1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2000,2001,2002,2003,2004,2005,2006,2007 Josh Coalson
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * - Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * - Neither the name of the Xiph.org Foundation nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 #if defined _MSC_VER || defined __MINGW32__
37 #include <io.h> /* for _setmode() */
38 #include <fcntl.h> /* for _O_BINARY */
40 #if defined __CYGWIN__ || defined __EMX__
41 #include <io.h> /* for setmode(), O_BINARY */
42 #include <fcntl.h> /* for _O_BINARY */
45 #include <stdlib.h> /* for malloc() */
46 #include <string.h> /* for memset/memcpy() */
47 #include <sys/stat.h> /* for stat() */
48 #include <sys/types.h> /* for off_t */
49 #if defined _MSC_VER || defined __BORLANDC__ || defined __MINGW32__
50 #if _MSC_VER <= 1600 || defined __BORLANDC__ /* @@@ [2G limit] */
55 #include "FLAC/assert.h"
56 #include "protected/stream_decoder.h"
57 #include "private/bitreader.h"
58 #include "private/bitmath.h"
59 #include "private/cpu.h"
60 #include "private/crc.h"
61 #include "private/fixed.h"
62 #include "private/format.h"
63 #include "private/lpc.h"
64 #include "private/md5.h"
65 #include "private/memory.h"
70 #define max(a,b) ((a)>(b)?(a):(b))
72 /* adjust for compilers that can't understand using LLU suffix for uint64_t literals */
74 #define FLAC__U64L(x) x
76 #define FLAC__U64L(x) x##LLU
80 /* technically this should be in an "export.c" but this is convenient enough */
81 FLAC_API int FLAC_API_SUPPORTS_OGG_FLAC =
90 /***********************************************************************
94 ***********************************************************************/
96 static FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' };
98 /***********************************************************************
100 * Private class method prototypes
102 ***********************************************************************/
104 static void set_defaults_(FLAC__StreamDecoder *decoder);
105 static FILE *get_binary_stdin_(void);
106 static FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels);
107 static FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id);
108 static FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder);
109 static FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder);
110 static FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length);
111 static FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length);
112 static FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj);
113 static FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj);
114 static FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj);
115 static FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder);
116 static FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder);
117 static FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode);
118 static FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder);
119 static FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode);
120 static FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode);
121 static FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode);
122 static FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode);
123 static FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode);
124 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);
125 static FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder);
126 static FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data);
128 static FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes);
129 static FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
131 static FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[]);
132 static void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status);
133 static FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample);
135 static FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample);
137 static FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
138 static FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data);
139 static FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data);
140 static FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data);
141 static FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data);
143 /***********************************************************************
147 ***********************************************************************/
149 typedef struct FLAC__StreamDecoderPrivate {
153 FLAC__StreamDecoderReadCallback read_callback;
154 FLAC__StreamDecoderSeekCallback seek_callback;
155 FLAC__StreamDecoderTellCallback tell_callback;
156 FLAC__StreamDecoderLengthCallback length_callback;
157 FLAC__StreamDecoderEofCallback eof_callback;
158 FLAC__StreamDecoderWriteCallback write_callback;
159 FLAC__StreamDecoderMetadataCallback metadata_callback;
160 FLAC__StreamDecoderErrorCallback error_callback;
161 /* generic 32-bit datapath: */
162 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[]);
163 /* generic 64-bit datapath: */
164 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[]);
165 /* for use when the signal is <= 16 bits-per-sample, or <= 15 bits-per-sample on a side channel (which requires 1 extra bit): */
166 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[]);
167 /* for use when the signal is <= 16 bits-per-sample, or <= 15 bits-per-sample on a side channel (which requires 1 extra bit), AND order <= 8: */
168 void (*local_lpc_restore_signal_16bit_order8)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
169 FLAC__bool (*local_bitreader_read_rice_signed_block)(FLAC__BitReader *br, int vals[], unsigned nvals, unsigned parameter);
171 FILE *file; /* only used if FLAC__stream_decoder_init_file()/FLAC__stream_decoder_init_file() called, else NULL */
172 FLAC__BitReader *input;
173 FLAC__int32 *output[FLAC__MAX_CHANNELS];
174 FLAC__int32 *residual[FLAC__MAX_CHANNELS]; /* WATCHOUT: these are the aligned pointers; the real pointers that should be free()'d are residual_unaligned[] below */
175 FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents[FLAC__MAX_CHANNELS];
176 unsigned output_capacity, output_channels;
177 FLAC__uint32 last_frame_number;
178 FLAC__uint32 last_block_size;
179 FLAC__uint64 samples_decoded;
180 FLAC__bool has_stream_info, has_seek_table;
181 FLAC__StreamMetadata stream_info;
182 FLAC__StreamMetadata seek_table;
183 FLAC__bool metadata_filter[128]; /* MAGIC number 128 == total number of metadata block types == 1 << 7 */
184 FLAC__byte *metadata_filter_ids;
185 unsigned metadata_filter_ids_count, metadata_filter_ids_capacity; /* units for both are IDs, not bytes */
187 FLAC__bool cached; /* true if there is a byte in lookahead */
188 FLAC__CPUInfo cpuinfo;
189 FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */
190 FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */
191 /* unaligned (original) pointers to allocated data */
192 FLAC__int32 *residual_unaligned[FLAC__MAX_CHANNELS];
193 FLAC__bool do_md5_checking; /* initially gets protected_->md5_checking but is turned off after a seek or if the metadata has a zero MD5 */
194 FLAC__bool internal_reset_hack; /* used only during init() so we can call reset to set up the decoder without rewinding the input */
195 FLAC__bool is_seeking;
196 FLAC__MD5Context md5context;
197 FLAC__byte computed_md5sum[16]; /* this is the sum we computed from the decoded data */
198 /* (the rest of these are only used for seeking) */
199 FLAC__Frame last_frame; /* holds the info of the last frame we seeked to */
200 FLAC__uint64 first_frame_offset; /* hint to the seek routine of where in the stream the first audio frame starts */
201 FLAC__uint64 target_sample;
202 unsigned unparseable_frame_count; /* used to tell whether we're decoding a future version of FLAC or just got a bad sync */
204 FLAC__bool got_a_frame; /* hack needed in Ogg FLAC seek routine to check when process_single() actually writes a frame */
206 } FLAC__StreamDecoderPrivate;
208 /***********************************************************************
210 * Public static class data
212 ***********************************************************************/
214 FLAC_API const char * const FLAC__StreamDecoderStateString[] = {
215 "FLAC__STREAM_DECODER_SEARCH_FOR_METADATA",
216 "FLAC__STREAM_DECODER_READ_METADATA",
217 "FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC",
218 "FLAC__STREAM_DECODER_READ_FRAME",
219 "FLAC__STREAM_DECODER_END_OF_STREAM",
220 "FLAC__STREAM_DECODER_OGG_ERROR",
221 "FLAC__STREAM_DECODER_SEEK_ERROR",
222 "FLAC__STREAM_DECODER_ABORTED",
223 "FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR",
224 "FLAC__STREAM_DECODER_UNINITIALIZED"
227 FLAC_API const char * const FLAC__StreamDecoderInitStatusString[] = {
228 "FLAC__STREAM_DECODER_INIT_STATUS_OK",
229 "FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER",
230 "FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS",
231 "FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR",
232 "FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE",
233 "FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED"
236 FLAC_API const char * const FLAC__StreamDecoderReadStatusString[] = {
237 "FLAC__STREAM_DECODER_READ_STATUS_CONTINUE",
238 "FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM",
239 "FLAC__STREAM_DECODER_READ_STATUS_ABORT"
242 FLAC_API const char * const FLAC__StreamDecoderSeekStatusString[] = {
243 "FLAC__STREAM_DECODER_SEEK_STATUS_OK",
244 "FLAC__STREAM_DECODER_SEEK_STATUS_ERROR",
245 "FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED"
248 FLAC_API const char * const FLAC__StreamDecoderTellStatusString[] = {
249 "FLAC__STREAM_DECODER_TELL_STATUS_OK",
250 "FLAC__STREAM_DECODER_TELL_STATUS_ERROR",
251 "FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED"
254 FLAC_API const char * const FLAC__StreamDecoderLengthStatusString[] = {
255 "FLAC__STREAM_DECODER_LENGTH_STATUS_OK",
256 "FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR",
257 "FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED"
260 FLAC_API const char * const FLAC__StreamDecoderWriteStatusString[] = {
261 "FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE",
262 "FLAC__STREAM_DECODER_WRITE_STATUS_ABORT"
265 FLAC_API const char * const FLAC__StreamDecoderErrorStatusString[] = {
266 "FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC",
