| 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 | #ifdef __CELLOS_LV2__ |
| 3360 | else if(fseek(decoder->private_->file, (FLAC__off_t)absolute_byte_offset, SEEK_SET) < 0) |
| 3361 | #else |
| 3362 | else if(fseeko(decoder->private_->file, (FLAC__off_t)absolute_byte_offset, SEEK_SET) < 0) |
| 3363 | #endif |
| 3364 | return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR; |
| 3365 | else |
| 3366 | return FLAC__STREAM_DECODER_SEEK_STATUS_OK; |
| 3367 | } |
| 3368 | |
| 3369 | FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data) |
| 3370 | { |
| 3371 | FLAC__off_t pos; |
| 3372 | (void)client_data; |
| 3373 | |
| 3374 | if(decoder->private_->file == stdin) |
| 3375 | return FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED; |
| 3376 | #ifdef __CELLOS_LV2__ |
| 3377 | else if((pos = ftell(decoder->private_->file)) < 0) |
| 3378 | #else |
| 3379 | else if((pos = ftello(decoder->private_->file)) < 0) |
| 3380 | #endif |
| 3381 | return FLAC__STREAM_DECODER_TELL_STATUS_ERROR; |
| 3382 | else { |
| 3383 | *absolute_byte_offset = (FLAC__uint64)pos; |
| 3384 | return FLAC__STREAM_DECODER_TELL_STATUS_OK; |
| 3385 | } |
| 3386 | } |
| 3387 | |
| 3388 | FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data) |
| 3389 | { |
| 3390 | struct flac_stat_s filestats; |
| 3391 | (void)client_data; |
| 3392 | |
| 3393 | if(decoder->private_->file == stdin) |
| 3394 | return FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED; |
| 3395 | else if(flac_fstat(fileno(decoder->private_->file), &filestats) != 0) |
| 3396 | return FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR; |
| 3397 | else { |
| 3398 | *stream_length = (FLAC__uint64)filestats.st_size; |
| 3399 | return FLAC__STREAM_DECODER_LENGTH_STATUS_OK; |
| 3400 | } |
| 3401 | } |
| 3402 | |
| 3403 | FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data) |
| 3404 | { |
| 3405 | (void)client_data; |
| 3406 | |
| 3407 | return feof(decoder->private_->file)? true : false; |
| 3408 | } |