src/libFLAC/stream_decoder.c

   1 /* libFLAC - Free Lossless Audio Codec library
   2  * Copyright (C) 2000,2001,2002  Josh Coalson
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA  02111-1307, USA.
  18  */
  19
  20 #include <stdio.h>
  21 #include <stdlib.h> /* for malloc() */
  22 #include <string.h> /* for memset/memcpy() */
  23 #include "FLAC/assert.h"
  24 #include "protected/stream_decoder.h"
  25 #include "private/bitbuffer.h"
  26 #include "private/cpu.h"
  27 #include "private/crc.h"
  28 #include "private/fixed.h"
  29 #include "private/lpc.h"
  30
  31 /***********************************************************************
  32  *
  33  * Private static data
  34  *
  35  ***********************************************************************/
  36
  37 static FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' };
  38
  39 /***********************************************************************
  40  *
  41  * Private class method prototypes
  42  *
  43  ***********************************************************************/
  44
  45 static FLAC__bool stream_decoder_allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels);
  46 static FLAC__bool stream_decoder_has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id);
  47 static FLAC__bool stream_decoder_find_metadata_(FLAC__StreamDecoder *decoder);
  48 static FLAC__bool stream_decoder_read_metadata_(FLAC__StreamDecoder *decoder);
  49 static FLAC__bool stream_decoder_skip_id3v2_tag_(FLAC__StreamDecoder *decoder);
  50 static FLAC__bool stream_decoder_frame_sync_(FLAC__StreamDecoder *decoder);
  51 static FLAC__bool stream_decoder_read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame);
  52 static FLAC__bool stream_decoder_read_frame_header_(FLAC__StreamDecoder *decoder);
  53 static FLAC__bool stream_decoder_read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  54 static FLAC__bool stream_decoder_read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  55 static FLAC__bool stream_decoder_read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order);
  56 static FLAC__bool stream_decoder_read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order);
  57 static FLAC__bool stream_decoder_read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  58 static FLAC__bool stream_decoder_read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, FLAC__EntropyCodingMethod_PartitionedRice *partitioned_rice, FLAC__int32 *residual);
  59 static FLAC__bool stream_decoder_read_zero_padding_(FLAC__StreamDecoder *decoder);
  60 static FLAC__bool read_callback_(FLAC__byte buffer[], unsigned *bytes, void *client_data);
  61
  62 /***********************************************************************
  63  *
  64  * Private class data
  65  *
  66  ***********************************************************************/
  67
  68 typedef struct FLAC__StreamDecoderPrivate {
  69         FLAC__StreamDecoderReadStatus (*read_callback)(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data);
  70         FLAC__StreamDecoderWriteStatus (*write_callback)(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data);
  71         void (*metadata_callback)(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data);
  72         void (*error_callback)(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
  73         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[]);
  74         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[]);
  75         void *client_data;
  76         FLAC__BitBuffer *input;
  77         FLAC__int32 *output[FLAC__MAX_CHANNELS];
  78         FLAC__int32 *residual[FLAC__MAX_CHANNELS];
  79         unsigned output_capacity, output_channels;
  80         FLAC__uint32 last_frame_number;
  81         FLAC__uint64 samples_decoded;
  82         FLAC__bool has_stream_info, has_seek_table;
  83         FLAC__StreamMetaData stream_info;
  84         FLAC__StreamMetaData seek_table;
  85         FLAC__bool metadata_filter[FLAC__METADATA_TYPE_VORBIS_COMMENT+1];
  86         FLAC__byte *metadata_filter_ids;
  87         unsigned metadata_filter_ids_count, metadata_filter_ids_capacity; /* units for both are IDs, not bytes */
  88         FLAC__Frame frame;
  89         FLAC__bool cached; /* true if there is a byte in lookahead */
  90         FLAC__CPUInfo cpuinfo;
  91         FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */
  92         FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */
  93 } FLAC__StreamDecoderPrivate;
  94
  95 /***********************************************************************
  96  *
  97  * Public static class data
  98  *
  99  ***********************************************************************/
 100
 101 const char *FLAC__StreamDecoderStateString[] = {
 102         "FLAC__STREAM_DECODER_SEARCH_FOR_METADATA",
 103         "FLAC__STREAM_DECODER_READ_METADATA",
 104         "FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC",
 105         "FLAC__STREAM_DECODER_READ_FRAME",
 106         "FLAC__STREAM_DECODER_END_OF_STREAM",
 107         "FLAC__STREAM_DECODER_ABORTED",
 108         "FLAC__STREAM_DECODER_UNPARSEABLE_STREAM",
 109         "FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR",
 110         "FLAC__STREAM_DECODER_ALREADY_INITIALIZED",
 111         "FLAC__STREAM_DECODER_INVALID_CALLBACK",
 112         "FLAC__STREAM_DECODER_UNINITIALIZED"
 113 };
 114
 115 const char *FLAC__StreamDecoderReadStatusString[] = {
 116         "FLAC__STREAM_DECODER_READ_CONTINUE",
 117         "FLAC__STREAM_DECODER_READ_END_OF_STREAM",
 118         "FLAC__STREAM_DECODER_READ_ABORT"
 119 };
 120
 121 const char *FLAC__StreamDecoderWriteStatusString[] = {
 122         "FLAC__STREAM_DECODER_WRITE_CONTINUE",
 123         "FLAC__STREAM_DECODER_WRITE_ABORT"
 124 };
 125
 126 const char *FLAC__StreamDecoderErrorStatusString[] = {
 127         "FLAC__STREAM_DECODER_ERROR_LOST_SYNC",
 128         "FLAC__STREAM_DECODER_ERROR_BAD_HEADER",
 129         "FLAC__STREAM_DECODER_ERROR_FRAME_CRC_MISMATCH"
 130 };
 131
 132 /***********************************************************************
 133  *
 134  * Class constructor/destructor
 135  *
 136  ***********************************************************************/
 137 FLAC__StreamDecoder *FLAC__stream_decoder_new()
 138 {
 139         FLAC__StreamDecoder *decoder;
 140
 141         FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
 142
 143         decoder = (FLAC__StreamDecoder*)malloc(sizeof(FLAC__StreamDecoder));
 144         if(decoder == 0) {
 145                 return 0;
 146         }
 147         decoder->protected_ = (FLAC__StreamDecoderProtected*)malloc(sizeof(FLAC__StreamDecoderProtected));
 148         if(decoder->protected_ == 0) {
 149                 free(decoder);
 150                 return 0;
 151         }
 152         decoder->private_ = (FLAC__StreamDecoderPrivate*)malloc(sizeof(FLAC__StreamDecoderPrivate));
 153         if(decoder->private_ == 0) {
 154                 free(decoder->protected_);
 155                 free(decoder);
 156                 return 0;
 157         }
 158         decoder->private_->input = FLAC__bitbuffer_new();
 159         if(decoder->private_->input == 0) {
 160                 free(decoder->private_);
 161                 free(decoder->protected_);
 162                 free(decoder);
 163                 return 0;
 164         }
 165
 166         decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
 167
 168         decoder->private_->read_callback = 0;
 169         decoder->private_->write_callback = 0;
 170         decoder->private_->metadata_callback = 0;
 171         decoder->private_->error_callback = 0;
 172         decoder->private_->client_data = 0;
 173
 174         return decoder;
 175 }
 176
 177 void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder)
 178 {
 179         FLAC__ASSERT(decoder != 0);
 180         FLAC__ASSERT(decoder->protected_ != 0);
 181         FLAC__ASSERT(decoder->private_ != 0);
 182         FLAC__ASSERT(decoder->private_->input != 0);
 183
 184         FLAC__bitbuffer_delete(decoder->private_->input);
 185         free(decoder->private_);
 186         free(decoder->protected_);
 187         free(decoder);
 188 }
 189
 190 /***********************************************************************
 191  *
 192  * Public class methods
 193  *
 194  ***********************************************************************/
 195
 196 FLAC__StreamDecoderState FLAC__stream_decoder_init(FLAC__StreamDecoder *decoder)
 197 {
 198         unsigned i;
 199
 200         FLAC__ASSERT(decoder != 0);
 201
 202         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 203                 return decoder->protected_->state = FLAC__STREAM_DECODER_ALREADY_INITIALIZED;
 204
 205         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
 206
 207         if(0 == decoder->private_->read_callback || 0 == decoder->private_->write_callback || 0 == decoder->private_->metadata_callback || 0 == decoder->private_->error_callback)
 208                 return decoder->protected_->state = FLAC__STREAM_DECODER_INVALID_CALLBACK;
 209
 210         if(!FLAC__bitbuffer_init(decoder->private_->input))
 211                 return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 212
 213         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 214                 decoder->private_->output[i] = 0;
 215                 decoder->private_->residual[i] = 0;
 216         }
 217
 218         decoder->private_->output_capacity = 0;
 219         decoder->private_->output_channels = 0;
 220         decoder->private_->last_frame_number = 0;
 221         decoder->private_->samples_decoded = 0;
 222         decoder->private_->has_stream_info = false;
 223         decoder->private_->has_seek_table = false;
 224
 225         memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
 226         decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] = true;
 227         decoder->private_->metadata_filter_ids_capacity = 16;
 228         if(0 == (decoder->private_->metadata_filter_ids = malloc((FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) * decoder->private_->metadata_filter_ids_capacity))) {
 229                 decoder->private_->metadata_filter_ids_capacity = 0;
 230                 return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 231         }
 232         decoder->private_->metadata_filter_ids_count = 0;
 233
 234         decoder->private_->cached = false;
 235
 236         /*
 237          * get the CPU info and set the function pointers
 238          */
 239         FLAC__cpu_info(&decoder->private_->cpuinfo);
 240         /* first default to the non-asm routines */
 241         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal;
 242         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal;
