src/libFLAC/stream_decoder.c

   1 /* libFLAC - Free Lossless Audio Codec library
   2  * Copyright (C) 2000,2001,2002  Josh Coalson
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA  02111-1307, USA.
  18  */
  19
  20 #include <stdio.h>
  21 #include <stdlib.h> /* for malloc() */
  22 #include <string.h> /* for memset/memcpy() */
  23 #include "FLAC/assert.h"
  24 #include "protected/stream_decoder.h"
  25 #include "private/bitbuffer.h"
  26 #include "private/cpu.h"
  27 #include "private/crc.h"
  28 #include "private/fixed.h"
  29 #include "private/lpc.h"
  30
  31 /***********************************************************************
  32  *
  33  * Private static data
  34  *
  35  ***********************************************************************/
  36
  37 static FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' };
  38
  39 /***********************************************************************
  40  *
  41  * Private class method prototypes
  42  *
  43  ***********************************************************************/
  44
  45 static void stream_decoder_set_defaults_(FLAC__StreamDecoder *decoder);
  46 static FLAC__bool stream_decoder_allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels);
  47 static FLAC__bool stream_decoder_has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id);
  48 static FLAC__bool stream_decoder_find_metadata_(FLAC__StreamDecoder *decoder);
  49 static FLAC__bool stream_decoder_read_metadata_(FLAC__StreamDecoder *decoder);
  50 static FLAC__bool stream_decoder_skip_id3v2_tag_(FLAC__StreamDecoder *decoder);
  51 static FLAC__bool stream_decoder_frame_sync_(FLAC__StreamDecoder *decoder);
  52 static FLAC__bool stream_decoder_read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame);
  53 static FLAC__bool stream_decoder_read_frame_header_(FLAC__StreamDecoder *decoder);
  54 static FLAC__bool stream_decoder_read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  55 static FLAC__bool stream_decoder_read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  56 static FLAC__bool stream_decoder_read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order);
  57 static FLAC__bool stream_decoder_read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order);
  58 static FLAC__bool stream_decoder_read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  59 static FLAC__bool stream_decoder_read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, FLAC__EntropyCodingMethod_PartitionedRice *partitioned_rice, FLAC__int32 *residual);
  60 static FLAC__bool stream_decoder_read_zero_padding_(FLAC__StreamDecoder *decoder);
  61 static FLAC__bool read_callback_(FLAC__byte buffer[], unsigned *bytes, void *client_data);
  62
  63 /***********************************************************************
  64  *
  65  * Private class data
  66  *
  67  ***********************************************************************/
  68
  69 typedef struct FLAC__StreamDecoderPrivate {
  70         FLAC__StreamDecoderReadStatus (*read_callback)(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data);
  71         FLAC__StreamDecoderWriteStatus (*write_callback)(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
  72         void (*metadata_callback)(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
  73         void (*error_callback)(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
  74         void (*local_lpc_restore_signal)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
  75         void (*local_lpc_restore_signal_16bit)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
  76         void *client_data;
  77         FLAC__BitBuffer *input;
  78         FLAC__int32 *output[FLAC__MAX_CHANNELS];
  79         FLAC__int32 *residual[FLAC__MAX_CHANNELS];
  80         unsigned output_capacity, output_channels;
  81         FLAC__uint32 last_frame_number;
  82         FLAC__uint64 samples_decoded;
  83         FLAC__bool has_stream_info, has_seek_table;
  84         FLAC__StreamMetadata stream_info;
  85         FLAC__StreamMetadata seek_table;
  86         FLAC__bool metadata_filter[FLAC__METADATA_TYPE_VORBIS_COMMENT+1];
  87         FLAC__byte *metadata_filter_ids;
  88         unsigned metadata_filter_ids_count, metadata_filter_ids_capacity; /* units for both are IDs, not bytes */
  89         FLAC__Frame frame;
  90         FLAC__bool cached; /* true if there is a byte in lookahead */
  91         FLAC__CPUInfo cpuinfo;
  92         FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */
  93         FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */
  94 } FLAC__StreamDecoderPrivate;
  95
  96 /***********************************************************************
  97  *
  98  * Public static class data
  99  *
 100  ***********************************************************************/
 101
 102 const char * const FLAC__StreamDecoderStateString[] = {
 103         "FLAC__STREAM_DECODER_SEARCH_FOR_METADATA",
 104         "FLAC__STREAM_DECODER_READ_METADATA",
 105         "FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC",
 106         "FLAC__STREAM_DECODER_READ_FRAME",
 107         "FLAC__STREAM_DECODER_END_OF_STREAM",
 108         "FLAC__STREAM_DECODER_ABORTED",
 109         "FLAC__STREAM_DECODER_UNPARSEABLE_STREAM",
 110         "FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR",
 111         "FLAC__STREAM_DECODER_ALREADY_INITIALIZED",
 112         "FLAC__STREAM_DECODER_INVALID_CALLBACK",
 113         "FLAC__STREAM_DECODER_UNINITIALIZED"
 114 };
 115
 116 const char * const FLAC__StreamDecoderReadStatusString[] = {
 117         "FLAC__STREAM_DECODER_READ_STATUS_CONTINUE",
 118         "FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM",
 119         "FLAC__STREAM_DECODER_READ_STATUS_ABORT"
 120 };
 121
 122 const char * const FLAC__StreamDecoderWriteStatusString[] = {
 123         "FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE",
 124         "FLAC__STREAM_DECODER_WRITE_STATUS_ABORT"
 125 };
 126
 127 const char * const FLAC__StreamDecoderErrorStatusString[] = {
 128         "FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC",
 129         "FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER",
 130         "FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH"
 131 };
 132
 133 /***********************************************************************
 134  *
 135  * Class constructor/destructor
 136  *
 137  ***********************************************************************/
 138 FLAC__StreamDecoder *FLAC__stream_decoder_new()
 139 {
 140         FLAC__StreamDecoder *decoder;
 141         unsigned i;
 142
 143         FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
 144
 145         decoder = (FLAC__StreamDecoder*)malloc(sizeof(FLAC__StreamDecoder));
 146         if(decoder == 0) {
 147                 return 0;
 148         }
 149         decoder->protected_ = (FLAC__StreamDecoderProtected*)malloc(sizeof(FLAC__StreamDecoderProtected));
 150         if(decoder->protected_ == 0) {
 151                 free(decoder);
 152                 return 0;
 153         }
 154         decoder->private_ = (FLAC__StreamDecoderPrivate*)malloc(sizeof(FLAC__StreamDecoderPrivate));
 155         if(decoder->private_ == 0) {
 156                 free(decoder->protected_);
 157                 free(decoder);
 158                 return 0;
 159         }
 160         decoder->private_->input = FLAC__bitbuffer_new();
 161         if(decoder->private_->input == 0) {
 162                 free(decoder->private_);
 163                 free(decoder->protected_);
 164                 free(decoder);
 165                 return 0;
 166         }
 167
 168         decoder->private_->metadata_filter_ids_capacity = 16;
 169         if(0 == (decoder->private_->metadata_filter_ids = malloc((FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) * decoder->private_->metadata_filter_ids_capacity))) {
 170                 FLAC__bitbuffer_delete(decoder->private_->input);
 171                 free(decoder->private_);
 172                 free(decoder->protected_);
 173                 free(decoder);
 174                 return 0;
 175         }
 176
 177         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 178                 decoder->private_->output[i] = 0;
 179                 decoder->private_->residual[i] = 0;
 180         }
 181
 182         decoder->private_->output_capacity = 0;
 183         decoder->private_->output_channels = 0;
 184         decoder->private_->has_seek_table = false;
 185
 186         stream_decoder_set_defaults_(decoder);
 187
 188         decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
 189
 190         return decoder;
 191 }
 192
 193 void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder)
 194 {
 195         FLAC__ASSERT(decoder != 0);
 196         FLAC__ASSERT(decoder->protected_ != 0);
 197         FLAC__ASSERT(decoder->private_ != 0);
 198         FLAC__ASSERT(decoder->private_->input != 0);
 199
 200         FLAC__stream_decoder_finish(decoder);
 201
 202         if(decoder->private_->metadata_filter_ids != 0)
 203                 free(decoder->private_->metadata_filter_ids);
 204
 205         FLAC__bitbuffer_delete(decoder->private_->input);
 206         free(decoder->private_);
 207         free(decoder->protected_);
 208         free(decoder);
 209 }
 210
 211 /***********************************************************************
 212  *
 213  * Public class methods
 214  *
 215  ***********************************************************************/
 216
 217 FLAC__StreamDecoderState FLAC__stream_decoder_init(FLAC__StreamDecoder *decoder)
 218 {
 219         FLAC__ASSERT(decoder != 0);
 220
 221         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 222                 return decoder->protected_->state = FLAC__STREAM_DECODER_ALREADY_INITIALIZED;
 223
 224         if(0 == decoder->private_->read_callback || 0 == decoder->private_->write_callback || 0 == decoder->private_->metadata_callback || 0 == decoder->private_->error_callback)
 225                 return decoder->protected_->state = FLAC__STREAM_DECODER_INVALID_CALLBACK;
 226
 227         if(!FLAC__bitbuffer_init(decoder->private_->input))
 228                 return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 229
 230         decoder->private_->last_frame_number = 0;
 231         decoder->private_->samples_decoded = 0;
 232         decoder->private_->has_stream_info = false;
 233         decoder->private_->cached = false;
 234
 235         /*
 236          * get the CPU info and set the function pointers
 237          */
 238         FLAC__cpu_info(&decoder->private_->cpuinfo);
 239         /* first default to the non-asm routines */
 240         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal;
