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         FLAC__ASSERT(id != 0);
 371         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 372                 return false;
 373
 374         if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
 375                 return true;
 376
 377         FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
 378
 379         if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
 380                 if(0 == (decoder->private_->metadata_filter_ids = realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2)))
 381                         return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 382                 decoder->private_->metadata_filter_ids_capacity *= 2;
 383         }
 384
 385         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));
 386         decoder->private_->metadata_filter_ids_count++;
 387
 388         return true;
 389 }
 390
 391 FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder)
 392 {
 393         unsigned i;
 394         FLAC__ASSERT(decoder != 0);
 395         FLAC__ASSERT(decoder->private_ != 0);
 396         FLAC__ASSERT(decoder->protected_ != 0);
 397         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 398                 return false;
 399         for(i = 0; i < sizeof(decoder->private_->metadata_filter) / sizeof(decoder->private_->metadata_filter[0]); i++)
 400                 decoder->private_->metadata_filter[i] = true;
 401         decoder->private_->metadata_filter_ids_count = 0;
 402         return true;
 403 }
 404
 405 FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
 406 {
 407         FLAC__ASSERT(decoder != 0);
 408         FLAC__ASSERT(decoder->private_ != 0);
 409         FLAC__ASSERT(decoder->protected_ != 0);
 410         FLAC__ASSERT(type <= FLAC__METADATA_TYPE_VORBIS_COMMENT);
 411         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 412                 return false;
 413         decoder->private_->metadata_filter[type] = false;
 414         if(type == FLAC__METADATA_TYPE_APPLICATION)
 415                 decoder->private_->metadata_filter_ids_count = 0;
 416         return true;
 417 }
 418
 419 FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
 420 {
 421         FLAC__ASSERT(decoder != 0);
 422         FLAC__ASSERT(decoder->private_ != 0);
 423         FLAC__ASSERT(decoder->protected_ != 0);
 424         FLAC__ASSERT(id != 0);
 425         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 426                 return false;
 427
 428         if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
 429                 return true;
 430
 431         FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
 432
 433         if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
 434                 if(0 == (decoder->private_->metadata_filter_ids = realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2)))
 435                         return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 436                 decoder->private_->metadata_filter_ids_capacity *= 2;
 437         }
 438
 439         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));
 440         decoder->private_->metadata_filter_ids_count++;
 441
 442         return true;
 443 }
 444
 445 FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder)
 446 {
 447         FLAC__ASSERT(decoder != 0);
 448         FLAC__ASSERT(decoder->private_ != 0);
 449         FLAC__ASSERT(decoder->protected_ != 0);
 450         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 451                 return false;
 452         memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
 453         decoder->private_->metadata_filter_ids_count = 0;
 454         return true;
 455 }
 456
 457 FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder)
 458 {
 459         FLAC__ASSERT(decoder != 0);
 460         FLAC__ASSERT(decoder->protected_ != 0);
 461         return decoder->protected_->state;
 462 }
 463
 464 unsigned FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder)
 465 {
 466         FLAC__ASSERT(decoder != 0);
 467         FLAC__ASSERT(decoder->protected_ != 0);
 468         return decoder->protected_->channels;
 469 }
 470
 471 FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder)
 472 {
 473         FLAC__ASSERT(decoder != 0);
 474         FLAC__ASSERT(decoder->protected_ != 0);
 475         return decoder->protected_->channel_assignment;
 476 }
 477
 478 unsigned FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder)
 479 {
 480         FLAC__ASSERT(decoder != 0);
 481         FLAC__ASSERT(decoder->protected_ != 0);
 482         return decoder->protected_->bits_per_sample;
 483 }
 484
 485 unsigned FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder)
 486 {
 487         FLAC__ASSERT(decoder != 0);
 488         FLAC__ASSERT(decoder->protected_ != 0);
 489         return decoder->protected_->sample_rate;
 490 }
 491
 492 unsigned FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder)
 493 {
 494         FLAC__ASSERT(decoder != 0);
 495         FLAC__ASSERT(decoder->protected_ != 0);
 496         return decoder->protected_->blocksize;
 497 }
 498
 499 FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder)
 500 {
 501         FLAC__ASSERT(decoder != 0);
 502         FLAC__ASSERT(decoder->private_ != 0);
 503         FLAC__ASSERT(decoder->protected_ != 0);
 504
 505         if(!FLAC__bitbuffer_clear(decoder->private_->input)) {
 506                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 507                 return false;
 508         }
 509         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 510
 511         return true;
 512 }
 513
 514 FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder)
 515 {
 516         FLAC__ASSERT(decoder != 0);
 517         FLAC__ASSERT(decoder->private_ != 0);
 518         FLAC__ASSERT(decoder->protected_ != 0);
 519
 520         if(!FLAC__stream_decoder_flush(decoder)) {
 521                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 522                 return false;
 523         }
 524         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
 525
 526         decoder->private_->samples_decoded = 0;
 527
 528         return true;
 529 }
 530
 531 FLAC__bool FLAC__stream_decoder_process_whole_stream(FLAC__StreamDecoder *decoder)
 532 {
 533         FLAC__bool dummy;
 534         FLAC__ASSERT(decoder != 0);
 535
 536         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 537                 return true;
 538
 539         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA);
 540
 541         if(!FLAC__stream_decoder_reset(decoder)) {
 542                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 543                 return false;
 544         }
 545
 546         while(1) {
 547                 switch(decoder->protected_->state) {
 548                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
 549                                 if(!stream_decoder_find_metadata_(decoder))
 550                                         return false; /* above function sets the status for us */
 551                                 break;
 552                         case FLAC__STREAM_DECODER_READ_METADATA:
 553                                 if(!stream_decoder_read_metadata_(decoder))
 554                                         return false; /* above function sets the status for us */
 555                                 break;
 556                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 557                                 if(!stream_decoder_frame_sync_(decoder))
 558                                         return true; /* above function sets the status for us */
 559                                 break;
 560                         case FLAC__STREAM_DECODER_READ_FRAME:
 561                                 if(!stream_decoder_read_frame_(decoder, &dummy))
 562                                         return false; /* above function sets the status for us */
 563                                 break;
 564                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 565                         case FLAC__STREAM_DECODER_ABORTED:
 566                                 return true;
 567                         default:
 568                                 FLAC__ASSERT(0);
 569                 }
 570         }
 571 }
 572
 573 FLAC__bool FLAC__stream_decoder_process_metadata(FLAC__StreamDecoder *decoder)
 574 {
 575         FLAC__ASSERT(decoder != 0);
 576
 577         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 578                 return true;
 579
 580         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA);
 581
 582         if(!FLAC__stream_decoder_reset(decoder)) {
 583                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 584                 return false;
 585         }
 586
 587         while(1) {
 588                 switch(decoder->protected_->state) {
 589                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
 590                                 if(!stream_decoder_find_metadata_(decoder))
 591                                         return false; /* above function sets the status for us */
 592                                 break;
 593                         case FLAC__STREAM_DECODER_READ_METADATA:
 594                                 if(!stream_decoder_read_metadata_(decoder))
 595                                         return false; /* above function sets the status for us */
 596                                 break;
 597                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 598                         case FLAC__STREAM_DECODER_READ_FRAME:
