src/libFLAC/stream_decoder.c

   1 /* libFLAC - Free Lossless Audio Codec library
   2  * Copyright (C) 2000,2001  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_find_metadata_(FLAC__StreamDecoder *decoder);
  47 static FLAC__bool stream_decoder_read_metadata_(FLAC__StreamDecoder *decoder);
  48 static FLAC__bool stream_decoder_skip_id3v2_tag_(FLAC__StreamDecoder *decoder);
  49 static FLAC__bool stream_decoder_frame_sync_(FLAC__StreamDecoder *decoder);
  50 static FLAC__bool stream_decoder_read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame);
  51 static FLAC__bool stream_decoder_read_frame_header_(FLAC__StreamDecoder *decoder);
  52 static FLAC__bool stream_decoder_read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  53 static FLAC__bool stream_decoder_read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  54 static FLAC__bool stream_decoder_read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order);
  55 static FLAC__bool stream_decoder_read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order);
  56 static FLAC__bool stream_decoder_read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
  57 static FLAC__bool stream_decoder_read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, FLAC__EntropyCodingMethod_PartitionedRice *partitioned_rice, FLAC__int32 *residual);
  58 static FLAC__bool stream_decoder_read_zero_padding_(FLAC__StreamDecoder *decoder);
  59 static FLAC__bool read_callback_(FLAC__byte buffer[], unsigned *bytes, void *client_data);
  60
  61 /***********************************************************************
  62  *
  63  * Private class data
  64  *
  65  ***********************************************************************/
  66
  67 typedef struct FLAC__StreamDecoderPrivate {
  68         FLAC__StreamDecoderReadStatus (*read_callback)(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data);
  69         FLAC__StreamDecoderWriteStatus (*write_callback)(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data);
  70         void (*metadata_callback)(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data);
  71         void (*error_callback)(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
  72         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[]);
  73         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[]);
  74         void *client_data;
  75         FLAC__BitBuffer input;
  76         FLAC__int32 *output[FLAC__MAX_CHANNELS];
  77         FLAC__int32 *residual[FLAC__MAX_CHANNELS];
  78         unsigned output_capacity, output_channels;
  79         FLAC__uint32 last_frame_number;
  80         FLAC__uint64 samples_decoded;
  81         FLAC__bool has_stream_info, has_seek_table;
  82         FLAC__StreamMetaData stream_info;
  83         FLAC__StreamMetaData seek_table;
  84         FLAC__Frame frame;
  85         FLAC__bool cached; /* true if there is a byte in lookahead */
  86         FLAC__CPUInfo cpuinfo;
  87         FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */
  88         FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */
  89 } FLAC__StreamDecoderPrivate;
  90
  91 /***********************************************************************
  92  *
  93  * Public static class data
  94  *
  95  ***********************************************************************/
  96
  97 const char *FLAC__StreamDecoderStateString[] = {
  98         "FLAC__STREAM_DECODER_SEARCH_FOR_METADATA",
  99         "FLAC__STREAM_DECODER_READ_METADATA",
 100         "FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC",
 101         "FLAC__STREAM_DECODER_READ_FRAME",
 102         "FLAC__STREAM_DECODER_END_OF_STREAM",
 103         "FLAC__STREAM_DECODER_ABORTED",
 104         "FLAC__STREAM_DECODER_UNPARSEABLE_STREAM",
 105         "FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR",
 106         "FLAC__STREAM_DECODER_ALREADY_INITIALIZED",
 107         "FLAC__STREAM_DECODER_INVALID_CALLBACK",
 108         "FLAC__STREAM_DECODER_UNINITIALIZED"
 109 };
 110
 111 const char *FLAC__StreamDecoderReadStatusString[] = {
 112         "FLAC__STREAM_DECODER_READ_CONTINUE",
 113         "FLAC__STREAM_DECODER_READ_END_OF_STREAM",
 114         "FLAC__STREAM_DECODER_READ_ABORT"
 115 };
 116
 117 const char *FLAC__StreamDecoderWriteStatusString[] = {
 118         "FLAC__STREAM_DECODER_WRITE_CONTINUE",
 119         "FLAC__STREAM_DECODER_WRITE_ABORT"
 120 };
 121
 122 const char *FLAC__StreamDecoderErrorStatusString[] = {
 123         "FLAC__STREAM_DECODER_ERROR_LOST_SYNC",
 124         "FLAC__STREAM_DECODER_ERROR_BAD_HEADER",
 125         "FLAC__STREAM_DECODER_ERROR_FRAME_CRC_MISMATCH"
 126 };
 127
 128 /***********************************************************************
 129  *
 130  * Class constructor/destructor
 131  *
 132  ***********************************************************************/
 133 FLAC__StreamDecoder *FLAC__stream_decoder_new()
 134 {
 135         FLAC__StreamDecoder *decoder;
 136
 137         FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
 138
 139         decoder = (FLAC__StreamDecoder*)malloc(sizeof(FLAC__StreamDecoder));
 140         if(decoder == 0) {
 141                 return 0;
 142         }
 143         decoder->protected_ = (FLAC__StreamDecoderProtected*)malloc(sizeof(FLAC__StreamDecoderProtected));
 144         if(decoder->protected_ == 0) {
 145                 free(decoder);
 146                 return 0;
 147         }
 148         decoder->private_ = (FLAC__StreamDecoderPrivate*)malloc(sizeof(FLAC__StreamDecoderPrivate));
 149         if(decoder->private_ == 0) {
 150                 free(decoder->protected_);
 151                 free(decoder);
 152                 return 0;
 153         }
 154
 155         decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
 156
 157         decoder->private_->read_callback = 0;
 158         decoder->private_->write_callback = 0;
 159         decoder->private_->metadata_callback = 0;
 160         decoder->private_->error_callback = 0;
 161         decoder->private_->client_data = 0;
 162
 163         return decoder;
 164 }
 165
 166 void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder)
 167 {
 168         FLAC__ASSERT(decoder != 0);
 169         FLAC__ASSERT(decoder->protected_ != 0);
 170         FLAC__ASSERT(decoder->private_ != 0);
 171
 172         free(decoder->private_);
 173         free(decoder->protected_);
 174         free(decoder);
 175 }
 176
 177 /***********************************************************************
 178  *
 179  * Public class methods
 180  *
 181  ***********************************************************************/
 182
 183 FLAC__StreamDecoderState FLAC__stream_decoder_init(FLAC__StreamDecoder *decoder)
 184 {
 185         unsigned i;
 186
 187         FLAC__ASSERT(decoder != 0);
 188
 189         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 190                 return decoder->protected_->state = FLAC__STREAM_DECODER_ALREADY_INITIALIZED;
 191
 192         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
 193
 194         if(0 == decoder->private_->read_callback || 0 == decoder->private_->write_callback || 0 == decoder->private_->metadata_callback || 0 == decoder->private_->error_callback)
 195                 return decoder->protected_->state = FLAC__STREAM_DECODER_INVALID_CALLBACK;
 196
 197         FLAC__bitbuffer_init(&decoder->private_->input);
 198
 199         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 200                 decoder->private_->output[i] = 0;
 201                 decoder->private_->residual[i] = 0;
 202         }
 203
 204         decoder->private_->output_capacity = 0;
 205         decoder->private_->output_channels = 0;
 206         decoder->private_->last_frame_number = 0;
 207         decoder->private_->samples_decoded = 0;
 208         decoder->private_->has_stream_info = false;
 209         decoder->private_->has_seek_table = false;
 210         decoder->private_->cached = false;
 211
 212         /*
 213          * get the CPU info and set the function pointers
 214          */
 215         FLAC__cpu_info(&decoder->private_->cpuinfo);
 216         /* first default to the non-asm routines */
 217         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal;
 218         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal;
 219         /* now override with asm where appropriate */
 220 #ifndef FLAC__NO_ASM
 221         if(decoder->private_->cpuinfo.use_asm) {
 222 #ifdef FLAC__CPU_IA32
 223                 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
 224 #ifdef FLAC__HAS_NASM
 225                 if(decoder->private_->cpuinfo.data.ia32.mmx) {
 226                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
 227                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32_mmx;
 228                 }
 229                 else {
 230                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
 231                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32;
 232                 }
 233 #endif
 234 #endif
 235         }
 236 #endif
 237
 238         return decoder->protected_->state;