 241         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal;
 242         /* now override with asm where appropriate */
 243 #ifndef FLAC__NO_ASM
 244         if(decoder->private_->cpuinfo.use_asm) {
 245 #ifdef FLAC__CPU_IA32
 246                 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
 247 #ifdef FLAC__HAS_NASM
 248                 if(decoder->private_->cpuinfo.data.ia32.mmx) {
 249                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
 250                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32_mmx;
 251                 }
 252                 else {
 253                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
 254                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32;
 255                 }
 256 #endif
 257 #endif
 258         }
 259 #endif
 260
 261         return decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
 262 }
 263
 264 void FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder)
 265 {
 266         unsigned i;
 267         FLAC__ASSERT(decoder != 0);
 268         if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
 269                 return;
 270         if(decoder->private_->has_seek_table) {
 271                 FLAC__ASSERT(decoder->private_->seek_table.data.seek_table.points != 0);
 272                 free(decoder->private_->seek_table.data.seek_table.points);
 273                 decoder->private_->seek_table.data.seek_table.points = 0;
 274                 decoder->private_->has_seek_table = false;
 275         }
 276         FLAC__bitbuffer_free(decoder->private_->input);
 277         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 278                 /* WATCHOUT: FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the output arrays have a buffer of up to 3 zeroes in front (at negative indices) for alignment purposes; we use 4 to keep the data well-aligned. */
 279                 if(decoder->private_->output[i] != 0) {
 280                         free(decoder->private_->output[i]-4);
 281                         decoder->private_->output[i] = 0;
 282                 }
 283                 if(decoder->private_->residual[i] != 0) {
 284                         free(decoder->private_->residual[i]);
 285                         decoder->private_->residual[i] = 0;
 286                 }
 287         }
 288         decoder->private_->output_capacity = 0;
 289         decoder->private_->output_channels = 0;
 290
 291         stream_decoder_set_defaults_(decoder);
 292
 293         decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
 294 }
 295
 296 FLAC__bool FLAC__stream_decoder_set_read_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderReadStatus (*value)(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data))
 297 {
 298         FLAC__ASSERT(decoder != 0);
 299         FLAC__ASSERT(decoder->private_ != 0);
 300         FLAC__ASSERT(decoder->protected_ != 0);
 301         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 302                 return false;
 303         decoder->private_->read_callback = value;
 304         return true;
 305 }
 306
 307 FLAC__bool FLAC__stream_decoder_set_write_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderWriteStatus (*value)(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data))
 308 {
 309         FLAC__ASSERT(decoder != 0);
 310         FLAC__ASSERT(decoder->private_ != 0);
 311         FLAC__ASSERT(decoder->protected_ != 0);
 312         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 313                 return false;
 314         decoder->private_->write_callback = value;
 315         return true;
 316 }
 317
 318 FLAC__bool FLAC__stream_decoder_set_metadata_callback(FLAC__StreamDecoder *decoder, void (*value)(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data))
 319 {
 320         FLAC__ASSERT(decoder != 0);
 321         FLAC__ASSERT(decoder->private_ != 0);
 322         FLAC__ASSERT(decoder->protected_ != 0);
 323         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 324                 return false;
 325         decoder->private_->metadata_callback = value;
 326         return true;
 327 }
 328
 329 FLAC__bool FLAC__stream_decoder_set_error_callback(FLAC__StreamDecoder *decoder, void (*value)(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data))
 330 {
 331         FLAC__ASSERT(decoder != 0);
 332         FLAC__ASSERT(decoder->private_ != 0);
 333         FLAC__ASSERT(decoder->protected_ != 0);
 334         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 335                 return false;
 336         decoder->private_->error_callback = value;
 337         return true;
 338 }
 339
 340 FLAC__bool FLAC__stream_decoder_set_client_data(FLAC__StreamDecoder *decoder, void *value)
 341 {
 342         FLAC__ASSERT(decoder != 0);
 343         FLAC__ASSERT(decoder->private_ != 0);
 344         FLAC__ASSERT(decoder->protected_ != 0);
 345         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 346                 return false;
 347         decoder->private_->client_data = value;
 348         return true;
 349 }
 350
 351 FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
 352 {
 353         FLAC__ASSERT(decoder != 0);
 354         FLAC__ASSERT(decoder->private_ != 0);
 355         FLAC__ASSERT(decoder->protected_ != 0);
 356         FLAC__ASSERT(type <= FLAC__METADATA_TYPE_VORBIS_COMMENT);
 357         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 358                 return false;
 359         decoder->private_->metadata_filter[type] = true;
 360         if(type == FLAC__METADATA_TYPE_APPLICATION)
 361                 decoder->private_->metadata_filter_ids_count = 0;
 362         return true;
 363 }
 364
 365 FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
 366 {
 367         FLAC__ASSERT(decoder != 0);
 368         FLAC__ASSERT(decoder->private_ != 0);
 369         FLAC__ASSERT(decoder->protected_ != 0);
 370         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 371                 return false;
 372
 373         if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
 374                 return true;
 375
 376         FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
 377
 378         if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
 379                 if(0 == (decoder->private_->metadata_filter_ids = realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2)))
 380                         return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 381                 decoder->private_->metadata_filter_ids_capacity *= 2;
 382         }
 383
 384         memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8));
 385         decoder->private_->metadata_filter_ids_count++;
 386
 387         return true;
 388 }
 389
 390 FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder)
 391 {
 392         unsigned i;
 393         FLAC__ASSERT(decoder != 0);
 394         FLAC__ASSERT(decoder->private_ != 0);
 395         FLAC__ASSERT(decoder->protected_ != 0);
 396         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 397                 return false;
 398         for(i = 0; i < sizeof(decoder->private_->metadata_filter) / sizeof(decoder->private_->metadata_filter[0]); i++)
 399                 decoder->private_->metadata_filter[i] = true;
 400         decoder->private_->metadata_filter_ids_count = 0;
 401         return true;
 402 }
 403
 404 FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
 405 {
 406         FLAC__ASSERT(decoder != 0);
 407         FLAC__ASSERT(decoder->private_ != 0);
 408         FLAC__ASSERT(decoder->protected_ != 0);
 409         FLAC__ASSERT(type <= FLAC__METADATA_TYPE_VORBIS_COMMENT);
 410         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 411                 return false;
 412         decoder->private_->metadata_filter[type] = false;
 413         if(type == FLAC__METADATA_TYPE_APPLICATION)
 414                 decoder->private_->metadata_filter_ids_count = 0;
 415         return true;
 416 }
 417
 418 FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
 419 {
 420         FLAC__ASSERT(decoder != 0);
 421         FLAC__ASSERT(decoder->private_ != 0);
 422         FLAC__ASSERT(decoder->protected_ != 0);
 423         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 424                 return false;
 425
 426         if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
 427                 return true;
 428
 429         FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
 430
 431         if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
 432                 if(0 == (decoder->private_->metadata_filter_ids = realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2)))
 433                         return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 434                 decoder->private_->metadata_filter_ids_capacity *= 2;
 435         }
 436
 437         memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8));
 438         decoder->private_->metadata_filter_ids_count++;
 439
 440         return true;
 441 }
 442
 443 FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder)
 444 {
 445         FLAC__ASSERT(decoder != 0);
 446         FLAC__ASSERT(decoder->private_ != 0);
 447         FLAC__ASSERT(decoder->protected_ != 0);
 448         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 449                 return false;
 450         memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
 451         decoder->private_->metadata_filter_ids_count = 0;
 452         return true;
 453 }
 454
 455 FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder)
 456 {
 457         FLAC__ASSERT(decoder != 0);
 458         FLAC__ASSERT(decoder->protected_ != 0);
 459         return decoder->protected_->state;
 460 }
 461
 462 unsigned FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder)
 463 {
 464         FLAC__ASSERT(decoder != 0);
 465         FLAC__ASSERT(decoder->protected_ != 0);
 466         return decoder->protected_->channels;
 467 }
 468
 469 FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder)
 470 {
 471         FLAC__ASSERT(decoder != 0);
 472         FLAC__ASSERT(decoder->protected_ != 0);
 473         return decoder->protected_->channel_assignment;
 474 }
 475
 476 unsigned FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder)
 477 {
 478         FLAC__ASSERT(decoder != 0);
 479         FLAC__ASSERT(decoder->protected_ != 0);
 480         return decoder->protected_->bits_per_sample;
 481 }
 482
 483 unsigned FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder)
 484 {
 485         FLAC__ASSERT(decoder != 0);
 486         FLAC__ASSERT(decoder->protected_ != 0);
 487         return decoder->protected_->sample_rate;
 488 }
 489
