1 /* libFLAC - Free Lossless Audio Codec library 2 * Copyright (C) 2000-2009 Josh Coalson 3 * Copyright (C) 2011-2016 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 = FLAC__HAS_OGG; 60 61 62 /*********************************************************************** 63 * 64 * Private static data 65 * 66 ***********************************************************************/ 67 68 static const FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' }; 69 70 /*********************************************************************** 71 * 72 * Private class method prototypes 73 * 74 ***********************************************************************/ 75 76 static void set_defaults_(FLAC__StreamDecoder *decoder); 77 static FILE *get_binary_stdin_(void); 78 static FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels); 79 static FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id); 80 static FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder); 81 static FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder); 82 static FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length); 83 static FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length); 84 static FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj, unsigned length); 85 static FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj); 86 static FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj); 87 static FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder); 88 static FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder); 89 static FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode); 90 static FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder); 91 static FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode); 92 static FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode); 93 static FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode); 94 static FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode); 95 static FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode); 96 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); 97 static FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder); 98 static FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data); 99 #if FLAC__HAS_OGG 100 static FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes); 101 static FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data); 102 #endif 103 static FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[]); 104 static void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status); 105 static FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample); 106 #if FLAC__HAS_OGG 107 static FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample); 108 #endif 109 static FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data); 110 static FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data); 111 static FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data); 112 static FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data); 113 static FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data); 114 115 /*********************************************************************** 116 * 117 * Private class data 118 * 119 ***********************************************************************/ 120 121 typedef struct FLAC__StreamDecoderPrivate { 122 FLAC__bool is_ogg; 123 FLAC__StreamDecoderReadCallback read_callback; 124 FLAC__StreamDecoderSeekCallback seek_callback; 125 FLAC__StreamDecoderTellCallback tell_callback; 126 FLAC__StreamDecoderLengthCallback length_callback; 127 FLAC__StreamDecoderEofCallback eof_callback; 128 FLAC__StreamDecoderWriteCallback write_callback; 129 FLAC__StreamDecoderMetadataCallback metadata_callback; 130 FLAC__StreamDecoderErrorCallback error_callback; 131 /* generic 32-bit datapath: */ 132 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[]); 133 /* generic 64-bit datapath: */ 134 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[]); 135 /* for use when the signal is <= 16 bits-per-sample, or <= 15 bits-per-sample on a side channel (which requires 1 extra bit): */ 136 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[]); 137 void *client_data; 138 FILE *file; /* only used if FLAC__stream_decoder_init_file()/FLAC__stream_decoder_init_file() called, else NULL */ 139 FLAC__BitReader *input; 140 FLAC__int32 *output[FLAC__MAX_CHANNELS]; 141 FLAC__int32 *residual[FLAC__MAX_CHANNELS]; /* WATCHOUT: these are the aligned pointers; the real pointers that should be free()'d are residual_unaligned[] below */ 142 FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents[FLAC__MAX_CHANNELS]; 143 unsigned output_capacity, output_channels; 144 FLAC__uint32 fixed_block_size, next_fixed_block_size; 145 FLAC__uint64 samples_decoded; 146 FLAC__bool has_stream_info, has_seek_table; 147 FLAC__StreamMetadata stream_info; 148 FLAC__StreamMetadata seek_table; 149 FLAC__bool metadata_filter[128]; /* MAGIC number 128 == total number of metadata block types == 1 << 7 */ 150 FLAC__byte *metadata_filter_ids; 151 size_t metadata_filter_ids_count, metadata_filter_ids_capacity; /* units for both are IDs, not bytes */ 152 FLAC__Frame frame; 153 FLAC__bool cached; /* true if there is a byte in lookahead */ 154 FLAC__CPUInfo cpuinfo; 155 FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */ 156 FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */ 157 /* unaligned (original) pointers to allocated data */ 158 FLAC__int32 *residual_unaligned[FLAC__MAX_CHANNELS]; 159 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 */ 160 FLAC__bool internal_reset_hack; /* used only during init() so we can call reset to set up the decoder without rewinding the input */ 161 FLAC__bool is_seeking; 162 FLAC__MD5Context md5context; 163 FLAC__byte computed_md5sum[16]; /* this is the sum we computed from the decoded data */ 164 /* (the rest of these are only used for seeking) */ 165 FLAC__Frame last_frame; /* holds the info of the last frame we seeked to */ 166 FLAC__uint64 first_frame_offset; /* hint to the seek routine of where in the stream the first audio frame starts */ 167 FLAC__uint64 target_sample; 168 unsigned unparseable_frame_count; /* used to tell whether we're decoding a future version of FLAC or just got a bad sync */ 169 FLAC__bool got_a_frame; /* hack needed in Ogg FLAC seek routine to check when process_single() actually writes a frame */ 170 } FLAC__StreamDecoderPrivate; 171 172 /*********************************************************************** 173 * 174 * Public static class data 175 * 176 ***********************************************************************/ 177 178 FLAC_API const char * const FLAC__StreamDecoderStateString[] = { 179 "FLAC__STREAM_DECODER_SEARCH_FOR_METADATA", 180 "FLAC__STREAM_DECODER_READ_METADATA", 181 "FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC", 182 "FLAC__STREAM_DECODER_READ_FRAME", 183 "FLAC__STREAM_DECODER_END_OF_STREAM", 184 "FLAC__STREAM_DECODER_OGG_ERROR", 185 "FLAC__STREAM_DECODER_SEEK_ERROR", 186 "FLAC__STREAM_DECODER_ABORTED", 187 "FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR", 188 "FLAC__STREAM_DECODER_UNINITIALIZED" 189 }; 190 191 FLAC_API const char * const FLAC__StreamDecoderInitStatusString[] = { 192 "FLAC__STREAM_DECODER_INIT_STATUS_OK", 193 "FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER", 194 "FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS", 195 "FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR", 196 "FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE", 197 "FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED" 198 }; 199 200 FLAC_API const char * const FLAC__StreamDecoderReadStatusString[] = { 201 "FLAC__STREAM_DECODER_READ_STATUS_CONTINUE", 202 "FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM", 203 "FLAC__STREAM_DECODER_READ_STATUS_ABORT" 204 }; 205 206 FLAC_API const char * const FLAC__StreamDecoderSeekStatusString[] = { 207 "FLAC__STREAM_DECODER_SEEK_STATUS_OK", 208 "FLAC__STREAM_DECODER_SEEK_STATUS_ERROR", 209 "FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED" 210 }; 211 212 FLAC_API const char * const FLAC__StreamDecoderTellStatusString[] = { 213 "FLAC__STREAM_DECODER_TELL_STATUS_OK", 214 "FLAC__STREAM_DECODER_TELL_STATUS_ERROR", 215 "FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED" 216 }; 217 218 FLAC_API const char * const FLAC__StreamDecoderLengthStatusString[] = { 219 "FLAC__STREAM_DECODER_LENGTH_STATUS_OK", 220 "FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR", 221 "FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED" 222 }; 223 224 FLAC_API const char * const FLAC__StreamDecoderWriteStatusString[] = { 225 "FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE", 226 "FLAC__STREAM_DECODER_WRITE_STATUS_ABORT" 227 }; 228 229 FLAC_API const char * const FLAC__StreamDecoderErrorStatusString[] = { 230 "FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC", 231 "FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER", 232 "FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH", 233 "FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM" 234 }; 235 236 /*********************************************************************** 237 * 238 * Class constructor/destructor 239 * 240 ***********************************************************************/ 241 FLAC_API FLAC__StreamDecoder *FLAC__stream_decoder_new(void) 242 { 243 FLAC__StreamDecoder *decoder; 244 unsigned i; 245 246 FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */ 247 248 decoder = calloc(1, sizeof(FLAC__StreamDecoder)); 249 if(decoder == 0) { 250 return 0; 251 } 252 253 decoder->protected_ = calloc(1, sizeof(FLAC__StreamDecoderProtected)); 254 if(decoder->protected_ == 0) { 255 free(decoder); 256 return 0; 257 } 258 259 decoder->private_ = calloc(1, sizeof(FLAC__StreamDecoderPrivate)); 260 if(decoder->private_ == 0) { 261 free(decoder->protected_); 262 free(decoder); 263 return 0; 264 } 265 266 decoder->private_->input = FLAC__bitreader_new(); 267 if(decoder->private_->input == 0) { 268 free(decoder->private_); 269 free(decoder->protected_); 270 free(decoder); 271 return 0; 272 } 273 274 decoder->private_->metadata_filter_ids_capacity = 16; 275 if(0 == (decoder->private_->metadata_filter_ids = malloc((FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) * decoder->private_->metadata_filter_ids_capacity))) { 276 FLAC__bitreader_delete(decoder->private_->input); 277 free(decoder->private_); 278 free(decoder->protected_); 279 free(decoder); 280 return 0; 281 } 282 283 for(i = 0; i < FLAC__MAX_CHANNELS; i++) { 284 decoder->private_->output[i] = 0; 285 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0; 286 } 287 288 decoder->private_->output_capacity = 0; 289 decoder->private_->output_channels = 0; 290 decoder->private_->has_seek_table = false; 291 292 for(i = 0; i < FLAC__MAX_CHANNELS; i++) 293 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&decoder->private_->partitioned_rice_contents[i]); 294 295 decoder->private_->file = 0; 296 297 set_defaults_(decoder); 298 299 decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED; 300 301 return decoder; 302 } 303 304 FLAC_API void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder) 305 { 306 unsigned i; 307 308 if (decoder == NULL) 309 return ; 310 311 FLAC__ASSERT(0 != decoder->protected_); 312 FLAC__ASSERT(0 != decoder->private_); 313 FLAC__ASSERT(0 != decoder->private_->input); 314 315 (void)FLAC__stream_decoder_finish(decoder); 316 317 if(0 != decoder->private_->metadata_filter_ids) 318 free(decoder->private_->metadata_filter_ids); 319 320 FLAC__bitreader_delete(decoder->private_->input); 321 322 for(i = 0; i < FLAC__MAX_CHANNELS; i++) 323 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&decoder->private_->partitioned_rice_contents[i]); 324 325 free(decoder->private_); 326 free(decoder->protected_); 327 free(decoder); 328 } 329 330 /*********************************************************************** 331 * 332 * Public class methods 333 * 334 ***********************************************************************/ 335 336 static FLAC__StreamDecoderInitStatus init_stream_internal_( 337 FLAC__StreamDecoder *decoder, 338 FLAC__StreamDecoderReadCallback read_callback, 339 FLAC__StreamDecoderSeekCallback seek_callback, 340 FLAC__StreamDecoderTellCallback tell_callback, 341 FLAC__StreamDecoderLengthCallback length_callback, 342 FLAC__StreamDecoderEofCallback eof_callback, 343 FLAC__StreamDecoderWriteCallback write_callback, 344 FLAC__StreamDecoderMetadataCallback metadata_callback, 345 FLAC__StreamDecoderErrorCallback error_callback, 346 void *client_data, 347 FLAC__bool is_ogg 348 ) 349 { 350 FLAC__ASSERT(0 != decoder); 351 352 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 353 return FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED; 354 355 if(FLAC__HAS_OGG == 0 && is_ogg) 356 return FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER; 357 358 if( 359 0 == read_callback || 360 0 == write_callback || 361 0 == error_callback || 362 (seek_callback && (0 == tell_callback || 0 == length_callback || 0 == eof_callback)) 363 ) 364 return FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS; 365 366 #if FLAC__HAS_OGG 367 decoder->private_->is_ogg = is_ogg; 368 if(is_ogg && !FLAC__ogg_decoder_aspect_init(&decoder->protected_->ogg_decoder_aspect)) 369 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE; 370 #endif 371 372 /* 373 * get the CPU info and set the function pointers 374 */ 375 FLAC__cpu_info(&decoder->private_->cpuinfo); 376 /* first default to the non-asm routines */ 377 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal; 378 decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide; 379 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal; 380 /* now override with asm where appropriate */ 381 #ifndef FLAC__NO_ASM 382 if(decoder->private_->cpuinfo.use_asm) { 383 #ifdef FLAC__CPU_IA32 384 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32); 385 #ifdef FLAC__HAS_NASM 386 decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide_asm_ia32; /* OPT_IA32: was really necessary for GCC < 4.9 */ 387 if(decoder->private_->cpuinfo.ia32.mmx) { 388 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32; 389 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32_mmx; 390 } 391 else { 392 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32; 393 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32; 394 } 395 #endif 396 #if FLAC__HAS_X86INTRIN && ! defined FLAC__INTEGER_ONLY_LIBRARY 397 # if defined FLAC__SSE2_SUPPORTED && !defined FLAC__HAS_NASM /* OPT_SSE: not better than MMX asm */ 398 if(decoder->private_->cpuinfo.ia32.sse2) { 399 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_16_intrin_sse2; 400 } 401 # endif 402 # if defined FLAC__SSE4_1_SUPPORTED 403 if(decoder->private_->cpuinfo.ia32.sse41) { 404 decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide_intrin_sse41; 405 } 406 # endif 407 #endif 408 #elif defined FLAC__CPU_X86_64 409 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_X86_64); 410 /* No useful SSE