src/libFLAC/stream_decoder.c

   1 /* libFLAC - Free Lossless Audio Codec library
   2  * Copyright (C) 2000,2001,2002  Josh Coalson
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA  02111-1307, USA.
  18  */
  19
  20 #include <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 void stream_decoder_set_defaults_(FLAC__StreamDecoder *decoder);
  46 static FLAC__bool stream_decoder_allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels);
  47 static FLAC__bool stream_decoder_has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id);
  48 static FLAC__bool stream_decoder_find_metadata_(FLAC__StreamDecoder *decoder);
  49 static FLAC__bool stream_decoder_read_metadata_(FLAC__StreamDecoder *decoder);
  50 static FLAC__bool stream_decoder_skip_id3v2_tag_(FLAC__StreamDecoder *decoder);
  51 static FLAC__bool stream_decoder_frame_sync_(FLAC__StreamDecoder *decoder);
  52 static FLAC__bool stream_decoder_read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame);
  53 static FLAC__bool stream_decoder_read_frame_header_(FLAC__StreamDecoder *decoder);
  54 static FLAC__bool stream_decoder_read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  55 static FLAC__bool stream_decoder_read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  56 static FLAC__bool stream_decoder_read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order);
  57 static FLAC__bool stream_decoder_read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order);
  58 static FLAC__bool stream_decoder_read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  59 static FLAC__bool stream_decoder_read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, FLAC__EntropyCodingMethod_PartitionedRice *partitioned_rice, FLAC__int32 *residual);
  60 static FLAC__bool stream_decoder_read_zero_padding_(FLAC__StreamDecoder *decoder);
  61 static FLAC__bool read_callback_(FLAC__byte buffer[], unsigned *bytes, void *client_data);
  62
  63 /***********************************************************************
  64  *
  65  * Private class data
  66  *
  67  ***********************************************************************/
  68
  69 typedef struct FLAC__StreamDecoderPrivate {
  70         FLAC__StreamDecoderReadStatus (*read_callback)(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data);
  71         FLAC__StreamDecoderWriteStatus (*write_callback)(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
  72         void (*metadata_callback)(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
  73         void (*error_callback)(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
  74         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[]);
  75         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[]);
  76         void *client_data;
  77         FLAC__BitBuffer *input;
  78         FLAC__int32 *output[FLAC__MAX_CHANNELS];
  79         FLAC__int32 *residual[FLAC__MAX_CHANNELS];
  80         unsigned output_capacity, output_channels;
  81         FLAC__uint32 last_frame_number;
  82         FLAC__uint64 samples_decoded;
  83         FLAC__bool has_stream_info, has_seek_table;
  84         FLAC__StreamMetadata stream_info;
  85         FLAC__StreamMetadata seek_table;
  86         FLAC__bool metadata_filter[FLAC__METADATA_TYPE_VORBIS_COMMENT+1];
  87         FLAC__byte *metadata_filter_ids;
  88         unsigned metadata_filter_ids_count, metadata_filter_ids_capacity; /* units for both are IDs, not bytes */
  89         FLAC__Frame frame;
  90         FLAC__bool cached; /* true if there is a byte in lookahead */
  91         FLAC__CPUInfo cpuinfo;
  92         FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */
  93         FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */
  94 } FLAC__StreamDecoderPrivate;
  95
  96 /***********************************************************************
  97  *
  98  * Public static class data
  99  *
 100  ***********************************************************************/
 101
 102 const char * const FLAC__StreamDecoderStateString[] = {
 103         "FLAC__STREAM_DECODER_SEARCH_FOR_METADATA",
 104         "FLAC__STREAM_DECODER_READ_METADATA",
 105         "FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC",
 106         "FLAC__STREAM_DECODER_READ_FRAME",
 107         "FLAC__STREAM_DECODER_END_OF_STREAM",
 108         "FLAC__STREAM_DECODER_ABORTED",
 109         "FLAC__STREAM_DECODER_UNPARSEABLE_STREAM",
 110         "FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR",
 111         "FLAC__STREAM_DECODER_ALREADY_INITIALIZED",
 112         "FLAC__STREAM_DECODER_INVALID_CALLBACK",
 113         "FLAC__STREAM_DECODER_UNINITIALIZED"
 114 };
 115
 116 const char * const FLAC__StreamDecoderReadStatusString[] = {
 117         "FLAC__STREAM_DECODER_READ_STATUS_CONTINUE",
 118         "FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM",
 119         "FLAC__STREAM_DECODER_READ_STATUS_ABORT"
 120 };
 121
 122 const char * const FLAC__StreamDecoderWriteStatusString[] = {
 123         "FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE",
 124         "FLAC__STREAM_DECODER_WRITE_STATUS_ABORT"
 125 };
 126
 127 const char * const FLAC__StreamDecoderErrorStatusString[] = {
 128         "FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC",
 129         "FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER",
 130         "FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH"
 131 };
 132
 133 /***********************************************************************
 134  *
 135  * Class constructor/destructor
 136  *
 137  ***********************************************************************/
 138 FLAC__StreamDecoder *FLAC__stream_decoder_new()
 139 {
 140         FLAC__StreamDecoder *decoder;
 141         unsigned i;
 142
 143         FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
 144
 145         decoder = (FLAC__StreamDecoder*)malloc(sizeof(FLAC__StreamDecoder));
 146         if(decoder == 0) {
 147                 return 0;
 148         }
 149         decoder->protected_ = (FLAC__StreamDecoderProtected*)malloc(sizeof(FLAC__StreamDecoderProtected));
 150         if(decoder->protected_ == 0) {
 151                 free(decoder);
 152                 return 0;
 153         }
 154         decoder->private_ = (FLAC__StreamDecoderPrivate*)malloc(sizeof(FLAC__StreamDecoderPrivate));
 155         if(decoder->private_ == 0) {
 156                 free(decoder->protected_);
 157                 free(decoder);
 158                 return 0;
 159         }
 160         decoder->private_->input = FLAC__bitbuffer_new();
 161         if(decoder->private_->input == 0) {
 162                 free(decoder->private_);
 163                 free(decoder->protected_);
 164                 free(decoder);
 165                 return 0;
 166         }
 167
 168         decoder->private_->metadata_filter_ids_capacity = 16;
 169         if(0 == (decoder->private_->metadata_filter_ids = malloc((FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) * decoder->private_->metadata_filter_ids_capacity))) {
 170                 FLAC__bitbuffer_delete(decoder->private_->input);
 171                 free(decoder->private_);
 172                 free(decoder->protected_);
 173                 free(decoder);
 174                 return 0;
 175         }
 176
 177         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 178                 decoder->private_->output[i] = 0;
 179                 decoder->private_->residual[i] = 0;
 180         }
 181
 182         decoder->private_->output_capacity = 0;
 183         decoder->private_->output_channels = 0;
 184         decoder->private_->has_seek_table = false;
 185
 186         stream_decoder_set_defaults_(decoder);
 187
 188         decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
 189
 190         return decoder;
 191 }
 192
 193 void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder)
 194 {
 195         FLAC__ASSERT(decoder != 0);
 196         FLAC__ASSERT(decoder->protected_ != 0);
 197         FLAC__ASSERT(decoder->private_ != 0);
 198         FLAC__ASSERT(decoder->private_->input != 0);
 199
 200         FLAC__stream_decoder_finish(decoder);
 201
 202         if(decoder->private_->metadata_filter_ids != 0)
 203                 free(decoder->private_->metadata_filter_ids);
 204
 205         FLAC__bitbuffer_delete(decoder->private_->input);
 206         free(decoder->private_);
 207         free(decoder->protected_);
 208         free(decoder);
 209 }
 210
 211 /***********************************************************************
 212  *
 213  * Public class methods
 214  *
 215  ***********************************************************************/
 216
 217 FLAC__StreamDecoderState FLAC__stream_decoder_init(FLAC__StreamDecoder *decoder)
 218 {
 219         FLAC__ASSERT(decoder != 0);
 220
 221         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 222                 return decoder->protected_->state = FLAC__STREAM_DECODER_ALREADY_INITIALIZED;
 223
 224         if(0 == decoder->private_->read_callback || 0 == decoder->private_->write_callback || 0 == decoder->private_->metadata_callback || 0 == decoder->private_->error_callback)
 225                 return decoder->protected_->state = FLAC__STREAM_DECODER_INVALID_CALLBACK;
 226
 227         if(!FLAC__bitbuffer_init(decoder->private_->input))
 228                 return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 229
 230         decoder->private_->last_frame_number = 0;
 231         decoder->private_->samples_decoded = 0;
 232         decoder->private_->has_stream_info = false;
 233         decoder->private_->cached = false;
 234
 235         /*
 236          * get the CPU info and set the function pointers
 237          */
 238         FLAC__cpu_info(&decoder->private_->cpuinfo);
 239         /* first default to the non-asm routines */
 240         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal;
 241         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal;
 242         /* now override with asm where appropriate */
 243 #ifndef FLAC__NO_ASM
 244         if(decoder->private_->cpuinfo.use_asm) {
 245 #ifdef FLAC__CPU_IA32
 246                 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
 247 #ifdef FLAC__HAS_NASM
 248                 if(decoder->private_->cpuinfo.data.ia32.mmx) {
 249                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
 250                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32_mmx;
 251                 }
 252                 else {
 253                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
 254                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32;
 255                 }
 256 #endif
 257 #endif
 258         }