 243         /* now override with asm where appropriate */
 244 #ifndef FLAC__NO_ASM
 245         if(decoder->private_->cpuinfo.use_asm) {
 246 #ifdef FLAC__CPU_IA32
 247                 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
 248 #ifdef FLAC__HAS_NASM
 249                 if(decoder->private_->cpuinfo.data.ia32.mmx) {
 250                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
 251                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32_mmx;
 252                 }
 253                 else {
 254                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
 255                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32;
 256                 }
 257 #endif
 258 #endif
 259         }
 260 #endif
 261
 262         return decoder->protected_->state;
 263 }
 264
 265 void FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder)
 266 {
 267         unsigned i;
 268         FLAC__ASSERT(decoder != 0);
 269         if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
 270                 return;
 271         if(decoder->private_->has_seek_table) {
 272                 free(decoder->private_->seek_table.data.seek_table.points);
 273                 decoder->private_->seek_table.data.seek_table.points = 0;
 274         }
 275         FLAC__bitbuffer_free(decoder->private_->input);
 276         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 277                 /* WATCHOUT: FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the output arrays have a buffer of up to 3 zeroes in front (at negative indices) for alignment purposes; we use 4 to keep the data well-aligned. */
 278                 if(decoder->private_->output[i] != 0) {
 279                         free(decoder->private_->output[i]-4);
 280                         decoder->private_->output[i] = 0;
 281                 }
 282                 if(decoder->private_->residual[i] != 0) {
 283                         free(decoder->private_->residual[i]);
 284                         decoder->private_->residual[i] = 0;
 285                 }
 286         }
 287         if(decoder->private_->metadata_filter_ids != 0) {
 288                 free(decoder->private_->metadata_filter_ids);
 289                 decoder->private_->metadata_filter_ids = 0;
 290         }
 291         decoder->private_->output_capacity = 0;
 292         decoder->private_->output_channels = 0;
 293         decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
 294 }
 295
 296 FLAC__bool FLAC__stream_decoder_set_read_callback(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderReadStatus (*value)(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data))
 297 {
 298         FLAC__ASSERT(decoder != 0);
 299         FLAC__ASSERT(decoder->private_ != 0);
 300         FLAC__ASSERT(decoder->protected_ != 0);
 301         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 302                 return false;
 303         decoder->private_->read_callback = value;
 304         return true;
 305 }
 306
 307 FLAC__bool FLAC__stream_decoder_set_write_callback(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderWriteStatus (*value)(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data))
 308 {
 309         FLAC__ASSERT(decoder != 0);
 310         FLAC__ASSERT(decoder->private_ != 0);
 311         FLAC__ASSERT(decoder->protected_ != 0);
 312         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 313                 return false;
 314         decoder->private_->write_callback = value;
 315         return true;
 316 }
 317
 318 FLAC__bool FLAC__stream_decoder_set_metadata_callback(const FLAC__StreamDecoder *decoder, void (*value)(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data))
 319 {
 320         FLAC__ASSERT(decoder != 0);
 321         FLAC__ASSERT(decoder->private_ != 0);
 322         FLAC__ASSERT(decoder->protected_ != 0);
 323         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 324                 return false;
 325         decoder->private_->metadata_callback = value;
 326         return true;
 327 }
 328
 329 FLAC__bool FLAC__stream_decoder_set_error_callback(const FLAC__StreamDecoder *decoder, void (*value)(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data))
 330 {
 331         FLAC__ASSERT(decoder != 0);
 332         FLAC__ASSERT(decoder->private_ != 0);
 333         FLAC__ASSERT(decoder->protected_ != 0);
 334         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 335                 return false;
 336         decoder->private_->error_callback = value;
 337         return true;
 338 }
 339
 340 FLAC__bool FLAC__stream_decoder_set_client_data(const FLAC__StreamDecoder *decoder, void *value)
 341 {
 342         FLAC__ASSERT(decoder != 0);
 343         FLAC__ASSERT(decoder->private_ != 0);
 344         FLAC__ASSERT(decoder->protected_ != 0);
 345         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 346                 return false;
 347         decoder->private_->client_data = value;
 348         return true;
 349 }
 350
 351 FLAC__bool FLAC__stream_decoder_set_metadata_respond(const FLAC__StreamDecoder *decoder, FLAC__MetaDataType type)
 352 {
 353         FLAC__ASSERT(decoder != 0);
 354         FLAC__ASSERT(decoder->private_ != 0);
 355         FLAC__ASSERT(decoder->protected_ != 0);
 356         FLAC__ASSERT(type <= FLAC__METADATA_TYPE_VORBIS_COMMENT);
 357         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 358                 return false;
 359         decoder->private_->metadata_filter[type] = true;
 360         if(type == FLAC__METADATA_TYPE_APPLICATION)
 361                 decoder->private_->metadata_filter_ids_count = 0;
 362         return true;
 363 }
 364
 365 FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(const FLAC__StreamDecoder *decoder, FLAC__byte id[4])
 366 {
 367         FLAC__ASSERT(decoder != 0);
 368         FLAC__ASSERT(decoder->private_ != 0);
 369         FLAC__ASSERT(decoder->protected_ != 0);
 370         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 371                 return false;
 372
 373         if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
 374                 return true;
 375
 376         FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
 377
 378         if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
 379                 if(0 == (decoder->private_->metadata_filter_ids = realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2)))
 380                         return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 381                 decoder->private_->metadata_filter_ids_capacity *= 2;
 382         }
 383
 384         memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8));
 385         decoder->private_->metadata_filter_ids_count++;
 386
 387         return true;
 388 }
 389
 390 FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(const FLAC__StreamDecoder *decoder)
 391 {
 392         FLAC__ASSERT(decoder != 0);
 393         FLAC__ASSERT(decoder->private_ != 0);
 394         FLAC__ASSERT(decoder->protected_ != 0);
 395         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 396                 return false;
 397         /* OK, technically 0x01010101 != true, but it still means true */
 398         memset(decoder->private_->metadata_filter, 1, sizeof(decoder->private_->metadata_filter));
 399         decoder->private_->metadata_filter_ids_count = 0;
 400         return true;
 401 }
 402
 403 FLAC__bool FLAC__stream_decoder_set_metadata_ignore(const FLAC__StreamDecoder *decoder, FLAC__MetaDataType type)
 404 {
 405         FLAC__ASSERT(decoder != 0);
 406         FLAC__ASSERT(decoder->private_ != 0);
 407         FLAC__ASSERT(decoder->protected_ != 0);
 408         FLAC__ASSERT(type <= FLAC__METADATA_TYPE_VORBIS_COMMENT);
 409         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 410                 return false;
 411         decoder->private_->metadata_filter[type] = false;
 412         if(type == FLAC__METADATA_TYPE_APPLICATION)
 413                 decoder->private_->metadata_filter_ids_count = 0;
 414         return true;
 415 }
 416
 417 FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(const FLAC__StreamDecoder *decoder, FLAC__byte id[4])
 418 {
 419         FLAC__ASSERT(decoder != 0);
 420         FLAC__ASSERT(decoder->private_ != 0);
 421         FLAC__ASSERT(decoder->protected_ != 0);
 422         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 423                 return false;
 424
 425         if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
 426                 return true;
 427
 428         FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
 429
 430         if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
 431                 if(0 == (decoder->private_->metadata_filter_ids = realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2)))
 432                         return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 433                 decoder->private_->metadata_filter_ids_capacity *= 2;
 434         }
 435
 436         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));
 437         decoder->private_->metadata_filter_ids_count++;
 438
 439         return true;
 440 }
 441
 442 FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(const FLAC__StreamDecoder *decoder)
 443 {
 444         FLAC__ASSERT(decoder != 0);
 445         FLAC__ASSERT(decoder->private_ != 0);
 446         FLAC__ASSERT(decoder->protected_ != 0);
 447         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 448                 return false;
 449         memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
 450         decoder->private_->metadata_filter_ids_count = 0;
 451         return true;
 452 }
 453
 454 FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder)
 455 {
 456         FLAC__ASSERT(decoder != 0);
 457         FLAC__ASSERT(decoder->protected_ != 0);
 458         return decoder->protected_->state;
 459 }
 460
 461 unsigned FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder)
 462 {
 463         FLAC__ASSERT(decoder != 0);
 464         FLAC__ASSERT(decoder->protected_ != 0);
 465         return decoder->protected_->channels;
 466 }
 467
 468 FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder)
 469 {
 470         FLAC__ASSERT(decoder != 0);
 471         FLAC__ASSERT(decoder->protected_ != 0);
 472         return decoder->protected_->channel_assignment;
 473 }
 474
 475 unsigned FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder)
 476 {
 477         FLAC__ASSERT(decoder != 0);
 478         FLAC__ASSERT(decoder->protected_ != 0);
 479         return decoder->protected_->bits_per_sample;
 480 }
 481
 482 unsigned FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder)
 483 {
 484         FLAC__ASSERT(decoder != 0);
 485         FLAC__ASSERT(decoder->protected_ != 0);