optimizations yet */ 411 #endif 412 } 413 #endif 414 415 /* from here on, errors are fatal */ 416 417 if(!FLAC__bitreader_init(decoder->private_->input, read_callback_, decoder)) { 418 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 419 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR; 420 } 421 422 decoder->private_->read_callback = read_callback; 423 decoder->private_->seek_callback = seek_callback; 424 decoder->private_->tell_callback = tell_callback; 425 decoder->private_->length_callback = length_callback; 426 decoder->private_->eof_callback = eof_callback; 427 decoder->private_->write_callback = write_callback; 428 decoder->private_->metadata_callback = metadata_callback; 429 decoder->private_->error_callback = error_callback; 430 decoder->private_->client_data = client_data; 431 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0; 432 decoder->private_->samples_decoded = 0; 433 decoder->private_->has_stream_info = false; 434 decoder->private_->cached = false; 435 436 decoder->private_->do_md5_checking = decoder->protected_->md5_checking; 437 decoder->private_->is_seeking = false; 438 439 decoder->private_->internal_reset_hack = true; /* so the following reset does not try to rewind the input */ 440 if(!FLAC__stream_decoder_reset(decoder)) { 441 /* above call sets the state for us */ 442 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR; 443 } 444 445 return FLAC__STREAM_DECODER_INIT_STATUS_OK; 446 } 447 448 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_stream( 449 FLAC__StreamDecoder *decoder, 450 FLAC__StreamDecoderReadCallback read_callback, 451 FLAC__StreamDecoderSeekCallback seek_callback, 452 FLAC__StreamDecoderTellCallback tell_callback, 453 FLAC__StreamDecoderLengthCallback length_callback, 454 FLAC__StreamDecoderEofCallback eof_callback, 455 FLAC__StreamDecoderWriteCallback write_callback, 456 FLAC__StreamDecoderMetadataCallback metadata_callback, 457 FLAC__StreamDecoderErrorCallback error_callback, 458 void *client_data 459 ) 460 { 461 return init_stream_internal_( 462 decoder, 463 read_callback, 464 seek_callback, 465 tell_callback, 466 length_callback, 467 eof_callback, 468 write_callback, 469 metadata_callback, 470 error_callback, 471 client_data, 472 /*is_ogg=*/false 473 ); 474 } 475 476 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_stream( 477 FLAC__StreamDecoder *decoder, 478 FLAC__StreamDecoderReadCallback read_callback, 479 FLAC__StreamDecoderSeekCallback seek_callback, 480 FLAC__StreamDecoderTellCallback tell_callback, 481 FLAC__StreamDecoderLengthCallback length_callback, 482 FLAC__StreamDecoderEofCallback eof_callback, 483 FLAC__StreamDecoderWriteCallback write_callback, 484 FLAC__StreamDecoderMetadataCallback metadata_callback, 485 FLAC__StreamDecoderErrorCallback error_callback, 486 void *client_data 487 ) 488 { 489 return init_stream_internal_( 490 decoder, 491 read_callback, 492 seek_callback, 493 tell_callback, 494 length_callback, 495 eof_callback, 496 write_callback, 497 metadata_callback, 498 error_callback, 499 client_data, 500 /*is_ogg=*/true 501 ); 502 } 503 504 static FLAC__StreamDecoderInitStatus init_FILE_internal_( 505 FLAC__StreamDecoder *decoder, 506 FILE *file, 507 FLAC__StreamDecoderWriteCallback write_callback, 508 FLAC__StreamDecoderMetadataCallback metadata_callback, 509 FLAC__StreamDecoderErrorCallback error_callback, 510 void *client_data, 511 FLAC__bool is_ogg 512 ) 513 { 514 FLAC__ASSERT(0 != decoder); 515 FLAC__ASSERT(0 != file); 516 517 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 518 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED; 519 520 if(0 == write_callback || 0 == error_callback) 521 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS; 522 523 /* 524 * To make sure that our file does not go unclosed after an error, we 525 * must assign the FILE pointer before any further error can occur in 526 * this routine. 527 */ 528 if(file == stdin) 529 file = get_binary_stdin_(); /* just to be safe */ 530 531 decoder->private_->file = file; 532 533 return init_stream_internal_( 534 decoder, 535 file_read_callback_, 536 decoder->private_->file == stdin? 0: file_seek_callback_, 537 decoder->private_->file == stdin? 0: file_tell_callback_, 538 decoder->private_->file == stdin? 0: file_length_callback_, 539 file_eof_callback_, 540 write_callback, 541 metadata_callback, 542 error_callback, 543 client_data, 544 is_ogg 545 ); 546 } 547 548 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_FILE( 549 FLAC__StreamDecoder *decoder, 550 FILE *file, 551 FLAC__StreamDecoderWriteCallback write_callback, 552 FLAC__StreamDecoderMetadataCallback metadata_callback, 553 FLAC__StreamDecoderErrorCallback error_callback, 554 void *client_data 555 ) 556 { 557 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false); 558 } 559 560 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_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=*/true); 570 } 571 572 static FLAC__StreamDecoderInitStatus init_file_internal_( 573 FLAC__StreamDecoder *decoder, 574 const char *filename, 575 FLAC__StreamDecoderWriteCallback write_callback, 576 FLAC__StreamDecoderMetadataCallback metadata_callback, 577 FLAC__StreamDecoderErrorCallback error_callback, 578 void *client_data, 579 FLAC__bool is_ogg 580 ) 581 { 582 FILE *file; 583 584 FLAC__ASSERT(0 != decoder); 585 586 /* 587 * To make sure that our file does not go unclosed after an error, we 588 * have to do the same entrance checks here that are later performed 589 * in FLAC__stream_decoder_init_FILE() before the FILE* is assigned. 590 */ 591 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 592 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED; 593 594 if(0 == write_callback || 0 == error_callback) 595 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS; 596 597 file = filename? flac_fopen(filename, "rb") : stdin; 598 599 if(0 == file) 600 return FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE; 601 602 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, is_ogg); 603 } 604 605 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_file( 606 FLAC__StreamDecoder *decoder, 607 const char *filename, 608 FLAC__StreamDecoderWriteCallback write_callback, 609 FLAC__StreamDecoderMetadataCallback metadata_callback, 610 FLAC__StreamDecoderErrorCallback error_callback, 611 void *client_data 612 ) 613 { 614 return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false); 615 } 616 617 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_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=*/true); 627 } 628 629 FLAC_API FLAC__bool FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder) 630 { 631 FLAC__bool md5_failed = false; 632 unsigned i; 633 634 FLAC__ASSERT(0 != decoder); 635 FLAC__ASSERT(0 != decoder->private_); 636 FLAC__ASSERT(0 != decoder->protected_); 637 638 if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED) 639 return true; 640 641 /* see the comment in FLAC__stream_decoder_reset() as to why we 642 * always call FLAC__MD5Final() 643 */ 644 FLAC__MD5Final(decoder->private_->computed_md5sum, &decoder->private_->md5context); 645 646 free(decoder->private_->seek_table.data.seek_table.points); 647 decoder->private_->seek_table.data.seek_table.points = 0; 648 decoder->private_->has_seek_table = false; 649 650 FLAC__bitreader_free(decoder->private_->input); 651 for(i = 0; i < FLAC__MAX_CHANNELS; i++) { 652 /* WATCHOUT: 653 * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the 654 * output arrays have a buffer of up to 3 zeroes in front 655 * (at negative indices) for alignment purposes; we use 4 656 * to keep the data well-aligned. 657 */ 658 if(0 != decoder->private_->output[i]) { 659 free(decoder->private_->output[i]-4); 660 decoder->private_->output[i] = 0; 661 } 662 if(0 != decoder->private_->residual_unaligned[i]) { 663 free(decoder->private_->residual_unaligned[i]); 664 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0; 665 } 666 } 667 decoder->private_->output_capacity = 0; 668 decoder->private_->output_channels = 0; 669 670 #if FLAC__HAS_OGG 671 if(decoder->private_->is_ogg) 672 FLAC__ogg_decoder_aspect_finish(&decoder->protected_->ogg_decoder_aspect); 673 #endif 674 675 if(0 != decoder->private_->file) { 676 if(decoder->private_->file != stdin) 677 fclose(decoder->private_->file); 678 decoder->private_->file = 0; 679 } 680 681 if(decoder->private_->do_md5_checking) { 682 if(memcmp(decoder->private_->stream_info.data.stream_info.md5sum, decoder->private_->computed_md5sum, 16)) 683 md5_failed = true; 684 } 685 decoder->private_->is_seeking = false; 686 687 set_defaults_(decoder); 688 689 decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED; 690 691 return !md5_failed; 692 } 693 694 FLAC_API FLAC__bool FLAC__stream_decoder_set_ogg_serial_number(FLAC__StreamDecoder *decoder, long value) 695 { 696 FLAC__ASSERT(0 != decoder); 697 FLAC__ASSERT(0 != decoder->private_); 698 FLAC__ASSERT(0 != decoder->protected_); 699 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 700 return false; 701 #if FLAC__HAS_OGG 702 /* can't check decoder->private_->is_ogg since that's not set until init time */ 703 FLAC__ogg_decoder_aspect_set_serial_number(&decoder->protected_->ogg_decoder_aspect, value); 704 return true; 705 #else 706 (void)value; 707 return false; 708 #endif 709 } 710 711 FLAC_API FLAC__bool FLAC__stream_decoder_set_md5_checking(FLAC__StreamDecoder *decoder, FLAC__bool value) 712 { 713 FLAC__ASSERT(0 != decoder); 714 FLAC__ASSERT(0 != decoder->protected_); 715 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 716 return false; 717 decoder->protected_->md5_checking = value; 718 return true; 719 } 720 721 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type) 722 { 723 FLAC__ASSERT(0 != decoder); 724 FLAC__ASSERT(0 != decoder->private_); 725 FLAC__ASSERT(0 != decoder->protected_); 726 FLAC__ASSERT((unsigned)type <= FLAC__MAX_METADATA_TYPE_CODE); 727 /* double protection */ 728 if((unsigned)type > FLAC__MAX_METADATA_TYPE_CODE) 729 return false; 730 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 731 return false; 732 decoder->private_->metadata_filter[type] = true; 733 if(type == FLAC__METADATA_TYPE_APPLICATION) 734 decoder->private_->metadata_filter_ids_count = 0; 735 return true; 736 } 737 738 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4]) 739 { 740 FLAC__ASSERT(0 != decoder); 741 FLAC__ASSERT(0 != decoder->private_); 742 FLAC__ASSERT(0 != decoder->protected_); 743 FLAC__ASSERT(0 != id); 744 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 745 return false; 746 747 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION]) 748 return true; 749 750 FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids); 751 752 if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) { 753 if(0 == (decoder->private_->metadata_filter_ids = safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) { 754 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 755 return false; 756 } 757 decoder->private_->metadata_filter_ids_capacity *= 2; 758 } 759 760 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)); 761 decoder->private_->metadata_filter_ids_count++; 762 763 return true; 764 } 765 766 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder) 767 { 768 unsigned i; 769 FLAC__ASSERT(0 != decoder); 770 FLAC__ASSERT(0 != decoder->private_); 771 FLAC__ASSERT(0 != decoder->protected_); 772 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 773 return false; 774 for(i = 0; i < sizeof(decoder->private_->metadata_filter) / sizeof(decoder->private_->metadata_filter[0]); i++) 775 decoder->private_->metadata_filter[i] = true; 776 decoder->private_->metadata_filter_ids_count = 0; 777 return true; 778 } 779 780 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type) 781 { 782 FLAC__ASSERT(0 != decoder); 783 FLAC__ASSERT(0 != decoder->private_); 784 FLAC__ASSERT(0 != decoder->protected_); 785 FLAC__ASSERT((unsigned)type <= FLAC__MAX_METADATA_TYPE_CODE); 786 /* double protection */ 787 if((unsigned)type > FLAC__MAX_METADATA_TYPE_CODE) 788 return false; 789 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 790 return false; 791 decoder->private_->metadata_filter[type] = false; 792 if(type == FLAC__METADATA_TYPE_APPLICATION) 793 decoder->private_->metadata_filter_ids_count = 0; 794 return true; 795 } 796 797 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4]) 798 { 799 FLAC__ASSERT(0 != decoder); 800 FLAC__ASSERT(0 != decoder->private_); 801 FLAC__ASSERT(0 != decoder->protected_); 802 FLAC__ASSERT(0 != id); 803 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 804 return false; 805 806 if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION]) 807 return true; 808 809 FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids); 810 811 if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) { 812 if(0 == (decoder->private_->metadata_filter_ids = safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) { 813 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 814 return false; 815 } 816 decoder->private_->metadata_filter_ids_capacity *= 2; 817 } 818 819 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)); 820 decoder->private_->metadata_filter_ids_count++; 821 822 return true; 823 } 824 825 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder) 826 { 827 FLAC__ASSERT(0 != decoder); 828 FLAC__ASSERT(0 != decoder->private_); 829 FLAC__ASSERT(0 != decoder->protected_); 830 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) 831 return false; 832 memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter)); 833 decoder->private_->metadata_filter_ids_count = 0; 834 return true; 835 } 836 837 FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder) 838 { 839 FLAC__ASSERT(0 != decoder); 840 FLAC__ASSERT(0 != decoder->protected_); 841 return decoder->protected_->state; 842 } 843 844 FLAC_API const char *FLAC__stream_decoder_get_resolved_state_string(const FLAC__StreamDecoder *decoder) 845 { 846 return FLAC__StreamDecoderStateString[decoder->protected_->state]; 847 } 848 849 FLAC_API FLAC__bool FLAC__stream_decoder_get_md5_checking(const FLAC__StreamDecoder *decoder) 850 { 851 FLAC__ASSERT(0 != decoder); 852 FLAC__ASSERT(0 != decoder->protected_); 853 return decoder->protected_->md5_checking; 854 } 855 856 FLAC_API FLAC__uint64 FLAC__stream_decoder_get_total_samples(const FLAC__StreamDecoder *decoder) 857 { 858 FLAC__ASSERT(0 != decoder); 859 FLAC__ASSERT(0 != decoder->protected_); 860 return decoder->private_->has_stream_info? decoder->private_->stream_info.data.stream_info.total_samples : 0; 861 } 862 863 FLAC_API unsigned FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder) 864 { 865 FLAC__ASSERT(0 != decoder); 866 FLAC__ASSERT(0 != decoder->protected_); 867 return decoder->protected_->channels; 868 } 869 870 FLAC_API FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder) 871 { 872 FLAC__ASSERT(0 != decoder); 873 FLAC__ASSERT(0 != decoder->protected_); 874 return decoder->protected_->channel_assignment; 875 } 876 877 FLAC_API unsigned FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder) 878 { 879 FLAC__ASSERT(0 != decoder); 880 FLAC__ASSERT(0 != decoder->protected_); 881 return decoder->protected_->bits_per_sample; 882 } 883 884 FLAC_API unsigned FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder) 885 { 886 FLAC__ASSERT(0 != decoder); 887 FLAC__ASSERT(0 != decoder->protected_); 888 return decoder->protected_->sample_rate; 889 } 890 891 FLAC_API unsigned FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder) 892 { 893 FLAC__ASSERT(0 != decoder); 894 FLAC__ASSERT(0 != decoder->protected_); 895 return decoder->protected_->blocksize; 896 } 897 898 FLAC_API FLAC__bool FLAC__stream_decoder_get_decode_position(const FLAC__StreamDecoder *decoder, FLAC__uint64 *position) 899 { 900 FLAC__ASSERT(0 != decoder); 901 FLAC__ASSERT(0 != decoder->private_); 902 FLAC__ASSERT(0 != position); 903 904 if(FLAC__HAS_OGG && decoder->private_->is_ogg) 905 return false; 906 907 if(0 == decoder->private_->tell_callback) 908 return false; 909 if(decoder->private_->tell_callback(decoder, position, decoder->private_->client_data) != FLAC__STREAM_DECODER_TELL_STATUS_OK) 910 return false; 911 /* should never happen since all FLAC frames and metadata blocks are byte aligned, but check just in case */ 912 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) 913 return false; 914 FLAC__ASSERT(*position >= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder)); 915 *position -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder); 916 return true; 917 } 918 919 FLAC_API FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder) 920 { 921 FLAC__ASSERT(0 != decoder); 922 FLAC__ASSERT(0 != decoder->private_); 923 FLAC__ASSERT(0 != decoder->protected_); 924 925 if(!decoder->private_->internal_reset_hack && decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED) 926 return false; 927 928 decoder->private_->samples_decoded = 0; 929 decoder->private_->do_md5_checking = false; 930 931 #if FLAC__HAS_OGG 932 if(decoder->private_->is_ogg) 933 FLAC__ogg_decoder_aspect_flush(&decoder->protected_->ogg_decoder_aspect); 934 #endif 935 936 if(!FLAC__bitreader_clear(decoder->private_->input)) { 937 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 938 return false; 939 } 940 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 941 942 return true; 943 } 944 945 FLAC_API FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder) 946 { 947 FLAC__ASSERT(0 != decoder); 948 FLAC__ASSERT(0 != decoder->private_); 949 FLAC__ASSERT(0 != decoder->protected_); 950 951 if(!FLAC__stream_decoder_flush(decoder)) { 952 /* above call sets the state for us */ 953 return false; 954 } 955 956 #if FLAC__HAS_OGG 957 /*@@@ could go in !internal_reset_hack block below */ 958 if(decoder->private_->is_ogg) 959 FLAC__ogg_decoder_aspect_reset(&decoder->protected_->ogg_decoder_aspect); 960 #endif 961 962 /* Rewind if necessary. If FLAC__stream_decoder_init() is calling us, 963 * (internal_reset_hack) don't try to rewind since we are already at 964 * the beginning of the stream and don't want to fail if the input is 965 * not seekable. 966 */ 967 if(!decoder->private_->internal_reset_hack) { 968 if(decoder->private_->file == stdin) 969 return false; /* can't rewind stdin, reset fails */ 970 if(decoder->private_->seek_callback && decoder->private_->seek_callback(decoder, 0, decoder->private_->client_data) == FLAC__STREAM_DECODER_SEEK_STATUS_ERROR) 971 return false; /* seekable and seek fails, reset fails */ 972 } 973 else 974 decoder->private_->internal_reset_hack = false; 975 976 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA; 977 978 decoder->private_->has_stream_info = false; 979 980 free(decoder->private_->seek_table.data.seek_table.points); 981 decoder->private_->seek_table.data.seek_table.points = 0; 982 decoder->private_->has_seek_table = false; 983 984 decoder->private_->do_md5_checking = decoder->protected_->md5_checking; 985 /* 986 * This goes in reset() and not flush() because according to the spec, a 987 * fixed-blocksize stream must stay that way through the whole stream. 988 */ 989 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0; 990 991 /* We initialize the FLAC__MD5Context even though we may never use it. This 992 * is because md5 checking may be turned on to start and then turned off if 993 * a seek occurs. So we init the context here and finalize it in 994 * FLAC__stream_decoder_finish() to make sure things are always cleaned up 995 * properly. 996 */ 997 FLAC__MD5Init(&decoder->private_->md5context); 998 999 decoder->private_->first_frame_offset = 0; 1000 decoder->private_->unparseable_frame_count = 0; 1001 1002 return true; 1003 } 1004 1005 FLAC_API FLAC__bool FLAC__stream_decoder_process_single(FLAC__StreamDecoder *decoder) 1006 { 1007 FLAC__bool got_a_frame; 1008 FLAC__ASSERT(0 != decoder); 1009 FLAC__ASSERT(0 != decoder->protected_); 1010 1011 while(1) { 1012 switch(decoder->protected_->state) { 1013 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA: 1014 if(!find_metadata_(decoder)) 1015 return false; /* above function sets the status for us */ 1016 break; 1017 case FLAC__STREAM_DECODER_READ_METADATA: 1018 if(!read_metadata_(decoder)) 1019 return false; /* above function sets the status for us */ 1020 else 1021 return true; 1022 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC: 1023 if(!frame_sync_(decoder)) 1024 return true; /* above function sets the status for us */ 1025 break; 1026 case FLAC__STREAM_DECODER_READ_FRAME: 1027 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/true)) 1028 return false; /* above function sets the status for us */ 1029 if(got_a_frame) 1030 return true; /* above function sets the status for us */ 1031 break; 1032 case FLAC__STREAM_DECODER_END_OF_STREAM: 1033 case FLAC__STREAM_DECODER_ABORTED: 1034 return true; 1035 default: 1036 FLAC__ASSERT(0); 1037 return false; 1038 } 1039 } 1040 } 1041 1042 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder *decoder) 1043 { 1044 FLAC__ASSERT(0 != decoder); 1045 FLAC__ASSERT(0 != decoder->protected_); 1046 1047 while(1) { 1048 switch(decoder->protected_->state) { 1049 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA: 1050 if(!find_metadata_(decoder)) 1051 return false; /* above function sets the status for us */ 1052 break; 1053 case FLAC__STREAM_DECODER_READ_METADATA: 1054 if(!read_metadata_(decoder)) 1055 return false; /* above function sets the status for us */ 1056 break; 1057 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC: 1058 case FLAC__STREAM_DECODER_READ_FRAME: 1059 case FLAC__STREAM_DECODER_END_OF_STREAM: 1060 case FLAC__STREAM_DECODER_ABORTED: 1061 return true; 1062 default: 1063 FLAC__ASSERT(0); 1064 return false; 1065 } 1066 } 1067 } 1068 1069 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder *decoder) 1070 { 1071 FLAC__bool dummy; 1072 FLAC__ASSERT(0 != decoder); 1073 FLAC__ASSERT(0 != decoder->protected_); 1074 1075 while(1) { 1076 switch(decoder->protected_->state) { 1077 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA: 1078 if(!find_metadata_(decoder)) 1079 return false; /* above function sets the status for us */ 1080 break; 1081 case FLAC__STREAM_DECODER_READ_METADATA: 1082 if(!read_metadata_(decoder)) 1083 return false; /* above function sets the status for us */ 1084 break; 1085 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC: 1086 if(!frame_sync_(decoder)) 1087 return true; /* above function sets the status for us */ 1088 break; 1089 case FLAC__STREAM_DECODER_READ_FRAME: 1090 if(!read_frame_(decoder, &dummy, /*do_full_decode=*/true)) 1091 return false; /* above function sets the status for us */ 1092 break; 1093 case FLAC__STREAM_DECODER_END_OF_STREAM: 1094 case FLAC__STREAM_DECODER_ABORTED: 1095 return true; 1096 default: 1097 FLAC__ASSERT(0); 1098 return false; 1099 } 1100 } 1101 } 1102 1103 FLAC_API FLAC__bool FLAC__stream_decoder_skip_single_frame(FLAC__StreamDecoder *decoder) 1104 { 1105 FLAC__bool got_a_frame; 1106 FLAC__ASSERT(0 != decoder); 1107 FLAC__ASSERT(0 != decoder->protected_); 1108 1109 while(1) { 1110 switch(decoder->protected_->state) { 1111 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA: 1112 case FLAC__STREAM_DECODER_READ_METADATA: 1113 return false; /* above function sets the status for us */ 1114 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC: 1115 if(!frame_sync_(decoder)) 1116 return true; /* above function sets the status for us */ 1117 break; 1118 case FLAC__STREAM_DECODER_READ_FRAME: 1119 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/false)) 1120 return false; /* above function sets the status for us */ 1121 if(got_a_frame) 1122 return true; /* above function sets the status for us */ 1123 break; 1124 case FLAC__STREAM_DECODER_END_OF_STREAM: 1125 case FLAC__STREAM_DECODER_ABORTED: 1126 return true; 1127 default: 1128 FLAC__ASSERT(0); 1129 return false; 1130 } 1131 } 1132 } 1133 1134 FLAC_API FLAC__bool FLAC__stream_decoder_seek_absolute(FLAC__StreamDecoder *decoder, FLAC__uint64 sample) 1135 { 1136 FLAC__uint64 length; 1137 1138 FLAC__ASSERT(0 != decoder); 1139 1140 if( 1141 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA && 1142 decoder->protected_->state != FLAC__STREAM_DECODER_READ_METADATA && 1143 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC && 1144 decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME && 1145 decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM 1146 ) 1147 return false; 1148 1149 if(0 == decoder->private_->seek_callback) 1150 return false; 1151 1152 FLAC__ASSERT(decoder->private_->seek_callback); 1153 FLAC__ASSERT(decoder->private_->tell_callback); 1154 FLAC__ASSERT(decoder->private_->length_callback); 1155 FLAC__ASSERT(decoder->private_->eof_callback); 1156 1157 if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder)) 1158 return false; 1159 1160 decoder->private_->is_seeking = true; 1161 1162 /* turn off md5 checking if a seek is attempted */ 1163 decoder->private_->do_md5_checking = false; 1164 1165 /* 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) */ 1166 if(decoder->private_->length_callback(decoder, &length, decoder->private_->client_data) != FLAC__STREAM_DECODER_LENGTH_STATUS_OK) { 1167 decoder->private_->is_seeking = false; 1168 return false; 1169 } 1170 1171 /* if we haven't finished processing the metadata yet, do that so we have the STREAMINFO, SEEK_TABLE, and first_frame_offset */ 1172 if( 1173 decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA || 1174 decoder->protected_->state == FLAC__STREAM_DECODER_READ_METADATA 1175 ) { 1176 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder)) { 1177 /* above call sets the state for us */ 1178 decoder->private_->is_seeking = false; 1179 return false; 1180 } 1181 /* check this again in case we didn't know total_samples the first time */ 1182 if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder)) { 1183 decoder->private_->is_seeking = false; 1184 return false; 1185 } 1186 } 1187 1188 { 1189 const FLAC__bool ok = 1190 #if FLAC__HAS_OGG 1191 decoder->private_->is_ogg? 1192 seek_to_absolute_sample_ogg_(decoder, length, sample) : 1193 #endif 1194 seek_to_absolute_sample_(decoder, length, sample) 1195 ; 1196 decoder->private_->is_seeking = false; 1197 return ok; 1198 } 1199 } 1200 1201 /*********************************************************************** 1202 * 1203 * Protected class methods 1204 * 1205 ***********************************************************************/ 1206 1207 unsigned FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder) 1208 { 1209 FLAC__ASSERT(0 != decoder); 1210 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1211 FLAC__ASSERT(!(FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) & 7)); 1212 return FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) / 8; 1213 } 1214 1215 /*********************************************************************** 1216 * 1217 * Private class methods 1218 * 1219 ***********************************************************************/ 1220 1221 void set_defaults_(FLAC__StreamDecoder *decoder) 1222 { 1223 decoder->private_->is_ogg = false; 1224 decoder->private_->read_callback = 0; 1225 decoder->private_->seek_callback = 0; 1226 decoder->private_->tell_callback = 0; 1227 decoder->private_->length_callback = 0; 1228 decoder->private_->eof_callback = 0; 1229 decoder->private_->write_callback = 0; 1230 decoder->private_->metadata_callback = 0; 1231 decoder->private_->error_callback = 0; 1232 decoder->private_->client_data = 0; 1233 1234 memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter)); 1235 decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] = true; 1236 decoder->private_->metadata_filter_ids_count = 0; 1237 1238 decoder->protected_->md5_checking = false; 1239 1240 #if FLAC__HAS_OGG 1241 FLAC__ogg_decoder_aspect_set_defaults(&decoder->protected_->ogg_decoder_aspect); 1242 #endif 1243 } 1244 1245 /* 1246 * This will forcibly set stdin to binary mode (for OSes that require it) 1247 */ 1248 FILE *get_binary_stdin_(void) 1249 { 1250 /* if something breaks here it is probably due to the presence or 1251 * absence of an underscore before the identifiers 'setmode', 1252 * 'fileno', and/or 'O_BINARY'; check your system header files. 1253 */ 1254 #if defined _MSC_VER || defined __MINGW32__ 1255 _setmode(_fileno(stdin), _O_BINARY); 1256 #elif defined __CYGWIN__ 1257 /* almost certainly not needed for any modern Cygwin, but let's be safe... */ 1258 setmode(_fileno(stdin), _O_BINARY); 1259 #elif defined __EMX__ 1260 setmode(fileno(stdin), O_BINARY); 1261 #endif 1262 1263 return stdin; 1264 } 1265 1266 FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels) 1267 { 1268 unsigned i; 1269 FLAC__int32 *tmp; 1270 1271 if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels) 1272 return true; 1273 1274 /* simply using realloc() is not practical because the number of channels may change mid-stream */ 1275 1276 for(i = 0; i < FLAC__MAX_CHANNELS; i++) { 1277 if(0 != decoder->private_->output[i]) { 1278 free(decoder->private_->output[i]-4); 1279 decoder->private_->output[i] = 0; 1280 } 1281 if(0 != decoder->private_->residual_unaligned[i]) { 1282 free(decoder->private_->residual_unaligned[i]); 1283 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0; 1284 } 1285 } 1286 1287 for(i = 0; i < channels; i++) { 1288 /* WATCHOUT: 1289 * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the 1290 * output arrays have a buffer of up to 3 zeroes in front 1291 * (at negative indices) for alignment purposes; we use 4 1292 * to keep the data well-aligned. 