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/bitmath.h"
  27 #include "private/cpu.h"
  28 #include "private/crc.h"
  29 #include "private/fixed.h"
  30 #include "private/format.h"
  31 #include "private/lpc.h"
  32
  33 #ifdef max
  34 #undef max
  35 #endif
  36 #define max(a,b) ((a)>(b)?(a):(b))
  37
  38 /***********************************************************************
  39  *
  40  * Private static data
  41  *
  42  ***********************************************************************/
  43
  44 static FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' };
  45
  46 /***********************************************************************
  47  *
  48  * Private class method prototypes
  49  *
  50  ***********************************************************************/
  51
  52 static void set_defaults_(FLAC__StreamDecoder *decoder);
  53 static FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels);
  54 static FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id);
  55 static FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder);
  56 static FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder);
  57 static FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length);
  58 static FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length);
  59 static FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj);
  60 static FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder);
  61 static FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder);
  62 static FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame);
  63 static FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder);
  64 static FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  65 static FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  66 static FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order);
  67 static FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order);
  68 static FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  69 static FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, unsigned partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual);
  70 static FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder);
  71 static FLAC__bool read_callback_(FLAC__byte buffer[], unsigned *bytes, void *client_data);
  72
  73 /***********************************************************************
  74  *
  75  * Private class data
  76  *
  77  ***********************************************************************/
  78
  79 typedef struct FLAC__StreamDecoderPrivate {
  80         FLAC__StreamDecoderReadCallback read_callback;
  81         FLAC__StreamDecoderWriteCallback write_callback;
  82         FLAC__StreamDecoderMetadataCallback metadata_callback;
  83         FLAC__StreamDecoderErrorCallback error_callback;
  84         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[]);
  85         void (*local_lpc_restore_signal_64bit)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
  86         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[]);
  87         void *client_data;
  88         FLAC__BitBuffer *input;
  89         FLAC__int32 *output[FLAC__MAX_CHANNELS];
  90         FLAC__int32 *residual[FLAC__MAX_CHANNELS];
  91         FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents[FLAC__MAX_CHANNELS];
  92         unsigned output_capacity, output_channels;
  93         FLAC__uint32 last_frame_number;
  94         FLAC__uint64 samples_decoded;
  95         FLAC__bool has_stream_info, has_seek_table;
  96         FLAC__StreamMetadata stream_info;
  97         FLAC__StreamMetadata seek_table;
  98         FLAC__bool metadata_filter[FLAC__METADATA_TYPE_VORBIS_COMMENT+1];
  99         FLAC__byte *metadata_filter_ids;
 100         unsigned metadata_filter_ids_count, metadata_filter_ids_capacity; /* units for both are IDs, not bytes */
 101         FLAC__Frame frame;
 102         FLAC__bool cached; /* true if there is a byte in lookahead */
 103         FLAC__CPUInfo cpuinfo;
 104         FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */
 105         FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */
 106 } FLAC__StreamDecoderPrivate;
 107
 108 /***********************************************************************
 109  *
 110  * Public static class data
 111  *
 112  ***********************************************************************/
 113
 114 FLAC_API const char * const FLAC__StreamDecoderStateString[] = {
 115         "FLAC__STREAM_DECODER_SEARCH_FOR_METADATA",
 116         "FLAC__STREAM_DECODER_READ_METADATA",
 117         "FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC",
 118         "FLAC__STREAM_DECODER_READ_FRAME",
 119         "FLAC__STREAM_DECODER_END_OF_STREAM",
 120         "FLAC__STREAM_DECODER_ABORTED",
 121         "FLAC__STREAM_DECODER_UNPARSEABLE_STREAM",
 122         "FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR",
 123         "FLAC__STREAM_DECODER_ALREADY_INITIALIZED",
 124         "FLAC__STREAM_DECODER_INVALID_CALLBACK",
 125         "FLAC__STREAM_DECODER_UNINITIALIZED"
 126 };
 127
 128 FLAC_API const char * const FLAC__StreamDecoderReadStatusString[] = {
 129         "FLAC__STREAM_DECODER_READ_STATUS_CONTINUE",
 130         "FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM",
 131         "FLAC__STREAM_DECODER_READ_STATUS_ABORT"
 132 };
 133
 134 FLAC_API const char * const FLAC__StreamDecoderWriteStatusString[] = {
 135         "FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE",
 136         "FLAC__STREAM_DECODER_WRITE_STATUS_ABORT"
 137 };
 138
 139 FLAC_API const char * const FLAC__StreamDecoderErrorStatusString[] = {
 140         "FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC",
 141         "FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER",
 142         "FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH"
 143 };
 144
 145 /***********************************************************************
 146  *
 147  * Class constructor/destructor
 148  *
 149  ***********************************************************************/
 150 FLAC_API FLAC__StreamDecoder *FLAC__stream_decoder_new()
 151 {
 152         FLAC__StreamDecoder *decoder;
 153         unsigned i;
 154
 155         FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
 156
 157         decoder = (FLAC__StreamDecoder*)calloc(1, sizeof(FLAC__StreamDecoder));
 158         if(decoder == 0) {
 159                 return 0;
 160         }
 161
 162         decoder->protected_ = (FLAC__StreamDecoderProtected*)calloc(1, sizeof(FLAC__StreamDecoderProtected));
 163         if(decoder->protected_ == 0) {
 164                 free(decoder);
 165                 return 0;
 166         }
 167
 168         decoder->private_ = (FLAC__StreamDecoderPrivate*)calloc(1, sizeof(FLAC__StreamDecoderPrivate));
 169         if(decoder->private_ == 0) {
 170                 free(decoder->protected_);
 171                 free(decoder);
 172                 return 0;
 173         }
 174
 175         decoder->private_->input = FLAC__bitbuffer_new();
 176         if(decoder->private_->input == 0) {
 177                 free(decoder->private_);
 178                 free(decoder->protected_);
 179                 free(decoder);
 180                 return 0;
 181         }
 182
 183         decoder->private_->metadata_filter_ids_capacity = 16;
 184         if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)malloc((FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) * decoder->private_->metadata_filter_ids_capacity))) {
 185                 FLAC__bitbuffer_delete(decoder->private_->input);
 186                 free(decoder->private_);
 187                 free(decoder->protected_);
 188                 free(decoder);
 189                 return 0;
 190         }
 191
 192         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 193                 decoder->private_->output[i] = 0;
 194                 decoder->private_->residual[i] = 0;
 195         }
 196
 197         decoder->private_->output_capacity = 0;
 198         decoder->private_->output_channels = 0;
 199         decoder->private_->has_seek_table = false;
 200
 201         for(i = 0; i < FLAC__MAX_CHANNELS; i++)
 202                 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&decoder->private_->partitioned_rice_contents[i]);
 203
 204         set_defaults_(decoder);
 205
 206         decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
 207
 208         return decoder;
 209 }
 210
 211 FLAC_API void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder)
 212 {
 213         unsigned i;
 214
 215         FLAC__ASSERT(0 != decoder);
 216         FLAC__ASSERT(0 != decoder->protected_);
 217         FLAC__ASSERT(0 != decoder->private_);
 218         FLAC__ASSERT(0 != decoder->private_->input);
 219
 220         FLAC__stream_decoder_finish(decoder);
 221
 222         if(0 != decoder->private_->metadata_filter_ids)
 223                 free(decoder->private_->metadata_filter_ids);
 224
 225         FLAC__bitbuffer_delete(decoder->private_->input);
 226
 227         for(i = 0; i < FLAC__MAX_CHANNELS; i++)
 228                 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&decoder->private_->partitioned_rice_contents[i]);
 229
 230         free(decoder->private_);
 231         free(decoder->protected_);
 232         free(decoder);
 233 }
 234
 235 /***********************************************************************
 236  *
 237  * Public class methods
 238  *
 239  ***********************************************************************/
 240
 241 FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_init(FLAC__StreamDecoder *decoder)
 242 {
 243         FLAC__ASSERT(0 != decoder);
 244
 245         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 246                 return decoder->protected_->state = FLAC__STREAM_DECODER_ALREADY_INITIALIZED;
 247
 248         if(0 == decoder->private_->read_callback || 0 == decoder->private_->write_callback || 0 == decoder->private_->metadata_callback || 0 == decoder->private_->error_callback)
 249                 return decoder->protected_->state = FLAC__STREAM_DECODER_INVALID_CALLBACK;
 250