 239 }
 240
 241 void FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder)
 242 {
 243         unsigned i;
 244         FLAC__ASSERT(decoder != 0);
 245         if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
 246                 return;
 247         if(decoder->private_->has_seek_table) {
 248                 free(decoder->private_->seek_table.data.seek_table.points);
 249                 decoder->private_->seek_table.data.seek_table.points = 0;
 250         }
 251         FLAC__bitbuffer_free(&decoder->private_->input);
 252         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 253                 /* 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. */
 254                 if(decoder->private_->output[i] != 0) {
 255                         free(decoder->private_->output[i]-4);
 256                         decoder->private_->output[i] = 0;
 257                 }
 258                 if(decoder->private_->residual[i] != 0) {
 259                         free(decoder->private_->residual[i]);
 260                         decoder->private_->residual[i] = 0;
 261                 }
 262         }
 263         decoder->private_->output_capacity = 0;
 264         decoder->private_->output_channels = 0;
 265         decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
 266 }
 267
 268 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))
 269 {
 270         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 271                 return false;
 272         decoder->private_->read_callback = value;
 273         return true;
 274 }
 275
 276 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))
 277 {
 278         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 279                 return false;
 280         decoder->private_->write_callback = value;
 281         return true;
 282 }
 283
 284 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))
 285 {
 286         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 287                 return false;
 288         decoder->private_->metadata_callback = value;
 289         return true;
 290 }
 291
 292 FLAC__bool FLAC__stream_decoder_set_error_callback(const FLAC__StreamDecoder *decoder, void (*value)(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data))
 293 {
 294         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 295                 return false;
 296         decoder->private_->error_callback = value;
 297         return true;
 298 }
 299
 300 FLAC__bool FLAC__stream_decoder_set_client_data(const FLAC__StreamDecoder *decoder, void *value)
 301 {
 302         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 303                 return false;
 304         decoder->private_->client_data = value;
 305         return true;
 306 }
 307
 308 FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder)
 309 {
 310         return decoder->protected_->state;
 311 }
 312
 313 unsigned FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder)
 314 {
 315         return decoder->protected_->channels;
 316 }
 317
 318 FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder)
 319 {
 320         return decoder->protected_->channel_assignment;
 321 }
 322
 323 unsigned FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder)
 324 {
 325         return decoder->protected_->bits_per_sample;
 326 }
 327
 328 unsigned FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder)
 329 {
 330         return decoder->protected_->sample_rate;
 331 }
 332
 333 unsigned FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder)
 334 {
 335         return decoder->protected_->blocksize;
 336 }
 337
 338 FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder)
 339 {
 340         FLAC__ASSERT(decoder != 0);
 341
 342         if(!FLAC__bitbuffer_clear(&decoder->private_->input)) {
 343                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 344                 return false;
 345         }
 346         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 347
 348         return true;
 349 }
 350
 351 FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder)
 352 {
 353         FLAC__ASSERT(decoder != 0);
 354
 355         if(!FLAC__stream_decoder_flush(decoder)) {
 356                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 357                 return false;
 358         }
 359         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
 360
 361         decoder->private_->samples_decoded = 0;
 362
 363         return true;
 364 }
 365
 366 FLAC__bool FLAC__stream_decoder_process_whole_stream(FLAC__StreamDecoder *decoder)
 367 {
 368         FLAC__bool dummy;
 369         FLAC__ASSERT(decoder != 0);
 370
 371         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 372                 return true;
 373
 374         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA);
 375
 376         if(!FLAC__stream_decoder_reset(decoder)) {
 377                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 378                 return false;
 379         }
 380
 381         while(1) {
 382                 switch(decoder->protected_->state) {
 383                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
 384                                 if(!stream_decoder_find_metadata_(decoder))
 385                                         return false; /* above function sets the status for us */
 386                                 break;
 387                         case FLAC__STREAM_DECODER_READ_METADATA:
 388                                 if(!stream_decoder_read_metadata_(decoder))
 389                                         return false; /* above function sets the status for us */
 390                                 break;
 391                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 392                                 if(!stream_decoder_frame_sync_(decoder))
 393                                         return true; /* above function sets the status for us */
 394                                 break;
 395                         case FLAC__STREAM_DECODER_READ_FRAME:
 396                                 if(!stream_decoder_read_frame_(decoder, &dummy))
 397                                         return false; /* above function sets the status for us */
 398                                 break;
 399                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 400                                 return true;
 401                         default:
 402                                 FLAC__ASSERT(0);
 403                 }
 404         }
 405 }
 406
 407 FLAC__bool FLAC__stream_decoder_process_metadata(FLAC__StreamDecoder *decoder)
 408 {
 409         FLAC__ASSERT(decoder != 0);
 410
 411         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 412                 return true;
 413
 414         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA);
 415
 416         if(!FLAC__stream_decoder_reset(decoder)) {
 417                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 418                 return false;
 419         }
 420
 421         while(1) {
 422                 switch(decoder->protected_->state) {
 423                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
 424                                 if(!stream_decoder_find_metadata_(decoder))
 425                                         return false; /* above function sets the status for us */
 426                                 break;
 427                         case FLAC__STREAM_DECODER_READ_METADATA:
 428                                 if(!stream_decoder_read_metadata_(decoder))
 429                                         return false; /* above function sets the status for us */
 430                                 break;
 431                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 432                                 return true;
 433                                 break;
 434                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 435                                 return true;
 436                         default:
 437                                 FLAC__ASSERT(0);
 438                 }
 439         }
 440 }
 441
 442 FLAC__bool FLAC__stream_decoder_process_one_frame(FLAC__StreamDecoder *decoder)
 443 {
 444         FLAC__bool got_a_frame;
 445         FLAC__ASSERT(decoder != 0);
 446
 447         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 448                 return true;
 449
 450         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC);
 451
 452         while(1) {
 453                 switch(decoder->protected_->state) {
 454                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 455                                 if(!stream_decoder_frame_sync_(decoder))
 456                                         return true; /* above function sets the status for us */
 457                                 break;
 458                         case FLAC__STREAM_DECODER_READ_FRAME:
 459                                 if(!stream_decoder_read_frame_(decoder, &got_a_frame))
