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 byte ID3V2_TAG_[3] = { 'I', 'D', '3' };
  38
  39 /***********************************************************************
  40  *
  41  * Private class method prototypes
  42  *
  43  ***********************************************************************/
  44
  45 static bool stream_decoder_allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels);
  46 static bool stream_decoder_find_metadata_(FLAC__StreamDecoder *decoder);
  47 static bool stream_decoder_read_metadata_(FLAC__StreamDecoder *decoder);
  48 static bool stream_decoder_skip_id3v2_tag_(FLAC__StreamDecoder *decoder);
  49 static bool stream_decoder_frame_sync_(FLAC__StreamDecoder *decoder);
  50 static bool stream_decoder_read_frame_(FLAC__StreamDecoder *decoder, bool *got_a_frame);
  51 static bool stream_decoder_read_frame_header_(FLAC__StreamDecoder *decoder);
  52 static bool stream_decoder_read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  53 static bool stream_decoder_read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  54 static bool stream_decoder_read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order);
  55 static bool stream_decoder_read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order);
  56 static bool stream_decoder_read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  57 static bool stream_decoder_read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, unsigned partition_order, int32 *residual);
  58 static bool stream_decoder_read_zero_padding_(FLAC__StreamDecoder *decoder);
  59 static bool read_callback_(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, byte buffer[], unsigned *bytes, void *client_data);
  69         FLAC__StreamDecoderWriteStatus (*write_callback)(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const 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 int32 residual[], unsigned data_len, const int32 qlp_coeff[], unsigned order, int lp_quantization, int32 data[]);
  73         void (*local_lpc_restore_signal_16bit)(const int32 residual[], unsigned data_len, const int32 qlp_coeff[], unsigned order, int lp_quantization, int32 data[]);
  74         void *client_data;
  75         FLAC__BitBuffer input;
  76         int32 *output[FLAC__MAX_CHANNELS];
  77         int32 *residual[FLAC__MAX_CHANNELS];
  78         unsigned output_capacity, output_channels;
  79         uint32 last_frame_number;
  80         uint64 samples_decoded;
  81         bool has_stream_info, has_seek_table;
  82         FLAC__StreamMetaData stream_info;
  83         FLAC__StreamMetaData seek_table;
  84         FLAC__Frame frame;
  85         bool cached; /* true if there is a byte in lookahead */
  86         FLAC__CPUInfo cpuinfo;
  87         byte header_warmup[2]; /* contains the sync code and reserved bits */
  88         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_UNINITIALIZED"
 108 };
 109
 110 const char *FLAC__StreamDecoderReadStatusString[] = {
 111         "FLAC__STREAM_DECODER_READ_CONTINUE",
 112         "FLAC__STREAM_DECODER_READ_END_OF_STREAM",
 113         "FLAC__STREAM_DECODER_READ_ABORT"
 114 };
 115
 116 const char *FLAC__StreamDecoderWriteStatusString[] = {
 117         "FLAC__STREAM_DECODER_WRITE_CONTINUE",
 118         "FLAC__STREAM_DECODER_WRITE_ABORT"
 119 };
 120
 121 const char *FLAC__StreamDecoderErrorStatusString[] = {
 122         "FLAC__STREAM_DECODER_ERROR_LOST_SYNC",
 123         "FLAC__STREAM_DECODER_ERROR_BAD_HEADER",
 124         "FLAC__STREAM_DECODER_ERROR_FRAME_CRC_MISMATCH"
 125 };
 126
 127 /***********************************************************************
 128  *
 129  * Class constructor/destructor
 130  *
 131  ***********************************************************************/
 132 FLAC__StreamDecoder *FLAC__stream_decoder_new()
 133 {
 134         FLAC__StreamDecoder *decoder;
 135
 136         FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
 137
 138         decoder = (FLAC__StreamDecoder*)malloc(sizeof(FLAC__StreamDecoder));
 139         if(decoder == 0) {
 140                 return 0;
 141         }
 142         decoder->protected = (FLAC__StreamDecoderProtected*)malloc(sizeof(FLAC__StreamDecoderProtected));
 143         if(decoder->protected == 0) {
 144                 free(decoder);
 145                 return 0;
 146         }
 147         decoder->private = (FLAC__StreamDecoderPrivate*)malloc(sizeof(FLAC__StreamDecoderPrivate));
 148         if(decoder->private == 0) {
 149                 free(decoder->protected);
 150                 free(decoder);
 151                 return 0;
 152         }
 153
 154         decoder->protected->state = FLAC__STREAM_DECODER_UNINITIALIZED;
 155
 156         return decoder;
 157 }
 158
 159 void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder)
 160 {
 161         FLAC__ASSERT(decoder != 0);
 162         FLAC__ASSERT(decoder->protected != 0);
 163         FLAC__ASSERT(decoder->private != 0);
 164
 165         free(decoder->private);
 166         free(decoder->protected);
 167         free(decoder);
 168 }
 169
 170 /***********************************************************************
 171  *
 172  * Public class methods
 173  *
 174  ***********************************************************************/
 175
 176 FLAC__StreamDecoderState FLAC__stream_decoder_init(
 177         FLAC__StreamDecoder *decoder,
 178     FLAC__StreamDecoderReadStatus (*read_callback)(const FLAC__StreamDecoder *decoder, byte buffer[], unsigned *bytes, void *client_data),
 179     FLAC__StreamDecoderWriteStatus (*write_callback)(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const int32 *buffer[], void *client_data),
 180     void (*metadata_callback)(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data),
 181     void (*error_callback)(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data),
 182     void *client_data)
 183 {
 184         unsigned i;
 185
 186         FLAC__ASSERT(decoder != 0);
 187         FLAC__ASSERT(read_callback != 0);
 188         FLAC__ASSERT(write_callback != 0);
 189         FLAC__ASSERT(metadata_callback != 0);
 190         FLAC__ASSERT(error_callback != 0);
 191
 192         if(decoder->protected->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 193                 return decoder->protected->state = FLAC__STREAM_DECODER_ALREADY_INITIALIZED;
 194
 195         decoder->protected->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
 196
 197         decoder->private->read_callback = read_callback;
 198         decoder->private->write_callback = write_callback;
 199         decoder->private->metadata_callback = metadata_callback;
 200         decoder->private->error_callback = error_callback;
 201         decoder->private->client_data = client_data;
 202
 203         FLAC__bitbuffer_init(&decoder->private->input);
 204
 205         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 206                 decoder->private->output[i] = 0;
 207                 decoder->private->residual[i] = 0;
 208         }
 209
 210         decoder->private->output_capacity = 0;
 211         decoder->private->output_channels = 0;
 212         decoder->private->last_frame_number = 0;
 213         decoder->private->samples_decoded = 0;
 214         decoder->private->has_stream_info = false;
 215         decoder->private->has_seek_table = false;
 216         decoder->private->cached = false;
 217
 218         /*
 219          * get the CPU info and set the function pointers
 220          */
 221         FLAC__cpu_info(&decoder->private->cpuinfo);
 222         /* first default to the non-asm routines */
 223         decoder->private->local_lpc_restore_signal = FLAC__lpc_restore_signal;
 224         decoder->private->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal;
 225         /* now override with asm where appropriate */
 226 #ifndef FLAC__NO_ASM
 227         FLAC__ASSERT(decoder->private->cpuinfo.use_asm);
 228 #ifdef FLAC__CPU_IA32
 229         FLAC__ASSERT(decoder->private->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
 230 #ifdef FLAC__HAS_NASM
 231         if(decoder->private->cpuinfo.data.ia32.mmx) {
 232                 decoder->private->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_i386;
 233                 decoder->private->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_i386_mmx;
 234         }
 235         else {
 236                 decoder->private->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_i386;
 237                 decoder->private->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_i386;
 238         }
 239 #endif
 240 #endif
 241 #endif
 242
 243         return decoder->protected->state;
 244 }
 245
 246 void FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder)
 247 {
 248         unsigned i;
 249         FLAC__ASSERT(decoder != 0);
 250         if(decoder->protected->state == FLAC__STREAM_DECODER_UNINITIALIZED)
 251                 return;
