1/* libFLAC - Free Lossless Audio Codec library 2 * Copyright (C) 2000,2001,2002,2003,2004,2005,2006,2007 Josh Coalson 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * - Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 11 * - Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * - Neither the name of the Xiph.org Foundation nor the names of its 16 * contributors may be used to endorse or promote products derived from 17 * this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR 23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#if HAVE_CONFIG_H 33# include <config.h> 34#endif 35 36#if defined _MSC_VER || defined __MINGW32__ 37#include <io.h> /* for _setmode() */ 38#include <fcntl.h> /* for _O_BINARY */ 39#endif 40#if defined __CYGWIN__ || defined __EMX__ 41#include <io.h> /* for setmode(), O_BINARY */ 42#include <fcntl.h> /* for _O_BINARY */ 43#endif 44#include <stdio.h> 45#include <stdlib.h> /* for malloc() */ 46#include <string.h> /* for memset/memcpy() */ 47#include <sys/stat.h> /* for stat() */ 48#include <sys/types.h> /* for off_t */ 49#if defined _MSC_VER || defined __BORLANDC__ || defined __MINGW32__ 50#if _MSC_VER <= 1600 || defined __BORLANDC__ /* @@@ [2G limit] */ 51#define fseeko fseek 52#define ftello ftell 53#endif 54#endif 55#include "FLAC/assert.h" 56#include "share/alloc.h" 57#include "protected/stream_decoder.h" 58#include "private/bitreader.h" 59#include "private/bitmath.h" 60#include "private/cpu.h" 61#include "private/crc.h" 62#include "private/fixed.h" 63#include "private/format.h" 64#include "private/lpc.h" 65#include "private/md5.h" 66#include "private/memory.h" 67 68#ifdef max 69#undef max 70#endif 71#define max(a,b) ((a)>(b)?(a):(b)) 72 73/* adjust for compilers that can't understand using LLU suffix for uint64_t literals */ 74#ifdef _MSC_VER 75#define FLAC__U64L(x) x 76#else 77#define FLAC__U64L(x) x##LLU 78#endif 79 80 81/* technically this should be in an "export.c" but this is convenient enough */ 82FLAC_API int FLAC_API_SUPPORTS_OGG_FLAC = 83#if FLAC__HAS_OGG 84 1 85#else 86 0 87#endif 88; 89 90 91/*********************************************************************** 92 * 93 * Private static data 94 * 95 ***********************************************************************/ 96 97static FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' }; 98 99/*********************************************************************** 100 * 101 * Private class method prototypes 102 * 103 ***********************************************************************/ 104 105static void set_defaults_(FLAC__StreamDecoder *decoder); 106static FILE *get_binary_stdin_(void); 107static FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels); 108static FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id); 109static FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder); 110static FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder); 111static FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length); 112static FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length); 113static FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj); 114static FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj); 115static FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj); 116static FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder); 117static FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder); 118static FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode); 119static FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder); 120static FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode); 121static FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode); 122static FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode); 123static FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode); 124static FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode); 125static FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, unsigned partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual, FLAC__bool is_extended); 126static FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder); 127static FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data); 128#if FLAC__HAS_OGG 129static FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes); 130static FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data); 131#endif 132static FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[]); 133static void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status); 134static FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample); 135#if FLAC__HAS_OGG 136static FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample); 137#endif 138static FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data); 139static FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data); 140static FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data); 141static FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data); 142static FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data); 143 144/*********************************************************************** 145 * 146 * Private class data 147 * 148 ***********************************************************************/ 149 150typedef struct FLAC__StreamDecoderPrivate { 151#if FLAC__HAS_OGG 152 FLAC__bool is_ogg; 153#endif 154 FLAC__StreamDecoderReadCallback read_callback; 155 FLAC__StreamDecoderSeekCallback seek_callback; 156 FLAC__StreamDecoderTellCallback tell_callback; 157 FLAC__StreamDecoderLengthCallback length_callback; 158 FLAC__StreamDecoderEofCallback eof_callback; 159 FLAC__StreamDecoderWriteCallback write_callback; 160 FLAC__StreamDecoderMetadataCallback metadata_callback; 161 FLAC__StreamDecoderErrorCallback error_callback; 162 /* generic 32-bit datapath: */ 163 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[]); 164 /* generic 64-bit datapath: */ 165 void (*local_lpc_restore_signal_64bit)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]); 166 /* for use when the signal is <= 16 bits-per-sample, or <= 15 bits-per-sample on a side channel (which requires 1 extra bit): */ 167 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[]); 168 /* for use when the signal is <= 16 bits-per-sample, or <= 15 bits-per-sample on a side channel (which requires 1 extra bit), AND order <= 8: */ 169 void (*local_lpc_restore_signal_16bit_order8)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]); 170 FLAC__bool (*local_bitreader_read_rice_signed_block)(FLAC__BitReader *br, int vals[], unsigned nvals, unsigned parameter); 171 void *client_data; 172 FILE *file; /* only used if FLAC__stream_decoder_init_file()/FLAC__stream_decoder_init_file() called, else NULL */ 173 FLAC__BitReader *input; 174 FLAC__int32 *output[FLAC__MAX_CHANNELS]; 175 FLAC__int32 *residual[FLAC__MAX_CHANNELS]; /* WATCHOUT: these are the aligned pointers; the real pointers that should be free()'d are residual_unaligned[] below */ 176 FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents[FLAC__MAX_CHANNELS]; 177 unsigned output_capacity, output_channels; 178 FLAC__uint32 fixed_block_size, next_fixed_block_size; 179 FLAC__uint64 samples_decoded; 180 FLAC__bool has_stream_info, has_seek_table; 181 FLAC__StreamMetadata stream_info; 182 FLAC__StreamMetadata seek_table; 183 FLAC__bool metadata_filter[128]; /* MAGIC number 128 == total number of metadata block types == 1 << 7 */ 184 FLAC__byte *metadata_filter_ids; 185 size_t metadata_filter_ids_count, metadata_filter_ids_capacity; /* units for both are IDs, not bytes */ 186 FLAC__Frame frame; 187 FLAC__bool cached; /* true if there is a byte in lookahead */ 188 FLAC__CPUInfo cpuinfo; 189 FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */ 190 FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */ 191 /* unaligned (original) pointers to allocated data */ 192 FLAC__int32 *residual_unaligned[FLAC__MAX_CHANNELS]; 193 FLAC__bool do_md5_checking; /* initially gets protected_->md5_checking but is turned off after a seek or if the metadata has a zero MD5 */ 194 FLAC__bool internal_reset_hack; /* used only during init() so we can call reset to set up the decoder without rewinding the input */ 195 FLAC__bool is_seeking; 196 FLAC__MD5Context md5context; 197 FLAC__byte computed_md5sum[16]; /* this is the sum we computed from the decoded data */ 198 /* (the rest of these are only used for seeking) */ 199 FLAC__Frame last_frame; /* holds the info of the last frame we seeked to */ 200 FLAC__uint64 first_frame_offset; /* hint to the seek routine of where in the stream the first audio frame starts */ 201 FLAC__uint64 target_sample; 202 unsigned unparseable_frame_count; /* used to tell whether we're decoding a future version of FLAC or just got a bad sync */ 203#if FLAC__HAS_OGG 204 FLAC__bool got_a_frame; /* hack needed in Ogg FLAC seek routine to check when process_single() actually writes a frame */ 205#endif 206} FLAC__StreamDecoderPrivate; 207 208/*********************************************************************** 209 * 210 * Public static class data 211 * 212 ***********************************************************************/ 213 214FLAC_API const char * const FLAC__StreamDecoderStateString[] = { 215 "FLAC__STREAM_DECODER_SEARCH_FOR_METADATA", 216 "FLAC__STREAM_DECODER_READ_METADATA", 217 "FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC", 218 "FLAC__STREAM_DECODER_READ_FRAME", 219 "FLAC__STREAM_DECODER_END_OF_STREAM", 220 "FLAC__STREAM_DECODER_OGG_ERROR", 221 "FLAC__STREAM_DECODER_SEEK_ERROR", 222 "FLAC__STREAM_DECODER_ABORTED", 223 "FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR", 224 "FLAC__STREAM_DECODER_UNINITIALIZED" 225}; 226 227FLAC_API const char * const FLAC__StreamDecoderInitStatusString[] = { 228 "FLAC__STREAM_DECODER_INIT_STATUS_OK", 229 "FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER", 230 "FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS", 231 "FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR", 232 "FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE", 233 "FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED" 234}; 235 236FLAC_API const char * const FLAC__StreamDecoderReadStatusString[] = { 237 "FLAC__STREAM_DECODER_READ_STATUS_CONTINUE", 238 "FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM", 239 "FLAC__STREAM_DECODER_READ_STATUS_ABORT" 240}; 241 242FLAC_API const char * const FLAC__StreamDecoderSeekStatusString[] = { 243 "FLAC__STREAM_DECODER_SEEK_STATUS_OK", 244 "FLAC__STREAM_DECODER_SEEK_STATUS_ERROR", 245 "FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED" 246}; 247 248FLAC_API const char * const FLAC__StreamDecoderTellStatusString[] = { 249 "FLAC__STREAM_DECODER_TELL_STATUS_OK", 250 "FLAC__STREAM_DECODER_TELL_STATUS_ERROR", 251 "FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED" 252}; 253 254FLAC_API const char * const FLAC__StreamDecoderLengthStatusString[] = { 255 "FLAC__STREAM_DECODER_LENGTH_STATUS_OK", 256 "FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR", 257 "FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED" 258}; 259 260FLAC_API const char * const FLAC__StreamDecoderWriteStatusString[] = { 261 "FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE", 262 "FLAC__STREAM_DECODER_WRITE_STATUS_ABORT" 263}; 264 265FLAC_API const char * const FLAC__StreamDecoderErrorStatusString[] = { 266 "FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC", 267 "FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER", 268 "FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH", 269 "FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM" 270}; 271 272/*********************************************************************** 273 * 274 * Class constructor/destructor 275 * 276 ***********************************************************************/ 277FLAC_API FLAC__StreamDecoder *FLAC__stream_decoder_new(void) 278{ 279 FLAC__StreamDecoder *decoder; 280 unsigned i; 281 282 FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */ 283 284 decoder = (FLAC__StreamDecoder*)calloc(1, sizeof(FLAC__StreamDecoder)); 285 if(decoder == 0) { 286 return 0; 287 } 288 289 decoder->protected_ = (FLAC__StreamDecoderProtected*)calloc(1, sizeof(FLAC__StreamDecoderProtected)); 290 if(decoder->protected_ == 0) { 291 free(decoder); 292 return 0; 293 } 294 295 decoder->private_ = (FLAC__StreamDecoderPrivate*)calloc(1, sizeof(FLAC__StreamDecoderPrivate)); 296 if(decoder->private_ == 0) { 297 free(decoder->protected_); 298 free(decoder); 299 return 0; 300 } 301 302 decoder->private_->input = FLAC__bitreader_new(); 303 if(decoder->private_->input == 0) { 304 free(decoder->private_); 305 free(decoder->protected_); 306 free(decoder); 307 return 0; 308 } 309 310 decoder->private_->metadata_filter_ids_capacity = 16; 311 if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)malloc((FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) * decoder->private_->metadata_filter_ids_capacity))) { 312 FLAC__bitreader_delete(decoder->private_->input); 313 free(decoder->private_); 314 free(decoder->protected_); 315 free(decoder); 316 return 0; 317 } 318 319 for(i = 0; i < FLAC__MAX_CHANNELS; i++) { 320 decoder->private_->output[i] = 0; 321 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0; 322 } 323 324 decoder->private_->output_capacity = 0; 325 decoder->private_->output_channels = 0; 326 decoder->private_->has_seek_table = false; 327 328 for(i = 0; i < FLAC__MAX_CHANNELS; i++) 329 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&decoder->private_->partitioned_rice_contents[i]); 330 331 decoder->private_->file = 0; 332 333 set_defaults_(decoder); 334 335 decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED; 336 337 return decoder; 338} 339 340FLAC_API void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder) 341{ 342 unsigned i; 343 344 FLAC__ASSERT(0 != decoder); 345 FLAC__ASSERT(0 != decoder->protected_); 346 FLAC__ASSERT(0 != decoder->private_); 347 FLAC__ASSERT(0 != decoder->private_->input); 348 349 (void)FLAC__stream_decoder_finish(decoder); 350 351 if(0 != decoder->private_->metadata_filter_ids) 352 free(decoder->private_->metadata_filter_ids); 353 354 FLAC__bitreader_delete(decoder->private_->input); 355 356 for(i = 0; i < FLAC__MAX_CHANNELS; i++) 357 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&decoder->private_->partitioned_rice_contents[i]); 358 359 free(decoder->private_); 360 free(decoder->protected_); 361 free(decoder); 362} 363 364/*********************************************************************** 365 * 366 * Public class methods 367 * 368 ***********************************************************************/ 369 370static FLAC__StreamDecoderInitStatus init_stream_internal_( 371 FLAC__StreamDecoder *decoder, 372 FLAC__StreamDecoderReadCallback read_callback, 373 FLAC__StreamDecoderSeekCallback seek_callback, 374 FLAC__StreamDecoderTellCallback tell_callback, 375 FLAC__StreamDecoderLengthCallback length_callback, 376 FLAC__StreamDecoderEofCallback eof_callback, 377 FLAC__StreamDecoderWriteCallback write_callback, 378 FLAC__StreamDecoderMetadataCallback metadata_callback, 379 FLAC__StreamDecoderErrorCallback error_callback, 380 void *client_data, 381 FLAC__bool is_ogg 382) 383{ 384 FLAC__ASSERT(0 != decoder); 385 386 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 387 return FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED; 388 389#if !FLAC__HAS_OGG 390 if(is_ogg) 391 return FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER; 392#endif 393 394 if( 395 0 == read_callback || 396 0 == write_callback || 397 0 == error_callback || 398 (seek_callback && (0 == tell_callback || 0 == length_callback || 0 == eof_callback)) 399 ) 400 return FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS; 401 402#if FLAC__HAS_OGG 403 decoder->private_->is_ogg = is_ogg; 404 if(is_ogg && !FLAC__ogg_decoder_aspect_init(&decoder->protected_->ogg_decoder_aspect)) 405 return decoder->protected_->state = FLAC__STREAM_DECODER_OGG_ERROR; 406#endif 407 408 /* 409 * get the CPU info and set the function pointers 410 */ 411 FLAC__cpu_info(&decoder->private_->cpuinfo); 