 460                                         return false; /* above function sets the status for us */
 461                                 if(got_a_frame)
 462                                         return true; /* above function sets the status for us */
 463                                 break;
 464                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 465                                 return true;
 466                         default:
 467                                 FLAC__ASSERT(0);
 468                 }
 469         }
 470 }
 471
 472 FLAC__bool FLAC__stream_decoder_process_remaining_frames(FLAC__StreamDecoder *decoder)
 473 {
 474         FLAC__bool dummy;
 475         FLAC__ASSERT(decoder != 0);
 476
 477         if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
 478                 return true;
 479
 480         FLAC__ASSERT(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC);
 481
 482         while(1) {
 483                 switch(decoder->protected_->state) {
 484                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 485                                 if(!stream_decoder_frame_sync_(decoder))
 486                                         return true; /* above function sets the status for us */
 487                                 break;
 488                         case FLAC__STREAM_DECODER_READ_FRAME:
 489                                 if(!stream_decoder_read_frame_(decoder, &dummy))
 490                                         return false; /* above function sets the status for us */
 491                                 break;
 492                         case FLAC__STREAM_DECODER_END_OF_STREAM:
 493                                 return true;
 494                         default:
 495                                 FLAC__ASSERT(0);
 496                 }
 497         }
 498 }
 499
 500 /***********************************************************************
 501  *
 502  * Protected class methods
 503  *
 504  ***********************************************************************/
 505
 506 unsigned FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder)
 507 {
 508         FLAC__ASSERT(decoder != 0);
 509         return decoder->private_->input.bytes - decoder->private_->input.consumed_bytes;
 510 }
 511
 512 /***********************************************************************
 513  *
 514  * Private class methods
 515  *
 516  ***********************************************************************/
 517
 518 FLAC__bool stream_decoder_allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels)
 519 {
 520         unsigned i;
 521         FLAC__int32 *tmp;
 522
 523         if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels)
 524                 return true;
 525
 526         /* @@@ should change to use realloc() */
 527
 528         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 529                 if(decoder->private_->output[i] != 0) {
 530                         free(decoder->private_->output[i]);
 531                         decoder->private_->output[i] = 0;
 532                 }
 533                 if(decoder->private_->residual[i] != 0) {
 534                         free(decoder->private_->residual[i]);
 535                         decoder->private_->residual[i] = 0;
 536                 }
 537         }
 538
 539         for(i = 0; i < channels; i++) {
 540                 /* 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. */
 541                 tmp = (FLAC__int32*)malloc(sizeof(FLAC__int32)*(size+4));
 542                 if(tmp == 0) {
 543                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 544                         return false;
 545                 }
 546                 memset(tmp, 0, sizeof(FLAC__int32)*4);
 547                 decoder->private_->output[i] = tmp + 4;
 548
 549                 tmp = (FLAC__int32*)malloc(sizeof(FLAC__int32)*size);
 550                 if(tmp == 0) {
 551                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 552                         return false;
 553                 }
 554                 decoder->private_->residual[i] = tmp;
 555         }
 556
 557         decoder->private_->output_capacity = size;
 558         decoder->private_->output_channels = channels;
 559
 560         return true;
 561 }
 562
 563 FLAC__bool stream_decoder_find_metadata_(FLAC__StreamDecoder *decoder)
 564 {
 565         FLAC__uint32 x;
 566         unsigned i, id;
 567         FLAC__bool first = true;
 568
 569         FLAC__ASSERT(decoder->private_->input.consumed_bits == 0); /* make sure we're byte aligned */
 570
 571         for(i = id = 0; i < 4; ) {
 572                 if(decoder->private_->cached) {
 573                         x = (FLAC__uint32)decoder->private_->lookahead;
 574                         decoder->private_->cached = false;
 575                 }
 576                 else {
 577                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
 578                                 return false; /* the read_callback_ sets the state for us */
 579                 }
 580                 if(x == FLAC__STREAM_SYNC_STRING[i]) {
 581                         first = true;
 582                         i++;
 583                         id = 0;
 584                         continue;
 585                 }
 586                 if(x == ID3V2_TAG_[id]) {
 587                         id++;
 588                         i = 0;
 589                         if(id == 3) {
 590                                 if(!stream_decoder_skip_id3v2_tag_(decoder))
 591                                         return false; /* the read_callback_ sets the state for us */
 592                         }
 593                         continue;
 594                 }
 595                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 596                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
 597                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
 598                                 return false; /* the read_callback_ sets the state for us */
 599
 600                         /* 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 */
 601                         /* else we have to check if the second byte is the end of a sync code */
 602                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 603                                 decoder->private_->lookahead = (FLAC__byte)x;
 604                                 decoder->private_->cached = true;
 605                         }
 606                         else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
 607                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
 608                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
 609                                 return true;
 610                         }
 611                 }
 612                 i = 0;
 613                 if(first) {
 614                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_LOST_SYNC, decoder->private_->client_data);
 615                         first = false;
 616                 }
 617         }
 618
 619         decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA;
 620         return true;
 621 }
 622
 623 FLAC__bool stream_decoder_read_metadata_(FLAC__StreamDecoder *decoder)
 624 {
 625         FLAC__uint32 i, x, last_block, type, length;
 626         FLAC__uint64 xx;
 627
 628         FLAC__ASSERT(decoder->private_->input.consumed_bits == 0); /* make sure we're byte aligned */
 629
 630         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &last_block, FLAC__STREAM_METADATA_IS_LAST_LEN, read_callback_, decoder))
 631                 return false; /* the read_callback_ sets the state for us */
 632         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN, read_callback_, decoder))
 633                 return false; /* the read_callback_ sets the state for us */
 634         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN, read_callback_, decoder))
 635                 return false; /* the read_callback_ sets the state for us */
 636         if(type == FLAC__METADATA_TYPE_STREAMINFO) {
 637                 unsigned used_bits = 0;
 638                 decoder->private_->stream_info.type = type;
 639                 decoder->private_->stream_info.is_last = last_block;
 640                 decoder->private_->stream_info.length = length;
 641
 642                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN, read_callback_, decoder))
 643                         return false; /* the read_callback_ sets the state for us */
 644                 decoder->private_->stream_info.data.stream_info.min_blocksize = x;
 645                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN;
 646
 647                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN, read_callback_, decoder))
 648                         return false; /* the read_callback_ sets the state for us */
 649                 decoder->private_->stream_info.data.stream_info.max_blocksize = x;
 650                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN;
 651