 599                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 600                         case FLAC__STREAM_DECODER_ABORTED:
 601                                 return true;
 602                         default:
 603                                 FLAC__ASSERT(0);
 604                 }
 605         }
 606 }
 607
 608 FLAC__bool FLAC__stream_decoder_process_one_frame(FLAC__StreamDecoder *decoder)
 609 {
 610         FLAC__bool got_a_frame;
 611         FLAC__ASSERT(decoder != 0);
 612
 613         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 614                 return true;
 615
 616         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC);
 617
 618         while(1) {
 619                 switch(decoder->protected_->state) {
 620                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 621                                 if(!stream_decoder_frame_sync_(decoder))
 622                                         return true; /* above function sets the status for us */
 623                                 break;
 624                         case FLAC__STREAM_DECODER_READ_FRAME:
 625                                 if(!stream_decoder_read_frame_(decoder, &got_a_frame))
 626                                         return false; /* above function sets the status for us */
 627                                 if(got_a_frame)
 628                                         return true; /* above function sets the status for us */
 629                                 break;
 630                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 631                         case FLAC__STREAM_DECODER_ABORTED:
 632                                 return true;
 633                         default:
 634                                 FLAC__ASSERT(0);
 635                 }
 636         }
 637 }
 638
 639 FLAC__bool FLAC__stream_decoder_process_remaining_frames(FLAC__StreamDecoder *decoder)
 640 {
 641         FLAC__bool dummy;
 642         FLAC__ASSERT(decoder != 0);
 643
 644         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 645                 return true;
 646
 647         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC);
 648
 649         while(1) {
 650                 switch(decoder->protected_->state) {
 651                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 652                                 if(!stream_decoder_frame_sync_(decoder))
 653                                         return true; /* above function sets the status for us */
 654                                 break;
 655                         case FLAC__STREAM_DECODER_READ_FRAME:
 656                                 if(!stream_decoder_read_frame_(decoder, &dummy))
 657                                         return false; /* above function sets the status for us */
 658                                 break;
 659                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 660                         case FLAC__STREAM_DECODER_ABORTED:
 661                                 return true;
 662                         default:
 663                                 FLAC__ASSERT(0);
 664                 }
 665         }
 666 }
 667
 668 /***********************************************************************
 669  *
 670  * Protected class methods
 671  *
 672  ***********************************************************************/
 673
 674 unsigned FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder)
 675 {
 676         FLAC__ASSERT(decoder != 0);
 677         return FLAC__bitbuffer_get_input_bytes_unconsumed(decoder->private_->input);
 678 }
 679
 680 /***********************************************************************
 681  *
 682  * Private class methods
 683  *
 684  ***********************************************************************/
 685
 686 void stream_decoder_set_defaults_(FLAC__StreamDecoder *decoder)
 687 {
 688         decoder->private_->read_callback = 0;
 689         decoder->private_->write_callback = 0;
 690         decoder->private_->metadata_callback = 0;
 691         decoder->private_->error_callback = 0;
 692         decoder->private_->client_data = 0;
 693
 694         memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
 695         decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] = true;
 696         decoder->private_->metadata_filter_ids_count = 0;
 697 }
 698
 699 FLAC__bool stream_decoder_allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels)
 700 {
 701         unsigned i;
 702         FLAC__int32 *tmp;
 703
 704         if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels)
 705                 return true;
 706
 707         /* @@@ should change to use realloc() */
 708
 709         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 710                 if(decoder->private_->output[i] != 0) {
 711                         free(decoder->private_->output[i]);
 712                         decoder->private_->output[i] = 0;
 713                 }
 714                 if(decoder->private_->residual[i] != 0) {
 715                         free(decoder->private_->residual[i]);
 716                         decoder->private_->residual[i] = 0;
 717                 }
 718         }
 719
 720         for(i = 0; i < channels; i++) {
 721                 /* 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. */
 722                 tmp = (FLAC__int32*)malloc(sizeof(FLAC__int32)*(size+4));
 723                 if(tmp == 0) {
 724                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 725                         return false;
 726                 }
 727                 memset(tmp, 0, sizeof(FLAC__int32)*4);
 728                 decoder->private_->output[i] = tmp + 4;
 729
 730                 tmp = (FLAC__int32*)malloc(sizeof(FLAC__int32)*size);
 731                 if(tmp == 0) {
 732                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 733                         return false;
 734                 }
 735                 decoder->private_->residual[i] = tmp;
 736         }
 737
 738         decoder->private_->output_capacity = size;
 739         decoder->private_->output_channels = channels;
 740
 741         return true;
 742 }
 743
 744 FLAC__bool stream_decoder_has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id)
 745 {
 746         unsigned i;
 747
 748         FLAC__ASSERT(0 != decoder);
 749         FLAC__ASSERT(0 != decoder->private_);
 750
 751         for(i = 0; i < decoder->private_->metadata_filter_ids_count; i++)
 752                 if(0 == memcmp(decoder->private_->metadata_filter_ids + i * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)))
 753                         return true;
 754
 755         return false;
 756 }
 757
 758 FLAC__bool stream_decoder_find_metadata_(FLAC__StreamDecoder *decoder)
 759 {
 760         FLAC__uint32 x;
 761         unsigned i, id;
 762         FLAC__bool first = true;
 763
 764         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
 765
 766         for(i = id = 0; i < 4; ) {
 767                 if(decoder->private_->cached) {
 768                         x = (FLAC__uint32)decoder->private_->lookahead;
 769                         decoder->private_->cached = false;
 770                 }
 771                 else {
 772                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
 773                                 return false; /* the read_callback_ sets the state for us */
 774                 }
 775                 if(x == FLAC__STREAM_SYNC_STRING[i]) {
 776                         first = true;
 777                         i++;
 778                         id = 0;
 779                         continue;
 780                 }
 781                 if(x == ID3V2_TAG_[id]) {
 782                         id++;
 783                         i = 0;
 784                         if(id == 3) {
 785                                 if(!stream_decoder_skip_id3v2_tag_(decoder))
 786                                         return false; /* the read_callback_ sets the state for us */
 787                         }
 788                         continue;
 789                 }
 790                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 791                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
 792                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
 793                                 return false; /* the read_callback_ sets the state for us */
 794
 795                         /* 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 */
 796                         /* else we have to check if the second byte is the end of a sync code */
 797                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 798                                 decoder->private_->lookahead = (FLAC__byte)x;
 799                                 decoder->private_->cached = true;
 800                         }
 801                         else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
 802                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
 803                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
 804                                 return true;
 805                         }
 806                 }
 807                 i = 0;
 808                 if(first) {
 809                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
 810                         first = false;
 811                 }
 812         }
 813
 814         decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA;
 815         return true;
 816 }
 817
 818 FLAC__bool stream_decoder_read_metadata_(FLAC__StreamDecoder *decoder)
 819 {