 251         if(!FLAC__bitbuffer_init(decoder->private_->input))
 252                 return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 253
 254         decoder->private_->last_frame_number = 0;
 255         decoder->private_->samples_decoded = 0;
 256         decoder->private_->has_stream_info = false;
 257         decoder->private_->cached = false;
 258
 259         /*
 260          * get the CPU info and set the function pointers
 261          */
 262         FLAC__cpu_info(&decoder->private_->cpuinfo);
 263         /* first default to the non-asm routines */
 264         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal;
 265         decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide;
 266         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal;
 267         /* now override with asm where appropriate */
 268 #ifndef FLAC__NO_ASM
 269         if(decoder->private_->cpuinfo.use_asm) {
 270 #ifdef FLAC__CPU_IA32
 271                 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
 272 #ifdef FLAC__HAS_NASM
 273                 if(decoder->private_->cpuinfo.data.ia32.mmx) {
 274                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
 275                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32_mmx;
 276                 }
 277                 else {
 278                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
 279                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32;
 280                 }
 281 #endif
 282 #endif
 283         }
 284 #endif
 285
 286         if(!FLAC__stream_decoder_reset(decoder))
 287                 return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 288
 289         return decoder->protected_->state;
 290 }
 291
 292 FLAC_API void FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder)
 293 {
 294         unsigned i;
 295         FLAC__ASSERT(0 != decoder);
 296         if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
 297                 return;
 298         if(decoder->private_->has_seek_table) {
 299                 FLAC__ASSERT(0 != decoder->private_->seek_table.data.seek_table.points);
 300                 free(decoder->private_->seek_table.data.seek_table.points);
 301                 decoder->private_->seek_table.data.seek_table.points = 0;
 302                 decoder->private_->has_seek_table = false;
 303         }
 304         FLAC__bitbuffer_free(decoder->private_->input);
 305         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 306                 /* WATCHOUT:
 307                  * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the
 308                  * output arrays have a buffer of up to 3 zeroes in front
 309                  * (at negative indices) for alignment purposes; we use 4
 310                  * to keep the data well-aligned.
 311                  */
 312                 if(0 != decoder->private_->output[i]) {
 313                         free(decoder->private_->output[i]-4);
 314                         decoder->private_->output[i] = 0;
 315                 }
 316                 if(0 != decoder->private_->residual[i]) {
 317                         free(decoder->private_->residual[i]);
 318                         decoder->private_->residual[i] = 0;
 319                 }
 320         }
 321         decoder->private_->output_capacity = 0;
 322         decoder->private_->output_channels = 0;
 323
 324         set_defaults_(decoder);
 325
 326         decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
 327 }
 328
 329 FLAC_API FLAC__bool FLAC__stream_decoder_set_read_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderReadCallback value)
 330 {
 331         FLAC__ASSERT(0 != decoder);
 332         FLAC__ASSERT(0 != decoder->private_);
 333         FLAC__ASSERT(0 != decoder->protected_);
 334         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 335                 return false;
 336         decoder->private_->read_callback = value;
 337         return true;
 338 }
 339
 340 FLAC_API FLAC__bool FLAC__stream_decoder_set_write_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderWriteCallback value)
 341 {
 342         FLAC__ASSERT(0 != decoder);
 343         FLAC__ASSERT(0 != decoder->private_);
 344         FLAC__ASSERT(0 != decoder->protected_);
 345         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 346                 return false;
 347         decoder->private_->write_callback = value;
 348         return true;
 349 }
 350
 351 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderMetadataCallback value)
 352 {
 353         FLAC__ASSERT(0 != decoder);
 354         FLAC__ASSERT(0 != decoder->private_);
 355         FLAC__ASSERT(0 != decoder->protected_);
 356         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 357                 return false;
 358         decoder->private_->metadata_callback = value;
 359         return true;
 360 }
 361
 362 FLAC_API FLAC__bool FLAC__stream_decoder_set_error_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorCallback value)
 363 {
 364         FLAC__ASSERT(0 != decoder);
 365         FLAC__ASSERT(0 != decoder->private_);
 366         FLAC__ASSERT(0 != decoder->protected_);
 367         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 368                 return false;
 369         decoder->private_->error_callback = value;
 370         return true;
 371 }
 372
 373 FLAC_API FLAC__bool FLAC__stream_decoder_set_client_data(FLAC__StreamDecoder *decoder, void *value)
 374 {
 375         FLAC__ASSERT(0 != decoder);
 376         FLAC__ASSERT(0 != decoder->private_);
 377         FLAC__ASSERT(0 != decoder->protected_);
 378         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 379                 return false;
 380         decoder->private_->client_data = value;
 381         return true;
 382 }
 383
 384 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
 385 {
 386         FLAC__ASSERT(0 != decoder);
 387         FLAC__ASSERT(0 != decoder->private_);
 388         FLAC__ASSERT(0 != decoder->protected_);
 389         FLAC__ASSERT(type <= FLAC__METADATA_TYPE_VORBIS_COMMENT);
 390         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 391                 return false;
 392         decoder->private_->metadata_filter[type] = true;
 393         if(type == FLAC__METADATA_TYPE_APPLICATION)
 394                 decoder->private_->metadata_filter_ids_count = 0;
 395         return true;
 396 }
 397
 398 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
 399 {
 400         FLAC__ASSERT(0 != decoder);
 401         FLAC__ASSERT(0 != decoder->private_);
 402         FLAC__ASSERT(0 != decoder->protected_);
 403         FLAC__ASSERT(0 != id);
 404         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 405                 return false;
 406
 407         if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
 408                 return true;
 409
 410         FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
 411
 412         if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
 413                 if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2)))
 414                         return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 415                 decoder->private_->metadata_filter_ids_capacity *= 2;
 416         }
 417
 418         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));
 419         decoder->private_->metadata_filter_ids_count++;
 420
 421         return true;
 422 }
 423
 424 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder)
 425 {
 426         unsigned i;
 427         FLAC__ASSERT(0 != decoder);
 428         FLAC__ASSERT(0 != decoder->private_);
 429         FLAC__ASSERT(0 != decoder->protected_);
 430         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 431                 return false;
 432         for(i = 0; i < sizeof(decoder->private_->metadata_filter) / sizeof(decoder->private_->metadata_filter[0]); i++)
 433                 decoder->private_->metadata_filter[i] = true;
 434         decoder->private_->metadata_filter_ids_count = 0;
 435         return true;
 436 }
 437
 438 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
 439 {
 440         FLAC__ASSERT(0 != decoder);
 441         FLAC__ASSERT(0 != decoder->private_);
 442         FLAC__ASSERT(0 != decoder->protected_);
 443         FLAC__ASSERT(type <= FLAC__METADATA_TYPE_VORBIS_COMMENT);
 444         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 445                 return false;
 446         decoder->private_->metadata_filter[type] = false;
 447         if(type == FLAC__METADATA_TYPE_APPLICATION)
 448                 decoder->private_->metadata_filter_ids_count = 0;
 449         return true;
 450 }
 451
 452 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
 453 {
 454         FLAC__ASSERT(0 != decoder);
 455         FLAC__ASSERT(0 != decoder->private_);
 456         FLAC__ASSERT(0 != decoder->protected_);
 457         FLAC__ASSERT(0 != id);
 458         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 459                 return false;
 460
 461         if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
 462                 return true;
 463
 464         FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
 465
 466         if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
 467                 if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2)))
 468                         return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 469                 decoder->private_->metadata_filter_ids_capacity *= 2;
 470         }
 471
 472         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));
 473         decoder->private_->metadata_filter_ids_count++;
 474
 475         return true;
 476 }
 477
 478 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder)
 479 {
 480         FLAC__ASSERT(0 != decoder);
 481         FLAC__ASSERT(0 != decoder->private_);
 482         FLAC__ASSERT(0 != decoder->protected_);
 483         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 484                 return false;
 485         memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
 486         decoder->private_->metadata_filter_ids_count = 0;