 652                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN, read_callback_, decoder))
 653                         return false; /* the read_callback_ sets the state for us */
 654                 decoder->private_->stream_info.data.stream_info.min_framesize = x;
 655                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN;
 656
 657                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN, read_callback_, decoder))
 658                         return false; /* the read_callback_ sets the state for us */
 659                 decoder->private_->stream_info.data.stream_info.max_framesize = x;
 660                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN;
 661
 662                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN, read_callback_, decoder))
 663                         return false; /* the read_callback_ sets the state for us */
 664                 decoder->private_->stream_info.data.stream_info.sample_rate = x;
 665                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN;
 666
 667                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN, read_callback_, decoder))
 668                         return false; /* the read_callback_ sets the state for us */
 669                 decoder->private_->stream_info.data.stream_info.channels = x+1;
 670                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN;
 671
 672                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN, read_callback_, decoder))
 673                         return false; /* the read_callback_ sets the state for us */
 674                 decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1;
 675                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN;
 676
 677                 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))
 678                         return false; /* the read_callback_ sets the state for us */
 679                 used_bits += FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN;
 680
 681                 for(i = 0; i < 16; i++) {
 682                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
 683                                 return false; /* the read_callback_ sets the state for us */
 684                         decoder->private_->stream_info.data.stream_info.md5sum[i] = (FLAC__byte)x;
 685                 }
 686                 used_bits += i*8;
 687
 688                 /* skip the rest of the block */
 689                 FLAC__ASSERT(used_bits % 8 == 0);
 690                 length -= (used_bits / 8);
 691                 for(i = 0; i < length; i++) {
 692                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
 693                                 return false; /* the read_callback_ sets the state for us */
 694                 }
 695
 696                 decoder->private_->has_stream_info = true;
 697                 decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data);
 698         }
 699         else if(type == FLAC__METADATA_TYPE_SEEKTABLE) {
 700                 unsigned real_points;
 701
 702                 decoder->private_->seek_table.type = type;
 703                 decoder->private_->seek_table.is_last = last_block;
 704                 decoder->private_->seek_table.length = length;
 705
 706                 decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LEN;
 707
 708                 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)))) {
 709                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 710                         return false;
 711                 }
 712                 for(i = real_points = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) {
 713                         if(!FLAC__bitbuffer_read_raw_uint64(&decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN, read_callback_, decoder))
 714                                 return false; /* the read_callback_ sets the state for us */
 715                         decoder->private_->seek_table.data.seek_table.points[real_points].sample_number = xx;
 716
 717                         if(!FLAC__bitbuffer_read_raw_uint64(&decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN, read_callback_, decoder))
 718                                 return false; /* the read_callback_ sets the state for us */
 719                         decoder->private_->seek_table.data.seek_table.points[real_points].stream_offset = xx;
 720
 721                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN, read_callback_, decoder))
 722                                 return false; /* the read_callback_ sets the state for us */
 723                         decoder->private_->seek_table.data.seek_table.points[real_points].frame_samples = x;
 724
 725                         if(decoder->private_->seek_table.data.seek_table.points[real_points].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER)
 726                                 real_points++;
 727                 }
 728                 decoder->private_->seek_table.data.seek_table.num_points = real_points;
 729
 730                 decoder->private_->has_seek_table = true;
 731                 decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data);
 732         }
 733         else {
 734                 /* skip other metadata blocks */
 735                 for(i = 0; i < length; i++) {
 736                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
 737                                 return false; /* the read_callback_ sets the state for us */
 738                 }
 739         }
 740
 741         if(last_block)
 742                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 743
 744         return true;
 745 }
 746
 747 FLAC__bool stream_decoder_skip_id3v2_tag_(FLAC__StreamDecoder *decoder)
 748 {
 749         FLAC__uint32 x;
 750         unsigned i, skip;
 751
 752         /* skip the version and flags bytes */
 753         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 24, read_callback_, decoder))
 754                 return false; /* the read_callback_ sets the state for us */
 755         /* get the size (in bytes) to skip */
 756         skip = 0;
 757         for(i = 0; i < 4; i++) {
 758                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
 759                         return false; /* the read_callback_ sets the state for us */
 760                 skip <<= 7;
 761                 skip |= (x & 0x7f);
 762         }
 763         /* skip the rest of the tag */
 764         for(i = 0; i < skip; i++) {
 765                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
 766                         return false; /* the read_callback_ sets the state for us */
 767         }
 768         return true;
 769 }
 770
 771 FLAC__bool stream_decoder_frame_sync_(FLAC__StreamDecoder *decoder)
 772 {
 773         FLAC__uint32 x;
 774         FLAC__bool first = true;
 775
 776         /* If we know the total number of samples in the stream, stop if we've read that many. */
 777         /* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */
 778         if(decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.total_samples) {
 779                 if(decoder->private_->samples_decoded >= decoder->private_->stream_info.data.stream_info.total_samples) {
 780                         decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
 781                         return true;
 782                 }
 783         }
 784
 785         /* make sure we're byte aligned */
 786         if(decoder->private_->input.consumed_bits != 0) {
 787                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8-decoder->private_->input.consumed_bits, read_callback_, decoder))
 788                         return false; /* the read_callback_ sets the state for us */
 789         }
 790
 791         while(1) {
 792                 if(decoder->private_->cached) {
 793                         x = (FLAC__uint32)decoder->private_->lookahead;
 794                         decoder->private_->cached = false;
 795                 }
 796                 else {
 797                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
 798                                 return false; /* the read_callback_ sets the state for us */
 799                 }
 800                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 801                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
 802                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
 803                                 return false; /* the read_callback_ sets the state for us */
 804
 805                         /* 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 */
 806                         /* else we have to check if the second byte is the end of a sync code */
 807                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 808                                 decoder->private_->lookahead = (FLAC__byte)x;
 809                                 decoder->private_->cached = true;
 810                         }
 811                         else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