267 "FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER",
268 "FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH",
269 "FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM"
272 /***********************************************************************
274 * Class constructor/destructor
276 ***********************************************************************/
277 FLAC_API FLAC__StreamDecoder *FLAC__stream_decoder_new(void)
279 FLAC__StreamDecoder *decoder;
282 FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
284 decoder = (FLAC__StreamDecoder*)calloc(1, sizeof(FLAC__StreamDecoder));
289 decoder->protected_ = (FLAC__StreamDecoderProtected*)calloc(1, sizeof(FLAC__StreamDecoderProtected));
290 if(decoder->protected_ == 0) {
295 decoder->private_ = (FLAC__StreamDecoderPrivate*)calloc(1, sizeof(FLAC__StreamDecoderPrivate));
296 if(decoder->private_ == 0) {
297 free(decoder->protected_);
302 decoder->private_->input = FLAC__bitreader_new();
303 if(decoder->private_->input == 0) {
304 free(decoder->private_);
305 free(decoder->protected_);
310 decoder->private_->metadata_filter_ids_capacity = 16;
311 if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)malloc((FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) * decoder->private_->metadata_filter_ids_capacity))) {
312 FLAC__bitreader_delete(decoder->private_->input);
313 free(decoder->private_);
314 free(decoder->protected_);
319 for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
320 decoder->private_->output[i] = 0;
321 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
324 decoder->private_->output_capacity = 0;
325 decoder->private_->output_channels = 0;
326 decoder->private_->has_seek_table = false;
328 for(i = 0; i < FLAC__MAX_CHANNELS; i++)
329 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&decoder->private_->partitioned_rice_contents[i]);
331 decoder->private_->file = 0;
333 set_defaults_(decoder);
335 decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
340 FLAC_API void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder)
344 FLAC__ASSERT(0 != decoder);
345 FLAC__ASSERT(0 != decoder->protected_);
346 FLAC__ASSERT(0 != decoder->private_);
347 FLAC__ASSERT(0 != decoder->private_->input);
349 (void)FLAC__stream_decoder_finish(decoder);
351 if(0 != decoder->private_->metadata_filter_ids)
352 free(decoder->private_->metadata_filter_ids);
354 FLAC__bitreader_delete(decoder->private_->input);
356 for(i = 0; i < FLAC__MAX_CHANNELS; i++)
357 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&decoder->private_->partitioned_rice_contents[i]);
359 free(decoder->private_);
360 free(decoder->protected_);
364 /***********************************************************************
366 * Public class methods
368 ***********************************************************************/
370 static FLAC__StreamDecoderInitStatus init_stream_internal_(
371 FLAC__StreamDecoder *decoder,
372 FLAC__StreamDecoderReadCallback read_callback,
373 FLAC__StreamDecoderSeekCallback seek_callback,
374 FLAC__StreamDecoderTellCallback tell_callback,
375 FLAC__StreamDecoderLengthCallback length_callback,
376 FLAC__StreamDecoderEofCallback eof_callback,
377 FLAC__StreamDecoderWriteCallback write_callback,
378 FLAC__StreamDecoderMetadataCallback metadata_callback,
379 FLAC__StreamDecoderErrorCallback error_callback,
384 FLAC__ASSERT(0 != decoder);
386 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
387 return FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
391 return FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER;
395 0 == read_callback ||
396 0 == write_callback ||
397 0 == error_callback ||
398 (seek_callback && (0 == tell_callback || 0 == length_callback || 0 == eof_callback))
400 return FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
403 decoder->private_->is_ogg = is_ogg;
404 if(is_ogg && !FLAC__ogg_decoder_aspect_init(&decoder->protected_->ogg_decoder_aspect))
405 return decoder->protected_->state = FLAC__STREAM_DECODER_OGG_ERROR;
409 * get the CPU info and set the function pointers
411 FLAC__cpu_info(&decoder->private_->cpuinfo);
412 /* first default to the non-asm routines */
413 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal;
414 decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide;
415 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal;
416 decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal;
417 decoder->private_->local_bitreader_read_rice_signed_block = FLAC__bitreader_read_rice_signed_block;
418 /* now override with asm where appropriate */
420 if(decoder->private_->cpuinfo.use_asm) {
421 #ifdef FLAC__CPU_IA32
422 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
423 #ifdef FLAC__HAS_NASM
424 if(decoder->private_->cpuinfo.data.ia32.bswap)
425 decoder->private_->local_bitreader_read_rice_signed_block = FLAC__bitreader_read_rice_signed_block_asm_ia32_bswap;
426 if(decoder->private_->cpuinfo.data.ia32.mmx) {
427 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
428 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32_mmx;
429 decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal_asm_ia32_mmx;
432 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
433 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32;
434 decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal_asm_ia32;
437 #elif defined FLAC__CPU_PPC
438 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_PPC);
439 if(decoder->private_->cpuinfo.data.ppc.altivec) {
440 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ppc_altivec_16;
441 decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal_asm_ppc_altivec_16_order8;
447 /* from here on, errors are fatal */
449 if(!FLAC__bitreader_init(decoder->private_->input, decoder->private_->cpuinfo, read_callback_, decoder)) {
450 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
451 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR;
454 decoder->private_->read_callback = read_callback;
455 decoder->private_->seek_callback = seek_callback;
456 decoder->private_->tell_callback = tell_callback;
457 decoder->private_->length_callback = length_callback;
458 decoder->private_->eof_callback = eof_callback;
459 decoder->private_->write_callback = write_callback;
460 decoder->private_->metadata_callback = metadata_callback;
461 decoder->private_->error_callback = error_callback;
462 decoder->private_->client_data = client_data;
463 decoder->private_->last_frame_number = 0;
464 decoder->private_->last_block_size = 0;
465 decoder->private_->samples_decoded = 0;
466 decoder->private_->has_stream_info = false;
467 decoder->private_->cached = false;
469 decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
470 decoder->private_->is_seeking = false;
472 decoder->private_->internal_reset_hack = true; /* so the following reset does not try to rewind the input */
473 if(!FLAC__stream_decoder_reset(decoder)) {
474 /* above call sets the state for us */
475 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR;
478 return FLAC__STREAM_DECODER_INIT_STATUS_OK;
481 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_stream(
482 FLAC__StreamDecoder *decoder,
483 FLAC__StreamDecoderReadCallback read_callback,
484 FLAC__StreamDecoderSeekCallback seek_callback,
485 FLAC__StreamDecoderTellCallback tell_callback,
486 FLAC__StreamDecoderLengthCallback length_callback,
487 FLAC__StreamDecoderEofCallback eof_callback,
488 FLAC__StreamDecoderWriteCallback write_callback,
489 FLAC__StreamDecoderMetadataCallback metadata_callback,
490 FLAC__StreamDecoderErrorCallback error_callback,
494 return init_stream_internal_(
509 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_stream(
510 FLAC__StreamDecoder *decoder,
511 FLAC__StreamDecoderReadCallback read_callback,
512 FLAC__StreamDecoderSeekCallback seek_callback,
513 FLAC__StreamDecoderTellCallback tell_callback,
514 FLAC__StreamDecoderLengthCallback length_callback,
515 FLAC__StreamDecoderEofCallback eof_callback,
516 FLAC__StreamDecoderWriteCallback write_callback,
517 FLAC__StreamDecoderMetadataCallback metadata_callback,
518 FLAC__StreamDecoderErrorCallback error_callback,
522 return init_stream_internal_(
537 static FLAC__StreamDecoderInitStatus init_FILE_internal_(
538 FLAC__StreamDecoder *decoder,
540 FLAC__StreamDecoderWriteCallback write_callback,
541 FLAC__StreamDecoderMetadataCallback metadata_callback,
542 FLAC__StreamDecoderErrorCallback error_callback,
547 FLAC__ASSERT(0 != decoder);
548 FLAC__ASSERT(0 != file);
550 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
551 return decoder->protected_->state = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
553 if(0 == write_callback || 0 == error_callback)
554 return decoder->protected_->state = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
557 * To make sure that our file does not go unclosed after an error, we
558 * must assign the FILE pointer before any further error can occur in
562 file = get_binary_stdin_(); /* just to be safe */
564 decoder->private_->file = file;
566 return init_stream_internal_(
569 decoder->private_->file == stdin? 0: file_seek_callback_,
570 decoder->private_->file == stdin? 0: file_tell_callback_,
571 decoder->private_->file == stdin? 0: file_length_callback_,
581 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_FILE(
582 FLAC__StreamDecoder *decoder,
584 FLAC__StreamDecoderWriteCallback write_callback,
585 FLAC__StreamDecoderMetadataCallback metadata_callback,
586 FLAC__StreamDecoderErrorCallback error_callback,
590 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false);
593 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_FILE(
594 FLAC__StreamDecoder *decoder,
596 FLAC__StreamDecoderWriteCallback write_callback,
597 FLAC__StreamDecoderMetadataCallback metadata_callback,
598 FLAC__StreamDecoderErrorCallback error_callback,
602 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true);
605 static FLAC__StreamDecoderInitStatus init_file_internal_(
606 FLAC__StreamDecoder *decoder,
607 const char *filename,
608 FLAC__StreamDecoderWriteCallback write_callback,
609 FLAC__StreamDecoderMetadataCallback metadata_callback,
610 FLAC__StreamDecoderErrorCallback error_callback,
617 FLAC__ASSERT(0 != decoder);
620 * To make sure that our file does not go unclosed after an error, we
621 * have to do the same entrance checks here that are later performed
622 * in FLAC__stream_decoder_init_FILE() before the FILE* is assigned.