 487         return true;
 488 }
 489
 490 FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder)
 491 {
 492         FLAC__ASSERT(0 != decoder);
 493         FLAC__ASSERT(0 != decoder->protected_);
 494         return decoder->protected_->state;
 495 }
 496
 497 FLAC_API unsigned FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder)
 498 {
 499         FLAC__ASSERT(0 != decoder);
 500         FLAC__ASSERT(0 != decoder->protected_);
 501         return decoder->protected_->channels;
 502 }
 503
 504 FLAC_API FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder)
 505 {
 506         FLAC__ASSERT(0 != decoder);
 507         FLAC__ASSERT(0 != decoder->protected_);
 508         return decoder->protected_->channel_assignment;
 509 }
 510
 511 FLAC_API unsigned FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder)
 512 {
 513         FLAC__ASSERT(0 != decoder);
 514         FLAC__ASSERT(0 != decoder->protected_);
 515         return decoder->protected_->bits_per_sample;
 516 }
 517
 518 FLAC_API unsigned FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder)
 519 {
 520         FLAC__ASSERT(0 != decoder);
 521         FLAC__ASSERT(0 != decoder->protected_);
 522         return decoder->protected_->sample_rate;
 523 }
 524
 525 FLAC_API unsigned FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder)
 526 {
 527         FLAC__ASSERT(0 != decoder);
 528         FLAC__ASSERT(0 != decoder->protected_);
 529         return decoder->protected_->blocksize;
 530 }
 531
 532 FLAC_API FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder)
 533 {
 534         FLAC__ASSERT(0 != decoder);
 535         FLAC__ASSERT(0 != decoder->private_);
 536         FLAC__ASSERT(0 != decoder->protected_);
 537
 538         if(!FLAC__bitbuffer_clear(decoder->private_->input)) {
 539                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 540                 return false;
 541         }
 542         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 543
 544         return true;
 545 }
 546
 547 FLAC_API FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder)
 548 {
 549         FLAC__ASSERT(0 != decoder);
 550         FLAC__ASSERT(0 != decoder->private_);
 551         FLAC__ASSERT(0 != decoder->protected_);
 552
 553         if(!FLAC__stream_decoder_flush(decoder)) {
 554                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 555                 return false;
 556         }
 557         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
 558
 559         decoder->private_->samples_decoded = 0;
 560
 561         return true;
 562 }
 563
 564 FLAC_API FLAC__bool FLAC__stream_decoder_process_single(FLAC__StreamDecoder *decoder)
 565 {
 566         FLAC__bool got_a_frame;
 567         FLAC__ASSERT(0 != decoder);
 568         FLAC__ASSERT(0 != decoder->protected_);
 569
 570         while(1) {
 571                 switch(decoder->protected_->state) {
 572                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
 573                                 if(!find_metadata_(decoder))
 574                                         return false; /* above function sets the status for us */
 575                                 break;
 576                         case FLAC__STREAM_DECODER_READ_METADATA:
 577                                 if(!read_metadata_(decoder))
 578                                         return false; /* above function sets the status for us */
 579                                 else
 580                                         return true;
 581                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 582                                 if(!frame_sync_(decoder))
 583                                         return true; /* above function sets the status for us */
 584                                 break;
 585                         case FLAC__STREAM_DECODER_READ_FRAME:
 586                                 if(!read_frame_(decoder, &got_a_frame))
 587                                         return false; /* above function sets the status for us */
 588                                 if(got_a_frame)
 589                                         return true; /* above function sets the status for us */
 590                                 break;
 591                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 592                         case FLAC__STREAM_DECODER_ABORTED:
 593                                 return true;
 594                         default:
 595                                 FLAC__ASSERT(0);
 596                                 return false;
 597                 }
 598         }
 599 }
 600
 601 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder *decoder)
 602 {
 603         FLAC__ASSERT(0 != decoder);
 604         FLAC__ASSERT(0 != decoder->protected_);
 605
 606         while(1) {
 607                 switch(decoder->protected_->state) {
 608                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
 609                                 if(!find_metadata_(decoder))
 610                                         return false; /* above function sets the status for us */
 611                                 break;
 612                         case FLAC__STREAM_DECODER_READ_METADATA:
 613                                 if(!read_metadata_(decoder))
 614                                         return false; /* above function sets the status for us */
 615                                 break;
 616                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 617                         case FLAC__STREAM_DECODER_READ_FRAME:
 618                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 619                         case FLAC__STREAM_DECODER_ABORTED:
 620                                 return true;
 621                         default:
 622                                 FLAC__ASSERT(0);
 623                                 return false;
 624                 }
 625         }
 626 }
 627
 628 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder *decoder)
 629 {
 630         FLAC__bool dummy;
 631         FLAC__ASSERT(0 != decoder);
 632         FLAC__ASSERT(0 != decoder->protected_);
 633
 634         while(1) {
 635                 switch(decoder->protected_->state) {
 636                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
 637                                 if(!find_metadata_(decoder))
 638                                         return false; /* above function sets the status for us */
 639                                 break;
 640                         case FLAC__STREAM_DECODER_READ_METADATA:
 641                                 if(!read_metadata_(decoder))
 642                                         return false; /* above function sets the status for us */
 643                                 break;
 644                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 645                                 if(!frame_sync_(decoder))
 646                                         return true; /* above function sets the status for us */
 647                                 break;
 648                         case FLAC__STREAM_DECODER_READ_FRAME:
 649                                 if(!read_frame_(decoder, &dummy))
 650                                         return false; /* above function sets the status for us */
 651                                 break;
 652                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 653                         case FLAC__STREAM_DECODER_ABORTED:
 654                                 return true;
 655                         default:
 656                                 FLAC__ASSERT(0);
 657                                 return false;
 658                 }
 659         }
 660 }
 661
 662 /***********************************************************************
 663  *
 664  * Protected class methods
 665  *
 666  ***********************************************************************/
 667
 668 unsigned FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder)
 669 {
 670         FLAC__ASSERT(0 != decoder);
 671         return FLAC__bitbuffer_get_input_bytes_unconsumed(decoder->private_->input);
 672 }
 673
 674 /***********************************************************************
 675  *
 676  * Private class methods
 677  *
 678  ***********************************************************************/
 679
 680 void set_defaults_(FLAC__StreamDecoder *decoder)
 681 {
 682         decoder->private_->read_callback = 0;
 683         decoder->private_->write_callback = 0;
 684         decoder->private_->metadata_callback = 0;
 685         decoder->private_->error_callback = 0;
 686         decoder->private_->client_data = 0;
 687
 688         memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
 689         decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] = true;
 690         decoder->private_->metadata_filter_ids_count = 0;
 691 }
 692
 693 FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels)
 694 {
 695         unsigned i;
 696         FLAC__int32 *tmp;
 697
 698         if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels)
 699                 return true;
 700
 701         /* simply using realloc() is not practical because the number of channels may change mid-stream */
 702
 703         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 704                 if(0 != decoder->private_->output[i]) {
 705                         free(decoder->private_->output[i]-4);
 706                         decoder->private_->output[i] = 0;
 707                 }
 708                 if(0 != decoder->private_->residual[i]) {
 709                         free(decoder->private_->residual[i]);
 710                         decoder->private_->residual[i] = 0;
 711                 }
 712         }
 713
 714         for(i = 0; i < channels; i++) {
 715                 /* WATCHOUT:
 716                  * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the
 717                  * output arrays have a buffer of up to 3 zeroes in front
 718                  * (at negative indices) for alignment purposes; we use 4
 719                  * to keep the data well-aligned.