 252         if(decoder->private->has_seek_table) {
 253                 free(decoder->private->seek_table.data.seek_table.points);
 254                 decoder->private->seek_table.data.seek_table.points = 0;
 255         }
 256         FLAC__bitbuffer_free(&decoder->private->input);
 257         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 258                 if(decoder->private->output[i] != 0) {
 259                         free(decoder->private->output[i]);
 260                         decoder->private->output[i] = 0;
 261                 }
 262                 if(decoder->private->residual[i] != 0) {
 263                         free(decoder->private->residual[i]);
 264                         decoder->private->residual[i] = 0;
 265                 }
 266         }
 267         decoder->protected->state = FLAC__STREAM_DECODER_UNINITIALIZED;
 268 }
 269
 270 FLAC__StreamDecoderState FLAC__stream_decoder_state(const FLAC__StreamDecoder *decoder)
 271 {
 272         return decoder->protected->state;
 273 }
 274
 275 unsigned FLAC__stream_decoder_channels(const FLAC__StreamDecoder *decoder)
 276 {
 277         return decoder->protected->channels;
 278 }
 279
 280 FLAC__ChannelAssignment FLAC__stream_decoder_channel_assignment(const FLAC__StreamDecoder *decoder)
 281 {
 282         return decoder->protected->channel_assignment;
 283 }
 284
 285 unsigned FLAC__stream_decoder_bits_per_sample(const FLAC__StreamDecoder *decoder)
 286 {
 287         return decoder->protected->bits_per_sample;
 288 }
 289
 290 unsigned FLAC__stream_decoder_sample_rate(const FLAC__StreamDecoder *decoder)
 291 {
 292         return decoder->protected->sample_rate;
 293 }
 294
 295 unsigned FLAC__stream_decoder_blocksize(const FLAC__StreamDecoder *decoder)
 296 {
 297         return decoder->protected->blocksize;
 298 }
 299
 300 bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder)
 301 {
 302         FLAC__ASSERT(decoder != 0);
 303
 304         if(!FLAC__bitbuffer_clear(&decoder->private->input)) {
 305                 decoder->protected->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 306                 return false;
 307         }
 308
 309         return true;
 310 }
 311
 312 bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder)
 313 {
 314         FLAC__ASSERT(decoder != 0);
 315
 316         if(!FLAC__stream_decoder_flush(decoder)) {
 317                 decoder->protected->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 318                 return false;
 319         }
 320         decoder->protected->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
 321
 322         decoder->private->samples_decoded = 0;
 323
 324         return true;
 325 }
 326
 327 bool FLAC__stream_decoder_process_whole_stream(FLAC__StreamDecoder *decoder)
 328 {
 329         bool dummy;
 330         FLAC__ASSERT(decoder != 0);
 331
 332         if(decoder->protected->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 333                 return true;
 334
 335         FLAC__ASSERT(decoder->protected->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA);
 336
 337         if(!FLAC__stream_decoder_reset(decoder)) {
 338                 decoder->protected->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 339                 return false;
 340         }
 341
 342         while(1) {
 343                 switch(decoder->protected->state) {
 344                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
 345                                 if(!stream_decoder_find_metadata_(decoder))
 346                                         return false; /* above function sets the status for us */
 347                                 break;
 348                         case FLAC__STREAM_DECODER_READ_METADATA:
 349                                 if(!stream_decoder_read_metadata_(decoder))
 350                                         return false; /* above function sets the status for us */
 351                                 break;
 352                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 353                                 if(!stream_decoder_frame_sync_(decoder))
 354                                         return true; /* above function sets the status for us */
 355                                 break;
 356                         case FLAC__STREAM_DECODER_READ_FRAME:
 357                                 if(!stream_decoder_read_frame_(decoder, &dummy))
 358                                         return false; /* above function sets the status for us */
 359                                 break;
 360                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 361                                 return true;
 362                         default:
 363                                 FLAC__ASSERT(0);
 364                 }
 365         }
 366 }
 367
 368 bool FLAC__stream_decoder_process_metadata(FLAC__StreamDecoder *decoder)
 369 {
 370         FLAC__ASSERT(decoder != 0);
 371
 372         if(decoder->protected->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 373                 return true;
 374
 375         FLAC__ASSERT(decoder->protected->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA);
 376
 377         if(!FLAC__stream_decoder_reset(decoder)) {
 378                 decoder->protected->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 379                 return false;
 380         }
 381
 382         while(1) {
 383                 switch(decoder->protected->state) {
 384                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
 385                                 if(!stream_decoder_find_metadata_(decoder))
 386                                         return false; /* above function sets the status for us */
 387                                 break;
 388                         case FLAC__STREAM_DECODER_READ_METADATA:
 389                                 if(!stream_decoder_read_metadata_(decoder))
 390                                         return false; /* above function sets the status for us */
 391                                 break;
 392                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 393                                 return true;
 394                                 break;
 395                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 396                                 return true;
 397                         default:
 398                                 FLAC__ASSERT(0);
 399                 }
 400         }
 401 }
 402
 403 bool FLAC__stream_decoder_process_one_frame(FLAC__StreamDecoder *decoder)
 404 {
 405         bool got_a_frame;
 406         FLAC__ASSERT(decoder != 0);
 407
 408         if(decoder->protected->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 409                 return true;
 410
 411         FLAC__ASSERT(decoder->protected->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC);
 412
 413         while(1) {
 414                 switch(decoder->protected->state) {
 415                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 416                                 if(!stream_decoder_frame_sync_(decoder))
 417                                         return true; /* above function sets the status for us */
 418                                 break;
 419                         case FLAC__STREAM_DECODER_READ_FRAME:
 420                                 if(!stream_decoder_read_frame_(decoder, &got_a_frame))
 421                                         return false; /* above function sets the status for us */
 422                                 if(got_a_frame)
 423                                         return true; /* above function sets the status for us */
 424                                 break;
 425                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 426                                 return true;
 427                         default:
 428                                 FLAC__ASSERT(0);
 429                 }
 430         }
 431 }
 432
 433 bool FLAC__stream_decoder_process_remaining_frames(FLAC__StreamDecoder *decoder)
 434 {
 435         bool dummy;
 436         FLAC__ASSERT(decoder != 0);
 437
 438         if(decoder->protected->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 439                 return true;
 440
 441         FLAC__ASSERT(decoder->protected->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC);
 442
 443         while(1) {
 444                 switch(decoder->protected->state) {
 445                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 446                                 if(!stream_decoder_frame_sync_(decoder))
 447                                         return true; /* above function sets the status for us */
 448                                 break;
 449                         case FLAC__STREAM_DECODER_READ_FRAME:
 450                                 if(!stream_decoder_read_frame_(decoder, &dummy))
 451                                         return false; /* above function sets the status for us */