624 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
625 return decoder->protected_->state = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
627 if(0 == write_callback || 0 == error_callback)
628 return decoder->protected_->state = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
630 file = filename? fopen(filename, "rb") : stdin;
633 return FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE;
635 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, is_ogg);
638 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_file(
639 FLAC__StreamDecoder *decoder,
640 const char *filename,
641 FLAC__StreamDecoderWriteCallback write_callback,
642 FLAC__StreamDecoderMetadataCallback metadata_callback,
643 FLAC__StreamDecoderErrorCallback error_callback,
647 return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false);
650 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_file(
651 FLAC__StreamDecoder *decoder,
652 const char *filename,
653 FLAC__StreamDecoderWriteCallback write_callback,
654 FLAC__StreamDecoderMetadataCallback metadata_callback,
655 FLAC__StreamDecoderErrorCallback error_callback,
659 return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true);
662 FLAC_API FLAC__bool FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder)
664 FLAC__bool md5_failed = false;
667 FLAC__ASSERT(0 != decoder);
668 FLAC__ASSERT(0 != decoder->private_);
669 FLAC__ASSERT(0 != decoder->protected_);
671 if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
674 /* see the comment in FLAC__seekable_stream_decoder_reset() as to why we
675 * always call FLAC__MD5Final()
677 FLAC__MD5Final(decoder->private_->computed_md5sum, &decoder->private_->md5context);
679 if(decoder->private_->has_seek_table && 0 != decoder->private_->seek_table.data.seek_table.points) {
680 free(decoder->private_->seek_table.data.seek_table.points);
681 decoder->private_->seek_table.data.seek_table.points = 0;
682 decoder->private_->has_seek_table = false;
684 FLAC__bitreader_free(decoder->private_->input);
685 for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
687 * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the
688 * output arrays have a buffer of up to 3 zeroes in front
689 * (at negative indices) for alignment purposes; we use 4
690 * to keep the data well-aligned.
692 if(0 != decoder->private_->output[i]) {
693 free(decoder->private_->output[i]-4);
694 decoder->private_->output[i] = 0;
696 if(0 != decoder->private_->residual_unaligned[i]) {
697 free(decoder->private_->residual_unaligned[i]);
698 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
701 decoder->private_->output_capacity = 0;
702 decoder->private_->output_channels = 0;
705 if(decoder->private_->is_ogg)
706 FLAC__ogg_decoder_aspect_finish(&decoder->protected_->ogg_decoder_aspect);
709 if(0 != decoder->private_->file) {
710 if(decoder->private_->file != stdin)
711 fclose(decoder->private_->file);
712 decoder->private_->file = 0;
715 if(decoder->private_->do_md5_checking) {
716 if(memcmp(decoder->private_->stream_info.data.stream_info.md5sum, decoder->private_->computed_md5sum, 16))
719 decoder->private_->is_seeking = false;
721 set_defaults_(decoder);
723 decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
728 FLAC_API FLAC__bool FLAC__stream_decoder_set_ogg_serial_number(FLAC__StreamDecoder *decoder, long value)
730 FLAC__ASSERT(0 != decoder);
731 FLAC__ASSERT(0 != decoder->private_);
732 FLAC__ASSERT(0 != decoder->protected_);
733 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
736 /* can't check decoder->private_->is_ogg since that's not set until init time */
737 FLAC__ogg_decoder_aspect_set_serial_number(&decoder->protected_->ogg_decoder_aspect, value);
745 FLAC_API FLAC__bool FLAC__stream_decoder_set_md5_checking(FLAC__StreamDecoder *decoder, FLAC__bool value)
747 FLAC__ASSERT(0 != decoder);
748 FLAC__ASSERT(0 != decoder->protected_);
749 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
751 decoder->protected_->md5_checking = value;
755 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
757 FLAC__ASSERT(0 != decoder);
758 FLAC__ASSERT(0 != decoder->private_);
759 FLAC__ASSERT(0 != decoder->protected_);
760 FLAC__ASSERT((unsigned)type <= FLAC__MAX_METADATA_TYPE_CODE);
761 /* double protection */
762 if((unsigned)type > FLAC__MAX_METADATA_TYPE_CODE)
764 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
766 decoder->private_->metadata_filter[type] = true;
767 if(type == FLAC__METADATA_TYPE_APPLICATION)
768 decoder->private_->metadata_filter_ids_count = 0;
772 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
774 FLAC__ASSERT(0 != decoder);
775 FLAC__ASSERT(0 != decoder->private_);
776 FLAC__ASSERT(0 != decoder->protected_);
777 FLAC__ASSERT(0 != id);
778 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
781 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
784 FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
786 if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
787 if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2))) {
788 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
791 decoder->private_->metadata_filter_ids_capacity *= 2;
794 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));
795 decoder->private_->metadata_filter_ids_count++;
800 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder)
803 FLAC__ASSERT(0 != decoder);
804 FLAC__ASSERT(0 != decoder->private_);
805 FLAC__ASSERT(0 != decoder->protected_);
806 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
808 for(i = 0; i < sizeof(decoder->private_->metadata_filter) / sizeof(decoder->private_->metadata_filter[0]); i++)
809 decoder->private_->metadata_filter[i] = true;
810 decoder->private_->metadata_filter_ids_count = 0;
814 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
816 FLAC__ASSERT(0 != decoder);
817 FLAC__ASSERT(0 != decoder->private_);
818 FLAC__ASSERT(0 != decoder->protected_);
819 FLAC__ASSERT((unsigned)type <= FLAC__MAX_METADATA_TYPE_CODE);
820 /* double protection */
821 if((unsigned)type > FLAC__MAX_METADATA_TYPE_CODE)
823 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
825 decoder->private_->metadata_filter[type] = false;
826 if(type == FLAC__METADATA_TYPE_APPLICATION)
827 decoder->private_->metadata_filter_ids_count = 0;
831 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
833 FLAC__ASSERT(0 != decoder);
834 FLAC__ASSERT(0 != decoder->private_);
835 FLAC__ASSERT(0 != decoder->protected_);
836 FLAC__ASSERT(0 != id);
837 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
840 if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
843 FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
845 if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
846 if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2))) {
847 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
850 decoder->private_->metadata_filter_ids_capacity *= 2;
853 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));
854 decoder->private_->metadata_filter_ids_count++;
859 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder)
861 FLAC__ASSERT(0 != decoder);
862 FLAC__ASSERT(0 != decoder->private_);
863 FLAC__ASSERT(0 != decoder->protected_);
864 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
866 memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
867 decoder->private_->metadata_filter_ids_count = 0;
871 FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder)
873 FLAC__ASSERT(0 != decoder);
874 FLAC__ASSERT(0 != decoder->protected_);
875 return decoder->protected_->state;
878 FLAC_API const char *FLAC__stream_decoder_get_resolved_state_string(const FLAC__StreamDecoder *decoder)
880 return FLAC__StreamDecoderStateString[decoder->protected_->state];
883 FLAC_API FLAC__bool FLAC__stream_decoder_get_md5_checking(const FLAC__StreamDecoder *decoder)
885 FLAC__ASSERT(0 != decoder);
886 FLAC__ASSERT(0 != decoder->protected_);
887 return decoder->protected_->md5_checking;
890 FLAC_API FLAC__uint64 FLAC__stream_decoder_get_total_samples(const FLAC__StreamDecoder *decoder)
892 FLAC__ASSERT(0 != decoder);
893 FLAC__ASSERT(0 != decoder->protected_);
894 return decoder->private_->has_stream_info? decoder->private_->stream_info.data.stream_info.total_samples : 0;
897 FLAC_API unsigned FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder)
899 FLAC__ASSERT(0 != decoder);
900 FLAC__ASSERT(0 != decoder->protected_);
901 return decoder->protected_->channels;
904 FLAC_API FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder)
906 FLAC__ASSERT(0 != decoder);
907 FLAC__ASSERT(0 != decoder->protected_);
908 return decoder->protected_->channel_assignment;
911 FLAC_API unsigned FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder)
913 FLAC__ASSERT(0 != decoder);
914 FLAC__ASSERT(0 != decoder->protected_);
915 return decoder->protected_->bits_per_sample;
918 FLAC_API unsigned FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder)
920 FLAC__ASSERT(0 != decoder);