 720                  */
 721                 tmp = (FLAC__int32*)malloc(sizeof(FLAC__int32)*(size+4));
 722                 if(tmp == 0) {
 723                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 724                         return false;
 725                 }
 726                 memset(tmp, 0, sizeof(FLAC__int32)*4);
 727                 decoder->private_->output[i] = tmp + 4;
 728
 729                 tmp = (FLAC__int32*)malloc(sizeof(FLAC__int32)*size);
 730                 if(tmp == 0) {
 731                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 732                         return false;
 733                 }
 734                 decoder->private_->residual[i] = tmp;
 735         }
 736
 737         decoder->private_->output_capacity = size;
 738         decoder->private_->output_channels = channels;
 739
 740         return true;
 741 }
 742
 743 FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id)
 744 {
 745         unsigned i;
 746
 747         FLAC__ASSERT(0 != decoder);
 748         FLAC__ASSERT(0 != decoder->private_);
 749
 750         for(i = 0; i < decoder->private_->metadata_filter_ids_count; i++)
 751                 if(0 == memcmp(decoder->private_->metadata_filter_ids + i * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)))
 752                         return true;
 753
 754         return false;
 755 }
 756
 757 FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder)
 758 {
 759         FLAC__uint32 x;
 760         unsigned i, id;
 761         FLAC__bool first = true;
 762
 763         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
 764
 765         for(i = id = 0; i < 4; ) {
 766                 if(decoder->private_->cached) {
 767                         x = (FLAC__uint32)decoder->private_->lookahead;
 768                         decoder->private_->cached = false;
 769                 }
 770                 else {
 771                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
 772                                 return false; /* the read_callback_ sets the state for us */
 773                 }
 774                 if(x == FLAC__STREAM_SYNC_STRING[i]) {
 775                         first = true;
 776                         i++;
 777                         id = 0;
 778                         continue;
 779                 }
 780                 if(x == ID3V2_TAG_[id]) {
 781                         id++;
 782                         i = 0;
 783                         if(id == 3) {
 784                                 if(!skip_id3v2_tag_(decoder))
 785                                         return false; /* the read_callback_ sets the state for us */
 786                         }
 787                         continue;
 788                 }
 789                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 790                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
 791                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
 792                                 return false; /* the read_callback_ sets the state for us */
 793
 794                         /* 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 */
 795                         /* else we have to check if the second byte is the end of a sync code */
 796                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 797                                 decoder->private_->lookahead = (FLAC__byte)x;
 798                                 decoder->private_->cached = true;
 799                         }
 800                         else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
 801                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
 802                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
 803                                 return true;
 804                         }
 805                 }
 806                 i = 0;
 807                 if(first) {
 808                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
 809                         first = false;
 810                 }
 811         }
 812
 813         decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA;
 814         return true;
 815 }
 816
 817 FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder)
 818 {
 819         FLAC__bool is_last;
 820         FLAC__uint32 i, x, type, length;
 821
 822         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
 823
 824         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_IS_LAST_LEN, read_callback_, decoder))
 825                 return false; /* the read_callback_ sets the state for us */
 826         is_last = x? true : false;
 827
 828         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN, read_callback_, decoder))
 829                 return false; /* the read_callback_ sets the state for us */
 830
 831         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN, read_callback_, decoder))
 832                 return false; /* the read_callback_ sets the state for us */
 833
 834         if(type == FLAC__METADATA_TYPE_STREAMINFO) {
 835                 if(!read_metadata_streaminfo_(decoder, is_last, length))
 836                         return false;
 837
 838                 decoder->private_->has_stream_info = true;
 839                 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO])
 840                         decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data);
 841         }
 842         else if(type == FLAC__METADATA_TYPE_SEEKTABLE) {
 843                 if(!read_metadata_seektable_(decoder, is_last, length))
 844                         return false;
 845
 846                 decoder->private_->has_seek_table = true;
 847                 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_SEEKTABLE])
 848                         decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data);
 849         }
 850         else {
 851                 FLAC__bool skip_it = !decoder->private_->metadata_filter[type];
 852                 unsigned real_length = length;
 853                 FLAC__StreamMetadata block;
 854
 855                 block.is_last = is_last;
 856                 block.type = (FLAC__MetadataType)type;
 857                 block.length = length;
 858
 859                 if(type == FLAC__METADATA_TYPE_APPLICATION) {
 860                         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, block.data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8, read_callback_, decoder))
 861                                 return false; /* the read_callback_ sets the state for us */
 862
 863                         real_length -= FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8;
 864
 865                         if(decoder->private_->metadata_filter_ids_count > 0 && has_id_filtered_(decoder, block.data.application.id))
 866                                 skip_it = !skip_it;
 867                 }
 868
 869                 if(skip_it) {
 870                         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, real_length, read_callback_, decoder))
 871                                 return false; /* the read_callback_ sets the state for us */
 872                 }
 873                 else {
 874                         switch(type) {
 875                                 case FLAC__METADATA_TYPE_PADDING:
 876                                         /* skip the padding bytes */
 877                                         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, real_length, read_callback_, decoder))
 878                                                 return false; /* the read_callback_ sets the state for us */
 879                                         break;
 880                                 case FLAC__METADATA_TYPE_APPLICATION:
 881                                         /* remember, we read the ID already */
 882                                         if(real_length > 0) {
 883                                                 if(0 == (block.data.application.data = (FLAC__byte*)malloc(real_length))) {
 884                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 885                                                         return false;
 886                                                 }
 887                                                 if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, block.data.application.data, real_length, read_callback_, decoder))
 888                                                         return false; /* the read_callback_ sets the state for us */
 889                                         }
 890                                         else
 891                                                 block.data.application.data = 0;
 892                                         break;
 893                                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 894                                         if(!read_metadata_vorbiscomment_(decoder, &block.data.vorbis_comment))
 895                                                 return false;
 896                                         break;
 897                                 case FLAC__METADATA_TYPE_STREAMINFO:
 898                                 case FLAC__METADATA_TYPE_SEEKTABLE:
 899                                 default:
 900                                         FLAC__ASSERT(0);
 901                         }
 902                         decoder->private_->metadata_callback(decoder, &block, decoder->private_->client_data);
 903
 904                         /* now we have to free any malloc'ed data in the block */
 905                         switch(type) {
 906                                 case FLAC__METADATA_TYPE_PADDING:
 907                                         break;
 908                                 case FLAC__METADATA_TYPE_APPLICATION:
 909                                         if(0 != block.data.application.data)
 910                                                 free(block.data.application.data);
 911                                         break;
 912                                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 913                                         if(0 != block.data.vorbis_comment.vendor_string.entry)
 914                                                 free(block.data.vorbis_comment.vendor_string.entry);
 915                                         if(block.data.vorbis_comment.num_comments > 0)
 916                                                 for(i = 0; i < block.data.vorbis_comment.num_comments; i++)
 917                                                         if(0 != block.data.vorbis_comment.comments[i].entry)
 918                                                                 free(block.data.vorbis_comment.comments[i].entry);
 919                                         if(0 != block.data.vorbis_comment.comments)
