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 read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj);
  61 static FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder);
  62 static FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder);
  63 static FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame);
  64 static FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder);
  65 static FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  66 static FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  67 static FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order);
  68 static FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order);
  69 static FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  70 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);
  71 static FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder);
  72 static FLAC__bool read_callback_(FLAC__byte buffer[], unsigned *bytes, void *client_data);
  73
  74 /***********************************************************************
  75  *
  76  * Private class data
  77  *
  78  ***********************************************************************/
  79
  80 typedef struct FLAC__StreamDecoderPrivate {
  81         FLAC__StreamDecoderReadCallback read_callback;
  82         FLAC__StreamDecoderWriteCallback write_callback;
  83         FLAC__StreamDecoderMetadataCallback metadata_callback;
  84         FLAC__StreamDecoderErrorCallback error_callback;
  85         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[]);
  86         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[]);
  87         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[]);
  88         void *client_data;
  89         FLAC__BitBuffer *input;
  90         FLAC__int32 *output[FLAC__MAX_CHANNELS];
  91         FLAC__int32 *residual[FLAC__MAX_CHANNELS];
  92         FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents[FLAC__MAX_CHANNELS];
  93         unsigned output_capacity, output_channels;
  94         FLAC__uint32 last_frame_number;
  95         FLAC__uint64 samples_decoded;
  96         FLAC__bool has_stream_info, has_seek_table;
  97         FLAC__StreamMetadata stream_info;
  98         FLAC__StreamMetadata seek_table;
  99         FLAC__bool metadata_filter[FLAC__METADATA_TYPE_UNDEFINED];
 100         FLAC__byte *metadata_filter_ids;
 101         unsigned metadata_filter_ids_count, metadata_filter_ids_capacity; /* units for both are IDs, not bytes */
 102         FLAC__Frame frame;
 103         FLAC__bool cached; /* true if there is a byte in lookahead */
 104         FLAC__CPUInfo cpuinfo;
 105         FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */
 106         FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */
 107 } FLAC__StreamDecoderPrivate;
 108
 109 /***********************************************************************
 110  *
 111  * Public static class data
 112  *
 113  ***********************************************************************/
 114
 115 FLAC_API const char * const FLAC__StreamDecoderStateString[] = {
 116         "FLAC__STREAM_DECODER_SEARCH_FOR_METADATA",
 117         "FLAC__STREAM_DECODER_READ_METADATA",
 118         "FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC",
 119         "FLAC__STREAM_DECODER_READ_FRAME",
 120         "FLAC__STREAM_DECODER_END_OF_STREAM",
 121         "FLAC__STREAM_DECODER_ABORTED",
 122         "FLAC__STREAM_DECODER_UNPARSEABLE_STREAM",
 123         "FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR",
 124         "FLAC__STREAM_DECODER_ALREADY_INITIALIZED",
 125         "FLAC__STREAM_DECODER_INVALID_CALLBACK",
 126         "FLAC__STREAM_DECODER_UNINITIALIZED"
 127 };
 128
 129 FLAC_API const char * const FLAC__StreamDecoderReadStatusString[] = {
 130         "FLAC__STREAM_DECODER_READ_STATUS_CONTINUE",
 131         "FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM",
 132         "FLAC__STREAM_DECODER_READ_STATUS_ABORT"
 133 };
 134
 135 FLAC_API const char * const FLAC__StreamDecoderWriteStatusString[] = {
 136         "FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE",
 137         "FLAC__STREAM_DECODER_WRITE_STATUS_ABORT"
 138 };
 139
 140 FLAC_API const char * const FLAC__StreamDecoderErrorStatusString[] = {
 141         "FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC",
 142         "FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER",
 143         "FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH"
 144 };
 145
 146 /***********************************************************************
 147  *
 148  * Class constructor/destructor
 149  *
 150  ***********************************************************************/
 151 FLAC_API FLAC__StreamDecoder *FLAC__stream_decoder_new()
 152 {
 153         FLAC__StreamDecoder *decoder;
 154         unsigned i;
 155
 156         FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
 157
 158         decoder = (FLAC__StreamDecoder*)calloc(1, sizeof(FLAC__StreamDecoder));
 159         if(decoder == 0) {
 160                 return 0;
 161         }
 162
 163         decoder->protected_ = (FLAC__StreamDecoderProtected*)calloc(1, sizeof(FLAC__StreamDecoderProtected));
 164         if(decoder->protected_ == 0) {
 165                 free(decoder);
 166                 return 0;
 167         }
 168
 169         decoder->private_ = (FLAC__StreamDecoderPrivate*)calloc(1, sizeof(FLAC__StreamDecoderPrivate));
 170         if(decoder->private_ == 0) {
 171                 free(decoder->protected_);
 172                 free(decoder);
 173                 return 0;
 174         }
 175
 176         decoder->private_->input = FLAC__bitbuffer_new();
 177         if(decoder->private_->input == 0) {
 178                 free(decoder->private_);
 179                 free(decoder->protected_);
 180                 free(decoder);
 181                 return 0;
 182         }
 183
 184         decoder->private_->metadata_filter_ids_capacity = 16;
 185         if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)malloc((FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) * decoder->private_->metadata_filter_ids_capacity))) {
 186                 FLAC__bitbuffer_delete(decoder->private_->input);
 187                 free(decoder->private_);
 188                 free(decoder->protected_);
 189                 free(decoder);
 190                 return 0;
 191         }
 192
 193         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 194                 decoder->private_->output[i] = 0;
 195                 decoder->private_->residual[i] = 0;
 196         }
 197
 198         decoder->private_->output_capacity = 0;
 199         decoder->private_->output_channels = 0;
 200         decoder->private_->has_seek_table = false;
 201
 202         for(i = 0; i < FLAC__MAX_CHANNELS; i++)
 203                 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&decoder->private_->partitioned_rice_contents[i]);
 204
 205         set_defaults_(decoder);
 206
 207         decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
 208
 209         return decoder;
 210 }
 211
 212 FLAC_API void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder)
 213 {
 214         unsigned i;
 215
 216         FLAC__ASSERT(0 != decoder);
 217         FLAC__ASSERT(0 != decoder->protected_);
 218         FLAC__ASSERT(0 != decoder->private_);
 219         FLAC__ASSERT(0 != decoder->private_->input);
 220
 221         FLAC__stream_decoder_finish(decoder);
 222
 223         if(0 != decoder->private_->metadata_filter_ids)
 224                 free(decoder->private_->metadata_filter_ids);
 225
 226         FLAC__bitbuffer_delete(decoder->private_->input);
 227
 228         for(i = 0; i < FLAC__MAX_CHANNELS; i++)
 229                 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&decoder->private_->partitioned_rice_contents[i]);
 230
 231         free(decoder->private_);
 232         free(decoder->protected_);
 233         free(decoder);
 234 }
 235
 236 /***********************************************************************
 237  *
 238  * Public class methods
 239  *
 240  ***********************************************************************/
 241
 242 FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_init(FLAC__StreamDecoder *decoder)
 243 {
 244         FLAC__ASSERT(0 != decoder);
 245
 246         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 247                 return decoder->protected_->state = FLAC__STREAM_DECODER_ALREADY_INITIALIZED;
 248
 249         if(0 == decoder->private_->read_callback || 0 == decoder->private_->write_callback || 0 == decoder->private_->metadata_callback || 0 == decoder->private_->error_callback)
 250                 return decoder->protected_->state = FLAC__STREAM_DECODER_INVALID_CALLBACK;
 251
 252         if(!FLAC__bitbuffer_init(decoder->private_->input))
 253                 return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 254
 255         decoder->private_->last_frame_number = 0;
 256         decoder->private_->samples_decoded = 0;
 257         decoder->private_->has_stream_info = false;
 258         decoder->private_->cached = false;
 259
 260         /*
 261          * get the CPU info and set the function pointers
 262          */
 263         FLAC__cpu_info(&decoder->private_->cpuinfo);
 264         /* first default to the non-asm routines */
 265         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal;
 266         decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide;
 267         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal;
 268         /* now override with asm where appropriate */
 269 #ifndef FLAC__NO_ASM
 270         if(decoder->private_->cpuinfo.use_asm) {
 271 #ifdef FLAC__CPU_IA32
 272                 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
 273 #ifdef FLAC__HAS_NASM
 274                 if(decoder->private_->cpuinfo.data.ia32.mmx) {
 275                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
 276                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32_mmx;
 277                 }
 278                 else {
 279                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
 280                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32;
 281                 }
 282 #endif
 283 #endif
 284         }
 285 #endif
 286
 287         if(!FLAC__stream_decoder_reset(decoder))
 288                 return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 289
 290         return decoder->protected_->state;
 291 }
 292
 293 FLAC_API void FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder)
 294 {
 295         unsigned i;
 296         FLAC__ASSERT(0 != decoder);
 297         if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
 298                 return;
 299         if(decoder->private_->has_seek_table) {
 300                 FLAC__ASSERT(0 != decoder->private_->seek_table.data.seek_table.points);
 301                 free(decoder->private_->seek_table.data.seek_table.points);
 302                 decoder->private_->seek_table.data.seek_table.points = 0;
 303                 decoder->private_->has_seek_table = false;
 304         }
 305         FLAC__bitbuffer_free(decoder->private_->input);
 306         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 307                 /* WATCHOUT:
 308                  * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the
 309                  * output arrays have a buffer of up to 3 zeroes in front
 310                  * (at negative indices) for alignment purposes; we use 4
 311                  * to keep the data well-aligned.
