 599                         /* we have to check if we just read two 0xff's in a row; the second may actually be the beginning of the sync code */
 600                         /* else we have to check if the second byte is the end of a sync code */
 601                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 602                                 decoder->private_->lookahead = (FLAC__byte)x;
 603                                 decoder->private_->cached = true;
 604                         }
 605                         else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
 606                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
 607                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
 608                                 return true;
 609                         }
 610                 }
 611                 i = 0;
 612                 if(first) {
 613                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_LOST_SYNC, decoder->private_->client_data);
 614                         first = false;
 615                 }
 616         }
 617
 618         decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA;
 619         return true;
 620 }
 621
 622 FLAC__bool stream_decoder_read_metadata_(FLAC__StreamDecoder *decoder)
 623 {
 624         FLAC__uint32 i, x, last_block, type, length;
 625         FLAC__uint64 xx;
 626
 627         FLAC__ASSERT(decoder->private_->input.consumed_bits == 0); /* make sure we're byte aligned */
 628
 629         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &last_block, FLAC__STREAM_METADATA_IS_LAST_LEN, read_callback_, decoder))
 630                 return false; /* the read_callback_ sets the state for us */
 631         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN, read_callback_, decoder))
 632                 return false; /* the read_callback_ sets the state for us */
 633         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN, read_callback_, decoder))
 634                 return false; /* the read_callback_ sets the state for us */
 635         if(type == FLAC__METADATA_TYPE_STREAMINFO) {
 636                 unsigned used_bits = 0;
 637                 decoder->private_->stream_info.type = type;
 638                 decoder->private_->stream_info.is_last = last_block;
 639                 decoder->private_->stream_info.length = length;
 640
 641                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN, read_callback_, decoder))
 642                         return false; /* the read_callback_ sets the state for us */
 643                 decoder->private_->stream_info.data.stream_info.min_blocksize = x;
 644                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN;
 645
 646                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN, read_callback_, decoder))
 647                         return false; /* the read_callback_ sets the state for us */
 648                 decoder->private_->stream_info.data.stream_info.max_blocksize = x;
 649                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN;
 650
 651                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN, read_callback_, decoder))
 652                         return false; /* the read_callback_ sets the state for us */
 653                 decoder->private_->stream_info.data.stream_info.min_framesize = x;
 654                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN;
 655
 656                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN, read_callback_, decoder))
 657                         return false; /* the read_callback_ sets the state for us */
 658                 decoder->private_->stream_info.data.stream_info.max_framesize = x;
 659                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN;
 660
 661                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN, read_callback_, decoder))
 662                         return false; /* the read_callback_ sets the state for us */
 663                 decoder->private_->stream_info.data.stream_info.sample_rate = x;
 664                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN;
 665
 666                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN, read_callback_, decoder))
 667                         return false; /* the read_callback_ sets the state for us */
 668                 decoder->private_->stream_info.data.stream_info.channels = x+1;
 669                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN;
 670
 671                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN, read_callback_, decoder))
 672                         return false; /* the read_callback_ sets the state for us */
 673                 decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1;
 674                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN;
 675
 676                 if(!FLAC__bitbuffer_read_raw_uint64(&decoder->private_->input, &decoder->private_->stream_info.data.stream_info.total_samples, FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN, read_callback_, decoder))
 677                         return false; /* the read_callback_ sets the state for us */
 678                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN;
 679
 680                 for(i = 0; i < 16; i++) {
 681                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
 682                                 return false; /* the read_callback_ sets the state for us */
 683                         decoder->private_->stream_info.data.stream_info.md5sum[i] = (FLAC__byte)x;
 684                 }
 685                 used_bits += i*8;
 686
 687                 /* skip the rest of the block */
 688                 FLAC__ASSERT(used_bits % 8 == 0);
 689                 length -= (used_bits / 8);
 690                 for(i = 0; i < length; i++) {
 691                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
 692                                 return false; /* the read_callback_ sets the state for us */
 693                 }
 694