 452                                 break;
 453                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 454                                 return true;
 455                         default:
 456                                 FLAC__ASSERT(0);
 457                 }
 458         }
 459 }
 460
 461 /***********************************************************************
 462  *
 463  * Protected class methods
 464  *
 465  ***********************************************************************/
 466
 467 unsigned FLAC__stream_decoder_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder)
 468 {
 469         FLAC__ASSERT(decoder != 0);
 470         return decoder->private->input.bytes - decoder->private->input.consumed_bytes;
 471 }
 472
 473 /***********************************************************************
 474  *
 475  * Private class methods
 476  *
 477  ***********************************************************************/
 478
 479 bool stream_decoder_allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels)
 480 {
 481         unsigned i;
 482         int32 *tmp;
 483
 484         if(size <= decoder->private->output_capacity && channels <= decoder->private->output_channels)
 485                 return true;
 486
 487         /* @@@ should change to use realloc() */
 488
 489         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 490                 if(decoder->private->output[i] != 0) {
 491                         free(decoder->private->output[i]);
 492                         decoder->private->output[i] = 0;
 493                 }
 494                 if(decoder->private->residual[i] != 0) {
 495                         free(decoder->private->residual[i]);
 496                         decoder->private->residual[i] = 0;
 497                 }
 498         }
 499
 500         for(i = 0; i < channels; i++) {
 501                 tmp = (int32*)malloc(sizeof(int32)*size);
 502                 if(tmp == 0) {
 503                         decoder->protected->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 504                         return false;
 505                 }
 506                 decoder->private->output[i] = tmp;
 507
 508                 tmp = (int32*)malloc(sizeof(int32)*size);
 509                 if(tmp == 0) {
 510                         decoder->protected->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 511                         return false;
 512                 }
 513                 decoder->private->residual[i] = tmp;
 514         }
 515
 516         decoder->private->output_capacity = size;
 517         decoder->private->output_channels = channels;
 518
 519         return true;
 520 }
 521
 522 bool stream_decoder_find_metadata_(FLAC__StreamDecoder *decoder)
 523 {
 524         uint32 x;
 525         unsigned i, id;
 526         bool first = true;
 527
 528         FLAC__ASSERT(decoder->private->input.consumed_bits == 0); /* make sure we're byte aligned */
 529
 530         for(i = id = 0; i < 4; ) {
 531                 if(decoder->private->cached) {
 532                         x = (uint32)decoder->private->lookahead;
 533                         decoder->private->cached = false;
 534                 }
 535                 else {
 536                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, 8, read_callback_, decoder))
 537                                 return false; /* the read_callback_ sets the state for us */
 538                 }
 539                 if(x == FLAC__STREAM_SYNC_STRING[i]) {
 540                         first = true;
 541                         i++;
 542                         id = 0;
 543                         continue;
 544                 }
 545                 if(x == ID3V2_TAG_[id]) {
 546                         id++;
 547                         i = 0;
 548                         if(id == 3) {
 549                                 if(!stream_decoder_skip_id3v2_tag_(decoder))
 550                                         return false; /* the read_callback_ sets the state for us */
 551                         }
 552                         continue;
 553                 }
 554                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 555                         decoder->private->header_warmup[0] = (byte)x;
 556                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, 8, read_callback_, decoder))
 557                                 return false; /* the read_callback_ sets the state for us */
 558
 559                         /* 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 */
 560                         /* else we have to check if the second byte is the end of a sync code */
 561                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 562                                 decoder->private->lookahead = (byte)x;
 563                                 decoder->private->cached = true;
 564                         }
 565                         else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
 566                                 decoder->private->header_warmup[1] = (byte)x;
 567                                 decoder->protected->state = FLAC__STREAM_DECODER_READ_FRAME;
 568                                 return true;
 569                         }
 570                 }
 571                 i = 0;
 572                 if(first) {
 573                         decoder->private->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_LOST_SYNC, decoder->private->client_data);
 574                         first = false;
 575                 }
 576         }
 577
 578         decoder->protected->state = FLAC__STREAM_DECODER_READ_METADATA;
 579         return true;
 580 }
 581
 582 bool stream_decoder_read_metadata_(FLAC__StreamDecoder *decoder)
 583 {
 584         uint32 i, x, last_block, type, length;
 585         uint64 xx;
 586
 587         FLAC__ASSERT(decoder->private->input.consumed_bits == 0); /* make sure we're byte aligned */
 588
 589         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &last_block, FLAC__STREAM_METADATA_IS_LAST_LEN, read_callback_, decoder))
 590                 return false; /* the read_callback_ sets the state for us */
 591         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &type, FLAC__STREAM_METADATA_TYPE_LEN, read_callback_, decoder))
 592                 return false; /* the read_callback_ sets the state for us */
 593         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN, read_callback_, decoder))
 594                 return false; /* the read_callback_ sets the state for us */
 595         if(type == FLAC__METADATA_TYPE_STREAMINFO) {
 596                 unsigned used_bits = 0;
 597                 decoder->private->stream_info.type = type;
 598                 decoder->private->stream_info.is_last = last_block;
 599                 decoder->private->stream_info.length = length;
 600
 601                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN, read_callback_, decoder))
 602                         return false; /* the read_callback_ sets the state for us */
 603                 decoder->private->stream_info.data.stream_info.min_blocksize = x;
 604                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN;
 605
 606                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN, read_callback_, decoder))
 607                         return false; /* the read_callback_ sets the state for us */
 608                 decoder->private->stream_info.data.stream_info.max_blocksize = x;
 609                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN;
 610
 611                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN, read_callback_, decoder))
 612                         return false; /* the read_callback_ sets the state for us */
 613                 decoder->private->stream_info.data.stream_info.min_framesize = x;
 614                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN;
 615
 616                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN, read_callback_, decoder))
 617                         return false; /* the read_callback_ sets the state for us */
 618                 decoder->private->stream_info.data.stream_info.max_framesize = x;
 619                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN;
 620
 621                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN, read_callback_, decoder))
 622                         return false; /* the read_callback_ sets the state for us */
 623                 decoder->private->stream_info.data.stream_info.sample_rate = x;
 624                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN;
 625
 626                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN, read_callback_, decoder))
 627                         return false; /* the read_callback_ sets the state for us */