 312                  */
 313                 if(0 != decoder->private_->output[i]) {
 314                         free(decoder->private_->output[i]-4);
 315                         decoder->private_->output[i] = 0;
 316                 }
 317                 if(0 != decoder->private_->residual[i]) {
 318                         free(decoder->private_->residual[i]);
 319                         decoder->private_->residual[i] = 0;
 320                 }
 321         }
 322         decoder->private_->output_capacity = 0;
 323         decoder->private_->output_channels = 0;
 324
 325         set_defaults_(decoder);
 326
 327         decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
 328 }
 329
 330 FLAC_API FLAC__bool FLAC__stream_decoder_set_read_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderReadCallback value)
 331 {
 332         FLAC__ASSERT(0 != decoder);
 333         FLAC__ASSERT(0 != decoder->private_);
 334         FLAC__ASSERT(0 != decoder->protected_);
 335         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 336                 return false;
 337         decoder->private_->read_callback = value;
 338         return true;
 339 }
 340
 341 FLAC_API FLAC__bool FLAC__stream_decoder_set_write_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderWriteCallback value)
 342 {
 343         FLAC__ASSERT(0 != decoder);
 344         FLAC__ASSERT(0 != decoder->private_);
 345         FLAC__ASSERT(0 != decoder->protected_);
 346         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 347                 return false;
 348         decoder->private_->write_callback = value;
 349         return true;
 350 }
 351
 352 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderMetadataCallback value)
 353 {
 354         FLAC__ASSERT(0 != decoder);
 355         FLAC__ASSERT(0 != decoder->private_);
 356         FLAC__ASSERT(0 != decoder->protected_);
 357         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 358                 return false;
 359         decoder->private_->metadata_callback = value;
 360         return true;
 361 }
 362
 363 FLAC_API FLAC__bool FLAC__stream_decoder_set_error_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorCallback value)
 364 {
 365         FLAC__ASSERT(0 != decoder);
 366         FLAC__ASSERT(0 != decoder->private_);
 367         FLAC__ASSERT(0 != decoder->protected_);
 368         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 369                 return false;
 370         decoder->private_->error_callback = value;
 371         return true;
 372 }
 373
 374 FLAC_API FLAC__bool FLAC__stream_decoder_set_client_data(FLAC__StreamDecoder *decoder, void *value)
 375 {
 376         FLAC__ASSERT(0 != decoder);
 377         FLAC__ASSERT(0 != decoder->private_);
 378         FLAC__ASSERT(0 != decoder->protected_);
 379         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 380                 return false;
 381         decoder->private_->client_data = value;
 382         return true;
 383 }
 384
 385 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
 386 {
 387         FLAC__ASSERT(0 != decoder);
 388         FLAC__ASSERT(0 != decoder->private_);
 389         FLAC__ASSERT(0 != decoder->protected_);
 390         FLAC__ASSERT(type < FLAC__METADATA_TYPE_UNDEFINED);
 391         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 392                 return false;
 393         decoder->private_->metadata_filter[type] = true;
 394         if(type == FLAC__METADATA_TYPE_APPLICATION)
 395                 decoder->private_->metadata_filter_ids_count = 0;
 396         return true;
 397 }
 398
 399 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
 400 {
 401         FLAC__ASSERT(0 != decoder);
 402         FLAC__ASSERT(0 != decoder->private_);
 403         FLAC__ASSERT(0 != decoder->protected_);
 404         FLAC__ASSERT(0 != id);
 405         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 406                 return false;
 407
 408         if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
 409                 return true;
 410
 411         FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
 412
 413         if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
 414                 if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2)))
 415                         return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 416                 decoder->private_->metadata_filter_ids_capacity *= 2;
 417         }
 418
 419         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));
 420         decoder->private_->metadata_filter_ids_count++;
 421
 422         return true;
 423 }
 424
 425 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder)
 426 {
 427         unsigned i;
 428         FLAC__ASSERT(0 != decoder);
 429         FLAC__ASSERT(0 != decoder->private_);
 430         FLAC__ASSERT(0 != decoder->protected_);
 431         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 432                 return false;
 433         for(i = 0; i < sizeof(decoder->private_->metadata_filter) / sizeof(decoder->private_->metadata_filter[0]); i++)
 434                 decoder->private_->metadata_filter[i] = true;
 435         decoder->private_->metadata_filter_ids_count = 0;
 436         return true;
 437 }
 438
 439 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
 440 {
 441         FLAC__ASSERT(0 != decoder);
 442         FLAC__ASSERT(0 != decoder->private_);
 443         FLAC__ASSERT(0 != decoder->protected_);
 444         FLAC__ASSERT(type < FLAC__METADATA_TYPE_UNDEFINED);
 445         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 446                 return false;
 447         decoder->private_->metadata_filter[type] = false;
 448         if(type == FLAC__METADATA_TYPE_APPLICATION)
 449                 decoder->private_->metadata_filter_ids_count = 0;
 450         return true;
 451 }
 452
 453 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
 454 {
 455         FLAC__ASSERT(0 != decoder);
 456         FLAC__ASSERT(0 != decoder->private_);
 457         FLAC__ASSERT(0 != decoder->protected_);
 458         FLAC__ASSERT(0 != id);
 459         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 460                 return false;
 461
 462         if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
 463                 return true;
 464
 465         FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
 466
 467         if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
 468                 if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2)))
 469                         return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 470                 decoder->private_->metadata_filter_ids_capacity *= 2;
 471         }
 472
 473         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));
 474         decoder->private_->metadata_filter_ids_count++;
 475
 476         return true;
 477 }
 478
 479 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder)
 480 {
 481         FLAC__ASSERT(0 != decoder);
 482         FLAC__ASSERT(0 != decoder->private_);
 483         FLAC__ASSERT(0 != decoder->protected_);
 484         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 485                 return false;
 486         memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
 487         decoder->private_->metadata_filter_ids_count = 0;
 488         return true;
 489 }
 490
 491 FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder)
 492 {
 493         FLAC__ASSERT(0 != decoder);
 494         FLAC__ASSERT(0 != decoder->protected_);
 495         return decoder->protected_->state;
 496 }
 497
 498 FLAC_API unsigned FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder)
 499 {
 500         FLAC__ASSERT(0 != decoder);
 501         FLAC__ASSERT(0 != decoder->protected_);
 502         return decoder->protected_->channels;
 503 }
 504
 505 FLAC_API FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder)
 506 {
 507         FLAC__ASSERT(0 != decoder);
 508         FLAC__ASSERT(0 != decoder->protected_);
 509         return decoder->protected_->channel_assignment;
 510 }
 511
 512 FLAC_API unsigned FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder)
 513 {
 514         FLAC__ASSERT(0 != decoder);
 515         FLAC__ASSERT(0 != decoder->protected_);
 516         return decoder->protected_->bits_per_sample;
 517 }
 518
 519 FLAC_API unsigned FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder)
 520 {
 521         FLAC__ASSERT(0 != decoder);
 522         FLAC__ASSERT(0 != decoder->protected_);
 523         return decoder->protected_->sample_rate;
 524 }
 525
 526 FLAC_API unsigned FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder)
 527 {
 528         FLAC__ASSERT(0 != decoder);
 529         FLAC__ASSERT(0 != decoder->protected_);