921 FLAC__ASSERT(0 != decoder->protected_);
922 return decoder->protected_->sample_rate;
925 FLAC_API unsigned FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder)
927 FLAC__ASSERT(0 != decoder);
928 FLAC__ASSERT(0 != decoder->protected_);
929 return decoder->protected_->blocksize;
932 FLAC_API FLAC__bool FLAC__stream_decoder_get_decode_position(const FLAC__StreamDecoder *decoder, FLAC__uint64 *position)
934 FLAC__ASSERT(0 != decoder);
935 FLAC__ASSERT(0 != decoder->private_);
936 FLAC__ASSERT(0 != position);
939 if(decoder->private_->is_ogg)
942 if(0 == decoder->private_->tell_callback)
944 if(decoder->private_->tell_callback(decoder, position, decoder->private_->client_data) != FLAC__STREAM_DECODER_TELL_STATUS_OK)
946 /* should never happen since all FLAC frames and metadata blocks are byte aligned, but check just in case */
947 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input))
949 FLAC__ASSERT(*position >= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder));
950 *position -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder);
954 FLAC_API FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder)
956 FLAC__ASSERT(0 != decoder);
957 FLAC__ASSERT(0 != decoder->private_);
958 FLAC__ASSERT(0 != decoder->protected_);
960 decoder->private_->samples_decoded = 0;
961 decoder->private_->do_md5_checking = false;
964 if(decoder->private_->is_ogg)
965 FLAC__ogg_decoder_aspect_flush(&decoder->protected_->ogg_decoder_aspect);
968 if(!FLAC__bitreader_clear(decoder->private_->input)) {
969 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
972 decoder->private_->last_frame_number = 0;
973 decoder->private_->last_block_size = 0;
974 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
979 FLAC_API FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder)
981 FLAC__ASSERT(0 != decoder);
982 FLAC__ASSERT(0 != decoder->private_);
983 FLAC__ASSERT(0 != decoder->protected_);
985 if(!FLAC__stream_decoder_flush(decoder)) {
986 /* above call sets the state for us */
991 /*@@@ could go in !internal_reset_hack block below */
992 if(decoder->private_->is_ogg)
993 FLAC__ogg_decoder_aspect_reset(&decoder->protected_->ogg_decoder_aspect);
996 /* Rewind if necessary. If FLAC__stream_decoder_init() is calling us,
997 * (internal_reset_hack) don't try to rewind since we are already at
998 * the beginning of the stream and don't want to fail if the input is
1001 if(!decoder->private_->internal_reset_hack) {
1002 if(decoder->private_->file == stdin)
1003 return false; /* can't rewind stdin, reset fails */
1004 if(decoder->private_->seek_callback && decoder->private_->seek_callback(decoder, 0, decoder->private_->client_data) == FLAC__STREAM_DECODER_SEEK_STATUS_ERROR)
1005 return false; /* seekable and seek fails, reset fails */
1008 decoder->private_->internal_reset_hack = false;
1010 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
1012 decoder->private_->has_stream_info = false;
1013 if(decoder->private_->has_seek_table && 0 != decoder->private_->seek_table.data.seek_table.points) {
1014 free(decoder->private_->seek_table.data.seek_table.points);
1015 decoder->private_->seek_table.data.seek_table.points = 0;
1016 decoder->private_->has_seek_table = false;
1018 decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
1020 /* We initialize the FLAC__MD5Context even though we may never use it. This
1021 * is because md5 checking may be turned on to start and then turned off if
1022 * a seek occurs. So we init the context here and finalize it in
1023 * FLAC__stream_decoder_finish() to make sure things are always cleaned up
1026 FLAC__MD5Init(&decoder->private_->md5context);
1028 decoder->private_->first_frame_offset = 0;
1029 decoder->private_->unparseable_frame_count = 0;
1034 FLAC_API FLAC__bool FLAC__stream_decoder_process_single(FLAC__StreamDecoder *decoder)
1036 FLAC__bool got_a_frame;
1037 FLAC__ASSERT(0 != decoder);
1038 FLAC__ASSERT(0 != decoder->protected_);
1041 switch(decoder->protected_->state) {
1042 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1043 if(!find_metadata_(decoder))
1044 return false; /* above function sets the status for us */
1046 case FLAC__STREAM_DECODER_READ_METADATA:
1047 if(!read_metadata_(decoder))
1048 return false; /* above function sets the status for us */
1051 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1052 if(!frame_sync_(decoder))
1053 return true; /* above function sets the status for us */
1055 case FLAC__STREAM_DECODER_READ_FRAME:
1056 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/true))
1057 return false; /* above function sets the status for us */
1059 return true; /* above function sets the status for us */
1061 case FLAC__STREAM_DECODER_END_OF_STREAM:
1062 case FLAC__STREAM_DECODER_ABORTED:
1071 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder *decoder)
1073 FLAC__ASSERT(0 != decoder);
1074 FLAC__ASSERT(0 != decoder->protected_);
1077 switch(decoder->protected_->state) {
1078 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1079 if(!find_metadata_(decoder))
1080 return false; /* above function sets the status for us */
1082 case FLAC__STREAM_DECODER_READ_METADATA:
1083 if(!read_metadata_(decoder))
1084 return false; /* above function sets the status for us */
1086 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1087 case FLAC__STREAM_DECODER_READ_FRAME:
1088 case FLAC__STREAM_DECODER_END_OF_STREAM:
1089 case FLAC__STREAM_DECODER_ABORTED:
1098 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder *decoder)
1101 FLAC__ASSERT(0 != decoder);
1102 FLAC__ASSERT(0 != decoder->protected_);
1105 switch(decoder->protected_->state) {
1106 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1107 if(!find_metadata_(decoder))
1108 return false; /* above function sets the status for us */
1110 case FLAC__STREAM_DECODER_READ_METADATA:
1111 if(!read_metadata_(decoder))
1112 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 */
1118 case FLAC__STREAM_DECODER_READ_FRAME:
1119 if(!read_frame_(decoder, &dummy, /*do_full_decode=*/true))
1120 return false; /* above function sets the status for us */
1122 case FLAC__STREAM_DECODER_END_OF_STREAM:
1123 case FLAC__STREAM_DECODER_ABORTED:
1132 FLAC_API FLAC__bool FLAC__stream_decoder_skip_single_frame(FLAC__StreamDecoder *decoder)
1134 FLAC__bool got_a_frame;
1135 FLAC__ASSERT(0 != decoder);
1136 FLAC__ASSERT(0 != decoder->protected_);
1139 switch(decoder->protected_->state) {
1140 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1141 case FLAC__STREAM_DECODER_READ_METADATA:
1142 return false; /* above function sets the status for us */
1143 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1144 if(!frame_sync_(decoder))
1145 return true; /* above function sets the status for us */
1147 case FLAC__STREAM_DECODER_READ_FRAME:
1148 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/false))
1149 return false; /* above function sets the status for us */
1151 return true; /* above function sets the status for us */
1153 case FLAC__STREAM_DECODER_END_OF_STREAM:
1154 case FLAC__STREAM_DECODER_ABORTED:
1163 FLAC_API FLAC__bool FLAC__stream_decoder_seek_absolute(FLAC__StreamDecoder *decoder, FLAC__uint64 sample)
1165 FLAC__uint64 length;
1167 FLAC__ASSERT(0 != decoder);
1170 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA &&
1171 decoder->protected_->state != FLAC__STREAM_DECODER_READ_METADATA &&
1172 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC &&
1173 decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME &&
1174 decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM
1178 if(0 == decoder->private_->seek_callback)
1181 FLAC__ASSERT(decoder->private_->seek_callback);
1182 FLAC__ASSERT(decoder->private_->tell_callback);
1183 FLAC__ASSERT(decoder->private_->length_callback);
1184 FLAC__ASSERT(decoder->private_->eof_callback);
1186 if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder))
1189 decoder->private_->is_seeking = true;
1191 /* turn off md5 checking if a seek is attempted */
1192 decoder->private_->do_md5_checking = false;
1194 /* 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) */
1195 if(decoder->private_->length_callback(decoder, &length, decoder->private_->client_data) != FLAC__STREAM_DECODER_LENGTH_STATUS_OK) {
1196 decoder->private_->is_seeking = false;
1200 /* if we haven't finished processing the metadata yet, do that so we have the STREAMINFO, SEEK_TABLE, and first_frame_offset */
1202 decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA ||
1203 decoder->protected_->state == FLAC__STREAM_DECODER_READ_METADATA
1205 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder)) {
1206 /* above call sets the state for us */
1207 decoder->private_->is_seeking = false;
1210 /* check this again in case we didn't know total_samples the first time */
1211 if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder)) {
1212 decoder->private_->is_seeking = false;
1218 const FLAC__bool ok =
1220 decoder->private_->is_ogg?