 920                                                 free(block.data.vorbis_comment.comments);
 921                                         break;
 922                                 case FLAC__METADATA_TYPE_STREAMINFO:
 923                                 case FLAC__METADATA_TYPE_SEEKTABLE:
 924                                 default:
 925                                         FLAC__ASSERT(0);
 926                         }
 927                 }
 928         }
 929
 930         if(is_last)
 931                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 932
 933         return true;
 934 }
 935
 936 FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length)
 937 {
 938         FLAC__uint32 x;
 939         unsigned bits, used_bits = 0;
 940
 941         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
 942
 943         decoder->private_->stream_info.type = FLAC__METADATA_TYPE_STREAMINFO;
 944         decoder->private_->stream_info.is_last = is_last;
 945         decoder->private_->stream_info.length = length;
 946
 947         bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN;
 948         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, bits, read_callback_, decoder))
 949                 return false; /* the read_callback_ sets the state for us */
 950         decoder->private_->stream_info.data.stream_info.min_blocksize = x;
 951         used_bits += bits;
 952
 953         bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN;
 954         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN, read_callback_, decoder))
 955                 return false; /* the read_callback_ sets the state for us */
 956         decoder->private_->stream_info.data.stream_info.max_blocksize = x;
 957         used_bits += bits;
 958
 959         bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN;
 960         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN, read_callback_, decoder))
 961                 return false; /* the read_callback_ sets the state for us */
 962         decoder->private_->stream_info.data.stream_info.min_framesize = x;
 963         used_bits += bits;
 964
 965         bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN;
 966         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN, read_callback_, decoder))
 967                 return false; /* the read_callback_ sets the state for us */
 968         decoder->private_->stream_info.data.stream_info.max_framesize = x;
 969         used_bits += bits;
 970
 971         bits = FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN;
 972         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN, read_callback_, decoder))
 973                 return false; /* the read_callback_ sets the state for us */
 974         decoder->private_->stream_info.data.stream_info.sample_rate = x;
 975         used_bits += bits;
 976
 977         bits = FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN;
 978         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN, read_callback_, decoder))
 979                 return false; /* the read_callback_ sets the state for us */
 980         decoder->private_->stream_info.data.stream_info.channels = x+1;
 981         used_bits += bits;
 982
 983         bits = FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN;
 984         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN, read_callback_, decoder))
 985                 return false; /* the read_callback_ sets the state for us */
 986         decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1;
 987         used_bits += bits;
 988
 989         bits = FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN;
 990         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))
 991                 return false; /* the read_callback_ sets the state for us */
 992         used_bits += bits;
 993
 994         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, decoder->private_->stream_info.data.stream_info.md5sum, 16, read_callback_, decoder))
 995                 return false; /* the read_callback_ sets the state for us */
 996         used_bits += 16*8;
 997
 998         /* skip the rest of the block */
 999         FLAC__ASSERT(used_bits % 8 == 0);
1000         length -= (used_bits / 8);
1001         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, length, read_callback_, decoder))
1002                 return false; /* the read_callback_ sets the state for us */
1003
1004         return true;
1005 }
1006
1007 FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length)
1008 {
1009         FLAC__uint32 i, x;
1010         FLAC__uint64 xx;
1011
1012         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
1013
1014         decoder->private_->seek_table.type = FLAC__METADATA_TYPE_SEEKTABLE;
1015         decoder->private_->seek_table.is_last = is_last;
1016         decoder->private_->seek_table.length = length;
1017
1018         decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
1019
1020         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)))) {
1021                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1022                 return false;
1023         }
1024         for(i = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) {
1025                 if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN, read_callback_, decoder))
1026                         return false; /* the read_callback_ sets the state for us */
1027                 decoder->private_->seek_table.data.seek_table.points[i].sample_number = xx;
1028
1029                 if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN, read_callback_, decoder))
1030                         return false; /* the read_callback_ sets the state for us */
1031                 decoder->private_->seek_table.data.seek_table.points[i].stream_offset = xx;
1032
1033                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN, read_callback_, decoder))
1034                         return false; /* the read_callback_ sets the state for us */
1035                 decoder->private_->seek_table.data.seek_table.points[i].frame_samples = x;
1036         }
1037         length -= (decoder->private_->seek_table.data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH);
1038         /* if there is a partial point left, skip over it */
1039         if(length > 0) {
1040                 /*@@@ do an error_callback() here?  there's an argument for either way */
1041                 if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, length, read_callback_, decoder))
1042                         return false; /* the read_callback_ sets the state for us */
1043         }
1044
1045         return true;
1046 }
1047
1048 FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj)
1049 {
1050         FLAC__uint32 i;
1051
1052         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
1053
1054         /* read vendor string */
1055         FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1056         if(!FLAC__bitbuffer_read_raw_uint32_little_endian(decoder->private_->input, &obj->vendor_string.length, read_callback_, decoder))
1057                 return false; /* the read_callback_ sets the state for us */
1058         if(obj->vendor_string.length > 0) {
1059                 if(0 == (obj->vendor_string.entry = (FLAC__byte*)malloc(obj->vendor_string.length))) {
1060                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1061                         return false;
1062                 }
1063                 if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, obj->vendor_string.entry, obj->vendor_string.length, read_callback_, decoder))
1064                         return false; /* the read_callback_ sets the state for us */
1065         }
1066         else
1067                 obj->vendor_string.entry = 0;
1068
1069         /* read num comments */
1070         FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN == 32);
1071         if(!FLAC__bitbuffer_read_raw_uint32_little_endian(decoder->private_->input, &obj->num_comments, read_callback_, decoder))
1072                 return false; /* the read_callback_ sets the state for us */
1073
1074         /* read comments */
1075         if(obj->num_comments > 0) {
1076                 if(0 == (obj->comments = (FLAC__StreamMetadata_VorbisComment_Entry*)malloc(obj->num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) {
1077                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1078                         return false;
1079                 }
1080                 for(i = 0; i < obj->num_comments; i++) {
1081                         FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1082                         if(!FLAC__bitbuffer_read_raw_uint32_little_endian(decoder->private_->input, &obj->comments[i].length, read_callback_, decoder))
1083                                 return false; /* the read_callback_ sets the state for us */
1084                         if(obj->comments[i].length > 0) {
1085                                 if(0 == (obj->comments[i].entry = (FLAC__byte*)malloc(obj->comments[i].length))) {
1086                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1087                                         return false;
1088                                 }
1089                                 if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, obj->comments[i].entry, obj->comments[i].length, read_callback_, decoder))
1090                                         return false; /* the read_callback_ sets the state for us */
1091                         }
1092                         else
1093                                 obj->comments[i].entry = 0;
1094                 }
1095         }
1096         else {
1097                 obj->comments = 0;
1098         }
1099
1100         return true;
1101 }
1102
1103 FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder)
1104 {
1105         FLAC__uint32 x;
1106         unsigned i, skip;
1107
1108         /* skip the version and flags bytes */
1109         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 24, read_callback_, decoder))
1110                 return false; /* the read_callback_ sets the state for us */
1111         /* get the size (in bytes) to skip */
1112         skip = 0;
1113         for(i = 0; i < 4; i++) {
1114                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1115                         return false; /* the read_callback_ sets the state for us */
1116                 skip <<= 7;
1117                 skip |= (x & 0x7f);
1118         }
1119         /* skip the rest of the tag */
1120         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, skip, read_callback_, decoder))
1121                 return false; /* the read_callback_ sets the state for us */
1122         return true;
1123 }
1124
1125 FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder)
1126 {
1127         FLAC__uint32 x;
1128         FLAC__bool first = true;
1129
