1 /* libFLAC - Free Lossless Audio Codec library 2 * Copyright (C) 2000-2009 Josh Coalson 3 * Copyright (C) 2011-2014 Xiph.Org Foundation 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * - Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 12 * - Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * - Neither the name of the Xiph.org Foundation nor the names of its 17 * contributors may be used to endorse or promote products derived from 18 * this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR 24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #ifdef HAVE_CONFIG_H 34 # include <config.h> 35 #endif 36 37 #include <stdio.h> 38 #include <stdlib.h> /* for malloc() */ 39 #include <string.h> /* for memset/memcpy() */ 40 #include <sys/stat.h> /* for stat() */ 41 #include <sys/types.h> /* for off_t */ 42 #include "share/compat.h" 43 #include "FLAC/assert.h" 44 #include "share/alloc.h" 45 #include "protected/stream_decoder.h" 46 #include "private/bitreader.h" 47 #include "private/bitmath.h" 48 #include "private/cpu.h" 49 #include "private/crc.h" 50 #include "private/fixed.h" 51 #include "private/format.h" 52 #include "private/lpc.h" 53 #include "private/md5.h" 54 #include "private/memory.h" 55 #include "private/macros.h" 56 57 58 /* technically this should be in an "export.c" but this is convenient enough */ 59 FLAC_API int FLAC_API_SUPPORTS_OGG_FLAC = 60 #if FLAC__HAS_OGG 61 1 62 #else 63 0 64 #endif 65 ; 66 67 68 /*********************************************************************** 69 * 70 * Private static data 71 * 72 ***********************************************************************/ 73 74 static const FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' }; 75 76 /*********************************************************************** 77 * 78 * Private class method prototypes 79 * 80 ***********************************************************************/ 81 82 static void set_defaults_(FLAC__StreamDecoder *decoder); 83 static FILE *get_binary_stdin_(void); 84 static FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels); 85 static FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id); 86 static FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder); 87 static FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder); 88 static FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length); 89 static FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length); 90 static FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj, unsigned length); 91 static FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj); 92 static FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj); 93 static FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder); 94 static FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder); 95 static FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode); 96 static FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder); 97 static FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode); 98 static FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode); 99 static FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode); 100 static FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode); 101 static FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode); 102 static FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, unsigned partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual, FLAC__bool is_extended); 103 static FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder); 104 static FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data); 105 #if FLAC__HAS_OGG 106 static FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes); 107 static FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data); 108 #endif 109 static FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[]); 110 static void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status); 111 static FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample); 112 #if FLAC__HAS_OGG 113 static FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample); 114 #endif 115 static FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data); 116 static FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data); 117 static FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data); 118 static FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data); 119 static FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data); 120 121 /*********************************************************************** 122 * 123 * Private class data 124 * 125 ***********************************************************************/ 126 127 typedef struct FLAC__StreamDecoderPrivate { 128 #if FLAC__HAS_OGG 129 FLAC__bool is_ogg; 130 #endif 131 FLAC__StreamDecoderReadCallback read_callback; 132 FLAC__StreamDecoderSeekCallback seek_callback; 133 FLAC__StreamDecoderTellCallback tell_callback; 134 FLAC__StreamDecoderLengthCallback length_callback; 135 FLAC__StreamDecoderEofCallback eof_callback; 136 FLAC__StreamDecoderWriteCallback write_callback; 137 FLAC__StreamDecoderMetadataCallback metadata_callback; 138 FLAC__StreamDecoderErrorCallback error_callback; 139 /* generic 32-bit datapath: */ 140 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[]); 141 /* generic 64-bit datapath: */ 142 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[]); 143 /* for use when the signal is <= 16 bits-per-sample, or <= 15 bits-per-sample on a side channel (which requires 1 extra bit): */ 144 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[]); 145 void *client_data; 146 FILE *file; /* only used if FLAC__stream_decoder_init_file()/FLAC__stream_decoder_init_file() called, else NULL */ 147 FLAC__BitReader *input; 148 FLAC__int32 *output[FLAC__MAX_CHANNELS]; 149 FLAC__int32 *residual[FLAC__MAX_CHANNELS]; /* WATCHOUT: these are the aligned pointers; the real pointers that should be free()'d are residual_unaligned[] below */ 150 FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents[FLAC__MAX_CHANNELS]; 151 unsigned output_capacity, output_channels; 152 FLAC__uint32 fixed_block_size, next_fixed_block_size; 153 FLAC__uint64 samples_decoded; 154 FLAC__bool has_stream_info, has_seek_table; 155 FLAC__StreamMetadata stream_info; 156 FLAC__StreamMetadata seek_table; 157 FLAC__bool metadata_filter[128]; /* MAGIC number 128 == total number of metadata block types == 1 << 7 */ 158 FLAC__byte *metadata_filter_ids; 159 size_t metadata_filter_ids_count, metadata_filter_ids_capacity; /* units for both are IDs, not bytes */ 160 FLAC__Frame frame; 161 FLAC__bool cached; /* true if there is a byte in lookahead */ 162 FLAC__CPUInfo cpuinfo; 163 FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */ 164 FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */ 165 /* unaligned (original) pointers to allocated data */ 166 FLAC__int32 *residual_unaligned[FLAC__MAX_CHANNELS]; 167 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 */ 168 FLAC__bool internal_reset_hack; /* used only during init() so we can call reset to set up the decoder without rewinding the input */ 169 FLAC__bool is_seeking; 170 FLAC__MD5Context md5context; 171 FLAC__byte computed_md5sum[16]; /* this is the sum we computed from the decoded data */ 172 /* (the rest of these are only used for seeking) */ 173 FLAC__Frame last_frame; /* holds the info of the last frame we seeked to */ 174 FLAC__uint64 first_frame_offset; /* hint to the seek routine of where in the stream the first audio frame starts */ 175 FLAC__uint64 target_sample; 176 unsigned unparseable_frame_count; /* used to tell whether we're decoding a future version of FLAC or just got a bad sync */ 177 #if FLAC__HAS_OGG 178 FLAC__bool got_a_frame; /* hack needed in Ogg FLAC seek routine to check when process_single() actually writes a frame */ 179 #endif 180 } FLAC__StreamDecoderPrivate; 181 182 /*********************************************************************** 183 * 184 * Public static class data 185 * 186 ***********************************************************************/ 187 188 FLAC_API const char * const FLAC__StreamDecoderStateString[] = { 189 "FLAC__STREAM_DECODER_SEARCH_FOR_METADATA", 190 "FLAC__STREAM_DECODER_READ_METADATA", 191 "FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC", 192 "FLAC__STREAM_DECODER_READ_FRAME", 193 "FLAC__STREAM_DECODER_END_OF_STREAM", 194 "FLAC__STREAM_DECODER_OGG_ERROR", 195 "FLAC__STREAM_DECODER_SEEK_ERROR", 196 "FLAC__STREAM_DECODER_ABORTED", 197 "FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR", 198 "FLAC__STREAM_DECODER_UNINITIALIZED" 199 }; 200 201 FLAC_API const char * const FLAC__StreamDecoderInitStatusString[] = { 202 "FLAC__STREAM_DECODER_INIT_STATUS_OK", 203 "FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER", 204 "FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS", 205 "FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR", 206 "FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE", 207 "FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED" 208 }; 209 210 FLAC_API const char * const FLAC__StreamDecoderReadStatusString[] = { 211 "FLAC__STREAM_DECODER_READ_STATUS_CONTINUE", 212 "FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM", 213 "FLAC__STREAM_DECODER_READ_STATUS_ABORT" 214 }; 215 216 FLAC_API const char * const FLAC__StreamDecoderSeekStatusString[] = { 217 "FLAC__STREAM_DECODER_SEEK_STATUS_OK", 218 "FLAC__STREAM_DECODER_SEEK_STATUS_ERROR", 219 "FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED" 220 }; 221 222 FLAC_API const char * const FLAC__StreamDecoderTellStatusString[] = { 223 "FLAC__STREAM_DECODER_TELL_STATUS_OK", 224 "FLAC__STREAM_DECODER_TELL_STATUS_ERROR", 225 "FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED" 226 }; 227 228 FLAC_API const char * const FLAC__StreamDecoderLengthStatusString[] = { 229 "FLAC__STREAM_DECODER_LENGTH_STATUS_OK", 230 "FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR", 231 "FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED" 232 }; 233 234 FLAC_API const char * const FLAC__StreamDecoderWriteStatusString[] = { 235 "FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE", 236 "FLAC__STREAM_DECODER_WRITE_STATUS_ABORT" 237 }; 238 239 FLAC_API const char * const FLAC__StreamDecoderErrorStatusString[] = { 240 "FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC", 241 "FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER", 242 "FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH", 243 "FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM" 244 }; 245 246 /*********************************************************************** 247 * 248 * Class constructor/destructor 249 * 250 ***********************************************************************/ 251 FLAC_API FLAC__StreamDecoder *FLAC__stream_decoder_new(void) 252 { 253 FLAC__StreamDecoder *decoder; 254 unsigned i; 255 256 FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */ 257 258 decoder = calloc(1, sizeof(FLAC__StreamDecoder)); 259 if(decoder == 0) { 260 return 0; 261 } 262 263 decoder->protected_ = calloc(1, sizeof(FLAC__StreamDecoderProtected)); 264 if(decoder->protected_ == 0) { 265 free(decoder); 266 return 0; 267 } 268 269 decoder->private_ = calloc(1, sizeof(FLAC__StreamDecoderPrivate)); 270 if(decoder->private_ == 0) { 271 free(decoder->protected_); 272 free(decoder); 273 return 0; 274 } 275 276 decoder->private_->input = FLAC__bitreader_new(); 277 if(decoder->private_->input == 0) { 278 free(decoder->private_); 279 free(decoder->protected_); 280 free(decoder); 281 return 0; 282 } 283 284 decoder->private_->metadata_filter_ids_capacity = 16; 285 if(0 == (decoder->private_->metadata_filter_ids = malloc((FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) * decoder->private_->metadata_filter_ids_capacity))) { 286 FLAC__bitreader_delete(decoder->private_->input); 287 free(decoder->private_); 288 free(decoder->protected_); 289 free(decoder); 290 return 0; 291 } 292 293 for(i = 0; i < FLAC__MAX_CHANNELS; i++) { 294 decoder->private_->output[i] = 0; 295 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0; 296 } 297 298 decoder->private_->output_capacity = 0; 299 decoder->private_->output_channels = 0; 300 decoder->private_->has_seek_table = false; 301 302 for(i = 0; i < FLAC__MAX_CHANNELS; i++) 303 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&decoder->private_->partitioned_rice_contents[i]); 304 305 decoder->private_->file = 0; 306 307 set_defaults_(decoder); 308 309 decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED; 310 311 return decoder; 312 } 313 314 FLAC_API void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder) 315 { 316 unsigned i; 317 318 if (decoder == NULL) 319 return ; 320 321 FLAC__ASSERT(0 != decoder->protected_); 322 FLAC__ASSERT(0 != decoder->private_); 323 FLAC__ASSERT(0 != decoder->private_->input); 324 325 (void)FLAC__stream_decoder_finish(decoder); 326 327 if(0 != decoder->private_->metadata_filter_ids) 328 free(decoder->private_->metadata_filter_ids); 329 330 FLAC__bitreader_delete(decoder->private_->input); 331 332 for(i = 0; i < FLAC__MAX_CHANNELS; i++) 333 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&decoder->private_->partitioned_rice_contents[i]); 334 335 free(decoder->private_); 336 free(decoder->protected_); 337 free(decoder); 338 } 339 340 /*********************************************************************** 341 * 342 * Public class methods 343 * 344 ***********************************************************************/ 345 346 static FLAC__StreamDecoderInitStatus init_stream_internal_( 347 FLAC__StreamDecoder *decoder, 348 FLAC__StreamDecoderReadCallback read_callback, 349 FLAC__StreamDecoderSeekCallback seek_callback, 350 FLAC__StreamDecoderTellCallback tell_callback, 351 FLAC__StreamDecoderLengthCallback length_callback, 352 FLAC__StreamDecoderEofCallback eof_callback, 353 FLAC__StreamDecoderWriteCallback write_callback, 354 FLAC__StreamDecoderMetadataCallback metadata_callback, 355 FLAC__StreamDecoderErrorCallback error_callback, 356 void *client_data, 357 FLAC__bool is_ogg 358 ) 359 { 360 FLAC__ASSERT(0 != decoder); 361 362 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 363 return FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED; 364 365 #if !FLAC__HAS_OGG 366 if(is_ogg) 367 return FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER; 368 #endif 369 370 if( 371 0 == read_callback || 372 0 == write_callback || 373 0 == error_callback || 374 (seek_callback && (0 == tell_callback || 0 == length_callback || 0 == eof_callback)) 375 ) 376 return FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS; 377 378 #if FLAC__HAS_OGG 379 decoder->private_->is_ogg = is_ogg; 380 if(is_ogg && !FLAC__ogg_decoder_aspect_init(&decoder->protected_->ogg_decoder_aspect)) 381 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE; 382 #endif 383 384 /* 385 * get the CPU info and set the function pointers 386 */ 387 FLAC__cpu_info(&decoder->private_->cpuinfo); 388 /* first default to the non-asm routines */ 389 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal; 390 decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide; 391 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal; 392 /* now override with asm where appropriate */ 393 #ifndef FLAC__NO_ASM 394 if(decoder->private_->cpuinfo.use_asm) { 395 #ifdef FLAC__CPU_IA32 396 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32); 397 #ifdef FLAC__HAS_NASM 398 decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide_asm_ia32; /* OPT_IA32: was really necessary for GCC < 4.9 */ 399 if(decoder->private_->cpuinfo.ia32.mmx) { 400 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32; 401 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32_mmx; 402 } 403 else { 404 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32; 