412 /* first default to the non-asm routines */ 413 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal; 414 decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide; 415 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal; 416 decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal; 417 decoder->private_->local_bitreader_read_rice_signed_block = FLAC__bitreader_read_rice_signed_block; 418 /* now override with asm where appropriate */ 419#ifndef FLAC__NO_ASM 420 if(decoder->private_->cpuinfo.use_asm) { 421#ifdef FLAC__CPU_IA32 422 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32); 423#ifdef FLAC__HAS_NASM 424#if 1 /*@@@@@@ OPT: not clearly faster, needs more testing */ 425 if(decoder->private_->cpuinfo.data.ia32.bswap) 426 decoder->private_->local_bitreader_read_rice_signed_block = FLAC__bitreader_read_rice_signed_block_asm_ia32_bswap; 427#endif 428 if(decoder->private_->cpuinfo.data.ia32.mmx) { 429 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32; 430 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32_mmx; 431 decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal_asm_ia32_mmx; 432 } 433 else { 434 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32; 435 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32; 436 decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal_asm_ia32; 437 } 438#endif 439#elif defined FLAC__CPU_PPC 440 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_PPC); 441 if(decoder->private_->cpuinfo.data.ppc.altivec) { 442 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ppc_altivec_16; 443 decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal_asm_ppc_altivec_16_order8; 444 } 445#endif 446 } 447#endif 448 449 /* from here on, errors are fatal */ 450 451 if(!FLAC__bitreader_init(decoder->private_->input, decoder->private_->cpuinfo, read_callback_, decoder)) { 452 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 453 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR; 454 } 455 456 decoder->private_->read_callback = read_callback; 457 decoder->private_->seek_callback = seek_callback; 458 decoder->private_->tell_callback = tell_callback; 459 decoder->private_->length_callback = length_callback; 460 decoder->private_->eof_callback = eof_callback; 461 decoder->private_->write_callback = write_callback; 462 decoder->private_->metadata_callback = metadata_callback; 463 decoder->private_->error_callback = error_callback; 464 decoder->private_->client_data = client_data; 465 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0; 466 decoder->private_->samples_decoded = 0; 467 decoder->private_->has_stream_info = false; 468 decoder->private_->cached = false; 469 470 decoder->private_->do_md5_checking = decoder->protected_->md5_checking; 471 decoder->private_->is_seeking = false; 472 473 decoder->private_->internal_reset_hack = true; /* so the following reset does not try to rewind the input */ 474 if(!FLAC__stream_decoder_reset(decoder)) { 475 /* above call sets the state for us */ 476 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR; 477 } 478 479 return FLAC__STREAM_DECODER_INIT_STATUS_OK; 480} 481 482FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_stream( 483 FLAC__StreamDecoder *decoder, 484 FLAC__StreamDecoderReadCallback read_callback, 485 FLAC__StreamDecoderSeekCallback seek_callback, 486 FLAC__StreamDecoderTellCallback tell_callback, 487 FLAC__StreamDecoderLengthCallback length_callback, 488 FLAC__StreamDecoderEofCallback eof_callback, 489 FLAC__StreamDecoderWriteCallback write_callback, 490 FLAC__StreamDecoderMetadataCallback metadata_callback, 491 FLAC__StreamDecoderErrorCallback error_callback, 492 void *client_data 493) 494{ 495 return init_stream_internal_( 496 decoder, 497 read_callback, 498 seek_callback, 499 tell_callback, 500 length_callback, 501 eof_callback, 502 write_callback, 503 metadata_callback, 504 error_callback, 505 client_data, 506 /*is_ogg=*/false 507 ); 508} 509 510FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_stream( 511 FLAC__StreamDecoder *decoder, 512 FLAC__StreamDecoderReadCallback read_callback, 513 FLAC__StreamDecoderSeekCallback seek_callback, 514 FLAC__StreamDecoderTellCallback tell_callback, 515 FLAC__StreamDecoderLengthCallback length_callback, 516 FLAC__StreamDecoderEofCallback eof_callback, 517 FLAC__StreamDecoderWriteCallback write_callback, 518 FLAC__StreamDecoderMetadataCallback metadata_callback, 519 FLAC__StreamDecoderErrorCallback error_callback, 520 void *client_data 521) 522{ 523 return init_stream_internal_( 524 decoder, 525 read_callback, 526 seek_callback, 527 tell_callback, 528 length_callback, 529 eof_callback, 530 write_callback, 531 metadata_callback, 532 error_callback, 533 client_data, 534 /*is_ogg=*/true 535 ); 536} 537 538static FLAC__StreamDecoderInitStatus init_FILE_internal_( 539 FLAC__StreamDecoder *decoder, 540 FILE *file, 541 FLAC__StreamDecoderWriteCallback write_callback, 542 FLAC__StreamDecoderMetadataCallback metadata_callback, 543 FLAC__StreamDecoderErrorCallback error_callback, 544 void *client_data, 545 FLAC__bool is_ogg 546) 547{ 548 FLAC__ASSERT(0 != decoder); 549 FLAC__ASSERT(0 != file); 550 551 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 552 return decoder->protected_->state = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED; 553 554 if(0 == write_callback || 0 == error_callback) 555 return decoder->protected_->state = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS; 556 557 /* 558 * To make sure that our file does not go unclosed after an error, we 559 * must assign the FILE pointer before any further error can occur in 560 * this routine. 561 */ 562 if(file == stdin) 563 file = get_binary_stdin_(); /* just to be safe */ 564 565 decoder->private_->file = file; 566 567 return init_stream_internal_( 568 decoder, 569 file_read_callback_, 570 decoder->private_->file == stdin? 0: file_seek_callback_, 571 decoder->private_->file == stdin? 0: file_tell_callback_, 572 decoder->private_->file == stdin? 0: file_length_callback_, 573 file_eof_callback_, 574 write_callback, 575 metadata_callback, 576 error_callback, 577 client_data, 578 is_ogg 579 ); 580} 581 582FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_FILE( 583 FLAC__StreamDecoder *decoder, 584 FILE *file, 585 FLAC__StreamDecoderWriteCallback write_callback, 586 FLAC__StreamDecoderMetadataCallback metadata_callback, 587 FLAC__StreamDecoderErrorCallback error_callback, 588 void *client_data 589) 590{ 591 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false); 592} 593 594FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_FILE( 595 FLAC__StreamDecoder *decoder, 596 FILE *file, 597 FLAC__StreamDecoderWriteCallback write_callback, 598 FLAC__StreamDecoderMetadataCallback metadata_callback, 599 FLAC__StreamDecoderErrorCallback error_callback, 600 void *client_data 601) 602{ 603 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true); 604} 605 606static FLAC__StreamDecoderInitStatus init_file_internal_( 607 FLAC__StreamDecoder *decoder, 608 const char *filename, 609 FLAC__StreamDecoderWriteCallback write_callback, 610 FLAC__StreamDecoderMetadataCallback metadata_callback, 611 FLAC__StreamDecoderErrorCallback error_callback, 612 void *client_data, 613 FLAC__bool is_ogg 614) 615{ 616 FILE *file; 617 618 FLAC__ASSERT(0 != decoder); 619 620 /* 621 * To make sure that our file does not go unclosed after an error, we 622 * have to do the same entrance checks here that are later performed 623 * in FLAC__stream_decoder_init_FILE() before the FILE* is assigned. 624 */ 625 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 626 return decoder->protected_->state = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED; 627 628 if(0 == write_callback || 0 == error_callback) 629 return decoder->protected_->state = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS; 630 631 file = filename? fopen(filename, "rb") : stdin; 632 633 if(0 == file) 634 return FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE; 635 636 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, is_ogg); 637} 638 639FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_file( 640 FLAC__StreamDecoder *decoder, 641 const char *filename, 642 FLAC__StreamDecoderWriteCallback write_callback, 643 FLAC__StreamDecoderMetadataCallback metadata_callback, 644 FLAC__StreamDecoderErrorCallback error_callback, 645 void *client_data 646) 647{ 648 return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false); 649} 650 651FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_file( 652 FLAC__StreamDecoder *decoder, 653 const char *filename, 654 FLAC__StreamDecoderWriteCallback write_callback, 655 FLAC__StreamDecoderMetadataCallback metadata_callback, 656 FLAC__StreamDecoderErrorCallback error_callback, 657 void *client_data 658) 659{ 660 return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true); 661} 662 663FLAC_API FLAC__bool FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder) 664{ 665 FLAC__bool md5_failed = false; 666 unsigned i; 667 668 FLAC__ASSERT(0 != decoder); 669 FLAC__ASSERT(0 != decoder->private_); 670 FLAC__ASSERT(0 != decoder->protected_); 671 672 if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED) 673 return true; 674 675 /* see the comment in FLAC__seekable_stream_decoder_reset() as to why we 676 * always call FLAC__MD5Final() 677 */ 678 FLAC__MD5Final(decoder->private_->computed_md5sum, &decoder->private_->md5context); 679 680 if(decoder->private_->has_seek_table && 0 != decoder->private_->seek_table.data.seek_table.points) { 681 free(decoder->private_->seek_table.data.seek_table.points); 682 decoder->private_->seek_table.data.seek_table.points = 0; 683 decoder->private_->has_seek_table = false; 684 } 685 FLAC__bitreader_free(decoder->private_->input); 686 for(i = 0; i < FLAC__MAX_CHANNELS; i++) { 687 /* WATCHOUT: 688 * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the 689 * output arrays have a buffer of up to 3 zeroes in front 690 * (at negative indices) for alignment purposes; we use 4 691 * to keep the data well-aligned. 692 */ 693 if(0 != decoder->private_->output[i]) { 694 free(decoder->private_->output[i]-4); 695 decoder->private_->output[i] = 0; 696 } 697 if(0 != decoder->private_->residual_unaligned[i]) { 698 free(decoder->private_->residual_unaligned[i]); 699 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0; 700 } 701 } 702 decoder->private_->output_capacity = 0; 703 decoder->private_->output_channels = 0; 704 705#if FLAC__HAS_OGG 706 if(decoder->private_->is_ogg) 707 FLAC__ogg_decoder_aspect_finish(&decoder->protected_->ogg_decoder_aspect); 708#endif 709 710 if(0 != decoder->private_->file) { 711 if(decoder->private_->file != stdin) 712 fclose(decoder->private_->file); 713 decoder->private_->file = 0; 714 } 715 716 if(decoder->private_->do_md5_checking) { 717 if(memcmp(decoder->private_->stream_info.data.stream_info.md5sum, decoder->private_->computed_md5sum, 16)) 718 md5_failed = true; 719 } 720 decoder->private_->is_seeking = false; 721 722 set_defaults_(decoder); 723 724 decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED; 725 726 return !md5_failed; 727} 728 729FLAC_API FLAC__bool FLAC__stream_decoder_set_ogg_serial_number(FLAC__StreamDecoder *decoder, long value) 730{ 731 FLAC__ASSERT(0 != decoder); 732 FLAC__ASSERT(0 != decoder->private_); 733 FLAC__ASSERT(0 != decoder->protected_); 734 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 735 return false; 736#if FLAC__HAS_OGG 737 /* can't check decoder->private_->is_ogg since that's not set until init time */ 738 FLAC__ogg_decoder_aspect_set_serial_number(&decoder->protected_->ogg_decoder_aspect, value); 739 return true; 740#else 741 (void)value; 742 return false; 743#endif 744} 745 746FLAC_API FLAC__bool FLAC__stream_decoder_set_md5_checking(FLAC__StreamDecoder *decoder, FLAC__bool value) 747{ 748 FLAC__ASSERT(0 != decoder); 749 FLAC__ASSERT(0 != decoder->protected_); 750 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 751 return false; 752 decoder->protected_->md5_checking = value; 753 return true; 754} 755 756FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type) 757{ 758 FLAC__ASSERT(0 != decoder); 759 FLAC__ASSERT(0 != decoder->private_); 760 FLAC__ASSERT(0 != decoder->protected_); 761 FLAC__ASSERT((unsigned)type <= FLAC__MAX_METADATA_TYPE_CODE); 762 /* double protection */ 763 if((unsigned)type > FLAC__MAX_METADATA_TYPE_CODE) 764 return false; 765 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 766 return false; 767 decoder->private_->metadata_filter[type] = true; 768 if(type == FLAC__METADATA_TYPE_APPLICATION) 769 decoder->private_->metadata_filter_ids_count = 0; 770 return true; 771} 772 773FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4]) 774{ 775 FLAC__ASSERT(0 != decoder); 776 FLAC__ASSERT(0 != decoder->private_); 777 FLAC__ASSERT(0 != decoder->protected_); 778 FLAC__ASSERT(0 != id); 779 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 780 return false; 781 782 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION]) 783 return true; 784 785 FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids); 786 787 if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) { 788 if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) { 789 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 790 return false; 791 } 792 decoder->private_->metadata_filter_ids_capacity *= 2; 793 } 794 795 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)); 796 decoder->private_->metadata_filter_ids_count++; 797 798 return true; 799} 800 801FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder) 802{ 803 unsigned i; 804 FLAC__ASSERT(0 != decoder); 805 FLAC__ASSERT(0 != decoder->private_); 806 FLAC__ASSERT(0 != decoder->protected_); 807 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 808 return false; 809 for(i = 0; i < sizeof(decoder->private_->metadata_filter) / sizeof(decoder->private_->metadata_filter[0]); i++) 810 decoder->private_->metadata_filter[i] = true; 811 decoder->private_->metadata_filter_ids_count = 0; 812 return true; 813} 814 815FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type) 816{ 817 FLAC__ASSERT(0 != decoder); 818 FLAC__ASSERT(0 != decoder->private_); 819 FLAC__ASSERT(0 != decoder->protected_); 820 FLAC__ASSERT((unsigned)type <= FLAC__MAX_METADATA_TYPE_CODE); 821 /* double protection */ 822 if((unsigned)type > FLAC__MAX_METADATA_TYPE_CODE) 823 return false; 824 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 825 return false; 826 decoder->private_->metadata_filter[type] = false; 827 if(type == FLAC__METADATA_TYPE_APPLICATION) 828 decoder->private_->metadata_filter_ids_count = 0; 829 return true; 830} 831 832FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4]) 833{ 834 FLAC__ASSERT(0 != decoder); 835 FLAC__ASSERT(0 != decoder->private_); 836 FLAC__ASSERT(0 != decoder->protected_); 837 FLAC__ASSERT(0 != id); 838 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 839 return false; 840 841 if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION]) 842 return true; 843 844 FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids); 845 846 if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) { 847 if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) { 848 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 849 return false; 850 } 851 decoder->private_->metadata_filter_ids_capacity *= 2; 852 } 853 854 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)); 855 decoder->private_->metadata_filter_ids_count++; 856 857 return true; 858} 859 860FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder) 861{ 862 FLAC__ASSERT(0 != decoder); 863 FLAC__ASSERT(0 != decoder->private_); 864 FLAC__ASSERT(0 != decoder->protected_); 865 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 866 return false; 867 memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter)); 868 decoder->private_->metadata_filter_ids_count = 0; 869 return true; 870} 871 872FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder) 873{ 874 FLAC__ASSERT(0 != decoder); 875 FLAC__ASSERT(0 != decoder->protected_); 876 return decoder->protected_->state; 