1293 */ 1294 tmp = safe_malloc_muladd2_(sizeof(FLAC__int32), /*times (*/size, /*+*/4/*)*/); 1295 if(tmp == 0) { 1296 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1297 return false; 1298 } 1299 memset(tmp, 0, sizeof(FLAC__int32)*4); 1300 decoder->private_->output[i] = tmp + 4; 1301 1302 if(!FLAC__memory_alloc_aligned_int32_array(size, &decoder->private_->residual_unaligned[i], &decoder->private_->residual[i])) { 1303 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1304 return false; 1305 } 1306 } 1307 1308 decoder->private_->output_capacity = size; 1309 decoder->private_->output_channels = channels; 1310 1311 return true; 1312 } 1313 1314 FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id) 1315 { 1316 size_t i; 1317 1318 FLAC__ASSERT(0 != decoder); 1319 FLAC__ASSERT(0 != decoder->private_); 1320 1321 for(i = 0; i < decoder->private_->metadata_filter_ids_count; i++) 1322 if(0 == memcmp(decoder->private_->metadata_filter_ids + i * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8))) 1323 return true; 1324 1325 return false; 1326 } 1327 1328 FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder) 1329 { 1330 FLAC__uint32 x; 1331 unsigned i, id; 1332 FLAC__bool first = true; 1333 1334 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1335 1336 for(i = id = 0; i < 4; ) { 1337 if(decoder->private_->cached) { 1338 x = (FLAC__uint32)decoder->private_->lookahead; 1339 decoder->private_->cached = false; 1340 } 1341 else { 1342 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 1343 return false; /* read_callback_ sets the state for us */ 1344 } 1345 if(x == FLAC__STREAM_SYNC_STRING[i]) { 1346 first = true; 1347 i++; 1348 id = 0; 1349 continue; 1350 } 1351 1352 if(id >= 3) 1353 return false; 1354 1355 if(x == ID3V2_TAG_[id]) { 1356 id++; 1357 i = 0; 1358 if(id == 3) { 1359 if(!skip_id3v2_tag_(decoder)) 1360 return false; /* skip_id3v2_tag_ sets the state for us */ 1361 } 1362 continue; 1363 } 1364 id = 0; 1365 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */ 1366 decoder->private_->header_warmup[0] = (FLAC__byte)x; 1367 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 1368 return false; /* read_callback_ sets the state for us */ 1369 1370 /* 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 */ 1371 /* else we have to check if the second byte is the end of a sync code */ 1372 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */ 1373 decoder->private_->lookahead = (FLAC__byte)x; 1374 decoder->private_->cached = true; 1375 } 1376 else if(x >> 1 == 0x7c) { /* MAGIC NUMBER for the last 6 sync bits and reserved 7th bit */ 1377 decoder->private_->header_warmup[1] = (FLAC__byte)x; 1378 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME; 1379 return true; 1380 } 1381 } 1382 i = 0; 1383 if(first) { 1384 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 1385 first = false; 1386 } 1387 } 1388 1389 decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA; 1390 return true; 1391 } 1392 1393 FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder) 1394 { 1395 FLAC__bool is_last; 1396 FLAC__uint32 i, x, type, length; 1397 1398 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1399 1400 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_IS_LAST_LEN)) 1401 return false; /* read_callback_ sets the state for us */ 1402 is_last = x? true : false; 1403 1404 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN)) 1405 return false; /* read_callback_ sets the state for us */ 1406 1407 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN)) 1408 return false; /* read_callback_ sets the state for us */ 1409 1410 if(type == FLAC__METADATA_TYPE_STREAMINFO) { 1411 if(!read_metadata_streaminfo_(decoder, is_last, length)) 1412 return false; 1413 1414 decoder->private_->has_stream_info = true; 1415 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)) 1416 decoder->private_->do_md5_checking = false; 1417 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] && decoder->private_->metadata_callback) 1418 decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data); 1419 } 1420 else if(type == FLAC__METADATA_TYPE_SEEKTABLE) { 1421 /* just in case we already have a seek table, and reading the next one fails: */ 1422 decoder->private_->has_seek_table = false; 1423 1424 if(!read_metadata_seektable_(decoder, is_last, length)) 1425 return false; 1426 1427 decoder->private_->has_seek_table = true; 1428 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_SEEKTABLE] && decoder->private_->metadata_callback) 1429 decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data); 1430 } 1431 else { 1432 FLAC__bool skip_it = !decoder->private_->metadata_filter[type]; 1433 unsigned real_length = length; 1434 FLAC__StreamMetadata block; 1435 1436 memset(&block, 0, sizeof(block)); 1437 block.is_last = is_last; 1438 block.type = (FLAC__MetadataType)type; 1439 block.length = length; 1440 1441 if(type == FLAC__METADATA_TYPE_APPLICATION) { 1442 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)) 1443 return false; /* read_callback_ sets the state for us */ 1444 1445 if(real_length < FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) { /* underflow check */ 1446 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;/*@@@@@@ maybe wrong error? need to resync?*/ 1447 return false; 1448 } 1449 1450 real_length -= FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8; 1451 1452 if(decoder->private_->metadata_filter_ids_count > 0 && has_id_filtered_(decoder, block.data.application.id)) 1453 skip_it = !skip_it; 1454 } 1455 1456 if(skip_it) { 1457 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length)) 1458 return false; /* read_callback_ sets the state for us */ 1459 } 1460 else { 1461 FLAC__bool ok = true; 1462 switch(type) { 1463 case FLAC__METADATA_TYPE_PADDING: 1464 /* skip the padding bytes */ 1465 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length)) 1466 ok = false; /* read_callback_ sets the state for us */ 1467 break; 1468 case FLAC__METADATA_TYPE_APPLICATION: 1469 /* remember, we read the ID already */ 1470 if(real_length > 0) { 1471 if(0 == (block.data.application.data = malloc(real_length))) { 1472 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1473 ok = false; 1474 } 1475 else if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.data, real_length)) 1476 ok = false; /* read_callback_ sets the state for us */ 1477 } 1478 else 1479 block.data.application.data = 0; 1480 break; 1481 case FLAC__METADATA_TYPE_VORBIS_COMMENT: 1482 if(!read_metadata_vorbiscomment_(decoder, &block.data.vorbis_comment, real_length)) 1483 ok = false; 1484 break; 1485 case FLAC__METADATA_TYPE_CUESHEET: 1486 if(!read_metadata_cuesheet_(decoder, &block.data.cue_sheet)) 1487 ok = false; 1488 break; 1489 case FLAC__METADATA_TYPE_PICTURE: 1490 if(!read_metadata_picture_(decoder, &block.data.picture)) 1491 ok = false; 1492 break; 1493 case FLAC__METADATA_TYPE_STREAMINFO: 1494 case FLAC__METADATA_TYPE_SEEKTABLE: 1495 FLAC__ASSERT(0); 1496 break; 1497 default: 1498 if(real_length > 0) { 1499 if(0 == (block.data.unknown.data = malloc(real_length))) { 1500 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1501 ok = false; 1502 } 1503 else if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.unknown.data, real_length)) 1504 ok = false; /* read_callback_ sets the state for us */ 1505 } 1506 else 1507 block.data.unknown.data = 0; 1508 break; 1509 } 1510 if(ok && !decoder->private_->is_seeking && decoder->private_->metadata_callback) 1511 decoder->private_->metadata_callback(decoder, &block, decoder->private_->client_data); 1512 1513 /* now we have to free any malloc()ed data in the block */ 1514 switch(type) { 1515 case FLAC__METADATA_TYPE_PADDING: 1516 break; 1517 case FLAC__METADATA_TYPE_APPLICATION: 1518 if(0 != block.data.application.data) 1519 free(block.data.application.data); 1520 break; 1521 case FLAC__METADATA_TYPE_VORBIS_COMMENT: 1522 if(0 != block.data.vorbis_comment.vendor_string.entry) 1523 free(block.data.vorbis_comment.vendor_string.entry); 1524 if(block.data.vorbis_comment.num_comments > 0) 1525 for(i = 0; i < block.data.vorbis_comment.num_comments; i++) 1526 if(0 != block.data.vorbis_comment.comments[i].entry) 1527 free(block.data.vorbis_comment.comments[i].entry); 1528 if(0 != block.data.vorbis_comment.comments) 1529 free(block.data.vorbis_comment.comments); 1530 break; 1531 case FLAC__METADATA_TYPE_CUESHEET: 1532 if(block.data.cue_sheet.num_tracks > 0) 1533 for(i = 0; i < block.data.cue_sheet.num_tracks; i++) 1534 if(0 != block.data.cue_sheet.tracks[i].indices) 1535 free(block.data.cue_sheet.tracks[i].indices); 1536 if(0 != block.data.cue_sheet.tracks) 1537 free(block.data.cue_sheet.tracks); 1538 break; 1539 case FLAC__METADATA_TYPE_PICTURE: 1540 if(0 != block.data.picture.mime_type) 1541 free(block.data.picture.mime_type); 1542 if(0 != block.data.picture.description) 1543 free(block.data.picture.description); 1544 if(0 != block.data.picture.data) 1545 free(block.data.picture.data); 1546 break; 1547 case FLAC__METADATA_TYPE_STREAMINFO: 1548 case FLAC__METADATA_TYPE_SEEKTABLE: 1549 FLAC__ASSERT(0); 1550 default: 1551 if(0 != block.data.unknown.data) 1552 free(block.data.unknown.data); 1553 break; 1554 } 1555 1556 if(!ok) /* anything that unsets "ok" should also make sure decoder->protected_->state is updated */ 1557 return false; 1558 } 1559 } 1560 1561 if(is_last) { 1562 /* if this fails, it's OK, it's just a hint for the seek routine */ 1563 if(!FLAC__stream_decoder_get_decode_position(decoder, &decoder->private_->first_frame_offset)) 1564 decoder->private_->first_frame_offset = 0; 1565 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 1566 } 1567 1568 return true; 1569 } 1570 1571 FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length) 1572 { 1573 FLAC__uint32 x; 1574 unsigned bits, used_bits = 0; 1575 1576 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1577 1578 decoder->private_->stream_info.type = FLAC__METADATA_TYPE_STREAMINFO; 1579 decoder->private_->stream_info.is_last = is_last; 1580 decoder->private_->stream_info.length = length; 1581 1582 bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN; 1583 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, bits)) 1584 return false; /* read_callback_ sets the state for us */ 1585 decoder->private_->stream_info.data.stream_info.min_blocksize = x; 1586 used_bits += bits; 1587 1588 bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN; 1589 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN)) 1590 return false; /* read_callback_ sets the state for us */ 1591 decoder->private_->stream_info.data.stream_info.max_blocksize = x; 1592 used_bits += bits; 1593 1594 bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN; 1595 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN)) 1596 return false; /* read_callback_ sets the state for us */ 1597 decoder->private_->stream_info.data.stream_info.min_framesize = x; 1598 used_bits += bits; 1599 1600 bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN; 1601 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN)) 1602 return false; /* read_callback_ sets the state for us */ 1603 decoder->private_->stream_info.data.stream_info.max_framesize = x; 1604 used_bits += bits; 1605 1606 bits = FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN; 1607 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN)) 1608 return false; /* read_callback_ sets the state for us */ 1609 decoder->private_->stream_info.data.stream_info.sample_rate = x; 1610 used_bits += bits; 1611 1612 bits = FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN; 1613 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN)) 1614 return false; /* read_callback_ sets the state for us */ 1615 decoder->private_->stream_info.data.stream_info.channels = x+1; 1616 used_bits += bits; 1617 1618 bits = FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN; 1619 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN)) 1620 return false; /* read_callback_ sets the state for us */ 1621 decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1; 1622 used_bits += bits; 1623 1624 bits = FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN; 1625 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)) 1626 return false; /* read_callback_ sets the state for us */ 1627 used_bits += bits; 1628 1629 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, decoder->private_->stream_info.data.stream_info.md5sum, 16)) 1630 return false; /* read_callback_ sets the state for us */ 1631 used_bits += 16*8; 1632 1633 /* skip the rest of the block */ 1634 FLAC__ASSERT(used_bits % 8 == 0); 1635 length -= (used_bits / 8); 1636 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length)) 1637 return false; /* read_callback_ sets the state for us */ 1638 1639 return true; 1640 } 1641 1642 FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length) 1643 { 1644 FLAC__uint32 i, x; 1645 FLAC__uint64 xx; 1646 1647 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1648 1649 decoder->private_->seek_table.type = FLAC__METADATA_TYPE_SEEKTABLE; 1650 decoder->private_->seek_table.is_last = is_last; 1651 decoder->private_->seek_table.length = length; 1652 1653 decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH; 1654 1655 /* use realloc since we may pass through here several times (e.g. after seeking) */ 1656 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)))) { 1657 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1658 return false; 1659 } 1660 for(i = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) { 1661 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN)) 1662 return false; /* read_callback_ sets the state for us */ 1663 decoder->private_->seek_table.data.seek_table.points[i].sample_number = xx; 1664 1665 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN)) 1666 return false; /* read_callback_ sets the state for us */ 1667 decoder->private_->seek_table.data.seek_table.points[i].stream_offset = xx; 1668 1669 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN)) 1670 return false; /* read_callback_ sets the state for us */ 1671 decoder->private_->seek_table.data.seek_table.points[i].frame_samples = x; 1672 } 1673 length -= (decoder->private_->seek_table.data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH); 1674 /* if there is a partial point left, skip over it */ 1675 if(length > 0) { 1676 /*@@@ do a send_error_to_client_() here? there's an argument for either way */ 1677 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length)) 1678 return false; /* read_callback_ sets the state for us */ 1679 } 1680 1681 return true; 1682 } 1683 1684 FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj, unsigned length) 1685 { 1686 FLAC__uint32 i; 1687 1688 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1689 1690 /* read vendor string */ 1691 if (length >= 8) { 1692 length -= 8; /* vendor string length + num comments entries alone take 8 bytes */ 1693 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32); 1694 if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->vendor_string.length)) 1695 return false; /* read_callback_ sets the state for us */ 1696 if (obj->vendor_string.length > 0) { 1697 if (length < obj->vendor_string.length) { 1698 obj->vendor_string.length = 0; 1699 obj->vendor_string.entry = 0; 1700 goto skip; 1701 } 1702 else 1703 length -= obj->vendor_string.length; 1704 if (0 == (obj->vendor_string.entry = safe_malloc_add_2op_(obj->vendor_string.length, /*+*/1))) { 1705 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1706 return false; 1707 } 1708 if (!