 486         return decoder->protected_->sample_rate;
 487 }
 488
 489 unsigned FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder)
 490 {
 491         FLAC__ASSERT(decoder != 0);
 492         FLAC__ASSERT(decoder->protected_ != 0);
 493         return decoder->protected_->blocksize;
 494 }
 495
 496 FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder)
 497 {
 498         FLAC__ASSERT(decoder != 0);
 499         FLAC__ASSERT(decoder->private_ != 0);
 500         FLAC__ASSERT(decoder->protected_ != 0);
 501
 502         if(!FLAC__bitbuffer_clear(decoder->private_->input)) {
 503                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 504                 return false;
 505         }
 506         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 507
 508         return true;
 509 }
 510
 511 FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder)
 512 {
 513         FLAC__ASSERT(decoder != 0);
 514         FLAC__ASSERT(decoder->private_ != 0);
 515         FLAC__ASSERT(decoder->protected_ != 0);
 516
 517         if(!FLAC__stream_decoder_flush(decoder)) {
 518                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 519                 return false;
 520         }
 521         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
 522
 523         decoder->private_->samples_decoded = 0;
 524
 525         return true;
 526 }
 527
 528 FLAC__bool FLAC__stream_decoder_process_whole_stream(FLAC__StreamDecoder *decoder)
 529 {
 530         FLAC__bool dummy;
 531         FLAC__ASSERT(decoder != 0);
 532
 533         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 534                 return true;
 535
 536         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA);
 537
 538         if(!FLAC__stream_decoder_reset(decoder)) {
 539                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 540                 return false;
 541         }
 542
 543         while(1) {
 544                 switch(decoder->protected_->state) {
 545                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
 546                                 if(!stream_decoder_find_metadata_(decoder))
 547                                         return false; /* above function sets the status for us */
 548                                 break;
 549                         case FLAC__STREAM_DECODER_READ_METADATA:
 550                                 if(!stream_decoder_read_metadata_(decoder))
 551                                         return false; /* above function sets the status for us */
 552                                 break;
 553                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 554                                 if(!stream_decoder_frame_sync_(decoder))
 555                                         return true; /* above function sets the status for us */
 556                                 break;
 557                         case FLAC__STREAM_DECODER_READ_FRAME:
 558                                 if(!stream_decoder_read_frame_(decoder, &dummy))
 559                                         return false; /* above function sets the status for us */
 560                                 break;
 561                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 562                                 return true;
 563                         default:
 564                                 FLAC__ASSERT(0);
 565                 }
 566         }
 567 }
 568
 569 FLAC__bool FLAC__stream_decoder_process_metadata(FLAC__StreamDecoder *decoder)
 570 {
 571         FLAC__ASSERT(decoder != 0);
 572
 573         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 574                 return true;
 575
 576         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA);
 577
 578         if(!FLAC__stream_decoder_reset(decoder)) {
 579                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 580                 return false;
 581         }
 582
 583         while(1) {
 584                 switch(decoder->protected_->state) {
 585                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
 586                                 if(!stream_decoder_find_metadata_(decoder))
 587                                         return false; /* above function sets the status for us */
 588                                 break;
 589                         case FLAC__STREAM_DECODER_READ_METADATA:
 590                                 if(!stream_decoder_read_metadata_(decoder))
 591                                         return false; /* above function sets the status for us */
 592                                 break;
 593                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 594                                 return true;
 595                         case FLAC__STREAM_DECODER_READ_FRAME:
 596                                 return true;
 597                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 598                                 return true;
 599                         default:
 600                                 FLAC__ASSERT(0);
 601                 }
 602         }
 603 }
 604
 605 FLAC__bool FLAC__stream_decoder_process_one_frame(FLAC__StreamDecoder *decoder)
 606 {
 607         FLAC__bool got_a_frame;
 608         FLAC__ASSERT(decoder != 0);
 609
 610         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 611                 return true;
 612
 613         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC);
 614
 615         while(1) {
 616                 switch(decoder->protected_->state) {
 617                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 618                                 if(!stream_decoder_frame_sync_(decoder))
 619                                         return true; /* above function sets the status for us */
 620                                 break;
 621                         case FLAC__STREAM_DECODER_READ_FRAME:
 622                                 if(!stream_decoder_read_frame_(decoder, &got_a_frame))
 623                                         return false; /* above function sets the status for us */
 624                                 if(got_a_frame)
 625                                         return true; /* above function sets the status for us */
 626                                 break;
 627                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 628                                 return true;
 629                         default:
 630                                 FLAC__ASSERT(0);
 631                 }
 632         }
 633 }
 634
 635 FLAC__bool FLAC__stream_decoder_process_remaining_frames(FLAC__StreamDecoder *decoder)
 636 {
 637         FLAC__bool dummy;
 638         FLAC__ASSERT(decoder != 0);
 639
 640         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 641                 return true;
 642
 643         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC);
 644
 645         while(1) {
 646                 switch(decoder->protected_->state) {
 647                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 648                                 if(!stream_decoder_frame_sync_(decoder))
 649                                         return true; /* above function sets the status for us */
 650                                 break;
 651                         case FLAC__STREAM_DECODER_READ_FRAME:
 652                                 if(!stream_decoder_read_frame_(decoder, &dummy))
 653                                         return false; /* above function sets the status for us */
 654                                 break;
 655                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 656                                 return true;
 657                         default:
 658                                 FLAC__ASSERT(0);
 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(decoder != 0);
 672         return FLAC__bitbuffer_get_input_bytes_unconsumed(decoder->private_->input);
 673 }
 674
 675 /***********************************************************************
 676  *
 677  * Private class methods
 678  *
 679  ***********************************************************************/
 680
 681 FLAC__bool stream_decoder_allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels)
 682 {
 683         unsigned i;
 684         FLAC__int32 *tmp;
 685
 686         if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels)
 687                 return true;
 688
 689         /* @@@ should change to use realloc() */
 690
 691         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 692                 if(decoder->private_->output[i] != 0) {
 693                         free(decoder->private_->output[i]);
 694                         decoder->private_->output[i] = 0;
 695                 }
 696                 if(decoder->private_->residual[i] != 0) {
 697                         free(decoder->private_->residual[i]);
 698                         decoder->private_->residual[i] = 0;
 699                 }
 700         }
 701
 702         for(i = 0; i < channels; i++) {
 703                 /* WATCHOUT: FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the output arrays have a buffer of up to 3 zeroes in front (at negative indices) for alignment purposes; we use 4 to keep the data well-aligned. */
 704                 tmp = (FLAC__int32*)malloc(sizeof(FLAC__int32)*(size+4));
 705                 if(tmp == 0) {
 706                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 707                         return false;
 708                 }
 709                 memset(tmp, 0, sizeof(FLAC__int32)*4);
 710                 decoder->private_->output[i] = tmp + 4;
 711
 712                 tmp = (FLAC__int32*)malloc(sizeof(FLAC__int32)*size);
 713                 if(tmp == 0) {
 714                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 715                         return false;
 716                 }
 717                 decoder->private_->residual[i] = tmp;
 718         }
 719
 720         decoder->private_->output_capacity = size;
 721         decoder->private_->output_channels = channels;
 722
 723         return true;
 724 }
 725
 726 FLAC__bool stream_decoder_has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id)
 727 {
 728         unsigned i;
 729
 730         FLAC__ASSERT(0 != decoder);
 731         FLAC__ASSERT(0 != decoder->private_);
 732
 733         for(i = 0; i < decoder->private_->metadata_filter_ids_count; i++)
 734                 if(0 == memcmp(decoder->private_->metadata_filter_ids + i * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)))
 735                         return true;
 736
 737         return false;
 738 }
 739
 740 FLAC__bool stream_decoder_find_metadata_(FLAC__StreamDecoder *decoder)
 741 {
 742         FLAC__uint32 x;