877} 878 879FLAC_API const char *FLAC__stream_decoder_get_resolved_state_string(const FLAC__StreamDecoder *decoder) 880{ 881 return FLAC__StreamDecoderStateString[decoder->protected_->state]; 882} 883 884FLAC_API FLAC__bool FLAC__stream_decoder_get_md5_checking(const FLAC__StreamDecoder *decoder) 885{ 886 FLAC__ASSERT(0 != decoder); 887 FLAC__ASSERT(0 != decoder->protected_); 888 return decoder->protected_->md5_checking; 889} 890 891FLAC_API FLAC__uint64 FLAC__stream_decoder_get_total_samples(const FLAC__StreamDecoder *decoder) 892{ 893 FLAC__ASSERT(0 != decoder); 894 FLAC__ASSERT(0 != decoder->protected_); 895 return decoder->private_->has_stream_info? decoder->private_->stream_info.data.stream_info.total_samples : 0; 896} 897 898FLAC_API unsigned FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder) 899{ 900 FLAC__ASSERT(0 != decoder); 901 FLAC__ASSERT(0 != decoder->protected_); 902 return decoder->protected_->channels; 903} 904 905FLAC_API FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder) 906{ 907 FLAC__ASSERT(0 != decoder); 908 FLAC__ASSERT(0 != decoder->protected_); 909 return decoder->protected_->channel_assignment; 910} 911 912FLAC_API unsigned FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder) 913{ 914 FLAC__ASSERT(0 != decoder); 915 FLAC__ASSERT(0 != decoder->protected_); 916 return decoder->protected_->bits_per_sample; 917} 918 919FLAC_API unsigned FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder) 920{ 921 FLAC__ASSERT(0 != decoder); 922 FLAC__ASSERT(0 != decoder->protected_); 923 return decoder->protected_->sample_rate; 924} 925 926FLAC_API unsigned FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder) 927{ 928 FLAC__ASSERT(0 != decoder); 929 FLAC__ASSERT(0 != decoder->protected_); 930 return decoder->protected_->blocksize; 931} 932 933FLAC_API FLAC__bool FLAC__stream_decoder_get_decode_position(const FLAC__StreamDecoder *decoder, FLAC__uint64 *position) 934{ 935 FLAC__ASSERT(0 != decoder); 936 FLAC__ASSERT(0 != decoder->private_); 937 FLAC__ASSERT(0 != position); 938 939#if FLAC__HAS_OGG 940 if(decoder->private_->is_ogg) 941 return false; 942#endif 943 if(0 == decoder->private_->tell_callback) 944 return false; 945 if(decoder->private_->tell_callback(decoder, position, decoder->private_->client_data) != FLAC__STREAM_DECODER_TELL_STATUS_OK) 946 return false; 947 /* should never happen since all FLAC frames and metadata blocks are byte aligned, but check just in case */ 948 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) 949 return false; 950 FLAC__ASSERT(*position >= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder)); 951 *position -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder); 952 return true; 953} 954 955FLAC_API FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder) 956{ 957 FLAC__ASSERT(0 != decoder); 958 FLAC__ASSERT(0 != decoder->private_); 959 FLAC__ASSERT(0 != decoder->protected_); 960 961 decoder->private_->samples_decoded = 0; 962 decoder->private_->do_md5_checking = false; 963 964#if FLAC__HAS_OGG 965 if(decoder->private_->is_ogg) 966 FLAC__ogg_decoder_aspect_flush(&decoder->protected_->ogg_decoder_aspect); 967#endif 968 969 if(!FLAC__bitreader_clear(decoder->private_->input)) { 970 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 971 return false; 972 } 973 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 974 975 return true; 976} 977 978FLAC_API FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder) 979{ 980 FLAC__ASSERT(0 != decoder); 981 FLAC__ASSERT(0 != decoder->private_); 982 FLAC__ASSERT(0 != decoder->protected_); 983 984 if(!FLAC__stream_decoder_flush(decoder)) { 985 /* above call sets the state for us */ 986 return false; 987 } 988 989#if FLAC__HAS_OGG 990 /*@@@ could go in !internal_reset_hack block below */ 991 if(decoder->private_->is_ogg) 992 FLAC__ogg_decoder_aspect_reset(&decoder->protected_->ogg_decoder_aspect); 993#endif 994 995 /* Rewind if necessary. If FLAC__stream_decoder_init() is calling us, 996 * (internal_reset_hack) don't try to rewind since we are already at 997 * the beginning of the stream and don't want to fail if the input is 998 * not seekable. 999 */ 1000 if(!decoder->private_->internal_reset_hack) { 1001 if(decoder->private_->file == stdin) 1002 return false; /* can't rewind stdin, reset fails */ 1003 if(decoder->private_->seek_callback && decoder->private_->seek_callback(decoder, 0, decoder->private_->client_data) == FLAC__STREAM_DECODER_SEEK_STATUS_ERROR) 1004 return false; /* seekable and seek fails, reset fails */ 1005 } 1006 else 1007 decoder->private_->internal_reset_hack = false; 1008 1009 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA; 1010 1011 decoder->private_->has_stream_info = false; 1012 if(decoder->private_->has_seek_table && 0 != decoder->private_->seek_table.data.seek_table.points) { 1013 free(decoder->private_->seek_table.data.seek_table.points); 1014 decoder->private_->seek_table.data.seek_table.points = 0; 1015 decoder->private_->has_seek_table = false; 1016 } 1017 decoder->private_->do_md5_checking = decoder->protected_->md5_checking; 1018 /* 1019 * This goes in reset() and not flush() because according to the spec, a 1020 * fixed-blocksize stream must stay that way through the whole stream. 1021 */ 1022 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0; 1023 1024 /* We initialize the FLAC__MD5Context even though we may never use it. This 1025 * is because md5 checking may be turned on to start and then turned off if 1026 * a seek occurs. So we init the context here and finalize it in 1027 * FLAC__stream_decoder_finish() to make sure things are always cleaned up 1028 * properly. 1029 */ 1030 FLAC__MD5Init(&decoder->private_->md5context); 1031 1032 decoder->private_->first_frame_offset = 0; 1033 decoder->private_->unparseable_frame_count = 0; 1034 1035 return true; 1036} 1037 1038FLAC_API FLAC__bool FLAC__stream_decoder_process_single(FLAC__StreamDecoder *decoder) 1039{ 1040 FLAC__bool got_a_frame; 1041 FLAC__ASSERT(0 != decoder); 1042 FLAC__ASSERT(0 != decoder->protected_); 1043 1044 while(1) { 1045 switch(decoder->protected_->state) { 1046 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA: 1047 if(!find_metadata_(decoder)) 1048 return false; /* above function sets the status for us */ 1049 break; 1050 case FLAC__STREAM_DECODER_READ_METADATA: 1051 if(!read_metadata_(decoder)) 1052 return false; /* above function sets the status for us */ 1053 else 1054 return true; 1055 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC: 1056 if(!frame_sync_(decoder)) 1057 return true; /* above function sets the status for us */ 1058 break; 1059 case FLAC__STREAM_DECODER_READ_FRAME: 1060 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/true)) 1061 return false; /* above function sets the status for us */ 1062 if(got_a_frame) 1063 return true; /* above function sets the status for us */ 1064 break; 1065 case FLAC__STREAM_DECODER_END_OF_STREAM: 1066 case FLAC__STREAM_DECODER_ABORTED: 1067 return true; 1068 default: 1069 FLAC__ASSERT(0); 1070 return false; 1071 } 1072 } 1073} 1074 1075FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder *decoder) 1076{ 1077 FLAC__ASSERT(0 != decoder); 1078 FLAC__ASSERT(0 != decoder->protected_); 1079 1080 while(1) { 1081 switch(decoder->protected_->state) { 1082 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA: 1083 if(!find_metadata_(decoder)) 1084 return false; /* above function sets the status for us */ 1085 break; 1086 case FLAC__STREAM_DECODER_READ_METADATA: 1087 if(!read_metadata_(decoder)) 1088 return false; /* above function sets the status for us */ 1089 break; 1090 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC: 1091 case FLAC__STREAM_DECODER_READ_FRAME: 1092 case FLAC__STREAM_DECODER_END_OF_STREAM: 1093 case FLAC__STREAM_DECODER_ABORTED: 1094 return true; 1095 default: 1096 FLAC__ASSERT(0); 1097 return false; 1098 } 1099 } 1100} 1101 1102FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder *decoder) 1103{ 1104 FLAC__bool dummy; 1105 FLAC__ASSERT(0 != decoder); 1106 FLAC__ASSERT(0 != decoder->protected_); 1107 1108 while(1) { 1109 switch(decoder->protected_->state) { 1110 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA: 1111 if(!find_metadata_(decoder)) 1112 return false; /* above function sets the status for us */ 1113 break; 1114 case FLAC__STREAM_DECODER_READ_METADATA: 1115 if(!read_metadata_(decoder)) 1116 return false; /* above function sets the status for us */ 1117 break; 1118 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC: 1119 if(!frame_sync_(decoder)) 1120 return true; /* above function sets the status for us */ 1121 break; 1122 case FLAC__STREAM_DECODER_READ_FRAME: 1123 if(!read_frame_(decoder, &dummy, /*do_full_decode=*/true)) 1124 return false; /* above function sets the status for us */ 1125 break; 1126 case FLAC__STREAM_DECODER_END_OF_STREAM: 1127 case FLAC__STREAM_DECODER_ABORTED: 1128 return true; 1129 default: 1130 FLAC__ASSERT(0); 1131 return false; 1132 } 1133 } 1134} 1135 1136FLAC_API FLAC__bool FLAC__stream_decoder_skip_single_frame(FLAC__StreamDecoder *decoder) 1137{ 1138 FLAC__bool got_a_frame; 1139 FLAC__ASSERT(0 != decoder); 1140 FLAC__ASSERT(0 != decoder->protected_); 1141 1142 while(1) { 1143 switch(decoder->protected_->state) { 1144 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA: 1145 case FLAC__STREAM_DECODER_READ_METADATA: 1146 return false; /* above function sets the status for us */ 1147 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC: 1148 if(!frame_sync_(decoder)) 1149 return true; /* above function sets the status for us */ 1150 break; 1151 case FLAC__STREAM_DECODER_READ_FRAME: 1152 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/false)) 1153 return false; /* above function sets the status for us */ 1154 if(got_a_frame) 1155 return true; /* above function sets the status for us */ 1156 break; 1157 case FLAC__STREAM_DECODER_END_OF_STREAM: 1158 case FLAC__STREAM_DECODER_ABORTED: 1159 return true; 1160 default: 1161 FLAC__ASSERT(0); 1162 return false; 1163 } 1164 } 1165} 1166 1167FLAC_API FLAC__bool FLAC__stream_decoder_seek_absolute(FLAC__StreamDecoder *decoder, FLAC__uint64 sample) 1168{ 1169 FLAC__uint64 length; 1170 1171 FLAC__ASSERT(0 != decoder); 1172 1173 if( 1174 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA && 1175 decoder->protected_->state != FLAC__STREAM_DECODER_READ_METADATA && 1176 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC && 1177 decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME && 1178 decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM 1179 ) 1180 return false; 1181 1182 if(0 == decoder->private_->seek_callback) 1183 return false; 1184 1185 FLAC__ASSERT(decoder->private_->seek_callback); 1186 FLAC__ASSERT(decoder->private_->tell_callback); 1187 FLAC__ASSERT(decoder->private_->length_callback); 1188 FLAC__ASSERT(decoder->private_->eof_callback); 1189 1190 if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder)) 1191 return false; 1192 1193 decoder->private_->is_seeking = true; 1194 1195 /* turn off md5 checking if a seek is attempted */ 1196 decoder->private_->do_md5_checking = false; 1197 1198 /* get the file length (currently our algorithm needs to know the length so it's also an error to get FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED) */ 1199 if(decoder->private_->length_callback(decoder, &length, decoder->private_->client_data) != FLAC__STREAM_DECODER_LENGTH_STATUS_OK) { 1200 decoder->private_->is_seeking = false; 1201 return false; 1202 } 1203 1204 /* if we haven't finished processing the metadata yet, do that so we have the STREAMINFO, SEEK_TABLE, and first_frame_offset */ 1205 if( 1206 decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA || 1207 decoder->protected_->state == FLAC__STREAM_DECODER_READ_METADATA 1208 ) { 1209 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder)) { 1210 /* above call sets the state for us */ 1211 decoder->private_->is_seeking = false; 1212 return false; 1213 } 1214 /* check this again in case we didn't know total_samples the first time */ 1215 if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder)) { 1216 decoder->private_->is_seeking = false; 1217 return false; 1218 } 1219 } 1220 1221 { 1222 const FLAC__bool ok = 1223#if FLAC__HAS_OGG 1224 decoder->private_->is_ogg? 1225 seek_to_absolute_sample_ogg_(decoder, length, sample) : 1226#endif 1227 seek_to_absolute_sample_(decoder, length, sample) 1228 ; 1229 decoder->private_->is_seeking = false; 1230 return ok; 1231 } 1232} 1233 1234/*********************************************************************** 1235 * 1236 * Protected class methods 1237 * 1238 ***********************************************************************/ 1239 1240unsigned FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder) 1241{ 1242 FLAC__ASSERT(0 != decoder); 1243 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1244 FLAC__ASSERT(!(FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) & 7)); 1245 return FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) / 8; 1246} 1247 1248/*********************************************************************** 1249 * 1250 * Private class methods 1251 * 1252 ***********************************************************************/ 1253 1254void set_defaults_(FLAC__StreamDecoder *decoder) 1255{ 1256#if FLAC__HAS_OGG 1257 decoder->private_->is_ogg = false; 1258#endif 1259 decoder->private_->read_callback = 0; 1260 decoder->private_->seek_callback = 0; 1261 decoder->private_->tell_callback = 0; 1262 decoder->private_->length_callback = 0; 1263 decoder->private_->eof_callback = 0; 1264 decoder->private_->write_callback = 0; 1265 decoder->private_->metadata_callback = 0; 1266 decoder->private_->error_callback = 0; 1267 decoder->private_->client_data = 0; 1268 1269 memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter)); 1270 decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] = true; 1271 decoder->private_->metadata_filter_ids_count = 0; 1272 1273 decoder->protected_->md5_checking = false; 1274 1275#if FLAC__HAS_OGG 1276 FLAC__ogg_decoder_aspect_set_defaults(&decoder->protected_->ogg_decoder_aspect); 1277#endif 1278} 1279 1280/* 1281 * This will forcibly set stdin to binary mode (for OSes that require it) 1282 */ 1283FILE *get_binary_stdin_(void) 1284{ 1285 /* if something breaks here it is probably due to the presence or 1286 * absence of an underscore before the identifiers 'setmode', 1287 * 'fileno', and/or 'O_BINARY'; check your system header files. 1288 */ 1289#if defined _MSC_VER || defined __MINGW32__ 1290 _setmode(_fileno(stdin), _O_BINARY); 1291#elif defined __CYGWIN__ 1292 /* almost certainly not needed for any modern Cygwin, but let's be safe... */ 1293 setmode(_fileno(stdin), _O_BINARY); 1294#elif defined __EMX__ 1295 setmode(fileno(stdin), O_BINARY); 1296#endif 1297 1298 return stdin; 1299} 1300 1301FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels) 1302{ 1303 unsigned i; 1304 FLAC__int32 *tmp; 1305 1306 if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels) 1307 return true; 1308 1309 /* simply using realloc() is not practical because the number of channels may change mid-stream */ 1310 1311 for(i = 0; i < FLAC__MAX_CHANNELS; i++) { 1312 if(0 != decoder->private_->output[i]) { 1313 free(decoder->private_->output[i]-4); 1314 decoder->private_->output[i] = 0; 1315 } 1316 if(0 != decoder->private_->residual_unaligned[i]) { 1317 free(decoder->private_->residual_unaligned[i]); 1318 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0; 1319 } 1320 } 1321 1322 for(i = 0; i < channels; i++) { 1323 /* WATCHOUT: 1324 * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the 1325 * output arrays have a buffer of up to 3 zeroes in front 1326 * (at negative indices) for alignment purposes; we use 4 1327 * to keep the data well-aligned. 