 259 #endif
 260
 261         return decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
 262 }
 263
 264 void FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder)
 265 {
 266         unsigned i;
 267         FLAC__ASSERT(decoder != 0);
 268         if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
 269                 return;
 270         if(decoder->private_->has_seek_table) {
 271                 FLAC__ASSERT(decoder->private_->seek_table.data.seek_table.points != 0);
 272                 free(decoder->private_->seek_table.data.seek_table.points);
 273                 decoder->private_->seek_table.data.seek_table.points = 0;
 274                 decoder->private_->has_seek_table = false;
 275         }
 276         FLAC__bitbuffer_free(decoder->private_->input);
 277         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 278                 /* 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. */
 279                 if(decoder->private_->output[i] != 0) {
 280                         free(decoder->private_->output[i]-4);
 281                         decoder->private_->output[i] = 0;
 282                 }
 283                 if(decoder->private_->residual[i] != 0) {
 284                         free(decoder->private_->residual[i]);
 285                         decoder->private_->residual[i] = 0;
 286                 }
 287         }
 288         decoder->private_->output_capacity = 0;
 289         decoder->private_->output_channels = 0;
 290
 291         stream_decoder_set_defaults_(decoder);
 292
 293         decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
 294 }
 295
 296 FLAC__bool FLAC__stream_decoder_set_read_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderReadStatus (*value)(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data))
 297 {
 298         FLAC__ASSERT(decoder != 0);
 299         FLAC__ASSERT(decoder->private_ != 0);
 300         FLAC__ASSERT(decoder->protected_ != 0);
 301         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 302                 return false;
 303         decoder->private_->read_callback = value;
 304         return true;
 305 }
 306
 307 FLAC__bool FLAC__stream_decoder_set_write_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderWriteStatus (*value)(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data))
 308 {
 309         FLAC__ASSERT(decoder != 0);
 310         FLAC__ASSERT(decoder->private_ != 0);
 311         FLAC__ASSERT(decoder->protected_ != 0);
 312         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 313                 return false;
 314         decoder->private_->write_callback = value;
 315         return true;
 316 }
 317
 318 FLAC__bool FLAC__stream_decoder_set_metadata_callback(FLAC__StreamDecoder *decoder, void (*value)(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data))
 319 {
 320         FLAC__ASSERT(decoder != 0);
 321         FLAC__ASSERT(decoder->private_ != 0);
 322         FLAC__ASSERT(decoder->protected_ != 0);
 323         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 324                 return false;
 325         decoder->private_->metadata_callback = value;
 326         return true;
 327 }
 328
 329 FLAC__bool FLAC__stream_decoder_set_error_callback(FLAC__StreamDecoder *decoder, void (*value)(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data))
 330 {
 331         FLAC__ASSERT(decoder != 0);
 332         FLAC__ASSERT(decoder->private_ != 0);
 333         FLAC__ASSERT(decoder->protected_ != 0);
 334         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 335                 return false;
 336         decoder->private_->error_callback = value;
 337         return true;
 338 }
 339
 340 FLAC__bool FLAC__stream_decoder_set_client_data(FLAC__StreamDecoder *decoder, void *value)
 341 {
 342         FLAC__ASSERT(decoder != 0);
 343         FLAC__ASSERT(decoder->private_ != 0);
 344         FLAC__ASSERT(decoder->protected_ != 0);
 345         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 346                 return false;
 347         decoder->private_->client_data = value;
 348         return true;
 349 }
 350
 351 FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
 352 {
 353         FLAC__ASSERT(decoder != 0);
 354         FLAC__ASSERT(decoder->private_ != 0);
 355         FLAC__ASSERT(decoder->protected_ != 0);
 356         FLAC__ASSERT(type <= FLAC__METADATA_TYPE_VORBIS_COMMENT);
 357         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 358                 return false;
 359         decoder->private_->metadata_filter[type] = true;
 360         if(type == FLAC__METADATA_TYPE_APPLICATION)
 361                 decoder->private_->metadata_filter_ids_count = 0;
 362         return true;
 363 }
 364
 365 FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
 366 {
 367         FLAC__ASSERT(decoder != 0);
 368         FLAC__ASSERT(decoder->private_ != 0);
 369         FLAC__ASSERT(decoder->protected_ != 0);
 370         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 371                 return false;
 372
 373         if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
 374                 return true;
 375
 376         FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
 377
 378         if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
 379                 if(0 == (decoder->private_->metadata_filter_ids = realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2)))
 380                         return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 381                 decoder->private_->metadata_filter_ids_capacity *= 2;
 382         }
 383
 384         memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8));
 385         decoder->private_->metadata_filter_ids_count++;
 386
 387         return true;
 388 }
 389
 390 FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder)
 391 {
 392         unsigned i;
 393         FLAC__ASSERT(decoder != 0);
 394         FLAC__ASSERT(decoder->private_ != 0);
 395         FLAC__ASSERT(decoder->protected_ != 0);
 396         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 397                 return false;
 398         for(i = 0; i < sizeof(decoder->private_->metadata_filter) / sizeof(decoder->private_->metadata_filter[0]); i++)
 399                 decoder->private_->metadata_filter[i] = true;
 400         decoder->private_->metadata_filter_ids_count = 0;
 401         return true;
 402 }
 403
 404 FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
 405 {
 406         FLAC__ASSERT(decoder != 0);
 407         FLAC__ASSERT(decoder->private_ != 0);
 408         FLAC__ASSERT(decoder->protected_ != 0);
 409         FLAC__ASSERT(type <= FLAC__METADATA_TYPE_VORBIS_COMMENT);
 410         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 411                 return false;
 412         decoder->private_->metadata_filter[type] = false;
 413         if(type == FLAC__METADATA_TYPE_APPLICATION)
 414                 decoder->private_->metadata_filter_ids_count = 0;
 415         return true;
 416 }
 417
 418 FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
 419 {
 420         FLAC__ASSERT(decoder != 0);
 421         FLAC__ASSERT(decoder->private_ != 0);
 422         FLAC__ASSERT(decoder->protected_ != 0);
 423         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 424                 return false;
 425
 426         if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
 427                 return true;
 428
 429         FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
 430
 431         if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
 432                 if(0 == (decoder->private_->metadata_filter_ids = realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2)))
 433                         return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 434                 decoder->private_->metadata_filter_ids_capacity *= 2;
 435         }
 436
 437         memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8));
 438         decoder->private_->metadata_filter_ids_count++;
 439
 440         return true;
 441 }
 442
 443 FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder)
 444 {
 445         FLAC__ASSERT(decoder != 0);
 446         FLAC__ASSERT(decoder->private_ != 0);
 447         FLAC__ASSERT(decoder->protected_ != 0);
 448         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 449                 return false;
 450         memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
 451         decoder->private_->metadata_filter_ids_count = 0;
 452         return true;
 453 }
 454
 455 FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder)
 456 {
 457         FLAC__ASSERT(decoder != 0);
 458         FLAC__ASSERT(decoder->protected_ != 0);
 459         return decoder->protected_->state;
 460 }
 461
 462 unsigned FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder)
 463 {
 464         FLAC__ASSERT(decoder != 0);
 465         FLAC__ASSERT(decoder->protected_ != 0);
 466         return decoder->protected_->channels;
 467 }
 468
 469 FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder)
 470 {
 471         FLAC__ASSERT(decoder != 0);
 472         FLAC__ASSERT(decoder->protected_ != 0);
 473         return decoder->protected_->channel_assignment;
 474 }
 475
 476 unsigned FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder)
 477 {
 478         FLAC__ASSERT(decoder != 0);
 479         FLAC__ASSERT(decoder->protected_ != 0);
 480         return decoder->protected_->bits_per_sample;
 481 }
 482
 483 unsigned FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder)
 484 {
 485         FLAC__ASSERT(decoder != 0);
 486         FLAC__ASSERT(decoder->protected_ != 0);
 487         return decoder->protected_->sample_rate;
 488 }
 489
 490 unsigned FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder)
 491 {
 492         FLAC__ASSERT(decoder != 0);
 493         FLAC__ASSERT(decoder->protected_ != 0);
 494         return decoder->protected_->blocksize;
 495 }
 496
 497 FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder)
 498 {
 499         FLAC__ASSERT(decoder != 0);
 500         FLAC__ASSERT(decoder->private_ != 0);
 501         FLAC__ASSERT(decoder->protected_ != 0);
 502
 503         if(!FLAC__bitbuffer_clear(decoder->private_->input)) {
 504                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 505                 return false;
 506         }
 507         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 508
 509         return true;
 510 }
 511
 512 FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder)
 513 {
 514         FLAC__ASSERT(decoder != 0);
 515         FLAC__ASSERT(decoder->private_ != 0);
 516         FLAC__ASSERT(decoder->protected_ != 0);
 517