1221 seek_to_absolute_sample_ogg_(decoder, length, sample) :
1223 seek_to_absolute_sample_(decoder, length, sample)
1225 decoder->private_->is_seeking = false;
1230 /***********************************************************************
1232 * Protected class methods
1234 ***********************************************************************/
1236 unsigned FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder)
1238 FLAC__ASSERT(0 != decoder);
1239 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1240 FLAC__ASSERT(!(FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) & 7));
1241 return FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) / 8;
1244 /***********************************************************************
1246 * Private class methods
1248 ***********************************************************************/
1250 void set_defaults_(FLAC__StreamDecoder *decoder)
1253 decoder->private_->is_ogg = false;
1255 decoder->private_->read_callback = 0;
1256 decoder->private_->seek_callback = 0;
1257 decoder->private_->tell_callback = 0;
1258 decoder->private_->length_callback = 0;
1259 decoder->private_->eof_callback = 0;
1260 decoder->private_->write_callback = 0;
1261 decoder->private_->metadata_callback = 0;
1262 decoder->private_->error_callback = 0;
1263 decoder->private_->client_data = 0;
1265 memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
1266 decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] = true;
1267 decoder->private_->metadata_filter_ids_count = 0;
1269 decoder->protected_->md5_checking = false;
1272 FLAC__ogg_decoder_aspect_set_defaults(&decoder->protected_->ogg_decoder_aspect);
1277 * This will forcibly set stdin to binary mode (for OSes that require it)
1279 FILE *get_binary_stdin_(void)
1281 /* if something breaks here it is probably due to the presence or
1282 * absence of an underscore before the identifiers 'setmode',
1283 * 'fileno', and/or 'O_BINARY'; check your system header files.
1285 #if defined _MSC_VER || defined __MINGW32__
1286 _setmode(_fileno(stdin), _O_BINARY);
1287 #elif defined __CYGWIN__ || defined __EMX__
1288 /* almost certainly not needed for any modern Cygwin, but let's be safe... */
1289 setmode(_fileno(stdin), _O_BINARY);
1295 FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels)
1300 if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels)
1303 /* simply using realloc() is not practical because the number of channels may change mid-stream */
1305 for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
1306 if(0 != decoder->private_->output[i]) {
1307 free(decoder->private_->output[i]-4);
1308 decoder->private_->output[i] = 0;
1310 if(0 != decoder->private_->residual_unaligned[i]) {
1311 free(decoder->private_->residual_unaligned[i]);
1312 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
1316 for(i = 0; i < channels; i++) {
1318 * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the
1319 * output arrays have a buffer of up to 3 zeroes in front
1320 * (at negative indices) for alignment purposes; we use 4
1321 * to keep the data well-aligned.
1323 tmp = (FLAC__int32*)malloc(sizeof(FLAC__int32)*(size+4));
1325 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1328 memset(tmp, 0, sizeof(FLAC__int32)*4);
1329 decoder->private_->output[i] = tmp + 4;
1332 * minimum of quadword alignment for PPC vector optimizations is REQUIRED:
1334 if(!FLAC__memory_alloc_aligned_int32_array(size, &decoder->private_->residual_unaligned[i], &decoder->private_->residual[i])) {
1335 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1340 decoder->private_->output_capacity = size;
1341 decoder->private_->output_channels = channels;
1346 FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id)
1350 FLAC__ASSERT(0 != decoder);
1351 FLAC__ASSERT(0 != decoder->private_);
1353 for(i = 0; i < decoder->private_->metadata_filter_ids_count; i++)
1354 if(0 == memcmp(decoder->private_->metadata_filter_ids + i * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)))
1360 FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder)
1364 FLAC__bool first = true;
1366 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1368 for(i = id = 0; i < 4; ) {
1369 if(decoder->private_->cached) {
1370 x = (FLAC__uint32)decoder->private_->lookahead;
1371 decoder->private_->cached = false;
1374 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1375 return false; /* read_callback_ sets the state for us */
1377 if(x == FLAC__STREAM_SYNC_STRING[i]) {
1383 if(x == ID3V2_TAG_[id]) {
1387 if(!skip_id3v2_tag_(decoder))
1388 return false; /* skip_id3v2_tag_ sets the state for us */
1393 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1394 decoder->private_->header_warmup[0] = (FLAC__byte)x;
1395 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1396 return false; /* read_callback_ sets the state for us */
1398 /* 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 */
1399 /* else we have to check if the second byte is the end of a sync code */
1400 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1401 decoder->private_->lookahead = (FLAC__byte)x;
1402 decoder->private_->cached = true;
1404 else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
1405 decoder->private_->header_warmup[1] = (FLAC__byte)x;
1406 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
1412 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
1417 decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA;
1421 FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder)
1424 FLAC__uint32 i, x, type, length;
1426 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1428 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_IS_LAST_LEN))
1429 return false; /* read_callback_ sets the state for us */
1430 is_last = x? true : false;
1432 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN))
1433 return false; /* read_callback_ sets the state for us */
1435 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN))
1436 return false; /* read_callback_ sets the state for us */
1438 if(type == FLAC__METADATA_TYPE_STREAMINFO) {
1439 if(!read_metadata_streaminfo_(decoder, is_last, length))
1442 decoder->private_->has_stream_info = true;
1443 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))
1444 decoder->private_->do_md5_checking = false;
1445 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] && decoder->private_->metadata_callback)
1446 decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data);
1448 else if(type == FLAC__METADATA_TYPE_SEEKTABLE) {
1449 if(!read_metadata_seektable_(decoder, is_last, length))
1452 decoder->private_->has_seek_table = true;
1453 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_SEEKTABLE] && decoder->private_->metadata_callback)
1454 decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data);
1457 FLAC__bool skip_it = !decoder->private_->metadata_filter[type];
1458 unsigned real_length = length;
1459 FLAC__StreamMetadata block;
1461 block.is_last = is_last;
1462 block.type = (FLAC__MetadataType)type;
1463 block.length = length;
1465 if(type == FLAC__METADATA_TYPE_APPLICATION) {
1466 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8))
1467 return false; /* read_callback_ sets the state for us */
1469 real_length -= FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8;
1471 if(decoder->private_->metadata_filter_ids_count > 0 && has_id_filtered_(decoder, block.data.application.id))
1476 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length))
1477 return false; /* read_callback_ sets the state for us */
1481 case FLAC__METADATA_TYPE_PADDING:
1482 /* skip the padding bytes */
1483 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length))
1484 return false; /* read_callback_ sets the state for us */
1486 case FLAC__METADATA_TYPE_APPLICATION:
1487 /* remember, we read the ID already */
1488 if(real_length > 0) {
1489 if(0 == (block.data.application.data = (FLAC__byte*)malloc(real_length))) {
1490 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1493 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.data, real_length))
1494 return false; /* read_callback_ sets the state for us */
1497 block.data.application.data = 0;
1499 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1500 if(!read_metadata_vorbiscomment_(decoder, &block.data.vorbis_comment))
1503 case FLAC__METADATA_TYPE_CUESHEET:
1504 if(!read_metadata_cuesheet_(decoder, &block.data.cue_sheet))
1507 case FLAC__METADATA_TYPE_PICTURE:
1508 if(!read_metadata_picture_(decoder, &block.data.picture))
1511 case FLAC__METADATA_TYPE_STREAMINFO:
1512 case FLAC__METADATA_TYPE_SEEKTABLE:
1516 if(real_length > 0) {
1517 if(0 == (block.data.unknown.data = (FLAC__byte*)malloc(real_length))) {
1518 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1521 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.unknown.data, real_length))
1522 return false; /* read_callback_ sets the state for us */
1525 block.data.unknown.data = 0;
1528 if(!decoder->private_->is_seeking && decoder->private_->metadata_callback)
1529 decoder->private_->metadata_callback(decoder, &block, decoder->private_->client_data);
1531 /* now we have to free any malloc'ed data in the block */
1533 case FLAC__METADATA_TYPE_PADDING:
1535 case FLAC__METADATA_TYPE_APPLICATION:
1536 if(0 != block.data.application.data)
1537 free(block.data.application.data);
1539 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1540 if(0 != block.data.vorbis_comment.vendor_string.entry)
1541 free(block.data.vorbis_comment.vendor_string.entry);
1542 if(block.data.vorbis_comment.num_comments > 0)
1543 for(i = 0; i < block.data.vorbis_comment.num_comments; i++)
1544 if(0 != block.data.vorbis_comment.comments[i].entry)
1545 free(block.data.vorbis_comment.comments[i].entry);
1546 if(0 != block.data.vorbis_comment.comments)
1547 free(block.data.vorbis_comment.comments);
1549 case FLAC__METADATA_TYPE_CUESHEET:
1550 if(block.data.cue_sheet.num_tracks > 0)
1551 for(i = 0; i < block.data.cue_sheet.num_tracks; i++)
1552 if(0 != block.data.cue_sheet.tracks[i].indices)
1553 free(block.data.cue_sheet.tracks[i].indices);
1554 if(0 != block.data.cue_sheet.tracks)
1555 free(block.data.cue_sheet.tracks);
1557 case FLAC__METADATA_TYPE_PICTURE:
1558 if(0 != block.data.picture.mime_type)
1559 free(block.data.picture.mime_type);
1560 if(0 != block.data.picture.description)
1561 free(block.data.picture.description);
1562 if(0 != block.data.picture.data)
1563 free(block.data.picture.data);
1565 case FLAC__METADATA_TYPE_STREAMINFO:
1566 case FLAC__METADATA_TYPE_SEEKTABLE:
1569 if(0 != block.data.unknown.data)
1570 free(block.data.unknown.data);
1577 /* if this fails, it's OK, it's just a hint for the seek routine */
1578 if(!FLAC__stream_decoder_get_decode_position(decoder, &decoder->private_->first_frame_offset))
1579 decoder->private_->first_frame_offset = 0;
1580 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1586 FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length)
1589 unsigned bits, used_bits = 0;
1591 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1593 decoder->private_->stream_info.type = FLAC__METADATA_TYPE_STREAMINFO;
1594 decoder->private_->stream_info.is_last = is_last;
1595 decoder->private_->stream_info.length = length;
1597 bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN;
1598 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, bits))
1599 return false; /* read_callback_ sets the state for us */
1600 decoder->private_->stream_info.data.stream_info.min_blocksize = x;
1603 bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN;
1604 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN))
1605 return false; /* read_callback_ sets the state for us */
1606 decoder->private_->stream_info.data.stream_info.max_blocksize = x;
1609 bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN;