 743         unsigned i, id;
 744         FLAC__bool first = true;
 745
 746         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
 747
 748         for(i = id = 0; i < 4; ) {
 749                 if(decoder->private_->cached) {
 750                         x = (FLAC__uint32)decoder->private_->lookahead;
 751                         decoder->private_->cached = false;
 752                 }
 753                 else {
 754                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
 755                                 return false; /* the read_callback_ sets the state for us */
 756                 }
 757                 if(x == FLAC__STREAM_SYNC_STRING[i]) {
 758                         first = true;
 759                         i++;
 760                         id = 0;
 761                         continue;
 762                 }
 763                 if(x == ID3V2_TAG_[id]) {
 764                         id++;
 765                         i = 0;
 766                         if(id == 3) {
 767                                 if(!stream_decoder_skip_id3v2_tag_(decoder))
 768                                         return false; /* the read_callback_ sets the state for us */
 769                         }
 770                         continue;
 771                 }
 772                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 773                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
 774                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
 775                                 return false; /* the read_callback_ sets the state for us */
 776
 777                         /* 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 */
 778                         /* else we have to check if the second byte is the end of a sync code */
 779                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 780                                 decoder->private_->lookahead = (FLAC__byte)x;
 781                                 decoder->private_->cached = true;
 782                         }
 783                         else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
 784                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
 785                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
 786                                 return true;
 787                         }
 788                 }
 789                 i = 0;
 790                 if(first) {
 791                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_LOST_SYNC, decoder->private_->client_data);
 792                         first = false;
 793                 }
 794         }
 795
 796         decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA;
 797         return true;
 798 }
 799
 800 FLAC__bool stream_decoder_read_metadata_(FLAC__StreamDecoder *decoder)
 801 {
 802         FLAC__uint32 i, x, last_block, type, length;
 803         FLAC__uint64 xx;
 804
 805         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
 806
 807         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &last_block, FLAC__STREAM_METADATA_IS_LAST_LEN, read_callback_, decoder))
 808                 return false; /* the read_callback_ sets the state for us */
 809         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN, read_callback_, decoder))
 810                 return false; /* the read_callback_ sets the state for us */
 811         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN, read_callback_, decoder))
 812                 return false; /* the read_callback_ sets the state for us */
 813         if(type == FLAC__METADATA_TYPE_STREAMINFO) {
 814                 unsigned used_bits = 0;
 815                 decoder->private_->stream_info.type = type;
 816                 decoder->private_->stream_info.is_last = last_block;
 817                 decoder->private_->stream_info.length = length;
 818
 819                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN, read_callback_, decoder))
 820                         return false; /* the read_callback_ sets the state for us */
 821                 decoder->private_->stream_info.data.stream_info.min_blocksize = x;
 822                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN;
 823
 824                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN, read_callback_, decoder))
 825                         return false; /* the read_callback_ sets the state for us */
 826                 decoder->private_->stream_info.data.stream_info.max_blocksize = x;
 827                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN;
 828
 829                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN, read_callback_, decoder))
 830                         return false; /* the read_callback_ sets the state for us */
 831                 decoder->private_->stream_info.data.stream_info.min_framesize = x;
 832                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN;
 833
 834                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN, read_callback_, decoder))
 835                         return false; /* the read_callback_ sets the state for us */
 836                 decoder->private_->stream_info.data.stream_info.max_framesize = x;
 837                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN;
 838
 839                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN, read_callback_, decoder))
 840                         return false; /* the read_callback_ sets the state for us */
 841                 decoder->private_->stream_info.data.stream_info.sample_rate = x;
 842                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN;
 843
 844                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN, read_callback_, decoder))
 845                         return false; /* the read_callback_ sets the state for us */
 846                 decoder->private_->stream_info.data.stream_info.channels = x+1;
 847                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN;
 848
 849                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN, read_callback_, decoder))
 850                         return false; /* the read_callback_ sets the state for us */
 851                 decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1;
 852                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN;
 853
 854                 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))
 855                         return false; /* the read_callback_ sets the state for us */
 856                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN;
 857
 858                 if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, decoder->private_->stream_info.data.stream_info.md5sum, 16, read_callback_, decoder))
 859                         return false; /* the read_callback_ sets the state for us */
 860                 used_bits += 16*8;
 861
 862                 /* skip the rest of the block */
 863                 FLAC__ASSERT(used_bits % 8 == 0);
 864                 length -= (used_bits / 8);
 865                 if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, length, read_callback_, decoder))
 866                         return false; /* the read_callback_ sets the state for us */
 867
 868                 decoder->private_->has_stream_info = true;
 869                 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO])
 870                         decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data);
 871         }
 872         else if(type == FLAC__METADATA_TYPE_SEEKTABLE) {
 873                 unsigned real_points;
 874
 875                 decoder->private_->seek_table.type = type;
 876                 decoder->private_->seek_table.is_last = last_block;
 877                 decoder->private_->seek_table.length = length;
 878
 879                 decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
 880
 881                 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)))) {
 882                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 883                         return false;
 884                 }
 885                 for(i = real_points = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) {
 886                         if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN, read_callback_, decoder))
 887                                 return false; /* the read_callback_ sets the state for us */
 888                         decoder->private_->seek_table.data.seek_table.points[real_points].sample_number = xx;
 889
 890                         if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN, read_callback_, decoder))
 891                                 return false; /* the read_callback_ sets the state for us */
 892                         decoder->private_->seek_table.data.seek_table.points[real_points].stream_offset = xx;
 893
 894                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN, read_callback_, decoder))
 895                                 return false; /* the read_callback_ sets the state for us */
 896                         decoder->private_->seek_table.data.seek_table.points[real_points].frame_samples = x;
 897
 898                         if(decoder->private_->seek_table.data.seek_table.points[real_points].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER)
 899                                 real_points++;
 900                 }
 901                 length -= (decoder->private_->seek_table.data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH);
 902                 decoder->private_->seek_table.data.seek_table.num_points = real_points;
 903
 904                 /* if there is a partial point left, skip over it */
 905                 if(length > 0) {
 906                         /*@@@ do an error_callback() here?  there's an argument for either way */
 907                         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, length, read_callback_, decoder))
 908                                 return false; /* the read_callback_ sets the state for us */
 909                 }
 910
 911                 decoder->private_->has_seek_table = true;
 912                 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_SEEKTABLE])
 913                         decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data);
 914         }
 915         else {
 916                 FLAC__bool skip_it = !decoder->private_->metadata_filter[type];
 917                 unsigned real_length = length;
 918                 FLAC__StreamMetaData block;
 919
 920                 block.is_last = last_block;
 921                 block.type = type;
 922                 block.length = length;
 923
 924                 if(type == FLAC__METADATA_TYPE_APPLICATION && decoder->private_->metadata_filter_ids_count > 0) {