 518         if(!FLAC__stream_decoder_flush(decoder)) {
 519                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 520                 return false;
 521         }
 522         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
 523
 524         decoder->private_->samples_decoded = 0;
 525
 526         return true;
 527 }
 528
 529 FLAC__bool FLAC__stream_decoder_process_whole_stream(FLAC__StreamDecoder *decoder)
 530 {
 531         FLAC__bool dummy;
 532         FLAC__ASSERT(decoder != 0);
 533
 534         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 535                 return true;
 536
 537         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA);
 538
 539         if(!FLAC__stream_decoder_reset(decoder)) {
 540                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 541                 return false;
 542         }
 543
 544         while(1) {
 545                 switch(decoder->protected_->state) {
 546                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
 547                                 if(!stream_decoder_find_metadata_(decoder))
 548                                         return false; /* above function sets the status for us */
 549                                 break;
 550                         case FLAC__STREAM_DECODER_READ_METADATA:
 551                                 if(!stream_decoder_read_metadata_(decoder))
 552                                         return false; /* above function sets the status for us */
 553                                 break;
 554                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 555                                 if(!stream_decoder_frame_sync_(decoder))
 556                                         return true; /* above function sets the status for us */
 557                                 break;
 558                         case FLAC__STREAM_DECODER_READ_FRAME:
 559                                 if(!stream_decoder_read_frame_(decoder, &dummy))
 560                                         return false; /* above function sets the status for us */
 561                                 break;
 562                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 563                         case FLAC__STREAM_DECODER_ABORTED:
 564                                 return true;
 565                         default:
 566                                 FLAC__ASSERT(0);
 567                 }
 568         }
 569 }
 570
 571 FLAC__bool FLAC__stream_decoder_process_metadata(FLAC__StreamDecoder *decoder)
 572 {
 573         FLAC__ASSERT(decoder != 0);
 574
 575         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 576                 return true;
 577
 578         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA);
 579
 580         if(!FLAC__stream_decoder_reset(decoder)) {
 581                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 582                 return false;
 583         }
 584
 585         while(1) {
 586                 switch(decoder->protected_->state) {
 587                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
 588                                 if(!stream_decoder_find_metadata_(decoder))
 589                                         return false; /* above function sets the status for us */
 590                                 break;
 591                         case FLAC__STREAM_DECODER_READ_METADATA:
 592                                 if(!stream_decoder_read_metadata_(decoder))
 593                                         return false; /* above function sets the status for us */
 594                                 break;
 595                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 596                         case FLAC__STREAM_DECODER_READ_FRAME:
 597                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 598                         case FLAC__STREAM_DECODER_ABORTED:
 599                                 return true;
 600                         default:
 601                                 FLAC__ASSERT(0);
 602                 }
 603         }
 604 }
 605
 606 FLAC__bool FLAC__stream_decoder_process_one_frame(FLAC__StreamDecoder *decoder)
 607 {
 608         FLAC__bool got_a_frame;
 609         FLAC__ASSERT(decoder != 0);
 610
 611         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 612                 return true;
 613
 614         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC);
 615
 616         while(1) {
 617                 switch(decoder->protected_->state) {
 618                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 619                                 if(!stream_decoder_frame_sync_(decoder))
 620                                         return true; /* above function sets the status for us */
 621                                 break;
 622                         case FLAC__STREAM_DECODER_READ_FRAME:
 623                                 if(!stream_decoder_read_frame_(decoder, &got_a_frame))
 624                                         return false; /* above function sets the status for us */
 625                                 if(got_a_frame)
 626                                         return true; /* above function sets the status for us */
 627                                 break;
 628                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 629                         case FLAC__STREAM_DECODER_ABORTED:
 630                                 return true;
 631                         default:
 632                                 FLAC__ASSERT(0);
 633                 }
 634         }
 635 }
 636
 637 FLAC__bool FLAC__stream_decoder_process_remaining_frames(FLAC__StreamDecoder *decoder)
 638 {
 639         FLAC__bool dummy;
 640         FLAC__ASSERT(decoder != 0);
 641
 642         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 643                 return true;
 644
 645         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC);
 646
 647         while(1) {
 648                 switch(decoder->protected_->state) {
 649                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 650                                 if(!stream_decoder_frame_sync_(decoder))
 651                                         return true; /* above function sets the status for us */
 652                                 break;
 653                         case FLAC__STREAM_DECODER_READ_FRAME:
 654                                 if(!stream_decoder_read_frame_(decoder, &dummy))
 655                                         return false; /* above function sets the status for us */
 656                                 break;
 657                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 658                         case FLAC__STREAM_DECODER_ABORTED:
 659                                 return true;
 660                         default:
 661                                 FLAC__ASSERT(0);
 662                 }
 663         }
 664 }
 665
 666 /***********************************************************************
 667  *
 668  * Protected class methods
 669  *
 670  ***********************************************************************/
 671
 672 unsigned FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder)
 673 {
 674         FLAC__ASSERT(decoder != 0);
 675         return FLAC__bitbuffer_get_input_bytes_unconsumed(decoder->private_->input);
 676 }
 677
 678 /***********************************************************************
 679  *
 680  * Private class methods
 681  *
 682  ***********************************************************************/
 683
 684 void stream_decoder_set_defaults_(FLAC__StreamDecoder *decoder)
 685 {
 686         decoder->private_->read_callback = 0;
 687         decoder->private_->write_callback = 0;
 688         decoder->private_->metadata_callback = 0;
 689         decoder->private_->error_callback = 0;
 690         decoder->private_->client_data = 0;
 691
 692         memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
 693         decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] = true;
 694         decoder->private_->metadata_filter_ids_count = 0;
 695 }
 696
 697 FLAC__bool stream_decoder_allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels)
 698 {
 699         unsigned i;
 700         FLAC__int32 *tmp;
 701
 702         if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels)
 703                 return true;
 704
 705         /* @@@ should change to use realloc() */
 706
 707         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 708                 if(decoder->private_->output[i] != 0) {
 709                         free(decoder->private_->output[i]);
 710                         decoder->private_->output[i] = 0;
 711                 }
 712                 if(decoder->private_->residual[i] != 0) {
 713                         free(decoder->private_->residual[i]);
 714                         decoder->private_->residual[i] = 0;
 715                 }
 716         }
 717
 718         for(i = 0; i < channels; i++) {
 719                 /* 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. */
 720                 tmp = (FLAC__int32*)malloc(sizeof(FLAC__int32)*(size+4));
 721                 if(tmp == 0) {
 722                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 723                         return false;
 724                 }
 725                 memset(tmp, 0, sizeof(FLAC__int32)*4);
 726                 decoder->private_->output[i] = tmp + 4;
 727
 728                 tmp = (FLAC__int32*)malloc(sizeof(FLAC__int32)*size);
 729                 if(tmp == 0) {
 730                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 731                         return false;
 732                 }
 733                 decoder->private_->residual[i] = tmp;
 734         }
 735
 736         decoder->private_->output_capacity = size;
 737         decoder->private_->output_channels = channels;
 738
 739         return true;
 740 }
 741
 742 FLAC__bool stream_decoder_has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id)
 743 {
 744         unsigned i;
 745
 746         FLAC__ASSERT(0 != decoder);
 747         FLAC__ASSERT(0 != decoder->private_);
 748
 749         for(i = 0; i < decoder->private_->metadata_filter_ids_count; i++)
 750                 if(0 == memcmp(decoder->private_->metadata_filter_ids + i * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)))
 751                         return true;
 752
 753         return false;
 754 }
 755
 756 FLAC__bool stream_decoder_find_metadata_(FLAC__StreamDecoder *decoder)
 757 {
 758         FLAC__uint32 x;
 759         unsigned i, id;
 760         FLAC__bool first = true;
 761
 762         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