 628                 decoder->private->stream_info.data.stream_info.channels = x+1;
 629                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN;
 630
 631                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN, read_callback_, decoder))
 632                         return false; /* the read_callback_ sets the state for us */
 633                 decoder->private->stream_info.data.stream_info.bits_per_sample = x+1;
 634                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN;
 635
 636                 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))
 637                         return false; /* the read_callback_ sets the state for us */
 638                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN;
 639
 640                 for(i = 0; i < 16; i++) {
 641                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, 8, read_callback_, decoder))
 642                                 return false; /* the read_callback_ sets the state for us */
 643                         decoder->private->stream_info.data.stream_info.md5sum[i] = (byte)x;
 644                 }
 645                 used_bits += i*8;
 646
 647                 /* skip the rest of the block */
 648                 FLAC__ASSERT(used_bits % 8 == 0);
 649                 length -= (used_bits / 8);
 650                 for(i = 0; i < length; i++) {
 651                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, 8, read_callback_, decoder))
 652                                 return false; /* the read_callback_ sets the state for us */
 653                 }
 654
 655                 decoder->private->has_stream_info = true;
 656                 decoder->private->metadata_callback(decoder, &decoder->private->stream_info, decoder->private->client_data);
 657         }
 658         else if(type == FLAC__METADATA_TYPE_SEEKTABLE) {
 659                 unsigned real_points;
 660
 661                 decoder->private->seek_table.type = type;
 662                 decoder->private->seek_table.is_last = last_block;
 663                 decoder->private->seek_table.length = length;
 664
 665                 decoder->private->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LEN;
 666
 667                 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)))) {
 668                         decoder->protected->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 669                         return false;
 670                 }
 671                 for(i = real_points = 0; i < decoder->private->seek_table.data.seek_table.num_points; i++) {
 672                         if(!FLAC__bitbuffer_read_raw_uint64(&decoder->private->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN, read_callback_, decoder))
 673                                 return false; /* the read_callback_ sets the state for us */
 674                         decoder->private->seek_table.data.seek_table.points[real_points].sample_number = xx;
 675
 676                         if(!FLAC__bitbuffer_read_raw_uint64(&decoder->private->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN, read_callback_, decoder))
 677                                 return false; /* the read_callback_ sets the state for us */
 678                         decoder->private->seek_table.data.seek_table.points[real_points].stream_offset = xx;
 679
 680                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN, read_callback_, decoder))
 681                                 return false; /* the read_callback_ sets the state for us */
 682                         decoder->private->seek_table.data.seek_table.points[real_points].frame_samples = x;
 683
 684                         if(decoder->private->seek_table.data.seek_table.points[real_points].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER)
 685                                 real_points++;
 686                 }
 687                 decoder->private->seek_table.data.seek_table.num_points = real_points;
 688
 689                 decoder->private->has_seek_table = true;
 690                 decoder->private->metadata_callback(decoder, &decoder->private->seek_table, decoder->private->client_data);
 691         }
 692         else {
 693                 /* skip other metadata blocks */
 694                 for(i = 0; i < length; i++) {
 695                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, 8, read_callback_, decoder))
 696                                 return false; /* the read_callback_ sets the state for us */
 697                 }
 698         }
 699
 700         if(last_block)
 701                 decoder->protected->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 702
 703         return true;
 704 }
 705
 706 bool stream_decoder_skip_id3v2_tag_(FLAC__StreamDecoder *decoder)
 707 {
 708         uint32 x;
 709         unsigned i, skip;
 710
 711         /* skip the version and flags bytes */
 712         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, 24, read_callback_, decoder))
 713                 return false; /* the read_callback_ sets the state for us */
 714         /* get the size (in bytes) to skip */
 715         skip = 0;
 716         for(i = 0; i < 4; i++) {
 717                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, 8, read_callback_, decoder))
 718                         return false; /* the read_callback_ sets the state for us */
 719                 skip <<= 7;
 720                 skip |= (x & 0x7f);
 721         }
 722         /* skip the rest of the tag */
 723         for(i = 0; i < skip; i++) {
 724                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, 8, read_callback_, decoder))
 725                         return false; /* the read_callback_ sets the state for us */
 726         }
 727         return true;
 728 }
 729
 730 bool stream_decoder_frame_sync_(FLAC__StreamDecoder *decoder)
 731 {
 732         uint32 x;
 733         bool first = true;
 734
 735         /* If we know the total number of samples in the stream, stop if we've read that many. */
 736         /* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */
 737         if(decoder->private->has_stream_info && decoder->private->stream_info.data.stream_info.total_samples) {
 738                 if(decoder->private->samples_decoded >= decoder->private->stream_info.data.stream_info.total_samples) {
 739                         decoder->protected->state = FLAC__STREAM_DECODER_END_OF_STREAM;
 740                         return true;
 741                 }
 742         }
 743
 744         /* make sure we're byte aligned */
 745         if(decoder->private->input.consumed_bits != 0) {
 746                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, 8-decoder->private->input.consumed_bits, read_callback_, decoder))
 747                         return false; /* the read_callback_ sets the state for us */
 748         }
 749
 750         while(1) {
 751                 if(decoder->private->cached) {
 752                         x = (uint32)decoder->private->lookahead;
 753                         decoder->private->cached = false;
 754                 }
 755                 else {
 756                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, 8, read_callback_, decoder))
 757                                 return false; /* the read_callback_ sets the state for us */
 758                 }
 759                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 760                         decoder->private->header_warmup[0] = (byte)x;
 761                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, 8, read_callback_, decoder))
 762                                 return false; /* the read_callback_ sets the state for us */
 763
 764                         /* 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 */
 765                         /* else we have to check if the second byte is the end of a sync code */
 766                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 767                                 decoder->private->lookahead = (byte)x;
 768                                 decoder->private->cached = true;
 769                         }
 770                         else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
 771                                 decoder->private->header_warmup[1] = (byte)x;
 772                                 decoder->protected->state = FLAC__STREAM_DECODER_READ_FRAME;
 773                                 return true;
 774                         }
 775                 }
 776                 if(first) {
 777                         decoder->private->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_LOST_SYNC, decoder->private->client_data);
 778                         first = 0;
 779                 }
 780         }
 781
 782         return true;
 783 }
 784
 785 bool stream_decoder_read_frame_(FLAC__StreamDecoder *decoder, bool *got_a_frame)
 786 {
 787         unsigned channel;