1328 */ 1329 tmp = (FLAC__int32*)safe_malloc_muladd2_(sizeof(FLAC__int32), /*times (*/size, /*+*/4/*)*/); 1330 if(tmp == 0) { 1331 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1332 return false; 1333 } 1334 memset(tmp, 0, sizeof(FLAC__int32)*4); 1335 decoder->private_->output[i] = tmp + 4; 1336 1337 /* WATCHOUT: 1338 * minimum of quadword alignment for PPC vector optimizations is REQUIRED: 1339 */ 1340 if(!FLAC__memory_alloc_aligned_int32_array(size, &decoder->private_->residual_unaligned[i], &decoder->private_->residual[i])) { 1341 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1342 return false; 1343 } 1344 } 1345 1346 decoder->private_->output_capacity = size; 1347 decoder->private_->output_channels = channels; 1348 1349 return true; 1350} 1351 1352FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id) 1353{ 1354 size_t i; 1355 1356 FLAC__ASSERT(0 != decoder); 1357 FLAC__ASSERT(0 != decoder->private_); 1358 1359 for(i = 0; i < decoder->private_->metadata_filter_ids_count; i++) 1360 if(0 == memcmp(decoder->private_->metadata_filter_ids + i * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8))) 1361 return true; 1362 1363 return false; 1364} 1365 1366FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder) 1367{ 1368 FLAC__uint32 x; 1369 unsigned i, id; 1370 FLAC__bool first = true; 1371 1372 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1373 1374 for(i = id = 0; i < 4; ) { 1375 if(decoder->private_->cached) { 1376 x = (FLAC__uint32)decoder->private_->lookahead; 1377 decoder->private_->cached = false; 1378 } 1379 else { 1380 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 1381 return false; /* read_callback_ sets the state for us */ 1382 } 1383 if(x == FLAC__STREAM_SYNC_STRING[i]) { 1384 first = true; 1385 i++; 1386 id = 0; 1387 continue; 1388 } 1389 if(x == ID3V2_TAG_[id]) { 1390 id++; 1391 i = 0; 1392 if(id == 3) { 1393 if(!skip_id3v2_tag_(decoder)) 1394 return false; /* skip_id3v2_tag_ sets the state for us */ 1395 } 1396 continue; 1397 } 1398 id = 0; 1399 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */ 1400 decoder->private_->header_warmup[0] = (FLAC__byte)x; 1401 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 1402 return false; /* read_callback_ sets the state for us */ 1403 1404 /* 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 */ 1405 /* else we have to check if the second byte is the end of a sync code */ 1406 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */ 1407 decoder->private_->lookahead = (FLAC__byte)x; 1408 decoder->private_->cached = true; 1409 } 1410 else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */ 1411 decoder->private_->header_warmup[1] = (FLAC__byte)x; 1412 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME; 1413 return true; 1414 } 1415 } 1416 i = 0; 1417 if(first) { 1418 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 1419 first = false; 1420 } 1421 } 1422 1423 decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA; 1424 return true; 1425} 1426 1427FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder) 1428{ 1429 FLAC__bool is_last; 1430 FLAC__uint32 i, x, type, length; 1431 1432 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1433 1434 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_IS_LAST_LEN)) 1435 return false; /* read_callback_ sets the state for us */ 1436 is_last = x? true : false; 1437 1438 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN)) 1439 return false; /* read_callback_ sets the state for us */ 1440 1441 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN)) 1442 return false; /* read_callback_ sets the state for us */ 1443 1444 if(type == FLAC__METADATA_TYPE_STREAMINFO) { 1445 if(!read_metadata_streaminfo_(decoder, is_last, length)) 1446 return false; 1447 1448 decoder->private_->has_stream_info = true; 1449 if(0 == memcmp(decoder->private_->stream_info.data.stream_info.md5sum, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 16)) 1450 decoder->private_->do_md5_checking = false; 1451 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] && decoder->private_->metadata_callback) 1452 decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data); 1453 } 1454 else if(type == FLAC__METADATA_TYPE_SEEKTABLE) { 1455 if(!read_metadata_seektable_(decoder, is_last, length)) 1456 return false; 1457 1458 decoder->private_->has_seek_table = true; 1459 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_SEEKTABLE] && decoder->private_->metadata_callback) 1460 decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data); 1461 } 1462 else { 1463 FLAC__bool skip_it = !decoder->private_->metadata_filter[type]; 1464 unsigned real_length = length; 1465 FLAC__StreamMetadata block; 1466 1467 block.is_last = is_last; 1468 block.type = (FLAC__MetadataType)type; 1469 block.length = length; 1470 1471 if(type == FLAC__METADATA_TYPE_APPLICATION) { 1472 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)) 1473 return false; /* read_callback_ sets the state for us */ 1474 1475 if(real_length < FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) { /* underflow check */ 1476 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;/*@@@@@@ maybe wrong error? need to resync?*/ 1477 return false; 1478 } 1479 1480 real_length -= FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8; 1481 1482 if(decoder->private_->metadata_filter_ids_count > 0 && has_id_filtered_(decoder, block.data.application.id)) 1483 skip_it = !skip_it; 1484 } 1485 1486 if(skip_it) { 1487 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length)) 1488 return false; /* read_callback_ sets the state for us */ 1489 } 1490 else { 1491 switch(type) { 1492 case FLAC__METADATA_TYPE_PADDING: 1493 /* skip the padding bytes */ 1494 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length)) 1495 return false; /* read_callback_ sets the state for us */ 1496 break; 1497 case FLAC__METADATA_TYPE_APPLICATION: 1498 /* remember, we read the ID already */ 1499 if(real_length > 0) { 1500 if(0 == (block.data.application.data = (FLAC__byte*)malloc(real_length))) { 1501 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1502 return false; 1503 } 1504 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.data, real_length)) 1505 return false; /* read_callback_ sets the state for us */ 1506 } 1507 else 1508 block.data.application.data = 0; 1509 break; 1510 case FLAC__METADATA_TYPE_VORBIS_COMMENT: 1511 if(!read_metadata_vorbiscomment_(decoder, &block.data.vorbis_comment)) 1512 return false; 1513 break; 1514 case FLAC__METADATA_TYPE_CUESHEET: 1515 if(!read_metadata_cuesheet_(decoder, &block.data.cue_sheet)) 1516 return false; 1517 break; 1518 case FLAC__METADATA_TYPE_PICTURE: 1519 if(!read_metadata_picture_(decoder, &block.data.picture)) 1520 return false; 1521 break; 1522 case FLAC__METADATA_TYPE_STREAMINFO: 1523 case FLAC__METADATA_TYPE_SEEKTABLE: 1524 FLAC__ASSERT(0); 1525 break; 1526 default: 1527 if(real_length > 0) { 1528 if(0 == (block.data.unknown.data = (FLAC__byte*)malloc(real_length))) { 1529 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1530 return false; 1531 } 1532 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.unknown.data, real_length)) 1533 return false; /* read_callback_ sets the state for us */ 1534 } 1535 else 1536 block.data.unknown.data = 0; 1537 break; 1538 } 1539 if(!decoder->private_->is_seeking && decoder->private_->metadata_callback) 1540 decoder->private_->metadata_callback(decoder, &block, decoder->private_->client_data); 1541 1542 /* now we have to free any malloc()ed data in the block */ 1543 switch(type) { 1544 case FLAC__METADATA_TYPE_PADDING: 1545 break; 1546 case FLAC__METADATA_TYPE_APPLICATION: 1547 if(0 != block.data.application.data) 1548 free(block.data.application.data); 1549 break; 1550 case FLAC__METADATA_TYPE_VORBIS_COMMENT: 1551 if(0 != block.data.vorbis_comment.vendor_string.entry) 1552 free(block.data.vorbis_comment.vendor_string.entry); 1553 if(block.data.vorbis_comment.num_comments > 0) 1554 for(i = 0; i < block.data.vorbis_comment.num_comments; i++) 1555 if(0 != block.data.vorbis_comment.comments[i].entry) 1556 free(block.data.vorbis_comment.comments[i].entry); 1557 if(0 != block.data.vorbis_comment.comments) 1558 free(block.data.vorbis_comment.comments); 1559 break; 1560 case FLAC__METADATA_TYPE_CUESHEET: 1561 if(block.data.cue_sheet.num_tracks > 0) 1562 for(i = 0; i < block.data.cue_sheet.num_tracks; i++) 1563 if(0 != block.data.cue_sheet.tracks[i].indices) 1564 free(block.data.cue_sheet.tracks[i].indices); 1565 if(0 != block.data.cue_sheet.tracks) 1566 free(block.data.cue_sheet.tracks); 1567 break; 1568 case FLAC__METADATA_TYPE_PICTURE: 1569 if(0 != block.data.picture.mime_type) 1570 free(block.data.picture.mime_type); 1571 if(0 != block.data.picture.description) 1572 free(block.data.picture.description); 1573 if(0 != block.data.picture.data) 1574 free(block.data.picture.data); 1575 break; 1576 case FLAC__METADATA_TYPE_STREAMINFO: 1577 case FLAC__METADATA_TYPE_SEEKTABLE: 1578 FLAC__ASSERT(0); 1579 default: 1580 if(0 != block.data.unknown.data) 1581 free(block.data.unknown.data); 1582 break; 1583 } 1584 } 1585 } 1586 1587 if(is_last) { 1588 /* if this fails, it's OK, it's just a hint for the seek routine */ 1589 if(!FLAC__stream_decoder_get_decode_position(decoder, &decoder->private_->first_frame_offset)) 1590 decoder->private_->first_frame_offset = 0; 1591 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 1592 } 1593 1594 return true; 1595} 1596 1597FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length) 1598{ 1599 FLAC__uint32 x; 1600 unsigned bits, used_bits = 0; 1601 1602 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1603 1604 decoder->private_->stream_info.type = FLAC__METADATA_TYPE_STREAMINFO; 1605 decoder->private_->stream_info.is_last = is_last; 1606 decoder->private_->stream_info.length = length; 1607 1608 bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN; 1609 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, bits)) 1610 return false; /* read_callback_ sets the state for us */ 1611 decoder->private_->stream_info.data.stream_info.min_blocksize = x; 1612 used_bits += bits; 1613 1614 bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN; 1615 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN)) 1616 return false; /* read_callback_ sets the state for us */ 1617 decoder->private_->stream_info.data.stream_info.max_blocksize = x; 1618 used_bits += bits; 1619 1620 bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN; 1621 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN)) 1622 return false; /* read_callback_ sets the state for us */ 1623 decoder->private_->stream_info.data.stream_info.min_framesize = x; 1624 used_bits += bits; 1625 1626 bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN; 1627 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN)) 1628 return false; /* read_callback_ sets the state for us */ 1629 decoder->private_->stream_info.data.stream_info.max_framesize = x; 1630 used_bits += bits; 1631 1632 bits = FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN; 1633 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN)) 1634 return false; /* read_callback_ sets the state for us */ 1635 decoder->private_->stream_info.data.stream_info.sample_rate = x; 1636 used_bits += bits; 1637 1638 bits = FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN; 1639 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN)) 1640 return false; /* read_callback_ sets the state for us */ 1641 decoder->private_->stream_info.data.stream_info.channels = x+1; 1642 used_bits += bits; 1643 1644 bits = FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN; 1645 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN)) 1646 return false; /* read_callback_ sets the state for us */ 1647 decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1; 1648 used_bits += bits; 1649 1650 bits = FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN; 1651 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &decoder->private_->stream_info.data.stream_info.total_samples, FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN)) 1652 return false; /* read_callback_ sets the state for us */ 1653 used_bits += bits; 1654 1655 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, decoder->private_->stream_info.data.stream_info.md5sum, 16)) 1656 return false; /* read_callback_ sets the state for us */ 1657 used_bits += 16*8; 1658 1659 /* skip the rest of the block */ 1660 FLAC__ASSERT(used_bits % 8 == 0); 1661 length -= (used_bits / 8); 1662 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length)) 1663 return false; /* read_callback_ sets the state for us */ 1664 1665 return true; 1666} 1667 1668FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length) 1669{ 1670 FLAC__uint32 i, x; 1671 FLAC__uint64 xx; 1672 1673 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1674 1675 decoder->private_->seek_table.type = FLAC__METADATA_TYPE_SEEKTABLE; 1676 decoder->private_->seek_table.is_last = is_last; 1677 decoder->private_->seek_table.length = length; 1678 1679 decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH; 1680 1681 /* use realloc since we may pass through here several times (e.g. after seeking) */ 1682 if(0 == (decoder->private_->seek_table.data.seek_table.points = (FLAC__StreamMetadata_SeekPoint*)safe_realloc_mul_2op_(decoder->private_->seek_table.data.seek_table.points, decoder->private_->seek_table.data.seek_table.num_points, /*times*/sizeof(FLAC__StreamMetadata_SeekPoint)))) { 1683 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1684 return false; 1685 } 1686 for(i = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) { 1687 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN)) 1688 return false; /* read_callback_ sets the state for us */ 1689 decoder->private_->seek_table.data.seek_table.points[i].sample_number = xx; 1690 1691 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN)) 1692 return false; /* read_callback_ sets the state for us */ 1693 decoder->private_->seek_table.data.seek_table.points[i].stream_offset = xx; 1694 1695 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN)) 1696 return false; /* read_callback_ sets the state for us */ 1697 decoder->private_->seek_table.data.seek_table.points[i].frame_samples = x; 1698 } 1699 length -= (decoder->private_->seek_table.data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH); 1700 /* if there is a partial point left, skip over it */ 1701 if(length > 0) { 1702 /*@@@ do a send_error_to_client_() here? there's an argument for either way */ 1703 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length)) 1704 return false; /* read_callback_ sets the state for us */ 1705 } 1706 1707 return true; 1708} 1709 1710FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj) 1711{ 1712 FLAC__uint32 i; 1713 1714 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1715 1716 /* read vendor string */ 1717 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32); 1718 if(!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->vendor_string.length)) 1719 return false; /* read_callback_ sets the state for us */ 1720 if(obj->vendor_string.length > 0) { 1721 if(0 == (obj->vendor_string.entry = (FLAC__byte*)safe_malloc_add_2op_(obj->vendor_string.length, /*+*/1))) { 1722 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1723 return false; 1724 } 1725 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->vendor_string.entry, obj->vendor_string.length)) 1726 return false; /* read_callback_ sets the state for us */ 1727 obj->vendor_string.entry[obj->vendor_string.length] = '\0'; 1728 } 1729 else 1730 obj->vendor_string.entry = 0; 1731 1732 /* read num comments */ 1733 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN == 32); 1734 if(!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->num_comments)) 1735 return false; /* read_callback_ sets the state for us */ 1736 1737 /* read comments */ 1738 if(obj->num_comments > 0) { 1739 if(0 == (obj->comments = (FLAC__StreamMetadata_VorbisComment_Entry*)safe_malloc_mul_2op_(obj->num_comments, /*times*/sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) { 1740 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1741 return false; 1742 } 1743 for(i = 0; i < obj->num_comments; i++) { 1744 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32); 1745 if(!