 925                         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, block.data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8, read_callback_, decoder))
 926                                 return false; /* the read_callback_ sets the state for us */
 927
 928                         real_length -= FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8;
 929
 930                         if(stream_decoder_has_id_filtered_(decoder, block.data.application.id))
 931                                 skip_it = !skip_it;
 932                 }
 933
 934                 if(skip_it) {
 935                         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, real_length, read_callback_, decoder))
 936                                 return false; /* the read_callback_ sets the state for us */
 937                 }
 938                 else {
 939                         switch(type) {
 940                                 case FLAC__METADATA_TYPE_PADDING:
 941                                         /* skip the padding bytes */
 942                                         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, real_length, read_callback_, decoder))
 943                                                 return false; /* the read_callback_ sets the state for us */
 944                                         break;
 945                                 case FLAC__METADATA_TYPE_APPLICATION:
 946                                         /* remember, we read the ID already */
 947                                         if(0 == (block.data.application.data = malloc(real_length))) {
 948                                                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 949                                                 return false;
 950                                         }
 951                                         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, block.data.application.data, real_length, read_callback_, decoder))
 952                                                 return false; /* the read_callback_ sets the state for us */
 953                                         break;
 954                                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 955                                         /* read vendor string */
 956                                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &block.data.vorbis_comment.vendor_string.length, FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN, read_callback_, decoder))
 957                                                 return false; /* the read_callback_ sets the state for us */
 958                                         if(block.data.vorbis_comment.vendor_string.length > 0) {
 959                                                 if(0 == (block.data.vorbis_comment.vendor_string.entry = malloc(block.data.vorbis_comment.vendor_string.length))) {
 960                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 961                                                         return false;
 962                                                 }
 963                                                 if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, block.data.vorbis_comment.vendor_string.entry, block.data.vorbis_comment.vendor_string.length, read_callback_, decoder))
 964                                                         return false; /* the read_callback_ sets the state for us */
 965                                         }
 966                                         else
 967                                                 block.data.vorbis_comment.vendor_string.entry = 0;
 968
 969                                         /* read num comments */
 970                                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &block.data.vorbis_comment.num_comments, FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN, read_callback_, decoder))
 971                                                 return false; /* the read_callback_ sets the state for us */
 972
 973                                         /* read comments */
 974                                         if(block.data.vorbis_comment.num_comments > 0) {
 975                                                 if(0 == (block.data.vorbis_comment.comments = malloc(block.data.vorbis_comment.num_comments * sizeof(FLAC__StreamMetaData_VorbisComment_Entry)))) {
 976                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 977                                                         return false;
 978                                                 }
 979                                                 for(i = 0; i < block.data.vorbis_comment.num_comments; i++) {
 980                                                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &block.data.vorbis_comment.comments[i].length, FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN, read_callback_, decoder))
 981                                                                 return false; /* the read_callback_ sets the state for us */
 982                                                         if(block.data.vorbis_comment.comments[i].length > 0) {
 983                                                                 if(0 == (block.data.vorbis_comment.comments[i].entry = malloc(block.data.vorbis_comment.comments[i].length))) {
 984                                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 985                                                                         return false;
 986                                                                 }
 987                                                                 if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, block.data.vorbis_comment.comments[i].entry, block.data.vorbis_comment.comments[i].length, read_callback_, decoder))
 988                                                                         return false; /* the read_callback_ sets the state for us */
 989                                                         }
 990                                                         else
 991                                                                 block.data.vorbis_comment.comments[i].entry = 0;
 992                                                 }
 993                                         }
 994                                         else {
 995                                                 block.data.vorbis_comment.comments = 0;
 996                                         }
 997                                         break;
 998                                 case FLAC__METADATA_TYPE_STREAMINFO:
 999                                 case FLAC__METADATA_TYPE_SEEKTABLE:
1000                                 default:
1001                                         FLAC__ASSERT(0);
1002                         }
1003                         decoder->private_->metadata_callback(decoder, &block, decoder->private_->client_data);
1004
1005                         /* now we have to free any malloc'ed data in the block */
1006                         switch(type) {
1007                                 case FLAC__METADATA_TYPE_PADDING:
1008                                         break;
1009                                 case FLAC__METADATA_TYPE_APPLICATION:
1010                                         if(0 != block.data.application.data)
1011                                                 free(block.data.application.data);
1012                                         break;
1013                                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1014                                         if(0 != block.data.vorbis_comment.vendor_string.entry)
1015                                                 free(block.data.vorbis_comment.vendor_string.entry);
1016                                         if(block.data.vorbis_comment.num_comments > 0)
1017                                                 for(i = 0; i < block.data.vorbis_comment.num_comments; i++)
1018                                                         if(0 != block.data.vorbis_comment.comments[i].entry)
1019                                                                 free(block.data.vorbis_comment.comments[i].entry);
1020                                         if(0 != block.data.vorbis_comment.comments)
1021                                                 free(block.data.vorbis_comment.comments);
1022                                         break;
1023                                 case FLAC__METADATA_TYPE_STREAMINFO:
1024                                 case FLAC__METADATA_TYPE_SEEKTABLE:
1025                                 default:
1026                                         FLAC__ASSERT(0);
1027                         }
1028                 }
1029         }
1030
1031         if(last_block)
1032                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1033
1034         return true;
1035 }
1036
1037 FLAC__bool stream_decoder_skip_id3v2_tag_(FLAC__StreamDecoder *decoder)
1038 {
1039         FLAC__uint32 x;
1040         unsigned i, skip;
1041
1042         /* skip the version and flags bytes */
1043         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 24, read_callback_, decoder))
1044                 return false; /* the read_callback_ sets the state for us */
1045         /* get the size (in bytes) to skip */
1046         skip = 0;
1047         for(i = 0; i < 4; i++) {
1048                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1049                         return false; /* the read_callback_ sets the state for us */
1050                 skip <<= 7;
1051                 skip |= (x & 0x7f);
1052         }
1053         /* skip the rest of the tag */
1054         if(!FLAC__bitbuffer_read_byte_block_aligned(decoder->private_->input, 0, skip, read_callback_, decoder))
1055                 return false; /* the read_callback_ sets the state for us */
1056         return true;
1057 }
1058
1059 FLAC__bool stream_decoder_frame_sync_(FLAC__StreamDecoder *decoder)
1060 {
1061         FLAC__uint32 x;
1062         FLAC__bool first = true;
1063
1064         /* If we know the total number of samples in the stream, stop if we've read that many. */
1065         /* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */
1066         if(decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.total_samples) {
1067                 if(decoder->private_->samples_decoded >= decoder->private_->stream_info.data.stream_info.total_samples) {
1068                         decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1069                         return true;
1070                 }
1071         }
1072