 490 unsigned FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder)
 491 {
 492         FLAC__ASSERT(decoder != 0);
 493         FLAC__ASSERT(decoder->protected_ != 0);
 494         return decoder->protected_->blocksize;
 495 }
 496
 497 FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder)
 498 {
 499         FLAC__ASSERT(decoder != 0);
 500         FLAC__ASSERT(decoder->private_ != 0);
 501         FLAC__ASSERT(decoder->protected_ != 0);
 502
 503         if(!FLAC__bitbuffer_clear(decoder->private_->input)) {
 504                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 505                 return false;
 506         }
 507         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 508
 509         return true;
 510 }
 511
 512 FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder)
 513 {
 514         FLAC__ASSERT(decoder != 0);
 515         FLAC__ASSERT(decoder->private_ != 0);
 516         FLAC__ASSERT(decoder->protected_ != 0);
 517
 518         if(!FLAC__stream_decoder_flush(decoder)) {
 519                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 520                 return false;
 521         }
 522         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
 523
 524         decoder->private_->samples_decoded = 0;
 525
 526         return true;
 527 }
 528
 529 FLAC__bool FLAC__stream_decoder_process_whole_stream(FLAC__StreamDecoder *decoder)
 530 {
 531         FLAC__bool dummy;
 532         FLAC__ASSERT(decoder != 0);
 533
 534         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 535                 return true;
 536
 537         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA);
 538
 539         if(!FLAC__stream_decoder_reset(decoder)) {
 540                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 541                 return false;
 542         }
 543
 544         while(1) {
 545                 switch(decoder->protected_->state) {
 546                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
 547                                 if(!stream_decoder_find_metadata_(decoder))
 548                                         return false; /* above function sets the status for us */
 549                                 break;
 550                         case FLAC__STREAM_DECODER_READ_METADATA:
 551                                 if(!stream_decoder_read_metadata_(decoder))
 552                                         return false; /* above function sets the status for us */
 553                                 break;
 554                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 555                                 if(!stream_decoder_frame_sync_(decoder))
 556                                         return true; /* above function sets the status for us */
 557                                 break;
 558                         case FLAC__STREAM_DECODER_READ_FRAME:
 559                                 if(!stream_decoder_read_frame_(decoder, &dummy))
 560                                         return false; /* above function sets the status for us */
 561                                 break;
 562                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 563                                 return true;
 564                         default:
 565                                 FLAC__ASSERT(0);
 566                 }
 567         }
 568 }
 569
 570 FLAC__bool FLAC__stream_decoder_process_metadata(FLAC__StreamDecoder *decoder)
 571 {
 572         FLAC__ASSERT(decoder != 0);
 573
 574         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 575                 return true;
 576
 577         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA);
 578
 579         if(!FLAC__stream_decoder_reset(decoder)) {
 580                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 581                 return false;
 582         }
 583
 584         while(1) {
 585                 switch(decoder->protected_->state) {
 586                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
 587                                 if(!stream_decoder_find_metadata_(decoder))
 588                                         return false; /* above function sets the status for us */
 589                                 break;
 590                         case FLAC__STREAM_DECODER_READ_METADATA:
 591                                 if(!stream_decoder_read_metadata_(decoder))
 592                                         return false; /* above function sets the status for us */
 593                                 break;
 594                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 595                                 return true;
 596                         case FLAC__STREAM_DECODER_READ_FRAME:
 597                                 return true;
 598                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 599                                 return true;
 600                         default:
 601                                 FLAC__ASSERT(0);
 602                 }
 603         }
 604 }
 605
 606 FLAC__bool FLAC__stream_decoder_process_one_frame(FLAC__StreamDecoder *decoder)
 607 {
 608         FLAC__bool got_a_frame;
 609         FLAC__ASSERT(decoder != 0);
 610
 611         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 612                 return true;
 613
 614         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC);
 615
 616         while(1) {
 617                 switch(decoder->protected_->state) {
 618                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 619                                 if(!stream_decoder_frame_sync_(decoder))
 620                                         return true; /* above function sets the status for us */
 621                                 break;
 622                         case FLAC__STREAM_DECODER_READ_FRAME:
 623                                 if(!stream_decoder_read_frame_(decoder, &got_a_frame))
 624                                         return false; /* above function sets the status for us */
 625                                 if(got_a_frame)
 626                                         return true; /* above function sets the status for us */
 627                                 break;
 628                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 629                                 return true;
 630                         default:
 631                                 FLAC__ASSERT(0);
 632                 }
 633         }
 634 }
 635
 636 FLAC__bool FLAC__stream_decoder_process_remaining_frames(FLAC__StreamDecoder *decoder)
 637 {
 638         FLAC__bool dummy;
 639         FLAC__ASSERT(decoder != 0);
 640
 641         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 642                 return true;
 643
 644         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC);
 645
 646         while(1) {
 647                 switch(decoder->protected_->state) {
 648                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 649                                 if(!stream_decoder_frame_sync_(decoder))
 650                                         return true; /* above function sets the status for us */
 651                                 break;
 652                         case FLAC__STREAM_DECODER_READ_FRAME:
 653                                 if(!stream_decoder_read_frame_(decoder, &dummy))
 654                                         return false; /* above function sets the status for us */
 655                                 break;
 656                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 657                                 return true;
 658                         default:
 659                                 FLAC__ASSERT(0);
 660                 }
 661         }
 662 }
 663
 664 /***********************************************************************
 665  *
 666  * Protected class methods
 667  *
 668  ***********************************************************************/
 669
 670 unsigned FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder)
 671 {
 672         FLAC__ASSERT(decoder != 0);
 673         return FLAC__bitbuffer_get_input_bytes_unconsumed(decoder->private_->input);
 674 }
 675
 676 /***********************************************************************
 677  *
 678  * Private class methods
 679  *
 680  ***********************************************************************/
 681
 682 void stream_decoder_set_defaults_(FLAC__StreamDecoder *decoder)
 683 {
 684         decoder->private_->read_callback = 0;
 685         decoder->private_->write_callback = 0;
 686         decoder->private_->metadata_callback = 0;
 687         decoder->private_->error_callback = 0;
 688         decoder->private_->client_data = 0;
 689
 690         memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
 691         decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] = true;
 692         decoder->private_->metadata_filter_ids_count = 0;
 693 }
 694
 695 FLAC__bool stream_decoder_allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels)
 696 {
 697         unsigned i;
 698         FLAC__int32 *tmp;
 699
 700         if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels)
 701                 return true;
 702
 703         /* @@@ should change to use realloc() */
 704
 705         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 706                 if(decoder->private_->output[i] != 0) {
 707                         free(decoder->private_->output[i]);
 708                         decoder->private_->output[i] = 0;
 709                 }
 710                 if(decoder->private_->residual[i] != 0) {
 711                         free(decoder->private_->residual[i]);
 712                         decoder->private_->residual[i] = 0;
 713                 }
 714         }
 715
 716         for(i = 0; i < channels; i++) {
 717                 /* 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. */
 718                 tmp = (FLAC__int32*)malloc(sizeof(FLAC__int32)*(size+4));
 719                 if(tmp == 0) {
 720                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 721                         return false;
 722                 }
 723                 memset(tmp, 0, sizeof(FLAC__int32)*4);
 724                 decoder->private_->output[i] = tmp + 4;
 725
 726                 tmp = (FLAC__int32*)malloc(sizeof(FLAC__int32)*size);
 727                 if(tmp == 0) {
 728                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 729                         return false;
 730                 }
 731                 decoder->private_->residual[i] = tmp;
 732         }
 733
 734         decoder->private_->output_capacity = size;
 735         decoder->private_->output_channels = channels;