405 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32; 406 } 407 #endif 408 #ifdef FLAC__HAS_X86INTRIN 409 # if defined FLAC__SSE2_SUPPORTED && !defined FLAC__HAS_NASM /* OPT_SSE: not better than MMX asm */ 410 if(decoder->private_->cpuinfo.ia32.sse2) { 411 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_16_intrin_sse2; 412 } 413 # endif 414 # if defined FLAC__SSE4_1_SUPPORTED 415 if(decoder->private_->cpuinfo.ia32.sse41) { 416 decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide_intrin_sse41; 417 } 418 # endif 419 #endif 420 #elif defined FLAC__CPU_X86_64 421 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_X86_64); 422 /* No useful SSE optimizations yet */ 423 #endif 424 } 425 #endif 426 427 /* from here on, errors are fatal */ 428 429 if(!FLAC__bitreader_init(decoder->private_->input, read_callback_, decoder)) { 430 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 431 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR; 432 } 433 434 decoder->private_->read_callback = read_callback; 435 decoder->private_->seek_callback = seek_callback; 436 decoder->private_->tell_callback = tell_callback; 437 decoder->private_->length_callback = length_callback; 438 decoder->private_->eof_callback = eof_callback; 439 decoder->private_->write_callback = write_callback; 440 decoder->private_->metadata_callback = metadata_callback; 441 decoder->private_->error_callback = error_callback; 442 decoder->private_->client_data = client_data; 443 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0; 444 decoder->private_->samples_decoded = 0; 445 decoder->private_->has_stream_info = false; 446 decoder->private_->cached = false; 447 448 decoder->private_->do_md5_checking = decoder->protected_->md5_checking; 449 decoder->private_->is_seeking = false; 450 451 decoder->private_->internal_reset_hack = true; /* so the following reset does not try to rewind the input */ 452 if(!FLAC__stream_decoder_reset(decoder)) { 453 /* above call sets the state for us */ 454 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR; 455 } 456 457 return FLAC__STREAM_DECODER_INIT_STATUS_OK; 458 } 459 460 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_stream( 461 FLAC__StreamDecoder *decoder, 462 FLAC__StreamDecoderReadCallback read_callback, 463 FLAC__StreamDecoderSeekCallback seek_callback, 464 FLAC__StreamDecoderTellCallback tell_callback, 465 FLAC__StreamDecoderLengthCallback length_callback, 466 FLAC__StreamDecoderEofCallback eof_callback, 467 FLAC__StreamDecoderWriteCallback write_callback, 468 FLAC__StreamDecoderMetadataCallback metadata_callback, 469 FLAC__StreamDecoderErrorCallback error_callback, 470 void *client_data 471 ) 472 { 473 return init_stream_internal_( 474 decoder, 475 read_callback, 476 seek_callback, 477 tell_callback, 478 length_callback, 479 eof_callback, 480 write_callback, 481 metadata_callback, 482 error_callback, 483 client_data, 484 /*is_ogg=*/false 485 ); 486 } 487 488 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_stream( 489 FLAC__StreamDecoder *decoder, 490 FLAC__StreamDecoderReadCallback read_callback, 491 FLAC__StreamDecoderSeekCallback seek_callback, 492 FLAC__StreamDecoderTellCallback tell_callback, 493 FLAC__StreamDecoderLengthCallback length_callback, 494 FLAC__StreamDecoderEofCallback eof_callback, 495 FLAC__StreamDecoderWriteCallback write_callback, 496 FLAC__StreamDecoderMetadataCallback metadata_callback, 497 FLAC__StreamDecoderErrorCallback error_callback, 498 void *client_data 499 ) 500 { 501 return init_stream_internal_( 502 decoder, 503 read_callback, 504 seek_callback, 505 tell_callback, 506 length_callback, 507 eof_callback, 508 write_callback, 509 metadata_callback, 510 error_callback, 511 client_data, 512 /*is_ogg=*/true 513 ); 514 } 515 516 static FLAC__StreamDecoderInitStatus init_FILE_internal_( 517 FLAC__StreamDecoder *decoder, 518 FILE *file, 519 FLAC__StreamDecoderWriteCallback write_callback, 520 FLAC__StreamDecoderMetadataCallback metadata_callback, 521 FLAC__StreamDecoderErrorCallback error_callback, 522 void *client_data, 523 FLAC__bool is_ogg 524 ) 525 { 526 FLAC__ASSERT(0 != decoder); 527 FLAC__ASSERT(0 != file); 528 529 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 530 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED; 531 532 if(0 == write_callback || 0 == error_callback) 533 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS; 534 535 /* 536 * To make sure that our file does not go unclosed after an error, we 537 * must assign the FILE pointer before any further error can occur in 538 * this routine. 539 */ 540 if(file == stdin) 541 file = get_binary_stdin_(); /* just to be safe */ 542 543 decoder->private_->file = file; 544 545 return init_stream_internal_( 546 decoder, 547 file_read_callback_, 548 decoder->private_->file == stdin? 0: file_seek_callback_, 549 decoder->private_->file == stdin? 0: file_tell_callback_, 550 decoder->private_->file == stdin? 0: file_length_callback_, 551 file_eof_callback_, 552 write_callback, 553 metadata_callback, 554 error_callback, 555 client_data, 556 is_ogg 557 ); 558 } 559 560 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_FILE( 561 FLAC__StreamDecoder *decoder, 562 FILE *file, 563 FLAC__StreamDecoderWriteCallback write_callback, 564 FLAC__StreamDecoderMetadataCallback metadata_callback, 565 FLAC__StreamDecoderErrorCallback error_callback, 566 void *client_data 567 ) 568 { 569 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false); 570 } 571 572 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_FILE( 573 FLAC__StreamDecoder *decoder, 574 FILE *file, 575 FLAC__StreamDecoderWriteCallback write_callback, 576 FLAC__StreamDecoderMetadataCallback metadata_callback, 577 FLAC__StreamDecoderErrorCallback error_callback, 578 void *client_data 579 ) 580 { 581 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true); 582 } 583 584 static FLAC__StreamDecoderInitStatus init_file_internal_( 585 FLAC__StreamDecoder *decoder, 586 const char *filename, 587 FLAC__StreamDecoderWriteCallback write_callback, 588 FLAC__StreamDecoderMetadataCallback metadata_callback, 589 FLAC__StreamDecoderErrorCallback error_callback, 590 void *client_data, 591 FLAC__bool is_ogg 592 ) 593 { 594 FILE *file; 595 596 FLAC__ASSERT(0 != decoder); 597 598 /* 599 * To make sure that our file does not go unclosed after an error, we 600 * have to do the same entrance checks here that are later performed 601 * in FLAC__stream_decoder_init_FILE() before the FILE* is assigned. 602 */ 603 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 604 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED; 605 606 if(0 == write_callback || 0 == error_callback) 607 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS; 608 609 file = filename? flac_fopen(filename, "rb") : stdin; 610 611 if(0 == file) 612 return FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE; 613 614 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, is_ogg); 615 } 616 617 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_file( 618 FLAC__StreamDecoder *decoder, 619 const char *filename, 620 FLAC__StreamDecoderWriteCallback write_callback, 621 FLAC__StreamDecoderMetadataCallback metadata_callback, 622 FLAC__StreamDecoderErrorCallback error_callback, 623 void *client_data 624 ) 625 { 626 return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false); 627 } 628 629 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_file( 630 FLAC__StreamDecoder *decoder, 631 const char *filename, 632 FLAC__StreamDecoderWriteCallback write_callback, 633 FLAC__StreamDecoderMetadataCallback metadata_callback, 634 FLAC__StreamDecoderErrorCallback error_callback, 635 void *client_data 636 ) 637 { 638 return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true); 639 } 640 641 FLAC_API FLAC__bool FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder) 642 { 643 FLAC__bool md5_failed = false; 644 unsigned i; 645 646 FLAC__ASSERT(0 != decoder); 647 FLAC__ASSERT(0 != decoder->private_); 648 FLAC__ASSERT(0 != decoder->protected_); 649 650 if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED) 651 return true; 652 653 /* see the comment in FLAC__stream_decoder_reset() as to why we 654 * always call FLAC__MD5Final() 655 */ 656 FLAC__MD5Final(decoder->private_->computed_md5sum, &decoder->private_->md5context); 657 658 if(decoder->private_->has_seek_table && 0 != decoder->private_->seek_table.data.seek_table.points) { 659 free(decoder->private_->seek_table.data.seek_table.points); 660 decoder->private_->seek_table.data.seek_table.points = 0; 661 decoder->private_->has_seek_table = false; 662 } 663 FLAC__bitreader_free(decoder->private_->input); 664 for(i = 0; i < FLAC__MAX_CHANNELS; i++) { 665 /* WATCHOUT: 666 * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the 667 * output arrays have a buffer of up to 3 zeroes in front 668 * (at negative indices) for alignment purposes; we use 4 669 * to keep the data well-aligned. 670 */ 671 if(0 != decoder->private_->output[i]) { 672 free(decoder->private_->output[i]-4); 673 decoder->private_->output[i] = 0; 674 } 675 if(0 != decoder->private_->residual_unaligned[i]) { 676 free(decoder->private_->residual_unaligned[i]); 677 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0; 678 } 679 } 680 decoder->private_->output_capacity = 0; 681 decoder->private_->output_channels = 0; 682 683 #if FLAC__HAS_OGG 684 if(decoder->private_->is_ogg) 685 FLAC__ogg_decoder_aspect_finish(&decoder->protected_->ogg_decoder_aspect); 686 #endif 687 688 if(0 != decoder->private_->file) { 689 if(decoder->private_->file != stdin) 690 fclose(decoder->private_->file); 691 decoder->private_->file = 0; 692 } 693 694 if(decoder->private_->do_md5_checking) { 695 if(memcmp(decoder->private_->stream_info.data.stream_info.md5sum, decoder->private_->computed_md5sum, 16)) 696 md5_failed = true; 697 } 698 decoder->private_->is_seeking = false; 699 700 set_defaults_(decoder); 701 702 decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED; 703 704 return !md5_failed; 705 } 706 707 FLAC_API FLAC__bool FLAC__stream_decoder_set_ogg_serial_number(FLAC__StreamDecoder *decoder, long value) 708 { 709 FLAC__ASSERT(0 != decoder); 710 FLAC__ASSERT(0 != decoder->private_); 711 FLAC__ASSERT(0 != decoder->protected_); 712 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 713 return false; 714 #if FLAC__HAS_OGG 715 /* can't check decoder->private_->is_ogg since that's not set until init time */ 716 FLAC__ogg_decoder_aspect_set_serial_number(&decoder->protected_->ogg_decoder_aspect, value); 717 return true; 718 #else 719 (void)value; 720 return false; 721 #endif 722 } 723 724 FLAC_API FLAC__bool FLAC__stream_decoder_set_md5_checking(FLAC__StreamDecoder *decoder, FLAC__bool value) 725 { 726 FLAC__ASSERT(0 != decoder); 727 FLAC__ASSERT(0 != decoder->protected_); 728 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 729 return false; 730 decoder->protected_->md5_checking = value; 731 return true; 732 } 733 734 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type) 735 { 736 FLAC__ASSERT(0 != decoder); 737 FLAC__ASSERT(0 != decoder->private_); 738 FLAC__ASSERT(0 != decoder->protected_); 739 FLAC__ASSERT((unsigned)type <= FLAC__MAX_METADATA_TYPE_CODE); 740 /* double protection */ 741 if((unsigned)type > FLAC__MAX_METADATA_TYPE_CODE) 742 return false; 743 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 744 return false; 745 decoder->private_->metadata_filter[type] = true; 746 if(type == FLAC__METADATA_TYPE_APPLICATION) 747 decoder->private_->metadata_filter_ids_count = 0; 748 return true; 749 } 750 751 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4]) 752 { 753 FLAC__ASSERT(0 != decoder); 754 FLAC__ASSERT(0 != decoder->private_); 755 FLAC__ASSERT(0 != decoder->protected_); 756 FLAC__ASSERT(0 != id); 757 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 758 return false; 759 760 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION]) 761 return true; 762 763 FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids); 764 765 if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) { 766 if(0 == (decoder->private_->metadata_filter_ids = safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) { 767 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 768 return false; 769 } 770 decoder->private_->metadata_filter_ids_capacity *= 2; 771 } 772 773 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)); 774 decoder->private_->metadata_filter_ids_count++; 775 776 return true; 777 } 778 779 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder) 780 { 781 unsigned i; 782 FLAC__ASSERT(0 != decoder); 783 FLAC__ASSERT(0 != decoder->private_); 784 FLAC__ASSERT(0 != decoder->protected_); 785 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 786 return false; 787 for(i = 0; i < sizeof(decoder->private_->metadata_filter) / sizeof(decoder->private_->metadata_filter[0]); i++) 788 decoder->private_->metadata_filter[i] = true; 789 decoder->private_->metadata_filter_ids_count = 0; 790 return true; 791 } 792 793 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type) 794 { 795 FLAC__ASSERT(0 != decoder); 796 FLAC__ASSERT(0 != decoder->private_); 797 FLAC__ASSERT(0 != decoder->protected_); 798 FLAC__ASSERT((unsigned)type <= FLAC__MAX_METADATA_TYPE_CODE); 799 /* double protection */ 800 if((unsigned)type > FLAC__MAX_METADATA_TYPE_CODE) 801 return false; 802 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 803 return false; 804 decoder->private_->metadata_filter[type] = false; 805 if(type == FLAC__METADATA_TYPE_APPLICATION) 806 decoder->private_->metadata_filter_ids_count = 0; 807 return true; 808 } 809 810 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4]) 811 { 812 FLAC__ASSERT(0 != decoder); 813 FLAC__ASSERT(0 != decoder->private_); 814 FLAC__ASSERT(0 != decoder->protected_); 815 FLAC__ASSERT(0 != id); 816 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 817 return false; 818 819 if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION]) 820 return true; 821 822 FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids); 823 824 if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) { 825 if(0 == (decoder->private_->metadata_filter_ids = safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) { 826 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 827 return false; 828 } 829 decoder->private_->metadata_filter_ids_capacity *= 2; 830 } 831 832 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)); 833 decoder->private_->metadata_filter_ids_count++; 834 835 return true; 836 } 837 838 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder) 839 { 840 FLAC__ASSERT(0 != decoder); 841 FLAC__ASSERT(0 != decoder->private_); 842 FLAC__ASSERT(0 != decoder->protected_); 843 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 844 return false; 845 memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter)); 846 decoder->private_->metadata_filter_ids_count = 0; 847 return true; 848 } 849 850 FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder) 851 { 852 FLAC__ASSERT(0 != decoder); 853 FLAC__ASSERT(0 != decoder->protected_); 854 return decoder->protected_->state; 855 } 856 857 FLAC_API const char *FLAC__stream_decoder_get_resolved_state_string(const FLAC__StreamDecoder *decoder) 858 { 859 return FLAC__StreamDecoderStateString[decoder->protected_->state]; 860 } 861 862 FLAC_API FLAC__bool FLAC__stream_decoder_get_md5_checking(const FLAC__StreamDecoder *decoder) 863 { 864 FLAC__ASSERT(0 != decoder); 865 FLAC__ASSERT(0 != decoder->protected_); 866 return decoder->protected_->md5_checking; 867 } 868 869 FLAC_API FLAC__uint64 FLAC__stream_decoder_get_total_samples(const FLAC__StreamDecoder *decoder) 870 { 871 FLAC__ASSERT(0 != decoder); 872 FLAC__ASSERT(0 != decoder->protected_); 873 return