 820         FLAC__uint32 i, x, last_block, type, length;
 821         FLAC__uint64 xx;
 822
 823         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
 824
 825         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &last_block, FLAC__STREAM_METADATA_IS_LAST_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, &type, FLAC__STREAM_METADATA_TYPE_LEN, read_callback_, decoder))
 828                 return false; /* the read_callback_ sets the state for us */
 829         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN, read_callback_, decoder))
 830                 return false; /* the read_callback_ sets the state for us */
 831         if(type == FLAC__METADATA_TYPE_STREAMINFO) {
 832                 unsigned used_bits = 0;
 833                 decoder->private_->stream_info.type = type;
 834                 decoder->private_->stream_info.is_last = last_block;
 835                 decoder->private_->stream_info.length = length;
 836
 837                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN, read_callback_, decoder))
 838                         return false; /* the read_callback_ sets the state for us */
 839                 decoder->private_->stream_info.data.stream_info.min_blocksize = x;
 840                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN;
 841
 842                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN, read_callback_, decoder))
 843                         return false; /* the read_callback_ sets the state for us */
 844                 decoder->private_->stream_info.data.stream_info.max_blocksize = x;
 845                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN;
 846
 847                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN, read_callback_, decoder))
 848                         return false; /* the read_callback_ sets the state for us */
 849                 decoder->private_->stream_info.data.stream_info.min_framesize = x;
 850                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN;
 851
 852                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN, read_callback_, decoder))
 853                         return false; /* the read_callback_ sets the state for us */
 854                 decoder->private_->stream_info.data.stream_info.max_framesize = x;
 855                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN;
 856
 857                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN, read_callback_, decoder))
 858                         return false; /* the read_callback_ sets the state for us */
 859                 decoder->private_->stream_info.data.stream_info.sample_rate = x;
 860                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN;
 861
 862                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN, read_callback_, decoder))
 863                         return false; /* the read_callback_ sets the state for us */
 864                 decoder->private_->stream_info.data.stream_info.channels = x+1;
 865                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN;
 866
 867                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN, read_callback_, decoder))
 868                         return false; /* the read_callback_ sets the state for us */
 869                 decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1;
 870                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN;
 871
 872                 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))
 873                         return false; /* the read_callback_ sets the state for us */
 874                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN;
 875
 876                 if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, decoder->private_->stream_info.data.stream_info.md5sum, 16, read_callback_, decoder))
 877                         return false; /* the read_callback_ sets the state for us */
 878                 used_bits += 16*8;
 879
 880                 /* skip the rest of the block */
 881                 FLAC__ASSERT(used_bits % 8 == 0);
 882                 length -= (used_bits / 8);
 883                 if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, length, read_callback_, decoder))
 884                         return false; /* the read_callback_ sets the state for us */
 885
 886                 decoder->private_->has_stream_info = true;
 887                 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO])
 888                         decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data);
 889         }
 890         else if(type == FLAC__METADATA_TYPE_SEEKTABLE) {
 891                 decoder->private_->seek_table.type = type;
 892                 decoder->private_->seek_table.is_last = last_block;
 893                 decoder->private_->seek_table.length = length;
 894
 895                 decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
 896
 897                 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)))) {
 898                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 899                         return false;
 900                 }
 901                 for(i = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) {
 902                         if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN, read_callback_, decoder))
 903                                 return false; /* the read_callback_ sets the state for us */
 904                         decoder->private_->seek_table.data.seek_table.points[i].sample_number = xx;
 905
 906                         if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN, read_callback_, decoder))
 907                                 return false; /* the read_callback_ sets the state for us */
 908                         decoder->private_->seek_table.data.seek_table.points[i].stream_offset = xx;
 909
 910                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN, read_callback_, decoder))
 911                                 return false; /* the read_callback_ sets the state for us */
 912                         decoder->private_->seek_table.data.seek_table.points[i].frame_samples = x;
 913                 }
 914                 length -= (decoder->private_->seek_table.data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH);
 915                 /* if there is a partial point left, skip over it */
 916                 if(length > 0) {
 917                         /*@@@ do an error_callback() here?  there's an argument for either way */
 918                         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, length, read_callback_, decoder))
 919                                 return false; /* the read_callback_ sets the state for us */
 920                 }
 921
 922                 decoder->private_->has_seek_table = true;
 923                 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_SEEKTABLE])
 924                         decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data);
 925         }
 926         else {
 927                 FLAC__bool skip_it = !decoder->private_->metadata_filter[type];
 928                 unsigned real_length = length;
 929                 FLAC__StreamMetadata block;
 930
 931                 block.is_last = last_block;
 932                 block.type = type;
 933                 block.length = length;
 934
 935                 if(type == FLAC__METADATA_TYPE_APPLICATION) {
 936                         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, block.data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8, read_callback_, decoder))
 937                                 return false; /* the read_callback_ sets the state for us */
 938
 939                         real_length -= FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8;
 940
 941                         if(decoder->private_->metadata_filter_ids_count > 0 && stream_decoder_has_id_filtered_(decoder, block.data.application.id))
 942                                 skip_it = !skip_it;
 943                 }
 944
 945                 if(skip_it) {
 946                         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, real_length, read_callback_, decoder))
 947                                 return false; /* the read_callback_ sets the state for us */
 948                 }
 949                 else {
 950                         switch(type) {
 951                                 case FLAC__METADATA_TYPE_PADDING:
 952                                         /* skip the padding bytes */
 953                                         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, real_length, read_callback_, decoder))
 954                                                 return false; /* the read_callback_ sets the state for us */
 955                                         break;
 956                                 case FLAC__METADATA_TYPE_APPLICATION:
 957                                         /* remember, we read the ID already */
 958                                         if(real_length > 0) {
 959                                                 if(0 == (block.data.application.data = malloc(real_length))) {
 960                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 961                                                         return false;
 962                                                 }
 963                                                 if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, block.data.application.data, real_length, read_callback_, decoder))
 964                                                         return false; /* the read_callback_ sets the state for us */