 736
 737         return true;
 738 }
 739
 740 FLAC__bool stream_decoder_has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id)
 741 {
 742         unsigned i;
 743
 744         FLAC__ASSERT(0 != decoder);
 745         FLAC__ASSERT(0 != decoder->private_);
 746
 747         for(i = 0; i < decoder->private_->metadata_filter_ids_count; i++)
 748                 if(0 == memcmp(decoder->private_->metadata_filter_ids + i * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)))
 749                         return true;
 750
 751         return false;
 752 }
 753
 754 FLAC__bool stream_decoder_find_metadata_(FLAC__StreamDecoder *decoder)
 755 {
 756         FLAC__uint32 x;
 757         unsigned i, id;
 758         FLAC__bool first = true;
 759
 760         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
 761
 762         for(i = id = 0; i < 4; ) {
 763                 if(decoder->private_->cached) {
 764                         x = (FLAC__uint32)decoder->private_->lookahead;
 765                         decoder->private_->cached = false;
 766                 }
 767                 else {
 768                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
 769                                 return false; /* the read_callback_ sets the state for us */
 770                 }
 771                 if(x == FLAC__STREAM_SYNC_STRING[i]) {
 772                         first = true;
 773                         i++;
 774                         id = 0;
 775                         continue;
 776                 }
 777                 if(x == ID3V2_TAG_[id]) {
 778                         id++;
 779                         i = 0;
 780                         if(id == 3) {
 781                                 if(!stream_decoder_skip_id3v2_tag_(decoder))
 782                                         return false; /* the read_callback_ sets the state for us */
 783                         }
 784                         continue;
 785                 }
 786                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 787                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
 788                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
 789                                 return false; /* the read_callback_ sets the state for us */
 790
 791                         /* 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 */
 792                         /* else we have to check if the second byte is the end of a sync code */
 793                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 794                                 decoder->private_->lookahead = (FLAC__byte)x;
 795                                 decoder->private_->cached = true;
 796                         }
 797                         else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
 798                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
 799                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
 800                                 return true;
 801                         }
 802                 }
 803                 i = 0;
 804                 if(first) {
 805                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
 806                         first = false;
 807                 }
 808         }
 809
 810         decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA;
 811         return true;
 812 }
 813
 814 FLAC__bool stream_decoder_read_metadata_(FLAC__StreamDecoder *decoder)
 815 {
 816         FLAC__uint32 i, x, last_block, type, length;
 817         FLAC__uint64 xx;
 818
 819         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
 820
 821         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &last_block, FLAC__STREAM_METADATA_IS_LAST_LEN, read_callback_, decoder))
 822                 return false; /* the read_callback_ sets the state for us */
 823         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN, read_callback_, decoder))
 824                 return false; /* the read_callback_ sets the state for us */
 825         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN, read_callback_, decoder))
 826                 return false; /* the read_callback_ sets the state for us */
 827         if(type == FLAC__METADATA_TYPE_STREAMINFO) {
 828                 unsigned used_bits = 0;
 829                 decoder->private_->stream_info.type = type;
 830                 decoder->private_->stream_info.is_last = last_block;
 831                 decoder->private_->stream_info.length = length;
 832
 833                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN, read_callback_, decoder))
 834                         return false; /* the read_callback_ sets the state for us */
 835                 decoder->private_->stream_info.data.stream_info.min_blocksize = x;
 836                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN;
 837
 838                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN, read_callback_, decoder))
 839                         return false; /* the read_callback_ sets the state for us */
 840                 decoder->private_->stream_info.data.stream_info.max_blocksize = x;
 841                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN;
 842
 843                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN, read_callback_, decoder))
 844                         return false; /* the read_callback_ sets the state for us */
 845                 decoder->private_->stream_info.data.stream_info.min_framesize = x;
 846                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN;
 847
 848                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN, read_callback_, decoder))
 849                         return false; /* the read_callback_ sets the state for us */
 850                 decoder->private_->stream_info.data.stream_info.max_framesize = x;
 851                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN;
 852
 853                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN, read_callback_, decoder))
 854                         return false; /* the read_callback_ sets the state for us */
 855                 decoder->private_->stream_info.data.stream_info.sample_rate = x;
 856                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN;
 857
 858                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN, read_callback_, decoder))
 859                         return false; /* the read_callback_ sets the state for us */
 860                 decoder->private_->stream_info.data.stream_info.channels = x+1;
 861                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN;
 862
 863                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN, read_callback_, decoder))
 864                         return false; /* the read_callback_ sets the state for us */
 865                 decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1;
 866                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN;
 867
 868                 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))
 869                         return false; /* the read_callback_ sets the state for us */
 870                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN;
 871
 872                 if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, decoder->private_->stream_info.data.stream_info.md5sum, 16, read_callback_, decoder))
 873                         return false; /* the read_callback_ sets the state for us */
 874                 used_bits += 16*8;
 875
 876                 /* skip the rest of the block */
 877                 FLAC__ASSERT(used_bits % 8 == 0);
 878                 length -= (used_bits / 8);
 879                 if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, length, read_callback_, decoder))
 880                         return false; /* the read_callback_ sets the state for us */
 881
 882                 decoder->private_->has_stream_info = true;
 883                 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO])
 884                         decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data);
 885         }
 886         else if(type == FLAC__METADATA_TYPE_SEEKTABLE) {
 887                 decoder->private_->seek_table.type = type;
 888                 decoder->private_->seek_table.is_last = last_block;
 889                 decoder->private_->seek_table.length = length;
 890
 891                 decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
 892
 893                 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)))) {
 894                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 895                         return false;
 896                 }
 897                 for(i = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) {
 898                         if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN, read_callback_, decoder))
 899                                 return false; /* the read_callback_ sets the state for us */
 900                         decoder->private_->seek_table.data.seek_table.points[i].sample_number = xx;
 901
 902                         if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_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].stream_offset = xx;
 905
 906                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_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].frame_samples = x;
 909                 }
 910                 length -= (decoder->private_->seek_table.data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH);
 911                 /* if there is a partial point left, skip over it */
 912                 if(length > 0) {
 913                         /*@@@ do an error_callback() here?  there's an argument for either way */
 914                         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, length, read_callback_, decoder))
 915                                 return false; /* the read_callback_ sets the state for us */
 916                 }
 917
 918                 decoder->private_->has_seek_table = true;
 919                 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_SEEKTABLE])
 920                         decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data);
 921         }
 922         else {
 923                 FLAC__bool skip_it = !decoder->private_->metadata_filter[type];
 924                 unsigned real_length = length;
 925                 FLAC__StreamMetadata block;
 926
 927                 block.is_last = last_block;
 928                 block.type = type;
 929                 block.length = length;
 930
 931                 if(type == FLAC__METADATA_TYPE_APPLICATION) {