decoder->private_->has_stream_info? decoder->private_->stream_info.data.stream_info.total_samples : 0; 874 } 875 876 FLAC_API unsigned FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder) 877 { 878 FLAC__ASSERT(0 != decoder); 879 FLAC__ASSERT(0 != decoder->protected_); 880 return decoder->protected_->channels; 881 } 882 883 FLAC_API FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder) 884 { 885 FLAC__ASSERT(0 != decoder); 886 FLAC__ASSERT(0 != decoder->protected_); 887 return decoder->protected_->channel_assignment; 888 } 889 890 FLAC_API unsigned FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder) 891 { 892 FLAC__ASSERT(0 != decoder); 893 FLAC__ASSERT(0 != decoder->protected_); 894 return decoder->protected_->bits_per_sample; 895 } 896 897 FLAC_API unsigned FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder) 898 { 899 FLAC__ASSERT(0 != decoder); 900 FLAC__ASSERT(0 != decoder->protected_); 901 return decoder->protected_->sample_rate; 902 } 903 904 FLAC_API unsigned FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder) 905 { 906 FLAC__ASSERT(0 != decoder); 907 FLAC__ASSERT(0 != decoder->protected_); 908 return decoder->protected_->blocksize; 909 } 910 911 FLAC_API FLAC__bool FLAC__stream_decoder_get_decode_position(const FLAC__StreamDecoder *decoder, FLAC__uint64 *position) 912 { 913 FLAC__ASSERT(0 != decoder); 914 FLAC__ASSERT(0 != decoder->private_); 915 FLAC__ASSERT(0 != position); 916 917 #if FLAC__HAS_OGG 918 if(decoder->private_->is_ogg) 919 return false; 920 #endif 921 if(0 == decoder->private_->tell_callback) 922 return false; 923 if(decoder->private_->tell_callback(decoder, position, decoder->private_->client_data) != FLAC__STREAM_DECODER_TELL_STATUS_OK) 924 return false; 925 /* should never happen since all FLAC frames and metadata blocks are byte aligned, but check just in case */ 926 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) 927 return false; 928 FLAC__ASSERT(*position >= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder)); 929 *position -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder); 930 return true; 931 } 932 933 FLAC_API FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder) 934 { 935 FLAC__ASSERT(0 != decoder); 936 FLAC__ASSERT(0 != decoder->private_); 937 FLAC__ASSERT(0 != decoder->protected_); 938 939 decoder->private_->samples_decoded = 0; 940 decoder->private_->do_md5_checking = false; 941 942 #if FLAC__HAS_OGG 943 if(decoder->private_->is_ogg) 944 FLAC__ogg_decoder_aspect_flush(&decoder->protected_->ogg_decoder_aspect); 945 #endif 946 947 if(!FLAC__bitreader_clear(decoder->private_->input)) { 948 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 949 return false; 950 } 951 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 952 953 return true; 954 } 955 956 FLAC_API FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder) 957 { 958 FLAC__ASSERT(0 != decoder); 959 FLAC__ASSERT(0 != decoder->private_); 960 FLAC__ASSERT(0 != decoder->protected_); 961 962 if(!FLAC__stream_decoder_flush(decoder)) { 963 /* above call sets the state for us */ 964 return false; 965 } 966 967 #if FLAC__HAS_OGG 968 /*@@@ could go in !internal_reset_hack block below */ 969 if(decoder->private_->is_ogg) 970 FLAC__ogg_decoder_aspect_reset(&decoder->protected_->ogg_decoder_aspect); 971 #endif 972 973 /* Rewind if necessary. If FLAC__stream_decoder_init() is calling us, 974 * (internal_reset_hack) don't try to rewind since we are already at 975 * the beginning of the stream and don't want to fail if the input is 976 * not seekable. 977 */ 978 if(!decoder->private_->internal_reset_hack) { 979 if(decoder->private_->file == stdin) 980 return false; /* can't rewind stdin, reset fails */ 981 if(decoder->private_->seek_callback && decoder->private_->seek_callback(decoder, 0, decoder->private_->client_data) == FLAC__STREAM_DECODER_SEEK_STATUS_ERROR) 982 return false; /* seekable and seek fails, reset fails */ 983 } 984 else 985 decoder->private_->internal_reset_hack = false; 986 987 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA; 988 989 decoder->private_->has_stream_info = false; 990 if(decoder->private_->has_seek_table && 0 != decoder->private_->seek_table.data.seek_table.points) { 991 free(decoder->private_->seek_table.data.seek_table.points); 992 decoder->private_->seek_table.data.seek_table.points = 0; 993 decoder->private_->has_seek_table = false; 994 } 995 decoder->private_->do_md5_checking = decoder->protected_->md5_checking; 996 /* 997 * This goes in reset() and not flush() because according to the spec, a 998 * fixed-blocksize stream must stay that way through the whole stream. 999 */ 1000 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0; 1001 1002 /* We initialize the FLAC__MD5Context even though we may never use it. This 1003 * is because md5 checking may be turned on to start and then turned off if 1004 * a seek occurs. So we init the context here and finalize it in 1005 * FLAC__stream_decoder_finish() to make sure things are always cleaned up 1006 * properly. 1007 */ 1008 FLAC__MD5Init(&decoder->private_->md5context); 1009 1010 decoder->private_->first_frame_offset = 0; 1011 decoder->private_->unparseable_frame_count = 0; 1012 1013 return true; 1014 } 1015 1016 FLAC_API FLAC__bool FLAC__stream_decoder_process_single(FLAC__StreamDecoder *decoder) 1017 { 1018 FLAC__bool got_a_frame; 1019 FLAC__ASSERT(0 != decoder); 1020 FLAC__ASSERT(0 != decoder->protected_); 1021 1022 while(1) { 1023 switch(decoder->protected_->state) { 1024 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA: 1025 if(!find_metadata_(decoder)) 1026 return false; /* above function sets the status for us */ 1027 break; 1028 case FLAC__STREAM_DECODER_READ_METADATA: 1029 if(!read_metadata_(decoder)) 1030 return false; /* above function sets the status for us */ 1031 else 1032 return true; 1033 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC: 1034 if(!frame_sync_(decoder)) 1035 return true; /* above function sets the status for us */ 1036 break; 1037 case FLAC__STREAM_DECODER_READ_FRAME: 1038 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/true)) 1039 return false; /* above function sets the status for us */ 1040 if(got_a_frame) 1041 return true; /* above function sets the status for us */ 1042 break; 1043 case FLAC__STREAM_DECODER_END_OF_STREAM: 1044 case FLAC__STREAM_DECODER_ABORTED: 1045 return true; 1046 default: 1047 FLAC__ASSERT(0); 1048 return false; 1049 } 1050 } 1051 } 1052 1053 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder *decoder) 1054 { 1055 FLAC__ASSERT(0 != decoder); 1056 FLAC__ASSERT(0 != decoder->protected_); 1057 1058 while(1) { 1059 switch(decoder->protected_->state) { 1060 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA: 1061 if(!find_metadata_(decoder)) 1062 return false; /* above function sets the status for us */ 1063 break; 1064 case FLAC__STREAM_DECODER_READ_METADATA: 1065 if(!read_metadata_(decoder)) 1066 return false; /* above function sets the status for us */ 1067 break; 1068 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC: 1069 case FLAC__STREAM_DECODER_READ_FRAME: 1070 case FLAC__STREAM_DECODER_END_OF_STREAM: 1071 case FLAC__STREAM_DECODER_ABORTED: 1072 return true; 1073 default: 1074 FLAC__ASSERT(0); 1075 return false; 1076 } 1077 } 1078 } 1079 1080 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder *decoder) 1081 { 1082 FLAC__bool dummy; 1083 FLAC__ASSERT(0 != decoder); 1084 FLAC__ASSERT(0 != decoder->protected_); 1085 1086 while(1) { 1087 switch(decoder->protected_->state) { 1088 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA: 1089 if(!find_metadata_(decoder)) 1090 return false; /* above function sets the status for us */ 1091 break; 1092 case FLAC__STREAM_DECODER_READ_METADATA: 1093 if(!read_metadata_(decoder)) 1094 return false; /* above function sets the status for us */ 1095 break; 1096 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC: 1097 if(!frame_sync_(decoder)) 1098 return true; /* above function sets the status for us */ 1099 break; 1100 case FLAC__STREAM_DECODER_READ_FRAME: 1101 if(!read_frame_(decoder, &dummy, /*do_full_decode=*/true)) 1102 return false; /* above function sets the status for us */ 1103 break; 1104 case FLAC__STREAM_DECODER_END_OF_STREAM: 1105 case FLAC__STREAM_DECODER_ABORTED: 1106 return true; 1107 default: 1108 FLAC__ASSERT(0); 1109 return false; 1110 } 1111 } 1112 } 1113 1114 FLAC_API FLAC__bool FLAC__stream_decoder_skip_single_frame(FLAC__StreamDecoder *decoder) 1115 { 1116 FLAC__bool got_a_frame; 1117 FLAC__ASSERT(0 != decoder); 1118 FLAC__ASSERT(0 != decoder->protected_); 1119 1120 while(1) { 1121 switch(decoder->protected_->state) { 1122 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA: 1123 case FLAC__STREAM_DECODER_READ_METADATA: 1124 return false; /* above function sets the status for us */ 1125 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC: 1126 if(!frame_sync_(decoder)) 1127 return true; /* above function sets the status for us */ 1128 break; 1129 case FLAC__STREAM_DECODER_READ_FRAME: 1130 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/false)) 1131 return false; /* above function sets the status for us */ 1132 if(got_a_frame) 1133 return true; /* above function sets the status for us */ 1134 break; 1135 case FLAC__STREAM_DECODER_END_OF_STREAM: 1136 case FLAC__STREAM_DECODER_ABORTED: 1137 return true; 1138 default: 1139 FLAC__ASSERT(0); 1140 return false; 1141 } 1142 } 1143 } 1144 1145 FLAC_API FLAC__bool FLAC__stream_decoder_seek_absolute(FLAC__StreamDecoder *decoder, FLAC__uint64 sample) 1146 { 1147 FLAC__uint64 length; 1148 1149 FLAC__ASSERT(0 != decoder); 1150 1151 if( 1152 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA && 1153 decoder->protected_->state != FLAC__STREAM_DECODER_READ_METADATA && 1154 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC && 1155 decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME && 1156 decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM 1157 ) 1158 return false; 1159 1160 if(0 == decoder->private_->seek_callback) 1161 return false; 1162 1163 FLAC__ASSERT(decoder->private_->seek_callback); 1164 FLAC__ASSERT(decoder->private_->tell_callback); 1165 FLAC__ASSERT(decoder->private_->length_callback); 1166 FLAC__ASSERT(decoder->private_->eof_callback); 1167 1168 if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder)) 1169 return false; 1170 1171 decoder->private_->is_seeking = true; 1172 1173 /* turn off md5 checking if a seek is attempted */ 1174 decoder->private_->do_md5_checking = false; 1175 1176 /* 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) */ 1177 if(decoder->private_->length_callback(decoder, &length, decoder->private_->client_data) != FLAC__STREAM_DECODER_LENGTH_STATUS_OK) { 1178 decoder->private_->is_seeking = false; 1179 return false; 1180 } 1181 1182 /* if we haven't finished processing the metadata yet, do that so we have the STREAMINFO, SEEK_TABLE, and first_frame_offset */ 1183 if( 1184 decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA || 1185 decoder->protected_->state == FLAC__STREAM_DECODER_READ_METADATA 1186 ) { 1187 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder)) { 1188 /* above call sets the state for us */ 1189 decoder->private_->is_seeking = false; 1190 return false; 1191 } 1192 /* check this again in case we didn't know total_samples the first time */ 1193 if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder)) { 1194 decoder->private_->is_seeking = false; 1195 return false; 1196 } 1197 } 1198 1199 { 1200 const FLAC__bool ok = 1201 #if FLAC__HAS_OGG 1202 decoder->private_->is_ogg? 1203 seek_to_absolute_sample_ogg_(decoder, length, sample) : 1204 #endif 1205 seek_to_absolute_sample_(decoder, length, sample) 1206 ; 1207 decoder->private_->is_seeking = false; 1208 return ok; 1209 } 1210 } 1211 1212 /*********************************************************************** 1213 * 1214 * Protected class methods 1215 * 1216 ***********************************************************************/ 1217 1218 unsigned FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder) 1219 { 1220 FLAC__ASSERT(0 != decoder); 1221 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1222 FLAC__ASSERT(!(FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) & 7)); 1223 return FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) / 8; 1224 } 1225 1226 /*********************************************************************** 1227 * 1228 * Private class methods 1229 * 1230 ***********************************************************************/ 1231 1232 void set_defaults_(FLAC__StreamDecoder *decoder) 1233 { 1234 #if FLAC__HAS_OGG 1235 decoder->private_->is_ogg = false; 1236 #endif 1237 decoder->private_->read_callback = 0; 1238 decoder->private_->seek_callback = 0; 1239 decoder->private_->tell_callback = 0; 1240 decoder->private_->length_callback = 0; 1241 decoder->private_->eof_callback = 0; 1242 decoder->private_->write_callback = 0; 1243 decoder->private_->metadata_callback = 0; 1244 decoder->private_->error_callback = 0; 1245 decoder->private_->client_data = 0; 1246 1247 memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter)); 1248 decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] = true; 1249 decoder->private_->metadata_filter_ids_count = 0; 1250 1251 decoder->protected_->md5_checking = false; 1252 1253 #if FLAC__HAS_OGG 1254 FLAC__ogg_decoder_aspect_set_defaults(&decoder->protected_->ogg_decoder_aspect); 1255 #endif 1256 } 1257 1258 /* 1259 * This will forcibly set stdin to binary mode (for OSes that require it) 1260 */ 1261 FILE *get_binary_stdin_(void) 1262 { 1263 /* if something breaks here it is probably due to the presence or 1264 * absence of an underscore before the identifiers 'setmode', 1265 * 'fileno', and/or 'O_BINARY'; check your system header files. 1266 */ 1267 #if defined _MSC_VER || defined __MINGW32__ 1268 _setmode(_fileno(stdin), _O_BINARY); 1269 #elif defined __CYGWIN__ 1270 /* almost certainly not needed for any modern Cygwin, but let's be safe... */ 1271 setmode(_fileno(stdin), _O_BINARY); 1272 #elif defined __EMX__ 1273 setmode(fileno(stdin), O_BINARY); 1274 #endif 1275 1276 return stdin; 1277 } 1278 1279 FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels) 1280 { 1281 unsigned i; 1282 FLAC__int32 *tmp; 1283 1284 /* Make sure size is some sensible minimum value. Plumb through predictor_order maybe? */ 1285 size = size < FLAC__MAX_LPC_ORDER ? FLAC__MAX_LPC_ORDER : size ; 1286 1287 if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels) 1288 return true; 1289 1290 /* simply using realloc() is not practical because the number of channels may change mid-stream */ 1291 1292 for(i = 0; i < FLAC__MAX_CHANNELS; i++) { 1293 if(0 != decoder->private_->output[i]) { 1294 free(decoder->private_->output[i]-4); 1295 decoder->private_->output[i] = 0; 1296 } 1297 if(0 != decoder->private_->residual_unaligned[i]) { 1298 free(decoder->private_->residual_unaligned[i]); 1299 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0; 1300 } 1301 } 1302 1303 for(i = 0; i < channels; i++) { 1304 /* WATCHOUT: 1305 * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the 1306 * output arrays have a buffer of up to 3 zeroes in front 1307 * (at negative indices) for alignment purposes; we use 4 1308 * to keep the data well-aligned. 