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->vendor_string.entry, obj->vendor_string.length)) 1709 return false; /* read_callback_ sets the state for us */ 1710 obj->vendor_string.entry[obj->vendor_string.length] = '\0'; 1711 } 1712 else 1713 obj->vendor_string.entry = 0; 1714 1715 /* read num comments */ 1716 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN == 32); 1717 if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->num_comments)) 1718 return false; /* read_callback_ sets the state for us */ 1719 1720 /* read comments */ 1721 if (obj->num_comments > 100000) { 1722 /* Possibly malicious file. */ 1723 obj->num_comments = 0; 1724 return false; 1725 } 1726 if (obj->num_comments > 0) { 1727 if (0 == (obj->comments = safe_malloc_mul_2op_p(obj->num_comments, /*times*/sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) { 1728 obj->num_comments = 0; 1729 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1730 return false; 1731 } 1732 for (i = 0; i < obj->num_comments; i++) { 1733 /* Initialize here just to make sure. */ 1734 obj->comments[i].length = 0; 1735 obj->comments[i].entry = 0; 1736 1737 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32); 1738 if (length < 4) { 1739 obj->num_comments = i; 1740 goto skip; 1741 } 1742 else 1743 length -= 4; 1744 if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->comments[i].length)) { 1745 obj->num_comments = i; 1746 return false; /* read_callback_ sets the state for us */ 1747 } 1748 if (obj->comments[i].length > 0) { 1749 if (length < obj->comments[i].length) { 1750 obj->num_comments = i; 1751 goto skip; 1752 } 1753 else 1754 length -= obj->comments[i].length; 1755 if (0 == (obj->comments[i].entry = safe_malloc_add_2op_(obj->comments[i].length, /*+*/1))) { 1756 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1757 obj->num_comments = i; 1758 return false; 1759 } 1760 memset (obj->comments[i].entry, 0, obj->comments[i].length) ; 1761 if (!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->comments[i].entry, obj->comments[i].length)) { 1762 obj->num_comments = i; 1763 goto skip; 1764 } 1765 obj->comments[i].entry[obj->comments[i].length] = '\0'; 1766 } 1767 else 1768 obj->comments[i].entry = 0; 1769 } 1770 } 1771 } 1772 1773 skip: 1774 if (length > 0) { 1775 /* length > 0 can only happen on files with invalid data in comments */ 1776 if(obj->num_comments < 1) { 1777 free(obj->comments); 1778 obj->comments = NULL; 1779 } 1780 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length)) 1781 return false; /* read_callback_ sets the state for us */ 1782 } 1783 1784 return true; 1785 } 1786 1787 FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj) 1788 { 1789 FLAC__uint32 i, j, x; 1790 1791 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1792 1793 memset(obj, 0, sizeof(FLAC__StreamMetadata_CueSheet)); 1794 1795 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0); 1796 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)) 1797 return false; /* read_callback_ sets the state for us */ 1798 1799 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &obj->lead_in, FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN)) 1800 return false; /* read_callback_ sets the state for us */ 1801 1802 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN)) 1803 return false; /* read_callback_ sets the state for us */ 1804 obj->is_cd = x? true : false; 1805 1806 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_RESERVED_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_NUM_TRACKS_LEN)) 1810 return false; /* read_callback_ sets the state for us */ 1811 obj->num_tracks = x; 1812 1813 if(obj->num_tracks > 0) { 1814 if(0 == (obj->tracks = safe_calloc_(obj->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track)))) { 1815 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1816 return false; 1817 } 1818 for(i = 0; i < obj->num_tracks; i++) { 1819 FLAC__StreamMetadata_CueSheet_Track *track = &obj->tracks[i]; 1820 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &track->offset, FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN)) 1821 return false; /* read_callback_ sets the state for us */ 1822 1823 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN)) 1824 return false; /* read_callback_ sets the state for us */ 1825 track->number = (FLAC__byte)x; 1826 1827 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0); 1828 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)track->isrc, FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN/8)) 1829 return false; /* read_callback_ sets the state for us */ 1830 1831 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN)) 1832 return false; /* read_callback_ sets the state for us */ 1833 track->type = x; 1834 1835 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN)) 1836 return false; /* read_callback_ sets the state for us */ 1837 track->pre_emphasis = x; 1838 1839 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN)) 1840 return false; /* read_callback_ sets the state for us */ 1841 1842 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN)) 1843 return false; /* read_callback_ sets the state for us */ 1844 track->num_indices = (FLAC__byte)x; 1845 1846 if(track->num_indices > 0) { 1847 if(0 == (track->indices = safe_calloc_(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index)))) { 1848 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1849 return false; 1850 } 1851 for(j = 0; j < track->num_indices; j++) { 1852 FLAC__StreamMetadata_CueSheet_Index *indx = &track->indices[j]; 1853 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &indx->offset, FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN)) 1854 return false; /* read_callback_ sets the state for us */ 1855 1856 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN)) 1857 return false; /* read_callback_ sets the state for us */ 1858 indx->number = (FLAC__byte)x; 1859 1860 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN)) 1861 return false; /* read_callback_ sets the state for us */ 1862 } 1863 } 1864 } 1865 } 1866 1867 return true; 1868 } 1869 1870 FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj) 1871 { 1872 FLAC__uint32 x; 1873 1874 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 1875 1876 /* read type */ 1877 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_TYPE_LEN)) 1878 return false; /* read_callback_ sets the state for us */ 1879 obj->type = x; 1880 1881 /* read MIME type */ 1882 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN)) 1883 return false; /* read_callback_ sets the state for us */ 1884 if(0 == (obj->mime_type = safe_malloc_add_2op_(x, /*+*/1))) { 1885 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1886 return false; 1887 } 1888 if(x > 0) { 1889 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->mime_type, x)) 1890 return false; /* read_callback_ sets the state for us */ 1891 } 1892 obj->mime_type[x] = '\0'; 1893 1894 /* read description */ 1895 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN)) 1896 return false; /* read_callback_ sets the state for us */ 1897 if(0 == (obj->description = safe_malloc_add_2op_(x, /*+*/1))) { 1898 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1899 return false; 1900 } 1901 if(x > 0) { 1902 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->description, x)) 1903 return false; /* read_callback_ sets the state for us */ 1904 } 1905 obj->description[x] = '\0'; 1906 1907 /* read width */ 1908 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->width, FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN)) 1909 return false; /* read_callback_ sets the state for us */ 1910 1911 /* read height */ 1912 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->height, FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN)) 1913 return false; /* read_callback_ sets the state for us */ 1914 1915 /* read depth */ 1916 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->depth, FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN)) 1917 return false; /* read_callback_ sets the state for us */ 1918 1919 /* read colors */ 1920 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->colors, FLAC__STREAM_METADATA_PICTURE_COLORS_LEN)) 1921 return false; /* read_callback_ sets the state for us */ 1922 1923 /* read data */ 1924 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &(obj->data_length), FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN)) 1925 return false; /* read_callback_ sets the state for us */ 1926 if(0 == (obj->data = safe_malloc_(obj->data_length))) { 1927 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 1928 return false; 1929 } 1930 if(obj->data_length > 0) { 1931 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->data, obj->data_length)) 1932 return false; /* read_callback_ sets the state for us */ 1933 } 1934 1935 return true; 1936 } 1937 1938 FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder) 1939 { 1940 FLAC__uint32 x; 1941 unsigned i, skip; 1942 1943 /* skip the version and flags bytes */ 1944 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 24)) 1945 return false; /* read_callback_ sets the state for us */ 1946 /* get the size (in bytes) to skip */ 1947 skip = 0; 1948 for(i = 0; i < 4; i++) { 1949 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 1950 return false; /* read_callback_ sets the state for us */ 1951 skip <<= 7; 1952 skip |= (x & 0x7f); 1953 } 1954 /* skip the rest of the tag */ 1955 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, skip)) 1956 return false; /* read_callback_ sets the state for us */ 1957 return true; 1958 } 1959 1960 FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder) 1961 { 1962 FLAC__uint32 x; 1963 FLAC__bool first = true; 1964 1965 /* If we know the total number of samples in the stream, stop if we've read that many. */ 1966 /* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */ 1967 if(FLAC__stream_decoder_get_total_samples(decoder) > 0) { 1968 if(decoder->private_->samples_decoded >= FLAC__stream_decoder_get_total_samples(decoder)) { 1969 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM; 1970 return true; 1971 } 1972 } 1973 1974 /* make sure we're byte aligned */ 1975 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) { 1976 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input))) 1977 return false; /* read_callback_ sets the state for us */ 1978 } 1979 1980 while(1) { 1981 if(decoder->private_->cached) { 1982 x = (FLAC__uint32)decoder->private_->lookahead; 1983 decoder->private_->cached = false; 1984 } 1985 else { 1986 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 1987 return false; /* read_callback_ sets the state for us */ 1988 } 1989 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */ 1990 decoder->private_->header_warmup[0] = (FLAC__byte)x; 1991 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 1992 return false; /* read_callback_ sets the state for us */ 1993 1994 /* 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 */ 1995 /* else we have to check if the second byte is the end of a sync code */ 1996 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */ 1997 decoder->private_->lookahead = (FLAC__byte)x; 1998 decoder->private_->cached = true; 1999 } 2000 else if(x >> 1 == 0x7c) { /* MAGIC NUMBER for the last 6 sync bits and reserved 7th bit */ 2001 decoder->private_->header_warmup[1] = (FLAC__byte)x; 2002 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME; 2003 return true; 2004 } 2005 } 2006 if(first) { 2007 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 2008 first = false; 2009 } 2010 } 2011 2012 return true; 2013 } 2014 2015 FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode) 2016 { 2017 unsigned channel; 2018 unsigned i; 2019 FLAC__int32 mid, side; 2020 unsigned frame_crc; /* the one we calculate from the input stream */ 2021 FLAC__uint32 x; 2022 2023 *got_a_frame = false; 2024 2025 /* init the CRC */ 2026 frame_crc = 0; 2027 frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc); 2028 frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc); 2029 FLAC__bitreader_reset_read_crc16(decoder->private_->input, (FLAC__uint16)frame_crc); 2030 2031 if(!read_frame_header_(decoder)) 2032 return false; 2033 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means we didn't sync on a valid header */ 2034 return true; 2035 if(!allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels)) 2036 return false; 2037 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) { 2038 /* 2039 * first figure the correct bits-per-sample of the subframe 2040 */ 2041 unsigned bps = decoder->private_->frame.header.bits_per_sample; 2042 switch(decoder->private_->frame.header.channel_assignment) { 2043 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT: 2044 /* no adjustment needed */ 2045 break; 2046 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE: 2047 FLAC__ASSERT(decoder->private_->frame.header.channels == 2); 2048 if(channel == 1) 2049 bps++; 2050 break; 2051 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE: 2052 FLAC__ASSERT(decoder->private_->frame.header.channels == 2); 2053 if(channel == 0) 2054 bps++; 2055 break; 2056 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE: 2057 FLAC__ASSERT(decoder->private_->frame.header.channels == 2); 2058 if(channel == 1) 2059 bps++; 2060 break; 2061 default: 2062 FLAC__ASSERT(0); 2063 } 2064 /* 2065 * now read it 2066 */ 2067 if(!read_subframe_(decoder, channel, bps, do_full_decode)) 2068 return false; 2069 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */ 2070 return true; 2071 } 2072 if(!read_zero_padding_(decoder)) 2073 return false; 2074 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) */ 2075 return true; 2076 2077 /* 2078 * Read the frame CRC-16 from the footer and check 2079 */ 2080 frame_crc = FLAC__bitreader_get_read_crc16(decoder->private_->input); 2081 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN)) 2082 return false; /* read_callback_ sets the state for us */ 2083 if(frame_crc == x) { 2084 if(do_full_decode) { 2085 /* Undo any special channel coding */ 2086 switch(decoder->private_->frame.header.channel_assignment) { 2087 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT: 2088 /* do nothing */ 2089 break; 2090 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE: 2091 FLAC__ASSERT(decoder->private_->frame.header.channels == 2); 2092 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) 2093 decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i]; 2094 break; 2095 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE: 2096 FLAC__ASSERT(decoder->private_->frame.header.channels == 2); 2097 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) 2098 decoder->private_->output[0][i] += decoder->private_->output[1][i]; 2099 break; 2100 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE: 2101 FLAC__ASSERT(decoder->private_->frame.header.channels == 2); 2102 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) { 2103 #if 1 2104 mid = decoder->private_->output[0][i]; 2105 side = decoder->private_->output[1][i]; 2106 mid = ((uint32_t) mid) << 1; 2107 mid |= (side & 1); /* i.e. if 'side' is odd... */ 2108 decoder->private_->output[0][i] = (mid + side) >> 1; 2109 