 788         unsigned i;
 789         int32 mid, side, left, right;
 790         uint16 frame_crc; /* the one we calculate from the input stream */
 791         uint32 x;
 792
 793         *got_a_frame = false;
 794
 795         /* init the CRC */
 796         frame_crc = 0;
 797         FLAC__CRC16_UPDATE(decoder->private->header_warmup[0], frame_crc);
 798         FLAC__CRC16_UPDATE(decoder->private->header_warmup[1], frame_crc);
 799         FLAC__bitbuffer_init_read_crc16(&decoder->private->input, frame_crc);
 800
 801         if(!stream_decoder_read_frame_header_(decoder))
 802                 return false;
 803         if(decoder->protected->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC)
 804                 return true;
 805         if(!stream_decoder_allocate_output_(decoder, decoder->private->frame.header.blocksize, decoder->private->frame.header.channels))
 806                 return false;
 807         for(channel = 0; channel < decoder->private->frame.header.channels; channel++) {
 808                 /*
 809                  * first figure the correct bits-per-sample of the subframe
 810                  */
 811                 unsigned bps = decoder->private->frame.header.bits_per_sample;
 812                 switch(decoder->private->frame.header.channel_assignment) {
 813                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
 814                                 /* no adjustment needed */
 815                                 break;
 816                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
 817                                 FLAC__ASSERT(decoder->private->frame.header.channels == 2);
 818                                 if(channel == 1)
 819                                         bps++;
 820                                 break;
 821                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
 822                                 FLAC__ASSERT(decoder->private->frame.header.channels == 2);
 823                                 if(channel == 0)
 824                                         bps++;
 825                                 break;
 826                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
 827                                 FLAC__ASSERT(decoder->private->frame.header.channels == 2);
 828                                 if(channel == 1)
 829                                         bps++;
 830                                 break;
 831                         default:
 832                                 FLAC__ASSERT(0);
 833                 }
 834                 /*
 835                  * now read it
 836                  */
 837                 if(!stream_decoder_read_subframe_(decoder, channel, bps))
 838                         return false;
 839                 if(decoder->protected->state != FLAC__STREAM_DECODER_READ_FRAME) {
 840                         decoder->protected->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 841                         return true;
 842                 }
 843         }
 844         if(!stream_decoder_read_zero_padding_(decoder))
 845                 return false;
 846
 847         /*
 848          * Read the frame CRC-16 from the footer and check
 849          */
 850         frame_crc = decoder->private->input.read_crc16;
 851         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, FLAC__FRAME_FOOTER_CRC_LEN, read_callback_, decoder))
 852                 return false; /* the read_callback_ sets the state for us */
 853         if(frame_crc == (uint16)x) {
 854                 /* Undo any special channel coding */
 855                 switch(decoder->private->frame.header.channel_assignment) {
 856                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
 857                                 /* do nothing */
 858                                 break;
 859                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
 860                                 FLAC__ASSERT(decoder->private->frame.header.channels == 2);
 861                                 for(i = 0; i < decoder->private->frame.header.blocksize; i++)
 862                                         decoder->private->output[1][i] = decoder->private->output[0][i] - decoder->private->output[1][i];
 863                                 break;
 864                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
 865                                 FLAC__ASSERT(decoder->private->frame.header.channels == 2);
 866                                 for(i = 0; i < decoder->private->frame.header.blocksize; i++)
 867                                         decoder->private->output[0][i] += decoder->private->output[1][i];
 868                                 break;
 869                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
 870                                 FLAC__ASSERT(decoder->private->frame.header.channels == 2);
 871                                 for(i = 0; i < decoder->private->frame.header.blocksize; i++) {
 872                                         mid = decoder->private->output[0][i];
 873                                         side = decoder->private->output[1][i];
 874                                         mid <<= 1;
 875                                         if(side & 1) /* i.e. if 'side' is odd... */
 876                                                 mid++;
 877                                         left = mid + side;
 878                                         right = mid - side;
 879                                         decoder->private->output[0][i] = left >> 1;
 880                                         decoder->private->output[1][i] = right >> 1;
 881                                 }
 882                                 break;
 883                         default:
 884                                 FLAC__ASSERT(0);
 885                                 break;
 886                 }
 887         }
 888         else {
 889                 /* Bad frame, emit error and zero the output signal */
 890                 decoder->private->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_FRAME_CRC_MISMATCH, decoder->private->client_data);
 891                 for(channel = 0; channel < decoder->private->frame.header.channels; channel++) {
 892                         memset(decoder->private->output[channel], 0, sizeof(int32) * decoder->private->frame.header.blocksize);
 893                 }
 894         }
 895
 896         *got_a_frame = true;
 897
 898         /* put the latest values into the public section of the decoder instance */
 899         decoder->protected->channels = decoder->private->frame.header.channels;
 900         decoder->protected->channel_assignment = decoder->private->frame.header.channel_assignment;
 901         decoder->protected->bits_per_sample = decoder->private->frame.header.bits_per_sample;
 902         decoder->protected->sample_rate = decoder->private->frame.header.sample_rate;
 903         decoder->protected->blocksize = decoder->private->frame.header.blocksize;
 904
 905         decoder->private->samples_decoded = decoder->private->frame.header.number.sample_number + decoder->private->frame.header.blocksize;
 906
 907         /* write it */
 908         /* 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: */
 909         if(decoder->private->write_callback(decoder, &decoder->private->frame, decoder->private->output, decoder->private->client_data) != FLAC__STREAM_DECODER_WRITE_CONTINUE)
 910                 return false;
 911
 912         decoder->protected->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 913         return true;
 914 }
 915
 916 bool stream_decoder_read_frame_header_(FLAC__StreamDecoder *decoder)
 917 {
 918         uint32 x;
 919         uint64 xx;
 920         unsigned i, blocksize_hint = 0, sample_rate_hint = 0;
 921         byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */
 922         unsigned raw_header_len;
 923         bool is_unparseable = false;
 924         const 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);
 925         const 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);
 926
 927         FLAC__ASSERT(decoder->private->input.consumed_bits == 0); /* make sure we're byte aligned */
 928
 929         /* init the raw header with the saved bits from synchronization */
 930         raw_header[0] = decoder->private->header_warmup[0];
 931         raw_header[1] = decoder->private->header_warmup[1];
 932         raw_header_len = 2;
 933
 934         /*
 935          * check to make sure that the reserved bits are 0
 936          */
 937         if(raw_header[1] & 0x03) { /* MAGIC NUMBER */
 938                 is_unparseable = true;
 939         }
 940
 941         /*
 942          * Note that along the way as we read the header, we look for a sync
 943          * code inside.  If we find one it would indicate that our original
 944          * sync was bad since there cannot be a sync code in a valid header.