1309 */ 1310 tmp = safe_malloc_muladd2_(sizeof(FLAC__int32), /*times (*/size, /*+*/4/*)*/); 1311 if(tmp == 0) { 1312 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1313 return false; 1314 } 1315 memset(tmp, 0, sizeof(FLAC__int32)*4); 1316 decoder->private_->output[i] = tmp + 4; 1317 1318 if(!FLAC__memory_alloc_aligned_int32_array(size, &decoder->private_->residual_unaligned[i], &decoder->private_->residual[i])) { 1319 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1320 return false; 1321 } 1322 } 1323 1324 decoder->private_->output_capacity = size; 1325 decoder->private_->output_channels = channels; 1326 1327 return true; 1328 } 1329 1330 FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id) 1331 { 1332 size_t i; 1333 1334 FLAC__ASSERT(0 != decoder); 1335 FLAC__ASSERT(0 != decoder->private_); 1336 1337 for(i = 0; i < decoder->private_->metadata_filter_ids_count; i++) 1338 if(0 == memcmp(decoder->private_->metadata_filter_ids + i * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8))) 1339 return true; 1340 1341 return false; 1342 } 1343 1344 FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder) 1345 { 1346 FLAC__uint32 x; 1347 unsigned i, id; 1348 FLAC__bool first = true; 1349 1350 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1351 1352 for(i = id = 0; i < 4; ) { 1353 if(decoder->private_->cached) { 1354 x = (FLAC__uint32)decoder->private_->lookahead; 1355 decoder->private_->cached = false; 1356 } 1357 else { 1358 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 1359 return false; /* read_callback_ sets the state for us */ 1360 } 1361 if(x == FLAC__STREAM_SYNC_STRING[i]) { 1362 first = true; 1363 i++; 1364 id = 0; 1365 continue; 1366 } 1367 1368 if(id >= 3) 1369 return false; 1370 1371 if(x == ID3V2_TAG_[id]) { 1372 id++; 1373 i = 0; 1374 if(id == 3) { 1375 if(!skip_id3v2_tag_(decoder)) 1376 return false; /* skip_id3v2_tag_ sets the state for us */ 1377 } 1378 continue; 1379 } 1380 id = 0; 1381 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */ 1382 decoder->private_->header_warmup[0] = (FLAC__byte)x; 1383 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 1384 return false; /* read_callback_ sets the state for us */ 1385 1386 /* 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 */ 1387 /* else we have to check if the second byte is the end of a sync code */ 1388 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */ 1389 decoder->private_->lookahead = (FLAC__byte)x; 1390 decoder->private_->cached = true; 1391 } 1392 else if(x >> 1 == 0x7c) { /* MAGIC NUMBER for the last 6 sync bits and reserved 7th bit */ 1393 decoder->private_->header_warmup[1] = (FLAC__byte)x; 1394 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME; 1395 return true; 1396 } 1397 } 1398 i = 0; 1399 if(first) { 1400 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 1401 first = false; 1402 } 1403 } 1404 1405 decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA; 1406 return true; 1407 } 1408 1409 FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder) 1410 { 1411 FLAC__bool is_last; 1412 FLAC__uint32 i, x, type, length; 1413 1414 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1415 1416 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_IS_LAST_LEN)) 1417 return false; /* read_callback_ sets the state for us */ 1418 is_last = x? true : false; 1419 1420 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN)) 1421 return false; /* read_callback_ sets the state for us */ 1422 1423 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN)) 1424 return false; /* read_callback_ sets the state for us */ 1425 1426 if(type == FLAC__METADATA_TYPE_STREAMINFO) { 1427 if(!read_metadata_streaminfo_(decoder, is_last, length)) 1428 return false; 1429 1430 decoder->private_->has_stream_info = true; 1431 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)) 1432 decoder->private_->do_md5_checking = false; 1433 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] && decoder->private_->metadata_callback) 1434 decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data); 1435 } 1436 else if(type == FLAC__METADATA_TYPE_SEEKTABLE) { 1437 if(!read_metadata_seektable_(decoder, is_last, length)) 1438 return false; 1439 1440 decoder->private_->has_seek_table = true; 1441 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_SEEKTABLE] && decoder->private_->metadata_callback) 1442 decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data); 1443 } 1444 else { 1445 FLAC__bool skip_it = !decoder->private_->metadata_filter[type]; 1446 unsigned real_length = length; 1447 FLAC__StreamMetadata block; 1448 1449 memset(&block, 0, sizeof(block)); 1450 block.is_last = is_last; 1451 block.type = (FLAC__MetadataType)type; 1452 block.length = length; 1453 1454 if(type == FLAC__METADATA_TYPE_APPLICATION) { 1455 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)) 1456 return false; /* read_callback_ sets the state for us */ 1457 1458 if(real_length < FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) { /* underflow check */ 1459 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;/*@@@@@@ maybe wrong error? need to resync?*/ 1460 return false; 1461 } 1462 1463 real_length -= FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8; 1464 1465 if(decoder->private_->metadata_filter_ids_count > 0 && has_id_filtered_(decoder, block.data.application.id)) 1466 skip_it = !skip_it; 1467 } 1468 1469 if(skip_it) { 1470 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length)) 1471 return false; /* read_callback_ sets the state for us */ 1472 } 1473 else { 1474 FLAC__bool ok = true; 1475 switch(type) { 1476 case FLAC__METADATA_TYPE_PADDING: 1477 /* skip the padding bytes */ 1478 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length)) 1479 ok = false; /* read_callback_ sets the state for us */ 1480 break; 1481 case FLAC__METADATA_TYPE_APPLICATION: 1482 /* remember, we read the ID already */ 1483 if(real_length > 0) { 1484 if(0 == (block.data.application.data = malloc(real_length))) { 1485 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1486 ok = false; 1487 } 1488 else if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.data, real_length)) 1489 ok = false; /* read_callback_ sets the state for us */ 1490 } 1491 else 1492 block.data.application.data = 0; 1493 break; 1494 case FLAC__METADATA_TYPE_VORBIS_COMMENT: 1495 if(!read_metadata_vorbiscomment_(decoder, &block.data.vorbis_comment, real_length)) 1496 ok = false; 1497 break; 1498 case FLAC__METADATA_TYPE_CUESHEET: 1499 if(!read_metadata_cuesheet_(decoder, &block.data.cue_sheet)) 1500 ok = false; 1501 break; 1502 case FLAC__METADATA_TYPE_PICTURE: 1503 if(!read_metadata_picture_(decoder, &block.data.picture)) 1504 ok = false; 1505 break; 1506 case FLAC__METADATA_TYPE_STREAMINFO: 1507 case FLAC__METADATA_TYPE_SEEKTABLE: 1508 FLAC__ASSERT(0); 1509 break; 1510 default: 1511 if(real_length > 0) { 1512 if(0 == (block.data.unknown.data = malloc(real_length))) { 1513 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1514 ok = false; 1515 } 1516 else if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.unknown.data, real_length)) 1517 ok = false; /* read_callback_ sets the state for us */ 1518 } 1519 else 1520 block.data.unknown.data = 0; 1521 break; 1522 } 1523 if(ok && !decoder->private_->is_seeking && decoder->private_->metadata_callback) 1524 decoder->private_->metadata_callback(decoder, &block, decoder->private_->client_data); 1525 1526 /* now we have to free any malloc()ed data in the block */ 1527 switch(type) { 1528 case FLAC__METADATA_TYPE_PADDING: 1529 break; 1530 case FLAC__METADATA_TYPE_APPLICATION: 1531 if(0 != block.data.application.data) 1532 free(block.data.application.data); 1533 break; 1534 case FLAC__METADATA_TYPE_VORBIS_COMMENT: 1535 if(0 != block.data.vorbis_comment.vendor_string.entry) 1536 free(block.data.vorbis_comment.vendor_string.entry); 1537 if(block.data.vorbis_comment.num_comments > 0) 1538 for(i = 0; i < block.data.vorbis_comment.num_comments; i++) 1539 if(0 != block.data.vorbis_comment.comments[i].entry) 1540 free(block.data.vorbis_comment.comments[i].entry); 1541 if(0 != block.data.vorbis_comment.comments) 1542 free(block.data.vorbis_comment.comments); 1543 break; 1544 case FLAC__METADATA_TYPE_CUESHEET: 1545 if(block.data.cue_sheet.num_tracks > 0) 1546 for(i = 0; i < block.data.cue_sheet.num_tracks; i++) 1547 if(0 != block.data.cue_sheet.tracks[i].indices) 1548 free(block.data.cue_sheet.tracks[i].indices); 1549 if(0 != block.data.cue_sheet.tracks) 1550 free(block.data.cue_sheet.tracks); 1551 break; 1552 case FLAC__METADATA_TYPE_PICTURE: 1553 if(0 != block.data.picture.mime_type) 1554 free(block.data.picture.mime_type); 1555 if(0 != block.data.picture.description) 1556 free(block.data.picture.description); 1557 if(0 != block.data.picture.data) 1558 free(block.data.picture.data); 1559 break; 1560 case FLAC__METADATA_TYPE_STREAMINFO: 1561 case FLAC__METADATA_TYPE_SEEKTABLE: 1562 FLAC__ASSERT(0); 1563 default: 1564 if(0 != block.data.unknown.data) 1565 free(block.data.unknown.data); 1566 break; 1567 } 1568 1569 if(!ok) /* anything that unsets "ok" should also make sure decoder->protected_->state is updated */ 1570 return false; 1571 } 1572 } 1573 1574 if(is_last) { 1575 /* if this fails, it's OK, it's just a hint for the seek routine */ 1576 if(!FLAC__stream_decoder_get_decode_position(decoder, &decoder->private_->first_frame_offset)) 1577 decoder->private_->first_frame_offset = 0; 1578 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 1579 } 1580 1581 return true; 1582 } 1583 1584 FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length) 1585 { 1586 FLAC__uint32 x; 1587 unsigned bits, used_bits = 0; 1588 1589 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1590 1591 decoder->private_->stream_info.type = FLAC__METADATA_TYPE_STREAMINFO; 1592 decoder->private_->stream_info.is_last = is_last; 1593 decoder->private_->stream_info.length = length; 1594 1595 bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN; 1596 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, bits)) 1597 return false; /* read_callback_ sets the state for us */ 1598 decoder->private_->stream_info.data.stream_info.min_blocksize = x; 1599 used_bits += bits; 1600 1601 bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN; 1602 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN)) 1603 return false; /* read_callback_ sets the state for us */ 1604 decoder->private_->stream_info.data.stream_info.max_blocksize = x; 1605 used_bits += bits; 1606 1607 bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN; 1608 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN)) 1609 return false; /* read_callback_ sets the state for us */ 1610 decoder->private_->stream_info.data.stream_info.min_framesize = x; 1611 used_bits += bits; 1612 1613 bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN; 1614 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN)) 1615 return false; /* read_callback_ sets the state for us */ 1616 decoder->private_->stream_info.data.stream_info.max_framesize = x; 1617 used_bits += bits; 1618 1619 bits = FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN; 1620 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN)) 1621 return false; /* read_callback_ sets the state for us */ 1622 decoder->private_->stream_info.data.stream_info.sample_rate = x; 1623 used_bits += bits; 1624 1625 bits = FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN; 1626 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN)) 1627 return false; /* read_callback_ sets the state for us */ 1628 decoder->private_->stream_info.data.stream_info.channels = x+1; 1629 used_bits += bits; 1630 1631 bits = FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN; 1632 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN)) 1633 return false; /* read_callback_ sets the state for us */ 1634 decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1; 1635 used_bits += bits; 1636 1637 bits = FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN; 1638 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)) 1639 return false; /* read_callback_ sets the state for us */ 1640 used_bits += bits; 1641 1642 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, decoder->private_->stream_info.data.stream_info.md5sum, 16)) 1643 return false; /* read_callback_ sets the state for us */ 1644 used_bits += 16*8; 1645 1646 /* skip the rest of the block */ 1647 FLAC__ASSERT(used_bits % 8 == 0); 1648 length -= (used_bits / 8); 1649 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length)) 1650 return false; /* read_callback_ sets the state for us */ 1651 1652 return true; 1653 } 1654 1655 FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length) 1656 { 1657 FLAC__uint32 i, x; 1658 FLAC__uint64 xx; 1659 1660 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1661 1662 decoder->private_->seek_table.type = FLAC__METADATA_TYPE_SEEKTABLE; 1663 decoder->private_->seek_table.is_last = is_last; 1664 decoder->private_->seek_table.length = length; 1665 1666 decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH; 1667 1668 /* use realloc since we may pass through here several times (e.g. after seeking) */ 1669 if(0 == (decoder->private_->seek_table.data.seek_table.points = 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)))) { 1670 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1671 return false; 1672 } 1673 for(i = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) { 1674 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN)) 1675 return false; /* read_callback_ sets the state for us */ 1676 decoder->private_->seek_table.data.seek_table.points[i].sample_number = xx; 1677 1678 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN)) 1679 return false; /* read_callback_ sets the state for us */ 1680 decoder->private_->seek_table.data.seek_table.points[i].stream_offset = xx; 1681 1682 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN)) 1683 return false; /* read_callback_ sets the state for us */ 1684 decoder->private_->seek_table.data.seek_table.points[i].frame_samples = x; 1685 } 1686 length -= (decoder->private_->seek_table.data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH); 1687 /* if there is a partial point left, skip over it */ 1688 if(length > 0) { 1689 /*@@@ do a send_error_to_client_() here? there's an argument for either way */ 1690 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length)) 1691 return false; /* read_callback_ sets the state for us */ 1692 } 1693 1694 return true; 1695 } 1696 1697 FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj, unsigned length) 1698 { 1699 FLAC__uint32 i; 1700 1701 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1702 1703 /* read vendor string */ 1704 if (length >= 8) { 1705 length -= 8; /* vendor string length + num comments entries alone take 8 bytes */ 1706 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32); 1707 if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->vendor_string.length)) 1708 return false; /* read_callback_ sets the state for us */ 1709 if (obj->vendor_string.length > 0) { 1710 if (length < obj->vendor_string.length) { 1711 obj->vendor_string.length = 0; 1712 obj->vendor_string.entry = 0; 1713 goto skip; 1714 } 1715 else 1716 length -= obj->vendor_string.length; 1717 if (0 == (obj->vendor_string.entry = safe_malloc_add_2op_(obj->vendor_string.length, /*+*/1))) { 1718 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1719 return false; 1720 } 1721 if (!