1130         /* If we know the total number of samples in the stream, stop if we've read that many. */
1131         /* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */
1132         if(decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.total_samples) {
1133                 if(decoder->private_->samples_decoded >= decoder->private_->stream_info.data.stream_info.total_samples) {
1134                         decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1135                         return true;
1136                 }
1137         }
1138
1139         /* make sure we're byte aligned */
1140         if(!FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input)) {
1141                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__bitbuffer_bits_left_for_byte_alignment(decoder->private_->input), read_callback_, decoder))
1142                         return false; /* the read_callback_ sets the state for us */
1143         }
1144
1145         while(1) {
1146                 if(decoder->private_->cached) {
1147                         x = (FLAC__uint32)decoder->private_->lookahead;
1148                         decoder->private_->cached = false;
1149                 }
1150                 else {
1151                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1152                                 return false; /* the read_callback_ sets the state for us */
1153                 }
1154                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1155                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
1156                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1157                                 return false; /* the read_callback_ sets the state for us */
1158
1159                         /* 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 */
1160                         /* else we have to check if the second byte is the end of a sync code */
1161                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1162                                 decoder->private_->lookahead = (FLAC__byte)x;
1163                                 decoder->private_->cached = true;
1164                         }
1165                         else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
1166                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
1167                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
1168                                 return true;
1169                         }
1170                 }
1171                 if(first) {
1172                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1173                         first = false;
1174                 }
1175         }
1176
1177         return true;
1178 }
1179
1180 FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame)
1181 {
1182         unsigned channel;
1183         unsigned i;
1184         FLAC__int32 mid, side, left, right;
1185         FLAC__uint16 frame_crc; /* the one we calculate from the input stream */
1186         FLAC__uint32 x;
1187
1188         *got_a_frame = false;
1189
1190         /* init the CRC */
1191         frame_crc = 0;
1192         FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc);
1193         FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc);
1194         FLAC__bitbuffer_reset_read_crc16(decoder->private_->input, frame_crc);
1195
1196         if(!read_frame_header_(decoder))
1197                 return false;
1198         if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC)
1199                 return true;
1200         if(!allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels))
1201                 return false;
1202         for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
1203                 /*
1204                  * first figure the correct bits-per-sample of the subframe
1205                  */
1206                 unsigned bps = decoder->private_->frame.header.bits_per_sample;
1207                 switch(decoder->private_->frame.header.channel_assignment) {
1208                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1209                                 /* no adjustment needed */
1210                                 break;
1211                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1212                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1213                                 if(channel == 1)
1214                                         bps++;
1215                                 break;
1216                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1217                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1218                                 if(channel == 0)
1219                                         bps++;
1220                                 break;
1221                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1222                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1223                                 if(channel == 1)
1224                                         bps++;
1225                                 break;
1226                         default:
1227                                 FLAC__ASSERT(0);
1228                 }
1229                 /*
1230                  * now read it
1231                  */
1232                 if(!read_subframe_(decoder, channel, bps))
1233                         return false;
1234                 if(decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME) {
1235                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1236                         return true;
1237                 }
1238         }
1239         if(!read_zero_padding_(decoder))
1240                 return false;
1241
1242         /*
1243          * Read the frame CRC-16 from the footer and check
1244          */
1245         frame_crc = FLAC__bitbuffer_get_read_crc16(decoder->private_->input);
1246         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN, read_callback_, decoder))
1247                 return false; /* the read_callback_ sets the state for us */
1248         if(frame_crc == (FLAC__uint16)x) {
1249                 /* Undo any special channel coding */
1250                 switch(decoder->private_->frame.header.channel_assignment) {
1251                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1252                                 /* do nothing */
1253                                 break;
1254                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1255                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1256                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1257                                         decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i];
1258                                 break;
1259                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1260                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1261                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1262                                         decoder->private_->output[0][i] += decoder->private_->output[1][i];
1263                                 break;
1264                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1265                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1266                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
1267                                         mid = decoder->private_->output[0][i];
1268                                         side = decoder->private_->output[1][i];
1269                                         mid <<= 1;
1270                                         if(side & 1) /* i.e. if 'side' is odd... */
1271                                                 mid++;
1272                                         left = mid + side;
1273                                         right = mid - side;
1274                                         decoder->private_->output[0][i] = left >> 1;
1275                                         decoder->private_->output[1][i] = right >> 1;
1276                                 }
1277                                 break;
1278                         default:
1279                                 FLAC__ASSERT(0);
1280                                 break;
1281                 }
1282         }
1283         else {
1284                 /* Bad frame, emit error and zero the output signal */
1285                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH, decoder->private_->client_data);
1286                 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
1287                         memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
1288                 }
1289         }
1290
1291         *got_a_frame = true;
1292
1293         /* put the latest values into the public section of the decoder instance */
1294         decoder->protected_->channels = decoder->private_->frame.header.channels;
1295         decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment;
1296         decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample;
1297         decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate;
1298         decoder->protected_->blocksize = decoder->private_->frame.header.blocksize;
1299
1300         FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
1301         decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize;
1302
1303         /* write it */
1304         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)
1305                 return false;
1306
1307         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1308         return true;
1309 }
1310
1311 FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder)
1312 {
1313         FLAC__uint32 x;
1314         FLAC__uint64 xx;
1315         unsigned i, blocksize_hint = 0, sample_rate_hint = 0;
1316         FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */
1317         unsigned raw_header_len;
1318         FLAC__bool is_unparseable = false;
1319         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);
1320         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);
1321
1322         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
1323
1324         /* init the raw header with the saved bits from synchronization */
1325         raw_header[0] = decoder->private_->header_warmup[0];
1326         raw_header[1] = decoder->private_->header_warmup[1];
1327         raw_header_len = 2;
1328
1329         /*
1330          * check to make sure that the reserved bits are 0
1331          */
1332         if(raw_header[1] & 0x03) { /* MAGIC NUMBER */
1333                 is_unparseable = true;
1334         }
1335
1336         /*
1337          * Note that along the way as we read the header, we look for a sync
1338          * code inside.  If we find one it would indicate that our original
1339          * sync was bad since there cannot be a sync code in a valid header.