 812                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
 813                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
 814                                 return true;
 815                         }
 816                 }
 817                 if(first) {
 818                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_LOST_SYNC, decoder->private_->client_data);
 819                         first = 0;
 820                 }
 821         }
 822
 823         return true;
 824 }
 825
 826 FLAC__bool stream_decoder_read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame)
 827 {
 828         unsigned channel;
 829         unsigned i;
 830         FLAC__int32 mid, side, left, right;
 831         FLAC__uint16 frame_crc; /* the one we calculate from the input stream */
 832         FLAC__uint32 x;
 833
 834         *got_a_frame = false;
 835
 836         /* init the CRC */
 837         frame_crc = 0;
 838         FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc);
 839         FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc);
 840         FLAC__bitbuffer_init_read_crc16(&decoder->private_->input, frame_crc);
 841
 842         if(!stream_decoder_read_frame_header_(decoder))
 843                 return false;
 844         if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC)
 845                 return true;
 846         if(!stream_decoder_allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels))
 847                 return false;
 848         for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
 849                 /*
 850                  * first figure the correct bits-per-sample of the subframe
 851                  */
 852                 unsigned bps = decoder->private_->frame.header.bits_per_sample;
 853                 switch(decoder->private_->frame.header.channel_assignment) {
 854                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
 855                                 /* no adjustment needed */
 856                                 break;
 857                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
 858                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
 859                                 if(channel == 1)
 860                                         bps++;
 861                                 break;
 862                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
 863                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
 864                                 if(channel == 0)
 865                                         bps++;
 866                                 break;
 867                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
 868                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
 869                                 if(channel == 1)
 870                                         bps++;
 871                                 break;
 872                         default:
 873                                 FLAC__ASSERT(0);
 874                 }
 875                 /*
 876                  * now read it
 877                  */
 878                 if(!stream_decoder_read_subframe_(decoder, channel, bps))
 879                         return false;
 880                 if(decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME) {
 881                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 882                         return true;
 883                 }
 884         }
 885         if(!stream_decoder_read_zero_padding_(decoder))
 886                 return false;
 887
 888         /*
 889          * Read the frame CRC-16 from the footer and check
 890          */
 891         frame_crc = decoder->private_->input.read_crc16;
 892         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN, read_callback_, decoder))
 893                 return false; /* the read_callback_ sets the state for us */
 894         if(frame_crc == (FLAC__uint16)x) {
 895                 /* Undo any special channel coding */
 896                 switch(decoder->private_->frame.header.channel_assignment) {
 897                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
 898                                 /* do nothing */
 899                                 break;
 900                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
 901                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
 902                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
 903                                         decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i];
 904                                 break;
 905                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
 906                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
 907                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
 908                                         decoder->private_->output[0][i] += decoder->private_->output[1][i];
 909                                 break;
 910                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
 911                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
 912                                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
 913                                         mid = decoder->private_->output[0][i];
 914                                         side = decoder->private_->output[1][i];
 915                                         mid <<= 1;
 916                                         if(side & 1) /* i.e. if 'side' is odd... */
 917                                                 mid++;
 918                                         left = mid + side;
 919                                         right = mid - side;
 920                                         decoder->private_->output[0][i] = left >> 1;
 921                                         decoder->private_->output[1][i] = right >> 1;
 922                                 }
 923                                 break;
 924                         default:
 925                                 FLAC__ASSERT(0);
 926                                 break;
 927                 }
 928         }
 929         else {
 930                 /* Bad frame, emit error and zero the output signal */
 931                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_FRAME_CRC_MISMATCH, decoder->private_->client_data);
 932                 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
 933                         memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
 934                 }
 935         }
 936
 937         *got_a_frame = true;
 938
 939         /* put the latest values into the public section of the decoder instance */
 940         decoder->protected_->channels = decoder->private_->frame.header.channels;
 941         decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment;
 942         decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample;
 943         decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate;
 944         decoder->protected_->blocksize = decoder->private_->frame.header.blocksize;
 945
 946         FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
 947         decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize;
 948
 949         /* write it */
 950         /* 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: */
 951         if(decoder->private_->write_callback(decoder, &decoder->private_->frame, decoder->private_->output, decoder->private_->client_data) != FLAC__STREAM_DECODER_WRITE_CONTINUE)
 952                 return false;
 953
 954         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 955         return true;
 956 }
 957
 958 FLAC__bool stream_decoder_read_frame_header_(FLAC__StreamDecoder *decoder)
 959 {
 960         FLAC__uint32 x;
 961         FLAC__uint64 xx;
 962         unsigned i, blocksize_hint = 0, sample_rate_hint = 0;
 963         FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */
 964         unsigned raw_header_len;
 965         FLAC__bool is_unparseable = false;
 966         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);
 967         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);
 968
 969         FLAC__ASSERT(decoder->private_->input.consumed_bits == 0); /* make sure we're byte aligned */
 970
 971         /* init the raw header with the saved bits from synchronization */
 972         raw_header[0] = decoder->private_->header_warmup[0];
 973         raw_header[1] = decoder->private_->header_warmup[1];
 974         raw_header_len = 2;
 975
 976         /*
 977          * check to make sure that the reserved bits are 0
 978          */
 979         if(raw_header[1] & 0x03) { /* MAGIC NUMBER */
 980                 is_unparseable = true;
 981         }
 982
 983         /*
 984          * Note that along the way as we read the header, we look for a sync
 985          * code inside.  If we find one it would indicate that our original
 986          * sync was bad since there cannot be a sync code in a valid header.