 695                 decoder->private_->has_stream_info = true;
 696                 decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data);
 697         }
 698         else if(type == FLAC__METADATA_TYPE_SEEKTABLE) {
 699                 unsigned real_points;
 700
 701                 decoder->private_->seek_table.type = type;
 702                 decoder->private_->seek_table.is_last = last_block;
 703                 decoder->private_->seek_table.length = length;
 704
 705                 decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LEN;
 706
 707                 if(0 == (decoder->private_->seek_table.data.seek_table.points = (FLAC__StreamMetaData_SeekPoint*)malloc(decoder->private_->seek_table.data.seek_table.num_points * sizeof(FLAC__StreamMetaData_SeekPoint)))) {
 708                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 709                         return false;
 710                 }
 711                 for(i = real_points = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) {
 712                         if(!FLAC__bitbuffer_read_raw_uint64(&decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN, read_callback_, decoder))
 713                                 return false; /* the read_callback_ sets the state for us */
 714                         decoder->private_->seek_table.data.seek_table.points[real_points].sample_number = xx;
 715
 716                         if(!FLAC__bitbuffer_read_raw_uint64(&decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN, read_callback_, decoder))
 717                                 return false; /* the read_callback_ sets the state for us */
 718                         decoder->private_->seek_table.data.seek_table.points[real_points].stream_offset = xx;
 719
 720                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN, read_callback_, decoder))
 721                                 return false; /* the read_callback_ sets the state for us */
 722                         decoder->private_->seek_table.data.seek_table.points[real_points].frame_samples = x;
 723
 724                         if(decoder->private_->seek_table.data.seek_table.points[real_points].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER)
 725                                 real_points++;
 726                 }
 727                 decoder->private_->seek_table.data.seek_table.num_points = real_points;
 728
 729                 decoder->private_->has_seek_table = true;
 730                 decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data);
 731         }
 732         else {
 733                 /* skip other metadata blocks */
 734                 for(i = 0; i < length; i++) {
 735                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
 736                                 return false; /* the read_callback_ sets the state for us */
 737                 }
 738         }
 739
 740         if(last_block)
 741                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 742
 743         return true;
 744 }
 745
 746 FLAC__bool stream_decoder_skip_id3v2_tag_(FLAC__StreamDecoder *decoder)
 747 {
 748         FLAC__uint32 x;
 749         unsigned i, skip;
 750
 751         /* skip the version and flags bytes */
 752         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 24, read_callback_, decoder))
 753                 return false; /* the read_callback_ sets the state for us */
 754         /* get the size (in bytes) to skip */
 755         skip = 0;
 756         for(i = 0; i < 4; i++) {
 757                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
 758                         return false; /* the read_callback_ sets the state for us */
 759                 skip <<= 7;
 760                 skip |= (x & 0x7f);
 761         }
 762         /* skip the rest of the tag */
 763         for(i = 0; i < skip; i++) {
 764                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
 765                         return false; /* the read_callback_ sets the state for us */
 766         }
 767         return true;
 768 }
 769
 770 FLAC__bool stream_decoder_frame_sync_(FLAC__StreamDecoder *decoder)
 771 {
 772         FLAC__uint32 x;
 773         FLAC__bool first = true;
 774
 775         /* If we know the total number of samples in the stream, stop if we've read that many. */
 776         /* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */
 777         if(decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.total_samples) {
 778                 if(decoder->private_->samples_decoded >= decoder->private_->stream_info.data.stream_info.total_samples) {
 779                         decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
 780                         return true;
 781                 }
 782         }
 783
 784         /* make sure we're byte aligned */
 785         if(decoder->private_->input.consumed_bits != 0) {
 786                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8-decoder->private_->input.consumed_bits, read_callback_, decoder))
 787                         return false; /* the read_callback_ sets the state for us */
 788         }
 789
 790         while(1) {
 791                 if(decoder->private_->cached) {
 792                         x = (FLAC__uint32)decoder->private_->lookahead;
 793                         decoder->private_->cached = false;
 794                 }
 795                 else {
 796                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
 797                                 return false; /* the read_callback_ sets the state for us */
 798                 }
 799                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 800                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
 801                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
 802                                 return false; /* the read_callback_ sets the state for us */
 803
 804                         /* we have to check if we just read two 0xff's in a row; the second may actually be the beginning of the sync code */