1340          */
1341
1342         /*
1343          * read in the raw header as bytes so we can CRC it, and parse it on the way
1344          */
1345         for(i = 0; i < 2; i++) {
1346                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1347                         return false; /* the read_callback_ sets the state for us */
1348                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1349                         /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */
1350                         decoder->private_->lookahead = (FLAC__byte)x;
1351                         decoder->private_->cached = true;
1352                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1353                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1354                         return true;
1355                 }
1356                 raw_header[raw_header_len++] = (FLAC__byte)x;
1357         }
1358
1359         switch(x = raw_header[2] >> 4) {
1360                 case 0:
1361                         if(is_known_fixed_blocksize_stream)
1362                                 decoder->private_->frame.header.blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize;
1363                         else
1364                                 is_unparseable = true;
1365                         break;
1366                 case 1:
1367                         decoder->private_->frame.header.blocksize = 192;
1368                         break;
1369                 case 2:
1370                 case 3:
1371                 case 4:
1372                 case 5:
1373                         decoder->private_->frame.header.blocksize = 576 << (x-2);
1374                         break;
1375                 case 6:
1376                 case 7:
1377                         blocksize_hint = x;
1378                         break;
1379                 case 8:
1380                 case 9:
1381                 case 10:
1382                 case 11:
1383                 case 12:
1384                 case 13:
1385                 case 14:
1386                 case 15:
1387                         decoder->private_->frame.header.blocksize = 256 << (x-8);
1388                         break;
1389                 default:
1390                         FLAC__ASSERT(0);
1391                         break;
1392         }
1393
1394         switch(x = raw_header[2] & 0x0f) {
1395                 case 0:
1396                         if(decoder->private_->has_stream_info)
1397                                 decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate;
1398                         else
1399                                 is_unparseable = true;
1400                         break;
1401                 case 1:
1402                 case 2:
1403                 case 3:
1404                         is_unparseable = true;
1405                         break;
1406                 case 4:
1407                         decoder->private_->frame.header.sample_rate = 8000;
1408                         break;
1409                 case 5:
1410                         decoder->private_->frame.header.sample_rate = 16000;
1411                         break;
1412                 case 6:
1413                         decoder->private_->frame.header.sample_rate = 22050;
1414                         break;
1415                 case 7:
1416                         decoder->private_->frame.header.sample_rate = 24000;
1417                         break;
1418                 case 8:
1419                         decoder->private_->frame.header.sample_rate = 32000;
1420                         break;
1421                 case 9:
1422                         decoder->private_->frame.header.sample_rate = 44100;
1423                         break;
1424                 case 10:
1425                         decoder->private_->frame.header.sample_rate = 48000;
1426                         break;
1427                 case 11:
1428                         decoder->private_->frame.header.sample_rate = 96000;
1429                         break;
1430                 case 12:
1431                 case 13:
1432                 case 14:
1433                         sample_rate_hint = x;
1434                         break;
1435                 case 15:
1436                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1437                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1438                         return true;
1439                 default:
1440                         FLAC__ASSERT(0);
1441         }
1442
1443         x = (unsigned)(raw_header[3] >> 4);
1444         if(x & 8) {
1445                 decoder->private_->frame.header.channels = 2;
1446                 switch(x & 7) {
1447                         case 0:
1448                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE;
1449                                 break;
1450                         case 1:
1451                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE;
1452                                 break;
1453                         case 2:
1454                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE;
1455                                 break;
1456                         default:
1457                                 is_unparseable = true;
1458                                 break;
1459                 }
1460         }
1461         else {
1462                 decoder->private_->frame.header.channels = (unsigned)x + 1;
1463                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT;
1464         }
1465
1466         switch(x = (unsigned)(raw_header[3] & 0x0e) >> 1) {
1467                 case 0:
1468                         if(decoder->private_->has_stream_info)
1469                                 decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample;
1470                         else
1471                                 is_unparseable = true;
1472                         break;
1473                 case 1:
1474                         decoder->private_->frame.header.bits_per_sample = 8;
1475                         break;
1476                 case 2:
1477                         decoder->private_->frame.header.bits_per_sample = 12;
1478                         break;
1479                 case 4:
1480                         decoder->private_->frame.header.bits_per_sample = 16;
1481                         break;
1482                 case 5:
1483                         decoder->private_->frame.header.bits_per_sample = 20;
1484                         break;
1485                 case 6:
1486                         decoder->private_->frame.header.bits_per_sample = 24;
1487                         break;
1488                 case 3:
1489                 case 7:
1490                         is_unparseable = true;
1491                         break;
1492                 default:
1493                         FLAC__ASSERT(0);
1494                         break;
1495         }
1496
1497         if(raw_header[3] & 0x01) { /* this should be a zero padding bit */
1498                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1499                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1500                 return true;
1501         }
1502
1503         if(blocksize_hint && is_known_variable_blocksize_stream) {
1504                 if(!FLAC__bitbuffer_read_utf8_uint64(decoder->private_->input, &xx, read_callback_, decoder, raw_header, &raw_header_len))
1505                         return false; /* the read_callback_ sets the state for us */
1506                 if(xx == 0xffffffffffffffff) { /* i.e. non-UTF8 code... */
1507                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
1508                         decoder->private_->cached = true;
1509                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1510                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1511                         return true;
1512                 }
1513                 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
1514                 decoder->private_->frame.header.number.sample_number = xx;
1515         }
1516         else {
1517                 if(!FLAC__bitbuffer_read_utf8_uint32(decoder->private_->input, &x, read_callback_, decoder, raw_header, &raw_header_len))
1518                         return false; /* the read_callback_ sets the state for us */
1519                 if(x == 0xffffffff) { /* i.e. non-UTF8 code... */
1520                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
1521                         decoder->private_->cached = true;
1522                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1523                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1524                         return true;
1525                 }
1526                 decoder->private_->last_frame_number = x;
1527                 if(decoder->private_->has_stream_info) {
1528                         decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
1529                         decoder->private_->frame.header.number.sample_number = (FLAC__int64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__int64)x;
1530                 }
1531                 else {
1532                         is_unparseable = true;
1533                 }
1534         }
1535
1536         if(blocksize_hint) {
1537                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1538                         return false; /* the read_callback_ sets the state for us */
1539                 raw_header[raw_header_len++] = (FLAC__byte)x;
1540                 if(blocksize_hint == 7) {
1541                         FLAC__uint32 _x;
1542                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &_x, 8, read_callback_, decoder))
1543                                 return false; /* the read_callback_ sets the state for us */
1544                         raw_header[raw_header_len++] = (FLAC__byte)_x;
1545                         x = (x << 8) | _x;
1546                 }
1547                 decoder->private_->frame.header.blocksize = x+1;
1548         }
1549
1550         if(sample_rate_hint) {
1551                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1552                         return false; /* the read_callback_ sets the state for us */
1553                 raw_header[raw_header_len++] = (FLAC__byte)x;
1554                 if(sample_rate_hint != 12) {
1555                         FLAC__uint32 _x;
1556                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &_x, 8, read_callback_, decoder))
1557                                 return false; /* the read_callback_ sets the state for us */
1558                         raw_header[raw_header_len++] = (FLAC__byte)_x;
1559                         x = (x << 8) | _x;
1560                 }
1561                 if(sample_rate_hint == 12)
1562                         decoder->private_->frame.header.sample_rate = x*1000;
1563                 else if(sample_rate_hint == 13)
1564                         decoder->private_->frame.header.sample_rate = x;
1565                 else
1566                         decoder->private_->frame.header.sample_rate = x*10;
1567         }
1568
1569         /* read the CRC-8 byte */
1570         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1571                 return false; /* the read_callback_ sets the state for us */
1572         crc8 = (FLAC__byte)x;
1573
1574         if(FLAC__crc8(raw_header, raw_header_len) != crc8) {
1575                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1576                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1577                 return true;
1578         }
1579
1580         if(is_unparseable) {
1581                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1582                 return false;
1583         }
1584
1585         return true;
1586 }
1587
1588 FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1589 {
1590         FLAC__uint32 x;
1591         FLAC__bool wasted_bits;
1592
1593         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder)) /* MAGIC NUMBER */
1594                 return false; /* the read_callback_ sets the state for us */
1595
1596         wasted_bits = (x & 1);
1597         x &= 0xfe;
1598
1599         if(wasted_bits) {
1600                 unsigned u;
1601                 if(!FLAC__bitbuffer_read_unary_unsigned(decoder->private_->input, &u, read_callback_, decoder))
1602                         return false; /* the read_callback_ sets the state for us */
1603                 decoder->private_->frame.subframes[channel].wasted_bits = u+1;
1604                 bps -= decoder->private_->frame.subframes[channel].wasted_bits;
1605         }
1606         else
1607                 decoder->private_->frame.subframes[channel].wasted_bits = 0;
1608
1609         /*
1610          * Lots of magic numbers here
1611          */
1612         if(x & 0x80) {
1613                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1614                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1615                 return true;
1616         }
1617         else if(x == 0) {
1618                 if(!read_subframe_constant_(decoder, channel, bps))
1619                         return false;
1620         }
1621         else if(x == 2) {
1622                 if(!read_subframe_verbatim_(decoder, channel, bps))
1623                         return false;
1624         }
1625         else if(x < 16) {