 945          */
 946
 947         /*
 948          * read in the raw header as bytes so we can CRC it, and parse it on the way
 949          */
 950         for(i = 0; i < 2; i++) {
 951                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, 8, read_callback_, decoder))
 952                         return false; /* the read_callback_ sets the state for us */
 953                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 954                         /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */
 955                         decoder->private->lookahead = (byte)x;
 956                         decoder->private->cached = true;
 957                         decoder->private->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private->client_data);
 958                         decoder->protected->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 959                         return true;
 960                 }
 961                 raw_header[raw_header_len++] = (byte)x;
 962         }
 963
 964         switch(x = raw_header[2] >> 4) {
 965                 case 0:
 966                         if(is_known_fixed_blocksize_stream)
 967                                 decoder->private->frame.header.blocksize = decoder->private->stream_info.data.stream_info.min_blocksize;
 968                         else
 969                                 is_unparseable = true;
 970                         break;
 971                 case 1:
 972                         decoder->private->frame.header.blocksize = 192;
 973                         break;
 974                 case 2:
 975                 case 3:
 976                 case 4:
 977                 case 5:
 978                         decoder->private->frame.header.blocksize = 576 << (x-2);
 979                         break;
 980                 case 6:
 981                 case 7:
 982                         blocksize_hint = x;
 983                         break;
 984                 case 8:
 985                 case 9:
 986                 case 10:
 987                 case 11:
 988                 case 12:
 989                 case 13:
 990                 case 14:
 991                 case 15:
 992                         decoder->private->frame.header.blocksize = 256 << (x-8);
 993                         break;
 994                 default:
 995                         FLAC__ASSERT(0);
 996                         break;
 997         }
 998
 999         switch(x = raw_header[2] & 0x0f) {
1000                 case 0:
1001                         if(decoder->private->has_stream_info)
1002                                 decoder->private->frame.header.sample_rate = decoder->private->stream_info.data.stream_info.sample_rate;
1003                         else
1004                                 is_unparseable = true;
1005                         break;
1006                 case 1:
1007                 case 2:
1008                 case 3:
1009                         is_unparseable = true;
1010                         break;
1011                 case 4:
1012                         decoder->private->frame.header.sample_rate = 8000;
1013                         break;
1014                 case 5:
1015                         decoder->private->frame.header.sample_rate = 16000;
1016                         break;
1017                 case 6:
1018                         decoder->private->frame.header.sample_rate = 22050;
1019                         break;
1020                 case 7:
1021                         decoder->private->frame.header.sample_rate = 24000;
1022                         break;
1023                 case 8:
1024                         decoder->private->frame.header.sample_rate = 32000;
1025                         break;
1026                 case 9:
1027                         decoder->private->frame.header.sample_rate = 44100;
1028                         break;
1029                 case 10:
1030                         decoder->private->frame.header.sample_rate = 48000;
1031                         break;
1032                 case 11:
1033                         decoder->private->frame.header.sample_rate = 96000;
1034                         break;
1035                 case 12:
1036                 case 13:
1037                 case 14:
1038                         sample_rate_hint = x;
1039                         break;
1040                 case 15:
1041                         decoder->private->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private->client_data);
1042                         decoder->protected->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1043                         return true;
1044                 default:
1045                         FLAC__ASSERT(0);
1046         }
1047
1048         x = (unsigned)(raw_header[3] >> 4);
1049         if(x & 8) {
1050                 decoder->private->frame.header.channels = 2;
1051                 switch(x & 7) {
1052                         case 0:
1053                                 decoder->private->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE;
1054                                 break;
1055                         case 1:
1056                                 decoder->private->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE;
1057                                 break;
1058                         case 2:
1059                                 decoder->private->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE;
1060                                 break;
1061                         default:
1062                                 is_unparseable = true;
1063                                 break;
1064                 }
1065         }
1066         else {
1067                 decoder->private->frame.header.channels = (unsigned)x + 1;
1068                 decoder->private->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT;
1069         }
1070
1071         switch(x = (unsigned)(raw_header[3] & 0x0e) >> 1) {
1072                 case 0:
1073                         if(decoder->private->has_stream_info)
1074                                 decoder->private->frame.header.bits_per_sample = decoder->private->stream_info.data.stream_info.bits_per_sample;
1075                         else
1076                                 is_unparseable = true;
1077                         break;
1078                 case 1:
1079                         decoder->private->frame.header.bits_per_sample = 8;
1080                         break;
1081                 case 2:
1082                         decoder->private->frame.header.bits_per_sample = 12;
1083                         break;
1084                 case 4:
1085                         decoder->private->frame.header.bits_per_sample = 16;
1086                         break;
1087                 case 5:
1088                         decoder->private->frame.header.bits_per_sample = 20;
1089                         break;
1090                 case 6:
1091                         decoder->private->frame.header.bits_per_sample = 24;
1092                         break;
1093                 case 3:
1094                 case 7:
1095                         is_unparseable = true;
1096                         break;
1097                 default:
1098                         FLAC__ASSERT(0);
1099                         break;
1100         }
1101
1102         if(raw_header[3] & 0x01) { /* this should be a zero padding bit */
1103                 decoder->private->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private->client_data);
1104                 decoder->protected->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1105                 return true;
1106         }
1107
1108         if(blocksize_hint && is_known_variable_blocksize_stream) {
1109                 if(!FLAC__bitbuffer_read_utf8_uint64(&decoder->private->input, &xx, read_callback_, decoder, raw_header, &raw_header_len))
1110                         return false; /* the read_callback_ sets the state for us */
1111                 if(xx == 0xffffffffffffffff) { /* i.e. non-UTF8 code... */
1112                         decoder->private->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
1113                         decoder->private->cached = true;
1114                         decoder->private->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private->client_data);
1115                         decoder->protected->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1116                         return true;
1117                 }
1118                 decoder->private->frame.header.number.sample_number = xx;
1119         }
1120         else {
1121                 if(!FLAC__bitbuffer_read_utf8_uint32(&decoder->private->input, &x, read_callback_, decoder, raw_header, &raw_header_len))
1122                         return false; /* the read_callback_ sets the state for us */
1123                 if(x == 0xffffffff) { /* i.e. non-UTF8 code... */
1124                         decoder->private->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
1125                         decoder->private->cached = true;