 932                         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, block.data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8, read_callback_, decoder))
 933                                 return false; /* the read_callback_ sets the state for us */
 934
 935                         real_length -= FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8;
 936
 937                         if(decoder->private_->metadata_filter_ids_count > 0 && stream_decoder_has_id_filtered_(decoder, block.data.application.id))
 938                                 skip_it = !skip_it;
 939                 }
 940
 941                 if(skip_it) {
 942                         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, real_length, read_callback_, decoder))
 943                                 return false; /* the read_callback_ sets the state for us */
 944                 }
 945                 else {
 946                         switch(type) {
 947                                 case FLAC__METADATA_TYPE_PADDING:
 948                                         /* skip the padding bytes */
 949                                         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, real_length, read_callback_, decoder))
 950                                                 return false; /* the read_callback_ sets the state for us */
 951                                         break;
 952                                 case FLAC__METADATA_TYPE_APPLICATION:
 953                                         /* remember, we read the ID already */
 954                                         if(real_length > 0) {
 955                                                 if(0 == (block.data.application.data = malloc(real_length))) {
 956                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 957                                                         return false;
 958                                                 }
 959                                                 if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, block.data.application.data, real_length, read_callback_, decoder))
 960                                                         return false; /* the read_callback_ sets the state for us */
 961                                         }
 962                                         else
 963                                                 block.data.application.data = 0;
 964                                         break;
 965                                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 966                                         /* read vendor string */
 967                                         FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
 968                                         if(!FLAC__bitbuffer_read_raw_uint32_little_endian(decoder->private_->input, &block.data.vorbis_comment.vendor_string.length, read_callback_, decoder))
 969                                                 return false; /* the read_callback_ sets the state for us */
 970                                         if(block.data.vorbis_comment.vendor_string.length > 0) {
 971                                                 if(0 == (block.data.vorbis_comment.vendor_string.entry = malloc(block.data.vorbis_comment.vendor_string.length))) {
 972                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 973                                                         return false;
 974                                                 }
 975                                                 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))
 976                                                         return false; /* the read_callback_ sets the state for us */
 977                                         }
 978                                         else
 979                                                 block.data.vorbis_comment.vendor_string.entry = 0;
 980
 981                                         /* read num comments */
 982                                         FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN == 32);
 983                                         if(!FLAC__bitbuffer_read_raw_uint32_little_endian(decoder->private_->input, &block.data.vorbis_comment.num_comments, read_callback_, decoder))
 984                                                 return false; /* the read_callback_ sets the state for us */
 985
 986                                         /* read comments */
 987                                         if(block.data.vorbis_comment.num_comments > 0) {
 988                                                 if(0 == (block.data.vorbis_comment.comments = malloc(block.data.vorbis_comment.num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) {
 989                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 990                                                         return false;
 991                                                 }
 992                                                 for(i = 0; i < block.data.vorbis_comment.num_comments; i++) {
 993                                                         FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
 994                                                         if(!FLAC__bitbuffer_read_raw_uint32_little_endian(decoder->private_->input, &block.data.vorbis_comment.comments[i].length, read_callback_, decoder))
 995                                                                 return false; /* the read_callback_ sets the state for us */
 996                                                         if(block.data.vorbis_comment.comments[i].length > 0) {
 997                                                                 if(0 == (block.data.vorbis_comment.comments[i].entry = malloc(block.data.vorbis_comment.comments[i].length))) {
 998                                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 999                                                                         return false;
1000                                                                 }
1001                                                                 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))
1002                                                                         return false; /* the read_callback_ sets the state for us */
1003                                                         }
1004                                                         else
1005                                                                 block.data.vorbis_comment.comments[i].entry = 0;
1006                                                 }
1007                                         }
1008                                         else {
1009                                                 block.data.vorbis_comment.comments = 0;
1010                                         }
1011                                         break;
1012                                 case FLAC__METADATA_TYPE_STREAMINFO:
1013                                 case FLAC__METADATA_TYPE_SEEKTABLE:
1014                                 default:
1015                                         FLAC__ASSERT(0);
1016                         }
1017                         decoder->private_->metadata_callback(decoder, &block, decoder->private_->client_data);
1018
1019                         /* now we have to free any malloc'ed data in the block */
1020                         switch(type) {
1021                                 case FLAC__METADATA_TYPE_PADDING:
1022                                         break;
1023                                 case FLAC__METADATA_TYPE_APPLICATION:
1024                                         if(0 != block.data.application.data)
1025                                                 free(block.data.application.data);
1026                                         break;
1027                                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1028                                         if(0 != block.data.vorbis_comment.vendor_string.entry)
1029                                                 free(block.data.vorbis_comment.vendor_string.entry);
1030                                         if(block.data.vorbis_comment.num_comments > 0)
1031                                                 for(i = 0; i < block.data.vorbis_comment.num_comments; i++)
1032                                                         if(0 != block.data.vorbis_comment.comments[i].entry)
1033                                                                 free(block.data.vorbis_comment.comments[i].entry);
1034                                         if(0 != block.data.vorbis_comment.comments)
1035                                                 free(block.data.vorbis_comment.comments);
1036                                         break;
1037                                 case FLAC__METADATA_TYPE_STREAMINFO:
1038                                 case FLAC__METADATA_TYPE_SEEKTABLE:
1039                                 default:
1040                                         FLAC__ASSERT(0);
1041                         }
1042                 }
1043         }
1044
1045         if(last_block)
1046                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1047
1048         return true;
1049 }
1050
1051 FLAC__bool stream_decoder_skip_id3v2_tag_(FLAC__StreamDecoder *decoder)
1052 {
1053         FLAC__uint32 x;
1054         unsigned i, skip;
1055
1056         /* skip the version and flags bytes */
1057         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 24, read_callback_, decoder))
1058                 return false; /* the read_callback_ sets the state for us */
1059         /* get the size (in bytes) to skip */
1060         skip = 0;
1061         for(i = 0; i < 4; i++) {
1062                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1063                         return false; /* the read_callback_ sets the state for us */
1064                 skip <<= 7;
1065                 skip |= (x & 0x7f);
1066         }
1067         /* skip the rest of the tag */
1068         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, skip, read_callback_, decoder))
1069                 return false; /* the read_callback_ sets the state for us */
1070         return true;
1071 }
1072
1073 FLAC__bool stream_decoder_frame_sync_(FLAC__StreamDecoder *decoder)
1074 {
1075         FLAC__uint32 x;
1076         FLAC__bool first = true;
1077
1078         /* If we know the total number of samples in the stream, stop if we've read that many. */
1079         /* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */
1080         if(decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.total_samples) {