 987          */
 988
 989         /*
 990          * read in the raw header as bytes so we can CRC it, and parse it on the way
 991          */
 992         for(i = 0; i < 2; i++) {
 993                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
 994                         return false; /* the read_callback_ sets the state for us */
 995                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
 996                         /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */
 997                         decoder->private_->lookahead = (FLAC__byte)x;
 998                         decoder->private_->cached = true;
 999                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private_->client_data);
1000                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1001                         return true;
1002                 }
1003                 raw_header[raw_header_len++] = (FLAC__byte)x;
1004         }
1005
1006         switch(x = raw_header[2] >> 4) {
1007                 case 0:
1008                         if(is_known_fixed_blocksize_stream)
1009                                 decoder->private_->frame.header.blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize;
1010                         else
1011                                 is_unparseable = true;
1012                         break;
1013                 case 1:
1014                         decoder->private_->frame.header.blocksize = 192;
1015                         break;
1016                 case 2:
1017                 case 3:
1018                 case 4:
1019                 case 5:
1020                         decoder->private_->frame.header.blocksize = 576 << (x-2);
1021                         break;
1022                 case 6:
1023                 case 7:
1024                         blocksize_hint = x;
1025                         break;
1026                 case 8:
1027                 case 9:
1028                 case 10:
1029                 case 11:
1030                 case 12:
1031                 case 13:
1032                 case 14:
1033                 case 15:
1034                         decoder->private_->frame.header.blocksize = 256 << (x-8);
1035                         break;
1036                 default:
1037                         FLAC__ASSERT(0);
1038                         break;
1039         }
1040
1041         switch(x = raw_header[2] & 0x0f) {
1042                 case 0:
1043                         if(decoder->private_->has_stream_info)
1044                                 decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate;
1045                         else
1046                                 is_unparseable = true;
1047                         break;
1048                 case 1:
1049                 case 2:
1050                 case 3:
1051                         is_unparseable = true;
1052                         break;
1053                 case 4:
1054                         decoder->private_->frame.header.sample_rate = 8000;
1055                         break;
1056                 case 5:
1057                         decoder->private_->frame.header.sample_rate = 16000;
1058                         break;
1059                 case 6:
1060                         decoder->private_->frame.header.sample_rate = 22050;
1061                         break;
1062                 case 7:
1063                         decoder->private_->frame.header.sample_rate = 24000;
1064                         break;
1065                 case 8:
1066                         decoder->private_->frame.header.sample_rate = 32000;
1067                         break;
1068                 case 9:
1069                         decoder->private_->frame.header.sample_rate = 44100;
1070                         break;
1071                 case 10:
1072                         decoder->private_->frame.header.sample_rate = 48000;
1073                         break;
1074                 case 11:
1075                         decoder->private_->frame.header.sample_rate = 96000;
1076                         break;
1077                 case 12:
1078                 case 13:
1079                 case 14:
1080                         sample_rate_hint = x;
1081                         break;
1082                 case 15:
1083                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private_->client_data);
1084                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1085                         return true;
1086                 default:
1087                         FLAC__ASSERT(0);
1088         }
1089
1090         x = (unsigned)(raw_header[3] >> 4);
1091         if(x & 8) {
1092                 decoder->private_->frame.header.channels = 2;
1093                 switch(x & 7) {
1094                         case 0:
1095                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE;
1096                                 break;
1097                         case 1:
1098                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE;
1099                                 break;
1100                         case 2:
1101                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE;
1102                                 break;
1103                         default:
1104                                 is_unparseable = true;
1105                                 break;
1106                 }
1107         }
1108         else {
1109                 decoder->private_->frame.header.channels = (unsigned)x + 1;
1110                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT;
1111         }
1112
1113         switch(x = (unsigned)(raw_header[3] & 0x0e) >> 1) {
1114                 case 0:
1115                         if(decoder->private_->has_stream_info)
1116                                 decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample;
1117                         else
1118                                 is_unparseable = true;
1119                         break;
1120                 case 1:
1121                         decoder->private_->frame.header.bits_per_sample = 8;
1122                         break;
1123                 case 2:
1124                         decoder->private_->frame.header.bits_per_sample = 12;
1125                         break;
1126                 case 4:
1127                         decoder->private_->frame.header.bits_per_sample = 16;
1128                         break;
1129                 case 5:
1130                         decoder->private_->frame.header.bits_per_sample = 20;
1131                         break;
1132                 case 6:
1133                         decoder->private_->frame.header.bits_per_sample = 24;
1134                         break;
1135                 case 3:
1136                 case 7:
1137                         is_unparseable = true;
1138                         break;
1139                 default:
1140                         FLAC__ASSERT(0);
1141                         break;
1142         }
1143
1144         if(raw_header[3] & 0x01) { /* this should be a zero padding bit */
1145                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private_->client_data);
1146                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1147                 return true;
1148         }
1149
1150         if(blocksize_hint && is_known_variable_blocksize_stream) {
1151                 if(!FLAC__bitbuffer_read_utf8_uint64(&decoder->private_->input, &xx, read_callback_, decoder, raw_header, &raw_header_len))
1152                         return false; /* the read_callback_ sets the state for us */
1153                 if(xx == 0xffffffffffffffff) { /* i.e. non-UTF8 code... */
1154                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
1155                         decoder->private_->cached = true;
1156                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private_->client_data);
1157                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1158                         return true;
1159                 }
1160                 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
1161                 decoder->private_->frame.header.number.sample_number = xx;
1162         }
1163         else {
1164                 if(!FLAC__bitbuffer_read_utf8_uint32(&decoder->private_->input, &x, read_callback_, decoder, raw_header, &raw_header_len))
1165                         return false; /* the read_callback_ sets the state for us */
1166                 if(x == 0xffffffff) { /* i.e. non-UTF8 code... */
1167                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
1168                         decoder->private_->cached = true;
1169                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private_->client_data);
1170                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1171                         return true;
1172                 }