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->vendor_string.entry, obj->vendor_string.length)) 1722 return false; /* read_callback_ sets the state for us */ 1723 obj->vendor_string.entry[obj->vendor_string.length] = '\0'; 1724 } 1725 else 1726 obj->vendor_string.entry = 0; 1727 1728 /* read num comments */ 1729 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN == 32); 1730 if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->num_comments)) 1731 return false; /* read_callback_ sets the state for us */ 1732 1733 /* read comments */ 1734 if (obj->num_comments > 100000) { 1735 /* Possibly malicious file. */ 1736 obj->num_comments = 0; 1737 return false; 1738 } 1739 if (obj->num_comments > 0) { 1740 if (0 == (obj->comments = safe_malloc_mul_2op_p(obj->num_comments, /*times*/sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) { 1741 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1742 return false; 1743 } 1744 for (i = 0; i < obj->num_comments; i++) { 1745 /* Initialize here just to make sure. */ 1746 obj->comments[i].length = 0; 1747 obj->comments[i].entry = 0; 1748 1749 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32); 1750 if (length < 4) { 1751 obj->num_comments = i; 1752 goto skip; 1753 } 1754 else 1755 length -= 4; 1756 if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->comments[i].length)) 1757 return false; /* read_callback_ sets the state for us */ 1758 if (obj->comments[i].length > 0) { 1759 if (length < obj->comments[i].length) { 1760 obj->num_comments = i; 1761 goto skip; 1762 } 1763 else 1764 length -= obj->comments[i].length; 1765 if (0 == (obj->comments[i].entry = safe_malloc_add_2op_(obj->comments[i].length, /*+*/1))) { 1766 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1767 return false; 1768 } 1769 memset (obj->comments[i].entry, 0, obj->comments[i].length) ; 1770 if (!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->comments[i].entry, obj->comments[i].length)) { 1771 obj->num_comments = i; 1772 goto skip; 1773 } 1774 obj->comments[i].entry[obj->comments[i].length] = '\0'; 1775 } 1776 else 1777 obj->comments[i].entry = 0; 1778 } 1779 } 1780 else 1781 obj->comments = 0; 1782 } 1783 1784 skip: 1785 if (length > 0) { 1786 /* This will only happen on files with invalid data in comments */ 1787 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length)) 1788 return false; /* read_callback_ sets the state for us */ 1789 } 1790 1791 return true; 1792 } 1793 1794 FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj) 1795 { 1796 FLAC__uint32 i, j, x; 1797 1798 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1799 1800 memset(obj, 0, sizeof(FLAC__StreamMetadata_CueSheet)); 1801 1802 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0); 1803 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)) 1804 return false; /* read_callback_ sets the state for us */ 1805 1806 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &obj->lead_in, FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN)) 1807 return false; /* read_callback_ sets the state for us */ 1808 1809 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN)) 1810 return false; /* read_callback_ sets the state for us */ 1811 obj->is_cd = x? true : false; 1812 1813 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN)) 1814 return false; /* read_callback_ sets the state for us */ 1815 1816 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN)) 1817 return false; /* read_callback_ sets the state for us */ 1818 obj->num_tracks = x; 1819 1820 if(obj->num_tracks > 0) { 1821 if(0 == (obj->tracks = safe_calloc_(obj->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track)))) { 1822 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1823 return false; 1824 } 1825 for(i = 0; i < obj->num_tracks; i++) { 1826 FLAC__StreamMetadata_CueSheet_Track *track = &obj->tracks[i]; 1827 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &track->offset, FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN)) 1828 return false; /* read_callback_ sets the state for us */ 1829 1830 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN)) 1831 return false; /* read_callback_ sets the state for us */ 1832 track->number = (FLAC__byte)x; 1833 1834 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0); 1835 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)track->isrc, FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN/8)) 1836 return false; /* read_callback_ sets the state for us */ 1837 1838 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN)) 1839 return false; /* read_callback_ sets the state for us */ 1840 track->type = x; 1841 1842 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN)) 1843 return false; /* read_callback_ sets the state for us */ 1844 track->pre_emphasis = x; 1845 1846 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN)) 1847 return false; /* read_callback_ sets the state for us */ 1848 1849 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN)) 1850 return false; /* read_callback_ sets the state for us */ 1851 track->num_indices = (FLAC__byte)x; 1852 1853 if(track->num_indices > 0) { 1854 if(0 == (track->indices = safe_calloc_(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index)))) { 1855 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1856 return false; 1857 } 1858 for(j = 0; j < track->num_indices; j++) { 1859 FLAC__StreamMetadata_CueSheet_Index *indx = &track->indices[j]; 1860 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &indx->offset, FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN)) 1861 return false; /* read_callback_ sets the state for us */ 1862 1863 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN)) 1864 return false; /* read_callback_ sets the state for us */ 1865 indx->number = (FLAC__byte)x; 1866 1867 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN)) 1868 return false; /* read_callback_ sets the state for us */ 1869 } 1870 } 1871 } 1872 } 1873 1874 return true; 1875 } 1876 1877 FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj) 1878 { 1879 FLAC__uint32 x; 1880 1881 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1882 1883 /* read type */ 1884 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_TYPE_LEN)) 1885 return false; /* read_callback_ sets the state for us */ 1886 obj->type = x; 1887 1888 /* read MIME type */ 1889 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN)) 1890 return false; /* read_callback_ sets the state for us */ 1891 if(0 == (obj->mime_type = safe_malloc_add_2op_(x, /*+*/1))) { 1892 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1893 return false; 1894 } 1895 if(x > 0) { 1896 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->mime_type, x)) 1897 return false; /* read_callback_ sets the state for us */ 1898 } 1899 obj->mime_type[x] = '\0'; 1900 1901 /* read description */ 1902 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN)) 1903 return false; /* read_callback_ sets the state for us */ 1904 if(0 == (obj->description = safe_malloc_add_2op_(x, /*+*/1))) { 1905 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1906 return false; 1907 } 1908 if(x > 0) { 1909 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->description, x)) 1910 return false; /* read_callback_ sets the state for us */ 1911 } 1912 obj->description[x] = '\0'; 1913 1914 /* read width */ 1915 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->width, FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN)) 1916 return false; /* read_callback_ sets the state for us */ 1917 1918 /* read height */ 1919 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->height, FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN)) 1920 return false; /* read_callback_ sets the state for us */ 1921 1922 /* read depth */ 1923 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->depth, FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN)) 1924 return false; /* read_callback_ sets the state for us */ 1925 1926 /* read colors */ 1927 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->colors, FLAC__STREAM_METADATA_PICTURE_COLORS_LEN)) 1928 return false; /* read_callback_ sets the state for us */ 1929 1930 /* read data */ 1931 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &(obj->data_length), FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN)) 1932 return false; /* read_callback_ sets the state for us */ 1933 if(0 == (obj->data = safe_malloc_(obj->data_length))) { 1934 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1935 return false; 1936 } 1937 if(obj->data_length > 0) { 1938 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->data, obj->data_length)) 1939 return false; /* read_callback_ sets the state for us */ 1940 } 1941 1942 return true; 1943 } 1944 1945 FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder) 1946 { 1947 FLAC__uint32 x; 1948 unsigned i, skip; 1949 1950 /* skip the version and flags bytes */ 1951 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 24)) 1952 return false; /* read_callback_ sets the state for us */ 1953 /* get the size (in bytes) to skip */ 1954 skip = 0; 1955 for(i = 0; i < 4; i++) { 1956 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 1957 return false; /* read_callback_ sets the state for us */ 1958 skip <<= 7; 1959 skip |= (x & 0x7f); 1960 } 1961 /* skip the rest of the tag */ 1962 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, skip)) 1963 return false; /* read_callback_ sets the state for us */ 1964 return true; 1965 } 1966 1967 FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder) 1968 { 1969 FLAC__uint32 x; 1970 FLAC__bool first = true; 1971 1972 /* If we know the total number of samples in the stream, stop if we've read that many. */ 1973 /* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */ 1974 if(FLAC__stream_decoder_get_total_samples(decoder) > 0) { 1975 if(decoder->private_->samples_decoded >= FLAC__stream_decoder_get_total_samples(decoder)) { 1976 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM; 1977 return true; 1978 } 1979 } 1980 1981 /* make sure we're byte aligned */ 1982 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) { 1983 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input))) 1984 return false; /* read_callback_ sets the state for us */ 1985 } 1986 1987 while(1) { 1988 if(decoder->private_->cached) { 1989 x = (FLAC__uint32)decoder->private_->lookahead; 1990 decoder->private_->cached = false; 1991 } 1992 else { 1993 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 1994 return false; /* read_callback_ sets the state for us */ 1995 } 1996 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */ 1997 decoder->private_->header_warmup[0] = (FLAC__byte)x; 1998 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 1999 return false; /* read_callback_ sets the state for us */ 2000 2001 /* 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 */ 2002 /* else we have to check if the second byte is the end of a sync code */ 2003 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */ 2004 decoder->private_->lookahead = (FLAC__byte)x; 2005 decoder->private_->cached = true; 2006 } 2007 else if(x >> 1 == 0x7c) { /* MAGIC NUMBER for the last 6 sync bits and reserved 7th bit */ 2008 decoder->private_->header_warmup[1] = (FLAC__byte)x; 2009 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME; 2010 return true; 2011 } 2012 } 2013 if(first) { 2014 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 2015 first = false; 2016 } 2017 } 2018 2019 return true; 2020 } 2021 2022 FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode) 2023 { 2024 unsigned channel; 2025 unsigned i; 2026 FLAC__int32 mid, side; 2027 unsigned frame_crc; /* the one we calculate from the input stream */ 2028 FLAC__uint32 x; 2029 2030 *got_a_frame = false; 2031 2032 /* init the CRC */ 2033 frame_crc = 0; 2034 frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc); 2035 frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc); 2036 FLAC__bitreader_reset_read_crc16(decoder->private_->input, (FLAC__uint16)frame_crc); 2037 2038 if(!read_frame_header_(decoder)) 2039 return false; 2040 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means we didn't sync on a valid header */ 2041 return true; 2042 if(!allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels)) 2043 return false; 2044 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) { 2045 /* 2046 * first figure the correct bits-per-sample of the subframe 2047 */ 2048 unsigned bps = decoder->private_->frame.header.bits_per_sample; 2049 switch(decoder->private_->frame.header.channel_assignment) { 2050 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT: 2051 /* no adjustment needed */ 2052 break; 2053 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE: 2054 FLAC__ASSERT(decoder->private_->frame.header.channels == 2); 2055 if(channel == 1) 2056 bps++; 2057 break; 2058 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE: 2059 FLAC__ASSERT(decoder->private_->frame.header.channels == 2); 2060 if(channel == 0) 2061 bps++; 2062 break; 2063 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE: 2064 FLAC__ASSERT(decoder->private_->frame.header.channels == 2); 2065 if(channel == 1) 2066 bps++; 2067 break; 2068 default: 2069 FLAC__ASSERT(0); 2070 } 2071 /* 2072 * now read it 2073 */ 2074 if(!read_subframe_(decoder, channel, bps, do_full_decode)) 2075 return false; 2076 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */ 2077 return true; 2078 } 2079 if(!read_zero_padding_(decoder)) 2080 return false; 2081 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) */ 2082 return true; 2083 2084 /* 2085 * Read the frame CRC-16 from the footer and check 2086 */ 2087 frame_crc = FLAC__bitreader_get_read_crc16(decoder->private_->input); 2088 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN)) 2089 return false; /* read_callback_ sets the state for us */ 2090 if(frame_crc == x) { 2091 if(do_full_decode) { 2092 /* Undo any special channel coding */ 2093 switch(decoder->private_->frame.header.channel_assignment) { 2094 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT: 2095 /* do nothing */ 2096 break; 2097 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE: 2098 FLAC__ASSERT(decoder->private_->frame.header.channels == 2); 2099 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) 2100 decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i]; 2101 break; 2102 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE: 2103 FLAC__ASSERT(decoder->private_->frame.header.channels == 2); 2104 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) 2105 decoder->private_->output[0][i] += decoder->private_->output[1][i]; 2106 break; 2107 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE: 2108 FLAC__ASSERT(decoder->private_->frame.header.channels == 2); 2109 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) { 2110 #if 1 2111 mid = decoder->private_->output[0][i]; 2112 side = decoder->private_->output[1][i]; 2113 mid <<= 1; 2114 mid |= (side & 1); /* i.e. if 'side' is odd... */ 2115 decoder->private_->output[0][i] = (mid + side) >> 1; 2116 decoder->private_->output[1][i] = (mid - side) >> 1; 2117 #else 2118 /* OPT: without 'side' temp variable */ 2119 mid = (decoder->private_->output[0][i] << 1) | (decoder->private_->output[1][i] & 1); /* i.e. if 'side' is odd... */ 2120 decoder->private_->output[0][i] = (mid + decoder->private_->output[1][i]) >> 1; 2121 decoder->private_->output[1][i] = (mid - decoder->private_->output[1][i]) >> 1; 2122 #endif 2123 } 2124 break; 2125 default: 2126 FLAC__ASSERT(0); 2127 break; 2128 } 2129 } 2130 } 2131 else { 2132 /* Bad frame, emit error and zero the output signal */ 2133 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH); 2134 if(do_full_decode) { 2135 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) { 2136 memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize); 2137 } 2138 } 2139 } 2140 2141 *got_a_frame = true; 2142 2143 /* we wait to update fixed_block_size until here, when we're sure we've got a proper frame and hence a correct blocksize */ 2144 if(decoder->private_->next_fixed_block_size) 2145 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size; 2146 2147 /* put the latest values into the public section of the decoder instance */ 2148 decoder->protected_->channels = decoder->private_->frame.header.channels; 2149 decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment; 2150 decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample; 2151 decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate; 2152 decoder->protected_->blocksize = decoder->private_->frame.header.blocksize; 2153 2154 FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); 2155 decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize; 2156 2157 /* write it */ 2158 if(do_full_decode) { 2159 if(write_audio_frame_to_client_(decoder, &decoder->private_->frame, (const FLAC__int32 * const *)decoder->private_->output) != FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE) 2160 return false; 2161 } 2162 2163 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2164 return true; 2165 } 2166 2167 FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder) 2168 { 2169 FLAC__uint32 x; 2170 FLAC__uint64 xx; 2171 unsigned i, blocksize_hint = 0, sample_rate_hint = 0; 2172 FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */ 2173 unsigned raw_header_len; 2174 FLAC__bool is_unparseable = false; 2175 2176 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 2177 2178 /* init the raw header with the saved bits from synchronization */ 2179 raw_header[0] = decoder->private_->header_warmup[0]; 2180 raw_header[1] = decoder->private_->header_warmup[1]; 2181 raw_header_len = 2; 2182 2183 /* check to make sure that reserved bit is 0 */ 2184 if(raw_header[1] & 0x02) /* MAGIC NUMBER */ 2185 is_unparseable = true; 2186 2187 /* 2188 * Note that along the way as we read the header, we look for a sync 2189 * code inside. If we find one it would indicate that our original 2190 * sync was bad since there cannot be a sync code in a valid header. 