1073         /* make sure we're byte aligned */
1074         if(!FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input)) {
1075                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__bitbuffer_bits_left_for_byte_alignment(decoder->private_->input), read_callback_, decoder))
1076                         return false; /* the read_callback_ sets the state for us */
1077         }
1078
1079         while(1) {
1080                 if(decoder->private_->cached) {
1081                         x = (FLAC__uint32)decoder->private_->lookahead;
1082                         decoder->private_->cached = false;
1083                 }
1084                 else {
1085                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1086                                 return false; /* the read_callback_ sets the state for us */
1087                 }
1088                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1089                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
1090                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1091                                 return false; /* the read_callback_ sets the state for us */
1092
1093                         /* 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 */
1094                         /* else we have to check if the second byte is the end of a sync code */
1095                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1096                                 decoder->private_->lookahead = (FLAC__byte)x;
1097                                 decoder->private_->cached = true;
1098                         }
1099                         else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
1100                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
1101                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
1102                                 return true;
1103                         }
1104                 }
1105                 if(first) {
1106                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_LOST_SYNC, decoder->private_->client_data);
1107                         first = false;
1108                 }
1109         }
1110
1111         return true;
1112 }
1113
1114 FLAC__bool stream_decoder_read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame)
1115 {
1116         unsigned channel;
1117         unsigned i;
1118         FLAC__int32 mid, side, left, right;
1119         FLAC__uint16 frame_crc; /* the one we calculate from the input stream */
1120         FLAC__uint32 x;
1121
1122         *got_a_frame = false;
1123
1124         /* init the CRC */
1125         frame_crc = 0;
1126         FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc);
1127         FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc);
1128         FLAC__bitbuffer_reset_read_crc16(decoder->private_->input, frame_crc);
1129
1130         if(!stream_decoder_read_frame_header_(decoder))
1131                 return false;
1132         if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC)
1133                 return true;
1134         if(!stream_decoder_allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels))
1135                 return false;
1136         for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
1137                 /*
1138                  * first figure the correct bits-per-sample of the subframe
1139                  */
1140                 unsigned bps = decoder->private_->frame.header.bits_per_sample;
1141                 switch(decoder->private_->frame.header.channel_assignment) {
1142                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1143                                 /* no adjustment needed */
1144                                 break;
1145                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1146                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1147                                 if(channel == 1)
1148                                         bps++;
1149                                 break;
1150                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1151                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1152                                 if(channel == 0)
1153                                         bps++;
1154                                 break;
1155                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1156                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1157                                 if(channel == 1)
1158                                         bps++;
1159                                 break;
1160                         default:
1161                                 FLAC__ASSERT(0);
1162                 }
1163                 /*
1164                  * now read it
1165                  */
1166                 if(!stream_decoder_read_subframe_(decoder, channel, bps))
1167                         return false;
1168                 if(decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME) {
1169                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1170                         return true;
1171                 }
1172         }
1173         if(!stream_decoder_read_zero_padding_(decoder))
1174                 return false;
1175
1176         /*
1177          * Read the frame CRC-16 from the footer and check
1178          */
1179         frame_crc = FLAC__bitbuffer_get_read_crc16(decoder->private_->input);
1180         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN, read_callback_, decoder))
1181                 return false; /* the read_callback_ sets the state for us */
1182         if(frame_crc == (FLAC__uint16)x) {
1183                 /* Undo any special channel coding */
1184                 switch(decoder->private_->frame.header.channel_assignment) {
1185                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1186                                 /* do nothing */
1187                                 break;
1188                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1189                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1190                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1191                                         decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i];
1192                                 break;
1193                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1194                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1195                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1196                                         decoder->private_->output[0][i] += decoder->private_->output[1][i];
1197                                 break;
1198                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1199                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1200                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
1201                                         mid = decoder->private_->output[0][i];
1202                                         side = decoder->private_->output[1][i];
1203                                         mid <<= 1;
1204                                         if(side & 1) /* i.e. if 'side' is odd... */
1205                                                 mid++;
1206                                         left = mid + side;
1207                                         right = mid - side;
1208                                         decoder->private_->output[0][i] = left >> 1;
1209                                         decoder->private_->output[1][i] = right >> 1;
1210                                 }
1211                                 break;
1212                         default:
1213                                 FLAC__ASSERT(0);
1214                                 break;
1215                 }
1216         }
1217         else {
1218                 /* Bad frame, emit error and zero the output signal */
1219                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_FRAME_CRC_MISMATCH, decoder->private_->client_data);
1220                 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
1221                         memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
1222                 }
1223         }
1224
1225         *got_a_frame = true;
1226
1227         /* put the latest values into the public section of the decoder instance */
1228         decoder->protected_->channels = decoder->private_->frame.header.channels;
1229         decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment;
1230         decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample;
1231         decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate;
1232         decoder->protected_->blocksize = decoder->private_->frame.header.blocksize;
1233
1234         FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
1235         decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize;
1236
1237         /* write it */
1238         /* NOTE: some versions of GCC can't figure out const-ness right and will give you an 'incompatible pointer type' warning on arg 3 here: */
1239         if(decoder->private_->write_callback(decoder, &decoder->private_->frame, decoder->private_->output, decoder->private_->client_data) != FLAC__STREAM_DECODER_WRITE_CONTINUE)
1240                 return false;
1241
1242         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1243         return true;
1244 }
1245
1246 FLAC__bool stream_decoder_read_frame_header_(FLAC__StreamDecoder *decoder)
1247 {
1248         FLAC__uint32 x;
1249         FLAC__uint64 xx;
1250         unsigned i, blocksize_hint = 0, sample_rate_hint = 0;
1251         FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */
1252         unsigned raw_header_len;
1253         FLAC__bool is_unparseable = false;
1254         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);
1255         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);
1256
1257         FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
1258
1259         /* init the raw header with the saved bits from synchronization */
1260         raw_header[0] = decoder->private_->header_warmup[0];
1261         raw_header[1] = decoder->private_->header_warmup[1];
1262         raw_header_len = 2;
1263
1264         /*
1265          * check to make sure that the reserved bits are 0
1266          */
1267         if(raw_header[1] & 0x03) { /* MAGIC NUMBER */
1268                 is_unparseable = true;
1269         }
1270
1271         /*
1272          * Note that along the way as we read the header, we look for a sync
1273          * code inside.  If we find one it would indicate that our original
1274          * sync was bad since there cannot be a sync code in a valid header.