 530         return decoder->protected_->blocksize;
 531 }
 532
 533 FLAC_API FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder)
 534 {
 535         FLAC__ASSERT(0 != decoder);
 536         FLAC__ASSERT(0 != decoder->private_);
 537         FLAC__ASSERT(0 != decoder->protected_);
 538
 539         if(!FLAC__bitbuffer_clear(decoder->private_->input)) {
 540                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 541                 return false;
 542         }
 543         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 544
 545         return true;
 546 }
 547
 548 FLAC_API FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder)
 549 {
 550         FLAC__ASSERT(0 != decoder);
 551         FLAC__ASSERT(0 != decoder->private_);
 552         FLAC__ASSERT(0 != decoder->protected_);
 553
 554         if(!FLAC__stream_decoder_flush(decoder)) {
 555                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 556                 return false;
 557         }
 558         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
 559
 560         decoder->private_->samples_decoded = 0;
 561
 562         return true;
 563 }
 564
 565 FLAC_API FLAC__bool FLAC__stream_decoder_process_single(FLAC__StreamDecoder *decoder)
 566 {
 567         FLAC__bool got_a_frame;
 568         FLAC__ASSERT(0 != decoder);
 569         FLAC__ASSERT(0 != decoder->protected_);
 570
 571         while(1) {
 572                 switch(decoder->protected_->state) {
 573                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
 574                                 if(!find_metadata_(decoder))
 575                                         return false; /* above function sets the status for us */
 576                                 break;
 577                         case FLAC__STREAM_DECODER_READ_METADATA:
 578                                 if(!read_metadata_(decoder))
 579                                         return false; /* above function sets the status for us */
 580                                 else
 581                                         return true;
 582                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 583                                 if(!frame_sync_(decoder))
 584                                         return true; /* above function sets the status for us */
 585                                 break;
 586                         case FLAC__STREAM_DECODER_READ_FRAME:
 587                                 if(!read_frame_(decoder, &got_a_frame))
 588                                         return false; /* above function sets the status for us */
 589                                 if(got_a_frame)
 590                                         return true; /* above function sets the status for us */
 591                                 break;
 592                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 593                         case FLAC__STREAM_DECODER_ABORTED:
 594                                 return true;
 595                         default:
 596                                 FLAC__ASSERT(0);
 597                                 return false;
 598                 }
 599         }
 600 }
 601
 602 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder *decoder)
 603 {
 604         FLAC__ASSERT(0 != decoder);
 605         FLAC__ASSERT(0 != decoder->protected_);
 606
 607         while(1) {
 608                 switch(decoder->protected_->state) {
 609                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
 610                                 if(!find_metadata_(decoder))
 611                                         return false; /* above function sets the status for us */
 612                                 break;
 613                         case FLAC__STREAM_DECODER_READ_METADATA:
 614                                 if(!read_metadata_(decoder))
 615                                         return false; /* above function sets the status for us */
 616                                 break;
 617                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 618                         case FLAC__STREAM_DECODER_READ_FRAME:
 619                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 620                         case FLAC__STREAM_DECODER_ABORTED:
 621                                 return true;
 622                         default:
 623                                 FLAC__ASSERT(0);
 624                                 return false;
 625                 }
 626         }
 627 }
 628
 629 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder *decoder)
 630 {
 631         FLAC__bool dummy;
 632         FLAC__ASSERT(0 != decoder);
 633         FLAC__ASSERT(0 != decoder->protected_);
 634
 635         while(1) {
 636                 switch(decoder->protected_->state) {
 637                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
 638                                 if(!find_metadata_(decoder))
 639                                         return false; /* above function sets the status for us */
 640                                 break;
 641                         case FLAC__STREAM_DECODER_READ_METADATA:
 642                                 if(!read_metadata_(decoder))
 643                                         return false; /* above function sets the status for us */
 644                                 break;
 645                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 646                                 if(!frame_sync_(decoder))
 647                                         return true; /* above function sets the status for us */
 648                                 break;
 649                         case FLAC__STREAM_DECODER_READ_FRAME:
 650                                 if(!read_frame_(decoder, &dummy))
 651                                         return false; /* above function sets the status for us */
 652                                 break;
 653                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 654                         case FLAC__STREAM_DECODER_ABORTED:
 655                                 return true;
 656                         default:
 657                                 FLAC__ASSERT(0);
 658                                 return false;
 659                 }
 660         }
 661 }
 662
 663 /***********************************************************************
 664  *
 665  * Protected class methods
 666  *
 667  ***********************************************************************/
 668
 669 unsigned FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder)
 670 {
 671         FLAC__ASSERT(0 != decoder);
 672         return FLAC__bitbuffer_get_input_bytes_unconsumed(decoder->private_->input);
 673 }
 674
 675 /***********************************************************************
 676  *
 677  * Private class methods
 678  *
 679  ***********************************************************************/
 680
 681 void set_defaults_(FLAC__StreamDecoder *decoder)
 682 {
 683         decoder->private_->read_callback = 0;
 684         decoder->private_->write_callback = 0;
 685         decoder->private_->metadata_callback = 0;
 686         decoder->private_->error_callback = 0;
 687         decoder->private_->client_data = 0;
 688
 689         memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
 690         decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] = true;
 691         decoder->private_->metadata_filter_ids_count = 0;
 692 }
 693
 694 FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels)
 695 {
 696         unsigned i;
 697         FLAC__int32 *tmp;
 698
 699         if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels)
 700                 return true;
 701
 702         /* simply using realloc() is not practical because the number of channels may change mid-stream */
 703
 704         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 705                 if(0 != decoder->private_->output[i]) {
 706                         free(decoder->private_->output[i]-4);
 707                         decoder->private_->output[i] = 0;
 708                 }
 709                 if(0 != decoder->private_->residual[i]) {
 710                         free(decoder->private_->residual[i]);
 711                         decoder->private_->residual[i] = 0;
 712                 }
 713         }
 714
 715         for(i = 0; i < channels; i++) {
 716                 /* WATCHOUT:
 717                  * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the
 718                  * output arrays have a buffer of up to 3 zeroes in front
 719                  * (at negative indices) for alignment purposes; we use 4
 720                  * to keep the data well-aligned.