 965                                         }
 966                                         else
 967                                                 block.data.application.data = 0;
 968                                         break;
 969                                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 970                                         /* read vendor string */
 971                                         FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
 972                                         if(!FLAC__bitbuffer_read_raw_uint32_little_endian(decoder->private_->input, &block.data.vorbis_comment.vendor_string.length, read_callback_, decoder))
 973                                                 return false; /* the read_callback_ sets the state for us */
 974                                         if(block.data.vorbis_comment.vendor_string.length > 0) {
 975                                                 if(0 == (block.data.vorbis_comment.vendor_string.entry = malloc(block.data.vorbis_comment.vendor_string.length))) {
 976                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 977                                                         return false;
 978                                                 }
 979                                                 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))
 980                                                         return false; /* the read_callback_ sets the state for us */
 981                                         }
 982                                         else
 983                                                 block.data.vorbis_comment.vendor_string.entry = 0;
 984
 985                                         /* read num comments */
 986                                         FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN == 32);
 987                                         if(!FLAC__bitbuffer_read_raw_uint32_little_endian(decoder->private_->input, &block.data.vorbis_comment.num_comments, read_callback_, decoder))
 988                                                 return false; /* the read_callback_ sets the state for us */
 989
 990                                         /* read comments */
 991                                         if(block.data.vorbis_comment.num_comments > 0) {
 992                                                 if(0 == (block.data.vorbis_comment.comments = malloc(block.data.vorbis_comment.num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) {
 993                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 994                                                         return false;
 995                                                 }
 996                                                 for(i = 0; i < block.data.vorbis_comment.num_comments; i++) {
 997                                                         FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
 998                                                         if(!FLAC__bitbuffer_read_raw_uint32_little_endian(decoder->private_->input, &block.data.vorbis_comment.comments[i].length, read_callback_, decoder))
 999                                                                 return false; /* the read_callback_ sets the state for us */
1000                                                         if(block.data.vorbis_comment.comments[i].length > 0) {
1001                                                                 if(0 == (block.data.vorbis_comment.comments[i].entry = malloc(block.data.vorbis_comment.comments[i].length))) {
1002                                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1003                                                                         return false;
1004                                                                 }
1005                                                                 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))
1006                                                                         return false; /* the read_callback_ sets the state for us */
1007                                                         }
1008                                                         else
1009                                                                 block.data.vorbis_comment.comments[i].entry = 0;
1010                                                 }
1011                                         }
1012                                         else {
1013                                                 block.data.vorbis_comment.comments = 0;
1014                                         }
1015                                         break;
1016                                 case FLAC__METADATA_TYPE_STREAMINFO:
1017                                 case FLAC__METADATA_TYPE_SEEKTABLE:
1018                                 default:
1019                                         FLAC__ASSERT(0);
1020                         }
1021                         decoder->private_->metadata_callback(decoder, &block, decoder->private_->client_data);
1022
1023                         /* now we have to free any malloc'ed data in the block */
1024                         switch(type) {
1025                                 case FLAC__METADATA_TYPE_PADDING:
1026                                         break;
1027                                 case FLAC__METADATA_TYPE_APPLICATION:
1028                                         if(0 != block.data.application.data)
1029                                                 free(block.data.application.data);
1030                                         break;
1031                                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1032                                         if(0 != block.data.vorbis_comment.vendor_string.entry)
1033                                                 free(block.data.vorbis_comment.vendor_string.entry);
1034                                         if(block.data.vorbis_comment.num_comments > 0)
1035                                                 for(i = 0; i < block.data.vorbis_comment.num_comments; i++)
1036                                                         if(0 != block.data.vorbis_comment.comments[i].entry)
1037                                                                 free(block.data.vorbis_comment.comments[i].entry);
1038                                         if(0 != block.data.vorbis_comment.comments)
1039                                                 free(block.data.vorbis_comment.comments);
1040                                         break;
1041                                 case FLAC__METADATA_TYPE_STREAMINFO:
1042                                 case FLAC__METADATA_TYPE_SEEKTABLE:
1043                                 default:
1044                                         FLAC__ASSERT(0);
1045                         }
1046                 }
1047         }
1048
1049         if(last_block)
1050                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1051
1052         return true;
1053 }
1054
1055 FLAC__bool stream_decoder_skip_id3v2_tag_(FLAC__StreamDecoder *decoder)
1056 {
1057         FLAC__uint32 x;
1058         unsigned i, skip;
1059
1060         /* skip the version and flags bytes */
1061         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 24, read_callback_, decoder))
1062                 return false; /* the read_callback_ sets the state for us */
1063         /* get the size (in bytes) to skip */
1064         skip = 0;
1065         for(i = 0; i < 4; i++) {
1066                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1067                         return false; /* the read_callback_ sets the state for us */
1068                 skip <<= 7;
1069                 skip |= (x & 0x7f);
1070         }
1071         /* skip the rest of the tag */
1072         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, skip, read_callback_, decoder))
1073                 return false; /* the read_callback_ sets the state for us */
1074         return true;
1075 }
1076
1077 FLAC__bool stream_decoder_frame_sync_(FLAC__StreamDecoder *decoder)
1078 {
1079         FLAC__uint32 x;
1080         FLAC__bool first = true;
1081
1082         /* If we know the total number of samples in the stream, stop if we've read that many. */
1083         /* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */
1084         if(decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.total_samples) {
1085                 if(decoder->private_->samples_decoded >= decoder->private_->stream_info.data.stream_info.total_samples) {
1086                         decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1087                         return true;
1088                 }
1089         }
1090
1091         /* make sure we're byte aligned */
1092         if(!FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input)) {
1093                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__bitbuffer_bits_left_for_byte_alignment(decoder->private_->input), read_callback_, decoder))
1094                         return false; /* the read_callback_ sets the state for us */
1095         }
1096
1097         while(1) {
1098                 if(decoder->private_->cached) {
1099                         x = (FLAC__uint32)decoder->private_->lookahead;
1100                         decoder->private_->cached = false;
1101                 }
1102                 else {
1103                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1104                                 return false; /* the read_callback_ sets the state for us */