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->comments[i].length)) 1746 return false; /* read_callback_ sets the state for us */ 1747 if(obj->comments[i].length > 0) { 1748 if(0 == (obj->comments[i].entry = (FLAC__byte*)safe_malloc_add_2op_(obj->comments[i].length, /*+*/1))) { 1749 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1750 return false; 1751 } 1752 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->comments[i].entry, obj->comments[i].length)) 1753 return false; /* read_callback_ sets the state for us */ 1754 obj->comments[i].entry[obj->comments[i].length] = '\0'; 1755 } 1756 else 1757 obj->comments[i].entry = 0; 1758 } 1759 } 1760 else { 1761 obj->comments = 0; 1762 } 1763 1764 return true; 1765} 1766 1767FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj) 1768{ 1769 FLAC__uint32 i, j, x; 1770 1771 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1772 1773 memset(obj, 0, sizeof(FLAC__StreamMetadata_CueSheet)); 1774 1775 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0); 1776 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->media_catalog_number, FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN/8)) 1777 return false; /* read_callback_ sets the state for us */ 1778 1779 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &obj->lead_in, FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN)) 1780 return false; /* read_callback_ sets the state for us */ 1781 1782 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN)) 1783 return false; /* read_callback_ sets the state for us */ 1784 obj->is_cd = x? true : false; 1785 1786 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN)) 1787 return false; /* read_callback_ sets the state for us */ 1788 1789 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN)) 1790 return false; /* read_callback_ sets the state for us */ 1791 obj->num_tracks = x; 1792 1793 if(obj->num_tracks > 0) { 1794 if(0 == (obj->tracks = (FLAC__StreamMetadata_CueSheet_Track*)safe_calloc_(obj->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track)))) { 1795 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1796 return false; 1797 } 1798 for(i = 0; i < obj->num_tracks; i++) { 1799 FLAC__StreamMetadata_CueSheet_Track *track = &obj->tracks[i]; 1800 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &track->offset, FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN)) 1801 return false; /* read_callback_ sets the state for us */ 1802 1803 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN)) 1804 return false; /* read_callback_ sets the state for us */ 1805 track->number = (FLAC__byte)x; 1806 1807 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0); 1808 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)track->isrc, FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN/8)) 1809 return false; /* read_callback_ sets the state for us */ 1810 1811 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN)) 1812 return false; /* read_callback_ sets the state for us */ 1813 track->type = x; 1814 1815 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN)) 1816 return false; /* read_callback_ sets the state for us */ 1817 track->pre_emphasis = x; 1818 1819 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN)) 1820 return false; /* read_callback_ sets the state for us */ 1821 1822 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN)) 1823 return false; /* read_callback_ sets the state for us */ 1824 track->num_indices = (FLAC__byte)x; 1825 1826 if(track->num_indices > 0) { 1827 if(0 == (track->indices = (FLAC__StreamMetadata_CueSheet_Index*)safe_calloc_(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index)))) { 1828 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1829 return false; 1830 } 1831 for(j = 0; j < track->num_indices; j++) { 1832 FLAC__StreamMetadata_CueSheet_Index *index = &track->indices[j]; 1833 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &index->offset, FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN)) 1834 return false; /* read_callback_ sets the state for us */ 1835 1836 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN)) 1837 return false; /* read_callback_ sets the state for us */ 1838 index->number = (FLAC__byte)x; 1839 1840 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN)) 1841 return false; /* read_callback_ sets the state for us */ 1842 } 1843 } 1844 } 1845 } 1846 1847 return true; 1848} 1849 1850FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj) 1851{ 1852 FLAC__uint32 x; 1853 1854 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1855 1856 /* read type */ 1857 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_TYPE_LEN)) 1858 return false; /* read_callback_ sets the state for us */ 1859 obj->type = x; 1860 1861 /* read MIME type */ 1862 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN)) 1863 return false; /* read_callback_ sets the state for us */ 1864 if(0 == (obj->mime_type = (char*)safe_malloc_add_2op_(x, /*+*/1))) { 1865 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1866 return false; 1867 } 1868 if(x > 0) { 1869 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->mime_type, x)) 1870 return false; /* read_callback_ sets the state for us */ 1871 } 1872 obj->mime_type[x] = '\0'; 1873 1874 /* read description */ 1875 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN)) 1876 return false; /* read_callback_ sets the state for us */ 1877 if(0 == (obj->description = (FLAC__byte*)safe_malloc_add_2op_(x, /*+*/1))) { 1878 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1879 return false; 1880 } 1881 if(x > 0) { 1882 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->description, x)) 1883 return false; /* read_callback_ sets the state for us */ 1884 } 1885 obj->description[x] = '\0'; 1886 1887 /* read width */ 1888 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->width, FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN)) 1889 return false; /* read_callback_ sets the state for us */ 1890 1891 /* read height */ 1892 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->height, FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN)) 1893 return false; /* read_callback_ sets the state for us */ 1894 1895 /* read depth */ 1896 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->depth, FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN)) 1897 return false; /* read_callback_ sets the state for us */ 1898 1899 /* read colors */ 1900 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->colors, FLAC__STREAM_METADATA_PICTURE_COLORS_LEN)) 1901 return false; /* read_callback_ sets the state for us */ 1902 1903 /* read data */ 1904 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &(obj->data_length), FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN)) 1905 return false; /* read_callback_ sets the state for us */ 1906 if(0 == (obj->data = (FLAC__byte*)safe_malloc_(obj->data_length))) { 1907 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1908 return false; 1909 } 1910 if(obj->data_length > 0) { 1911 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->data, obj->data_length)) 1912 return false; /* read_callback_ sets the state for us */ 1913 } 1914 1915 return true; 1916} 1917 1918FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder) 1919{ 1920 FLAC__uint32 x; 1921 unsigned i, skip; 1922 1923 /* skip the version and flags bytes */ 1924 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 24)) 1925 return false; /* read_callback_ sets the state for us */ 1926 /* get the size (in bytes) to skip */ 1927 skip = 0; 1928 for(i = 0; i < 4; i++) { 1929 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 1930 return false; /* read_callback_ sets the state for us */ 1931 skip <<= 7; 1932 skip |= (x & 0x7f); 1933 } 1934 /* skip the rest of the tag */ 1935 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, skip)) 1936 return false; /* read_callback_ sets the state for us */ 1937 return true; 1938} 1939 1940FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder) 1941{ 1942 FLAC__uint32 x; 1943 FLAC__bool first = true; 1944 1945 /* If we know the total number of samples in the stream, stop if we've read that many. */ 1946 /* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */ 1947 if(FLAC__stream_decoder_get_total_samples(decoder) > 0) { 1948 if(decoder->private_->samples_decoded >= FLAC__stream_decoder_get_total_samples(decoder)) { 1949 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM; 1950 return true; 1951 } 1952 } 1953 1954 /* make sure we're byte aligned */ 1955 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) { 1956 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input))) 1957 return false; /* read_callback_ sets the state for us */ 1958 } 1959 1960 while(1) { 1961 if(decoder->private_->cached) { 1962 x = (FLAC__uint32)decoder->private_->lookahead; 1963 decoder->private_->cached = false; 1964 } 1965 else { 1966 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 1967 return false; /* read_callback_ sets the state for us */ 1968 } 1969 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */ 1970 decoder->private_->header_warmup[0] = (FLAC__byte)x; 1971 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 1972 return false; /* read_callback_ sets the state for us */ 1973 1974 /* 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 */ 1975 /* else we have to check if the second byte is the end of a sync code */ 1976 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */ 1977 decoder->private_->lookahead = (FLAC__byte)x; 1978 decoder->private_->cached = true; 1979 } 1980 else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */ 1981 decoder->private_->header_warmup[1] = (FLAC__byte)x; 1982 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME; 1983 return true; 1984 } 1985 } 1986 if(first) { 1987 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 1988 first = false; 1989 } 1990 } 1991 1992 return true; 1993} 1994 1995FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode) 1996{ 1997 unsigned channel; 1998 unsigned i; 1999 FLAC__int32 mid, side; 2000 unsigned frame_crc; /* the one we calculate from the input stream */ 2001 FLAC__uint32 x; 2002 2003 *got_a_frame = false; 2004 2005 /* init the CRC */ 2006 frame_crc = 0; 2007 frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc); 2008 frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc); 2009 FLAC__bitreader_reset_read_crc16(decoder->private_->input, (FLAC__uint16)frame_crc); 2010 2011 if(!read_frame_header_(decoder)) 2012 return false; 2013 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means we didn't sync on a valid header */ 2014 return true; 2015 if(!allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels)) 2016 return false; 2017 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) { 2018 /* 2019 * first figure the correct bits-per-sample of the subframe 2020 */ 2021 unsigned bps = decoder->private_->frame.header.bits_per_sample; 2022 switch(decoder->private_->frame.header.channel_assignment) { 2023 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT: 2024 /* no adjustment needed */ 2025 break; 2026 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE: 2027 FLAC__ASSERT(decoder->private_->frame.header.channels == 2); 2028 if(channel == 1) 2029 bps++; 2030 break; 2031 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE: 2032 FLAC__ASSERT(decoder->private_->frame.header.channels == 2); 2033 if(channel == 0) 2034 bps++; 2035 break; 2036 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE: 2037 FLAC__ASSERT(decoder->private_->frame.header.channels == 2); 2038 if(channel == 1) 2039 bps++; 2040 break; 2041 default: 2042 FLAC__ASSERT(0); 2043 } 2044 /* 2045 * now read it 2046 */ 2047 if(!read_subframe_(decoder, channel, bps, do_full_decode)) 2048 return false; 2049 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */ 2050 return true; 2051 } 2052 if(!read_zero_padding_(decoder)) 2053 return false; 2054 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption (i.e. "zero bits" were not all zeroes) */ 2055 return true; 2056 2057 /* 2058 * Read the frame CRC-16 from the footer and check 2059 */ 2060 frame_crc = FLAC__bitreader_get_read_crc16(decoder->private_->input); 2061 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN)) 2062 return false; /* read_callback_ sets the state for us */ 2063 if(frame_crc == x) { 2064 if(do_full_decode) { 2065 /* Undo any special channel coding */ 2066 switch(decoder->private_->frame.header.channel_assignment) { 2067 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT: 2068 /* do nothing */ 2069 break; 2070 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE: 2071 FLAC__ASSERT(decoder->private_->frame.header.channels == 2); 2072 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) 2073 decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i]; 2074 break; 2075 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE: 2076 FLAC__ASSERT(decoder->private_->frame.header.channels == 2); 2077 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) 2078 decoder->private_->output[0][i] += decoder->private_->output[1][i]; 2079 break; 2080 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE: 2081 FLAC__ASSERT(decoder->private_->frame.header.channels == 2); 2082 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) { 2083#if 1 2084 mid = decoder->private_->output[0][i]; 2085 side = decoder->private_->output[1][i]; 2086 mid <<= 1; 2087 mid |= (side & 1); /* i.e. if 'side' is odd... */ 2088 decoder->private_->output[0][i] = (mid + side) >> 1; 2089 decoder->private_->output[1][i] = (mid - side) >> 1; 2090#else 2091 /* OPT: without 'side' temp variable */ 2092 mid = (decoder->private_->output[0][i] << 1) | (decoder->private_->output[1][i] & 1); /* i.e. if 'side' is odd... */ 2093 decoder->private_->output[0][i] = (mid + decoder->private_->output[1][i]) >> 1; 2094 decoder->private_->output[1][i] = (mid - decoder->private_->output[1][i]) >> 1; 2095#endif 2096 } 2097 break; 2098 default: 2099 FLAC__ASSERT(0); 2100 break; 2101 } 2102 } 2103 } 2104 else { 2105 /* Bad frame, emit error and zero the output signal */ 2106 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH); 2107 if(do_full_decode) { 2108 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) { 2109 memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize); 2110 } 2111 } 2112 } 2113 2114 *got_a_frame = true; 2115 2116 /* we wait to update fixed_block_size until here, when we're sure we've got a proper frame and hence a correct blocksize */ 2117 if(decoder->private_->next_fixed_block_size) 2118 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size; 2119 2120 /* put the latest values into the public section of the decoder instance */ 2121 decoder->protected_->channels = decoder->private_->frame.header.channels; 2122 decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment; 2123 decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample; 2124 decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate; 2125 decoder->protected_->blocksize = decoder->private_->frame.header.blocksize; 2126 2127 FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); 2128 decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize; 2129 2130 /* write it */ 2131 if(do_full_decode) { 2132 if(write_audio_frame_to_client_(decoder, &decoder->private_->frame, (const FLAC__int32 * const *)decoder->private_->output) != FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE) 2133 return false; 2134 } 2135 2136 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2137 return true; 2138} 2139 2140FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder) 2141{ 2142 FLAC__uint32 x; 2143 FLAC__uint64 xx; 2144 unsigned i, blocksize_hint = 0, sample_rate_hint = 0; 2145 FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */ 2146 unsigned raw_header_len; 2147 FLAC__bool is_unparseable = false; 2148 2149 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 2150 2151 /* init the raw header with the saved bits from synchronization */ 2152 raw_header[0] = decoder->private_->header_warmup[0]; 2153 raw_header[1] = decoder->private_->header_warmup[1]; 2154 raw_header_len = 2; 2155 2156 /* check to make sure that reserved bit is 0 */ 2157 if(raw_header[1] & 0x02) /* MAGIC NUMBER */ 2158 is_unparseable = true; 2159 2160 /* 2161 * Note that along the way as we read the header, we look for a sync 2162 * code inside. If we find one it would indicate that our original 2163 * sync was bad since there cannot be a sync code in a valid header. 