1126                         decoder->private->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private->client_data);
1127                         decoder->protected->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1128                         return true;
1129                 }
1130                 decoder->private->last_frame_number = x;
1131                 if(decoder->private->has_stream_info) {
1132                         decoder->private->frame.header.number.sample_number = (int64)decoder->private->stream_info.data.stream_info.min_blocksize * (int64)x;
1133                 }
1134                 else {
1135                         is_unparseable = true;
1136                 }
1137         }
1138
1139         if(blocksize_hint) {
1140                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, 8, read_callback_, decoder))
1141                         return false; /* the read_callback_ sets the state for us */
1142                 raw_header[raw_header_len++] = (byte)x;
1143                 if(blocksize_hint == 7) {
1144                         uint32 _x;
1145                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &_x, 8, read_callback_, decoder))
1146                                 return false; /* the read_callback_ sets the state for us */
1147                         raw_header[raw_header_len++] = (byte)_x;
1148                         x = (x << 8) | _x;
1149                 }
1150                 decoder->private->frame.header.blocksize = x+1;
1151         }
1152
1153         if(sample_rate_hint) {
1154                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, 8, read_callback_, decoder))
1155                         return false; /* the read_callback_ sets the state for us */
1156                 raw_header[raw_header_len++] = (byte)x;
1157                 if(sample_rate_hint != 12) {
1158                         uint32 _x;
1159                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &_x, 8, read_callback_, decoder))
1160                                 return false; /* the read_callback_ sets the state for us */
1161                         raw_header[raw_header_len++] = (byte)_x;
1162                         x = (x << 8) | _x;
1163                 }
1164                 if(sample_rate_hint == 12)
1165                         decoder->private->frame.header.sample_rate = x*1000;
1166                 else if(sample_rate_hint == 13)
1167                         decoder->private->frame.header.sample_rate = x;
1168                 else
1169                         decoder->private->frame.header.sample_rate = x*10;
1170         }
1171
1172         /* read the CRC-8 byte */
1173         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, 8, read_callback_, decoder))
1174                 return false; /* the read_callback_ sets the state for us */
1175         crc8 = (byte)x;
1176
1177         if(FLAC__crc8(raw_header, raw_header_len) != crc8) {
1178                 decoder->private->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private->client_data);
1179                 decoder->protected->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1180                 return true;
1181         }
1182
1183         if(is_unparseable) {
1184                 decoder->protected->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1185                 return false;
1186         }
1187
1188         return true;
1189 }
1190
1191 bool stream_decoder_read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1192 {
1193         uint32 x;
1194         bool wasted_bits;
1195
1196         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &x, 8, read_callback_, decoder)) /* MAGIC NUMBER */
1197                 return false; /* the read_callback_ sets the state for us */
1198
1199         wasted_bits = (x & 1);
1200         x &= 0xfe;
1201
1202         if(wasted_bits) {
1203                 unsigned u;
1204                 if(!FLAC__bitbuffer_read_unary_unsigned(&decoder->private->input, &u, read_callback_, decoder))
1205                         return false; /* the read_callback_ sets the state for us */
1206                 decoder->private->frame.subframes[channel].wasted_bits = u+1;
1207                 bps -= decoder->private->frame.subframes[channel].wasted_bits;
1208         }
1209         else
1210                 decoder->private->frame.subframes[channel].wasted_bits = 0;
1211
1212         /*
1213          * Lots of magic numbers here
1214          */
1215         if(x & 0x80) {
1216                 decoder->private->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_LOST_SYNC, decoder->private->client_data);
1217                 decoder->protected->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1218                 return true;
1219         }
1220         else if(x == 0) {
1221                 if(!stream_decoder_read_subframe_constant_(decoder, channel, bps))
1222                         return false;
1223         }
1224         else if(x == 2) {
1225                 if(!stream_decoder_read_subframe_verbatim_(decoder, channel, bps))
1226                         return false;
1227         }
1228         else if(x < 16) {
1229                 decoder->protected->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1230                 return false;
1231         }
1232         else if(x <= 24) {
1233                 if(!stream_decoder_read_subframe_fixed_(decoder, channel, bps, (x>>1)&7))
1234                         return false;
1235         }
1236         else if(x < 64) {
1237                 decoder->protected->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1238                 return false;
1239         }
1240         else {
1241                 if(!stream_decoder_read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1))
1242                         return false;
1243         }
1244
1245         if(wasted_bits) {
1246                 unsigned i;
1247                 x = decoder->private->frame.subframes[channel].wasted_bits;
1248                 for(i = 0; i < decoder->private->frame.header.blocksize; i++)
1249                         decoder->private->output[channel][i] <<= x;
1250         }
1251
1252         return true;
1253 }
1254
1255 bool stream_decoder_read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1256 {
1257         FLAC__Subframe_Constant *subframe = &decoder->private->frame.subframes[channel].data.constant;
1258         int32 x;
1259         unsigned i;
1260         int32 *output = decoder->private->output[channel];
1261
1262         decoder->private->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT;
1263
1264         if(!FLAC__bitbuffer_read_raw_int32(&decoder->private->input, &x, bps, read_callback_, decoder))
1265                 return false; /* the read_callback_ sets the state for us */
1266
1267         subframe->value = x;
1268
1269         /* decode the subframe */
1270         for(i = 0; i < decoder->private->frame.header.blocksize; i++)
1271                 output[i] = x;
1272
1273         return true;
1274 }
1275
1276 bool stream_decoder_read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order)
1277 {
1278         FLAC__Subframe_Fixed *subframe = &decoder->private->frame.subframes[channel].data.fixed;
1279         int32 i32;
1280         uint32 u32;
1281         unsigned u;
1282
1283         decoder->private->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED;
1284
1285         subframe->residual = decoder->private->residual[channel];
1286         subframe->order = order;
1287
1288         /* read warm-up samples */
1289         for(u = 0; u < order; u++) {
1290                 if(!FLAC__bitbuffer_read_raw_int32(&decoder->private->input, &i32, bps, read_callback_, decoder))
1291                         return false; /* the read_callback_ sets the state for us */
1292                 subframe->warmup[u] = i32;
1293         }
1294
1295         /* read entropy coding method info */
1296         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder))
1297                 return false; /* the read_callback_ sets the state for us */
1298         subframe->entropy_coding_method.type = u32;
1299         switch(subframe->entropy_coding_method.type) {
1300                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1301                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder))
1302                                 return false; /* the read_callback_ sets the state for us */
1303                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
1304                         break;
1305                 default:
1306                         decoder->protected->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1307                         return false;
1308         }
1309
1310         /* read residual */
1311         switch(subframe->entropy_coding_method.type) {
1312                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1313                         if(!stream_decoder_read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, decoder->private->residual[channel]))
1314                                 return false;
1315                         break;
1316                 default:
1317                         FLAC__ASSERT(0);