 805                         /* else we have to check if the second byte is the end of a sync code */
 806                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 807                                 decoder->private_->lookahead = (FLAC__byte)x;
 808                                 decoder->private_->cached = true;
 809                         }
 810                         else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
 811                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
 812                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
 813                                 return true;
 814                         }
 815                 }
 816                 if(first) {
 817                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_LOST_SYNC, decoder->private_->client_data);
 818                         first = 0;
 819                 }
 820         }
 821
 822         return true;
 823 }
 824
 825 FLAC__bool stream_decoder_read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame)
 826 {
 827         unsigned channel;
 828         unsigned i;
 829         FLAC__int32 mid, side, left, right;
 830         FLAC__uint16 frame_crc; /* the one we calculate from the input stream */
 831         FLAC__uint32 x;
 832
 833         *got_a_frame = false;
 834
 835         /* init the CRC */
 836         frame_crc = 0;
 837         FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc);
 838         FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc);
 839         FLAC__bitbuffer_init_read_crc16(&decoder->private_->input, frame_crc);
 840
 841         if(!stream_decoder_read_frame_header_(decoder))
 842                 return false;
 843         if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC)
 844                 return true;
 845         if(!stream_decoder_allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels))
 846                 return false;
 847         for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
 848                 /*
 849                  * first figure the correct bits-per-sample of the subframe
 850                  */
 851                 unsigned bps = decoder->private_->frame.header.bits_per_sample;
 852                 switch(decoder->private_->frame.header.channel_assignment) {
 853                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
 854                                 /* no adjustment needed */
 855                                 break;
 856                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
 857                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
 858                                 if(channel == 1)
 859                                         bps++;
 860                                 break;
 861                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
 862                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
 863                                 if(channel == 0)
 864                                         bps++;
 865                                 break;
 866                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
 867                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
 868                                 if(channel == 1)
 869                                         bps++;
 870                                 break;
 871                         default:
 872                                 FLAC__ASSERT(0);
 873                 }
 874                 /*
 875                  * now read it
 876                  */
 877                 if(!stream_decoder_read_subframe_(decoder, channel, bps))
 878                         return false;
 879                 if(decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME) {
 880                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 881                         return true;
 882                 }
 883         }
 884         if(!stream_decoder_read_zero_padding_(decoder))
 885                 return false;
 886
 887         /*
 888          * Read the frame CRC-16 from the footer and check
 889          */
 890         frame_crc = decoder->private_->input.read_crc16;
 891         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN, read_callback_, decoder))
 892                 return false; /* the read_callback_ sets the state for us */
 893         if(frame_crc == (FLAC__uint16)x) {
 894                 /* Undo any special channel coding */
 895                 switch(decoder->private_->frame.header.channel_assignment) {
 896                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
 897                                 /* do nothing */
 898                                 break;
 899                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
 900                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
 901                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
 902                                         decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i];
 903                                 break;
 904                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
 905                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
 906                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
 907                                         decoder->private_->output[0][i] += decoder->private_->output[1][i];
 908                                 break;
 909                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
 910                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
 911                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
 912                                         mid = decoder->private_->output[0][i];
 913                                         side = decoder->private_->output[1][i];
 914                                         mid <<= 1;
 915                                         if(side & 1) /* i.e. if 'side' is odd... */
 916                                                 mid++;
 917                                         left = mid + side;