 721                  */
 722                 tmp = (FLAC__int32*)malloc(sizeof(FLAC__int32)*(size+4));
 723                 if(tmp == 0) {
 724                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 725                         return false;
 726                 }
 727                 memset(tmp, 0, sizeof(FLAC__int32)*4);
 728                 decoder->private_->output[i] = tmp + 4;
 729
 730                 tmp = (FLAC__int32*)malloc(sizeof(FLAC__int32)*size);
 731                 if(tmp == 0) {
 732                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 733                         return false;
 734                 }
 735                 decoder->private_->residual[i] = tmp;
 736         }
 737
 738         decoder->private_->output_capacity = size;
 739         decoder->private_->output_channels = channels;
 740
 741         return true;
 742 }
 743
 744 FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id)
 745 {
 746         unsigned i;
 747
 748         FLAC__ASSERT(0 != decoder);
 749         FLAC__ASSERT(0 != decoder->private_);
 750
 751         for(i = 0; i < decoder->private_->metadata_filter_ids_count; i++)
 752                 if(0 == memcmp(decoder->private_->metadata_filter_ids + i * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)))
 753                         return true;
 754
 755         return false;
 756 }
 757
 758 FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder)
 759 {
 760         FLAC__uint32 x;
 761         unsigned i, id;
 762         FLAC__bool first = true;
 763
 764         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
 765
 766         for(i = id = 0; i < 4; ) {
 767                 if(decoder->private_->cached) {
 768                         x = (FLAC__uint32)decoder->private_->lookahead;
 769                         decoder->private_->cached = false;
 770                 }
 771                 else {
 772                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
 773                                 return false; /* the read_callback_ sets the state for us */
 774                 }
 775                 if(x == FLAC__STREAM_SYNC_STRING[i]) {
 776                         first = true;
 777                         i++;
 778                         id = 0;
 779                         continue;
 780                 }
 781                 if(x == ID3V2_TAG_[id]) {
 782                         id++;
 783                         i = 0;
 784                         if(id == 3) {
 785                                 if(!skip_id3v2_tag_(decoder))
 786                                         return false; /* the read_callback_ sets the state for us */
 787                         }
 788                         continue;
 789                 }
 790                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 791                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
 792                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
 793                                 return false; /* the read_callback_ sets the state for us */
 794
 795                         /* we have to check if we just read two 0xff's in a row; the second may actually be the beginning of the sync code */
 796                         /* else we have to check if the second byte is the end of a sync code */
 797                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 798                                 decoder->private_->lookahead = (FLAC__byte)x;
 799                                 decoder->private_->cached = true;
 800                         }
 801                         else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
 802                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
 803                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
 804                                 return true;
 805                         }
 806                 }
 807                 i = 0;
 808                 if(first) {
 809                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
 810                         first = false;
 811                 }
 812         }
 813
 814         decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA;
 815         return true;
 816 }
 817
 818 FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder)
 819 {
 820         FLAC__bool is_last;
 821         FLAC__uint32 i, x, type, length;
 822
 823         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
 824
 825         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_IS_LAST_LEN, read_callback_, decoder))
 826                 return false; /* the read_callback_ sets the state for us */
 827         is_last = x? true : false;
 828
 829         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN, read_callback_, decoder))
 830                 return false; /* the read_callback_ sets the state for us */
 831
 832         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN, read_callback_, decoder))
 833                 return false; /* the read_callback_ sets the state for us */
 834
 835         if(type == FLAC__METADATA_TYPE_STREAMINFO) {
 836                 if(!read_metadata_streaminfo_(decoder, is_last, length))
 837                         return false;
 838
 839                 decoder->private_->has_stream_info = true;
 840                 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO])
 841                         decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data);
 842         }
 843         else if(type == FLAC__METADATA_TYPE_SEEKTABLE) {
 844                 if(!read_metadata_seektable_(decoder, is_last, length))
 845                         return false;
 846
 847                 decoder->private_->has_seek_table = true;
 848                 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_SEEKTABLE])
 849                         decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data);
 850         }
 851         else {
 852                 FLAC__bool skip_it = !decoder->private_->metadata_filter[type];
 853                 unsigned real_length = length;
 854                 FLAC__StreamMetadata block;
 855
 856                 block.is_last = is_last;
 857                 block.type = (FLAC__MetadataType)type;
 858                 block.length = length;
 859
 860                 if(type == FLAC__METADATA_TYPE_APPLICATION) {
 861                         if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8, read_callback_, decoder))
 862                                 return false; /* the read_callback_ sets the state for us */
 863
 864                         real_length -= FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8;
 865
 866                         if(decoder->private_->metadata_filter_ids_count > 0 && has_id_filtered_(decoder, block.data.application.id))
 867                                 skip_it = !skip_it;
 868                 }
 869
 870                 if(skip_it) {
 871                         if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, 0, real_length, read_callback_, decoder))
 872                                 return false; /* the read_callback_ sets the state for us */
 873                 }
 874                 else {
 875                         switch(type) {
 876                                 case FLAC__METADATA_TYPE_PADDING:
 877                                         /* skip the padding bytes */
 878                                         if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, 0, real_length, read_callback_, decoder))
 879                                                 return false; /* the read_callback_ sets the state for us */
 880                                         break;
 881                                 case FLAC__METADATA_TYPE_APPLICATION:
 882                                         /* remember, we read the ID already */
 883                                         if(real_length > 0) {
 884                                                 if(0 == (block.data.application.data = (FLAC__byte*)malloc(real_length))) {
 885                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 886                                                         return false;
 887                                                 }
 888                                                 if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.data, real_length, read_callback_, decoder))
 889                                                         return false; /* the read_callback_ sets the state for us */
 890                                         }
 891                                         else
 892                                                 block.data.application.data = 0;
 893                                         break;
 894                                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 895                                         if(!read_metadata_vorbiscomment_(decoder, &block.data.vorbis_comment))
 896                                                 return false;
 897                                         break;
 898                                 case FLAC__METADATA_TYPE_CUESHEET:
 899                                         if(!read_metadata_cuesheet_(decoder, &block.data.cue_sheet))
 900                                                 return false;
 901                                         break;
 902                                 case FLAC__METADATA_TYPE_STREAMINFO:
 903                                 case FLAC__METADATA_TYPE_SEEKTABLE:
 904                                 default:
 905                                         FLAC__ASSERT(0);
 906                         }
 907                         decoder->private_->metadata_callback(decoder, &block, decoder->private_->client_data);
 908
 909                         /* now we have to free any malloc'ed data in the block */
 910                         switch(type) {
 911                                 case FLAC__METADATA_TYPE_PADDING:
 912                                         break;
 913                                 case FLAC__METADATA_TYPE_APPLICATION:
 914                                         if(0 != block.data.application.data)
 915                                                 free(block.data.application.data);
 916                                         break;
 917                                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 918                                         if(0 != block.data.vorbis_comment.vendor_string.entry)
 919                                                 free(block.data.vorbis_comment.vendor_string.entry);
 920                                         if(block.data.vorbis_comment.num_comments > 0)
 921                                                 for(i = 0; i < block.data.vorbis_comment.num_comments; i++)
 922                                                         if(0 != block.data.vorbis_comment.comments[i].entry)
 923                                                                 free(block.data.vorbis_comment.comments[i].entry);
 924                                         if(0 != block.data.vorbis_comment.comments)
 925                                                 free(block.data.vorbis_comment.comments);
 926                                         break;
 927                                 case FLAC__METADATA_TYPE_CUESHEET:
 928                                         if(block.data.cue_sheet.num_tracks > 0)
 929                                                 for(i = 0; i < block.data.cue_sheet.num_tracks; i++)
 930                                                         if(0 != block.data.cue_sheet.tracks[i].indices)
 931                                                                 free(block.data.cue_sheet.tracks[i].indices);
 932                                         if(0 != block.data.cue_sheet.tracks)
 933                                                 free(block.data.cue_sheet.tracks);
 934                                         break;
 935                                 case FLAC__METADATA_TYPE_STREAMINFO:
 936                                 case FLAC__METADATA_TYPE_SEEKTABLE:
 937                                 default:
 938                                         FLAC__ASSERT(0);
 939                         }
 940                 }
 941         }
 942
 943         if(is_last)
 944                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 945
 946         return true;
 947 }
 948
 949 FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length)
 950 {
 951         FLAC__uint32 x;
 952         unsigned bits, used_bits = 0;
 953
 954         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
 955
 956         decoder->private_->stream_info.type = FLAC__METADATA_TYPE_STREAMINFO;
 957         decoder->private_->stream_info.is_last = is_last;
 958         decoder->private_->stream_info.length = length;
 959
 960         bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN;