 763
 764         for(i = id = 0; i < 4; ) {
 765                 if(decoder->private_->cached) {
 766                         x = (FLAC__uint32)decoder->private_->lookahead;
 767                         decoder->private_->cached = false;
 768                 }
 769                 else {
 770                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
 771                                 return false; /* the read_callback_ sets the state for us */
 772                 }
 773                 if(x == FLAC__STREAM_SYNC_STRING[i]) {
 774                         first = true;
 775                         i++;
 776                         id = 0;
 777                         continue;
 778                 }
 779                 if(x == ID3V2_TAG_[id]) {
 780                         id++;
 781                         i = 0;
 782                         if(id == 3) {
 783                                 if(!stream_decoder_skip_id3v2_tag_(decoder))
 784                                         return false; /* the read_callback_ sets the state for us */
 785                         }
 786                         continue;
 787                 }
 788                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 789                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
 790                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
 791                                 return false; /* the read_callback_ sets the state for us */
 792
 793                         /* 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 */
 794                         /* else we have to check if the second byte is the end of a sync code */
 795                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 796                                 decoder->private_->lookahead = (FLAC__byte)x;
 797                                 decoder->private_->cached = true;
 798                         }
 799                         else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
 800                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
 801                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
 802                                 return true;
 803                         }
 804                 }
 805                 i = 0;
 806                 if(first) {
 807                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
 808                         first = false;
 809                 }
 810         }
 811
 812         decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA;
 813         return true;
 814 }
 815
 816 FLAC__bool stream_decoder_read_metadata_(FLAC__StreamDecoder *decoder)
 817 {
 818         FLAC__uint32 i, x, last_block, type, length;
 819         FLAC__uint64 xx;
 820
 821         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
 822
 823         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &last_block, FLAC__STREAM_METADATA_IS_LAST_LEN, read_callback_, decoder))
 824                 return false; /* the read_callback_ sets the state for us */
 825         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN, read_callback_, decoder))
 826                 return false; /* the read_callback_ sets the state for us */
 827         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN, read_callback_, decoder))
 828                 return false; /* the read_callback_ sets the state for us */
 829         if(type == FLAC__METADATA_TYPE_STREAMINFO) {
 830                 unsigned used_bits = 0;
 831                 decoder->private_->stream_info.type = type;
 832                 decoder->private_->stream_info.is_last = last_block;
 833                 decoder->private_->stream_info.length = length;
 834
 835                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN, read_callback_, decoder))
 836                         return false; /* the read_callback_ sets the state for us */
 837                 decoder->private_->stream_info.data.stream_info.min_blocksize = x;
 838                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN;
 839
 840                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN, read_callback_, decoder))
 841                         return false; /* the read_callback_ sets the state for us */
 842                 decoder->private_->stream_info.data.stream_info.max_blocksize = x;
 843                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN;
 844
 845                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN, read_callback_, decoder))
 846                         return false; /* the read_callback_ sets the state for us */
 847                 decoder->private_->stream_info.data.stream_info.min_framesize = x;
 848                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN;
 849
 850                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN, read_callback_, decoder))
 851                         return false; /* the read_callback_ sets the state for us */
 852                 decoder->private_->stream_info.data.stream_info.max_framesize = x;
 853                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN;
 854
 855                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN, read_callback_, decoder))
 856                         return false; /* the read_callback_ sets the state for us */
 857                 decoder->private_->stream_info.data.stream_info.sample_rate = x;
 858                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN;
 859
 860                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN, read_callback_, decoder))
 861                         return false; /* the read_callback_ sets the state for us */
 862                 decoder->private_->stream_info.data.stream_info.channels = x+1;
 863                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN;
 864
 865                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN, read_callback_, decoder))
 866                         return false; /* the read_callback_ sets the state for us */
 867                 decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1;
 868                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN;
 869
 870                 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))
 871                         return false; /* the read_callback_ sets the state for us */
 872                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN;
 873
 874                 if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, decoder->private_->stream_info.data.stream_info.md5sum, 16, read_callback_, decoder))
 875                         return false; /* the read_callback_ sets the state for us */
 876                 used_bits += 16*8;
 877
 878                 /* skip the rest of the block */
 879                 FLAC__ASSERT(used_bits % 8 == 0);
 880                 length -= (used_bits / 8);
 881                 if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, length, read_callback_, decoder))
 882                         return false; /* the read_callback_ sets the state for us */
 883
 884                 decoder->private_->has_stream_info = true;
 885                 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO])
 886                         decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data);
 887         }
 888         else if(type == FLAC__METADATA_TYPE_SEEKTABLE) {
 889                 decoder->private_->seek_table.type = type;
 890                 decoder->private_->seek_table.is_last = last_block;
 891                 decoder->private_->seek_table.length = length;
 892
 893                 decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
 894
 895                 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)))) {
 896                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 897                         return false;
 898                 }
 899                 for(i = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) {
 900                         if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN, read_callback_, decoder))
 901                                 return false; /* the read_callback_ sets the state for us */
 902                         decoder->private_->seek_table.data.seek_table.points[i].sample_number = xx;
 903
 904                         if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN, read_callback_, decoder))
 905                                 return false; /* the read_callback_ sets the state for us */
 906                         decoder->private_->seek_table.data.seek_table.points[i].stream_offset = xx;
 907
 908                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN, read_callback_, decoder))
 909                                 return false; /* the read_callback_ sets the state for us */
 910                         decoder->private_->seek_table.data.seek_table.points[i].frame_samples = x;
 911                 }
 912                 length -= (decoder->private_->seek_table.data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH);
 913                 /* if there is a partial point left, skip over it */
 914                 if(length > 0) {
 915                         /*@@@ do an error_callback() here?  there's an argument for either way */
 916                         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, length, read_callback_, decoder))
 917                                 return false; /* the read_callback_ sets the state for us */
 918                 }
 919
 920                 decoder->private_->has_seek_table = true;
 921                 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_SEEKTABLE])
 922                         decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data);
 923         }
 924         else {
 925                 FLAC__bool skip_it = !decoder->private_->metadata_filter[type];
 926                 unsigned real_length = length;
 927                 FLAC__StreamMetadata block;
 928
 929                 block.is_last = last_block;
 930                 block.type = type;
 931                 block.length = length;
 932
 933                 if(type == FLAC__METADATA_TYPE_APPLICATION) {
 934                         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, block.data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8, read_callback_, decoder))
 935                                 return false; /* the read_callback_ sets the state for us */
 936
 937                         real_length -= FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8;
 938
 939                         if(decoder->private_->metadata_filter_ids_count > 0 && stream_decoder_has_id_filtered_(decoder, block.data.application.id))