1610 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN))
1611 return false; /* read_callback_ sets the state for us */
1612 decoder->private_->stream_info.data.stream_info.min_framesize = x;
1615 bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN;
1616 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN))
1617 return false; /* read_callback_ sets the state for us */
1618 decoder->private_->stream_info.data.stream_info.max_framesize = x;
1621 bits = FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN;
1622 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN))
1623 return false; /* read_callback_ sets the state for us */
1624 decoder->private_->stream_info.data.stream_info.sample_rate = x;
1627 bits = FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN;
1628 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN))
1629 return false; /* read_callback_ sets the state for us */
1630 decoder->private_->stream_info.data.stream_info.channels = x+1;
1633 bits = FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN;
1634 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN))
1635 return false; /* read_callback_ sets the state for us */
1636 decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1;
1639 bits = FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN;
1640 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))
1641 return false; /* read_callback_ sets the state for us */
1644 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, decoder->private_->stream_info.data.stream_info.md5sum, 16))
1645 return false; /* read_callback_ sets the state for us */
1648 /* skip the rest of the block */
1649 FLAC__ASSERT(used_bits % 8 == 0);
1650 length -= (used_bits / 8);
1651 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
1652 return false; /* read_callback_ sets the state for us */
1657 FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length)
1662 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1664 decoder->private_->seek_table.type = FLAC__METADATA_TYPE_SEEKTABLE;
1665 decoder->private_->seek_table.is_last = is_last;
1666 decoder->private_->seek_table.length = length;
1668 decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
1670 /* use realloc since we may pass through here several times (e.g. after seeking) */
1671 if(0 == (decoder->private_->seek_table.data.seek_table.points = (FLAC__StreamMetadata_SeekPoint*)realloc(decoder->private_->seek_table.data.seek_table.points, decoder->private_->seek_table.data.seek_table.num_points * sizeof(FLAC__StreamMetadata_SeekPoint)))) {
1672 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1675 for(i = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) {
1676 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN))
1677 return false; /* read_callback_ sets the state for us */
1678 decoder->private_->seek_table.data.seek_table.points[i].sample_number = xx;
1680 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN))
1681 return false; /* read_callback_ sets the state for us */
1682 decoder->private_->seek_table.data.seek_table.points[i].stream_offset = xx;
1684 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN))
1685 return false; /* read_callback_ sets the state for us */
1686 decoder->private_->seek_table.data.seek_table.points[i].frame_samples = x;
1688 length -= (decoder->private_->seek_table.data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH);
1689 /* if there is a partial point left, skip over it */
1691 /*@@@ do a send_error_to_client_() here? there's an argument for either way */
1692 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
1693 return false; /* read_callback_ sets the state for us */
1699 FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj)
1703 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1705 /* read vendor string */
1706 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1707 if(!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->vendor_string.length))
1708 return false; /* read_callback_ sets the state for us */
1709 if(obj->vendor_string.length > 0) {
1710 if(0 == (obj->vendor_string.entry = (FLAC__byte*)malloc(obj->vendor_string.length+1))) {
1711 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1714 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->vendor_string.entry, obj->vendor_string.length))
1715 return false; /* read_callback_ sets the state for us */
1716 obj->vendor_string.entry[obj->vendor_string.length] = '\0';
1719 obj->vendor_string.entry = 0;
1721 /* read num comments */
1722 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN == 32);
1723 if(!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->num_comments))
1724 return false; /* read_callback_ sets the state for us */
1727 if(obj->num_comments > 0) {
1728 if(0 == (obj->comments = (FLAC__StreamMetadata_VorbisComment_Entry*)malloc(obj->num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) {
1729 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1732 for(i = 0; i < obj->num_comments; i++) {
1733 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1734 if(!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->comments[i].length))
1735 return false; /* read_callback_ sets the state for us */
1736 if(obj->comments[i].length > 0) {
1737 if(0 == (obj->comments[i].entry = (FLAC__byte*)malloc(obj->comments[i].length+1))) {
1738 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1741 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->comments[i].entry, obj->comments[i].length))
1742 return false; /* read_callback_ sets the state for us */
1743 obj->comments[i].entry[obj->comments[i].length] = '\0';
1746 obj->comments[i].entry = 0;
1756 FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj)
1758 FLAC__uint32 i, j, x;
1760 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1762 memset(obj, 0, sizeof(FLAC__StreamMetadata_CueSheet));
1764 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
1765 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))
1766 return false; /* read_callback_ sets the state for us */
1768 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &obj->lead_in, FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN))
1769 return false; /* read_callback_ sets the state for us */
1771 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN))
1772 return false; /* read_callback_ sets the state for us */
1773 obj->is_cd = x? true : false;
1775 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN))
1776 return false; /* read_callback_ sets the state for us */
1778 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN))
1779 return false; /* read_callback_ sets the state for us */
1780 obj->num_tracks = x;
1782 if(obj->num_tracks > 0) {
1783 if(0 == (obj->tracks = (FLAC__StreamMetadata_CueSheet_Track*)calloc(obj->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track)))) {
1784 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1787 for(i = 0; i < obj->num_tracks; i++) {
1788 FLAC__StreamMetadata_CueSheet_Track *track = &obj->tracks[i];
1789 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &track->offset, FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN))
1790 return false; /* read_callback_ sets the state for us */
1792 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN))
1793 return false; /* read_callback_ sets the state for us */
1794 track->number = (FLAC__byte)x;
1796 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
1797 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)track->isrc, FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN/8))
1798 return false; /* read_callback_ sets the state for us */
1800 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN))
1801 return false; /* read_callback_ sets the state for us */
1804 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN))
1805 return false; /* read_callback_ sets the state for us */
1806 track->pre_emphasis = x;
1808 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN))
1809 return false; /* read_callback_ sets the state for us */
1811 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN))
1812 return false; /* read_callback_ sets the state for us */
1813 track->num_indices = (FLAC__byte)x;
1815 if(track->num_indices > 0) {
1816 if(0 == (track->indices = (FLAC__StreamMetadata_CueSheet_Index*)calloc(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index)))) {
1817 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1820 for(j = 0; j < track->num_indices; j++) {
1821 FLAC__StreamMetadata_CueSheet_Index *index = &track->indices[j];
1822 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &index->offset, FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN))
1823 return false; /* read_callback_ sets the state for us */
1825 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN))
1826 return false; /* read_callback_ sets the state for us */
1827 index->number = (FLAC__byte)x;
1829 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN))
1830 return false; /* read_callback_ sets the state for us */
1839 FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj)
1843 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1846 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_TYPE_LEN))
1847 return false; /* read_callback_ sets the state for us */
1850 /* read MIME type */
1851 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN))
1852 return false; /* read_callback_ sets the state for us */
1853 if(0 == (obj->mime_type = (char*)malloc(x+1))) {
1854 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1858 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->mime_type, x))
1859 return false; /* read_callback_ sets the state for us */
1861 obj->mime_type[x] = '\0';
1863 /* read description */
1864 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN))
1865 return false; /* read_callback_ sets the state for us */
1866 if(0 == (obj->description = (FLAC__byte*)malloc(x+1))) {
1867 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1871 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->description, x))
1872 return false; /* read_callback_ sets the state for us */
1874 obj->description[x] = '\0';
1877 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->width, FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN))
1878 return false; /* read_callback_ sets the state for us */
1881 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->height, FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN))
1882 return false; /* read_callback_ sets the state for us */
1885 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->depth, FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN))
1886 return false; /* read_callback_ sets the state for us */
1889 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->colors, FLAC__STREAM_METADATA_PICTURE_COLORS_LEN))
1890 return false; /* read_callback_ sets the state for us */
1893 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &(obj->data_length), FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN))
1894 return false; /* read_callback_ sets the state for us */
1895 if(0 == (obj->data = (FLAC__byte*)malloc(obj->data_length))) {
1896 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1899 if(obj->data_length > 0) {
1900 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->data, obj->data_length))
1901 return false; /* read_callback_ sets the state for us */
1907 FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder)
1912 /* skip the version and flags bytes */
1913 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 24))
1914 return false; /* read_callback_ sets the state for us */
1915 /* get the size (in bytes) to skip */
1917 for(i = 0; i < 4; i++) {
1918 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1919 return false; /* read_callback_ sets the state for us */