 918                                         right = mid - side;
 919                                         decoder->private_->output[0][i] = left >> 1;
 920                                         decoder->private_->output[1][i] = right >> 1;
 921                                 }
 922                                 break;
 923                         default:
 924                                 FLAC__ASSERT(0);
 925                                 break;
 926                 }
 927         }
 928         else {
 929                 /* Bad frame, emit error and zero the output signal */
 930                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_FRAME_CRC_MISMATCH, decoder->private_->client_data);
 931                 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
 932                         memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
 933                 }
 934         }
 935
 936         *got_a_frame = true;
 937
 938         /* put the latest values into the public section of the decoder instance */
 939         decoder->protected_->channels = decoder->private_->frame.header.channels;
 940         decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment;
 941         decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample;
 942         decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate;
 943         decoder->protected_->blocksize = decoder->private_->frame.header.blocksize;
 944
 945         FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
 946         decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize;
 947
 948         /* write it */
 949         /* NOTE: some versions of GCC can't figure out const-ness right and will give you an 'incompatible pointer type' warning on arg 3 here: */
 950         if(decoder->private_->write_callback(decoder, &decoder->private_->frame, decoder->private_->output, decoder->private_->client_data) != FLAC__STREAM_DECODER_WRITE_CONTINUE)
 951                 return false;
 952
 953         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 954         return true;
 955 }
 956
 957 FLAC__bool stream_decoder_read_frame_header_(FLAC__StreamDecoder *decoder)
 958 {
 959         FLAC__uint32 x;
 960         FLAC__uint64 xx;
 961         unsigned i, blocksize_hint = 0, sample_rate_hint = 0;
 962         FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */
 963         unsigned raw_header_len;
 964         FLAC__bool is_unparseable = false;
 965         const FLAC__bool is_known_variable_blocksize_stream = (decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.min_blocksize != decoder->private_->stream_info.data.stream_info.max_blocksize);
 966         const FLAC__bool is_known_fixed_blocksize_stream = (decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.min_blocksize == decoder->private_->stream_info.data.stream_info.max_blocksize);
 967
 968         FLAC__ASSERT(decoder->private_->input.consumed_bits == 0); /* make sure we're byte aligned */
 969
 970         /* init the raw header with the saved bits from synchronization */
 971         raw_header[0] = decoder->private_->header_warmup[0];
 972         raw_header[1] = decoder->private_->header_warmup[1];
 973         raw_header_len = 2;
 974
 975         /*
 976          * check to make sure that the reserved bits are 0
 977          */
 978         if(raw_header[1] & 0x03) { /* MAGIC NUMBER */
 979                 is_unparseable = true;
 980         }
 981
 982         /*
 983          * Note that along the way as we read the header, we look for a sync
 984          * code inside.  If we find one it would indicate that our original
 985          * sync was bad since there cannot be a sync code in a valid header.
 986          */
 987
 988         /*
 989          * read in the raw header as bytes so we can CRC it, and parse it on the way
 990          */
 991         for(i = 0; i < 2; i++) {
 992                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
 993                         return false; /* the read_callback_ sets the state for us */
 994                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 995                         /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */
 996                         decoder->private_->lookahead = (FLAC__byte)x;
 997                         decoder->private_->cached = true;
 998                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private_->client_data);
 999                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1000                         return true;
1001                 }
1002                 raw_header[raw_header_len++] = (FLAC__byte)x;
1003         }
1004
1005         switch(x = raw_header[2] >> 4) {
1006                 case 0:
1007                         if(is_known_fixed_blocksize_stream)
1008                                 decoder->private_->frame.header.blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize;
1009                         else
1010                                 is_unparseable = true;
1011                         break;
1012                 case 1:
1013                         decoder->private_->frame.header.blocksize = 192;
1014                         break;
1015                 case 2:
1016                 case 3:
1017                 case 4:
1018                 case 5:
1019                         decoder->private_->frame.header.blocksize = 576 << (x-2);
1020                         break;
1021                 case 6:
1022                 case 7:
1023                         blocksize_hint = x;
1024                         break;
1025                 case 8:
1026                 case 9:
1027                 case 10:
1028                 case 11:
1029                 case 12:
1030                 case 13:
1031                 case 14:
1032                 case 15:
1033                         decoder->private_->frame.header.blocksize = 256 << (x-8);
1034                         break;
1035                 default:
1036                         FLAC__ASSERT(0);
1037                         break;
1038         }
1039
1040         switch(x = raw_header[2] & 0x0f) {