1105                 }
1106                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1107                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
1108                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1109                                 return false; /* the read_callback_ sets the state for us */
1110
1111                         /* 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 */
1112                         /* else we have to check if the second byte is the end of a sync code */
1113                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1114                                 decoder->private_->lookahead = (FLAC__byte)x;
1115                                 decoder->private_->cached = true;
1116                         }
1117                         else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
1118                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
1119                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
1120                                 return true;
1121                         }
1122                 }
1123                 if(first) {
1124                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1125                         first = false;
1126                 }
1127         }
1128
1129         return true;
1130 }
1131
1132 FLAC__bool stream_decoder_read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame)
1133 {
1134         unsigned channel;
1135         unsigned i;
1136         FLAC__int32 mid, side, left, right;
1137         FLAC__uint16 frame_crc; /* the one we calculate from the input stream */
1138         FLAC__uint32 x;
1139
1140         *got_a_frame = false;
1141
1142         /* init the CRC */
1143         frame_crc = 0;
1144         FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc);
1145         FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc);
1146         FLAC__bitbuffer_reset_read_crc16(decoder->private_->input, frame_crc);
1147
1148         if(!stream_decoder_read_frame_header_(decoder))
1149                 return false;
1150         if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC)
1151                 return true;
1152         if(!stream_decoder_allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels))
1153                 return false;
1154         for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
1155                 /*
1156                  * first figure the correct bits-per-sample of the subframe
1157                  */
1158                 unsigned bps = decoder->private_->frame.header.bits_per_sample;
1159                 switch(decoder->private_->frame.header.channel_assignment) {
1160                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1161                                 /* no adjustment needed */
1162                                 break;
1163                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1164                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1165                                 if(channel == 1)
1166                                         bps++;
1167                                 break;
1168                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1169                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1170                                 if(channel == 0)
1171                                         bps++;
1172                                 break;
1173                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1174                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1175                                 if(channel == 1)
1176                                         bps++;
1177                                 break;
1178                         default:
1179                                 FLAC__ASSERT(0);
1180                 }
1181                 /*
1182                  * now read it
1183                  */
1184                 if(!stream_decoder_read_subframe_(decoder, channel, bps))
1185                         return false;
1186                 if(decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME) {
1187                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1188                         return true;
1189                 }
1190         }
1191         if(!stream_decoder_read_zero_padding_(decoder))
1192                 return false;
1193
1194         /*
1195          * Read the frame CRC-16 from the footer and check
1196          */
1197         frame_crc = FLAC__bitbuffer_get_read_crc16(decoder->private_->input);
1198         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN, read_callback_, decoder))
1199                 return false; /* the read_callback_ sets the state for us */
1200         if(frame_crc == (FLAC__uint16)x) {
1201                 /* Undo any special channel coding */
1202                 switch(decoder->private_->frame.header.channel_assignment) {
1203                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1204                                 /* do nothing */
1205                                 break;
1206                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1207                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1208                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1209                                         decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i];
1210                                 break;
1211                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1212                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1213                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1214                                         decoder->private_->output[0][i] += decoder->private_->output[1][i];
1215                                 break;
1216                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1217                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1218                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
1219                                         mid = decoder->private_->output[0][i];
1220                                         side = decoder->private_->output[1][i];
1221                                         mid <<= 1;
1222                                         if(side & 1) /* i.e. if 'side' is odd... */
1223                                                 mid++;
1224                                         left = mid + side;
1225                                         right = mid - side;
1226                                         decoder->private_->output[0][i] = left >> 1;
1227                                         decoder->private_->output[1][i] = right >> 1;
1228                                 }
1229                                 break;
1230                         default:
1231                                 FLAC__ASSERT(0);
1232                                 break;
1233                 }
1234         }
1235         else {
1236                 /* Bad frame, emit error and zero the output signal */
1237                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH, decoder->private_->client_data);
1238                 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
1239                         memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
1240                 }
1241         }
1242
1243         *got_a_frame = true;
1244
1245         /* put the latest values into the public section of the decoder instance */
1246         decoder->protected_->channels = decoder->private_->frame.header.channels;
1247         decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment;
1248         decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample;
1249         decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate;
1250         decoder->protected_->blocksize = decoder->private_->frame.header.blocksize;
1251
1252         FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
1253         decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize;
1254
1255         /* write it */
1256         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)
1257                 return false;
1258
1259         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1260         return true;
1261 }
1262
1263 FLAC__bool stream_decoder_read_frame_header_(FLAC__StreamDecoder *decoder)
1264 {
1265         FLAC__uint32 x;
1266         FLAC__uint64 xx;
1267         unsigned i, blocksize_hint = 0, sample_rate_hint = 0;
1268         FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */
1269         unsigned raw_header_len;
1270         FLAC__bool is_unparseable = false;
1271         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);
1272         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);
1273
1274         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
1275
1276         /* init the raw header with the saved bits from synchronization */
1277         raw_header[0] = decoder->private_->header_warmup[0];
1278         raw_header[1] = decoder->private_->header_warmup[1];
1279         raw_header_len = 2;
1280
1281         /*
1282          * check to make sure that the reserved bits are 0
1283          */
1284         if(raw_header[1] & 0x03) { /* MAGIC NUMBER */
1285                 is_unparseable = true;
1286         }
1287
1288         /*
1289          * Note that along the way as we read the header, we look for a sync
1290          * code inside.  If we find one it would indicate that our original
1291          * sync was bad since there cannot be a sync code in a valid header.