 940                                 skip_it = !skip_it;
 941                 }
 942
 943                 if(skip_it) {
 944                         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, real_length, read_callback_, decoder))
 945                                 return false; /* the read_callback_ sets the state for us */
 946                 }
 947                 else {
 948                         switch(type) {
 949                                 case FLAC__METADATA_TYPE_PADDING:
 950                                         /* skip the padding bytes */
 951                                         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, real_length, read_callback_, decoder))
 952                                                 return false; /* the read_callback_ sets the state for us */
 953                                         break;
 954                                 case FLAC__METADATA_TYPE_APPLICATION:
 955                                         /* remember, we read the ID already */
 956                                         if(real_length > 0) {
 957                                                 if(0 == (block.data.application.data = malloc(real_length))) {
 958                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 959                                                         return false;
 960                                                 }
 961                                                 if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, block.data.application.data, real_length, read_callback_, decoder))
 962                                                         return false; /* the read_callback_ sets the state for us */
 963                                         }
 964                                         else
 965                                                 block.data.application.data = 0;
 966                                         break;
 967                                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 968                                         /* read vendor string */
 969                                         FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
 970                                         if(!FLAC__bitbuffer_read_raw_uint32_little_endian(decoder->private_->input, &block.data.vorbis_comment.vendor_string.length, read_callback_, decoder))
 971                                                 return false; /* the read_callback_ sets the state for us */
 972                                         if(block.data.vorbis_comment.vendor_string.length > 0) {
 973                                                 if(0 == (block.data.vorbis_comment.vendor_string.entry = malloc(block.data.vorbis_comment.vendor_string.length))) {
 974                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 975                                                         return false;
 976                                                 }
 977                                                 if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, block.data.vorbis_comment.vendor_string.entry, block.data.vorbis_comment.vendor_string.length, read_callback_, decoder))
 978                                                         return false; /* the read_callback_ sets the state for us */
 979                                         }
 980                                         else
 981                                                 block.data.vorbis_comment.vendor_string.entry = 0;
 982
 983                                         /* read num comments */
 984                                         FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN == 32);
 985                                         if(!FLAC__bitbuffer_read_raw_uint32_little_endian(decoder->private_->input, &block.data.vorbis_comment.num_comments, read_callback_, decoder))
 986                                                 return false; /* the read_callback_ sets the state for us */
 987
 988                                         /* read comments */
 989                                         if(block.data.vorbis_comment.num_comments > 0) {
 990                                                 if(0 == (block.data.vorbis_comment.comments = malloc(block.data.vorbis_comment.num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) {
 991                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 992                                                         return false;
 993                                                 }
 994                                                 for(i = 0; i < block.data.vorbis_comment.num_comments; i++) {
 995                                                         FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
 996                                                         if(!FLAC__bitbuffer_read_raw_uint32_little_endian(decoder->private_->input, &block.data.vorbis_comment.comments[i].length, read_callback_, decoder))
 997                                                                 return false; /* the read_callback_ sets the state for us */
 998                                                         if(block.data.vorbis_comment.comments[i].length > 0) {
 999                                                                 if(0 == (block.data.vorbis_comment.comments[i].entry = malloc(block.data.vorbis_comment.comments[i].length))) {
1000                                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1001                                                                         return false;
1002                                                                 }
1003                                                                 if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, block.data.vorbis_comment.comments[i].entry, block.data.vorbis_comment.comments[i].length, read_callback_, decoder))
1004                                                                         return false; /* the read_callback_ sets the state for us */
1005                                                         }
1006                                                         else
1007                                                                 block.data.vorbis_comment.comments[i].entry = 0;
1008                                                 }
1009                                         }
1010                                         else {
1011                                                 block.data.vorbis_comment.comments = 0;
1012                                         }
1013                                         break;
1014                                 case FLAC__METADATA_TYPE_STREAMINFO:
1015                                 case FLAC__METADATA_TYPE_SEEKTABLE:
1016                                 default:
1017                                         FLAC__ASSERT(0);
1018                         }
1019                         decoder->private_->metadata_callback(decoder, &block, decoder->private_->client_data);
1020
1021                         /* now we have to free any malloc'ed data in the block */
1022                         switch(type) {
1023                                 case FLAC__METADATA_TYPE_PADDING:
1024                                         break;
1025                                 case FLAC__METADATA_TYPE_APPLICATION:
1026                                         if(0 != block.data.application.data)
1027                                                 free(block.data.application.data);
1028                                         break;
1029                                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1030                                         if(0 != block.data.vorbis_comment.vendor_string.entry)
1031                                                 free(block.data.vorbis_comment.vendor_string.entry);
1032                                         if(block.data.vorbis_comment.num_comments > 0)
1033                                                 for(i = 0; i < block.data.vorbis_comment.num_comments; i++)
1034                                                         if(0 != block.data.vorbis_comment.comments[i].entry)
1035                                                                 free(block.data.vorbis_comment.comments[i].entry);
1036                                         if(0 != block.data.vorbis_comment.comments)
1037                                                 free(block.data.vorbis_comment.comments);
1038                                         break;
1039                                 case FLAC__METADATA_TYPE_STREAMINFO:
1040                                 case FLAC__METADATA_TYPE_SEEKTABLE:
1041                                 default:
1042                                         FLAC__ASSERT(0);
1043                         }
1044                 }
1045         }
1046
1047         if(last_block)
1048                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1049
1050         return true;
1051 }
1052
1053 FLAC__bool stream_decoder_skip_id3v2_tag_(FLAC__StreamDecoder *decoder)
1054 {
1055         FLAC__uint32 x;
1056         unsigned i, skip;
1057
1058         /* skip the version and flags bytes */
1059         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 24, read_callback_, decoder))
1060                 return false; /* the read_callback_ sets the state for us */
1061         /* get the size (in bytes) to skip */
1062         skip = 0;
1063         for(i = 0; i < 4; i++) {
1064                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1065                         return false; /* the read_callback_ sets the state for us */
1066                 skip <<= 7;
1067                 skip |= (x & 0x7f);
1068         }
1069         /* skip the rest of the tag */
1070         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, skip, read_callback_, decoder))
1071                 return false; /* the read_callback_ sets the state for us */
1072         return true;
1073 }
1074
1075 FLAC__bool stream_decoder_frame_sync_(FLAC__StreamDecoder *decoder)
1076 {
1077         FLAC__uint32 x;
1078         FLAC__bool first = true;
1079
1080         /* If we know the total number of samples in the stream, stop if we've read that many. */
1081         /* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */
1082         if(decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.total_samples) {
1083                 if(decoder->private_->samples_decoded >= decoder->private_->stream_info.data.stream_info.total_samples) {
1084                         decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1085                         return true;