1275          */
1276
1277         /*
1278          * read in the raw header as bytes so we can CRC it, and parse it on the way
1279          */
1280         for(i = 0; i < 2; i++) {
1281                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1282                         return false; /* the read_callback_ sets the state for us */
1283                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1284                         /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */
1285                         decoder->private_->lookahead = (FLAC__byte)x;
1286                         decoder->private_->cached = true;
1287                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private_->client_data);
1288                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1289                         return true;
1290                 }
1291                 raw_header[raw_header_len++] = (FLAC__byte)x;
1292         }
1293
1294         switch(x = raw_header[2] >> 4) {
1295                 case 0:
1296                         if(is_known_fixed_blocksize_stream)
1297                                 decoder->private_->frame.header.blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize;
1298                         else
1299                                 is_unparseable = true;
1300                         break;
1301                 case 1:
1302                         decoder->private_->frame.header.blocksize = 192;
1303                         break;
1304                 case 2:
1305                 case 3:
1306                 case 4:
1307                 case 5:
1308                         decoder->private_->frame.header.blocksize = 576 << (x-2);
1309                         break;
1310                 case 6:
1311                 case 7:
1312                         blocksize_hint = x;
1313                         break;
1314                 case 8:
1315                 case 9:
1316                 case 10:
1317                 case 11:
1318                 case 12:
1319                 case 13:
1320                 case 14:
1321                 case 15:
1322                         decoder->private_->frame.header.blocksize = 256 << (x-8);
1323                         break;
1324                 default:
1325                         FLAC__ASSERT(0);
1326                         break;
1327         }
1328
1329         switch(x = raw_header[2] & 0x0f) {
1330                 case 0:
1331                         if(decoder->private_->has_stream_info)
1332                                 decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate;
1333                         else
1334                                 is_unparseable = true;
1335                         break;
1336                 case 1:
1337                 case 2:
1338                 case 3:
1339                         is_unparseable = true;
1340                         break;
1341                 case 4:
1342                         decoder->private_->frame.header.sample_rate = 8000;
1343                         break;
1344                 case 5:
1345                         decoder->private_->frame.header.sample_rate = 16000;
1346                         break;
1347                 case 6:
1348                         decoder->private_->frame.header.sample_rate = 22050;
1349                         break;
1350                 case 7:
1351                         decoder->private_->frame.header.sample_rate = 24000;
1352                         break;
1353                 case 8:
1354                         decoder->private_->frame.header.sample_rate = 32000;
1355                         break;
1356                 case 9:
1357                         decoder->private_->frame.header.sample_rate = 44100;
1358                         break;
1359                 case 10:
1360                         decoder->private_->frame.header.sample_rate = 48000;
1361                         break;
1362                 case 11:
1363                         decoder->private_->frame.header.sample_rate = 96000;
1364                         break;
1365                 case 12:
1366                 case 13:
1367                 case 14:
1368                         sample_rate_hint = x;
1369                         break;
1370                 case 15:
1371                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private_->client_data);
1372                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1373                         return true;
1374                 default:
1375                         FLAC__ASSERT(0);
1376         }
1377
1378         x = (unsigned)(raw_header[3] >> 4);
1379         if(x & 8) {
1380                 decoder->private_->frame.header.channels = 2;
1381                 switch(x & 7) {
1382                         case 0:
1383                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE;
1384                                 break;
1385                         case 1:
1386                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE;
1387                                 break;
1388                         case 2:
1389                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE;
1390                                 break;
1391                         default:
1392                                 is_unparseable = true;
1393                                 break;
1394                 }
1395         }
1396         else {
1397                 decoder->private_->frame.header.channels = (unsigned)x + 1;
1398                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT;
1399         }
1400
1401         switch(x = (unsigned)(raw_header[3] & 0x0e) >> 1) {
1402                 case 0:
1403                         if(decoder->private_->has_stream_info)
1404                                 decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample;
1405                         else
1406                                 is_unparseable = true;
1407                         break;
1408                 case 1:
1409                         decoder->private_->frame.header.bits_per_sample = 8;
1410                         break;
1411                 case 2:
1412                         decoder->private_->frame.header.bits_per_sample = 12;
1413                         break;
1414                 case 4:
1415                         decoder->private_->frame.header.bits_per_sample = 16;
1416                         break;
1417                 case 5:
1418                         decoder->private_->frame.header.bits_per_sample = 20;
1419                         break;
1420                 case 6:
1421                         decoder->private_->frame.header.bits_per_sample = 24;
1422                         break;
1423                 case 3:
1424                 case 7:
1425                         is_unparseable = true;
1426                         break;
1427                 default:
1428                         FLAC__ASSERT(0);
1429                         break;
1430         }
1431
1432         if(raw_header[3] & 0x01) { /* this should be a zero padding bit */
1433                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private_->client_data);
1434                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1435                 return true;
1436         }
1437
1438         if(blocksize_hint && is_known_variable_blocksize_stream) {
1439                 if(!FLAC__bitbuffer_read_utf8_uint64(decoder->private_->input, &xx, read_callback_, decoder, raw_header, &raw_header_len))
1440                         return false; /* the read_callback_ sets the state for us */
1441                 if(xx == 0xffffffffffffffff) { /* i.e. non-UTF8 code... */
1442                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
1443                         decoder->private_->cached = true;
1444                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private_->client_data);
1445                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1446                         return true;
1447                 }
1448                 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
1449                 decoder->private_->frame.header.number.sample_number = xx;
1450         }
1451         else {
1452                 if(!FLAC__bitbuffer_read_utf8_uint32(decoder->private_->input, &x, read_callback_, decoder, raw_header, &raw_header_len))
1453                         return false; /* the read_callback_ sets the state for us */
1454                 if(x == 0xffffffff) { /* i.e. non-UTF8 code... */
1455                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
1456                         decoder->private_->cached = true;
1457                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private_->client_data);
1458                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1459                         return true;
1460                 }
1461                 decoder->private_->last_frame_number = x;
1462                 if(decoder->private_->has_stream_info) {
1463                         decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
1464                         decoder->private_->frame.header.number.sample_number = (FLAC__int64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__int64)x;
1465                 }
1466                 else {
1467                         is_unparseable = true;
1468                 }
1469         }
1470
1471         if(blocksize_hint) {
1472                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1473                         return false; /* the read_callback_ sets the state for us */
1474                 raw_header[raw_header_len++] = (FLAC__byte)x;
1475                 if(blocksize_hint == 7) {
1476                         FLAC__uint32 _x;
1477                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &_x, 8, read_callback_, decoder))
1478                                 return false; /* the read_callback_ sets the state for us */
1479                         raw_header[raw_header_len++] = (FLAC__byte)_x;
1480                         x = (x << 8) | _x;
1481                 }
1482                 decoder->private_->frame.header.blocksize = x+1;
1483         }
1484
1485         if(sample_rate_hint) {
1486                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1487                         return false; /* the read_callback_ sets the state for us */
1488                 raw_header[raw_header_len++] = (FLAC__byte)x;
1489                 if(sample_rate_hint != 12) {
1490                         FLAC__uint32 _x;
1491                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &_x, 8, read_callback_, decoder))
1492                                 return false; /* the read_callback_ sets the state for us */
1493                         raw_header[raw_header_len++] = (FLAC__byte)_x;
1494                         x = (x << 8) | _x;
1495                 }
1496                 if(sample_rate_hint == 12)
1497                         decoder->private_->frame.header.sample_rate = x*1000;
1498                 else if(sample_rate_hint == 13)
1499                         decoder->private_->frame.header.sample_rate = x;
1500                 else
1501                         decoder->private_->frame.header.sample_rate = x*10;
1502         }
1503
1504         /* read the CRC-8 byte */
1505         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1506                 return false; /* the read_callback_ sets the state for us */
1507         crc8 = (FLAC__byte)x;
1508
1509         if(FLAC__crc8(raw_header, raw_header_len) != crc8) {
1510                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private_->client_data);
1511                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1512                 return true;
1513         }
1514
1515         if(is_unparseable) {
1516                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1517                 return false;
1518         }
1519
1520         return true;
1521 }
1522
1523 FLAC__bool stream_decoder_read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1524 {
1525         FLAC__uint32 x;
1526         FLAC__bool wasted_bits;
1527
1528         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder)) /* MAGIC NUMBER */
1529                 return false; /* the read_callback_ sets the state for us */
1530
1531         wasted_bits = (x & 1);
1532         x &= 0xfe;
1533
1534         if(wasted_bits) {
1535                 unsigned u;
1536                 if(!FLAC__bitbuffer_read_unary_unsigned(decoder->private_->input, &u, read_callback_, decoder))
1537                         return false; /* the read_callback_ sets the state for us */
1538                 decoder->private_->frame.subframes[channel].wasted_bits = u+1;
1539                 bps -= decoder->private_->frame.subframes[channel].wasted_bits;
1540         }
1541         else
1542                 decoder->private_->frame.subframes[channel].wasted_bits = 0;
1543
1544         /*
1545          * Lots of magic numbers here
1546          */
1547         if(x & 0x80) {
1548                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_LOST_SYNC, decoder->private_->client_data);
1549                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1550                 return true;
1551         }
1552         else if(x == 0) {
1553                 if(!stream_decoder_read_subframe_constant_(decoder, channel, bps))