1173                 decoder->private_->last_frame_number = x;
1174                 if(decoder->private_->has_stream_info) {
1175                         decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
1176                         decoder->private_->frame.header.number.sample_number = (FLAC__int64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__int64)x;
1177                 }
1178                 else {
1179                         is_unparseable = true;
1180                 }
1181         }
1182
1183         if(blocksize_hint) {
1184                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
1185                         return false; /* the read_callback_ sets the state for us */
1186                 raw_header[raw_header_len++] = (FLAC__byte)x;
1187                 if(blocksize_hint == 7) {
1188                         FLAC__uint32 _x;
1189                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &_x, 8, read_callback_, decoder))
1190                                 return false; /* the read_callback_ sets the state for us */
1191                         raw_header[raw_header_len++] = (FLAC__byte)_x;
1192                         x = (x << 8) | _x;
1193                 }
1194                 decoder->private_->frame.header.blocksize = x+1;
1195         }
1196
1197         if(sample_rate_hint) {
1198                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
1199                         return false; /* the read_callback_ sets the state for us */
1200                 raw_header[raw_header_len++] = (FLAC__byte)x;
1201                 if(sample_rate_hint != 12) {
1202                         FLAC__uint32 _x;
1203                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &_x, 8, read_callback_, decoder))
1204                                 return false; /* the read_callback_ sets the state for us */
1205                         raw_header[raw_header_len++] = (FLAC__byte)_x;
1206                         x = (x << 8) | _x;
1207                 }
1208                 if(sample_rate_hint == 12)
1209                         decoder->private_->frame.header.sample_rate = x*1000;
1210                 else if(sample_rate_hint == 13)
1211                         decoder->private_->frame.header.sample_rate = x;
1212                 else
1213                         decoder->private_->frame.header.sample_rate = x*10;
1214         }
1215
1216         /* read the CRC-8 byte */
1217         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder))
1218                 return false; /* the read_callback_ sets the state for us */
1219         crc8 = (FLAC__byte)x;
1220
1221         if(FLAC__crc8(raw_header, raw_header_len) != crc8) {
1222                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_BAD_HEADER, decoder->private_->client_data);
1223                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1224                 return true;
1225         }
1226
1227         if(is_unparseable) {
1228                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1229                 return false;
1230         }
1231
1232         return true;
1233 }
1234
1235 FLAC__bool stream_decoder_read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1236 {
1237         FLAC__uint32 x;
1238         FLAC__bool wasted_bits;
1239
1240         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &x, 8, read_callback_, decoder)) /* MAGIC NUMBER */
1241                 return false; /* the read_callback_ sets the state for us */
1242
1243         wasted_bits = (x & 1);
1244         x &= 0xfe;
1245
1246         if(wasted_bits) {
1247                 unsigned u;
1248                 if(!FLAC__bitbuffer_read_unary_unsigned(&decoder->private_->input, &u, read_callback_, decoder))
1249                         return false; /* the read_callback_ sets the state for us */
1250                 decoder->private_->frame.subframes[channel].wasted_bits = u+1;
1251                 bps -= decoder->private_->frame.subframes[channel].wasted_bits;
1252         }
1253         else
1254                 decoder->private_->frame.subframes[channel].wasted_bits = 0;
1255
1256         /*
1257          * Lots of magic numbers here
1258          */
1259         if(x & 0x80) {
1260                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_LOST_SYNC, decoder->private_->client_data);
1261                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1262                 return true;
1263         }
1264         else if(x == 0) {
1265                 if(!stream_decoder_read_subframe_constant_(decoder, channel, bps))
1266                         return false;
1267         }
1268         else if(x == 2) {
1269                 if(!stream_decoder_read_subframe_verbatim_(decoder, channel, bps))
1270                         return false;
1271         }
1272         else if(x < 16) {
1273                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1274                 return false;
1275         }
1276         else if(x <= 24) {
1277                 if(!stream_decoder_read_subframe_fixed_(decoder, channel, bps, (x>>1)&7))
1278                         return false;
1279         }
1280         else if(x < 64) {
1281                 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1282                 return false;
1283         }
1284         else {
1285                 if(!stream_decoder_read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1))
1286                         return false;
1287         }
1288
1289         if(wasted_bits) {
1290                 unsigned i;
1291                 x = decoder->private_->frame.subframes[channel].wasted_bits;
1292                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1293                         decoder->private_->output[channel][i] <<= x;
1294         }
1295
1296         return true;
1297 }
1298
1299 FLAC__bool stream_decoder_read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1300 {
1301         FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant;
1302         FLAC__int32 x;
1303         unsigned i;
1304         FLAC__int32 *output = decoder->private_->output[channel];
1305
1306         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT;
1307
1308         if(!FLAC__bitbuffer_read_raw_int32(&decoder->private_->input, &x, bps, read_callback_, decoder))
1309                 return false; /* the read_callback_ sets the state for us */
1310
1311         subframe->value = x;
1312
1313         /* decode the subframe */
1314         for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1315                 output[i] = x;
1316
1317         return true;
1318 }
1319
1320 FLAC__bool stream_decoder_read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order)
1321 {
1322         FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed;
1323         FLAC__int32 i32;
1324         FLAC__uint32 u32;
1325         unsigned u;
1326
1327         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED;
1328
1329         subframe->residual = decoder->private_->residual[channel];
1330         subframe->order = order;
1331
1332         /* read warm-up samples */
1333         for(u = 0; u < order; u++) {
1334                 if(!FLAC__bitbuffer_read_raw_int32(&decoder->private_->input, &i32, bps, read_callback_, decoder))
1335                         return false; /* the read_callback_ sets the state for us */
1336                 subframe->warmup[u] = i32;
1337         }
1338
1339         /* read entropy coding method info */
1340         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder))
1341                 return false; /* the read_callback_ sets the state for us */
1342         subframe->entropy_coding_method.type = u32;
1343         switch(subframe->entropy_coding_method.type) {
1344                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1345                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder))
1346                                 return false; /* the read_callback_ sets the state for us */
1347                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
1348                         break;
1349                 default:
1350                         decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1351                         return false;
1352         }
1353
1354         /* read residual */
1355         switch(subframe->entropy_coding_method.type) {
1356                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1357                         if(!stream_decoder_read_residual_partitioned_rice_(decoder, order, &subframe->entropy_coding_method.data.partitioned_rice, decoder->private_->residual[channel]))
1358                                 return false;
1359                         break;
1360                 default:
1361                         FLAC__ASSERT(0);
1362         }
1363
1364         /* decode the subframe */
1365         memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