1923 /* skip the rest of the tag */
1924 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, skip))
1925 return false; /* read_callback_ sets the state for us */
1929 FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder)
1932 FLAC__bool first = true;
1934 /* If we know the total number of samples in the stream, stop if we've read that many. */
1935 /* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */
1936 if(FLAC__stream_decoder_get_total_samples(decoder) > 0) {
1937 if(decoder->private_->samples_decoded >= FLAC__stream_decoder_get_total_samples(decoder)) {
1938 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1943 /* make sure we're byte aligned */
1944 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) {
1945 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input)))
1946 return false; /* read_callback_ sets the state for us */
1950 if(decoder->private_->cached) {
1951 x = (FLAC__uint32)decoder->private_->lookahead;
1952 decoder->private_->cached = false;
1955 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1956 return false; /* read_callback_ sets the state for us */
1958 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1959 decoder->private_->header_warmup[0] = (FLAC__byte)x;
1960 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1961 return false; /* read_callback_ sets the state for us */
1963 /* 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 */
1964 /* else we have to check if the second byte is the end of a sync code */
1965 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1966 decoder->private_->lookahead = (FLAC__byte)x;
1967 decoder->private_->cached = true;
1969 else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
1970 decoder->private_->header_warmup[1] = (FLAC__byte)x;
1971 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
1976 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
1984 FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode)
1988 FLAC__int32 mid, side;
1989 unsigned frame_crc; /* the one we calculate from the input stream */
1992 *got_a_frame = false;
1996 frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc);
1997 frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc);
1998 FLAC__bitreader_reset_read_crc16(decoder->private_->input, (FLAC__uint16)frame_crc);
2000 if(!read_frame_header_(decoder))
2002 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means we didn't sync on a valid header */
2004 if(!allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels))
2006 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
2008 * first figure the correct bits-per-sample of the subframe
2010 unsigned bps = decoder->private_->frame.header.bits_per_sample;
2011 switch(decoder->private_->frame.header.channel_assignment) {
2012 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
2013 /* no adjustment needed */
2015 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
2016 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2020 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
2021 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2025 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
2026 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2036 if(!read_subframe_(decoder, channel, bps, do_full_decode))
2038 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2041 if(!read_zero_padding_(decoder))
2045 * Read the frame CRC-16 from the footer and check
2047 frame_crc = FLAC__bitreader_get_read_crc16(decoder->private_->input);
2048 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN))
2049 return false; /* read_callback_ sets the state for us */
2050 if(frame_crc == x) {
2051 if(do_full_decode) {
2052 /* Undo any special channel coding */
2053 switch(decoder->private_->frame.header.channel_assignment) {
2054 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
2057 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
2058 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2059 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2060 decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i];
2062 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
2063 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2064 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2065 decoder->private_->output[0][i] += decoder->private_->output[1][i];
2067 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
2068 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2069 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2071 mid = decoder->private_->output[0][i];
2072 side = decoder->private_->output[1][i];
2074 mid |= (side & 1); /* i.e. if 'side' is odd... */
2075 decoder->private_->output[0][i] = (mid + side) >> 1;
2076 decoder->private_->output[1][i] = (mid - side) >> 1;
2078 //@@@@@@ OPT: try without 'side' temp variable
2079 mid = (decoder->private_->output[0][i] << 1) | (decoder->private_->output[1][i] & 1); /* i.e. if 'side' is odd... */
2080 decoder->private_->output[0][i] = (mid + decoder->private_->output[1][i]) >> 1;
2081 decoder->private_->output[1][i] = (mid - decoder->private_->output[1][i]) >> 1;
2092 /* Bad frame, emit error and zero the output signal */
2093 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH);
2094 if(do_full_decode) {
2095 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
2096 memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
2101 *got_a_frame = true;
2103 /* put the latest values into the public section of the decoder instance */
2104 decoder->protected_->channels = decoder->private_->frame.header.channels;
2105 decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment;
2106 decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample;
2107 decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate;
2108 decoder->protected_->blocksize = decoder->private_->frame.header.blocksize;
2110 FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
2111 decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize;
2114 if(do_full_decode) {
2115 if(write_audio_frame_to_client_(decoder, &decoder->private_->frame, (const FLAC__int32 * const *)decoder->private_->output) != FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE)
2119 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2123 FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder)
2127 unsigned i, blocksize_hint = 0, sample_rate_hint = 0;
2128 FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */
2129 unsigned raw_header_len;
2130 FLAC__bool is_unparseable = false;
2131 const FLAC__bool is_known_variable_blocksize_stream = (decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.min_blocksize != decoder->private_->stream_info.data.stream_info.max_blocksize);
2132 const FLAC__bool is_known_fixed_blocksize_stream = (decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.min_blocksize == decoder->private_->stream_info.data.stream_info.max_blocksize);
2134 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
2136 /* init the raw header with the saved bits from synchronization */
2137 raw_header[0] = decoder->private_->header_warmup[0];
2138 raw_header[1] = decoder->private_->header_warmup[1];
2142 * check to make sure that the reserved bits are 0
2144 if(raw_header[1] & 0x03) { /* MAGIC NUMBER */
2145 is_unparseable = true;
2149 * Note that along the way as we read the header, we look for a sync
2150 * code inside. If we find one it would indicate that our original
2151 * sync was bad since there cannot be a sync code in a valid header.
2153 * Three kinds of things can go wrong when reading the frame header:
2154 * 1) We may have sync'ed incorrectly and not landed on a frame header.
2155 * If we don't find a sync code, it can end up looking like we read
2156 * a valid but unparseable header, until getting to the frame header
2157 * CRC. Even then we could get a false positive on the CRC.
2158 * 2) We may have sync'ed correctly but on an unparseable frame (from a
2160 * 3) We may be on a damaged frame which appears valid but unparseable.
2162 * For all these reasons, we try and read a complete frame header as
2163 * long as it seems valid, even if unparseable, up until the frame
2168 * read in the raw header as bytes so we can CRC it, and parse it on the way
2170 for(i = 0; i < 2; i++) {
2171 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2172 return false; /* read_callback_ sets the state for us */
2173 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
2174 /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */
2175 decoder->private_->lookahead = (FLAC__byte)x;
2176 decoder->private_->cached = true;
2177 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2178 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2181 raw_header[raw_header_len++] = (FLAC__byte)x;
2184 switch(x = raw_header[2] >> 4) {
2186 if(is_known_fixed_blocksize_stream)
2187 decoder->private_->frame.header.blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize;
2189 is_unparseable = true;
2192 decoder->private_->frame.header.blocksize = 192;
2198 decoder->private_->frame.header.blocksize = 576 << (x-2);
2212 decoder->private_->frame.header.blocksize = 256 << (x-8);
2219 switch(x = raw_header[2] & 0x0f) {
2221 if(decoder->private_->has_stream_info)
2222 decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate;
2224 is_unparseable = true;
2229 is_unparseable = true;
2232 decoder->private_->frame.header.sample_rate = 8000;
2235 decoder->private_->frame.header.sample_rate = 16000;
2238 decoder->private_->frame.header.sample_rate = 22050;
2241 decoder->private_->frame.header.sample_rate = 24000;
2244 decoder->private_->frame.header.sample_rate = 32000;
2247 decoder->private_->frame.header.sample_rate = 44100;
2250 decoder->private_->frame.header.sample_rate = 48000;
2253 decoder->private_->frame.header.sample_rate = 96000;
2258 sample_rate_hint = x;
2261 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2262 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2268 x = (unsigned)(raw_header[3] >> 4);
2270 decoder->private_->frame.header.channels = 2;
2273 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE;
2276 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE;
2279 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE;
2282 is_unparseable = true;
2287 decoder->private_->frame.header.channels = (unsigned)x + 1;
2288 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT;
2291 switch(x = (unsigned)(raw_header[3] & 0x0e) >> 1) {
2293 if(decoder->private_->has_stream_info)
2294 decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample;
2296 is_unparseable = true;
2299 decoder->private_->frame.header.bits_per_sample = 8;
2302 decoder->private_->frame.header.bits_per_sample = 12;
2305 decoder->private_->frame.header.bits_per_sample = 16;
2308 decoder->private_->frame.header.bits_per_sample = 20;
2311 decoder->private_->frame.header.bits_per_sample = 24;
2315 is_unparseable = true;
2322 if(raw_header[3] & 0x01) { /* this should be a zero padding bit */
2323 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2324 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2329 * Now we get to the regrettable consequences of not knowing for sure
2330 * whether we got a frame number or a sample number. There are no
2331 * encoders that do variable-blocksize encoding so unless we know from
2332 * the STREAMINFO that it is variable-blocksize we will assume it is
2333 * fixed-blocksize. The trouble comes when we have no STREAMINFO; again
2334 * we will guess that is fixed-blocksize. Where this can go wrong: 1) a
2335 * variable-blocksize stream with no STREAMINFO; 2) a fixed-blocksize
2336 * stream that was edited such that one or more frames before or
2337 * including this one do not have the same number of samples as the
2338 * STREAMINFO's min and max blocksize.