1292          */
1293
1294         /*
1295          * read in the raw header as bytes so we can CRC it, and parse it on the way
1296          */
1297         for(i = 0; i < 2; i++) {
1298                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1299                         return false; /* the read_callback_ sets the state for us */
1300                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1301                         /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */
1302                         decoder->private_->lookahead = (FLAC__byte)x;
1303                         decoder->private_->cached = true;
1304                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1305                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1306                         return true;
1307                 }
1308                 raw_header[raw_header_len++] = (FLAC__byte)x;
1309         }
1310
1311         switch(x = raw_header[2] >> 4) {
1312                 case 0:
1313                         if(is_known_fixed_blocksize_stream)
1314                                 decoder->private_->frame.header.blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize;
1315                         else
1316                                 is_unparseable = true;
1317                         break;
1318                 case 1:
1319                         decoder->private_->frame.header.blocksize = 192;
1320                         break;
1321                 case 2:
1322                 case 3:
1323                 case 4:
1324                 case 5:
1325                         decoder->private_->frame.header.blocksize = 576 << (x-2);
1326                         break;
1327                 case 6:
1328                 case 7:
1329                         blocksize_hint = x;
1330                         break;
1331                 case 8:
1332                 case 9:
1333                 case 10:
1334                 case 11:
1335                 case 12:
1336                 case 13:
1337                 case 14:
1338                 case 15:
1339                         decoder->private_->frame.header.blocksize = 256 << (x-8);
1340                         break;
1341                 default:
1342                         FLAC__ASSERT(0);
1343                         break;
1344         }
1345
1346         switch(x = raw_header[2] & 0x0f) {
1347                 case 0:
1348                         if(decoder->private_->has_stream_info)
1349                                 decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate;
1350                         else
1351                                 is_unparseable = true;
1352                         break;
1353                 case 1:
1354                 case 2:
1355                 case 3:
1356                         is_unparseable = true;
1357                         break;
1358                 case 4:
1359                         decoder->private_->frame.header.sample_rate = 8000;
1360                         break;
1361                 case 5:
1362                         decoder->private_->frame.header.sample_rate = 16000;
1363                         break;
1364                 case 6:
1365                         decoder->private_->frame.header.sample_rate = 22050;
1366                         break;
1367                 case 7:
1368                         decoder->private_->frame.header.sample_rate = 24000;
1369                         break;
1370                 case 8:
1371                         decoder->private_->frame.header.sample_rate = 32000;
1372                         break;
1373                 case 9:
1374                         decoder->private_->frame.header.sample_rate = 44100;
1375                         break;
1376                 case 10:
1377                         decoder->private_->frame.header.sample_rate = 48000;
1378                         break;
1379                 case 11:
1380                         decoder->private_->frame.header.sample_rate = 96000;
1381                         break;
1382                 case 12:
1383                 case 13:
1384                 case 14:
1385                         sample_rate_hint = x;
1386                         break;
1387                 case 15:
1388                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1389                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1390                         return true;
1391                 default:
1392                         FLAC__ASSERT(0);
1393         }
1394
1395         x = (unsigned)(raw_header[3] >> 4);
1396         if(x & 8) {
1397                 decoder->private_->frame.header.channels = 2;
1398                 switch(x & 7) {
1399                         case 0:
1400                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE;
1401                                 break;
1402                         case 1:
1403                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE;
1404                                 break;
1405                         case 2:
1406                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE;
1407                                 break;
1408                         default:
1409                                 is_unparseable = true;
1410                                 break;
1411                 }
1412         }
1413         else {
1414                 decoder->private_->frame.header.channels = (unsigned)x + 1;
1415                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT;
1416         }
1417
1418         switch(x = (unsigned)(raw_header[3] & 0x0e) >> 1) {
1419                 case 0:
1420                         if(decoder->private_->has_stream_info)
1421                                 decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample;
1422                         else
1423                                 is_unparseable = true;
1424                         break;
1425                 case 1:
1426                         decoder->private_->frame.header.bits_per_sample = 8;
1427                         break;
1428                 case 2:
1429                         decoder->private_->frame.header.bits_per_sample = 12;
1430                         break;
1431                 case 4:
1432                         decoder->private_->frame.header.bits_per_sample = 16;
1433                         break;
1434                 case 5:
1435                         decoder->private_->frame.header.bits_per_sample = 20;
1436                         break;
1437                 case 6:
1438                         decoder->private_->frame.header.bits_per_sample = 24;
1439                         break;
1440                 case 3:
1441                 case 7:
1442                         is_unparseable = true;
1443                         break;
1444                 default:
1445                         FLAC__ASSERT(0);
1446                         break;
1447         }
1448
1449         if(raw_header[3] & 0x01) { /* this should be a zero padding bit */
1450                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1451                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1452                 return true;
1453         }
1454
1455         if(blocksize_hint && is_known_variable_blocksize_stream) {
1456                 if(!FLAC__bitbuffer_read_utf8_uint64(decoder->private_->input, &xx, read_callback_, decoder, raw_header, &raw_header_len))
1457                         return false; /* the read_callback_ sets the state for us */
1458                 if(xx == 0xffffffffffffffff) { /* i.e. non-UTF8 code... */
1459                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
1460                         decoder->private_->cached = true;
1461                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1462                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1463                         return true;
1464                 }
1465                 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
1466                 decoder->private_->frame.header.number.sample_number = xx;
1467         }
1468         else {
1469                 if(!FLAC__bitbuffer_read_utf8_uint32(decoder->private_->input, &x, read_callback_, decoder, raw_header, &raw_header_len))
1470                         return false; /* the read_callback_ sets the state for us */
1471                 if(x == 0xffffffff) { /* i.e. non-UTF8 code... */
1472                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
1473                         decoder->private_->cached = true;
1474                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1475                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1476                         return true;
1477                 }
1478                 decoder->private_->last_frame_number = x;