decoder->private_->output[1][i] = (mid - side) >> 1; 2110 #else 2111 /* OPT: without 'side' temp variable */ 2112 mid = (decoder->private_->output[0][i] << 1) | (decoder->private_->output[1][i] & 1); /* i.e. if 'side' is odd... */ 2113 decoder->private_->output[0][i] = (mid + decoder->private_->output[1][i]) >> 1; 2114 decoder->private_->output[1][i] = (mid - decoder->private_->output[1][i]) >> 1; 2115 #endif 2116 } 2117 break; 2118 default: 2119 FLAC__ASSERT(0); 2120 break; 2121 } 2122 } 2123 } 2124 else { 2125 /* Bad frame, emit error and zero the output signal */ 2126 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH); 2127 if(do_full_decode) { 2128 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) { 2129 memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize); 2130 } 2131 } 2132 } 2133 2134 *got_a_frame = true; 2135 2136 /* we wait to update fixed_block_size until here, when we're sure we've got a proper frame and hence a correct blocksize */ 2137 if(decoder->private_->next_fixed_block_size) 2138 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size; 2139 2140 /* put the latest values into the public section of the decoder instance */ 2141 decoder->protected_->channels = decoder->private_->frame.header.channels; 2142 decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment; 2143 decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample; 2144 decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate; 2145 decoder->protected_->blocksize = decoder->private_->frame.header.blocksize; 2146 2147 FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); 2148 decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize; 2149 2150 /* write it */ 2151 if(do_full_decode) { 2152 if(write_audio_frame_to_client_(decoder, &decoder->private_->frame, (const FLAC__int32 * const *)decoder->private_->output) != FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE) { 2153 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED; 2154 return false; 2155 } 2156 } 2157 2158 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2159 return true; 2160 } 2161 2162 FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder) 2163 { 2164 FLAC__uint32 x; 2165 FLAC__uint64 xx; 2166 unsigned i, blocksize_hint = 0, sample_rate_hint = 0; 2167 FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */ 2168 unsigned raw_header_len; 2169 FLAC__bool is_unparseable = false; 2170 2171 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); 2172 2173 /* init the raw header with the saved bits from synchronization */ 2174 raw_header[0] = decoder->private_->header_warmup[0]; 2175 raw_header[1] = decoder->private_->header_warmup[1]; 2176 raw_header_len = 2; 2177 2178 /* check to make sure that reserved bit is 0 */ 2179 if(raw_header[1] & 0x02) /* MAGIC NUMBER */ 2180 is_unparseable = true; 2181 2182 /* 2183 * Note that along the way as we read the header, we look for a sync 2184 * code inside. If we find one it would indicate that our original 2185 * sync was bad since there cannot be a sync code in a valid header. 2186 * 2187 * Three kinds of things can go wrong when reading the frame header: 2188 * 1) We may have sync'ed incorrectly and not landed on a frame header. 2189 * If we don't find a sync code, it can end up looking like we read 2190 * a valid but unparseable header, until getting to the frame header 2191 * CRC. Even then we could get a false positive on the CRC. 2192 * 2) We may have sync'ed correctly but on an unparseable frame (from a 2193 * future encoder). 2194 * 3) We may be on a damaged frame which appears valid but unparseable. 2195 * 2196 * For all these reasons, we try and read a complete frame header as 2197 * long as it seems valid, even if unparseable, up until the frame 2198 * header CRC. 2199 */ 2200 2201 /* 2202 * read in the raw header as bytes so we can CRC it, and parse it on the way 2203 */ 2204 for(i = 0; i < 2; i++) { 2205 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 2206 return false; /* read_callback_ sets the state for us */ 2207 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */ 2208 /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */ 2209 decoder->private_->lookahead = (FLAC__byte)x; 2210 decoder->private_->cached = true; 2211 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER); 2212 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2213 return true; 2214 } 2215 raw_header[raw_header_len++] = (FLAC__byte)x; 2216 } 2217 2218 switch(x = raw_header[2] >> 4) { 2219 case 0: 2220 is_unparseable = true; 2221 break; 2222 case 1: 2223 decoder->private_->frame.header.blocksize = 192; 2224 break; 2225 case 2: 2226 case 3: 2227 case 4: 2228 case 5: 2229 decoder->private_->frame.header.blocksize = 576 << (x-2); 2230 break; 2231 case 6: 2232 case 7: 2233 blocksize_hint = x; 2234 break; 2235 case 8: 2236 case 9: 2237 case 10: 2238 case 11: 2239 case 12: 2240 case 13: 2241 case 14: 2242 case 15: 2243 decoder->private_->frame.header.blocksize = 256 << (x-8); 2244 break; 2245 default: 2246 FLAC__ASSERT(0); 2247 break; 2248 } 2249 2250 switch(x = raw_header[2] & 0x0f) { 2251 case 0: 2252 if(decoder->private_->has_stream_info) 2253 decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate; 2254 else 2255 is_unparseable = true; 2256 break; 2257 case 1: 2258 decoder->private_->frame.header.sample_rate = 88200; 2259 break; 2260 case 2: 2261 decoder->private_->frame.header.sample_rate = 176400; 2262 break; 2263 case 3: 2264 decoder->private_->frame.header.sample_rate = 192000; 2265 break; 2266 case 4: 2267 decoder->private_->frame.header.sample_rate = 8000; 2268 break; 2269 case 5: 2270 decoder->private_->frame.header.sample_rate = 16000; 2271 break; 2272 case 6: 2273 decoder->private_->frame.header.sample_rate = 22050; 2274 break; 2275 case 7: 2276 decoder->private_->frame.header.sample_rate = 24000; 2277 break; 2278 case 8: 2279 decoder->private_->frame.header.sample_rate = 32000; 2280 break; 2281 case 9: 2282 decoder->private_->frame.header.sample_rate = 44100; 2283 break; 2284 case 10: 2285 decoder->private_->frame.header.sample_rate = 48000; 2286 break; 2287 case 11: 2288 decoder->private_->frame.header.sample_rate = 96000; 2289 break; 2290 case 12: 2291 case 13: 2292 case 14: 2293 sample_rate_hint = x; 2294 break; 2295 case 15: 2296 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER); 2297 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2298 return true; 2299 default: 2300 FLAC__ASSERT(0); 2301 } 2302 2303 x = (unsigned)(raw_header[3] >> 4); 2304 if(x & 8) { 2305 decoder->private_->frame.header.channels = 2; 2306 switch(x & 7) { 2307 case 0: 2308 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE; 2309 break; 2310 case 1: 2311 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE; 2312 break; 2313 case 2: 2314 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE; 2315 break; 2316 default: 2317 is_unparseable = true; 2318 break; 2319 } 2320 } 2321 else { 2322 decoder->private_->frame.header.channels = (unsigned)x + 1; 2323 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT; 2324 } 2325 2326 switch(x = (unsigned)(raw_header[3] & 0x0e) >> 1) { 2327 case 0: 2328 if(decoder->private_->has_stream_info) 2329 decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample; 2330 else 2331 is_unparseable = true; 2332 break; 2333 case 1: 2334 decoder->private_->frame.header.bits_per_sample = 8; 2335 break; 2336 case 2: 2337 decoder->private_->frame.header.bits_per_sample = 12; 2338 break; 2339 case 4: 2340 decoder->private_->frame.header.bits_per_sample = 16; 2341 break; 2342 case 5: 2343 decoder->private_->frame.header.bits_per_sample = 20; 2344 break; 2345 case 6: 2346 decoder->private_->frame.header.bits_per_sample = 24; 2347 break; 2348 case 3: 2349 case 7: 2350 is_unparseable = true; 2351 break; 2352 default: 2353 FLAC__ASSERT(0); 2354 break; 2355 } 2356 2357 /* check to make sure that reserved bit is 0 */ 2358 if(raw_header[3] & 0x01) /* MAGIC NUMBER */ 2359 is_unparseable = true; 2360 2361 /* read the frame's starting sample number (or frame number as the case may be) */ 2362 if( 2363 raw_header[1] & 0x01 || 2364 /*@@@ 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 */ 2365 (decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.min_blocksize != decoder->private_->stream_info.data.stream_info.max_blocksize) 2366 ) { /* variable blocksize */ 2367 if(!FLAC__bitreader_read_utf8_uint64(decoder->private_->input, &xx, raw_header, &raw_header_len)) 2368 return false; /* read_callback_ sets the state for us */ 2369 if(xx == FLAC__U64L(0xffffffffffffffff)) { /* i.e. non-UTF8 code... */ 2370 decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */ 2371 decoder->private_->cached = true; 2372 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER); 2373 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2374 return true; 2375 } 2376 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER; 2377 decoder->private_->frame.header.number.sample_number = xx; 2378 } 2379 else { /* fixed blocksize */ 2380 if(!FLAC__bitreader_read_utf8_uint32(decoder->private_->input, &x, raw_header, &raw_header_len)) 2381 return false; /* read_callback_ sets the state for us */ 2382 if(x == 0xffffffff) { /* i.e. non-UTF8 code... */ 2383 decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */ 2384 decoder->private_->cached = true; 2385 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER); 2386 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2387 return true; 2388 } 2389 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER; 2390 decoder->private_->frame.header.number.frame_number = x; 2391 } 2392 2393 if(blocksize_hint) { 2394 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 2395 return false; /* read_callback_ sets the state for us */ 2396 raw_header[raw_header_len++] = (FLAC__byte)x; 2397 if(blocksize_hint == 7) { 2398 FLAC__uint32 _x; 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 x = (x << 8) | _x; 2403 } 2404 decoder->private_->frame.header.blocksize = x+1; 2405 } 2406 2407 if(sample_rate_hint) { 2408 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 2409 return false; /* read_callback_ sets the state for us */ 2410 raw_header[raw_header_len++] = (FLAC__byte)x; 2411 if(sample_rate_hint != 12) { 2412 FLAC__uint32 _x; 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 x = (x << 8) | _x; 2417 } 2418 if(sample_rate_hint == 12) 2419 decoder->private_->frame.header.sample_rate = x*1000; 2420 else if(sample_rate_hint == 13) 2421 decoder->private_->frame.header.sample_rate = x; 2422 else 2423 decoder->private_->frame.header.sample_rate = x*10; 2424 } 2425 2426 /* read the CRC-8 byte */ 2427 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) 2428 return false; /* read_callback_ sets the state for us */ 2429 crc8 = (FLAC__byte)x; 2430 2431 if(FLAC__crc8(raw_header, raw_header_len) != crc8) { 2432 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER); 2433 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2434 return true; 2435 } 2436 2437 /* calculate the sample number from the frame number if needed */ 2438 decoder->private_->next_fixed_block_size = 0; 2439 if(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER) { 2440 x = decoder->private_->frame.header.number.frame_number; 2441 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER; 2442 if(decoder->private_->fixed_block_size) 2443 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->fixed_block_size * (FLAC__uint64)x; 2444 else if(decoder->private_->has_stream_info) { 2445 if(decoder->private_->stream_info.data.stream_info.min_blocksize == decoder->private_->stream_info.data.stream_info.max_blocksize) { 2446 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__uint64)x; 2447 decoder->private_->next_fixed_block_size = decoder->private_->stream_info.data.stream_info.max_blocksize; 2448 } 2449 else 2450 is_unparseable = true; 2451 } 2452 else if(x == 0) { 2453 decoder->private_->frame.header.number.sample_number = 0; 2454 decoder->private_->next_fixed_block_size = decoder->private_->frame.header.blocksize; 2455 } 2456 else { 2457 /* can only get here if the stream has invalid frame numbering and no STREAMINFO, so assume it's not the last (possibly short) frame */ 2458 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->frame.header.blocksize * (FLAC__uint64)x; 2459 } 2460 } 2461 2462 if(is_unparseable) { 2463 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM); 2464 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2465 return true; 2466 } 2467 2468 return true; 2469 } 2470 2471 FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode) 2472 { 2473 FLAC__uint32 x; 2474 FLAC__bool wasted_bits; 2475 unsigned i; 2476 2477 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) /* MAGIC NUMBER */ 2478 return false; /* read_callback_ sets the state for us */ 2479 2480 wasted_bits = (x & 1); 2481 x &= 0xfe; 2482 2483 if(wasted_bits) { 2484 unsigned u; 2485 if(!FLAC__bitreader_read_unary_unsigned(decoder->private_->input, &u)) 2486 return false; /* read_callback_ sets the state for us */ 2487 decoder->private_->frame.subframes[channel].wasted_bits = u+1; 2488 if (decoder->private_->frame.subframes[channel].wasted_bits >= bps) 2489 return false; 2490 bps -= decoder->private_->frame.subframes[channel].wasted_bits; 2491 } 2492 else 2493 decoder->private_->frame.subframes[channel].wasted_bits = 0; 2494 2495 /* 2496 * Lots of magic numbers here 2497 */ 2498 if(x & 0x80) { 2499 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 2500 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2501 return true; 2502 } 2503 else if(x == 0) { 2504 if(!read_subframe_constant_(decoder, channel, bps, do_full_decode)) 2505 return false; 2506 } 2507 else if(x == 2) { 2508 if(!read_subframe_verbatim_(decoder, channel, bps, do_full_decode)) 2509 return false; 2510 } 2511 else if(x < 16) { 2512 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM); 2513 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2514 return true; 2515 } 2516 else if(x <= 24) { 2517 if(!read_subframe_fixed_(decoder, channel, bps, (x>>1)&7, do_full_decode)) 2518 return false; 2519 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */ 2520 return true; 2521 } 2522 else if(x < 64) { 2523 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM); 2524 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2525 return true; 2526 } 2527 else { 2528 if(!read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1, do_full_decode)) 2529 return false; 2530 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */ 2531 return true; 2532 } 2533 2534 if(wasted_bits && do_full_decode) { 2535 x = decoder->private_->frame.subframes[channel].wasted_bits; 2536 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) { 2537 uint32_t val = decoder->private_->output[channel][i]; 2538 decoder->private_->output[channel][i] = (val << x); 2539 } 2540 } 2541 2542 return true; 2543 } 2544 2545 FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode) 2546 { 2547 FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant; 2548 FLAC__int32 x; 2549 unsigned i; 2550 FLAC__int32 *output = decoder->private_->output[channel]; 2551 2552 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT; 2553 2554 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps)) 2555 return false; /* read_callback_ sets the state for us */ 2556 2557 subframe->value = x; 2558 2559 /* decode the subframe */ 2560 if(do_full_decode) { 2561 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) 2562 output[i] = x; 2563 } 2564 2565 return true; 2566 } 2567 2568 FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode) 2569 { 2570 FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed; 2571 FLAC__int32 i32; 2572 FLAC__uint32 u32; 2573 unsigned u; 2574 2575 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED; 2576 2577 subframe->residual = decoder->private_->residual[channel]; 2578 subframe->order = order; 2579 2580 /* read warm-up samples */ 2581 for(u = 0; u < order; u++) { 2582 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps)) 2583 return false; /* read_callback_ sets the state for us */ 2584 subframe->warmup[u] = i32; 2585 } 2586 2587 /* read entropy coding method info */ 2588 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN)) 2589 return false; /* read_callback_ sets the state for us */ 2590 subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32; 2591 switch(subframe->entropy_coding_method.type) { 2592 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE: 2593 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2: 2594 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN)) 2595 return false; /* read_callback_ sets the state for us */ 2596 if(decoder->private_->frame.header.blocksize >> u32 < order) { 2597 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 2598 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2599 return true; 2600 } 2601 subframe->entropy_coding_method.data.partitioned_rice.order = u32; 2602 subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel]; 2603 break; 2604 default: 2605 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM); 2606 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2607 return true; 2608 } 2609 2610 /* read residual */ 2611 switch(subframe->entropy_coding_method.type) { 2612 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE: 2613 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2: 2614 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)) 2615 return false; 2616 break; 2617 default: 2618 FLAC__ASSERT(0); 2619 } 2620 2621 /* decode the subframe */ 2622 if(do_full_decode) { 2623 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order); 2624 FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order); 2625 } 2626 2627 return true; 2628 } 2629 2630 FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode) 2631 { 2632 FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc; 2633 FLAC__int32 i32; 2634 FLAC__uint32 u32; 2635 unsigned u; 2636 2637 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC; 2638 2639 subframe->residual = decoder->private_->residual[channel]; 2640 subframe->order = order; 2641 2642 /* read warm-up samples */ 2643 for(u = 0; u < order; u++) { 2644 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps)) 2645 return false; /* read_callback_ sets the state for us */ 2646 subframe->warmup[u] = i32; 2647 } 2648 2649 /* read qlp coeff precision */ 2650 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN)) 2651 return false; /* read_callback_ sets the state for us */ 2652 if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) { 2653 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 2654 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2655 return true; 2656 } 2657 subframe->qlp_coeff_precision = u32+1; 2658 2659 /* read qlp shift */ 2660 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN)) 2661 return false; /* read_callback_ sets the state for us */ 2662 if(i32 < 0) { 2663 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 2664 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2665 return true; 2666 } 2667 subframe->quantization_level = i32; 2668 2669 /* read quantized lp coefficiencts */ 2670 for(u = 0; u < order; u++) { 2671 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision)) 2672 return false; /* read_callback_ sets the state for us */ 2673 subframe->qlp_coeff[u] = i32; 2674 } 2675 2676 /* read entropy coding method info */ 2677 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN)) 2678 return false; /* read_callback_ sets the state for us */ 2679 subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32; 2680 switch(subframe->entropy_coding_method.type) { 2681 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE: 2682 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2: 2683 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN)) 2684 return false; /* read_callback_ sets the state for us */ 2685 if(decoder->private_->frame.header.blocksize >> u32 < order) { 2686 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 2687 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2688 return true; 2689 } 2690 subframe->entropy_coding_method.data.partitioned_rice.order = u32; 2691 subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel]; 2692 break; 2693 default: 2694 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM); 2695 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2696 return true; 2697 } 2698 2699 /* read residual */ 2700 switch(subframe->entropy_coding_method.type) { 2701 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE: 2702 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2: 2703 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)) 2704 return false; 2705 break; 2706 default: 2707 FLAC__ASSERT(0); 2708 } 2709 2710 /* decode the subframe */ 2711 if(do_full_decode) { 2712 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order); 2713 if(bps + subframe->qlp_coeff_precision + FLAC__bitmath_ilog2(order) <= 32) 2714 if(bps <= 16 && subframe->qlp_coeff_precision <= 16) 2715 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); 2716 else 2717 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); 2718 else 2719 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); 2720 } 2721 2722 return true; 2723 } 2724 2725 FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode) 2726 { 2727 FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim; 2728 FLAC__int32 x, *residual = decoder->private_->residual[channel]; 2729 unsigned i; 2730 2731 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM; 2732 2733 subframe->data = residual; 2734 2735 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) { 2736 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps)) 2737 return false; /* read_callback_ sets the state for us */ 2738 residual[i] = x; 2739 } 2740 2741 /* decode the subframe */ 2742 if(do_full_decode) 2743 memcpy(decoder->private_->output[channel], subframe->data, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize); 2744 2745 return true; 2746 } 2747 2748 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) 2749 { 2750 FLAC__uint32 rice_parameter; 2751 int i; 2752 unsigned partition, sample, u; 2753 const unsigned partitions = 1u << partition_order; 2754 const unsigned partition_samples = partition_order > 0? decoder->private_->frame.header.blocksize >> partition_order : decoder->private_->frame.header.blocksize - predictor_order; 2755 const unsigned plen = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_PARAMETER_LEN : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN; 2756 const unsigned pesc = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_ESCAPE_PARAMETER : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER; 2757 2758 /* invalid predictor and partition orders mush be handled in the callers */ 2759 FLAC__ASSERT(partition_order > 0? partition_samples >= predictor_order : decoder->private_->frame.header.blocksize >= predictor_order); 2760 2761 if(!FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(partitioned_rice_contents, flac_max(6u, partition_order))) { 2762 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; 2763 return false; 2764 } 2765 2766 sample = 0; 2767 for(partition = 0; partition < partitions; partition++) { 2768 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, plen)) 2769 return false; /* read_callback_ sets the state for us */ 2770 partitioned_rice_contents->parameters[partition] = rice_parameter; 2771 if(rice_parameter < pesc) { 2772 partitioned_rice_contents->raw_bits[partition] = 0; 2773 u = (partition_order == 0 || partition > 0)? partition_samples : partition_samples - predictor_order; 2774 if(!FLAC__bitreader_read_rice_signed_block(decoder->private_->input, residual + sample, u, rice_parameter)) 2775 return false; /* read_callback_ sets the state for us */ 2776 sample += u; 2777 } 2778 else { 2779 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN)) 2780 return false; /* read_callback_ sets the state for us */ 2781 partitioned_rice_contents->raw_bits[partition] = rice_parameter; 2782 for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) { 2783 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i, rice_parameter)) 2784 return false; /* read_callback_ sets the state for us */ 2785 residual[sample] = i; 2786 } 2787 } 2788 } 2789 2790 return true; 2791 } 2792 2793 FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder) 2794 { 2795 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) { 2796 FLAC__uint32 zero = 0; 2797 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &zero, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input))) 2798 return false; /* read_callback_ sets the state for us */ 2799 if(zero != 0) { 2800 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); 2801 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; 2802 } 2803 } 2804 return true; 2805 } 2806 2807 FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data) 2808 { 2809 FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data; 2810 2811 if( 2812 #if FLAC__HAS_OGG 2813 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */ 2814 !decoder->private_->is_ogg && 2815 #endif 2816 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data) 2817 ) { 2818 *bytes = 0; 2819 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM; 2820 return false; 2821 } 2822 else if(*bytes > 0) { 2823 /* While seeking, it is possible for our seek to land in the 2824 * middle of audio data that looks exactly like a frame header 2825 * from a future version of an encoder. When that happens, our 2826 * error callback will get an 2827 * FLAC__STREAM_DECODER_UNPARSEABLE_STREAM and increment its 2828 * unparseable_frame_count. But there is a remote possibility 2829 * that it is properly synced at such a "future-codec frame", 2830 * so to make sure, we wait to see many "unparseable" errors in 2831 * a row before bailing out. 2832 */ 2833 if(decoder->private_->is_seeking && decoder->private_->unparseable_frame_count > 20) { 2834 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED; 2835 return false; 2836 } 2837 else { 2838 const FLAC__StreamDecoderReadStatus status = 2839 #if FLAC__HAS_OGG 2840 decoder->private_->is_ogg? 2841 read_callback_ogg_aspect_(decoder, buffer, bytes) : 2842 #endif 2843 decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data) 2844 ; 2845 if(status == FLAC__STREAM_DECODER_READ_STATUS_ABORT) { 2846 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED; 2847 return false; 2848 } 2849 else if(*bytes == 0) { 2850 if( 2851 status == FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM || 2852 ( 2853 #if FLAC__HAS_OGG 2854 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */ 2855 !decoder->private_->is_ogg && 2856 #endif 2857 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data) 2858 ) 2859 ) { 2860 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM; 2861 return false; 2862 } 2863 else 2864 return true; 2865 } 2866 else 2867 return true; 2868 } 2869 } 2870 else { 2871 /* abort to avoid a deadlock */ 2872 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED; 2873 return false; 2874 } 2875 /* [1] @@@ HACK NOTE: The end-of-stream checking has to be hacked around 2876 * for Ogg FLAC. This is because the ogg decoder aspect can lose sync 2877 * and at the same time hit the end of the stream (for example, seeking 2878 * to a point that is after the beginning of the last Ogg page). There 2879 * is no way to report an Ogg sync loss through the callbacks (see note 2880 * in read_callback_ogg_aspect_()) so it returns CONTINUE with *bytes==0. 2881 * So to keep the decoder from stopping at this point we gate the call 2882 * to the eof_callback and let the Ogg decoder aspect set the 2883 * end-of-stream state when it is needed. 2884 */ 2885 } 2886 2887 #if FLAC__HAS_OGG 2888 FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes) 2889 { 2890 switch(FLAC__ogg_decoder_aspect_read_callback_wrapper(&decoder->protected_->ogg_decoder_aspect, buffer, bytes, read_callback_proxy_, decoder, decoder->private_->client_data)) { 2891 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK: 2892 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE; 2893 /* we don't really have a way to handle lost sync via read 2894 * callback so we'll let it pass and let the underlying 2895 * FLAC decoder catch the error 2896 */ 2897 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_LOST_SYNC: 2898 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE; 2899 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM: 2900 return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM; 2901 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_NOT_FLAC: 2902 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_UNSUPPORTED_MAPPING_VERSION: 2903 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT: 2904 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ERROR: 2905 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_MEMORY_ALLOCATION_ERROR: 2906 return FLAC__STREAM_DECODER_READ_STATUS_ABORT; 2907 default: 2908 FLAC__ASSERT(0); 2909 /* double protection */ 2910 return FLAC__STREAM_DECODER_READ_STATUS_ABORT; 2911 } 2912 } 2913 2914 FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data) 2915 { 2916 FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder*)void_decoder; 2917 2918 switch(decoder->private_->read_callback(decoder, buffer, bytes, client_data)) { 2919 case FLAC__STREAM_DECODER_READ_STATUS_CONTINUE: 2920 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK; 2921 case FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM: 2922 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM; 2923 case FLAC__STREAM_DECODER_READ_STATUS_ABORT: 2924 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT; 2925 default: 2926 /* double protection: */ 2927 FLAC__ASSERT(0); 2928 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT; 2929 } 2930 } 2931 #endif 2932 2933 FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[]) 2934 { 2935 if(decoder->private_->is_seeking) { 2936 FLAC__uint64 this_frame_sample = frame->header.number.sample_number; 2937 FLAC__uint64 next_frame_sample = this_frame_sample + (FLAC__uint64)frame->header.blocksize; 