2164 * 2165 * Three kinds of things can go wrong when reading the frame header: 2166 * 1) We may have sync'ed incorrectly and not landed on a frame header. 2167 * If we don't find a sync code, it can end up looking like we read 2168 * a valid but unparseable header, until getting to the frame header 2169 * CRC. Even then we could get a false positive on the CRC. 2170 * 2) We may have sync'ed correctly but on an unparseable frame (from a 2171 * future encoder). 2172 * 3) We may be on a damaged frame which appears valid but unparseable. 2173 * 2174 * For all these reasons, we try and read a complete frame header as 2175 * long as it seems valid, even if unparseable, up until the frame 2176 * header CRC. 2177 */ 2178 2179 /* 2180 * read in the raw header as bytes so we can CRC it, and parse it on the way 2181 */ 2182 for(i = 0; i < 2; i++) { 2183 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 2184 return false; /* read_callback_ sets the state for us */ 2185 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */ 2186 /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */ 2187 decoder->private_->lookahead = (FLAC__byte)x; 2188 decoder->private_->cached = true; 2189 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER); 2190 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2191 return true; 2192 } 2193 raw_header[raw_header_len++] = (FLAC__byte)x; 2194 } 2195 2196 switch(x = raw_header[2] >> 4) { 2197 case 0: 2198 is_unparseable = true; 2199 break; 2200 case 1: 2201 decoder->private_->frame.header.blocksize = 192; 2202 break; 2203 case 2: 2204 case 3: 2205 case 4: 2206 case 5: 2207 decoder->private_->frame.header.blocksize = 576 << (x-2); 2208 break; 2209 case 6: 2210 case 7: 2211 blocksize_hint = x; 2212 break; 2213 case 8: 2214 case 9: 2215 case 10: 2216 case 11: 2217 case 12: 2218 case 13: 2219 case 14: 2220 case 15: 2221 decoder->private_->frame.header.blocksize = 256 << (x-8); 2222 break; 2223 default: 2224 FLAC__ASSERT(0); 2225 break; 2226 } 2227 2228 switch(x = raw_header[2] & 0x0f) { 2229 case 0: 2230 if(decoder->private_->has_stream_info) 2231 decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate; 2232 else 2233 is_unparseable = true; 2234 break; 2235 case 1: 2236 decoder->private_->frame.header.sample_rate = 88200; 2237 break; 2238 case 2: 2239 decoder->private_->frame.header.sample_rate = 176400; 2240 break; 2241 case 3: 2242 decoder->private_->frame.header.sample_rate = 192000; 2243 break; 2244 case 4: 2245 decoder->private_->frame.header.sample_rate = 8000; 2246 break; 2247 case 5: 2248 decoder->private_->frame.header.sample_rate = 16000; 2249 break; 2250 case 6: 2251 decoder->private_->frame.header.sample_rate = 22050; 2252 break; 2253 case 7: 2254 decoder->private_->frame.header.sample_rate = 24000; 2255 break; 2256 case 8: 2257 decoder->private_->frame.header.sample_rate = 32000; 2258 break; 2259 case 9: 2260 decoder->private_->frame.header.sample_rate = 44100; 2261 break; 2262 case 10: 2263 decoder->private_->frame.header.sample_rate = 48000; 2264 break; 2265 case 11: 2266 decoder->private_->frame.header.sample_rate = 96000; 2267 break; 2268 case 12: 2269 case 13: 2270 case 14: 2271 sample_rate_hint = x; 2272 break; 2273 case 15: 2274 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER); 2275 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2276 return true; 2277 default: 2278 FLAC__ASSERT(0); 2279 } 2280 2281 x = (unsigned)(raw_header[3] >> 4); 2282 if(x & 8) { 2283 decoder->private_->frame.header.channels = 2; 2284 switch(x & 7) { 2285 case 0: 2286 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE; 2287 break; 2288 case 1: 2289 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE; 2290 break; 2291 case 2: 2292 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE; 2293 break; 2294 default: 2295 is_unparseable = true; 2296 break; 2297 } 2298 } 2299 else { 2300 decoder->private_->frame.header.channels = (unsigned)x + 1; 2301 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT; 2302 } 2303 2304 switch(x = (unsigned)(raw_header[3] & 0x0e) >> 1) { 2305 case 0: 2306 if(decoder->private_->has_stream_info) 2307 decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample; 2308 else 2309 is_unparseable = true; 2310 break; 2311 case 1: 2312 decoder->private_->frame.header.bits_per_sample = 8; 2313 break; 2314 case 2: 2315 decoder->private_->frame.header.bits_per_sample = 12; 2316 break; 2317 case 4: 2318 decoder->private_->frame.header.bits_per_sample = 16; 2319 break; 2320 case 5: 2321 decoder->private_->frame.header.bits_per_sample = 20; 2322 break; 2323 case 6: 2324 decoder->private_->frame.header.bits_per_sample = 24; 2325 break; 2326 case 3: 2327 case 7: 2328 is_unparseable = true; 2329 break; 2330 default: 2331 FLAC__ASSERT(0); 2332 break; 2333 } 2334 2335 /* check to make sure that reserved bit is 0 */ 2336 if(raw_header[3] & 0x01) /* MAGIC NUMBER */ 2337 is_unparseable = true; 2338 2339 /* read the frame's starting sample number (or frame number as the case may be) */ 2340 if( 2341 raw_header[1] & 0x01 || 2342 /*@@@ this clause is a concession to the old way of doing variable blocksize; the only known implementation is flake and can probably be removed without inconveniencing anyone */ 2343 (decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.min_blocksize != decoder->private_->stream_info.data.stream_info.max_blocksize) 2344 ) { /* variable blocksize */ 2345 if(!FLAC__bitreader_read_utf8_uint64(decoder->private_->input, &xx, raw_header, &raw_header_len)) 2346 return false; /* read_callback_ sets the state for us */ 2347 if(xx == FLAC__U64L(0xffffffffffffffff)) { /* i.e. non-UTF8 code... */ 2348 decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */ 2349 decoder->private_->cached = true; 2350 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER); 2351 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2352 return true; 2353 } 2354 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER; 2355 decoder->private_->frame.header.number.sample_number = xx; 2356 } 2357 else { /* fixed blocksize */ 2358 if(!FLAC__bitreader_read_utf8_uint32(decoder->private_->input, &x, raw_header, &raw_header_len)) 2359 return false; /* read_callback_ sets the state for us */ 2360 if(x == 0xffffffff) { /* i.e. non-UTF8 code... */ 2361 decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */ 2362 decoder->private_->cached = true; 2363 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER); 2364 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2365 return true; 2366 } 2367 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER; 2368 decoder->private_->frame.header.number.frame_number = x; 2369 } 2370 2371 if(blocksize_hint) { 2372 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 2373 return false; /* read_callback_ sets the state for us */ 2374 raw_header[raw_header_len++] = (FLAC__byte)x; 2375 if(blocksize_hint == 7) { 2376 FLAC__uint32 _x; 2377 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8)) 2378 return false; /* read_callback_ sets the state for us */ 2379 raw_header[raw_header_len++] = (FLAC__byte)_x; 2380 x = (x << 8) | _x; 2381 } 2382 decoder->private_->frame.header.blocksize = x+1; 2383 } 2384 2385 if(sample_rate_hint) { 2386 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 2387 return false; /* read_callback_ sets the state for us */ 2388 raw_header[raw_header_len++] = (FLAC__byte)x; 2389 if(sample_rate_hint != 12) { 2390 FLAC__uint32 _x; 2391 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8)) 2392 return false; /* read_callback_ sets the state for us */ 2393 raw_header[raw_header_len++] = (FLAC__byte)_x; 2394 x = (x << 8) | _x; 2395 } 2396 if(sample_rate_hint == 12) 2397 decoder->private_->frame.header.sample_rate = x*1000; 2398 else if(sample_rate_hint == 13) 2399 decoder->private_->frame.header.sample_rate = x; 2400 else 2401 decoder->private_->frame.header.sample_rate = x*10; 2402 } 2403 2404 /* read the CRC-8 byte */ 2405 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 2406 return false; /* read_callback_ sets the state for us */ 2407 crc8 = (FLAC__byte)x; 2408 2409 if(FLAC__crc8(raw_header, raw_header_len) != crc8) { 2410 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER); 2411 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2412 return true; 2413 } 2414 2415 /* calculate the sample number from the frame number if needed */ 2416 decoder->private_->next_fixed_block_size = 0; 2417 if(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER) { 2418 x = decoder->private_->frame.header.number.frame_number; 2419 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER; 2420 if(decoder->private_->fixed_block_size) 2421 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->fixed_block_size * (FLAC__uint64)x; 2422 else if(decoder->private_->has_stream_info) { 2423 if(decoder->private_->stream_info.data.stream_info.min_blocksize == decoder->private_->stream_info.data.stream_info.max_blocksize) { 2424 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__uint64)x; 2425 decoder->private_->next_fixed_block_size = decoder->private_->stream_info.data.stream_info.max_blocksize; 2426 } 2427 else 2428 is_unparseable = true; 2429 } 2430 else if(x == 0) { 2431 decoder->private_->frame.header.number.sample_number = 0; 2432 decoder->private_->next_fixed_block_size = decoder->private_->frame.header.blocksize; 2433 } 2434 else { 2435 /* can only get here if the stream has invalid frame numbering and no STREAMINFO, so assume it's not the last (possibly short) frame */ 2436 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->frame.header.blocksize * (FLAC__uint64)x; 2437 } 2438 } 2439 2440 if(is_unparseable) { 2441 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM); 2442 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2443 return true; 2444 } 2445 2446 return true; 2447} 2448 2449FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode) 2450{ 2451 FLAC__uint32 x; 2452 FLAC__bool wasted_bits; 2453 unsigned i; 2454 2455 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) /* MAGIC NUMBER */ 2456 return false; /* read_callback_ sets the state for us */ 2457 2458 wasted_bits = (x & 1); 2459 x &= 0xfe; 2460 2461 if(wasted_bits) { 2462 unsigned u; 2463 if(!FLAC__bitreader_read_unary_unsigned(decoder->private_->input, &u)) 2464 return false; /* read_callback_ sets the state for us */ 2465 decoder->private_->frame.subframes[channel].wasted_bits = u+1; 2466 bps -= decoder->private_->frame.subframes[channel].wasted_bits; 2467 } 2468 else 2469 decoder->private_->frame.subframes[channel].wasted_bits = 0; 2470 2471 /* 2472 * Lots of magic numbers here 2473 */ 2474 if(x & 0x80) { 2475 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 2476 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2477 return true; 2478 } 2479 else if(x == 0) { 2480 if(!read_subframe_constant_(decoder, channel, bps, do_full_decode)) 2481 return false; 2482 } 2483 else if(x == 2) { 2484 if(!read_subframe_verbatim_(decoder, channel, bps, do_full_decode)) 2485 return false; 2486 } 2487 else if(x < 16) { 2488 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM); 2489 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2490 return true; 2491 } 2492 else if(x <= 24) { 2493 if(!read_subframe_fixed_(decoder, channel, bps, (x>>1)&7, do_full_decode)) 2494 return false; 2495 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */ 2496 return true; 2497 } 2498 else if(x < 64) { 2499 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM); 2500 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2501 return true; 2502 } 2503 else { 2504 if(!read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1, do_full_decode)) 2505 return false; 2506 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */ 2507 return true; 2508 } 2509 2510 if(wasted_bits && do_full_decode) { 2511 x = decoder->private_->frame.subframes[channel].wasted_bits; 2512 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) 2513 decoder->private_->output[channel][i] <<= x; 2514 } 2515 2516 return true; 2517} 2518 2519FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode) 2520{ 2521 FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant; 2522 FLAC__int32 x; 2523 unsigned i; 2524 FLAC__int32 *output = decoder->private_->output[channel]; 2525 2526 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT; 2527 2528 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps)) 2529 return false; /* read_callback_ sets the state for us */ 2530 2531 subframe->value = x; 2532 2533 /* decode the subframe */ 2534 if(do_full_decode) { 2535 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) 2536 output[i] = x; 2537 } 2538 2539 return true; 2540} 2541 2542FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode) 2543{ 2544 FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed; 2545 FLAC__int32 i32; 2546 FLAC__uint32 u32; 2547 unsigned u; 2548 2549 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED; 2550 2551 subframe->residual = decoder->private_->residual[channel]; 2552 subframe->order = order; 2553 2554 /* read warm-up samples */ 2555 for(u = 0; u < order; u++) { 2556 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps)) 2557 return false; /* read_callback_ sets the state for us */ 2558 subframe->warmup[u] = i32; 2559 } 2560 2561 /* read entropy coding method info */ 2562 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN)) 2563 return false; /* read_callback_ sets the state for us */ 2564 subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32; 2565 switch(subframe->entropy_coding_method.type) { 2566 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE: 2567 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2: 2568 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN)) 2569 return false; /* read_callback_ sets the state for us */ 2570 subframe->entropy_coding_method.data.partitioned_rice.order = u32; 2571 subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel]; 2572 break; 2573 default: 2574 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM); 2575 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2576 return true; 2577 } 2578 2579 /* read residual */ 2580 switch(subframe->entropy_coding_method.type) { 2581 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE: 2582 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2: 2583 if(!read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, &decoder->private_->partitioned_rice_contents[channel], decoder->private_->residual[channel], /*is_extended=*/subframe->entropy_coding_method.type == FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2)) 2584 return false; 2585 break; 2586 default: 2587 FLAC__ASSERT(0); 2588 } 2589 2590 /* decode the subframe */ 2591 if(do_full_decode) { 2592 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order); 2593 FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order); 2594 } 2595 2596 return true; 2597} 2598 2599FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode) 2600{ 2601 FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc; 2602 FLAC__int32 i32; 2603 FLAC__uint32 u32; 2604 unsigned u; 2605 2606 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC; 2607 2608 subframe->residual = decoder->private_->residual[channel]; 2609 subframe->order = order; 2610 2611 /* read warm-up samples */ 2612 for(u = 0; u < order; u++) { 2613 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps)) 2614 return false; /* read_callback_ sets the state for us */ 2615 subframe->warmup[u] = i32; 2616 } 2617 2618 /* read qlp coeff precision */ 2619 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN)) 2620 return false; /* read_callback_ sets the state for us */ 2621 if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) { 2622 