1626                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1627                 return false;
1628         }
1629         else if(x <= 24) {
1630                 if(!read_subframe_fixed_(decoder, channel, bps, (x>>1)&7))
1631                         return false;
1632         }
1633         else if(x < 64) {
1634                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1635                 return false;
1636         }
1637         else {
1638                 if(!read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1))
1639                         return false;
1640         }
1641
1642         if(wasted_bits) {
1643                 unsigned i;
1644                 x = decoder->private_->frame.subframes[channel].wasted_bits;
1645                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1646                         decoder->private_->output[channel][i] <<= x;
1647         }
1648
1649         return true;
1650 }
1651
1652 FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1653 {
1654         FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant;
1655         FLAC__int32 x;
1656         unsigned i;
1657         FLAC__int32 *output = decoder->private_->output[channel];
1658
1659         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT;
1660
1661         if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &x, bps, read_callback_, decoder))
1662                 return false; /* the read_callback_ sets the state for us */
1663
1664         subframe->value = x;
1665
1666         /* decode the subframe */
1667         for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1668                 output[i] = x;
1669
1670         return true;
1671 }
1672
1673 FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order)
1674 {
1675         FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed;
1676         FLAC__int32 i32;
1677         FLAC__uint32 u32;
1678         unsigned u;
1679
1680         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED;
1681
1682         subframe->residual = decoder->private_->residual[channel];
1683         subframe->order = order;
1684
1685         /* read warm-up samples */
1686         for(u = 0; u < order; u++) {
1687                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, bps, read_callback_, decoder))
1688                         return false; /* the read_callback_ sets the state for us */
1689                 subframe->warmup[u] = i32;
1690         }
1691
1692         /* read entropy coding method info */
1693         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder))
1694                 return false; /* the read_callback_ sets the state for us */
1695         subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
1696         switch(subframe->entropy_coding_method.type) {
1697                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1698                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder))
1699                                 return false; /* the read_callback_ sets the state for us */
1700                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
1701                         subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
1702                         break;
1703                 default:
1704                         decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1705                         return false;
1706         }
1707
1708         /* read residual */
1709         switch(subframe->entropy_coding_method.type) {
1710                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1711                         if(!read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, &decoder->private_->partitioned_rice_contents[channel], decoder->private_->residual[channel]))
1712                                 return false;
1713                         break;
1714                 default:
1715                         FLAC__ASSERT(0);
1716         }
1717
1718         /* decode the subframe */
1719         memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
1720         FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order);
1721
1722         return true;
1723 }
1724
1725 FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order)
1726 {
1727         FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc;
1728         FLAC__int32 i32;
1729         FLAC__uint32 u32;
1730         unsigned u;
1731
1732         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC;
1733
1734         subframe->residual = decoder->private_->residual[channel];
1735         subframe->order = order;
1736
1737         /* read warm-up samples */
1738         for(u = 0; u < order; u++) {
1739                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, bps, read_callback_, decoder))
1740                         return false; /* the read_callback_ sets the state for us */
1741                 subframe->warmup[u] = i32;
1742         }
1743
1744         /* read qlp coeff precision */
1745         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN, read_callback_, decoder))
1746                 return false; /* the read_callback_ sets the state for us */
1747         if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) {
1748                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1749                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1750                 return true;
1751         }
1752         subframe->qlp_coeff_precision = u32+1;
1753
1754         /* read qlp shift */
1755         if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN, read_callback_, decoder))
1756                 return false; /* the read_callback_ sets the state for us */
1757         subframe->quantization_level = i32;
1758
1759         /* read quantized lp coefficiencts */
1760         for(u = 0; u < order; u++) {
1761                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision, read_callback_, decoder))
1762                         return false; /* the read_callback_ sets the state for us */
1763                 subframe->qlp_coeff[u] = i32;
1764         }
1765
1766         /* read entropy coding method info */
1767         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder))
1768                 return false; /* the read_callback_ sets the state for us */
1769         subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
1770         switch(subframe->entropy_coding_method.type) {
1771                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1772                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder))
1773                                 return false; /* the read_callback_ sets the state for us */
1774                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
1775                         subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
1776                         break;
1777                 default:
1778                         decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1779                         return false;
1780         }
1781
1782         /* read residual */
1783         switch(subframe->entropy_coding_method.type) {
1784                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1785                         if(!read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, &decoder->private_->partitioned_rice_contents[channel], decoder->private_->residual[channel]))
1786                                 return false;
1787                         break;
1788                 default:
1789                         FLAC__ASSERT(0);
1790         }
1791
1792         /* decode the subframe */
1793         memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
1794         if(bps + subframe->qlp_coeff_precision + FLAC__bitmath_ilog2(order) <= 32)
1795                 if(bps <= 16 && subframe->qlp_coeff_precision <= 16)
1796                         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);
1797                 else
1798                         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);
1799         else
1800                 decoder->private_->local_lpc_restore_signal_64bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
1801
1802         return true;
1803 }
1804
1805 FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1806 {
1807         FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim;
1808         FLAC__int32 x, *residual = decoder->private_->residual[channel];
1809         unsigned i;
1810
1811         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM;
1812
1813         subframe->data = residual;
1814
1815         for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
1816                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &x, bps, read_callback_, decoder))
1817                         return false; /* the read_callback_ sets the state for us */
1818                 residual[i] = x;
1819         }
1820
1821         /* decode the subframe */
1822         memcpy(decoder->private_->output[channel], subframe->data, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
1823
1824         return true;
1825 }
1826
1827 FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, unsigned partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual)
1828 {
1829         FLAC__uint32 rice_parameter;
1830         int i;
1831         unsigned partition, sample, u;
1832         const unsigned partitions = 1u << partition_order;
1833         const unsigned partition_samples = partition_order > 0? decoder->private_->frame.header.blocksize >> partition_order : decoder->private_->frame.header.blocksize - predictor_order;
1834
1835         if(!FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(partitioned_rice_contents, max(6, partition_order))) {
1836                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1837                 return false;
1838         }
1839
1840         sample = 0;
1841         for(partition = 0; partition < partitions; partition++) {
1842                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN, read_callback_, decoder))
1843                         return false; /* the read_callback_ sets the state for us */
1844                 partitioned_rice_contents->parameters[partition] = rice_parameter;
1845                 if(rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1846 #ifdef FLAC__SYMMETRIC_RICE
1847                         for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
1848                                 if(!FLAC__bitbuffer_read_symmetric_rice_signed(decoder->private_->input, &i, rice_parameter, read_callback_, decoder))
1849                                         return false; /* the read_callback_ sets the state for us */
1850                                 residual[sample] = i;
1851                         }
1852 #else
1853                         u = (partition_order == 0 || partition > 0)? partition_samples : partition_samples - predictor_order;
1854                         if(!FLAC__bitbuffer_read_rice_signed_block(decoder->private_->input, residual + sample, u, rice_parameter, read_callback_, decoder))
1855                                 return false; /* the read_callback_ sets the state for us */
1856                         sample += u;
1857 #endif
1858                 }
1859                 else {
1860                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN, read_callback_, decoder))
1861                                 return false; /* the read_callback_ sets the state for us */
1862                         partitioned_rice_contents->raw_bits[partition] = rice_parameter;
1863                         for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
1864                                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i, rice_parameter, read_callback_, decoder))
1865                                         return false; /* the read_callback_ sets the state for us */
1866                                 residual[sample] = i;
1867                         }
1868                 }
1869         }
1870
1871         return true;
1872 }
1873
1874 FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder)
1875 {
1876         if(!FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input)) {
1877                 FLAC__uint32 zero = 0;
1878                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &zero, FLAC__bitbuffer_bits_left_for_byte_alignment(decoder->private_->input), read_callback_, decoder))
1879                         return false; /* the read_callback_ sets the state for us */
1880                 if(zero != 0) {
1881                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1882                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1883                 }
1884         }
1885         return true;
1886 }
1887
1888 FLAC__bool read_callback_(FLAC__byte buffer[], unsigned *bytes, void *client_data)
1889 {
1890         FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data;
1891         FLAC__StreamDecoderReadStatus status;
1892
1893         status = decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data);
1894         if(status == FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM)
1895                 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1896         else if(status == FLAC__STREAM_DECODER_READ_STATUS_ABORT)
1897                 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
1898         return status == FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
1899 }