2938 FLAC__uint64 target_sample = decoder->private_->target_sample; 2939 2940 FLAC__ASSERT(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); 2941 2942 #if FLAC__HAS_OGG 2943 decoder->private_->got_a_frame = true; 2944 #endif 2945 decoder->private_->last_frame = *frame; /* save the frame */ 2946 if(this_frame_sample <= target_sample && target_sample < next_frame_sample) { /* we hit our target frame */ 2947 unsigned delta = (unsigned)(target_sample - this_frame_sample); 2948 /* kick out of seek mode */ 2949 decoder->private_->is_seeking = false; 2950 /* shift out the samples before target_sample */ 2951 if(delta > 0) { 2952 unsigned channel; 2953 const FLAC__int32 *newbuffer[FLAC__MAX_CHANNELS]; 2954 for(channel = 0; channel < frame->header.channels; channel++) 2955 newbuffer[channel] = buffer[channel] + delta; 2956 decoder->private_->last_frame.header.blocksize -= delta; 2957 decoder->private_->last_frame.header.number.sample_number += (FLAC__uint64)delta; 2958 /* write the relevant samples */ 2959 return decoder->private_->write_callback(decoder, &decoder->private_->last_frame, newbuffer, decoder->private_->client_data); 2960 } 2961 else { 2962 /* write the relevant samples */ 2963 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data); 2964 } 2965 } 2966 else { 2967 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; 2968 } 2969 } 2970 else { 2971 /* 2972 * If we never got STREAMINFO, turn off MD5 checking to save 2973 * cycles since we don't have a sum to compare to anyway 2974 */ 2975 if(!decoder->private_->has_stream_info) 2976 decoder->private_->do_md5_checking = false; 2977 if(decoder->private_->do_md5_checking) { 2978 if(!FLAC__MD5Accumulate(&decoder->private_->md5context, buffer, frame->header.channels, frame->header.blocksize, (frame->header.bits_per_sample+7) / 8)) 2979 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; 2980 } 2981 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data); 2982 } 2983 } 2984 2985 void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status) 2986 { 2987 if(!decoder->private_->is_seeking) 2988 decoder->private_->error_callback(decoder, status, decoder->private_->client_data); 2989 else if(status == FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM) 2990 decoder->private_->unparseable_frame_count++; 2991 } 2992 2993 FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample) 2994 { 2995 FLAC__uint64 first_frame_offset = decoder->private_->first_frame_offset, lower_bound, upper_bound, lower_bound_sample, upper_bound_sample, this_frame_sample; 2996 FLAC__int64 pos = -1; 2997 int i; 2998 unsigned approx_bytes_per_frame; 2999 FLAC__bool first_seek = true; 3000 const FLAC__uint64 total_samples = FLAC__stream_decoder_get_total_samples(decoder); 3001 const unsigned min_blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize; 3002 const unsigned max_blocksize = decoder->private_->stream_info.data.stream_info.max_blocksize; 3003 const unsigned max_framesize = decoder->private_->stream_info.data.stream_info.max_framesize; 3004 const unsigned min_framesize = decoder->private_->stream_info.data.stream_info.min_framesize; 3005 /* take these from the current frame in case they've changed mid-stream */ 3006 unsigned channels = FLAC__stream_decoder_get_channels(decoder); 3007 unsigned bps = FLAC__stream_decoder_get_bits_per_sample(decoder); 3008 const FLAC__StreamMetadata_SeekTable *seek_table = decoder->private_->has_seek_table? &decoder->private_->seek_table.data.seek_table : 0; 3009 3010 /* use values from stream info if we didn't decode a frame */ 3011 if(channels == 0) 3012 channels = decoder->private_->stream_info.data.stream_info.channels; 3013 if(bps == 0) 3014 bps = decoder->private_->stream_info.data.stream_info.bits_per_sample; 3015 3016 /* we are just guessing here */ 3017 if(max_framesize > 0) 3018 approx_bytes_per_frame = (max_framesize + min_framesize) / 2 + 1; 3019 /* 3020 * Check if it's a known fixed-blocksize stream. Note that though 3021 * the spec doesn't allow zeroes in the STREAMINFO block, we may 3022 * never get a STREAMINFO block when decoding so the value of 3023 * min_blocksize might be zero. 3024 */ 3025 else if(min_blocksize == max_blocksize && min_blocksize > 0) { 3026 /* note there are no () around 'bps/8' to keep precision up since it's an integer calulation */ 3027 approx_bytes_per_frame = min_blocksize * channels * bps/8 + 64; 3028 } 3029 else 3030 approx_bytes_per_frame = 4096 * channels * bps/8 + 64; 3031 3032 /* 3033 * First, we set an upper and lower bound on where in the 3034 * stream we will search. For now we assume the worst case 3035 * scenario, which is our best guess at the beginning of 3036 * the first frame and end of the stream. 3037 */ 3038 lower_bound = first_frame_offset; 3039 lower_bound_sample = 0; 3040 upper_bound = stream_length; 3041 upper_bound_sample = total_samples > 0 ? total_samples : target_sample /*estimate it*/; 3042 3043 /* 3044 * Now we refine the bounds if we have a seektable with 3045 * suitable points. Note that according to the spec they 3046 * must be ordered by ascending sample number. 3047 * 3048 * Note: to protect against invalid seek tables we will ignore points 3049 * that have frame_samples==0 or sample_number>=total_samples 3050 */ 3051 if(seek_table) { 3052 FLAC__uint64 new_lower_bound = lower_bound; 3053 FLAC__uint64 new_upper_bound = upper_bound; 3054 FLAC__uint64 new_lower_bound_sample = lower_bound_sample; 3055 FLAC__uint64 new_upper_bound_sample = upper_bound_sample; 3056 3057 /* find the closest seek point <= target_sample, if it exists */ 3058 for(i = (int)seek_table->num_points - 1; i >= 0; i--) { 3059 if( 3060 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER && 3061 seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */ 3062 (total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */ 3063 seek_table->points[i].sample_number <= target_sample 3064 ) 3065 break; 3066 } 3067 if(i >= 0) { /* i.e. we found a suitable seek point... */ 3068 new_lower_bound = first_frame_offset + seek_table->points[i].stream_offset; 3069 new_lower_bound_sample = seek_table->points[i].sample_number; 3070 } 3071 3072 /* find the closest seek point > target_sample, if it exists */ 3073 for(i = 0; i < (int)seek_table->num_points; i++) { 3074 if( 3075 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER && 3076 seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */ 3077 (total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */ 3078 seek_table->points[i].sample_number > target_sample 3079 ) 3080 break; 3081 } 3082 if(i < (int)seek_table->num_points) { /* i.e. we found a suitable seek point... */ 3083 new_upper_bound = first_frame_offset + seek_table->points[i].stream_offset; 3084 new_upper_bound_sample = seek_table->points[i].sample_number; 3085 } 3086 /* final protection against unsorted seek tables; keep original values if bogus */ 3087 if(new_upper_bound >= new_lower_bound) { 3088 lower_bound = new_lower_bound; 3089 upper_bound = new_upper_bound; 3090 lower_bound_sample = new_lower_bound_sample; 3091 upper_bound_sample = new_upper_bound_sample; 3092 } 3093 } 3094 3095 FLAC__ASSERT(upper_bound_sample >= lower_bound_sample); 3096 /* there are 2 insidious ways that the following equality occurs, which 3097 * we need to fix: 3098 * 1) total_samples is 0 (unknown) and target_sample is 0 3099 * 2) total_samples is 0 (unknown) and target_sample happens to be 3100 * exactly equal to the last seek point in the seek table; this 3101 * means there is no seek point above it, and upper_bound_samples 3102 * remains equal to the estimate (of target_samples) we made above 3103 * in either case it does not hurt to move upper_bound_sample up by 1 3104 */ 3105 if(upper_bound_sample == lower_bound_sample) 3106 upper_bound_sample++; 3107 3108 decoder->private_->target_sample = target_sample; 3109 while(1) { 3110 /* check if the bounds are still ok */ 3111 if (lower_bound_sample >= upper_bound_sample || lower_bound > upper_bound) { 3112 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3113 return false; 3114 } 3115 #ifndef FLAC__INTEGER_ONLY_LIBRARY 3116 pos = (FLAC__int64)lower_bound + (FLAC__int64)((double)(target_sample - lower_bound_sample) / (double)(upper_bound_sample - lower_bound_sample) * (double)(upper_bound - lower_bound)) - approx_bytes_per_frame; 3117 #else 3118 /* a little less accurate: */ 3119 if(upper_bound - lower_bound < 0xffffffff) 3120 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; 3121 else /* @@@ WATCHOUT, ~2TB limit */ 3122 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; 3123 #endif 3124 if(pos >= (FLAC__int64)upper_bound) 3125 pos = (FLAC__int64)upper_bound - 1; 3126 if(pos < (FLAC__int64)lower_bound) 3127 pos = (FLAC__int64)lower_bound; 3128 if(decoder->private_->seek_callback(decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) { 3129 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3130 return false; 3131 } 3132 if(!FLAC__stream_decoder_flush(decoder)) { 3133 /* above call sets the state for us */ 3134 return false; 3135 } 3136 /* Now we need to get a frame. First we need to reset our 3137 * unparseable_frame_count; if we get too many unparseable 3138 * frames in a row, the read callback will return 3139 * FLAC__STREAM_DECODER_READ_STATUS_ABORT, causing 3140 * FLAC__stream_decoder_process_single() to return false. 3141 */ 3142 decoder->private_->unparseable_frame_count = 0; 3143 if(!FLAC__stream_decoder_process_single(decoder) || 3144 decoder->protected_->state == FLAC__STREAM_DECODER_ABORTED) { 3145 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3146 return false; 3147 } 3148 /* our write callback will change the state when it gets to the target frame */ 3149 /* 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 */ 3150 #if 0 3151 /*@@@@@@ used to be the following; not clear if the check for end of stream is needed anymore */ 3152 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING && decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM) 3153 break; 3154 #endif 3155 if(!decoder->private_->is_seeking) 3156 break; 3157 3158 FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); 3159 this_frame_sample = decoder->private_->last_frame.header.number.sample_number; 3160 3161 if (0 == decoder->private_->samples_decoded || (this_frame_sample + decoder->private_->last_frame.header.blocksize >= upper_bound_sample && !first_seek)) { 3162 if (pos == (FLAC__int64)lower_bound) { 3163 /* can't move back any more than the first frame, something is fatally wrong */ 3164 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3165 return false; 3166 } 3167 /* our last move backwards wasn't big enough, try again */ 3168 approx_bytes_per_frame = approx_bytes_per_frame? approx_bytes_per_frame * 2 : 16; 3169 continue; 3170 } 3171 /* allow one seek over upper bound, so we can get a correct upper_bound_sample for streams with unknown total_samples */ 3172 first_seek = false; 3173 3174 /* make sure we are not seeking in corrupted stream */ 3175 if (this_frame_sample < lower_bound_sample) { 3176 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3177 return false; 3178 } 3179 3180 /* we need to narrow the search */ 3181 if(target_sample < this_frame_sample) { 3182 upper_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize; 3183 /*@@@@@@ what will decode position be if at end of stream? */ 3184 if(!FLAC__stream_decoder_get_decode_position(decoder, &upper_bound)) { 3185 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3186 return false; 3187 } 3188 approx_bytes_per_frame = (unsigned)(2 * (upper_bound - pos) / 3 + 16); 3189 } 3190 else { /* target_sample >= this_frame_sample + this frame's blocksize */ 3191 lower_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize; 3192 if(!FLAC__stream_decoder_get_decode_position(decoder, &lower_bound)) { 3193 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3194 return false; 3195 } 3196 approx_bytes_per_frame = (unsigned)(2 * (lower_bound - pos) / 3 + 16); 3197 } 3198 } 3199 3200 return true; 3201 } 3202 3203 #if FLAC__HAS_OGG 3204 FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample) 3205 { 3206 FLAC__uint64 left_pos = 0, right_pos = stream_length; 3207 FLAC__uint64 left_sample = 0, right_sample = FLAC__stream_decoder_get_total_samples(decoder); 3208 FLAC__uint64 this_frame_sample = (FLAC__uint64)0 - 1; 3209 FLAC__uint64 pos = 0; /* only initialized to avoid compiler warning */ 3210 FLAC__bool did_a_seek; 3211 unsigned iteration = 0; 3212 3213 /* In the first iterations, we will calculate the target byte position 3214 * by the distance from the target sample to left_sample and 3215 * right_sample (let's call it "proportional search"). After that, we 3216 * will switch to binary search. 3217 */ 3218 unsigned BINARY_SEARCH_AFTER_ITERATION = 2; 3219 3220 /* We will switch to a linear search once our current sample is less 3221 * than this number of samples ahead of the target sample 3222 */ 3223 static const FLAC__uint64 LINEAR_SEARCH_WITHIN_SAMPLES = FLAC__MAX_BLOCK_SIZE * 2; 3224 3225 /* If the total number of samples is unknown, use a large value, and 3226 * force binary search immediately. 3227 */ 3228 if(right_sample == 0) { 3229 right_sample = (FLAC__uint64)(-1); 3230 BINARY_SEARCH_AFTER_ITERATION = 0; 3231 } 3232 3233 decoder->private_->target_sample = target_sample; 3234 for( ; ; iteration++) { 3235 if (iteration == 0 || this_frame_sample > target_sample || target_sample - this_frame_sample > LINEAR_SEARCH_WITHIN_SAMPLES) { 3236 if (iteration >= BINARY_SEARCH_AFTER_ITERATION) { 3237 pos = (right_pos + left_pos) / 2; 3238 } 3239 else { 3240 #ifndef FLAC__INTEGER_ONLY_LIBRARY 3241 pos = (FLAC__uint64)((double)(target_sample - left_sample) / (double)(right_sample - left_sample) * (double)(right_pos - left_pos)); 3242 #else 3243 /* a little less accurate: */ 3244 if ((target_sample-left_sample <= 0xffffffff) && (right_pos-left_pos <= 0xffffffff)) 3245 pos = (FLAC__int64)(((target_sample-left_sample) * (right_pos-left_pos)) / (right_sample-left_sample)); 3246 else /* @@@ WATCHOUT, ~2TB limit */ 3247 pos = (FLAC__int64)((((target_sample-left_sample)>>8) * ((right_pos-left_pos)>>8)) / ((right_sample-left_sample)>>16)); 3248 #endif 3249 /* @@@ TODO: might want to limit pos to some distance 3250 * before EOF, to make sure we land before the last frame, 3251 * thereby getting a this_frame_sample and so having a better 3252 * estimate. 3253 */ 3254 } 3255 3256 /* physical seek */ 3257 if(decoder->private_->seek_callback((FLAC__StreamDecoder*)decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) { 3258 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; 3259 return false; 3260 } 3261 if(!FLAC__stream_decoder_flush(decoder)) { 3262 /* above call sets the state for us */ 3263 return false; 3264 } 3265 did_a_seek = true; 3266 } 3267 else 3268 did_a_seek = false; 3269 3270 decoder->private_->got_a_frame = false; 3271 if(!FLAC__stream_decoder_process_single(decoder) || 3272 decoder->protected_->state == FLAC__STREAM_DECODER_ABORTED) { 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