1041                 case 0:
1042                         if(decoder->private_->has_stream_info)
1043                                 decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate;
1044                         else
1045                                 is_unparseable = true;
1046                         break;
1047                 case 1:
1048                 case 2:
1049                 case 3:
1050                         is_unparseable = true;
1051                         break;
1052                 case 4:
1053                         decoder->private_->frame.header.sample_rate = 8000;
1054                         break;
1055                 case 5:
1056                         decoder->private_->frame.header.sample_rate = 16000;
1057                         break;
1058                 case 6:
1059                         decoder->private_->frame.header.sample_rate = 22050;
1060                         break;
1061                 case 7:
1062                         decoder->private_->frame.header.sample_rate = 24000;
1063                         break;
1064                 case 8:
1065                         decoder->private_->frame.header.sample_rate = 32000;
1066                         break;
1067                 case 9:
1068                         decoder->private_->frame.header.sample_rate = 44100;
1069                         break;
1070                 case 10:
1071                         decoder->private_->frame.header.sample_rate = 48000;
1072                         break;
1073                 case 11:
1074                         decoder->private_->frame.header.sample_rate = 96000;
1075                         break;
1076                 case 12:
1077                 case 13:
1078                 case 14:
1079                         sample_rate_hint = x;
1080                         break;
1081                 case 15:
1082                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private_->client_data);
1083                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1084                         return true;
1085                 default:
1086                         FLAC__ASSERT(0);
1087         }
1088
1089         x = (unsigned)(raw_header[3] >> 4);
1090         if(x & 8) {
1091                 decoder->private_->frame.header.channels = 2;
1092                 switch(x & 7) {
1093                         case 0:
1094                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE;
1095                                 break;
1096                         case 1:
1097                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE;
1098                                 break;
1099                         case 2:
1100                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE;
1101                                 break;
1102                         default:
1103                                 is_unparseable = true;
1104                                 break;
1105                 }
1106         }
1107         else {
1108                 decoder->private_->frame.header.channels = (unsigned)x + 1;
1109                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT;
1110         }
1111
1112         switch(x = (unsigned)(raw_header[3] & 0x0e) >> 1) {
1113                 case 0:
1114                         if(decoder->private_->has_stream_info)
1115                                 decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample;
1116                         else
1117                                 is_unparseable = true;
1118                         break;
1119                 case 1:
1120                         decoder->private_->frame.header.bits_per_sample = 8;
1121                         break;
1122                 case 2:
1123                         decoder->private_->frame.header.bits_per_sample = 12;
1124                         break;
1125                 case 4:
1126                         decoder->private_->frame.header.bits_per_sample = 16;
1127                         break;
1128                 case 5:
1129                         decoder->private_->frame.header.bits_per_sample = 20;
1130                         break;
1131                 case 6:
1132                         decoder->private_->frame.header.bits_per_sample = 24;
1133                         break;
1134                 case 3:
1135                 case 7:
1136                         is_unparseable = true;
1137                         break;
1138                 default:
1139                         FLAC__ASSERT(0);
1140                         break;
1141         }
1142
1143         if(raw_header[3] & 0x01) { /* this should be a zero padding bit */
1144                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private_->client_data);
1145                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1146                 return true;
1147         }
1148
1149         if(blocksize_hint && is_known_variable_blocksize_stream) {
1150                 if(!FLAC__bitbuffer_read_utf8_uint64(&decoder->private_->input, &xx, read_callback_, decoder, raw_header, &raw_header_len))
1151                         return false; /* the read_callback_ sets the state for us */
1152                 if(xx == 0xffffffffffffffff) { /* i.e. non-UTF8 code... */
1153                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
1154                         decoder->private_->cached = true;
1155                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private_->client_data);
1156                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1157                         return true;
1158                 }
1159                 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
1160                 decoder->private_->frame.header.number.sample_number = xx;
1161         }
1162         else {
1163                 if(!FLAC__bitbuffer_read_utf8_uint32(&decoder->private_->input, &x, read_callback_, decoder, raw_header, &raw_header_len))
1164                         return false; /* the read_callback_ sets the state for us */