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 2623 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2624 return true; 2625 } 2626 subframe->qlp_coeff_precision = u32+1; 2627 2628 /* read qlp shift */ 2629 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN)) 2630 return false; /* read_callback_ sets the state for us */ 2631 subframe->quantization_level = i32; 2632 2633 /* read quantized lp coefficiencts */ 2634 for(u = 0; u < order; u++) { 2635 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision)) 2636 return false; /* read_callback_ sets the state for us */ 2637 subframe->qlp_coeff[u] = i32; 2638 } 2639 2640 /* read entropy coding method info */ 2641 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN)) 2642 return false; /* read_callback_ sets the state for us */ 2643 subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32; 2644 switch(subframe->entropy_coding_method.type) { 2645 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE: 2646 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2: 2647 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN)) 2648 return false; /* read_callback_ sets the state for us */ 2649 subframe->entropy_coding_method.data.partitioned_rice.order = u32; 2650 subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel]; 2651 break; 2652 default: 2653 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM); 2654 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2655 return true; 2656 } 2657 2658 /* read residual */ 2659 switch(subframe->entropy_coding_method.type) { 2660 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE: 2661 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2: 2662 if(!read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, &decoder->private_->partitioned_rice_contents[channel], decoder->private_->residual[channel], /*is_extended=*/subframe->entropy_coding_method.type == FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2)) 2663 return false; 2664 break; 2665 default: 2666 FLAC__ASSERT(0); 2667 } 2668 2669 /* decode the subframe */ 2670 if(do_full_decode) { 2671 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order); 2672 /*@@@@@@ technically not pessimistic enough, should be more like 2673 if( (FLAC__uint64)order * ((((FLAC__uint64)1)<<bps)-1) * ((1<<subframe->qlp_coeff_precision)-1) < (((FLAC__uint64)-1) << 32) ) 2674 */ 2675 if(bps + subframe->qlp_coeff_precision + FLAC__bitmath_ilog2(order) <= 32) 2676 if(bps <= 16 && subframe->qlp_coeff_precision <= 16) { 2677 if(order <= 8) 2678 decoder->private_->local_lpc_restore_signal_16bit_order8(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order); 2679 else 2680 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); 2681 } 2682 else 2683 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); 2684 else 2685 decoder->private_->local_lpc_restore_signal_64bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order); 2686 } 2687 2688 return true; 2689} 2690 2691FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode) 2692{ 2693 FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim; 2694 FLAC__int32 x, *residual = decoder->private_->residual[channel]; 2695 unsigned i; 2696 2697 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM; 2698 2699 subframe->data = residual; 2700 2701 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) { 2702 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps)) 2703 return false; /* read_callback_ sets the state for us */ 2704 residual[i] = x; 2705 } 2706 2707 /* decode the subframe */ 2708 if(do_full_decode) 2709 memcpy(decoder->private_->output[channel], subframe->data, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize); 2710 2711 return true; 2712} 2713 2714FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, unsigned partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual, FLAC__bool is_extended) 2715{ 2716 FLAC__uint32 rice_parameter; 2717 int i; 2718 unsigned partition, sample, u; 2719 const unsigned partitions = 1u << partition_order; 2720 const unsigned partition_samples = partition_order > 0? decoder->private_->frame.header.blocksize >> partition_order : decoder->private_->frame.header.blocksize - predictor_order; 2721 const unsigned plen = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_PARAMETER_LEN : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN; 2722 const unsigned pesc = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_ESCAPE_PARAMETER : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER; 2723 2724 /* sanity checks */ 2725 if(partition_order == 0) { 2726 if(decoder->private_->frame.header.blocksize < predictor_order) { 2727 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 2728 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2729 return true; 2730 } 2731 } 2732 else { 2733 if(partition_samples < predictor_order) { 2734 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 2735 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2736 return true; 2737 } 2738 } 2739 2740 if(!FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(partitioned_rice_contents, max(6, partition_order))) { 2741 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 2742 return false; 2743 } 2744 2745 sample = 0; 2746 for(partition = 0; partition < partitions; partition++) { 2747 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, plen)) 2748 return false; /* read_callback_ sets the state for us */ 2749 partitioned_rice_contents->parameters[partition] = rice_parameter; 2750 if(rice_parameter < pesc) { 2751 partitioned_rice_contents->raw_bits[partition] = 0; 2752 u = (partition_order == 0 || partition > 0)? partition_samples : partition_samples - predictor_order; 2753 if(!decoder->private_->local_bitreader_read_rice_signed_block(decoder->private_->input, residual + sample, u, rice_parameter)) 2754 return false; /* read_callback_ sets the state for us */ 2755 sample += u; 2756 } 2757 else { 2758 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN)) 2759 return false; /* read_callback_ sets the state for us */ 2760 partitioned_rice_contents->raw_bits[partition] = rice_parameter; 2761 for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) { 2762 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i, rice_parameter)) 2763 return false; /* read_callback_ sets the state for us */ 2764 residual[sample] = i; 2765 } 2766 } 2767 } 2768 2769 return true; 2770} 2771 2772FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder) 2773{ 2774 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) { 2775 FLAC__uint32 zero = 0; 2776 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &zero, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input))) 2777 return false; /* read_callback_ sets the state for us */ 2778 if(zero != 0) { 2779 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 2780 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2781 } 2782 } 2783 return true; 2784} 2785 2786FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data) 2787{ 2788 FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data; 2789 2790 if( 2791#if FLAC__HAS_OGG 2792 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */ 2793 !decoder->private_->is_ogg && 2794#endif 2795 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data) 2796 ) { 2797 *bytes = 0; 2798 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM; 2799 return false; 2800 } 2801 else if(*bytes > 0) { 2802 /* While seeking, it is possible for our seek to land in the 2803 * middle of audio data that looks exactly like a frame header 2804 * from a future version of an encoder. When that happens, our 2805 * error callback will get an 2806 * FLAC__STREAM_DECODER_UNPARSEABLE_STREAM and increment its 2807 * unparseable_frame_count. But there is a remote possibility 2808 * that it is properly synced at such a "future-codec frame", 2809 * so to make sure, we wait to see many "unparseable" errors in 2810 * a row before bailing out. 2811 */ 2812 if(decoder->private_->is_seeking && decoder->private_->unparseable_frame_count > 20) { 2813 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED; 2814 return false; 2815 } 2816 else { 2817 const FLAC__StreamDecoderReadStatus status = 2818#if FLAC__HAS_OGG 2819 decoder->private_->is_ogg? 2820 read_callback_ogg_aspect_(decoder, buffer, bytes) : 2821#endif 2822 decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data) 2823 ; 2824 if(status == FLAC__STREAM_DECODER_READ_STATUS_ABORT) { 2825 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED; 2826 return false; 2827 } 2828 else if(*bytes == 0) { 2829 if( 2830 status == FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM || 2831 ( 2832#if FLAC__HAS_OGG 2833 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */ 2834 !decoder->private_->is_ogg && 2835#endif 2836 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data) 2837 ) 2838 ) { 2839 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM; 2840 return false; 2841 } 2842 else 2843 return true; 2844 } 2845 else 2846 return true; 2847 } 2848 } 2849 else { 2850 /* abort to avoid a deadlock */ 2851 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED; 2852 return false; 2853 } 2854 /* [1] @@@ HACK NOTE: The end-of-stream checking has to be hacked around 2855 * for Ogg FLAC. This is because the ogg decoder aspect can lose sync 2856 * and at the same time hit the end of the stream (for example, seeking 2857 * to a point that is after the beginning of the last Ogg page). There 2858 * is no way to report an Ogg sync loss through the callbacks (see note 2859 * in read_callback_ogg_aspect_()) so it returns CONTINUE with *bytes==0. 2860 * So to keep the decoder from stopping at this point we gate the call 2861 * to the eof_callback and let the Ogg decoder aspect set the 2862 * end-of-stream state when it is needed. 2863 */ 2864} 2865 2866#if FLAC__HAS_OGG 2867FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes) 2868{ 2869 switch(FLAC__ogg_decoder_aspect_read_callback_wrapper(&decoder->protected_->ogg_decoder_aspect, buffer, bytes, read_callback_proxy_, decoder, decoder->private_->client_data)) { 2870 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK: 2871 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE; 2872 /* we don't really have a way to handle lost sync via read 2873 * callback so we'll let it pass and let the underlying 2874 * FLAC decoder catch the error 2875 */ 2876 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_LOST_SYNC: 2877 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE; 2878 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM: 2879 return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM; 2880 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_NOT_FLAC: 2881 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_UNSUPPORTED_MAPPING_VERSION: 2882 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT: 2883 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ERROR: 2884 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_MEMORY_ALLOCATION_ERROR: 2885 return FLAC__STREAM_DECODER_READ_STATUS_ABORT; 2886 default: 2887 FLAC__ASSERT(0); 2888 /* double protection */ 2889 return FLAC__STREAM_DECODER_READ_STATUS_ABORT; 2890 } 2891} 2892 2893FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data) 2894{ 2895 FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder*)void_decoder; 2896 2897 switch(decoder->private_->read_callback(decoder, buffer, bytes, client_data)) { 2898 case FLAC__STREAM_DECODER_READ_STATUS_CONTINUE: 2899 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK; 2900 case FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM: 2901 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM; 2902 case FLAC__STREAM_DECODER_READ_STATUS_ABORT: 2903 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT; 2904 default: 2905 /* double protection: */ 2906 FLAC__ASSERT(0); 2907 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT; 2908 } 2909} 2910#endif 2911 2912FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[]) 2913{ 2914 if(decoder->private_->is_seeking) { 2915 FLAC__uint64 this_frame_sample = frame->header.number.sample_number; 2916 FLAC__uint64 next_frame_sample = this_frame_sample + (FLAC__uint64)frame->header.blocksize; 2917 FLAC__uint64 target_sample = decoder->private_->target_sample; 2918 2919 FLAC__ASSERT(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); 2920 2921#if FLAC__HAS_OGG 2922 decoder->private_->got_a_frame = true; 2923#endif 2924 decoder->private_->last_frame = *frame; /* save the frame */ 2925 if(this_frame_sample <= target_sample && target_sample < next_frame_sample) { /* we hit our target frame */ 2926 unsigned delta = (unsigned)(target_sample - this_frame_sample); 2927 /* kick out of seek mode */ 2928 decoder->private_->is_seeking = false; 2929 /* shift out the samples before target_sample */ 2930 if(delta > 0) { 2931 unsigned channel; 2932 const FLAC__int32 *newbuffer[FLAC__MAX_CHANNELS]; 2933 for(channel = 0; channel < frame->header.channels; channel++) 2934 newbuffer[channel] = buffer[channel] + delta; 2935 decoder->private_->last_frame.header.blocksize -= delta; 2936 decoder->private_->last_frame.header.number.sample_number += (FLAC__uint64)delta; 2937 /* write the relevant samples */ 2938 return decoder->private_->write_callback(decoder, &decoder->private_->last_frame, newbuffer, decoder->private_->client_data); 2939 } 2940 else { 2941 /* write the relevant samples */ 2942 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data); 2943 } 2944 } 2945 else { 2946 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; 2947 } 2948 } 2949 else { 2950 /* 2951 * If we never got STREAMINFO, turn off MD5 checking to save 2952 * cycles since we don't have a sum to compare to anyway 2953 */ 2954 if(!decoder->private_->has_stream_info) 2955 decoder->private_->do_md5_checking = false; 2956 if(decoder->private_->do_md5_checking) { 2957 if(!FLAC__MD5Accumulate(&decoder->private_->md5context, buffer, frame->header.channels, frame->header.blocksize, (frame->header.bits_per_sample+7) / 8)) 2958 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; 2959 } 2960 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data); 2961 } 2962} 2963 2964void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status) 2965{ 2966 if(!decoder->private_->is_seeking) 2967 decoder->private_->error_callback(decoder, status, decoder->private_->client_data); 2968 else if(status == FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM) 2969 decoder->private_->unparseable_frame_count++; 2970} 2971 2972FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample) 2973{ 2974 FLAC__uint64 first_frame_offset = decoder->private_->first_frame_offset, lower_bound, upper_bound, lower_bound_sample, upper_bound_sample, this_frame_sample; 2975 FLAC__int64 pos = -1; 2976 int i; 2977 unsigned approx_bytes_per_frame; 2978 FLAC__bool first_seek = true; 2979 const FLAC__uint64 total_samples = FLAC__stream_decoder_get_total_samples(decoder); 2980 const unsigned min_blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize; 2981 const unsigned max_blocksize = decoder->private_->stream_info.data.stream_info.max_blocksize; 2982 const unsigned max_framesize = decoder->private_->stream_info.data.stream_info.max_framesize; 2983 const unsigned min_framesize = decoder->private_->stream_info.data.stream_info.min_framesize; 2984 /* take these from the current frame in case they've changed mid-stream */ 2985 unsigned channels = FLAC__stream_decoder_get_channels(decoder); 2986 unsigned bps = FLAC__stream_decoder_get_bits_per_sample(decoder); 2987 const FLAC__StreamMetadata_SeekTable *seek_table = decoder->private_->has_seek_table? &decoder->private_->seek_table.data.seek_table : 0; 2988 2989 /* use values from stream info if we didn't decode a frame */ 2990 if(channels == 0) 2991 channels = decoder->private_->stream_info.data.stream_info.channels; 2992 if(bps == 0) 2993 bps = decoder->private_->stream_info.data.stream_info.bits_per_sample; 2994 2995 /* we are just guessing here */ 2996 if(max_framesize > 0) 2997 approx_bytes_per_frame = (max_framesize + min_framesize) / 2 + 1; 2998 /* 2999 * Check if it's a known fixed-blocksize stream. Note that though 3000 * the spec doesn't allow zeroes in the STREAMINFO block, we may 3001 * never get a STREAMINFO block when decoding so the value of 3002 * min_blocksize might be zero. 3003 */ 3004 else if(min_blocksize == max_blocksize && min_blocksize > 0) { 3005 /* note there are no () around 'bps/8' to keep precision up since it's an integer calulation */ 3006 approx_bytes_per_frame = min_blocksize * channels * bps/8 + 64; 3007 } 3008 else 3009 approx_bytes_per_frame = 4096 * channels * bps/8 + 64; 3010 3011 /* 3012 * First, we set an upper and lower bound on where in the 3013 * stream we will search. For now we assume the worst case 3014 * scenario, which is our best guess at the beginning of 3015 * the first frame and end of the stream. 