1086                 }
1087         }
1088
1089         /* make sure we're byte aligned */
1090         if(!FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input)) {
1091                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__bitbuffer_bits_left_for_byte_alignment(decoder->private_->input), read_callback_, decoder))
1092                         return false; /* the read_callback_ sets the state for us */
1093         }
1094
1095         while(1) {
1096                 if(decoder->private_->cached) {
1097                         x = (FLAC__uint32)decoder->private_->lookahead;
1098                         decoder->private_->cached = false;
1099                 }
1100                 else {
1101                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1102                                 return false; /* the read_callback_ sets the state for us */
1103                 }
1104                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1105                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
1106                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1107                                 return false; /* the read_callback_ sets the state for us */
1108
1109                         /* 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 */
1110                         /* else we have to check if the second byte is the end of a sync code */
1111                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1112                                 decoder->private_->lookahead = (FLAC__byte)x;
1113                                 decoder->private_->cached = true;
1114                         }
1115                         else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
1116                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
1117                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
1118                                 return true;
1119                         }
1120                 }
1121                 if(first) {
1122                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1123                         first = false;
1124                 }
1125         }
1126
1127         return true;
1128 }
1129
1130 FLAC__bool stream_decoder_read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame)
1131 {
1132         unsigned channel;
1133         unsigned i;
1134         FLAC__int32 mid, side, left, right;
1135         FLAC__uint16 frame_crc; /* the one we calculate from the input stream */
1136         FLAC__uint32 x;
1137
1138         *got_a_frame = false;
1139
1140         /* init the CRC */
1141         frame_crc = 0;
1142         FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc);
1143         FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc);
1144         FLAC__bitbuffer_reset_read_crc16(decoder->private_->input, frame_crc);
1145
1146         if(!stream_decoder_read_frame_header_(decoder))
1147                 return false;
1148         if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC)
1149                 return true;
1150         if(!stream_decoder_allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels))
1151                 return false;
1152         for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
1153                 /*
1154                  * first figure the correct bits-per-sample of the subframe
1155                  */
1156                 unsigned bps = decoder->private_->frame.header.bits_per_sample;
1157                 switch(decoder->private_->frame.header.channel_assignment) {
1158                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1159                                 /* no adjustment needed */
1160                                 break;
1161                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1162                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1163                                 if(channel == 1)
1164                                         bps++;
1165                                 break;
1166                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1167                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1168                                 if(channel == 0)
1169                                         bps++;
1170                                 break;
1171                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1172                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1173                                 if(channel == 1)
1174                                         bps++;
1175                                 break;
1176                         default:
1177                                 FLAC__ASSERT(0);
1178                 }
1179                 /*
1180                  * now read it
1181                  */
1182                 if(!stream_decoder_read_subframe_(decoder, channel, bps))
1183                         return false;
1184                 if(decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME) {
1185                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1186                         return true;
1187                 }
1188         }
1189         if(!stream_decoder_read_zero_padding_(decoder))
1190                 return false;
1191
1192         /*
1193          * Read the frame CRC-16 from the footer and check
1194          */
1195         frame_crc = FLAC__bitbuffer_get_read_crc16(decoder->private_->input);
1196         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN, read_callback_, decoder))
1197                 return false; /* the read_callback_ sets the state for us */
1198         if(frame_crc == (FLAC__uint16)x) {
1199                 /* Undo any special channel coding */
1200                 switch(decoder->private_->frame.header.channel_assignment) {
1201                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1202                                 /* do nothing */
1203                                 break;
1204                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1205                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1206                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1207                                         decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i];
1208                                 break;
1209                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1210                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1211                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1212                                         decoder->private_->output[0][i] += decoder->private_->output[1][i];
1213                                 break;
1214                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1215                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1216                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
1217                                         mid = decoder->private_->output[0][i];
1218                                         side = decoder->private_->output[1][i];
1219                                         mid <<= 1;
1220                                         if(side & 1) /* i.e. if 'side' is odd... */
1221                                                 mid++;
1222                                         left = mid + side;
1223                                         right = mid - side;
1224                                         decoder->private_->output[0][i] = left >> 1;
1225                                         decoder->private_->output[1][i] = right >> 1;
1226                                 }
1227                                 break;
1228                         default:
1229                                 FLAC__ASSERT(0);
1230                                 break;
1231                 }
1232         }
1233         else {
1234                 /* Bad frame, emit error and zero the output signal */
1235                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH, decoder->private_->client_data);
1236                 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
1237                         memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
1238                 }
1239         }
1240
1241         *got_a_frame = true;
1242
1243         /* put the latest values into the public section of the decoder instance */
1244         decoder->protected_->channels = decoder->private_->frame.header.channels;
1245         decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment;
1246         decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample;
1247         decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate;
1248         decoder->protected_->blocksize = decoder->private_->frame.header.blocksize;
1249
1250         FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
1251         decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize;
1252
1253         /* write it */
1254         if(decoder->private_->write_callback(decoder, &decoder->private_->frame, (const FLAC__int32 * const *)decoder->private_->output, decoder->private_->client_data) != FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE)
1255                 return false;
1256
1257         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1258         return true;
1259 }
1260
1261 FLAC__bool stream_decoder_read_frame_header_(FLAC__StreamDecoder *decoder)
1262 {
1263         FLAC__uint32 x;
1264         FLAC__uint64 xx;
1265         unsigned i, blocksize_hint = 0, sample_rate_hint = 0;
1266         FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */
1267         unsigned raw_header_len;
1268         FLAC__bool is_unparseable = false;
1269         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);
1270         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);
1271
1272         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
1273
1274         /* init the raw header with the saved bits from synchronization */
1275         raw_header[0] = decoder->private_->header_warmup[0];
1276         raw_header[1] = decoder->private_->header_warmup[1];
1277         raw_header_len = 2;
1278
1279         /*
1280          * check to make sure that the reserved bits are 0
1281          */
1282         if(raw_header[1] & 0x03) { /* MAGIC NUMBER */
1283                 is_unparseable = true;
1284         }
1285
1286         /*
1287          * Note that along the way as we read the header, we look for a sync
1288          * code inside.  If we find one it would indicate that our original
1289          * sync was bad since there cannot be a sync code in a valid header.