 961         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, bits, read_callback_, decoder))
 962                 return false; /* the read_callback_ sets the state for us */
 963         decoder->private_->stream_info.data.stream_info.min_blocksize = x;
 964         used_bits += bits;
 965
 966         bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN;
 967         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN, read_callback_, decoder))
 968                 return false; /* the read_callback_ sets the state for us */
 969         decoder->private_->stream_info.data.stream_info.max_blocksize = x;
 970         used_bits += bits;
 971
 972         bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN;
 973         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN, read_callback_, decoder))
 974                 return false; /* the read_callback_ sets the state for us */
 975         decoder->private_->stream_info.data.stream_info.min_framesize = x;
 976         used_bits += bits;
 977
 978         bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN;
 979         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN, read_callback_, decoder))
 980                 return false; /* the read_callback_ sets the state for us */
 981         decoder->private_->stream_info.data.stream_info.max_framesize = x;
 982         used_bits += bits;
 983
 984         bits = FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN;
 985         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN, read_callback_, decoder))
 986                 return false; /* the read_callback_ sets the state for us */
 987         decoder->private_->stream_info.data.stream_info.sample_rate = x;
 988         used_bits += bits;
 989
 990         bits = FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN;
 991         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN, read_callback_, decoder))
 992                 return false; /* the read_callback_ sets the state for us */
 993         decoder->private_->stream_info.data.stream_info.channels = x+1;
 994         used_bits += bits;
 995
 996         bits = FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN;
 997         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN, read_callback_, decoder))
 998                 return false; /* the read_callback_ sets the state for us */
 999         decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1;
1000         used_bits += bits;
1001
1002         bits = FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN;
1003         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))
1004                 return false; /* the read_callback_ sets the state for us */
1005         used_bits += bits;
1006
1007         if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, decoder->private_->stream_info.data.stream_info.md5sum, 16, read_callback_, decoder))
1008                 return false; /* the read_callback_ sets the state for us */
1009         used_bits += 16*8;
1010
1011         /* skip the rest of the block */
1012         FLAC__ASSERT(used_bits % 8 == 0);
1013         length -= (used_bits / 8);
1014         if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, 0, length, read_callback_, decoder))
1015                 return false; /* the read_callback_ sets the state for us */
1016
1017         return true;
1018 }
1019
1020 FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length)
1021 {
1022         FLAC__uint32 i, x;
1023         FLAC__uint64 xx;
1024
1025         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
1026
1027         decoder->private_->seek_table.type = FLAC__METADATA_TYPE_SEEKTABLE;
1028         decoder->private_->seek_table.is_last = is_last;
1029         decoder->private_->seek_table.length = length;
1030
1031         decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
1032
1033         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)))) {
1034                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1035                 return false;
1036         }
1037         for(i = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) {
1038                 if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN, read_callback_, decoder))
1039                         return false; /* the read_callback_ sets the state for us */
1040                 decoder->private_->seek_table.data.seek_table.points[i].sample_number = xx;
1041
1042                 if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN, read_callback_, decoder))
1043                         return false; /* the read_callback_ sets the state for us */
1044                 decoder->private_->seek_table.data.seek_table.points[i].stream_offset = xx;
1045
1046                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN, read_callback_, decoder))
1047                         return false; /* the read_callback_ sets the state for us */
1048                 decoder->private_->seek_table.data.seek_table.points[i].frame_samples = x;
1049         }
1050         length -= (decoder->private_->seek_table.data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH);
1051         /* if there is a partial point left, skip over it */
1052         if(length > 0) {
1053                 /*@@@ do an error_callback() here?  there's an argument for either way */
1054                 if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, 0, length, read_callback_, decoder))
1055                         return false; /* the read_callback_ sets the state for us */
1056         }
1057
1058         return true;
1059 }
1060
1061 FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj)
1062 {
1063         FLAC__uint32 i;
1064
1065         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
1066
1067         /* read vendor string */
1068         FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1069         if(!FLAC__bitbuffer_read_raw_uint32_little_endian(decoder->private_->input, &obj->vendor_string.length, read_callback_, decoder))
1070                 return false; /* the read_callback_ sets the state for us */
1071         if(obj->vendor_string.length > 0) {
1072                 if(0 == (obj->vendor_string.entry = (FLAC__byte*)malloc(obj->vendor_string.length))) {
1073                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1074                         return false;
1075                 }
1076                 if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, obj->vendor_string.entry, obj->vendor_string.length, read_callback_, decoder))
1077                         return false; /* the read_callback_ sets the state for us */
1078         }
1079         else
1080                 obj->vendor_string.entry = 0;
1081
1082         /* read num comments */
1083         FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN == 32);
1084         if(!FLAC__bitbuffer_read_raw_uint32_little_endian(decoder->private_->input, &obj->num_comments, read_callback_, decoder))
1085                 return false; /* the read_callback_ sets the state for us */
1086
1087         /* read comments */
1088         if(obj->num_comments > 0) {
1089                 if(0 == (obj->comments = (FLAC__StreamMetadata_VorbisComment_Entry*)malloc(obj->num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) {
1090                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1091                         return false;
1092                 }
1093                 for(i = 0; i < obj->num_comments; i++) {
1094                         FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1095                         if(!FLAC__bitbuffer_read_raw_uint32_little_endian(decoder->private_->input, &obj->comments[i].length, read_callback_, decoder))
1096                                 return false; /* the read_callback_ sets the state for us */
1097                         if(obj->comments[i].length > 0) {
1098                                 if(0 == (obj->comments[i].entry = (FLAC__byte*)malloc(obj->comments[i].length))) {
1099                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1100                                         return false;
1101                                 }
1102                                 if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, obj->comments[i].entry, obj->comments[i].length, read_callback_, decoder))
1103                                         return false; /* the read_callback_ sets the state for us */
1104                         }
1105                         else
1106                                 obj->comments[i].entry = 0;
1107                 }
1108         }
1109         else {
1110                 obj->comments = 0;
1111         }
1112
1113         return true;
1114 }
1115
1116 FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj)
1117 {
1118         FLAC__uint32 i, j, x;
1119
1120         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
1121
1122         memset(obj, 0, sizeof(FLAC__StreamMetadata_CueSheet));
1123
1124         FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
1125         if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, obj->media_catalog_number, FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN/8, read_callback_, decoder))
1126                 return false; /* the read_callback_ sets the state for us */
1127
1128         if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &obj->lead_in, FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN, read_callback_, decoder))
1129                 return false; /* the read_callback_ sets the state for us */
1130
1131         if(!FLAC__bitbuffer_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN, read_callback_, decoder))
1132                 return false; /* the read_callback_ sets the state for us */
1133
1134         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN, read_callback_, decoder))
1135                 return false; /* the read_callback_ sets the state for us */
1136         obj->num_tracks = x;
1137
1138         if(obj->num_tracks > 0) {
1139                 if(0 == (obj->tracks = (FLAC__StreamMetadata_CueSheet_Track*)calloc(obj->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track)))) {
1140                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1141                         return false;
1142                 }
1143                 for(i = 0; i < obj->num_tracks; i++) {
1144                         FLAC__StreamMetadata_CueSheet_Track *track = &obj->tracks[i];
1145                         if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &track->offset, FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN, read_callback_, decoder))
1146                                 return false; /* the read_callback_ sets the state for us */
1147
1148                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN, read_callback_, decoder))
1149                                 return false; /* the read_callback_ sets the state for us */
1150                         track->number = (FLAC__byte)x;
1151
1152                         FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
1153                         if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, track->isrc, FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN/8, read_callback_, decoder))
1154                                 return false; /* the read_callback_ sets the state for us */
1155
1156                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN, read_callback_, decoder))
1157                                 return false; /* the read_callback_ sets the state for us */
1158                         track->type = x;
1159
1160                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN, read_callback_, decoder))
1161                                 return false; /* the read_callback_ sets the state for us */
1162                         track->pre_emphasis = x;
1163
1164                         if(!FLAC__bitbuffer_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN, read_callback_, decoder))
1165                                 return false; /* the read_callback_ sets the state for us */
1166
1167                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN, read_callback_, decoder))
1168                                 return false; /* the read_callback_ sets the state for us */
1169                         track->num_indices = (FLAC__byte)x;
1170
1171                         if(track->num_indices > 0) {
1172                                 if(0 == (track->indices = (FLAC__StreamMetadata_CueSheet_Index*)calloc(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index)))) {
1173                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1174                                         return false;
1175                                 }
1176                                 for(j = 0; j < track->num_indices; j++) {
1177                                         FLAC__StreamMetadata_CueSheet_Index *index = &track->indices[j];