1554                         return false;
1555         }
1556         else if(x == 2) {
1557                 if(!stream_decoder_read_subframe_verbatim_(decoder, channel, bps))
1558                         return false;
1559         }
1560         else if(x < 16) {
1561                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1562                 return false;
1563         }
1564         else if(x <= 24) {
1565                 if(!stream_decoder_read_subframe_fixed_(decoder, channel, bps, (x>>1)&7))
1566                         return false;
1567         }
1568         else if(x < 64) {
1569                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1570                 return false;
1571         }
1572         else {
1573                 if(!stream_decoder_read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1))
1574                         return false;
1575         }
1576
1577         if(wasted_bits) {
1578                 unsigned i;
1579                 x = decoder->private_->frame.subframes[channel].wasted_bits;
1580                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1581                         decoder->private_->output[channel][i] <<= x;
1582         }
1583
1584         return true;
1585 }
1586
1587 FLAC__bool stream_decoder_read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1588 {
1589         FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant;
1590         FLAC__int32 x;
1591         unsigned i;
1592         FLAC__int32 *output = decoder->private_->output[channel];
1593
1594         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT;
1595
1596         if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &x, bps, read_callback_, decoder))
1597                 return false; /* the read_callback_ sets the state for us */
1598
1599         subframe->value = x;
1600
1601         /* decode the subframe */
1602         for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1603                 output[i] = x;
1604
1605         return true;
1606 }
1607
1608 FLAC__bool stream_decoder_read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order)
1609 {
1610         FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed;
1611         FLAC__int32 i32;
1612         FLAC__uint32 u32;
1613         unsigned u;
1614
1615         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED;
1616
1617         subframe->residual = decoder->private_->residual[channel];
1618         subframe->order = order;
1619
1620         /* read warm-up samples */
1621         for(u = 0; u < order; u++) {
1622                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, bps, read_callback_, decoder))
1623                         return false; /* the read_callback_ sets the state for us */
1624                 subframe->warmup[u] = i32;
1625         }
1626
1627         /* read entropy coding method info */
1628         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder))
1629                 return false; /* the read_callback_ sets the state for us */
1630         subframe->entropy_coding_method.type = u32;
1631         switch(subframe->entropy_coding_method.type) {
1632                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1633                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder))
1634                                 return false; /* the read_callback_ sets the state for us */
1635                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
1636                         break;
1637                 default:
1638                         decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1639                         return false;
1640         }
1641
1642         /* read residual */
1643         switch(subframe->entropy_coding_method.type) {
1644                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1645                         if(!stream_decoder_read_residual_partitioned_rice_(decoder, order, &subframe->entropy_coding_method.data.partitioned_rice, decoder->private_->residual[channel]))
1646                                 return false;
1647                         break;
1648                 default:
1649                         FLAC__ASSERT(0);
1650         }
1651
1652         /* decode the subframe */
1653         memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
1654         FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order);
1655
1656         return true;
1657 }
1658
1659 FLAC__bool stream_decoder_read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order)
1660 {
1661         FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc;
1662         FLAC__int32 i32;
1663         FLAC__uint32 u32;
1664         unsigned u;
1665
1666         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC;
1667
1668         subframe->residual = decoder->private_->residual[channel];
1669         subframe->order = order;
1670
1671         /* read warm-up samples */
1672         for(u = 0; u < order; u++) {
1673                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, bps, read_callback_, decoder))
1674                         return false; /* the read_callback_ sets the state for us */
1675                 subframe->warmup[u] = i32;
1676         }
1677
1678         /* read qlp coeff precision */
1679         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN, read_callback_, decoder))
1680                 return false; /* the read_callback_ sets the state for us */
1681         if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) {
1682                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_LOST_SYNC, decoder->private_->client_data);
1683                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1684                 return true;
1685         }
1686         subframe->qlp_coeff_precision = u32+1;
1687
1688         /* read qlp shift */
1689         if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN, read_callback_, decoder))
1690                 return false; /* the read_callback_ sets the state for us */
1691         subframe->quantization_level = i32;
1692
1693         /* read quantized lp coefficiencts */
1694         for(u = 0; u < order; u++) {
1695                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision, read_callback_, decoder))
1696                         return false; /* the read_callback_ sets the state for us */
1697                 subframe->qlp_coeff[u] = i32;
1698         }
1699
1700         /* read entropy coding method info */
1701         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder))
1702                 return false; /* the read_callback_ sets the state for us */
1703         subframe->entropy_coding_method.type = u32;
1704         switch(subframe->entropy_coding_method.type) {
1705                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1706                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder))
1707                                 return false; /* the read_callback_ sets the state for us */
1708                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
1709                         break;
1710                 default:
1711                         decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1712                         return false;
1713         }
1714
1715         /* read residual */
1716         switch(subframe->entropy_coding_method.type) {
1717                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1718                         if(!stream_decoder_read_residual_partitioned_rice_(decoder, order, &subframe->entropy_coding_method.data.partitioned_rice, decoder->private_->residual[channel]))
1719                                 return false;
1720                         break;
1721                 default:
1722                         FLAC__ASSERT(0);
1723         }
1724
1725         /* decode the subframe */
1726         memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
1727         if(bps <= 16 && subframe->qlp_coeff_precision <= 16)
1728                 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);
1729         else
1730                 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);
1731
1732         return true;
1733 }
1734
1735 FLAC__bool stream_decoder_read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1736 {
1737         FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim;
1738         FLAC__int32 x, *residual = decoder->private_->residual[channel];
1739         unsigned i;
1740
1741         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM;
1742
1743         subframe->data = residual;
1744
1745         for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
1746                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &x, bps, read_callback_, decoder))
1747                         return false; /* the read_callback_ sets the state for us */
1748                 residual[i] = x;
1749         }
1750
1751         /* decode the subframe */
1752         memcpy(decoder->private_->output[channel], subframe->data, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
1753
1754         return true;
1755 }
1756
1757 FLAC__bool stream_decoder_read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, FLAC__EntropyCodingMethod_PartitionedRice *partitioned_rice, FLAC__int32 *residual)
1758 {
1759         FLAC__uint32 rice_parameter;
1760         int i;
1761         unsigned partition, sample, u;
1762         const unsigned partition_order = partitioned_rice->order;
1763         const unsigned partitions = 1u << partition_order;
1764         const unsigned partition_samples = partition_order > 0? decoder->private_->frame.header.blocksize >> partition_order : decoder->private_->frame.header.blocksize - predictor_order;
1765
1766         sample = 0;
1767         for(partition = 0; partition < partitions; partition++) {
1768                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN, read_callback_, decoder))
1769                         return false; /* the read_callback_ sets the state for us */
1770                 partitioned_rice->parameters[partition] = rice_parameter;
1771                 if(rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1772 #ifdef FLAC__SYMMETRIC_RICE
1773                         for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
1774                                 if(!FLAC__bitbuffer_read_symmetric_rice_signed(decoder->private_->input, &i, rice_parameter, read_callback_, decoder))
1775                                         return false; /* the read_callback_ sets the state for us */
1776                                 residual[sample] = i;
1777                         }
1778 #else
1779                         u = (partition_order == 0 || partition > 0)? partition_samples : partition_samples - predictor_order;
1780                         if(!FLAC__bitbuffer_read_rice_signed_block(decoder->private_->input, residual + sample, u, rice_parameter, read_callback_, decoder))
1781                                 return false; /* the read_callback_ sets the state for us */
1782                         sample += u;
1783 #endif
1784                 }
1785                 else {
1786                         if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN, read_callback_, decoder))
1787                                 return false; /* the read_callback_ sets the state for us */
1788                         partitioned_rice->raw_bits[partition] = rice_parameter;
1789                         for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
1790                                 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i, rice_parameter, read_callback_, decoder))
1791                                         return false; /* the read_callback_ sets the state for us */
1792                                 residual[sample] = i;
1793                         }
1794                 }
1795         }
1796
1797         return true;
1798 }
1799
1800 FLAC__bool stream_decoder_read_zero_padding_(FLAC__StreamDecoder *decoder)
1801 {
1802         if(!FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input)) {
1803                 FLAC__uint32 zero = 0;
1804                 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &zero, FLAC__bitbuffer_bits_left_for_byte_alignment(decoder->private_->input), read_callback_, decoder))
1805                         return false; /* the read_callback_ sets the state for us */
1806                 if(zero != 0) {
1807                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_LOST_SYNC, decoder->private_->client_data);
1808                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1809                 }
1810         }
1811         return true;
1812 }
1813
1814 FLAC__bool read_callback_(FLAC__byte buffer[], unsigned *bytes, void *client_data)
1815 {
1816         FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data;
1817         FLAC__StreamDecoderReadStatus status;
1818
1819         status = decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data);
1820         if(status == FLAC__STREAM_DECODER_READ_END_OF_STREAM)
1821                 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1822         else if(status == FLAC__STREAM_DECODER_READ_ABORT)
1823                 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
1824         return status == FLAC__STREAM_DECODER_READ_CONTINUE;
1825 }