3016 */ 3017 lower_bound = first_frame_offset; 3018 lower_bound_sample = 0; 3019 upper_bound = stream_length; 3020 upper_bound_sample = total_samples > 0 ? total_samples : target_sample /*estimate it*/; 3021 3022 /* 3023 * Now we refine the bounds if we have a seektable with 3024 * suitable points. Note that according to the spec they 3025 * must be ordered by ascending sample number. 3026 * 3027 * Note: to protect against invalid seek tables we will ignore points 3028 * that have frame_samples==0 or sample_number>=total_samples 3029 */ 3030 if(seek_table) { 3031 FLAC__uint64 new_lower_bound = lower_bound; 3032 FLAC__uint64 new_upper_bound = upper_bound; 3033 FLAC__uint64 new_lower_bound_sample = lower_bound_sample; 3034 FLAC__uint64 new_upper_bound_sample = upper_bound_sample; 3035 3036 /* find the closest seek point <= target_sample, if it exists */ 3037 for(i = (int)seek_table->num_points - 1; i >= 0; i--) { 3038 if( 3039 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER && 3040 seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */ 3041 (total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */ 3042 seek_table->points[i].sample_number <= target_sample 3043 ) 3044 break; 3045 } 3046 if(i >= 0) { /* i.e. we found a suitable seek point... */ 3047 new_lower_bound = first_frame_offset + seek_table->points[i].stream_offset; 3048 new_lower_bound_sample = seek_table->points[i].sample_number; 3049 } 3050 3051 /* find the closest seek point > target_sample, if it exists */ 3052 for(i = 0; i < (int)seek_table->num_points; i++) { 3053 if( 3054 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER && 3055 seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */ 3056 (total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */ 3057 seek_table->points[i].sample_number > target_sample 3058 ) 3059 break; 3060 } 3061 if(i < (int)seek_table->num_points) { /* i.e. we found a suitable seek point... */ 3062 new_upper_bound = first_frame_offset + seek_table->points[i].stream_offset; 3063 new_upper_bound_sample = seek_table->points[i].sample_number; 3064 } 3065 /* final protection against unsorted seek tables; keep original values if bogus */ 3066 if(new_upper_bound >= new_lower_bound) { 3067 lower_bound = new_lower_bound; 3068 upper_bound = new_upper_bound; 3069 lower_bound_sample = new_lower_bound_sample; 3070 upper_bound_sample = new_upper_bound_sample; 3071 } 3072 } 3073 3074 FLAC__ASSERT(upper_bound_sample >= lower_bound_sample); 3075 /* there are 2 insidious ways that the following equality occurs, which 3076 * we need to fix: 3077 * 1) total_samples is 0 (unknown) and target_sample is 0 3078 * 2) total_samples is 0 (unknown) and target_sample happens to be 3079 * exactly equal to the last seek point in the seek table; this 3080 * means there is no seek point above it, and upper_bound_samples 3081 * remains equal to the estimate (of target_samples) we made above 3082 * in either case it does not hurt to move upper_bound_sample up by 1 3083 */ 3084 if(upper_bound_sample == lower_bound_sample) 3085 upper_bound_sample++; 3086 3087 decoder->private_->target_sample = target_sample; 3088 while(1) { 3089 /* check if the bounds are still ok */ 3090 if (lower_bound_sample >= upper_bound_sample || lower_bound > upper_bound) { 3091 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3092 return false; 3093 } 3094#ifndef FLAC__INTEGER_ONLY_LIBRARY 3095#if defined _MSC_VER || defined __MINGW32__ 3096 /* with VC++ you have to spoon feed it the casting */ 3097 pos = (FLAC__int64)lower_bound + (FLAC__int64)((FLAC__double)(FLAC__int64)(target_sample - lower_bound_sample) / (FLAC__double)(FLAC__int64)(upper_bound_sample - lower_bound_sample) * (FLAC__double)(FLAC__int64)(upper_bound - lower_bound)) - approx_bytes_per_frame; 3098#else 3099 pos = (FLAC__int64)lower_bound + (FLAC__int64)((FLAC__double)(target_sample - lower_bound_sample) / (FLAC__double)(upper_bound_sample - lower_bound_sample) * (FLAC__double)(upper_bound - lower_bound)) - approx_bytes_per_frame; 3100#endif 3101#else 3102 /* a little less accurate: */ 3103 if(upper_bound - lower_bound < 0xffffffff) 3104 pos = (FLAC__int64)lower_bound + (FLAC__int64)(((target_sample - lower_bound_sample) * (upper_bound - lower_bound)) / (upper_bound_sample - lower_bound_sample)) - approx_bytes_per_frame; 3105 else /* @@@ WATCHOUT, ~2TB limit */ 3106 pos = (FLAC__int64)lower_bound + (FLAC__int64)((((target_sample - lower_bound_sample)>>8) * ((upper_bound - lower_bound)>>8)) / ((upper_bound_sample - lower_bound_sample)>>16)) - approx_bytes_per_frame; 3107#endif 3108 if(pos >= (FLAC__int64)upper_bound) 3109 pos = (FLAC__int64)upper_bound - 1; 3110 if(pos < (FLAC__int64)lower_bound) 3111 pos = (FLAC__int64)lower_bound; 3112 if(decoder->private_->seek_callback(decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) { 3113 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3114 return false; 3115 } 3116 if(!FLAC__stream_decoder_flush(decoder)) { 3117 /* above call sets the state for us */ 3118 return false; 3119 } 3120 /* Now we need to get a frame. First we need to reset our 3121 * unparseable_frame_count; if we get too many unparseable 3122 * frames in a row, the read callback will return 3123 * FLAC__STREAM_DECODER_READ_STATUS_ABORT, causing 3124 * FLAC__stream_decoder_process_single() to return false. 3125 */ 3126 decoder->private_->unparseable_frame_count = 0; 3127 if(!FLAC__stream_decoder_process_single(decoder)) { 3128 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3129 return false; 3130 } 3131 /* our write callback will change the state when it gets to the target frame */ 3132 /* actually, we could have got_a_frame if our decoder is at FLAC__STREAM_DECODER_END_OF_STREAM so we need to check for that also */ 3133#if 0 3134 /*@@@@@@ used to be the following; not clear if the check for end of stream is needed anymore */ 3135 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING && decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM) 3136 break; 3137#endif 3138 if(!decoder->private_->is_seeking) 3139 break; 3140 3141 FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); 3142 this_frame_sample = decoder->private_->last_frame.header.number.sample_number; 3143 3144 if (0 == decoder->private_->samples_decoded || (this_frame_sample + decoder->private_->last_frame.header.blocksize >= upper_bound_sample && !first_seek)) { 3145 if (pos == (FLAC__int64)lower_bound) { 3146 /* can't move back any more than the first frame, something is fatally wrong */ 3147 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3148 return false; 3149 } 3150 /* our last move backwards wasn't big enough, try again */ 3151 approx_bytes_per_frame = approx_bytes_per_frame? approx_bytes_per_frame * 2 : 16; 3152 continue; 3153 } 3154 /* allow one seek over upper bound, so we can get a correct upper_bound_sample for streams with unknown total_samples */ 3155 first_seek = false; 3156 3157 /* make sure we are not seeking in corrupted stream */ 3158 if (this_frame_sample < lower_bound_sample) { 3159 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3160 return false; 3161 } 3162 3163 /* we need to narrow the search */ 3164 if(target_sample < this_frame_sample) { 3165 upper_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize; 3166/*@@@@@@ what will decode position be if at end of stream? */ 3167 if(!FLAC__stream_decoder_get_decode_position(decoder, &upper_bound)) { 3168 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3169 return false; 3170 } 3171 approx_bytes_per_frame = (unsigned)(2 * (upper_bound - pos) / 3 + 16); 3172 } 3173 else { /* target_sample >= this_frame_sample + this frame's blocksize */ 3174 lower_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize; 3175 if(!FLAC__stream_decoder_get_decode_position(decoder, &lower_bound)) { 3176 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3177 return false; 3178 } 3179 approx_bytes_per_frame = (unsigned)(2 * (lower_bound - pos) / 3 + 16); 3180 } 3181 } 3182 3183 return true; 3184} 3185 3186#if FLAC__HAS_OGG 3187FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample) 3188{ 3189 FLAC__uint64 left_pos = 0, right_pos = stream_length; 3190 FLAC__uint64 left_sample = 0, right_sample = FLAC__stream_decoder_get_total_samples(decoder); 3191 FLAC__uint64 this_frame_sample = (FLAC__uint64)0 - 1; 3192 FLAC__uint64 pos = 0; /* only initialized to avoid compiler warning */ 3193 FLAC__bool did_a_seek; 3194 unsigned iteration = 0; 3195 3196 /* In the first iterations, we will calculate the target byte position 3197 * by the distance from the target sample to left_sample and 3198 * right_sample (let's call it "proportional search"). After that, we 3199 * will switch to binary search. 3200 */ 3201 unsigned BINARY_SEARCH_AFTER_ITERATION = 2; 3202 3203 /* We will switch to a linear search once our current sample is less 3204 * than this number of samples ahead of the target sample 3205 */ 3206 static const FLAC__uint64 LINEAR_SEARCH_WITHIN_SAMPLES = FLAC__MAX_BLOCK_SIZE * 2; 3207 3208 /* If the total number of samples is unknown, use a large value, and 3209 * force binary search immediately. 3210 */ 3211 if(right_sample == 0) { 3212 right_sample = (FLAC__uint64)(-1); 3213 BINARY_SEARCH_AFTER_ITERATION = 0; 3214 } 3215 3216 decoder->private_->target_sample = target_sample; 3217 for( ; ; iteration++) { 3218 if (iteration == 0 || this_frame_sample > target_sample || target_sample - this_frame_sample > LINEAR_SEARCH_WITHIN_SAMPLES) { 3219 if (iteration >= BINARY_SEARCH_AFTER_ITERATION) { 3220 pos = (right_pos + left_pos) / 2; 3221 } 3222 else { 3223#ifndef FLAC__INTEGER_ONLY_LIBRARY 3224#if defined _MSC_VER || defined __MINGW32__ 3225 /* with MSVC you have to spoon feed it the casting */ 3226 pos = (FLAC__uint64)((FLAC__double)(FLAC__int64)(target_sample - left_sample) / (FLAC__double)(FLAC__int64)(right_sample - left_sample) * (FLAC__double)(FLAC__int64)(right_pos - left_pos)); 3227#else 3228 pos = (FLAC__uint64)((FLAC__double)(target_sample - left_sample) / (FLAC__double)(right_sample - left_sample) * (FLAC__double)(right_pos - left_pos)); 3229#endif 3230#else 3231 /* a little less accurate: */ 3232 if ((target_sample-left_sample <= 0xffffffff) && (right_pos-left_pos <= 0xffffffff)) 3233 pos = (FLAC__int64)(((target_sample-left_sample) * (right_pos-left_pos)) / (right_sample-left_sample)); 3234 else /* @@@ WATCHOUT, ~2TB limit */ 3235 pos = (FLAC__int64)((((target_sample-left_sample)>>8) * ((right_pos-left_pos)>>8)) / ((right_sample-left_sample)>>16)); 3236#endif 3237 /* @@@ TODO: might want to limit pos to some distance 3238 * before EOF, to make sure we land before the last frame, 3239 * thereby getting a this_frame_sample and so having a better 3240 * estimate. 3241 */ 3242 } 3243 3244 /* physical seek */ 3245 if(decoder->private_->seek_callback((FLAC__StreamDecoder*)decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) { 3246 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3247 return false; 3248 } 3249 if(!FLAC__stream_decoder_flush(decoder)) { 3250 /* above call sets the state for us */ 3251 return false; 3252 } 3253 did_a_seek = true; 3254 } 3255 else 3256 did_a_seek = false; 3257 3258 decoder->private_->got_a_frame = false; 3259 if(!FLAC__stream_decoder_process_single(decoder)) { 3260 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3261 return false; 3262 } 3263 if(!decoder->private_->got_a_frame) { 3264 if(did_a_seek) { 3265 /* this can happen if we seek to a point after the last frame; we drop 3266 * to binary search right away in this case to avoid any wasted 3267 * iterations of proportional search. 3268 */ 3269 right_pos = pos; 3270 BINARY_SEARCH_AFTER_ITERATION = 0; 3271 } 3272 else { 3273 /* this can probably only happen if total_samples is unknown and the 3274 * target_sample is past the end of the stream 3275 */ 3276 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3277 return false; 3278 } 3279 } 3280 /* our write callback will change the state when it gets to the target frame */ 3281 else if(!decoder->private_->is_seeking) { 3282 break; 3283 } 3284 else { 3285 this_frame_sample = decoder->private_->last_frame.header.number.sample_number; 3286 FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); 3287 3288 if (did_a_seek) { 3289 if (this_frame_sample <= target_sample) { 3290 /* The 'equal' case should not happen, since 3291 * FLAC__stream_decoder_process_single() 3292 * should recognize that it has hit the 3293 * target sample and we would exit through 3294 * the 'break' above. 3295 */ 3296 FLAC__ASSERT(this_frame_sample != target_sample); 3297 3298 left_sample = this_frame_sample; 3299 /* sanity check to avoid infinite loop */ 3300 if (left_pos == pos) { 3301 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3302 return false; 3303 } 3304 left_pos = pos; 3305 } 3306 else if(this_frame_sample > target_sample) { 3307 right_sample = this_frame_sample; 3308 /* sanity check to avoid infinite loop */ 3309 if (right_pos == pos) { 3310 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3311 return false; 3312 } 3313 right_pos = pos; 3314 } 3315 } 3316 } 3317 } 3318 3319 return true; 3320} 3321#endif 3322 3323FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data) 3324{ 3325 (void)client_data; 3326 3327 if(*bytes > 0) { 3328 *bytes = fread(buffer, sizeof(FLAC__byte), *bytes, decoder->private_->file); 3329 if(ferror(decoder->private_->file)) 3330 return FLAC__STREAM_DECODER_READ_STATUS_ABORT; 3331 else if(*bytes == 0) 3332 return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM; 3333 else 3334 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE; 3335 } 3336 else 3337 return FLAC__STREAM_DECODER_READ_STATUS_ABORT; /* abort to avoid a deadlock */ 3338} 3339 3340FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data) 3341{ 3342 (void)client_data; 3343 3344 if(decoder->private_->file == stdin) 3345 return FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED; 3346 else if(fseeko(decoder->private_->file, (off_t)absolute_byte_offset, SEEK_SET) < 0) 3347 return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR; 3348 else 3349 return FLAC__STREAM_DECODER_SEEK_STATUS_OK; 3350} 3351 3352FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data) 3353{ 3354 off_t pos; 3355 (void)client_data; 3356 3357 if(decoder->private_->file == stdin) 3358 return FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED; 3359 else if((pos = ftello(decoder->private_->file)) < 0) 3360 return FLAC__STREAM_DECODER_TELL_STATUS_ERROR; 3361 else { 3362 *absolute_byte_offset = (FLAC__uint64)pos; 3363 return FLAC__STREAM_DECODER_TELL_STATUS_OK; 3364 } 3365} 3366 3367FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data) 3368{ 3369 struct stat filestats; 3370 (void)client_data; 3371 3372 if(decoder->private_->file == stdin) 3373 return FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED; 3374 else if(fstat(fileno(decoder->private_->file), &filestats) != 0) 3375 return FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR; 3376 else { 3377 *stream_length = (FLAC__uint64)filestats.st_size; 3378 return FLAC__STREAM_DECODER_LENGTH_STATUS_OK; 3379 } 3380} 3381 3382FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data) 3383{ 3384 (void)client_data; 3385 3386 return feof(decoder->private_->file)? true : false; 3387} 3388