1081                 if(decoder->private_->samples_decoded >= decoder->private_->stream_info.data.stream_info.total_samples) {
1082                         decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1083                         return true;
1084                 }
1085         }
1086
1087         /* make sure we're byte aligned */
1088         if(!FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input)) {
1089                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__bitbuffer_bits_left_for_byte_alignment(decoder->private_->input), read_callback_, decoder))
1090                         return false; /* the read_callback_ sets the state for us */
1091         }
1092
1093         while(1) {
1094                 if(decoder->private_->cached) {
1095                         x = (FLAC__uint32)decoder->private_->lookahead;
1096                         decoder->private_->cached = false;
1097                 }
1098                 else {
1099                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1100                                 return false; /* the read_callback_ sets the state for us */
1101                 }
1102                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1103                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
1104                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1105                                 return false; /* the read_callback_ sets the state for us */
1106
1107                         /* 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 */
1108                         /* else we have to check if the second byte is the end of a sync code */
1109                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1110                                 decoder->private_->lookahead = (FLAC__byte)x;
1111                                 decoder->private_->cached = true;
1112                         }
1113                         else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
1114                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
1115                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
1116                                 return true;
1117                         }
1118                 }
1119                 if(first) {
1120                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1121                         first = false;
1122                 }
1123         }
1124
1125         return true;
1126 }
1127
1128 FLAC__bool stream_decoder_read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame)
1129 {
1130         unsigned channel;
1131         unsigned i;
1132         FLAC__int32 mid, side, left, right;
1133         FLAC__uint16 frame_crc; /* the one we calculate from the input stream */
1134         FLAC__uint32 x;
1135
1136         *got_a_frame = false;
1137
1138         /* init the CRC */
1139         frame_crc = 0;
1140         FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc);
1141         FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc);
1142         FLAC__bitbuffer_reset_read_crc16(decoder->private_->input, frame_crc);
1143
1144         if(!stream_decoder_read_frame_header_(decoder))
1145                 return false;
1146         if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC)
1147                 return true;
1148         if(!stream_decoder_allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels))
1149                 return false;
1150         for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
1151                 /*
1152                  * first figure the correct bits-per-sample of the subframe
1153                  */
1154                 unsigned bps = decoder->private_->frame.header.bits_per_sample;
1155                 switch(decoder->private_->frame.header.channel_assignment) {
1156                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1157                                 /* no adjustment needed */
1158                                 break;
1159                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1160                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1161                                 if(channel == 1)
1162                                         bps++;
1163                                 break;
1164                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1165                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1166                                 if(channel == 0)
1167                                         bps++;
1168                                 break;
1169                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1170                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1171                                 if(channel == 1)
1172                                         bps++;
1173                                 break;
1174                         default:
1175                                 FLAC__ASSERT(0);
1176                 }
1177                 /*
1178                  * now read it
1179                  */
1180                 if(!stream_decoder_read_subframe_(decoder, channel, bps))
1181                         return false;
1182                 if(decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME) {
1183                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1184                         return true;
1185                 }
1186         }
1187         if(!stream_decoder_read_zero_padding_(decoder))
1188                 return false;
1189
1190         /*
1191          * Read the frame CRC-16 from the footer and check
1192          */
1193         frame_crc = FLAC__bitbuffer_get_read_crc16(decoder->private_->input);
1194         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN, read_callback_, decoder))
1195                 return false; /* the read_callback_ sets the state for us */
1196         if(frame_crc == (FLAC__uint16)x) {
1197                 /* Undo any special channel coding */
1198                 switch(decoder->private_->frame.header.channel_assignment) {
1199                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1200                                 /* do nothing */
1201                                 break;
1202                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1203                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1204                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1205                                         decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i];
1206                                 break;
1207                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1208                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1209                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1210                                         decoder->private_->output[0][i] += decoder->private_->output[1][i];
1211                                 break;
1212                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1213                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1214                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
1215                                         mid = decoder->private_->output[0][i];
1216                                         side = decoder->private_->output[1][i];
1217                                         mid <<= 1;
1218                                         if(side & 1) /* i.e. if 'side' is odd... */
1219                                                 mid++;
1220                                         left = mid + side;
1221                                         right = mid - side;
1222                                         decoder->private_->output[0][i] = left >> 1;
1223                                         decoder->private_->output[1][i] = right >> 1;
1224                                 }
1225                                 break;
1226                         default:
1227                                 FLAC__ASSERT(0);
1228                                 break;
1229                 }
1230         }
1231         else {
1232                 /* Bad frame, emit error and zero the output signal */
1233                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH, decoder->private_->client_data);
1234                 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
1235                         memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
1236                 }
1237         }
1238
1239         *got_a_frame = true;
1240
1241         /* put the latest values into the public section of the decoder instance */
1242         decoder->protected_->channels = decoder->private_->frame.header.channels;
1243         decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment;
1244         decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample;
1245         decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate;
1246         decoder->protected_->blocksize = decoder->private_->frame.header.blocksize;
1247
1248         FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
1249         decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize;
1250
1251         /* write it */
1252         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)
1253                 return false;
1254
1255         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1256         return true;
1257 }
1258
1259 FLAC__bool stream_decoder_read_frame_header_(FLAC__StreamDecoder *decoder)
1260 {
1261         FLAC__uint32 x;
1262         FLAC__uint64 xx;
1263         unsigned i, blocksize_hint = 0, sample_rate_hint = 0;
1264         FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */
1265         unsigned raw_header_len;
1266         FLAC__bool is_unparseable = false;
1267         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);
1268         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);
1269
1270         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
1271
1272         /* init the raw header with the saved bits from synchronization */
1273         raw_header[0] = decoder->private_->header_warmup[0];
1274         raw_header[1] = decoder->private_->header_warmup[1];
1275         raw_header_len = 2;
1276
1277         /*
1278          * check to make sure that the reserved bits are 0
1279          */
1280         if(raw_header[1] & 0x03) { /* MAGIC NUMBER */
1281                 is_unparseable = true;
1282         }
1283
1284         /*
1285          * Note that along the way as we read the header, we look for a sync
1286          * code inside.  If we find one it would indicate that our original
1287          * sync was bad since there cannot be a sync code in a valid header.