1178                                         if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &index->offset, FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN, read_callback_, decoder))
1179                                                 return false; /* the read_callback_ sets the state for us */
1180
1181                                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN, read_callback_, decoder))
1182                                                 return false; /* the read_callback_ sets the state for us */
1183                                         index->number = (FLAC__byte)x;
1184
1185                                         if(!FLAC__bitbuffer_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN, read_callback_, decoder))
1186                                                 return false; /* the read_callback_ sets the state for us */
1187                                 }
1188                         }
1189                 }
1190         }
1191
1192         return true;
1193 }
1194
1195 FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder)
1196 {
1197         FLAC__uint32 x;
1198         unsigned i, skip;
1199
1200         /* skip the version and flags bytes */
1201         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 24, read_callback_, decoder))
1202                 return false; /* the read_callback_ sets the state for us */
1203         /* get the size (in bytes) to skip */
1204         skip = 0;
1205         for(i = 0; i < 4; i++) {
1206                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1207                         return false; /* the read_callback_ sets the state for us */
1208                 skip <<= 7;
1209                 skip |= (x & 0x7f);
1210         }
1211         /* skip the rest of the tag */
1212         if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, 0, skip, read_callback_, decoder))
1213                 return false; /* the read_callback_ sets the state for us */
1214         return true;
1215 }
1216
1217 FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder)
1218 {
1219         FLAC__uint32 x;
1220         FLAC__bool first = true;
1221
1222         /* If we know the total number of samples in the stream, stop if we've read that many. */
1223         /* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */
1224         if(decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.total_samples) {
1225                 if(decoder->private_->samples_decoded >= decoder->private_->stream_info.data.stream_info.total_samples) {
1226                         decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1227                         return true;
1228                 }
1229         }
1230
1231         /* make sure we're byte aligned */
1232         if(!FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input)) {
1233                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__bitbuffer_bits_left_for_byte_alignment(decoder->private_->input), read_callback_, decoder))
1234                         return false; /* the read_callback_ sets the state for us */
1235         }
1236
1237         while(1) {
1238                 if(decoder->private_->cached) {
1239                         x = (FLAC__uint32)decoder->private_->lookahead;
1240                         decoder->private_->cached = false;
1241                 }
1242                 else {
1243                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1244                                 return false; /* the read_callback_ sets the state for us */
1245                 }
1246                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1247                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
1248                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1249                                 return false; /* the read_callback_ sets the state for us */
1250
1251                         /* 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 */
1252                         /* else we have to check if the second byte is the end of a sync code */
1253                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1254                                 decoder->private_->lookahead = (FLAC__byte)x;
1255                                 decoder->private_->cached = true;
1256                         }
1257                         else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
1258                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
1259                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
1260                                 return true;
1261                         }
1262                 }
1263                 if(first) {
1264                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1265                         first = false;
1266                 }
1267         }
1268
1269         return true;
1270 }
1271
1272 FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame)
1273 {
1274         unsigned channel;
1275         unsigned i;
1276         FLAC__int32 mid, side, left, right;
1277         FLAC__uint16 frame_crc; /* the one we calculate from the input stream */
1278         FLAC__uint32 x;
1279
1280         *got_a_frame = false;
1281
1282         /* init the CRC */
1283         frame_crc = 0;
1284         FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc);
1285         FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc);
1286         FLAC__bitbuffer_reset_read_crc16(decoder->private_->input, frame_crc);
1287
1288         if(!read_frame_header_(decoder))
1289                 return false;
1290         if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC)
1291                 return true;
1292         if(!allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels))
1293                 return false;
1294         for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
1295                 /*
1296                  * first figure the correct bits-per-sample of the subframe
1297                  */
1298                 unsigned bps = decoder->private_->frame.header.bits_per_sample;
1299                 switch(decoder->private_->frame.header.channel_assignment) {
1300                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1301                                 /* no adjustment needed */
1302                                 break;
1303                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1304                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1305                                 if(channel == 1)
1306                                         bps++;
1307                                 break;
1308                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1309                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1310                                 if(channel == 0)
1311                                         bps++;
1312                                 break;
1313                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1314                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1315                                 if(channel == 1)
1316                                         bps++;
1317                                 break;
1318                         default:
1319                                 FLAC__ASSERT(0);
1320                 }
1321                 /*
1322                  * now read it
1323                  */
1324                 if(!read_subframe_(decoder, channel, bps))
1325                         return false;
1326                 if(decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME) {
1327                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1328                         return true;
1329                 }
1330         }
1331         if(!read_zero_padding_(decoder))
1332                 return false;
1333
1334         /*
1335          * Read the frame CRC-16 from the footer and check
1336          */
1337         frame_crc = FLAC__bitbuffer_get_read_crc16(decoder->private_->input);
1338         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN, read_callback_, decoder))
1339                 return false; /* the read_callback_ sets the state for us */
1340         if(frame_crc == (FLAC__uint16)x) {
1341                 /* Undo any special channel coding */
1342                 switch(decoder->private_->frame.header.channel_assignment) {
1343                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1344                                 /* do nothing */
1345                                 break;
1346                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1347                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1348                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1349                                         decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i];
1350                                 break;
1351                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1352                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1353                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1354                                         decoder->private_->output[0][i] += decoder->private_->output[1][i];
1355                                 break;
1356                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1357                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1358                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
1359                                         mid = decoder->private_->output[0][i];
1360                                         side = decoder->private_->output[1][i];
1361                                         mid <<= 1;
1362                                         if(side & 1) /* i.e. if 'side' is odd... */
1363                                                 mid++;
1364                                         left = mid + side;
1365                                         right = mid - side;
1366                                         decoder->private_->output[0][i] = left >> 1;
1367                                         decoder->private_->output[1][i] = right >> 1;
1368                                 }
1369                                 break;
1370                         default:
1371                                 FLAC__ASSERT(0);
1372                                 break;
1373                 }
1374         }
1375         else {
1376                 /* Bad frame, emit error and zero the output signal */
1377                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH, decoder->private_->client_data);
1378                 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
1379                         memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
1380                 }
1381         }
1382
1383         *got_a_frame = true;
1384
1385         /* put the latest values into the public section of the decoder instance */
1386         decoder->protected_->channels = decoder->private_->frame.header.channels;
1387         decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment;
1388         decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample;
1389         decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate;
1390         decoder->protected_->blocksize = decoder->private_->frame.header.blocksize;
1391
1392         FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
1393         decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize;
1394
1395         /* write it */
1396         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)
1397                 return false;
1398
1399         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1400         return true;
1401 }
1402
1403 FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder)
1404 {
1405         FLAC__uint32 x;
1406         FLAC__uint64 xx;
1407         unsigned i, blocksize_hint = 0, sample_rate_hint = 0;
1408         FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */
1409         unsigned raw_header_len;
1410         FLAC__bool is_unparseable = false;
1411         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);
1412         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);
1413
1414         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
1415
1416         /* init the raw header with the saved bits from synchronization */
1417         raw_header[0] = decoder->private_->header_warmup[0];
1418         raw_header[1] = decoder->private_->header_warmup[1];
1419         raw_header_len = 2;
1420
1421         /*
1422          * check to make sure that the reserved bits are 0
1423          */
1424         if(raw_header[1] & 0x03) { /* MAGIC NUMBER */
1425                 is_unparseable = true;
1426         }
1427
1428         /*
1429          * Note that along the way as we read the header, we look for a sync
1430          * code inside.  If we find one it would indicate that our original
1431          * sync was bad since there cannot be a sync code in a valid header.