2191 * 2192 * Three kinds of things can go wrong when reading the frame header: 2193 * 1) We may have sync'ed incorrectly and not landed on a frame header. 2194 * If we don't find a sync code, it can end up looking like we read 2195 * a valid but unparseable header, until getting to the frame header 2196 * CRC. Even then we could get a false positive on the CRC. 2197 * 2) We may have sync'ed correctly but on an unparseable frame (from a 2198 * future encoder). 2199 * 3) We may be on a damaged frame which appears valid but unparseable. 2200 * 2201 * For all these reasons, we try and read a complete frame header as 2202 * long as it seems valid, even if unparseable, up until the frame 2203 * header CRC. 2204 */ 2205 2206 /* 2207 * read in the raw header as bytes so we can CRC it, and parse it on the way 2208 */ 2209 for(i = 0; i < 2; i++) { 2210 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 2211 return false; /* read_callback_ sets the state for us */ 2212 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */ 2213 /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */ 2214 decoder->private_->lookahead = (FLAC__byte)x; 2215 decoder->private_->cached = true; 2216 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER); 2217 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2218 return true; 2219 } 2220 raw_header[raw_header_len++] = (FLAC__byte)x; 2221 } 2222 2223 switch(x = raw_header[2] >> 4) { 2224 case 0: 2225 is_unparseable = true; 2226 break; 2227 case 1: 2228 decoder->private_->frame.header.blocksize = 192; 2229 break; 2230 case 2: 2231 case 3: 2232 case 4: 2233 case 5: 2234 decoder->private_->frame.header.blocksize = 576 << (x-2); 2235 break; 2236 case 6: 2237 case 7: 2238 blocksize_hint = x; 2239 break; 2240 case 8: 2241 case 9: 2242 case 10: 2243 case 11: 2244 case 12: 2245 case 13: 2246 case 14: 2247 case 15: 2248 decoder->private_->frame.header.blocksize = 256 << (x-8); 2249 break; 2250 default: 2251 FLAC__ASSERT(0); 2252 break; 2253 } 2254 2255 switch(x = raw_header[2] & 0x0f) { 2256 case 0: 2257 if(decoder->private_->has_stream_info) 2258 decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate; 2259 else 2260 is_unparseable = true; 2261 break; 2262 case 1: 2263 decoder->private_->frame.header.sample_rate = 88200; 2264 break; 2265 case 2: 2266 decoder->private_->frame.header.sample_rate = 176400; 2267 break; 2268 case 3: 2269 decoder->private_->frame.header.sample_rate = 192000; 2270 break; 2271 case 4: 2272 decoder->private_->frame.header.sample_rate = 8000; 2273 break; 2274 case 5: 2275 decoder->private_->frame.header.sample_rate = 16000; 2276 break; 2277 case 6: 2278 decoder->private_->frame.header.sample_rate = 22050; 2279 break; 2280 case 7: 2281 decoder->private_->frame.header.sample_rate = 24000; 2282 break; 2283 case 8: 2284 decoder->private_->frame.header.sample_rate = 32000; 2285 break; 2286 case 9: 2287 decoder->private_->frame.header.sample_rate = 44100; 2288 break; 2289 case 10: 2290 decoder->private_->frame.header.sample_rate = 48000; 2291 break; 2292 case 11: 2293 decoder->private_->frame.header.sample_rate = 96000; 2294 break; 2295 case 12: 2296 case 13: 2297 case 14: 2298 sample_rate_hint = x; 2299 break; 2300 case 15: 2301 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER); 2302 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2303 return true; 2304 default: 2305 FLAC__ASSERT(0); 2306 } 2307 2308 x = (unsigned)(raw_header[3] >> 4); 2309 if(x & 8) { 2310 decoder->private_->frame.header.channels = 2; 2311 switch(x & 7) { 2312 case 0: 2313 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE; 2314 break; 2315 case 1: 2316 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE; 2317 break; 2318 case 2: 2319 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE; 2320 break; 2321 default: 2322 is_unparseable = true; 2323 break; 2324 } 2325 } 2326 else { 2327 decoder->private_->frame.header.channels = (unsigned)x + 1; 2328 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT; 2329 } 2330 2331 switch(x = (unsigned)(raw_header[3] & 0x0e) >> 1) { 2332 case 0: 2333 if(decoder->private_->has_stream_info) 2334 decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample; 2335 else 2336 is_unparseable = true; 2337 break; 2338 case 1: 2339 decoder->private_->frame.header.bits_per_sample = 8; 2340 break; 2341 case 2: 2342 decoder->private_->frame.header.bits_per_sample = 12; 2343 break; 2344 case 4: 2345 decoder->private_->frame.header.bits_per_sample = 16; 2346 break; 2347 case 5: 2348 decoder->private_->frame.header.bits_per_sample = 20; 2349 break; 2350 case 6: 2351 decoder->private_->frame.header.bits_per_sample = 24; 2352 break; 2353 case 3: 2354 case 7: 2355 is_unparseable = true; 2356 break; 2357 default: 2358 FLAC__ASSERT(0); 2359 break; 2360 } 2361 2362 /* check to make sure that reserved bit is 0 */ 2363 if(raw_header[3] & 0x01) /* MAGIC NUMBER */ 2364 is_unparseable = true; 2365 2366 /* read the frame's starting sample number (or frame number as the case may be) */ 2367 if( 2368 raw_header[1] & 0x01 || 2369 /*@@@ 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 */ 2370 (decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.min_blocksize != decoder->private_->stream_info.data.stream_info.max_blocksize) 2371 ) { /* variable blocksize */ 2372 if(!FLAC__bitreader_read_utf8_uint64(decoder->private_->input, &xx, raw_header, &raw_header_len)) 2373 return false; /* read_callback_ sets the state for us */ 2374 if(xx == FLAC__U64L(0xffffffffffffffff)) { /* i.e. non-UTF8 code... */ 2375 decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */ 2376 decoder->private_->cached = true; 2377 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER); 2378 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2379 return true; 2380 } 2381 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER; 2382 decoder->private_->frame.header.number.sample_number = xx; 2383 } 2384 else { /* fixed blocksize */ 2385 if(!FLAC__bitreader_read_utf8_uint32(decoder->private_->input, &x, raw_header, &raw_header_len)) 2386 return false; /* read_callback_ sets the state for us */ 2387 if(x == 0xffffffff) { /* i.e. non-UTF8 code... */ 2388 decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */ 2389 decoder->private_->cached = true; 2390 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER); 2391 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2392 return true; 2393 } 2394 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER; 2395 decoder->private_->frame.header.number.frame_number = x; 2396 } 2397 2398 if(blocksize_hint) { 2399 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 2400 return false; /* read_callback_ sets the state for us */ 2401 raw_header[raw_header_len++] = (FLAC__byte)x; 2402 if(blocksize_hint == 7) { 2403 FLAC__uint32 _x; 2404 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8)) 2405 return false; /* read_callback_ sets the state for us */ 2406 raw_header[raw_header_len++] = (FLAC__byte)_x; 2407 x = (x << 8) | _x; 2408 } 2409 decoder->private_->frame.header.blocksize = x+1; 2410 } 2411 2412 if(sample_rate_hint) { 2413 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 2414 return false; /* read_callback_ sets the state for us */ 2415 raw_header[raw_header_len++] = (FLAC__byte)x; 2416 if(sample_rate_hint != 12) { 2417 FLAC__uint32 _x; 2418 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8)) 2419 return false; /* read_callback_ sets the state for us */ 2420 raw_header[raw_header_len++] = (FLAC__byte)_x; 2421 x = (x << 8) | _x; 2422 } 2423 if(sample_rate_hint == 12) 2424 decoder->private_->frame.header.sample_rate = x*1000; 2425 else if(sample_rate_hint == 13) 2426 decoder->private_->frame.header.sample_rate = x; 2427 else 2428 decoder->private_->frame.header.sample_rate = x*10; 2429 } 2430 2431 /* read the CRC-8 byte */ 2432 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 2433 return false; /* read_callback_ sets the state for us */ 2434 crc8 = (FLAC__byte)x; 2435 2436 if(FLAC__crc8(raw_header, raw_header_len) != crc8) { 2437 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER); 2438 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2439 return true; 2440 } 2441 2442 /* calculate the sample number from the frame number if needed */ 2443 decoder->private_->next_fixed_block_size = 0; 2444 if(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER) { 2445 x = decoder->private_->frame.header.number.frame_number; 2446 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER; 2447 if(decoder->private_->fixed_block_size) 2448 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->fixed_block_size * (FLAC__uint64)x; 2449 else if(decoder->private_->has_stream_info) { 2450 if(decoder->private_->stream_info.data.stream_info.min_blocksize == decoder->private_->stream_info.data.stream_info.max_blocksize) { 2451 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__uint64)x; 2452 decoder->private_->next_fixed_block_size = decoder->private_->stream_info.data.stream_info.max_blocksize; 2453 } 2454 else 2455 is_unparseable = true; 2456 } 2457 else if(x == 0) { 2458 decoder->private_->frame.header.number.sample_number = 0; 2459 decoder->private_->next_fixed_block_size = decoder->private_->frame.header.blocksize; 2460 } 2461 else { 2462 /* can only get here if the stream has invalid frame numbering and no STREAMINFO, so assume it's not the last (possibly short) frame */ 2463 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->frame.header.blocksize * (FLAC__uint64)x; 2464 } 2465 } 2466 2467 if(is_unparseable) { 2468 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM); 2469 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2470 return true; 2471 } 2472 2473 return true; 2474 } 2475 2476 FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode) 2477 { 2478 FLAC__uint32 x; 2479 FLAC__bool wasted_bits; 2480 unsigned i; 2481 2482 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) /* MAGIC NUMBER */ 2483 return false; /* read_callback_ sets the state for us */ 2484 2485 wasted_bits = (x & 1); 2486 x &= 0xfe; 2487 2488 if(wasted_bits) { 2489 unsigned u; 2490 if(!FLAC__bitreader_read_unary_unsigned(decoder->private_->input, &u)) 2491 return false; /* read_callback_ sets the state for us */ 2492 decoder->private_->frame.subframes[channel].wasted_bits = u+1; 2493 bps -= decoder->private_->frame.subframes[channel].wasted_bits; 2494 } 2495 else 2496 decoder->private_->frame.subframes[channel].wasted_bits = 0; 2497 2498 /* 2499 * Lots of magic numbers here 2500 */ 2501 if(x & 0x80) { 2502 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 2503 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2504 return true; 2505 } 2506 else if(x == 0) { 2507 if(!read_subframe_constant_(decoder, channel, bps, do_full_decode)) 2508 return false; 2509 } 2510 else if(x == 2) { 2511 if(!read_subframe_verbatim_(decoder, channel, bps, do_full_decode)) 2512 return false; 2513 } 2514 else if(x < 16) { 2515 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM); 2516 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2517 return true; 2518 } 2519 else if(x <= 24) { 2520 if(!read_subframe_fixed_(decoder, channel, bps, (x>>1)&7, do_full_decode)) 2521 return false; 2522 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */ 2523 return true; 2524 } 2525 else if(x < 64) { 2526 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM); 2527 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2528 return true; 2529 } 2530 else { 2531 if(!read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1, do_full_decode)) 2532 return false; 2533 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */ 2534 return true; 2535 } 2536 2537 if(wasted_bits && do_full_decode) { 2538 x = decoder->private_->frame.subframes[channel].wasted_bits; 2539 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) 2540 decoder->private_->output[channel][i] <<= x; 2541 } 2542 2543 return true; 2544 } 2545 2546 FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode) 2547 { 2548 FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant; 2549 FLAC__int32 x; 2550 unsigned i; 2551 FLAC__int32 *output = decoder->private_->output[channel]; 2552 2553 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT; 2554 2555 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps)) 2556 return false; /* read_callback_ sets the state for us */ 2557 2558 subframe->value = x; 2559 2560 /* decode the subframe */ 2561 if(do_full_decode) { 2562 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) 2563 output[i] = x; 2564 } 2565 2566 return true; 2567 } 2568 2569 FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode) 2570 { 2571 FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed; 2572 FLAC__int32 i32; 2573 FLAC__uint32 u32; 2574 unsigned u; 2575 2576 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED; 2577 2578 subframe->residual = decoder->private_->residual[channel]; 2579 subframe->order = order; 2580 2581 /* read warm-up samples */ 2582 for(u = 0; u < order; u++) { 2583 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps)) 2584 return false; /* read_callback_ sets the state for us */ 2585 subframe->warmup[u] = i32; 2586 } 2587 2588 /* read entropy coding method info */ 2589 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN)) 2590 return false; /* read_callback_ sets the state for us */ 2591 subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32; 2592 switch(subframe->entropy_coding_method.type) { 2593 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE: 2594 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2: 2595 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN)) 2596 return false; /* read_callback_ sets the state for us */ 2597 subframe->entropy_coding_method.data.partitioned_rice.order = u32; 2598 subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel]; 2599 break; 2600 default: 2601 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM); 2602 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2603 return true; 2604 } 2605 2606 /* read residual */ 2607 switch(subframe->entropy_coding_method.type) { 2608 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE: 2609 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2: 2610 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)) 2611 return false; 2612 break; 2613 default: 2614 FLAC__ASSERT(0); 2615 } 2616 2617 /* decode the subframe */ 2618 if(do_full_decode) { 2619 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order); 2620 FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order); 2621 } 2622 2623 return true; 2624 } 2625 2626 FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode) 2627 { 2628 FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc; 2629 FLAC__int32 i32; 2630 FLAC__uint32 u32; 2631 unsigned u; 2632 2633 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC; 2634 2635 subframe->residual = decoder->private_->residual[channel]; 2636 subframe->order = order; 2637 2638 /* read warm-up samples */ 2639 for(u = 0; u < order; u++) { 2640 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps)) 2641 return false; /* read_callback_ sets the state for us */ 2642 subframe->warmup[u] = i32; 2643 } 2644 2645 /* read qlp coeff precision */ 2646 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN)) 2647 return false; /* read_callback_ sets the state for us */ 2648 if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) { 2649 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 2650 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2651 return true; 2652 } 2653 subframe->qlp_coeff_precision = u32+1; 2654 2655 /* read qlp shift */ 2656 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN)) 2657 return false; /* read_callback_ sets the state for us */ 2658 subframe->quantization_level = i32; 2659 2660 /* read quantized lp coefficiencts */ 2661 for(u = 0; u < order; u++) { 2662 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision)) 2663 return false; /* read_callback_ sets the state for us */ 2664 subframe->qlp_coeff[u] = i32; 2665 } 2666 2667 /* read entropy coding method info */ 2668 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN)) 2669 return false; /* read_callback_ sets the state for us */ 2670 subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32; 2671 switch(subframe->entropy_coding_method.type) { 2672 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE: 2673 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2: 2674 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN)) 2675 return false; /* read_callback_ sets the state for us */ 2676 subframe->entropy_coding_method.data.partitioned_rice.order = u32; 2677 subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel]; 2678 break; 2679 default: 2680 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM); 2681 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2682 return true; 2683 } 2684 2685 /* read residual */ 2686 switch(subframe->entropy_coding_method.type) { 2687 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE: 2688 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2: 2689 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)) 2690 return false; 2691 break; 2692 default: 2693 FLAC__ASSERT(0); 2694 } 2695 2696 /* decode the subframe */ 2697 if(do_full_decode) { 2698 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order); 2699 /*@@@@@@ technically not pessimistic enough, should be more like 2700 if( (FLAC__uint64)order * ((((FLAC__uint64)1)<<bps)-1) * ((1<<subframe->qlp_coeff_precision)-1) < (((FLAC__uint64)-1) << 32) ) 2701 */ 2702 if(bps + subframe->qlp_coeff_precision + FLAC__bitmath_ilog2(order) <= 32) 2703 if(bps <= 16 && subframe->qlp_coeff_precision <= 16) 2704 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); 2705 else 2706 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); 2707 else 2708 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); 2709 } 2710 2711 return true; 2712 } 2713 2714 FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode) 2715 { 2716 FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim; 2717 FLAC__int32 x, *residual = decoder->private_->residual[channel]; 2718 unsigned i; 2719 2720 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM; 2721 2722 subframe->data = residual; 2723 2724 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) { 2725 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps)) 2726 return false; /* read_callback_ sets the state for us */ 2727 residual[i] = x; 2728 } 2729 2730 /* decode the subframe */ 2731 if(do_full_decode) 2732 memcpy(decoder->private_->output[channel], subframe->data, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize); 2733 2734 return true; 2735 } 2736 2737 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) 2738 { 2739 FLAC__uint32 rice_parameter; 2740 int i; 2741 unsigned partition, sample, u; 2742 const unsigned partitions = 1u << partition_order; 2743 const unsigned partition_samples = partition_order > 0? decoder->private_->frame.header.blocksize >> partition_order : decoder->private_->frame.header.blocksize - predictor_order; 2744 const unsigned plen = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_PARAMETER_LEN : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN; 2745 const unsigned pesc = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_ESCAPE_PARAMETER : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER; 2746 2747 /* sanity checks */ 2748 if(partition_order == 0) { 2749 if(decoder->private_->frame.header.blocksize < predictor_order) { 2750 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 2751 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2752 return true; 2753 } 2754 } 2755 else { 2756 if(partition_samples < predictor_order) { 2757 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 2758 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2759 return true; 2760 } 2761 } 2762 2763 if(!FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(partitioned_rice_contents, flac_max(6u, partition_order))) { 2764 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 2765 return false; 2766 } 2767 2768 sample = 0; 2769 for(partition = 0; partition < partitions; partition++) { 2770 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, plen)) 2771 return false; /* read_callback_ sets the state for us */ 2772 partitioned_rice_contents->parameters[partition] = rice_parameter; 2773 if(rice_parameter < pesc) { 2774 partitioned_rice_contents->raw_bits[partition] = 0; 2775 u = (partition_order == 0 || partition > 0)? partition_samples : partition_samples - predictor_order; 2776 if(!FLAC__bitreader_read_rice_signed_block(decoder->private_->input, residual + sample, u, rice_parameter)) 2777 return false; /* read_callback_ sets the state for us */ 2778 sample += u; 2779 } 2780 else { 2781 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN)) 2782 return false; /* read_callback_ sets the state for us */ 2783 partitioned_rice_contents->raw_bits[partition] = rice_parameter; 2784 for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) { 2785 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i, rice_parameter)) 2786 return false; /* read_callback_ sets the state for us */ 2787 residual[sample] = i; 2788 } 2789 } 2790 } 2791 2792 return true; 2793 } 2794 2795 FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder) 2796 { 2797 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) { 2798 FLAC__uint32 zero = 0; 2799 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &zero, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input))) 2800 return false; /* read_callback_ sets the state for us */ 2801 if(zero != 0) { 2802 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 2803 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2804 } 2805 } 2806 return true; 2807 } 2808 2809 FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data) 2810 { 2811 FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data; 2812 2813 if( 2814 #if FLAC__HAS_OGG 2815 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */ 2816 !decoder->private_->is_ogg && 2817 #endif 2818 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data) 2819 ) { 2820 *bytes = 0; 2821 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM; 2822 return false; 2823 } 2824 else if(*bytes > 0) { 2825 /* While seeking, it is possible for our seek to land in the 2826 * middle of audio data that looks exactly like a frame header 2827 * from a future version of an encoder. When that happens, our 2828 * error callback will get an 2829 * FLAC__STREAM_DECODER_UNPARSEABLE_STREAM and increment its 2830 * unparseable_frame_count. But there is a remote possibility 2831 * that it is properly synced at such a "future-codec frame", 2832 * so to make sure, we wait to see many "unparseable" errors in 2833 * a row before bailing out. 2834 */ 2835 if(decoder->private_->is_seeking && decoder->private_->unparseable_frame_count > 20) { 2836 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED; 2837 return false; 2838 } 2839 else { 2840 const FLAC__StreamDecoderReadStatus status = 2841 #if FLAC__HAS_OGG 2842 decoder->private_->is_ogg? 2843 read_callback_ogg_aspect_(decoder, buffer, bytes) : 2844 #endif 2845 decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data) 2846 ; 2847 if(status == FLAC__STREAM_DECODER_READ_STATUS_ABORT) { 2848 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED; 2849 return false; 2850 } 2851 else if(*bytes == 0) { 2852 if( 2853 status == FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM || 2854 ( 2855 #if FLAC__HAS_OGG 2856 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */ 2857 !decoder->private_->is_ogg && 2858 #endif 2859 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data) 2860 ) 2861 ) { 2862 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM; 2863 return false; 2864 } 2865 else 2866 return true; 2867 } 2868 else 2869 return true; 2870 } 2871 } 2872 else { 2873 /* abort to avoid a deadlock */ 2874 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED; 2875 return false; 2876 } 2877 /* [1] @@@ HACK NOTE: The end-of-stream checking has to be hacked around 2878 * for Ogg FLAC. This is because the ogg decoder aspect can lose sync 2879 * and at the same time hit the end of the stream (for example, seeking 2880 * to a point that is after the beginning of the last Ogg page). There 2881 * is no way to report an Ogg sync loss through the callbacks (see note 2882 * in read_callback_ogg_aspect_()) so it returns CONTINUE with *bytes==0. 2883 * So to keep the decoder from stopping at this point we gate the call 2884 * to the eof_callback and let the Ogg decoder aspect set the 2885 * end-of-stream state when it is needed. 2886 */ 2887 } 2888 2889 #if FLAC__HAS_OGG 2890 FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes) 2891 { 2892 switch(FLAC__ogg_decoder_aspect_read_callback_wrapper(&decoder->protected_->ogg_decoder_aspect, buffer, bytes, read_callback_proxy_, decoder, decoder->private_->client_data)) { 2893 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK: 2894 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE; 2895 /* we don't really have a way to handle lost sync via read 2896 * callback so we'll let it pass and let the underlying 2897 * FLAC decoder catch the error 2898 */ 2899 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_LOST_SYNC: 2900 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE; 2901 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM: 2902 return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM; 2903 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_NOT_FLAC: 2904 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_UNSUPPORTED_MAPPING_VERSION: 2905 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT: 2906 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ERROR: 2907 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_MEMORY_ALLOCATION_ERROR: 2908 return FLAC__STREAM_DECODER_READ_STATUS_ABORT; 2909 default: 2910 FLAC__ASSERT(0); 2911 /* double protection */ 2912 return FLAC__STREAM_DECODER_READ_STATUS_ABORT; 2913 } 2914 } 2915 2916 FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data) 2917 { 2918 FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder*)void_decoder; 2919 2920 switch(decoder->private_->read_callback(decoder, buffer, bytes, client_data)) { 2921 case FLAC__STREAM_DECODER_READ_STATUS_CONTINUE: 2922 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK; 2923 case FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM: 2924 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM; 2925 case FLAC__STREAM_DECODER_READ_STATUS_ABORT: 2926 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT; 2927 default: 2928 /* double protection: */ 2929 FLAC__ASSERT(0); 2930 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT; 2931 } 2932 } 2933 #endif 2934 2935 FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[]) 2936 { 2937 if(decoder->private_->is_seeking) { 2938 FLAC__uint64 this_frame_sample = frame->header.number.sample_number; 2939 FLAC__uint64 next_frame_sample = this_frame_sample + (FLAC__uint64)frame->header.blocksize; 2940 FLAC__uint64 target_sample = decoder->private_->target_sample; 2941 2942 FLAC__ASSERT(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); 2943 2944 #if FLAC__HAS_OGG 2945 decoder->private_->got_a_frame = true; 2946 #endif 2947 decoder->private_->last_frame = *frame; /* save the frame */ 2948 if(this_frame_sample <= target_sample && target_sample < next_frame_sample) { /* we hit our target frame */ 2949 unsigned delta = (unsigned)(target_sample - this_frame_sample); 2950 /* kick out of seek mode */ 2951 decoder->private_->is_seeking = false; 2952 /* shift out the samples before target_sample */ 2953 if(delta > 0) { 2954 unsigned channel; 2955 const FLAC__int32 *newbuffer[FLAC__MAX_CHANNELS]; 2956 for(channel = 0; channel < frame->header.channels; channel++) 2957 newbuffer[channel] = buffer[channel] + delta; 2958 decoder->private_->last_frame.header.blocksize -= delta; 2959 decoder->private_->last_frame.header.number.sample_number += (FLAC__uint64)delta; 2960 /* write the relevant samples */ 2961 return decoder->private_->write_callback(decoder, &decoder->private_->last_frame, newbuffer, decoder->private_->client_data); 2962 } 2963 else { 2964 /* write the relevant samples */ 2965 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data); 2966 } 2967 } 2968 else { 2969 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; 2970 } 2971 } 2972 else { 2973 /* 2974 * If we never got STREAMINFO, turn off MD5 checking to save 2975 * cycles since we don't have a sum to compare to anyway 2976 */ 2977 if(!decoder->private_->has_stream_info) 2978 decoder->private_->do_md5_checking = false; 2979 if(decoder->private_->do_md5_checking) { 2980 if(!FLAC__MD5Accumulate(&decoder->private_->md5context, buffer, frame->header.channels, frame->header.blocksize, (frame->header.bits_per_sample+7) / 8)) 2981 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; 2982 } 2983 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data); 2984 } 2985 } 2986 2987 void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status) 2988 { 2989 if(!decoder->private_->is_seeking) 2990 decoder->private_->error_callback(decoder, status, decoder->private_->client_data); 2991 else if(status == FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM) 2992 decoder->private_->unparseable_frame_count++; 2993 } 2994 2995 FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample) 2996 { 2997 FLAC__uint64 first_frame_offset = decoder->private_->first_frame_offset, lower_bound, upper_bound, lower_bound_sample, upper_bound_sample, this_frame_sample; 2998 FLAC__int64 pos = -1; 2999 int i; 3000 unsigned approx_bytes_per_frame; 3001 FLAC__bool first_seek = true; 3002 const FLAC__uint64 total_samples = FLAC__stream_decoder_get_total_samples(decoder); 3003 const unsigned min_blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize; 3004 const unsigned max_blocksize = decoder->private_->stream_info.data.stream_info.max_blocksize; 3005 const unsigned max_framesize = decoder->private_->stream_info.data.stream_info.max_framesize; 3006 const unsigned min_framesize = decoder->private_->stream_info.data.stream_info.min_framesize; 3007 /* take these from the current frame in case they've changed mid-stream */ 3008 unsigned channels = FLAC__stream_decoder_get_channels(decoder); 3009 unsigned bps = FLAC__stream_decoder_get_bits_per_sample(decoder); 3010 const FLAC__StreamMetadata_SeekTable *seek_table = decoder->private_->has_seek_table? &decoder->private_->seek_table.data.seek_table : 0; 3011 3012 /* use values from stream info if we didn't decode a frame */ 3013 if(channels == 0) 3014 channels = decoder->private_->stream_info.data.stream_info.channels; 3015 if(bps == 0) 3016 bps = decoder->private_->stream_info.data.stream_info.bits_per_sample; 3017 3018 /* we are just guessing here */ 3019 if(max_framesize > 0) 3020 approx_bytes_per_frame = (max_framesize + min_framesize) / 2 + 1; 3021 /* 3022 * Check if it's a known fixed-blocksize stream. Note that though 3023 * the spec doesn't allow zeroes in the STREAMINFO block, we may 3024 * never get a STREAMINFO block when decoding so the value of 3025 * min_blocksize might be zero. 3026 */ 3027 else if(min_blocksize == max_blocksize && min_blocksize > 0) { 3028 /* note there are no () around 'bps/8' to keep precision up since it's an integer calulation */ 3029 approx_bytes_per_frame = min_blocksize * channels * bps/8 + 64; 3030 } 3031 else 3032 approx_bytes_per_frame = 4096 * channels * bps/8 + 64; 3033 3034 /* 3035 * First, we set an upper and lower bound on where in the 3036 * stream we will search. For now we assume the worst case 3037 * scenario, which is our best guess at the beginning of 3038 * the first frame and end of the stream. 