1288          */
1289
1290         /*
1291          * read in the raw header as bytes so we can CRC it, and parse it on the way
1292          */
1293         for(i = 0; i < 2; i++) {
1294                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1295                         return false; /* the read_callback_ sets the state for us */
1296                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1297                         /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */
1298                         decoder->private_->lookahead = (FLAC__byte)x;
1299                         decoder->private_->cached = true;
1300                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1301                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1302                         return true;
1303                 }
1304                 raw_header[raw_header_len++] = (FLAC__byte)x;
1305         }
1306
1307         switch(x = raw_header[2] >> 4) {
1308                 case 0:
1309                         if(is_known_fixed_blocksize_stream)
1310                                 decoder->private_->frame.header.blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize;
1311                         else
1312                                 is_unparseable = true;
1313                         break;
1314                 case 1:
1315                         decoder->private_->frame.header.blocksize = 192;
1316                         break;
1317                 case 2:
1318                 case 3:
1319                 case 4:
1320                 case 5:
1321                         decoder->private_->frame.header.blocksize = 576 << (x-2);
1322                         break;
1323                 case 6:
1324                 case 7:
1325                         blocksize_hint = x;
1326                         break;
1327                 case 8:
1328                 case 9:
1329                 case 10:
1330                 case 11:
1331                 case 12:
1332                 case 13:
1333                 case 14:
1334                 case 15:
1335                         decoder->private_->frame.header.blocksize = 256 << (x-8);
1336                         break;
1337                 default:
1338                         FLAC__ASSERT(0);
1339                         break;
1340         }
1341
1342         switch(x = raw_header[2] & 0x0f) {
1343                 case 0:
1344                         if(decoder->private_->has_stream_info)
1345                                 decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate;
1346                         else
1347                                 is_unparseable = true;
1348                         break;
1349                 case 1:
1350                 case 2:
1351                 case 3:
1352                         is_unparseable = true;
1353                         break;
1354                 case 4:
1355                         decoder->private_->frame.header.sample_rate = 8000;
1356                         break;
1357                 case 5:
1358                         decoder->private_->frame.header.sample_rate = 16000;
1359                         break;
1360                 case 6:
1361                         decoder->private_->frame.header.sample_rate = 22050;
1362                         break;
1363                 case 7:
1364                         decoder->private_->frame.header.sample_rate = 24000;
1365                         break;
1366                 case 8:
1367                         decoder->private_->frame.header.sample_rate = 32000;
1368                         break;
1369                 case 9:
1370                         decoder->private_->frame.header.sample_rate = 44100;
1371                         break;
1372                 case 10:
1373                         decoder->private_->frame.header.sample_rate = 48000;
1374                         break;
1375                 case 11:
1376                         decoder->private_->frame.header.sample_rate = 96000;
1377                         break;
1378                 case 12:
1379                 case 13:
1380                 case 14:
1381                         sample_rate_hint = x;
1382                         break;
1383                 case 15:
1384                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1385                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1386                         return true;
1387                 default:
1388                         FLAC__ASSERT(0);
1389         }
1390
1391         x = (unsigned)(raw_header[3] >> 4);
1392         if(x & 8) {
1393                 decoder->private_->frame.header.channels = 2;
1394                 switch(x & 7) {
1395                         case 0:
1396                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE;
1397                                 break;
1398                         case 1:
1399                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE;
1400                                 break;
1401                         case 2:
1402                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE;
1403                                 break;
1404                         default:
1405                                 is_unparseable = true;
1406                                 break;
1407                 }
1408         }
1409         else {
1410                 decoder->private_->frame.header.channels = (unsigned)x + 1;
1411                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT;
1412         }
1413
1414         switch(x = (unsigned)(raw_header[3] & 0x0e) >> 1) {
1415                 case 0:
1416                         if(decoder->private_->has_stream_info)
1417                                 decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample;
1418                         else
1419                                 is_unparseable = true;
1420                         break;
1421                 case 1:
1422                         decoder->private_->frame.header.bits_per_sample = 8;
1423                         break;
1424                 case 2:
1425                         decoder->private_->frame.header.bits_per_sample = 12;
1426                         break;
1427                 case 4:
1428                         decoder->private_->frame.header.bits_per_sample = 16;
1429                         break;
1430                 case 5:
1431                         decoder->private_->frame.header.bits_per_sample = 20;
1432                         break;
1433                 case 6:
1434                         decoder->private_->frame.header.bits_per_sample = 24;
1435                         break;
1436                 case 3:
1437                 case 7:
1438                         is_unparseable = true;
1439                         break;
1440                 default:
1441                         FLAC__ASSERT(0);
1442                         break;
1443         }
1444
1445         if(raw_header[3] & 0x01) { /* this should be a zero padding bit */
1446                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1447                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1448                 return true;
1449         }
1450
1451         if(blocksize_hint && is_known_variable_blocksize_stream) {
1452                 if(!FLAC__bitbuffer_read_utf8_uint64(decoder->private_->input, &xx, read_callback_, decoder, raw_header, &raw_header_len))
1453                         return false; /* the read_callback_ sets the state for us */
1454                 if(xx == 0xffffffffffffffff) { /* i.e. non-UTF8 code... */
1455                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
1456                         decoder->private_->cached = true;
1457                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1458                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1459                         return true;
1460                 }
1461                 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
1462                 decoder->private_->frame.header.number.sample_number = xx;
1463         }
1464         else {
1465                 if(!FLAC__bitbuffer_read_utf8_uint32(decoder->private_->input, &x, read_callback_, decoder, raw_header, &raw_header_len))
1466                         return false; /* the read_callback_ sets the state for us */
1467                 if(x == 0xffffffff) { /* i.e. non-UTF8 code... */
1468                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
1469                         decoder->private_->cached = true;
1470                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1471                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1472                         return true;
1473                 }
1474                 decoder->private_->last_frame_number = x;
1475                 if(decoder->private_->has_stream_info) {
1476                         decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
1477                         decoder->private_->frame.header.number.sample_number = (FLAC__int64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__int64)x;
1478                 }
1479                 else {
1480                         is_unparseable = true;
1481                 }
1482         }
1483
1484         if(blocksize_hint) {
1485                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1486                         return false; /* the read_callback_ sets the state for us */
1487                 raw_header[raw_header_len++] = (FLAC__byte)x;
1488                 if(blocksize_hint == 7) {
1489                         FLAC__uint32 _x;
1490                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &_x, 8, read_callback_, decoder))
1491                                 return false; /* the read_callback_ sets the state for us */
1492                         raw_header[raw_header_len++] = (FLAC__byte)_x;
1493                         x = (x << 8) | _x;
1494                 }
1495                 decoder->private_->frame.header.blocksize = x+1;
1496         }
1497
1498         if(sample_rate_hint) {
1499                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1500                         return false; /* the read_callback_ sets the state for us */
1501                 raw_header[raw_header_len++] = (FLAC__byte)x;
1502                 if(sample_rate_hint != 12) {
1503                         FLAC__uint32 _x;
1504                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &_x, 8, read_callback_, decoder))
1505                                 return false; /* the read_callback_ sets the state for us */
1506                         raw_header[raw_header_len++] = (FLAC__byte)_x;
1507                         x = (x << 8) | _x;
1508                 }
1509                 if(sample_rate_hint == 12)
1510                         decoder->private_->frame.header.sample_rate = x*1000;
1511                 else if(sample_rate_hint == 13)
1512                         decoder->private_->frame.header.sample_rate = x;
1513                 else
1514                         decoder->private_->frame.header.sample_rate = x*10;
1515         }
1516
1517         /* read the CRC-8 byte */
1518         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1519                 return false; /* the read_callback_ sets the state for us */
1520         crc8 = (FLAC__byte)x;
1521
1522         if(FLAC__crc8(raw_header, raw_header_len) != crc8) {
1523                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1524                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1525                 return true;
1526         }
1527
1528         if(is_unparseable) {
1529                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1530                 return false;
1531         }
1532
1533         return true;
1534 }
1535
1536 FLAC__bool stream_decoder_read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1537 {
1538         FLAC__uint32 x;
1539         FLAC__bool wasted_bits;
1540
1541         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder)) /* MAGIC NUMBER */
1542                 return false; /* the read_callback_ sets the state for us */
1543
1544         wasted_bits = (x & 1);
1545         x &= 0xfe;
1546
1547         if(wasted_bits) {
1548                 unsigned u;
1549                 if(!FLAC__bitbuffer_read_unary_unsigned(decoder->private_->input, &u, read_callback_, decoder))
1550                         return false; /* the read_callback_ sets the state for us */
1551                 decoder->private_->frame.subframes[channel].wasted_bits = u+1;
1552                 bps -= decoder->private_->frame.subframes[channel].wasted_bits;
1553         }
1554         else
1555                 decoder->private_->frame.subframes[channel].wasted_bits = 0;
1556
1557         /*
1558          * Lots of magic numbers here
1559          */
1560         if(x & 0x80) {
1561                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1562                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1563                 return true;
1564         }
1565         else if(x == 0) {
1566                 if(!stream_decoder_read_subframe_constant_(decoder, channel, bps))
1567                         return false;