1290          */
1291
1292         /*
1293          * read in the raw header as bytes so we can CRC it, and parse it on the way
1294          */
1295         for(i = 0; i < 2; i++) {
1296                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1297                         return false; /* the read_callback_ sets the state for us */
1298                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1299                         /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */
1300                         decoder->private_->lookahead = (FLAC__byte)x;
1301                         decoder->private_->cached = true;
1302                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1303                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1304                         return true;
1305                 }
1306                 raw_header[raw_header_len++] = (FLAC__byte)x;
1307         }
1308
1309         switch(x = raw_header[2] >> 4) {
1310                 case 0:
1311                         if(is_known_fixed_blocksize_stream)
1312                                 decoder->private_->frame.header.blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize;
1313                         else
1314                                 is_unparseable = true;
1315                         break;
1316                 case 1:
1317                         decoder->private_->frame.header.blocksize = 192;
1318                         break;
1319                 case 2:
1320                 case 3:
1321                 case 4:
1322                 case 5:
1323                         decoder->private_->frame.header.blocksize = 576 << (x-2);
1324                         break;
1325                 case 6:
1326                 case 7:
1327                         blocksize_hint = x;
1328                         break;
1329                 case 8:
1330                 case 9:
1331                 case 10:
1332                 case 11:
1333                 case 12:
1334                 case 13:
1335                 case 14:
1336                 case 15:
1337                         decoder->private_->frame.header.blocksize = 256 << (x-8);
1338                         break;
1339                 default:
1340                         FLAC__ASSERT(0);
1341                         break;
1342         }
1343
1344         switch(x = raw_header[2] & 0x0f) {
1345                 case 0:
1346                         if(decoder->private_->has_stream_info)
1347                                 decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate;
1348                         else
1349                                 is_unparseable = true;
1350                         break;
1351                 case 1:
1352                 case 2:
1353                 case 3:
1354                         is_unparseable = true;
1355                         break;
1356                 case 4:
1357                         decoder->private_->frame.header.sample_rate = 8000;
1358                         break;
1359                 case 5:
1360                         decoder->private_->frame.header.sample_rate = 16000;
1361                         break;
1362                 case 6:
1363                         decoder->private_->frame.header.sample_rate = 22050;
1364                         break;
1365                 case 7:
1366                         decoder->private_->frame.header.sample_rate = 24000;
1367                         break;
1368                 case 8:
1369                         decoder->private_->frame.header.sample_rate = 32000;
1370                         break;
1371                 case 9:
1372                         decoder->private_->frame.header.sample_rate = 44100;
1373                         break;
1374                 case 10:
1375                         decoder->private_->frame.header.sample_rate = 48000;
1376                         break;
1377                 case 11:
1378                         decoder->private_->frame.header.sample_rate = 96000;
1379                         break;
1380                 case 12:
1381                 case 13:
1382                 case 14:
1383                         sample_rate_hint = x;
1384                         break;
1385                 case 15:
1386                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1387                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1388                         return true;
1389                 default:
1390                         FLAC__ASSERT(0);
1391         }
1392
1393         x = (unsigned)(raw_header[3] >> 4);
1394         if(x & 8) {
1395                 decoder->private_->frame.header.channels = 2;
1396                 switch(x & 7) {
1397                         case 0:
1398                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE;
1399                                 break;
1400                         case 1:
1401                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE;
1402                                 break;
1403                         case 2:
1404                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE;
1405                                 break;
1406                         default:
1407                                 is_unparseable = true;
1408                                 break;
1409                 }
1410         }
1411         else {
1412                 decoder->private_->frame.header.channels = (unsigned)x + 1;
1413                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT;
1414         }
1415
1416         switch(x = (unsigned)(raw_header[3] & 0x0e) >> 1) {
1417                 case 0:
1418                         if(decoder->private_->has_stream_info)
1419                                 decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample;
1420                         else
1421                                 is_unparseable = true;
1422                         break;
1423                 case 1:
1424                         decoder->private_->frame.header.bits_per_sample = 8;
1425                         break;
1426                 case 2:
1427                         decoder->private_->frame.header.bits_per_sample = 12;
1428                         break;
1429                 case 4:
1430                         decoder->private_->frame.header.bits_per_sample = 16;
1431                         break;
1432                 case 5:
1433                         decoder->private_->frame.header.bits_per_sample = 20;
1434                         break;
1435                 case 6:
1436                         decoder->private_->frame.header.bits_per_sample = 24;
1437                         break;
1438                 case 3:
1439                 case 7:
1440                         is_unparseable = true;
1441                         break;
1442                 default:
1443                         FLAC__ASSERT(0);
1444                         break;
1445         }
1446
1447         if(raw_header[3] & 0x01) { /* this should be a zero padding bit */
1448                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1449                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1450                 return true;
1451         }
1452
1453         if(blocksize_hint && is_known_variable_blocksize_stream) {
1454                 if(!FLAC__bitbuffer_read_utf8_uint64(decoder->private_->input, &xx, read_callback_, decoder, raw_header, &raw_header_len))
1455                         return false; /* the read_callback_ sets the state for us */
1456                 if(xx == 0xffffffffffffffff) { /* i.e. non-UTF8 code... */
1457                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
1458                         decoder->private_->cached = true;
1459                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1460                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1461                         return true;
1462                 }
1463                 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
1464                 decoder->private_->frame.header.number.sample_number = xx;
1465         }
1466         else {
1467                 if(!FLAC__bitbuffer_read_utf8_uint32(decoder->private_->input, &x, read_callback_, decoder, raw_header, &raw_header_len))
1468                         return false; /* the read_callback_ sets the state for us */
1469                 if(x == 0xffffffff) { /* i.e. non-UTF8 code... */
1470                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
1471                         decoder->private_->cached = true;
1472                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1473                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1474                         return true;
1475                 }
1476                 decoder->private_->last_frame_number = x;
1477                 if(decoder->private_->has_stream_info) {
1478                         decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
1479                         decoder->private_->frame.header.number.sample_number = (FLAC__int64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__int64)x;
1480                 }
1481                 else {
1482                         is_unparseable = true;
1483                 }
1484         }
1485
1486         if(blocksize_hint) {
1487                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1488                         return false; /* the read_callback_ sets the state for us */
1489                 raw_header[raw_header_len++] = (FLAC__byte)x;
1490                 if(blocksize_hint == 7) {
1491                         FLAC__uint32 _x;
1492                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &_x, 8, read_callback_, decoder))
1493                                 return false; /* the read_callback_ sets the state for us */
1494                         raw_header[raw_header_len++] = (FLAC__byte)_x;
1495                         x = (x << 8) | _x;
1496                 }
1497                 decoder->private_->frame.header.blocksize = x+1;
1498         }
1499
1500         if(sample_rate_hint) {
1501                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1502                         return false; /* the read_callback_ sets the state for us */
1503                 raw_header[raw_header_len++] = (FLAC__byte)x;
1504                 if(sample_rate_hint != 12) {
1505                         FLAC__uint32 _x;
1506                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &_x, 8, read_callback_, decoder))
1507                                 return false; /* the read_callback_ sets the state for us */
1508                         raw_header[raw_header_len++] = (FLAC__byte)_x;
1509                         x = (x << 8) | _x;
1510                 }
1511                 if(sample_rate_hint == 12)
1512                         decoder->private_->frame.header.sample_rate = x*1000;
1513                 else if(sample_rate_hint == 13)
1514                         decoder->private_->frame.header.sample_rate = x;
1515                 else
1516                         decoder->private_->frame.header.sample_rate = x*10;
1517         }
1518
1519         /* read the CRC-8 byte */
1520         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1521                 return false; /* the read_callback_ sets the state for us */
1522         crc8 = (FLAC__byte)x;
1523
1524         if(FLAC__crc8(raw_header, raw_header_len) != crc8) {
1525                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1526                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1527                 return true;
1528         }
1529
1530         if(is_unparseable) {
1531                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1532                 return false;
1533         }
1534
1535         return true;
1536 }
1537
1538 FLAC__bool stream_decoder_read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1539 {
1540         FLAC__uint32 x;
1541         FLAC__bool wasted_bits;
1542
1543         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder)) /* MAGIC NUMBER */
1544                 return false; /* the read_callback_ sets the state for us */
1545
1546         wasted_bits = (x & 1);
1547         x &= 0xfe;
1548
1549         if(wasted_bits) {
1550                 unsigned u;
1551                 if(!FLAC__bitbuffer_read_unary_unsigned(decoder->private_->input, &u, read_callback_, decoder))
1552                         return false; /* the read_callback_ sets the state for us */
1553                 decoder->private_->frame.subframes[channel].wasted_bits = u+1;
1554                 bps -= decoder->private_->frame.subframes[channel].wasted_bits;
1555         }
1556         else
1557                 decoder->private_->frame.subframes[channel].wasted_bits = 0;
1558
1559         /*
1560          * Lots of magic numbers here
1561          */
1562         if(x & 0x80) {
1563                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1564                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1565                 return true;
1566         }
1567         else if(x == 0) {
1568                 if(!stream_decoder_read_subframe_constant_(decoder, channel, bps))
1569                         return false;