1432          */
1433
1434         /*
1435          * read in the raw header as bytes so we can CRC it, and parse it on the way
1436          */
1437         for(i = 0; i < 2; i++) {
1438                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1439                         return false; /* the read_callback_ sets the state for us */
1440                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1441                         /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */
1442                         decoder->private_->lookahead = (FLAC__byte)x;
1443                         decoder->private_->cached = true;
1444                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1445                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1446                         return true;
1447                 }
1448                 raw_header[raw_header_len++] = (FLAC__byte)x;
1449         }
1450
1451         switch(x = raw_header[2] >> 4) {
1452                 case 0:
1453                         if(is_known_fixed_blocksize_stream)
1454                                 decoder->private_->frame.header.blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize;
1455                         else
1456                                 is_unparseable = true;
1457                         break;
1458                 case 1:
1459                         decoder->private_->frame.header.blocksize = 192;
1460                         break;
1461                 case 2:
1462                 case 3:
1463                 case 4:
1464                 case 5:
1465                         decoder->private_->frame.header.blocksize = 576 << (x-2);
1466                         break;
1467                 case 6:
1468                 case 7:
1469                         blocksize_hint = x;
1470                         break;
1471                 case 8:
1472                 case 9:
1473                 case 10:
1474                 case 11:
1475                 case 12:
1476                 case 13:
1477                 case 14:
1478                 case 15:
1479                         decoder->private_->frame.header.blocksize = 256 << (x-8);
1480                         break;
1481                 default:
1482                         FLAC__ASSERT(0);
1483                         break;
1484         }
1485
1486         switch(x = raw_header[2] & 0x0f) {
1487                 case 0:
1488                         if(decoder->private_->has_stream_info)
1489                                 decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate;
1490                         else
1491                                 is_unparseable = true;
1492                         break;
1493                 case 1:
1494                 case 2:
1495                 case 3:
1496                         is_unparseable = true;
1497                         break;
1498                 case 4:
1499                         decoder->private_->frame.header.sample_rate = 8000;
1500                         break;
1501                 case 5:
1502                         decoder->private_->frame.header.sample_rate = 16000;
1503                         break;
1504                 case 6:
1505                         decoder->private_->frame.header.sample_rate = 22050;
1506                         break;
1507                 case 7:
1508                         decoder->private_->frame.header.sample_rate = 24000;
1509                         break;
1510                 case 8:
1511                         decoder->private_->frame.header.sample_rate = 32000;
1512                         break;
1513                 case 9:
1514                         decoder->private_->frame.header.sample_rate = 44100;
1515                         break;
1516                 case 10:
1517                         decoder->private_->frame.header.sample_rate = 48000;
1518                         break;
1519                 case 11:
1520                         decoder->private_->frame.header.sample_rate = 96000;
1521                         break;
1522                 case 12:
1523                 case 13:
1524                 case 14:
1525                         sample_rate_hint = x;
1526                         break;
1527                 case 15:
1528                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1529                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1530                         return true;
1531                 default:
1532                         FLAC__ASSERT(0);
1533         }
1534
1535         x = (unsigned)(raw_header[3] >> 4);
1536         if(x & 8) {
1537                 decoder->private_->frame.header.channels = 2;
1538                 switch(x & 7) {
1539                         case 0:
1540                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE;
1541                                 break;
1542                         case 1:
1543                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE;
1544                                 break;
1545                         case 2:
1546                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE;
1547                                 break;
1548                         default:
1549                                 is_unparseable = true;
1550                                 break;
1551                 }
1552         }
1553         else {
1554                 decoder->private_->frame.header.channels = (unsigned)x + 1;
1555                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT;
1556         }
1557
1558         switch(x = (unsigned)(raw_header[3] & 0x0e) >> 1) {
1559                 case 0:
1560                         if(decoder->private_->has_stream_info)
1561                                 decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample;
1562                         else
1563                                 is_unparseable = true;
1564                         break;
1565                 case 1:
1566                         decoder->private_->frame.header.bits_per_sample = 8;
1567                         break;
1568                 case 2:
1569                         decoder->private_->frame.header.bits_per_sample = 12;
1570                         break;
1571                 case 4:
1572                         decoder->private_->frame.header.bits_per_sample = 16;
1573                         break;
1574                 case 5:
1575                         decoder->private_->frame.header.bits_per_sample = 20;
1576                         break;
1577                 case 6:
1578                         decoder->private_->frame.header.bits_per_sample = 24;
1579                         break;
1580                 case 3:
1581                 case 7:
1582                         is_unparseable = true;
1583                         break;
1584                 default:
1585                         FLAC__ASSERT(0);
1586                         break;
1587         }
1588
1589         if(raw_header[3] & 0x01) { /* this should be a zero padding bit */
1590                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1591                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1592                 return true;
1593         }
1594
1595         if(blocksize_hint && is_known_variable_blocksize_stream) {
1596                 if(!FLAC__bitbuffer_read_utf8_uint64(decoder->private_->input, &xx, read_callback_, decoder, raw_header, &raw_header_len))
1597                         return false; /* the read_callback_ sets the state for us */
1598                 if(xx == 0xffffffffffffffff) { /* i.e. non-UTF8 code... */
1599                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
1600                         decoder->private_->cached = true;
1601                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1602                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1603                         return true;
1604                 }
1605                 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
1606                 decoder->private_->frame.header.number.sample_number = xx;
1607         }
1608         else {
1609                 if(!FLAC__bitbuffer_read_utf8_uint32(decoder->private_->input, &x, read_callback_, decoder, raw_header, &raw_header_len))
1610                         return false; /* the read_callback_ sets the state for us */
1611                 if(x == 0xffffffff) { /* i.e. non-UTF8 code... */
1612                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
1613                         decoder->private_->cached = true;
1614                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1615                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1616                         return true;
1617                 }
1618                 decoder->private_->last_frame_number = x;
1619                 if(decoder->private_->has_stream_info) {
1620                         decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
1621                         decoder->private_->frame.header.number.sample_number = (FLAC__int64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__int64)x;
1622                 }
1623                 else {
1624                         is_unparseable = true;
1625                 }
1626         }
1627
1628         if(blocksize_hint) {
1629                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1630                         return false; /* the read_callback_ sets the state for us */
1631                 raw_header[raw_header_len++] = (FLAC__byte)x;
1632                 if(blocksize_hint == 7) {
1633                         FLAC__uint32 _x;
1634                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &_x, 8, read_callback_, decoder))
1635                                 return false; /* the read_callback_ sets the state for us */
1636                         raw_header[raw_header_len++] = (FLAC__byte)_x;
1637                         x = (x << 8) | _x;
1638                 }
1639                 decoder->private_->frame.header.blocksize = x+1;
1640         }
1641
1642         if(sample_rate_hint) {
1643                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1644                         return false; /* the read_callback_ sets the state for us */
1645                 raw_header[raw_header_len++] = (FLAC__byte)x;
1646                 if(sample_rate_hint != 12) {
1647                         FLAC__uint32 _x;
1648                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &_x, 8, read_callback_, decoder))
1649                                 return false; /* the read_callback_ sets the state for us */
1650                         raw_header[raw_header_len++] = (FLAC__byte)_x;
1651                         x = (x << 8) | _x;
1652                 }
1653                 if(sample_rate_hint == 12)
1654                         decoder->private_->frame.header.sample_rate = x*1000;
1655                 else if(sample_rate_hint == 13)
1656                         decoder->private_->frame.header.sample_rate = x;
1657                 else
1658                         decoder->private_->frame.header.sample_rate = x*10;
1659         }
1660
1661         /* read the CRC-8 byte */
1662         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1663                 return false; /* the read_callback_ sets the state for us */
1664         crc8 = (FLAC__byte)x;
1665
1666         if(FLAC__crc8(raw_header, raw_header_len) != crc8) {
1667                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1668                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1669                 return true;
1670         }
1671
1672         if(is_unparseable) {
1673                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1674                 return false;
1675         }
1676
1677         return true;
1678 }
1679
1680 FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1681 {
1682         FLAC__uint32 x;
1683         FLAC__bool wasted_bits;
1684
1685         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder)) /* MAGIC NUMBER */
1686                 return false; /* the read_callback_ sets the state for us */
1687
1688         wasted_bits = (x & 1);
1689         x &= 0xfe;
1690
1691         if(wasted_bits) {
1692                 unsigned u;
1693                 if(!FLAC__bitbuffer_read_unary_unsigned(decoder->private_->input, &u, read_callback_, decoder))
1694                         return false; /* the read_callback_ sets the state for us */
1695                 decoder->private_->frame.subframes[channel].wasted_bits = u+1;
1696                 bps -= decoder->private_->frame.subframes[channel].wasted_bits;
1697         }
1698         else
1699                 decoder->private_->frame.subframes[channel].wasted_bits = 0;
1700
1701         /*
1702          * Lots of magic numbers here
1703          */
1704         if(x & 0x80) {
1705                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1706                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1707                 return true;
1708         }
1709         else if(x == 0) {
1710                 if(!read_subframe_constant_(decoder, channel, bps))
1711                         return false;
1712         }
1713         else if(x == 2) {
1714                 if(!read_subframe_verbatim_(decoder, channel, bps))