3039 */ 3040 lower_bound = first_frame_offset; 3041 lower_bound_sample = 0; 3042 upper_bound = stream_length; 3043 upper_bound_sample = total_samples > 0 ? total_samples : target_sample /*estimate it*/; 3044 3045 /* 3046 * Now we refine the bounds if we have a seektable with 3047 * suitable points. Note that according to the spec they 3048 * must be ordered by ascending sample number. 3049 * 3050 * Note: to protect against invalid seek tables we will ignore points 3051 * that have frame_samples==0 or sample_number>=total_samples 3052 */ 3053 if(seek_table) { 3054 FLAC__uint64 new_lower_bound = lower_bound; 3055 FLAC__uint64 new_upper_bound = upper_bound; 3056 FLAC__uint64 new_lower_bound_sample = lower_bound_sample; 3057 FLAC__uint64 new_upper_bound_sample = upper_bound_sample; 3058 3059 /* find the closest seek point <= target_sample, if it exists */ 3060 for(i = (int)seek_table->num_points - 1; i >= 0; i--) { 3061 if( 3062 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER && 3063 seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */ 3064 (total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */ 3065 seek_table->points[i].sample_number <= target_sample 3066 ) 3067 break; 3068 } 3069 if(i >= 0) { /* i.e. we found a suitable seek point... */ 3070 new_lower_bound = first_frame_offset + seek_table->points[i].stream_offset; 3071 new_lower_bound_sample = seek_table->points[i].sample_number; 3072 } 3073 3074 /* find the closest seek point > target_sample, if it exists */ 3075 for(i = 0; i < (int)seek_table->num_points; i++) { 3076 if( 3077 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER && 3078 seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */ 3079 (total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */ 3080 seek_table->points[i].sample_number > target_sample 3081 ) 3082 break; 3083 } 3084 if(i < (int)seek_table->num_points) { /* i.e. we found a suitable seek point... */ 3085 new_upper_bound = first_frame_offset + seek_table->points[i].stream_offset; 3086 new_upper_bound_sample = seek_table->points[i].sample_number; 3087 } 3088 /* final protection against unsorted seek tables; keep original values if bogus */ 3089 if(new_upper_bound >= new_lower_bound) { 3090 lower_bound = new_lower_bound; 3091 upper_bound = new_upper_bound; 3092 lower_bound_sample = new_lower_bound_sample; 3093 upper_bound_sample = new_upper_bound_sample; 3094 } 3095 } 3096 3097 FLAC__ASSERT(upper_bound_sample >= lower_bound_sample); 3098 /* there are 2 insidious ways that the following equality occurs, which 3099 * we need to fix: 3100 * 1) total_samples is 0 (unknown) and target_sample is 0 3101 * 2) total_samples is 0 (unknown) and target_sample happens to be 3102 * exactly equal to the last seek point in the seek table; this 3103 * means there is no seek point above it, and upper_bound_samples 3104 * remains equal to the estimate (of target_samples) we made above 3105 * in either case it does not hurt to move upper_bound_sample up by 1 3106 */ 3107 if(upper_bound_sample == lower_bound_sample) 3108 upper_bound_sample++; 3109 3110 decoder->private_->target_sample = target_sample; 3111 while(1) { 3112 /* check if the bounds are still ok */ 3113 if (lower_bound_sample >= upper_bound_sample || lower_bound > upper_bound) { 3114 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3115 return false; 3116 } 3117 #ifndef FLAC__INTEGER_ONLY_LIBRARY 3118 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; 3119 #else 3120 /* a little less accurate: */ 3121 if(upper_bound - lower_bound < 0xffffffff) 3122 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; 3123 else /* @@@ WATCHOUT, ~2TB limit */ 3124 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; 3125 #endif 3126 if(pos >= (FLAC__int64)upper_bound) 3127 pos = (FLAC__int64)upper_bound - 1; 3128 if(pos < (FLAC__int64)lower_bound) 3129 pos = (FLAC__int64)lower_bound; 3130 if(decoder->private_->seek_callback(decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) { 3131 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3132 return false; 3133 } 3134 if(!FLAC__stream_decoder_flush(decoder)) { 3135 /* above call sets the state for us */ 3136 return false; 3137 } 3138 /* Now we need to get a frame. First we need to reset our 3139 * unparseable_frame_count; if we get too many unparseable 3140 * frames in a row, the read callback will return 3141 * FLAC__STREAM_DECODER_READ_STATUS_ABORT, causing 3142 * FLAC__stream_decoder_process_single() to return false. 3143 */ 3144 decoder->private_->unparseable_frame_count = 0; 3145 if(!FLAC__stream_decoder_process_single(decoder)) { 3146 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3147 return false; 3148 } 3149 /* our write callback will change the state when it gets to the target frame */ 3150 /* 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 */ 3151 #if 0 3152 /*@@@@@@ used to be the following; not clear if the check for end of stream is needed anymore */ 3153 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING && decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM) 3154 break; 3155 #endif 3156 if(!decoder->private_->is_seeking) 3157 break; 3158 3159 FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); 3160 this_frame_sample = decoder->private_->last_frame.header.number.sample_number; 3161 3162 if (0 == decoder->private_->samples_decoded || (this_frame_sample + decoder->private_->last_frame.header.blocksize >= upper_bound_sample && !first_seek)) { 3163 if (pos == (FLAC__int64)lower_bound) { 3164 /* can't move back any more than the first frame, something is fatally wrong */ 3165 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3166 return false; 3167 } 3168 /* our last move backwards wasn't big enough, try again */ 3169 approx_bytes_per_frame = approx_bytes_per_frame? approx_bytes_per_frame * 2 : 16; 3170 continue; 3171 } 3172 /* allow one seek over upper bound, so we can get a correct upper_bound_sample for streams with unknown total_samples */ 3173 first_seek = false; 3174 3175 /* make sure we are not seeking in corrupted stream */ 3176 if (this_frame_sample < lower_bound_sample) { 3177 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3178 return false; 3179 } 3180 3181 /* we need to narrow the search */ 3182 if(target_sample < this_frame_sample) { 3183 upper_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize; 3184 /*@@@@@@ what will decode position be if at end of stream? */ 3185 if(!FLAC__stream_decoder_get_decode_position(decoder, &upper_bound)) { 3186 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3187 return false; 3188 } 3189 approx_bytes_per_frame = (unsigned)(2 * (upper_bound - pos) / 3 + 16); 3190 } 3191 else { /* target_sample >= this_frame_sample + this frame's blocksize */ 3192 lower_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize; 3193 if(!FLAC__stream_decoder_get_decode_position(decoder, &lower_bound)) { 3194 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3195 return false; 3196 } 3197 approx_bytes_per_frame = (unsigned)(2 * (lower_bound - pos) / 3 + 16); 3198 } 3199 } 3200 3201 return true; 3202 } 3203 3204 #if FLAC__HAS_OGG 3205 FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample) 3206 { 3207 FLAC__uint64 left_pos = 0, right_pos = stream_length; 3208 FLAC__uint64 left_sample = 0, right_sample = FLAC__stream_decoder_get_total_samples(decoder); 3209 FLAC__uint64 this_frame_sample = (FLAC__uint64)0 - 1; 3210 FLAC__uint64 pos = 0; /* only initialized to avoid compiler warning */ 3211 FLAC__bool did_a_seek; 3212 unsigned iteration = 0; 3213 3214 /* In the first iterations, we will calculate the target byte position 3215 * by the distance from the target sample to left_sample and 3216 * right_sample (let's call it "proportional search"). After that, we 3217 * will switch to binary search. 3218 */ 3219 unsigned BINARY_SEARCH_AFTER_ITERATION = 2; 3220 3221 /* We will switch to a linear search once our current sample is less 3222 * than this number of samples ahead of the target sample 3223 */ 3224 static const FLAC__uint64 LINEAR_SEARCH_WITHIN_SAMPLES = FLAC__MAX_BLOCK_SIZE * 2; 3225 3226 /* If the total number of samples is unknown, use a large value, and 3227 * force binary search immediately. 3228 */ 3229 if(right_sample == 0) { 3230 right_sample = (FLAC__uint64)(-1); 3231 BINARY_SEARCH_AFTER_ITERATION = 0; 3232 } 3233 3234 decoder->private_->target_sample = target_sample; 3235 for( ; ; iteration++) { 3236 if (iteration == 0 || this_frame_sample > target_sample || target_sample - this_frame_sample > LINEAR_SEARCH_WITHIN_SAMPLES) { 3237 if (iteration >= BINARY_SEARCH_AFTER_ITERATION) { 3238 pos = (right_pos + left_pos) / 2; 3239 } 3240 else { 3241 #ifndef FLAC__INTEGER_ONLY_LIBRARY 3242 pos = (FLAC__uint64)((FLAC__double)(target_sample - left_sample) / (FLAC__double)(right_sample - left_sample) * (FLAC__double)(right_pos - left_pos)); 3243 #else 3244 /* a little less accurate: */ 3245 if ((target_sample-left_sample <= 0xffffffff) && (right_pos-left_pos <= 0xffffffff)) 3246 pos = (FLAC__int64)(((target_sample-left_sample) * (right_pos-left_pos)) / (right_sample-left_sample)); 3247 else /* @@@ WATCHOUT, ~2TB limit */ 3248 pos = (FLAC__int64)((((target_sample-left_sample)>>8) * ((right_pos-left_pos)>>8)) / ((right_sample-left_sample)>>16)); 3249 #endif 3250 /* @@@ TODO: might want to limit pos to some distance 3251 * before EOF, to make sure we land before the last frame, 3252 * thereby getting a this_frame_sample and so having a better 3253 * estimate. 3254 */ 3255 } 3256 3257 /* physical seek */ 3258 if(decoder->private_->seek_callback((FLAC__StreamDecoder*)decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) { 3259 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3260 return false; 3261 } 3262 if(!FLAC__stream_decoder_flush(decoder)) { 3263 /* above call sets the state for us */ 3264 return false; 3265 } 3266 did_a_seek = true; 3267 } 3268 else 3269 did_a_seek = false; 3270 3271 decoder->private_->got_a_frame = false; 3272 if(!FLAC__stream_decoder_process_single(decoder)) { 3273 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3274 return false; 3275 } 3276 if(!decoder->private_->got_a_frame) { 3277 if(did_a_seek) { 3278 /* this can happen if we seek to a point after the last frame; we drop 3279 * to binary search right away in this case to avoid any wasted 3280 * iterations of proportional search. 3281 */ 3282 right_pos = pos; 3283 BINARY_SEARCH_AFTER_ITERATION = 0; 3284 } 3285 else { 3286 /* this can probably only happen if total_samples is unknown and the 3287 * target_sample is past the end of the stream 3288 */ 3289 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3290 return false; 3291 } 3292 } 3293 /* our write callback will change the state when it gets to the target frame */ 3294 else if(!decoder->private_->is_seeking) { 3295 break; 3296 } 3297 else { 3298 this_frame_sample = decoder->private_->last_frame.header.number.sample_number; 3299 FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); 3300 3301 if (did_a_seek) { 3302 if (this_frame_sample <= target_sample) { 3303 /* The 'equal' case should not happen, since 3304 * FLAC__stream_decoder_process_single() 3305 * should recognize that it has hit the 3306 * target sample and we would exit through 3307 * the 'break' above. 3308 */ 3309 FLAC__ASSERT(this_frame_sample != target_sample); 3310 3311 left_sample = this_frame_sample; 3312 /* sanity check to avoid infinite loop */ 3313 if (left_pos == pos) { 3314 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3315 return false; 3316 } 3317 left_pos = pos; 3318 } 3319 else if(this_frame_sample > target_sample) { 3320 right_sample = this_frame_sample; 3321 /* sanity check to avoid infinite loop */ 3322 if (right_pos == pos) { 3323 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3324 return false; 3325 } 3326 right_pos = pos; 3327 } 3328 } 3329 } 3330 } 3331 3332 return true; 3333 } 3334 #endif 3335 3336 FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data) 3337 { 3338 (void)client_data; 3339 3340 if(*bytes > 0) { 3341 *bytes = fread(buffer, sizeof(FLAC__byte), *bytes, decoder->private_->file); 3342 if(ferror(decoder->private_->file)) 3343 return FLAC__STREAM_DECODER_READ_STATUS_ABORT; 3344 else if(*bytes == 0) 3345 return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM; 3346 else 3347 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE; 3348 } 3349 else 3350 return FLAC__STREAM_DECODER_READ_STATUS_ABORT; /* abort to avoid a deadlock */ 3351 } 3352 3353 FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data) 3354 { 3355 (void)client_data; 3356 3357 if(decoder->private_->file == stdin) 3358 return FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED; 3359 else if(fseeko(decoder->private_->file, (FLAC__off_t)absolute_byte_offset, SEEK_SET) < 0) 3360 return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR; 3361 else 3362 return FLAC__STREAM_DECODER_SEEK_STATUS_OK; 3363 } 3364 3365 FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data) 3366 { 3367 FLAC__off_t pos; 3368 (void)client_data; 3369 3370 if(decoder->private_->file == stdin) 3371 return FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED; 3372 else if((pos = ftello(decoder->private_->file)) < 0) 3373 return FLAC__STREAM_DECODER_TELL_STATUS_ERROR; 3374 else { 3375 *absolute_byte_offset = (FLAC__uint64)pos; 3376 return FLAC__STREAM_DECODER_TELL_STATUS_OK; 3377 } 3378 } 3379 3380 FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data) 3381 { 3382 struct flac_stat_s filestats; 3383 (void)client_data; 3384 3385 if(decoder->private_->file == stdin) 3386 return FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED; 3387 else if(flac_fstat(fileno(decoder->private_->file), &filestats) != 0) 3388 return FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR; 3389 else { 3390 *stream_length = (FLAC__uint64)filestats.st_size; 3391 return FLAC__STREAM_DECODER_LENGTH_STATUS_OK; 3392 } 3393 } 3394 3395 FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data) 3396 { 3397 (void)client_data; 3398 3399 return feof(decoder->private_->file)? true : false; 3400 } 3401