1165                 if(x == 0xffffffff) { /* i.e. non-UTF8 code... */
1166                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
1167                         decoder->private_->cached = true;
1168                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private_->client_data);
1169                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1170                         return true;
1171                 }
1172                 decoder->private_->last_frame_number = x;
1173                 if(decoder->private_->has_stream_info) {
1174                         decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
1175                         decoder->private_->frame.header.number.sample_number = (FLAC__int64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__int64)x;
1176                 }
1177                 else {
1178                         is_unparseable = true;
1179                 }
1180         }
1181
1182         if(blocksize_hint) {
1183                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
1184                         return false; /* the read_callback_ sets the state for us */
1185                 raw_header[raw_header_len++] = (FLAC__byte)x;
1186                 if(blocksize_hint == 7) {
1187                         FLAC__uint32 _x;
1188                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &_x, 8, read_callback_, decoder))
1189                                 return false; /* the read_callback_ sets the state for us */
1190                         raw_header[raw_header_len++] = (FLAC__byte)_x;
1191                         x = (x << 8) | _x;
1192                 }
1193                 decoder->private_->frame.header.blocksize = x+1;
1194         }
1195
1196         if(sample_rate_hint) {
1197                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
1198                         return false; /* the read_callback_ sets the state for us */
1199                 raw_header[raw_header_len++] = (FLAC__byte)x;
1200                 if(sample_rate_hint != 12) {
1201                         FLAC__uint32 _x;
1202                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &_x, 8, read_callback_, decoder))
1203                                 return false; /* the read_callback_ sets the state for us */
1204                         raw_header[raw_header_len++] = (FLAC__byte)_x;
1205                         x = (x << 8) | _x;
1206                 }
1207                 if(sample_rate_hint == 12)
1208                         decoder->private_->frame.header.sample_rate = x*1000;
1209                 else if(sample_rate_hint == 13)
1210                         decoder->private_->frame.header.sample_rate = x;
1211                 else
1212                         decoder->private_->frame.header.sample_rate = x*10;
1213         }
1214
1215         /* read the CRC-8 byte */
1216         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
1217                 return false; /* the read_callback_ sets the state for us */
1218         crc8 = (FLAC__byte)x;
1219
1220         if(FLAC__crc8(raw_header, raw_header_len) != crc8) {
1221                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private_->client_data);
1222                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1223                 return true;
1224         }
1225
1226         if(is_unparseable) {
1227                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1228                 return false;
1229         }
1230
1231         return true;
1232 }
1233
1234 FLAC__bool stream_decoder_read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1235 {
1236         FLAC__uint32 x;
1237         FLAC__bool wasted_bits;
1238
1239         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder)) /* MAGIC NUMBER */
1240                 return false; /* the read_callback_ sets the state for us */
1241
1242         wasted_bits = (x & 1);
1243         x &= 0xfe;
1244
1245         if(wasted_bits) {
1246                 unsigned u;
1247                 if(!FLAC__bitbuffer_read_unary_unsigned(&decoder->private_->input, &u, read_callback_, decoder))
1248                         return false; /* the read_callback_ sets the state for us */
1249                 decoder->private_->frame.subframes[channel].wasted_bits = u+1;
1250                 bps -= decoder->private_->frame.subframes[channel].wasted_bits;
1251         }
1252         else
1253                 decoder->private_->frame.subframes[channel].wasted_bits = 0;
1254
1255         /*
1256          * Lots of magic numbers here
1257          */
1258         if(x & 0x80) {
1259                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_LOST_SYNC, decoder->private_->client_data);
1260                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1261                 return true;
1262         }
1263         else if(x == 0) {
1264                 if(!stream_decoder_read_subframe_constant_(decoder, channel, bps))
1265                         return false;
1266         }
1267         else if(x == 2) {
1268                 if(!stream_decoder_read_subframe_verbatim_(decoder, channel, bps))
1269                         return false;
1270         }
1271         else if(x < 16) {
1272                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1273                 return false;
1274         }
1275         else if(x <= 24) {
1276                 if(!stream_decoder_read_subframe_fixed_(decoder, channel, bps, (x>>1)&7))
1277                         return false;
1278         }
1279         else if(x < 64) {
1280                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1281                 return false;
1282         }
1283         else {
1284                 if(!stream_decoder_read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1))
1285                         return false;
1286         }
1287
1288         if(wasted_bits) {
1289                 unsigned i;
1290                 x = decoder->private_->frame.subframes[channel].wasted_bits;
1291                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1292                         decoder->private_->output[channel][i] <<= x;