1479                 if(decoder->private_->has_stream_info) {
1480                         decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
1481                         decoder->private_->frame.header.number.sample_number = (FLAC__int64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__int64)x;
1482                 }
1483                 else {
1484                         is_unparseable = true;
1485                 }
1486         }
1487
1488         if(blocksize_hint) {
1489                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1490                         return false; /* the read_callback_ sets the state for us */
1491                 raw_header[raw_header_len++] = (FLAC__byte)x;
1492                 if(blocksize_hint == 7) {
1493                         FLAC__uint32 _x;
1494                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &_x, 8, read_callback_, decoder))
1495                                 return false; /* the read_callback_ sets the state for us */
1496                         raw_header[raw_header_len++] = (FLAC__byte)_x;
1497                         x = (x << 8) | _x;
1498                 }
1499                 decoder->private_->frame.header.blocksize = x+1;
1500         }
1501
1502         if(sample_rate_hint) {
1503                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1504                         return false; /* the read_callback_ sets the state for us */
1505                 raw_header[raw_header_len++] = (FLAC__byte)x;
1506                 if(sample_rate_hint != 12) {
1507                         FLAC__uint32 _x;
1508                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &_x, 8, read_callback_, decoder))
1509                                 return false; /* the read_callback_ sets the state for us */
1510                         raw_header[raw_header_len++] = (FLAC__byte)_x;
1511                         x = (x << 8) | _x;
1512                 }
1513                 if(sample_rate_hint == 12)
1514                         decoder->private_->frame.header.sample_rate = x*1000;
1515                 else if(sample_rate_hint == 13)
1516                         decoder->private_->frame.header.sample_rate = x;
1517                 else
1518                         decoder->private_->frame.header.sample_rate = x*10;
1519         }
1520
1521         /* read the CRC-8 byte */
1522         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1523                 return false; /* the read_callback_ sets the state for us */
1524         crc8 = (FLAC__byte)x;
1525
1526         if(FLAC__crc8(raw_header, raw_header_len) != crc8) {
1527                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1528                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1529                 return true;
1530         }
1531
1532         if(is_unparseable) {
1533                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1534                 return false;
1535         }
1536
1537         return true;
1538 }
1539
1540 FLAC__bool stream_decoder_read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1541 {
1542         FLAC__uint32 x;
1543         FLAC__bool wasted_bits;
1544
1545         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder)) /* MAGIC NUMBER */
1546                 return false; /* the read_callback_ sets the state for us */
1547
1548         wasted_bits = (x & 1);
1549         x &= 0xfe;
1550
1551         if(wasted_bits) {
1552                 unsigned u;
1553                 if(!FLAC__bitbuffer_read_unary_unsigned(decoder->private_->input, &u, read_callback_, decoder))
1554                         return false; /* the read_callback_ sets the state for us */
1555                 decoder->private_->frame.subframes[channel].wasted_bits = u+1;
1556                 bps -= decoder->private_->frame.subframes[channel].wasted_bits;
1557         }
1558         else
1559                 decoder->private_->frame.subframes[channel].wasted_bits = 0;
1560
1561         /*
1562          * Lots of magic numbers here
1563          */
1564         if(x & 0x80) {
1565                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1566                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1567                 return true;
1568         }
1569         else if(x == 0) {
1570                 if(!stream_decoder_read_subframe_constant_(decoder, channel, bps))
1571                         return false;
1572         }
1573         else if(x == 2) {
1574                 if(!stream_decoder_read_subframe_verbatim_(decoder, channel, bps))
1575                         return false;
1576         }
1577         else if(x < 16) {
1578                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1579                 return false;
1580         }
1581         else if(x <= 24) {
1582                 if(!stream_decoder_read_subframe_fixed_(decoder, channel, bps, (x>>1)&7))
1583                         return false;
1584         }
1585         else if(x < 64) {
1586                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1587                 return false;
1588         }
1589         else {
1590                 if(!stream_decoder_read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1))
1591                         return false;
1592         }
1593
1594         if(wasted_bits) {
1595                 unsigned i;
1596                 x = decoder->private_->frame.subframes[channel].wasted_bits;
1597                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1598                         decoder->private_->output[channel][i] <<= x;
1599         }
1600
1601         return true;
1602 }
1603
1604 FLAC__bool stream_decoder_read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1605 {
1606         FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant;
1607         FLAC__int32 x;
1608         unsigned i;
1609         FLAC__int32 *output = decoder->private_->output[channel];
1610
1611         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT;
1612
1613         if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &x, bps, read_callback_, decoder))
1614                 return false; /* the read_callback_ sets the state for us */
1615
1616         subframe->value = x;
1617
1618         /* decode the subframe */
1619         for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1620                 output[i] = x;
1621
1622         return true;
1623 }
1624
1625 FLAC__bool stream_decoder_read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order)
1626 {
1627         FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed;
1628         FLAC__int32 i32;
1629         FLAC__uint32 u32;
1630         unsigned u;
1631
1632         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED;
1633
1634         subframe->residual = decoder->private_->residual[channel];
1635         subframe->order = order;
1636
1637         /* read warm-up samples */
1638         for(u = 0; u < order; u++) {
1639                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, bps, read_callback_, decoder))
1640                         return false; /* the read_callback_ sets the state for us */
1641                 subframe->warmup[u] = i32;
1642         }
1643
1644         /* read entropy coding method info */
1645         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder))
1646                 return false; /* the read_callback_ sets the state for us */
1647         subframe->entropy_coding_method.type = u32;
1648         switch(subframe->entropy_coding_method.type) {
1649                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1650                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder))
1651                                 return false; /* the read_callback_ sets the state for us */
1652                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
1653                         break;
1654                 default:
1655                         decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1656                         return false;
1657         }
1658
1659         /* read residual */
1660         switch(subframe->entropy_coding_method.type) {
1661                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1662                         if(!stream_decoder_read_residual_partitioned_rice_(decoder, order, &subframe->entropy_coding_method.data.partitioned_rice, decoder->private_->residual[channel]))
1663                                 return false;
1664                         break;
1665                 default:
1666                         FLAC__ASSERT(0);
1667         }
1668
1669         /* decode the subframe */
1670         memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
1671         FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order);
1672
1673         return true;
1674 }
1675