1318         }
1319
1320         /* decode the subframe */
1321         memcpy(decoder->private->output[channel], subframe->warmup, sizeof(int32) * order);
1322         FLAC__fixed_restore_signal(decoder->private->residual[channel], decoder->private->frame.header.blocksize-order, order, decoder->private->output[channel]+order);
1323
1324         return true;
1325 }
1326
1327 bool stream_decoder_read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order)
1328 {
1329         FLAC__Subframe_LPC *subframe = &decoder->private->frame.subframes[channel].data.lpc;
1330         int32 i32;
1331         uint32 u32;
1332         unsigned u;
1333
1334         decoder->private->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC;
1335
1336         subframe->residual = decoder->private->residual[channel];
1337         subframe->order = order;
1338
1339         /* read warm-up samples */
1340         for(u = 0; u < order; u++) {
1341                 if(!FLAC__bitbuffer_read_raw_int32(&decoder->private->input, &i32, bps, read_callback_, decoder))
1342                         return false; /* the read_callback_ sets the state for us */
1343                 subframe->warmup[u] = i32;
1344         }
1345
1346         /* read qlp coeff precision */
1347         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN, read_callback_, decoder))
1348                 return false; /* the read_callback_ sets the state for us */
1349         if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) {
1350                 decoder->private->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_LOST_SYNC, decoder->private->client_data);
1351                 decoder->protected->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1352                 return true;
1353         }
1354         subframe->qlp_coeff_precision = u32+1;
1355
1356         /* read qlp shift */
1357         if(!FLAC__bitbuffer_read_raw_int32(&decoder->private->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN, read_callback_, decoder))
1358                 return false; /* the read_callback_ sets the state for us */
1359         subframe->quantization_level = i32;
1360
1361         /* read quantized lp coefficiencts */
1362         for(u = 0; u < order; u++) {
1363                 if(!FLAC__bitbuffer_read_raw_int32(&decoder->private->input, &i32, subframe->qlp_coeff_precision, read_callback_, decoder))
1364                         return false; /* the read_callback_ sets the state for us */
1365                 subframe->qlp_coeff[u] = i32;
1366         }
1367
1368         /* read entropy coding method info */
1369         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder))
1370                 return false; /* the read_callback_ sets the state for us */
1371         subframe->entropy_coding_method.type = u32;
1372         switch(subframe->entropy_coding_method.type) {
1373                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1374                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder))
1375                                 return false; /* the read_callback_ sets the state for us */
1376                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
1377                         break;
1378                 default:
1379                         decoder->protected->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1380                         return false;
1381         }
1382
1383         /* read residual */
1384         switch(subframe->entropy_coding_method.type) {
1385                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1386                         if(!stream_decoder_read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, decoder->private->residual[channel]))
1387                                 return false;
1388                         break;
1389                 default:
1390                         FLAC__ASSERT(0);
1391         }
1392
1393         /* decode the subframe */
1394         memcpy(decoder->private->output[channel], subframe->warmup, sizeof(int32) * order);
1395         if(bps <= 16 && subframe->qlp_coeff_precision <= 16)
1396                 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);
1397         else
1398                 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);
1399
1400         return true;
1401 }
1402
1403 bool stream_decoder_read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1404 {
1405         FLAC__Subframe_Verbatim *subframe = &decoder->private->frame.subframes[channel].data.verbatim;
1406         int32 x, *residual = decoder->private->residual[channel];
1407         unsigned i;
1408
1409         decoder->private->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM;
1410
1411         subframe->data = residual;
1412
1413         for(i = 0; i < decoder->private->frame.header.blocksize; i++) {
1414                 if(!FLAC__bitbuffer_read_raw_int32(&decoder->private->input, &x, bps, read_callback_, decoder))
1415                         return false; /* the read_callback_ sets the state for us */
1416                 residual[i] = x;
1417         }
1418
1419         /* decode the subframe */
1420         memcpy(decoder->private->output[channel], subframe->data, sizeof(int32) * decoder->private->frame.header.blocksize);
1421
1422         return true;
1423 }
1424
1425 bool stream_decoder_read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, unsigned partition_order, int32 *residual)
1426 {
1427         uint32 rice_parameter;
1428         int i;
1429         unsigned partition, sample, u;
1430         const unsigned partitions = 1u << partition_order;
1431         const unsigned partition_samples = partition_order > 0? decoder->private->frame.header.blocksize >> partition_order : decoder->private->frame.header.blocksize - predictor_order;
1432
1433         sample = 0;
1434         for(partition = 0; partition < partitions; partition++) {
1435                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN, read_callback_, decoder))
1436                         return false; /* the read_callback_ sets the state for us */
1437                 if(rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1438                         for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
1439 #ifdef FLAC__SYMMETRIC_RICE
1440                                 if(!FLAC__bitbuffer_read_symmetric_rice_signed(&decoder->private->input, &i, rice_parameter, read_callback_, decoder))
1441                                         return false; /* the read_callback_ sets the state for us */
1442 #else
1443                                 if(!FLAC__bitbuffer_read_rice_signed(&decoder->private->input, &i, rice_parameter, read_callback_, decoder))
1444                                         return false; /* the read_callback_ sets the state for us */
1445 #endif
1446                                 residual[sample] = i;
1447                         }
1448                 }
1449                 else {
1450                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN, read_callback_, decoder))
1451                                 return false; /* the read_callback_ sets the state for us */
1452                         for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
1453                                 if(!FLAC__bitbuffer_read_raw_int32(&decoder->private->input, &i, rice_parameter, read_callback_, decoder))
1454                                         return false; /* the read_callback_ sets the state for us */
1455                                 residual[sample] = i;
1456                         }
1457                 }
1458         }
1459
1460         return true;
1461 }
1462
1463 bool stream_decoder_read_zero_padding_(FLAC__StreamDecoder *decoder)
1464 {
1465         if(decoder->private->input.consumed_bits != 0) {
1466                 uint32 zero = 0;
1467                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private->input, &zero, 8-decoder->private->input.consumed_bits, read_callback_, decoder))
1468                         return false; /* the read_callback_ sets the state for us */
1469                 if(zero != 0) {
1470                         decoder->private->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_LOST_SYNC, decoder->private->client_data);
1471                         decoder->protected->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1472                 }
1473         }
1474         return true;
1475 }
1476
1477 bool read_callback_(byte buffer[], unsigned *bytes, void *client_data)
1478 {
1479         FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data;
1480         FLAC__StreamDecoderReadStatus status;
1481         status = decoder->private->read_callback(decoder, buffer, bytes, decoder->private->client_data);
1482         if(status == FLAC__STREAM_DECODER_READ_END_OF_STREAM)
1483                 decoder->protected->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1484         else if(status == FLAC__STREAM_DECODER_READ_ABORT)
1485                 decoder->protected->state = FLAC__STREAM_DECODER_ABORTED;
1486         return status == FLAC__STREAM_DECODER_READ_CONTINUE;
1487 }