1715                         return false;
1716         }
1717         else if(x < 16) {
1718                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1719                 return false;
1720         }
1721         else if(x <= 24) {
1722                 if(!read_subframe_fixed_(decoder, channel, bps, (x>>1)&7))
1723                         return false;
1724         }
1725         else if(x < 64) {
1726                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1727                 return false;
1728         }
1729         else {
1730                 if(!read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1))
1731                         return false;
1732         }
1733
1734         if(wasted_bits) {
1735                 unsigned i;
1736                 x = decoder->private_->frame.subframes[channel].wasted_bits;
1737                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1738                         decoder->private_->output[channel][i] <<= x;
1739         }
1740
1741         return true;
1742 }
1743
1744 FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1745 {
1746         FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant;
1747         FLAC__int32 x;
1748         unsigned i;
1749         FLAC__int32 *output = decoder->private_->output[channel];
1750
1751         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT;
1752
1753         if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &x, bps, read_callback_, decoder))
1754                 return false; /* the read_callback_ sets the state for us */
1755
1756         subframe->value = x;
1757
1758         /* decode the subframe */
1759         for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1760                 output[i] = x;
1761
1762         return true;
1763 }
1764
1765 FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order)
1766 {
1767         FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed;
1768         FLAC__int32 i32;
1769         FLAC__uint32 u32;
1770         unsigned u;
1771
1772         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED;
1773
1774         subframe->residual = decoder->private_->residual[channel];
1775         subframe->order = order;
1776
1777         /* read warm-up samples */
1778         for(u = 0; u < order; u++) {
1779                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, bps, read_callback_, decoder))
1780                         return false; /* the read_callback_ sets the state for us */
1781                 subframe->warmup[u] = i32;
1782         }
1783
1784         /* read entropy coding method info */
1785         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder))
1786                 return false; /* the read_callback_ sets the state for us */
1787         subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
1788         switch(subframe->entropy_coding_method.type) {
1789                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1790                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder))
1791                                 return false; /* the read_callback_ sets the state for us */
1792                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
1793                         subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
1794                         break;
1795                 default:
1796                         decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1797                         return false;
1798         }
1799
1800         /* read residual */
1801         switch(subframe->entropy_coding_method.type) {
1802                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1803                         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]))
1804                                 return false;
1805                         break;
1806                 default:
1807                         FLAC__ASSERT(0);
1808         }
1809
1810         /* decode the subframe */
1811         memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
1812         FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order);
1813
1814         return true;
1815 }
1816
1817 FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order)
1818 {
1819         FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc;
1820         FLAC__int32 i32;
1821         FLAC__uint32 u32;
1822         unsigned u;
1823
1824         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC;
1825
1826         subframe->residual = decoder->private_->residual[channel];
1827         subframe->order = order;
1828
1829         /* read warm-up samples */
1830         for(u = 0; u < order; u++) {
1831                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, bps, read_callback_, decoder))
1832                         return false; /* the read_callback_ sets the state for us */
1833                 subframe->warmup[u] = i32;
1834         }
1835
1836         /* read qlp coeff precision */
1837         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN, read_callback_, decoder))
1838                 return false; /* the read_callback_ sets the state for us */
1839         if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) {
1840                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1841                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1842                 return true;
1843         }
1844         subframe->qlp_coeff_precision = u32+1;
1845
1846         /* read qlp shift */
1847         if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN, read_callback_, decoder))
1848                 return false; /* the read_callback_ sets the state for us */
1849         subframe->quantization_level = i32;
1850
1851         /* read quantized lp coefficiencts */
1852         for(u = 0; u < order; u++) {
1853                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision, read_callback_, decoder))
1854                         return false; /* the read_callback_ sets the state for us */
1855                 subframe->qlp_coeff[u] = i32;
1856         }
1857
1858         /* read entropy coding method info */
1859         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder))
1860                 return false; /* the read_callback_ sets the state for us */
1861         subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
1862         switch(subframe->entropy_coding_method.type) {
1863                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1864                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder))
1865                                 return false; /* the read_callback_ sets the state for us */
1866                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
1867                         subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
1868                         break;
1869                 default:
1870                         decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1871                         return false;
1872         }
1873
1874         /* read residual */
1875         switch(subframe->entropy_coding_method.type) {
1876                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1877                         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]))
1878                                 return false;
1879                         break;
1880                 default:
1881                         FLAC__ASSERT(0);
1882         }
1883
1884         /* decode the subframe */
1885         memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
1886         if(bps + subframe->qlp_coeff_precision + FLAC__bitmath_ilog2(order) <= 32)
1887                 if(bps <= 16 && subframe->qlp_coeff_precision <= 16)
1888                         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);
1889                 else
1890                         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);
1891         else
1892                 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);
1893
1894         return true;
1895 }
1896
1897 FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1898 {
1899         FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim;
1900         FLAC__int32 x, *residual = decoder->private_->residual[channel];
1901         unsigned i;
1902
1903         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM;
1904
1905         subframe->data = residual;
1906
1907         for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
1908                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &x, bps, read_callback_, decoder))
1909                         return false; /* the read_callback_ sets the state for us */
1910                 residual[i] = x;
1911         }
1912
1913         /* decode the subframe */
1914         memcpy(decoder->private_->output[channel], subframe->data, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
1915
1916         return true;
1917 }
1918
1919 FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, unsigned partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual)
1920 {
1921         FLAC__uint32 rice_parameter;
1922         int i;
1923         unsigned partition, sample, u;
1924         const unsigned partitions = 1u << partition_order;
1925         const unsigned partition_samples = partition_order > 0? decoder->private_->frame.header.blocksize >> partition_order : decoder->private_->frame.header.blocksize - predictor_order;
1926
1927         if(!FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(partitioned_rice_contents, max(6, partition_order))) {
1928                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1929                 return false;
1930         }
1931
1932         sample = 0;
1933         for(partition = 0; partition < partitions; partition++) {
1934                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN, read_callback_, decoder))
1935                         return false; /* the read_callback_ sets the state for us */
1936                 partitioned_rice_contents->parameters[partition] = rice_parameter;
1937                 if(rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1938 #ifdef FLAC__SYMMETRIC_RICE
1939                         for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
1940                                 if(!FLAC__bitbuffer_read_symmetric_rice_signed(decoder->private_->input, &i, rice_parameter, read_callback_, decoder))
1941                                         return false; /* the read_callback_ sets the state for us */
1942                                 residual[sample] = i;
1943                         }
1944 #else
1945                         u = (partition_order == 0 || partition > 0)? partition_samples : partition_samples - predictor_order;
1946                         if(!FLAC__bitbuffer_read_rice_signed_block(decoder->private_->input, residual + sample, u, rice_parameter, read_callback_, decoder))
1947                                 return false; /* the read_callback_ sets the state for us */
1948                         sample += u;
1949 #endif
1950                 }
1951                 else {
1952                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN, read_callback_, decoder))
1953                                 return false; /* the read_callback_ sets the state for us */
1954                         partitioned_rice_contents->raw_bits[partition] = rice_parameter;
1955                         for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
1956                                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i, rice_parameter, read_callback_, decoder))
1957                                         return false; /* the read_callback_ sets the state for us */
1958                                 residual[sample] = i;
1959                         }
1960                 }
1961         }
1962
1963         return true;
1964 }
1965
1966 FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder)
1967 {
1968         if(!FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input)) {
1969                 FLAC__uint32 zero = 0;
1970                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &zero, FLAC__bitbuffer_bits_left_for_byte_alignment(decoder->private_->input), read_callback_, decoder))
1971                         return false; /* the read_callback_ sets the state for us */
1972                 if(zero != 0) {
1973                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1974                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1975                 }
1976         }
1977         return true;
1978 }
1979
1980 FLAC__bool read_callback_(FLAC__byte buffer[], unsigned *bytes, void *client_data)
1981 {
1982         FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data;
1983         FLAC__StreamDecoderReadStatus status;
1984
1985         status = decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data);
1986         if(status == FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM)
1987                 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1988         else if(status == FLAC__STREAM_DECODER_READ_STATUS_ABORT)
1989                 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
1990         return status == FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
1991 }