1568         }
1569         else if(x == 2) {
1570                 if(!stream_decoder_read_subframe_verbatim_(decoder, channel, bps))
1571                         return false;
1572         }
1573         else if(x < 16) {
1574                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1575                 return false;
1576         }
1577         else if(x <= 24) {
1578                 if(!stream_decoder_read_subframe_fixed_(decoder, channel, bps, (x>>1)&7))
1579                         return false;
1580         }
1581         else if(x < 64) {
1582                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1583                 return false;
1584         }
1585         else {
1586                 if(!stream_decoder_read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1))
1587                         return false;
1588         }
1589
1590         if(wasted_bits) {
1591                 unsigned i;
1592                 x = decoder->private_->frame.subframes[channel].wasted_bits;
1593                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1594                         decoder->private_->output[channel][i] <<= x;
1595         }
1596
1597         return true;
1598 }
1599
1600 FLAC__bool stream_decoder_read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1601 {
1602         FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant;
1603         FLAC__int32 x;
1604         unsigned i;
1605         FLAC__int32 *output = decoder->private_->output[channel];
1606
1607         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT;
1608
1609         if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &x, bps, read_callback_, decoder))
1610                 return false; /* the read_callback_ sets the state for us */
1611
1612         subframe->value = x;
1613
1614         /* decode the subframe */
1615         for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1616                 output[i] = x;
1617
1618         return true;
1619 }
1620
1621 FLAC__bool stream_decoder_read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order)
1622 {
1623         FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed;
1624         FLAC__int32 i32;
1625         FLAC__uint32 u32;
1626         unsigned u;
1627
1628         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED;
1629
1630         subframe->residual = decoder->private_->residual[channel];
1631         subframe->order = order;
1632
1633         /* read warm-up samples */
1634         for(u = 0; u < order; u++) {
1635                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, bps, read_callback_, decoder))
1636                         return false; /* the read_callback_ sets the state for us */
1637                 subframe->warmup[u] = i32;
1638         }
1639
1640         /* read entropy coding method info */
1641         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder))
1642                 return false; /* the read_callback_ sets the state for us */
1643         subframe->entropy_coding_method.type = u32;
1644         switch(subframe->entropy_coding_method.type) {
1645                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1646                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder))
1647                                 return false; /* the read_callback_ sets the state for us */
1648                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
1649                         break;
1650                 default:
1651                         decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1652                         return false;
1653         }
1654
1655         /* read residual */
1656         switch(subframe->entropy_coding_method.type) {
1657                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1658                         if(!stream_decoder_read_residual_partitioned_rice_(decoder, order, &subframe->entropy_coding_method.data.partitioned_rice, decoder->private_->residual[channel]))
1659                                 return false;
1660                         break;
1661                 default:
1662                         FLAC__ASSERT(0);
1663         }
1664
1665         /* decode the subframe */
1666         memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
1667         FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order);
1668
1669         return true;
1670 }
1671
1672 FLAC__bool stream_decoder_read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order)
1673 {
1674         FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc;
1675         FLAC__int32 i32;
1676         FLAC__uint32 u32;
1677         unsigned u;
1678
1679         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC;
1680
1681         subframe->residual = decoder->private_->residual[channel];
1682         subframe->order = order;
1683
1684         /* read warm-up samples */
1685         for(u = 0; u < order; u++) {
1686                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, bps, read_callback_, decoder))
1687                         return false; /* the read_callback_ sets the state for us */
1688                 subframe->warmup[u] = i32;
1689         }
1690
1691         /* read qlp coeff precision */
1692         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN, read_callback_, decoder))
1693                 return false; /* the read_callback_ sets the state for us */
1694         if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) {
1695                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1696                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1697                 return true;
1698         }
1699         subframe->qlp_coeff_precision = u32+1;
1700
1701         /* read qlp shift */
1702         if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN, read_callback_, decoder))
1703                 return false; /* the read_callback_ sets the state for us */
1704         subframe->quantization_level = i32;
1705
1706         /* read quantized lp coefficiencts */
1707         for(u = 0; u < order; u++) {
1708                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision, read_callback_, decoder))
1709                         return false; /* the read_callback_ sets the state for us */
1710                 subframe->qlp_coeff[u] = i32;
1711         }
1712
1713         /* read entropy coding method info */
1714         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder))
1715                 return false; /* the read_callback_ sets the state for us */
1716         subframe->entropy_coding_method.type = u32;
1717         switch(subframe->entropy_coding_method.type) {
1718                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1719                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder))
1720                                 return false; /* the read_callback_ sets the state for us */
1721                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
1722                         break;
1723                 default:
1724                         decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1725                         return false;
1726         }
1727
1728         /* read residual */
1729         switch(subframe->entropy_coding_method.type) {
1730                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1731                         if(!stream_decoder_read_residual_partitioned_rice_(decoder, order, &subframe->entropy_coding_method.data.partitioned_rice, decoder->private_->residual[channel]))
1732                                 return false;
1733                         break;
1734                 default:
1735                         FLAC__ASSERT(0);
1736         }
1737
1738         /* decode the subframe */
1739         memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
1740         if(bps <= 16 && subframe->qlp_coeff_precision <= 16)
1741                 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);
1742         else
1743                 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);
1744
1745         return true;
1746 }
1747
1748 FLAC__bool stream_decoder_read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1749 {
1750         FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim;
1751         FLAC__int32 x, *residual = decoder->private_->residual[channel];
1752         unsigned i;
1753
1754         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM;
1755
1756         subframe->data = residual;
1757
1758         for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
1759                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &x, bps, read_callback_, decoder))
1760                         return false; /* the read_callback_ sets the state for us */
1761                 residual[i] = x;
1762         }
1763
1764         /* decode the subframe */
1765         memcpy(decoder->private_->output[channel], subframe->data, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
1766
1767         return true;
1768 }
1769
1770 FLAC__bool stream_decoder_read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, FLAC__EntropyCodingMethod_PartitionedRice *partitioned_rice, FLAC__int32 *residual)
1771 {
1772         FLAC__uint32 rice_parameter;
1773         int i;
1774         unsigned partition, sample, u;
1775         const unsigned partition_order = partitioned_rice->order;
1776         const unsigned partitions = 1u << partition_order;
1777         const unsigned partition_samples = partition_order > 0? decoder->private_->frame.header.blocksize >> partition_order : decoder->private_->frame.header.blocksize - predictor_order;
1778
1779         sample = 0;
1780         for(partition = 0; partition < partitions; partition++) {
1781                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN, read_callback_, decoder))
1782                         return false; /* the read_callback_ sets the state for us */
1783                 partitioned_rice->parameters[partition] = rice_parameter;
1784                 if(rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1785 #ifdef FLAC__SYMMETRIC_RICE
1786                         for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
1787                                 if(!FLAC__bitbuffer_read_symmetric_rice_signed(decoder->private_->input, &i, rice_parameter, read_callback_, decoder))
1788                                         return false; /* the read_callback_ sets the state for us */
1789                                 residual[sample] = i;
1790                         }
1791 #else
1792                         u = (partition_order == 0 || partition > 0)? partition_samples : partition_samples - predictor_order;
1793                         if(!FLAC__bitbuffer_read_rice_signed_block(decoder->private_->input, residual + sample, u, rice_parameter, read_callback_, decoder))
1794                                 return false; /* the read_callback_ sets the state for us */
1795                         sample += u;
1796 #endif
1797                 }
1798                 else {
1799                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN, read_callback_, decoder))
1800                                 return false; /* the read_callback_ sets the state for us */
1801                         partitioned_rice->raw_bits[partition] = rice_parameter;
1802                         for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
1803                                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i, rice_parameter, read_callback_, decoder))
1804                                         return false; /* the read_callback_ sets the state for us */
1805                                 residual[sample] = i;
1806                         }
1807                 }
1808         }
1809
1810         return true;
1811 }
1812
1813 FLAC__bool stream_decoder_read_zero_padding_(FLAC__StreamDecoder *decoder)
1814 {
1815         if(!FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input)) {
1816                 FLAC__uint32 zero = 0;
1817                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &zero, FLAC__bitbuffer_bits_left_for_byte_alignment(decoder->private_->input), read_callback_, decoder))
1818                         return false; /* the read_callback_ sets the state for us */
1819                 if(zero != 0) {
1820                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1821                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1822                 }
1823         }
1824         return true;
1825 }
1826
1827 FLAC__bool read_callback_(FLAC__byte buffer[], unsigned *bytes, void *client_data)
1828 {
1829         FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data;
1830         FLAC__StreamDecoderReadStatus status;
1831
1832         status = decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data);
1833         if(status == FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM)
1834                 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1835         else if(status == FLAC__STREAM_DECODER_READ_STATUS_ABORT)
1836                 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
1837         return status == FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
1838 }