1293         }
1294
1295         return true;
1296 }
1297
1298 FLAC__bool stream_decoder_read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1299 {
1300         FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant;
1301         FLAC__int32 x;
1302         unsigned i;
1303         FLAC__int32 *output = decoder->private_->output[channel];
1304
1305         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT;
1306
1307         if(!FLAC__bitbuffer_read_raw_int32(&decoder->private_->input, &x, bps, read_callback_, decoder))
1308                 return false; /* the read_callback_ sets the state for us */
1309
1310         subframe->value = x;
1311
1312         /* decode the subframe */
1313         for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1314                 output[i] = x;
1315
1316         return true;
1317 }
1318
1319 FLAC__bool stream_decoder_read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order)
1320 {
1321         FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed;
1322         FLAC__int32 i32;
1323         FLAC__uint32 u32;
1324         unsigned u;
1325
1326         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED;
1327
1328         subframe->residual = decoder->private_->residual[channel];
1329         subframe->order = order;
1330
1331         /* read warm-up samples */
1332         for(u = 0; u < order; u++) {
1333                 if(!FLAC__bitbuffer_read_raw_int32(&decoder->private_->input, &i32, bps, read_callback_, decoder))
1334                         return false; /* the read_callback_ sets the state for us */
1335                 subframe->warmup[u] = i32;
1336         }
1337
1338         /* read entropy coding method info */
1339         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder))
1340                 return false; /* the read_callback_ sets the state for us */
1341         subframe->entropy_coding_method.type = u32;
1342         switch(subframe->entropy_coding_method.type) {
1343                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1344                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder))
1345                                 return false; /* the read_callback_ sets the state for us */
1346                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
1347                         break;
1348                 default:
1349                         decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1350                         return false;
1351         }
1352
1353         /* read residual */
1354         switch(subframe->entropy_coding_method.type) {
1355                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1356                         if(!stream_decoder_read_residual_partitioned_rice_(decoder, order, &subframe->entropy_coding_method.data.partitioned_rice, decoder->private_->residual[channel]))
1357                                 return false;
1358                         break;
1359                 default:
1360                         FLAC__ASSERT(0);
1361         }
1362
1363         /* decode the subframe */
1364         memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
1365         FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order);
1366
1367         return true;
1368 }
1369
1370 FLAC__bool stream_decoder_read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order)
1371 {
1372         FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc;
1373         FLAC__int32 i32;
1374         FLAC__uint32 u32;
1375         unsigned u;
1376
1377         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC;
1378
1379         subframe->residual = decoder->private_->residual[channel];
1380         subframe->order = order;
1381
1382         /* read warm-up samples */
1383         for(u = 0; u < order; u++) {
1384                 if(!FLAC__bitbuffer_read_raw_int32(&decoder->private_->input, &i32, bps, read_callback_, decoder))
1385                         return false; /* the read_callback_ sets the state for us */
1386                 subframe->warmup[u] = i32;
1387         }
1388
1389         /* read qlp coeff precision */
1390         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN, read_callback_, decoder))
1391                 return false; /* the read_callback_ sets the state for us */
1392         if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) {
1393                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_LOST_SYNC, decoder->private_->client_data);
1394                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1395                 return true;
1396         }
1397         subframe->qlp_coeff_precision = u32+1;
1398
1399         /* read qlp shift */
1400         if(!FLAC__bitbuffer_read_raw_int32(&decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN, read_callback_, decoder))
1401                 return false; /* the read_callback_ sets the state for us */
1402         subframe->quantization_level = i32;
1403
1404         /* read quantized lp coefficiencts */
1405         for(u = 0; u < order; u++) {
1406                 if(!FLAC__bitbuffer_read_raw_int32(&decoder->private_->input, &i32, subframe->qlp_coeff_precision, read_callback_, decoder))
1407                         return false; /* the read_callback_ sets the state for us */
1408                 subframe->qlp_coeff[u] = i32;
1409         }
1410
1411         /* read entropy coding method info */
1412         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder))
1413                 return false; /* the read_callback_ sets the state for us */
1414         subframe->entropy_coding_method.type = u32;
1415         switch(subframe->entropy_coding_method.type) {
1416                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1417                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder))
1418                                 return false; /* the read_callback_ sets the state for us */
1419                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
1420                         break;
1421                 default:
1422                         decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1423                         return false;
1424         }
1425
1426         /* read residual */
1427         switch(subframe->entropy_coding_method.type) {
1428                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1429                         if(!stream_decoder_read_residual_partitioned_rice_(decoder, order, &subframe->entropy_coding_method.data.partitioned_rice, decoder->private_->residual[channel]))
1430                                 return false;
1431                         break;
1432                 default:
1433                         FLAC__ASSERT(0);
1434         }
1435
1436         /* decode the subframe */
1437         memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
1438         if(bps <= 16 && subframe->qlp_coeff_precision <= 16)
1439                 decoder->private_->local_lpc_restore_signal_16bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
1440         else
1441                 decoder->private_->local_lpc_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
1442
1443         return true;
1444 }
1445
1446 FLAC__bool stream_decoder_read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1447 {
1448         FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim;
1449         FLAC__int32 x, *residual = decoder->private_->residual[channel];
1450         unsigned i;
1451
1452         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM;
1453
1454         subframe->data = residual;
1455
1456         for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
1457                 if(!FLAC__bitbuffer_read_raw_int32(&decoder->private_->input, &x, bps, read_callback_, decoder))
1458                         return false; /* the read_callback_ sets the state for us */
1459                 residual[i] = x;
1460         }
1461
1462         /* decode the subframe */
1463         memcpy(decoder->private_->output[channel], subframe->data, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
1464
1465         return true;
1466 }
1467
1468 FLAC__bool stream_decoder_read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, FLAC__EntropyCodingMethod_PartitionedRice *partitioned_rice, FLAC__int32 *residual)
1469 {
1470         FLAC__uint32 rice_parameter;
1471         int i;
1472         unsigned partition, sample, u;
1473         const unsigned partition_order = partitioned_rice->order;
1474         const unsigned partitions = 1u << partition_order;
1475         const unsigned partition_samples = partition_order > 0? decoder->private_->frame.header.blocksize >> partition_order : decoder->private_->frame.header.blocksize - predictor_order;
1476
1477         sample = 0;
1478         for(partition = 0; partition < partitions; partition++) {
1479                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN, read_callback_, decoder))
1480                         return false; /* the read_callback_ sets the state for us */
1481                 partitioned_rice->parameters[partition] = rice_parameter;
1482                 if(rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1483                         for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
1484 #ifdef FLAC__SYMMETRIC_RICE
1485                                 if(!FLAC__bitbuffer_read_symmetric_rice_signed(&decoder->private_->input, &i, rice_parameter, read_callback_, decoder))
1486                                         return false; /* the read_callback_ sets the state for us */
1487 #else
1488                                 if(!FLAC__bitbuffer_read_rice_signed(&decoder->private_->input, &i, rice_parameter, read_callback_, decoder))
1489                                         return false; /* the read_callback_ sets the state for us */
1490 #endif
1491                                 residual[sample] = i;
1492                         }
1493                 }
1494                 else {
1495                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN, read_callback_, decoder))
1496                                 return false; /* the read_callback_ sets the state for us */
1497                         partitioned_rice->raw_bits[partition] = rice_parameter;
1498                         for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
1499                                 if(!FLAC__bitbuffer_read_raw_int32(&decoder->private_->input, &i, rice_parameter, read_callback_, decoder))
1500                                         return false; /* the read_callback_ sets the state for us */
1501                                 residual[sample] = i;
1502                         }
1503                 }
1504         }
1505
1506         return true;
1507 }
1508
1509 FLAC__bool stream_decoder_read_zero_padding_(FLAC__StreamDecoder *decoder)
1510 {
1511         if(decoder->private_->input.consumed_bits != 0) {
1512                 FLAC__uint32 zero = 0;
1513                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &zero, 8-decoder->private_->input.consumed_bits, read_callback_, decoder))
1514                         return false; /* the read_callback_ sets the state for us */
1515                 if(zero != 0) {
1516                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_LOST_SYNC, decoder->private_->client_data);
1517                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1518                 }
1519         }
1520         return true;
1521 }
1522
1523 FLAC__bool read_callback_(FLAC__byte buffer[], unsigned *bytes, void *client_data)
1524 {
1525         FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data;
1526         FLAC__StreamDecoderReadStatus status;
1527         status = decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data);
1528         if(status == FLAC__STREAM_DECODER_READ_END_OF_STREAM)
1529                 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1530         else if(status == FLAC__STREAM_DECODER_READ_ABORT)
1531                 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
1532         return status == FLAC__STREAM_DECODER_READ_CONTINUE;
1533 }