1570         }
1571         else if(x == 2) {
1572                 if(!stream_decoder_read_subframe_verbatim_(decoder, channel, bps))
1573                         return false;
1574         }
1575         else if(x < 16) {
1576                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1577                 return false;
1578         }
1579         else if(x <= 24) {
1580                 if(!stream_decoder_read_subframe_fixed_(decoder, channel, bps, (x>>1)&7))
1581                         return false;
1582         }
1583         else if(x < 64) {
1584                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1585                 return false;
1586         }
1587         else {
1588                 if(!stream_decoder_read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1))
1589                         return false;
1590         }
1591
1592         if(wasted_bits) {
1593                 unsigned i;
1594                 x = decoder->private_->frame.subframes[channel].wasted_bits;
1595                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1596                         decoder->private_->output[channel][i] <<= x;
1597         }
1598
1599         return true;
1600 }
1601
1602 FLAC__bool stream_decoder_read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1603 {
1604         FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant;
1605         FLAC__int32 x;
1606         unsigned i;
1607         FLAC__int32 *output = decoder->private_->output[channel];
1608
1609         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT;
1610
1611         if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &x, bps, read_callback_, decoder))
1612                 return false; /* the read_callback_ sets the state for us */
1613
1614         subframe->value = x;
1615
1616         /* decode the subframe */
1617         for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1618                 output[i] = x;
1619
1620         return true;
1621 }
1622
1623 FLAC__bool stream_decoder_read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order)
1624 {
1625         FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed;
1626         FLAC__int32 i32;
1627         FLAC__uint32 u32;
1628         unsigned u;
1629
1630         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED;
1631
1632         subframe->residual = decoder->private_->residual[channel];
1633         subframe->order = order;
1634
1635         /* read warm-up samples */
1636         for(u = 0; u < order; u++) {
1637                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, bps, read_callback_, decoder))
1638                         return false; /* the read_callback_ sets the state for us */
1639                 subframe->warmup[u] = i32;
1640         }
1641
1642         /* read entropy coding method info */
1643         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder))
1644                 return false; /* the read_callback_ sets the state for us */
1645         subframe->entropy_coding_method.type = u32;
1646         switch(subframe->entropy_coding_method.type) {
1647                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1648                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder))
1649                                 return false; /* the read_callback_ sets the state for us */
1650                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
1651                         break;
1652                 default:
1653                         decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1654                         return false;
1655         }
1656
1657         /* read residual */
1658         switch(subframe->entropy_coding_method.type) {
1659                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1660                         if(!stream_decoder_read_residual_partitioned_rice_(decoder, order, &subframe->entropy_coding_method.data.partitioned_rice, decoder->private_->residual[channel]))
1661                                 return false;
1662                         break;
1663                 default:
1664                         FLAC__ASSERT(0);
1665         }
1666
1667         /* decode the subframe */
1668         memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
1669         FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order);
1670
1671         return true;
1672 }
1673
1674 FLAC__bool stream_decoder_read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order)
1675 {
1676         FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc;
1677         FLAC__int32 i32;
1678         FLAC__uint32 u32;
1679         unsigned u;
1680
1681         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC;
1682
1683         subframe->residual = decoder->private_->residual[channel];
1684         subframe->order = order;
1685
1686         /* read warm-up samples */
1687         for(u = 0; u < order; u++) {
1688                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, bps, read_callback_, decoder))
1689                         return false; /* the read_callback_ sets the state for us */
1690                 subframe->warmup[u] = i32;
1691         }
1692
1693         /* read qlp coeff precision */
1694         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN, read_callback_, decoder))
1695                 return false; /* the read_callback_ sets the state for us */
1696         if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) {
1697                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1698                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1699                 return true;
1700         }
1701         subframe->qlp_coeff_precision = u32+1;
1702
1703         /* read qlp shift */
1704         if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN, read_callback_, decoder))
1705                 return false; /* the read_callback_ sets the state for us */
1706         subframe->quantization_level = i32;
1707
1708         /* read quantized lp coefficiencts */
1709         for(u = 0; u < order; u++) {
1710                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision, read_callback_, decoder))
1711                         return false; /* the read_callback_ sets the state for us */
1712                 subframe->qlp_coeff[u] = i32;
1713         }
1714
1715         /* read entropy coding method info */
1716         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder))
1717                 return false; /* the read_callback_ sets the state for us */
1718         subframe->entropy_coding_method.type = u32;
1719         switch(subframe->entropy_coding_method.type) {
1720                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1721                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder))
1722                                 return false; /* the read_callback_ sets the state for us */
1723                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
1724                         break;
1725                 default:
1726                         decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1727                         return false;
1728         }
1729
1730         /* read residual */
1731         switch(subframe->entropy_coding_method.type) {
1732                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1733                         if(!stream_decoder_read_residual_partitioned_rice_(decoder, order, &subframe->entropy_coding_method.data.partitioned_rice, decoder->private_->residual[channel]))
1734                                 return false;
1735                         break;
1736                 default:
1737                         FLAC__ASSERT(0);
1738         }
1739
1740         /* decode the subframe */
1741         memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
1742         if(bps <= 16 && subframe->qlp_coeff_precision <= 16)
1743                 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);
1744         else
1745                 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);
1746
1747         return true;
1748 }
1749
1750 FLAC__bool stream_decoder_read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1751 {
1752         FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim;
1753         FLAC__int32 x, *residual = decoder->private_->residual[channel];
1754         unsigned i;
1755
1756         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM;
1757
1758         subframe->data = residual;
1759
1760         for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
1761                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &x, bps, read_callback_, decoder))
1762                         return false; /* the read_callback_ sets the state for us */
1763                 residual[i] = x;
1764         }
1765
1766         /* decode the subframe */
1767         memcpy(decoder->private_->output[channel], subframe->data, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
1768
1769         return true;
1770 }
1771
1772 FLAC__bool stream_decoder_read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, FLAC__EntropyCodingMethod_PartitionedRice *partitioned_rice, FLAC__int32 *residual)
1773 {
1774         FLAC__uint32 rice_parameter;
1775         int i;
1776         unsigned partition, sample, u;
1777         const unsigned partition_order = partitioned_rice->order;
1778         const unsigned partitions = 1u << partition_order;
1779         const unsigned partition_samples = partition_order > 0? decoder->private_->frame.header.blocksize >> partition_order : decoder->private_->frame.header.blocksize - predictor_order;
1780
1781         sample = 0;
1782         for(partition = 0; partition < partitions; partition++) {
1783                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN, read_callback_, decoder))
1784                         return false; /* the read_callback_ sets the state for us */
1785                 partitioned_rice->parameters[partition] = rice_parameter;
1786                 if(rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1787 #ifdef FLAC__SYMMETRIC_RICE
1788                         for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
1789                                 if(!FLAC__bitbuffer_read_symmetric_rice_signed(decoder->private_->input, &i, rice_parameter, read_callback_, decoder))
1790                                         return false; /* the read_callback_ sets the state for us */
1791                                 residual[sample] = i;
1792                         }
1793 #else
1794                         u = (partition_order == 0 || partition > 0)? partition_samples : partition_samples - predictor_order;
1795                         if(!FLAC__bitbuffer_read_rice_signed_block(decoder->private_->input, residual + sample, u, rice_parameter, read_callback_, decoder))
1796                                 return false; /* the read_callback_ sets the state for us */
1797                         sample += u;
1798 #endif
1799                 }
1800                 else {
1801                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN, read_callback_, decoder))
1802                                 return false; /* the read_callback_ sets the state for us */
1803                         partitioned_rice->raw_bits[partition] = rice_parameter;
1804                         for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
1805                                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i, rice_parameter, read_callback_, decoder))
1806                                         return false; /* the read_callback_ sets the state for us */
1807                                 residual[sample] = i;
1808                         }
1809                 }
1810         }
1811
1812         return true;
1813 }
1814
1815 FLAC__bool stream_decoder_read_zero_padding_(FLAC__StreamDecoder *decoder)
1816 {
1817         if(!FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input)) {
1818                 FLAC__uint32 zero = 0;
1819                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &zero, FLAC__bitbuffer_bits_left_for_byte_alignment(decoder->private_->input), read_callback_, decoder))
1820                         return false; /* the read_callback_ sets the state for us */
1821                 if(zero != 0) {
1822                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1823                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1824                 }
1825         }
1826         return true;
1827 }
1828
1829 FLAC__bool read_callback_(FLAC__byte buffer[], unsigned *bytes, void *client_data)
1830 {
1831         FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data;
1832         FLAC__StreamDecoderReadStatus status;
1833
1834         status = decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data);
1835         if(status == FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM)
1836                 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1837         else if(status == FLAC__STREAM_DECODER_READ_STATUS_ABORT)
1838                 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
1839         return status == FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
1840 }