1676 FLAC__bool stream_decoder_read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order)
1677 {
1678         FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc;
1679         FLAC__int32 i32;
1680         FLAC__uint32 u32;
1681         unsigned u;
1682
1683         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC;
1684
1685         subframe->residual = decoder->private_->residual[channel];
1686         subframe->order = order;
1687
1688         /* read warm-up samples */
1689         for(u = 0; u < order; u++) {
1690                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, bps, read_callback_, decoder))
1691                         return false; /* the read_callback_ sets the state for us */
1692                 subframe->warmup[u] = i32;
1693         }
1694
1695         /* read qlp coeff precision */
1696         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN, read_callback_, decoder))
1697                 return false; /* the read_callback_ sets the state for us */
1698         if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) {
1699                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1700                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1701                 return true;
1702         }
1703         subframe->qlp_coeff_precision = u32+1;
1704
1705         /* read qlp shift */
1706         if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN, read_callback_, decoder))
1707                 return false; /* the read_callback_ sets the state for us */
1708         subframe->quantization_level = i32;
1709
1710         /* read quantized lp coefficiencts */
1711         for(u = 0; u < order; u++) {
1712                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision, read_callback_, decoder))
1713                         return false; /* the read_callback_ sets the state for us */
1714                 subframe->qlp_coeff[u] = i32;
1715         }
1716
1717         /* read entropy coding method info */
1718         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder))
1719                 return false; /* the read_callback_ sets the state for us */
1720         subframe->entropy_coding_method.type = u32;
1721         switch(subframe->entropy_coding_method.type) {
1722                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1723                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder))
1724                                 return false; /* the read_callback_ sets the state for us */
1725                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
1726                         break;
1727                 default:
1728                         decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1729                         return false;
1730         }
1731
1732         /* read residual */
1733         switch(subframe->entropy_coding_method.type) {
1734                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1735                         if(!stream_decoder_read_residual_partitioned_rice_(decoder, order, &subframe->entropy_coding_method.data.partitioned_rice, decoder->private_->residual[channel]))
1736                                 return false;
1737                         break;
1738                 default:
1739                         FLAC__ASSERT(0);
1740         }
1741
1742         /* decode the subframe */
1743         memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
1744         if(bps <= 16 && subframe->qlp_coeff_precision <= 16)
1745                 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);
1746         else
1747                 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);
1748
1749         return true;
1750 }
1751
1752 FLAC__bool stream_decoder_read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1753 {
1754         FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim;
1755         FLAC__int32 x, *residual = decoder->private_->residual[channel];
1756         unsigned i;
1757
1758         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM;
1759
1760         subframe->data = residual;
1761
1762         for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
1763                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &x, bps, read_callback_, decoder))
1764                         return false; /* the read_callback_ sets the state for us */
1765                 residual[i] = x;
1766         }
1767
1768         /* decode the subframe */
1769         memcpy(decoder->private_->output[channel], subframe->data, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
1770
1771         return true;
1772 }
1773
1774 FLAC__bool stream_decoder_read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, FLAC__EntropyCodingMethod_PartitionedRice *partitioned_rice, FLAC__int32 *residual)
1775 {
1776         FLAC__uint32 rice_parameter;
1777         int i;
1778         unsigned partition, sample, u;
1779         const unsigned partition_order = partitioned_rice->order;
1780         const unsigned partitions = 1u << partition_order;
1781         const unsigned partition_samples = partition_order > 0? decoder->private_->frame.header.blocksize >> partition_order : decoder->private_->frame.header.blocksize - predictor_order;
1782
1783         sample = 0;
1784         for(partition = 0; partition < partitions; partition++) {
1785                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN, read_callback_, decoder))
1786                         return false; /* the read_callback_ sets the state for us */
1787                 partitioned_rice->parameters[partition] = rice_parameter;
1788                 if(rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1789 #ifdef FLAC__SYMMETRIC_RICE
1790                         for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
1791                                 if(!FLAC__bitbuffer_read_symmetric_rice_signed(decoder->private_->input, &i, rice_parameter, read_callback_, decoder))
1792                                         return false; /* the read_callback_ sets the state for us */
1793                                 residual[sample] = i;
1794                         }
1795 #else
1796                         u = (partition_order == 0 || partition > 0)? partition_samples : partition_samples - predictor_order;
1797                         if(!FLAC__bitbuffer_read_rice_signed_block(decoder->private_->input, residual + sample, u, rice_parameter, read_callback_, decoder))
1798                                 return false; /* the read_callback_ sets the state for us */
1799                         sample += u;
1800 #endif
1801                 }
1802                 else {
1803                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN, read_callback_, decoder))
1804                                 return false; /* the read_callback_ sets the state for us */
1805                         partitioned_rice->raw_bits[partition] = rice_parameter;
1806                         for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
1807                                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i, rice_parameter, read_callback_, decoder))
1808                                         return false; /* the read_callback_ sets the state for us */
1809                                 residual[sample] = i;
1810                         }
1811                 }
1812         }
1813
1814         return true;
1815 }
1816
1817 FLAC__bool stream_decoder_read_zero_padding_(FLAC__StreamDecoder *decoder)
1818 {
1819         if(!FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input)) {
1820                 FLAC__uint32 zero = 0;
1821                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &zero, FLAC__bitbuffer_bits_left_for_byte_alignment(decoder->private_->input), read_callback_, decoder))
1822                         return false; /* the read_callback_ sets the state for us */
1823                 if(zero != 0) {
1824                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1825                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1826                 }
1827         }
1828         return true;
1829 }
1830
1831 FLAC__bool read_callback_(FLAC__byte buffer[], unsigned *bytes, void *client_data)
1832 {
1833         FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data;
1834         FLAC__StreamDecoderReadStatus status;
1835
1836         status = decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data);
1837         if(status == FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM)
1838                 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1839         else if(status == FLAC__STREAM_DECODER_READ_STATUS_ABORT)
1840                 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
1841         return status == FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
1842 }