1366         FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order);
1367
1368         return true;
1369 }
1370
1371 FLAC__bool stream_decoder_read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order)
1372 {
1373         FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc;
1374         FLAC__int32 i32;
1375         FLAC__uint32 u32;
1376         unsigned u;
1377
1378         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC;
1379
1380         subframe->residual = decoder->private_->residual[channel];
1381         subframe->order = order;
1382
1383         /* read warm-up samples */
1384         for(u = 0; u < order; u++) {
1385                 if(!FLAC__bitbuffer_read_raw_int32(&decoder->private_->input, &i32, bps, read_callback_, decoder))
1386                         return false; /* the read_callback_ sets the state for us */
1387                 subframe->warmup[u] = i32;
1388         }
1389
1390         /* read qlp coeff precision */
1391         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN, read_callback_, decoder))
1392                 return false; /* the read_callback_ sets the state for us */
1393         if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) {
1394                 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_LOST_SYNC, decoder->private_->client_data);
1395                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1396                 return true;
1397         }
1398         subframe->qlp_coeff_precision = u32+1;
1399
1400         /* read qlp shift */
1401         if(!FLAC__bitbuffer_read_raw_int32(&decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN, read_callback_, decoder))
1402                 return false; /* the read_callback_ sets the state for us */
1403         subframe->quantization_level = i32;
1404
1405         /* read quantized lp coefficiencts */
1406         for(u = 0; u < order; u++) {
1407                 if(!FLAC__bitbuffer_read_raw_int32(&decoder->private_->input, &i32, subframe->qlp_coeff_precision, read_callback_, decoder))
1408                         return false; /* the read_callback_ sets the state for us */
1409                 subframe->qlp_coeff[u] = i32;
1410         }
1411
1412         /* read entropy coding method info */
1413         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder))
1414                 return false; /* the read_callback_ sets the state for us */
1415         subframe->entropy_coding_method.type = u32;
1416         switch(subframe->entropy_coding_method.type) {
1417                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1418                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder))
1419                                 return false; /* the read_callback_ sets the state for us */
1420                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
1421                         break;
1422                 default:
1423                         decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1424                         return false;
1425         }
1426
1427         /* read residual */
1428         switch(subframe->entropy_coding_method.type) {
1429                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1430                         if(!stream_decoder_read_residual_partitioned_rice_(decoder, order, &subframe->entropy_coding_method.data.partitioned_rice, decoder->private_->residual[channel]))
1431                                 return false;
1432                         break;
1433                 default:
1434                         FLAC__ASSERT(0);
1435         }
1436
1437         /* decode the subframe */
1438         memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
1439         if(bps <= 16 && subframe->qlp_coeff_precision <= 16)
1440                 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);
1441         else
1442                 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);
1443
1444         return true;
1445 }
1446
1447 FLAC__bool stream_decoder_read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps)
1448 {
1449         FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim;
1450         FLAC__int32 x, *residual = decoder->private_->residual[channel];
1451         unsigned i;
1452
1453         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM;
1454
1455         subframe->data = residual;
1456
1457         for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
1458                 if(!FLAC__bitbuffer_read_raw_int32(&decoder->private_->input, &x, bps, read_callback_, decoder))
1459                         return false; /* the read_callback_ sets the state for us */
1460                 residual[i] = x;
1461         }
1462
1463         /* decode the subframe */
1464         memcpy(decoder->private_->output[channel], subframe->data, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
1465
1466         return true;
1467 }
1468
1469 FLAC__bool stream_decoder_read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, FLAC__EntropyCodingMethod_PartitionedRice *partitioned_rice, FLAC__int32 *residual)
1470 {
1471         FLAC__uint32 rice_parameter;
1472         int i;
1473         unsigned partition, sample, u;
1474         const unsigned partition_order = partitioned_rice->order;
1475         const unsigned partitions = 1u << partition_order;
1476         const unsigned partition_samples = partition_order > 0? decoder->private_->frame.header.blocksize >> partition_order : decoder->private_->frame.header.blocksize - predictor_order;
1477
1478         sample = 0;
1479         for(partition = 0; partition < partitions; partition++) {
1480                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN, read_callback_, decoder))
1481                         return false; /* the read_callback_ sets the state for us */
1482                 partitioned_rice->parameters[partition] = rice_parameter;
1483                 if(rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1484                         for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
1485 #ifdef FLAC__SYMMETRIC_RICE
1486                                 if(!FLAC__bitbuffer_read_symmetric_rice_signed(&decoder->private_->input, &i, rice_parameter, read_callback_, decoder))
1487                                         return false; /* the read_callback_ sets the state for us */
1488 #else
1489                                 if(!FLAC__bitbuffer_read_rice_signed(&decoder->private_->input, &i, rice_parameter, read_callback_, decoder))
1490                                         return false; /* the read_callback_ sets the state for us */
1491 #endif
1492                                 residual[sample] = i;
1493                         }
1494                 }
1495                 else {
1496                         if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN, read_callback_, decoder))
1497                                 return false; /* the read_callback_ sets the state for us */
1498                         partitioned_rice->raw_bits[partition] = rice_parameter;
1499                         for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
1500                                 if(!FLAC__bitbuffer_read_raw_int32(&decoder->private_->input, &i, rice_parameter, read_callback_, decoder))
1501                                         return false; /* the read_callback_ sets the state for us */
1502                                 residual[sample] = i;
1503                         }
1504                 }
1505         }
1506
1507         return true;
1508 }
1509
1510 FLAC__bool stream_decoder_read_zero_padding_(FLAC__StreamDecoder *decoder)
1511 {
1512         if(decoder->private_->input.consumed_bits != 0) {
1513                 FLAC__uint32 zero = 0;
1514                 if(!FLAC__bitbuffer_read_raw_uint32(&decoder->private_->input, &zero, 8-decoder->private_->input.consumed_bits, read_callback_, decoder))
1515                         return false; /* the read_callback_ sets the state for us */
1516                 if(zero != 0) {
1517                         decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_LOST_SYNC, decoder->private_->client_data);
1518                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1519                 }
1520         }
1521         return true;
1522 }
1523
1524 FLAC__bool read_callback_(FLAC__byte buffer[], unsigned *bytes, void *client_data)
1525 {
1526         FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data;
1527         FLAC__StreamDecoderReadStatus status;
1528         status = decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data);
1529         if(status == FLAC__STREAM_DECODER_READ_END_OF_STREAM)
1530                 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1531         else if(status == FLAC__STREAM_DECODER_READ_ABORT)
1532                 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
1533         return status == FLAC__STREAM_DECODER_READ_CONTINUE;
1534 }