2340 if(is_known_variable_blocksize_stream) {
2341 if(blocksize_hint) {
2342 if(!FLAC__bitreader_read_utf8_uint64(decoder->private_->input, &xx, raw_header, &raw_header_len))
2343 return false; /* read_callback_ sets the state for us */
2344 if(xx == FLAC__U64L(0xffffffffffffffff)) { /* i.e. non-UTF8 code... */
2345 decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
2346 decoder->private_->cached = true;
2347 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2348 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2351 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
2352 decoder->private_->frame.header.number.sample_number = xx;
2355 is_unparseable = true;
2358 if(!FLAC__bitreader_read_utf8_uint32(decoder->private_->input, &x, raw_header, &raw_header_len))
2359 return false; /* read_callback_ sets the state for us */
2360 if(x == 0xffffffff) { /* i.e. non-UTF8 code... */
2361 decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
2362 decoder->private_->cached = true;
2363 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2364 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2367 decoder->private_->last_frame_number = x;
2368 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
2369 if(decoder->private_->has_stream_info) {
2370 FLAC__ASSERT(decoder->private_->stream_info.data.stream_info.min_blocksize == decoder->private_->stream_info.data.stream_info.max_blocksize);
2371 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__uint64)x;
2372 decoder->private_->last_block_size = decoder->private_->frame.header.blocksize;
2374 else if(blocksize_hint) {
2375 if(decoder->private_->last_block_size)
2376 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->last_block_size * (FLAC__uint64)x;
2378 is_unparseable = true;
2381 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->frame.header.blocksize * (FLAC__uint64)x;
2382 decoder->private_->last_block_size = decoder->private_->frame.header.blocksize;
2386 if(blocksize_hint) {
2387 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2388 return false; /* read_callback_ sets the state for us */
2389 raw_header[raw_header_len++] = (FLAC__byte)x;
2390 if(blocksize_hint == 7) {
2392 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8))
2393 return false; /* read_callback_ sets the state for us */
2394 raw_header[raw_header_len++] = (FLAC__byte)_x;
2397 decoder->private_->frame.header.blocksize = x+1;
2400 if(sample_rate_hint) {
2401 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2402 return false; /* read_callback_ sets the state for us */
2403 raw_header[raw_header_len++] = (FLAC__byte)x;
2404 if(sample_rate_hint != 12) {
2406 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8))
2407 return false; /* read_callback_ sets the state for us */
2408 raw_header[raw_header_len++] = (FLAC__byte)_x;
2411 if(sample_rate_hint == 12)
2412 decoder->private_->frame.header.sample_rate = x*1000;
2413 else if(sample_rate_hint == 13)
2414 decoder->private_->frame.header.sample_rate = x;
2416 decoder->private_->frame.header.sample_rate = x*10;
2419 /* read the CRC-8 byte */
2420 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2421 return false; /* read_callback_ sets the state for us */
2422 crc8 = (FLAC__byte)x;
2424 if(FLAC__crc8(raw_header, raw_header_len) != crc8) {
2425 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2426 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2430 if(is_unparseable) {
2431 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2432 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2439 FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode)
2442 FLAC__bool wasted_bits;
2445 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) /* MAGIC NUMBER */
2446 return false; /* read_callback_ sets the state for us */
2448 wasted_bits = (x & 1);
2453 if(!FLAC__bitreader_read_unary_unsigned(decoder->private_->input, &u))
2454 return false; /* read_callback_ sets the state for us */
2455 decoder->private_->frame.subframes[channel].wasted_bits = u+1;
2456 bps -= decoder->private_->frame.subframes[channel].wasted_bits;
2459 decoder->private_->frame.subframes[channel].wasted_bits = 0;
2462 * Lots of magic numbers here
2465 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2466 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2470 if(!read_subframe_constant_(decoder, channel, bps, do_full_decode))
2474 if(!read_subframe_verbatim_(decoder, channel, bps, do_full_decode))
2478 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2479 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2483 if(!read_subframe_fixed_(decoder, channel, bps, (x>>1)&7, do_full_decode))
2485 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2489 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2490 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2494 if(!read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1, do_full_decode))
2496 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2500 if(wasted_bits && do_full_decode) {
2501 x = decoder->private_->frame.subframes[channel].wasted_bits;
2502 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2503 decoder->private_->output[channel][i] <<= x;
2509 FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode)
2511 FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant;
2514 FLAC__int32 *output = decoder->private_->output[channel];
2516 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT;
2518 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps))
2519 return false; /* read_callback_ sets the state for us */
2521 subframe->value = x;
2523 /* decode the subframe */
2524 if(do_full_decode) {
2525 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2532 FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode)
2534 FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed;
2539 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED;
2541 subframe->residual = decoder->private_->residual[channel];
2542 subframe->order = order;
2544 /* read warm-up samples */
2545 for(u = 0; u < order; u++) {
2546 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps))
2547 return false; /* read_callback_ sets the state for us */
2548 subframe->warmup[u] = i32;
2551 /* read entropy coding method info */
2552 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN))
2553 return false; /* read_callback_ sets the state for us */
2554 subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
2555 switch(subframe->entropy_coding_method.type) {
2556 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2557 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
2558 return false; /* read_callback_ sets the state for us */
2559 subframe->entropy_coding_method.data.partitioned_rice.order = u32;
2560 subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
2563 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2564 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2569 switch(subframe->entropy_coding_method.type) {
2570 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2571 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]))
2578 /* decode the subframe */
2579 if(do_full_decode) {
2580 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
2581 FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order);
2587 FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode)
2589 FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc;
2594 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC;
2596 subframe->residual = decoder->private_->residual[channel];
2597 subframe->order = order;
2599 /* read warm-up samples */
2600 for(u = 0; u < order; u++) {
2601 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps))
2602 return false; /* read_callback_ sets the state for us */
2603 subframe->warmup[u] = i32;
2606 /* read qlp coeff precision */
2607 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN))
2608 return false; /* read_callback_ sets the state for us */
2609 if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) {
2610 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2611 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2614 subframe->qlp_coeff_precision = u32+1;
2616 /* read qlp shift */
2617 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN))
2618 return false; /* read_callback_ sets the state for us */
2619 subframe->quantization_level = i32;
2621 /* read quantized lp coefficiencts */
2622 for(u = 0; u < order; u++) {
2623 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision))
2624 return false; /* read_callback_ sets the state for us */
2625 subframe->qlp_coeff[u] = i32;
2628 /* read entropy coding method info */
2629 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN))
2630 return false; /* read_callback_ sets the state for us */
2631 subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
2632 switch(subframe->entropy_coding_method.type) {
2633 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2634 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
2635 return false; /* read_callback_ sets the state for us */
2636 subframe->entropy_coding_method.data.partitioned_rice.order = u32;
2637 subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
2640 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2641 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2646 switch(subframe->entropy_coding_method.type) {
2647 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2648 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]))
2655 /* decode the subframe */
2656 if(do_full_decode) {
2657 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
2658 /*@@@@@@ technically not pessimistic enough, should be more like
2659 if( (FLAC__uint64)order * ((((FLAC__uint64)1)<<bps)-1) * ((1<<subframe->qlp_coeff_precision)-1) < (((FLAC__uint64)-1) << 32) )
2661 if(bps + subframe->qlp_coeff_precision + FLAC__bitmath_ilog2(order) <= 32)
2662 if(bps <= 16 && subframe->qlp_coeff_precision <= 16) {
2664 decoder->private_->local_lpc_restore_signal_16bit_order8(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2666 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);
2669 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);
2671 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);
2677 FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode)
2679 FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim;
2680 FLAC__int32 x, *residual = decoder->private_->residual[channel];
2683 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM;
2685 subframe->data = residual;
2687 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2688 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps))
2689 return false; /* read_callback_ sets the state for us */
2693 /* decode the subframe */
2695 memcpy(decoder->private_->output[channel], subframe->data, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
2700 FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, unsigned partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual)
2702 FLAC__uint32 rice_parameter;
2704 unsigned partition, sample, u;
2705 const unsigned partitions = 1u << partition_order;
2706 const unsigned partition_samples = partition_order > 0? decoder->private_->frame.header.blocksize >> partition_order : decoder->private_->frame.header.blocksize - predictor_order;
2709 if(partition_order == 0) {
2710 if(decoder->private_->frame.header.blocksize < predictor_order) {
2711 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2712 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2717 if(partition_samples < predictor_order) {
2718 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2719 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2724 if(!FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(partitioned_rice_contents, max(6, partition_order))) {
2725 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
2730 for(partition = 0; partition < partitions; partition++) {
2731 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN))
2732 return false; /* read_callback_ sets the state for us */
2733 partitioned_rice_contents->parameters[partition] = rice_parameter;
2734 if(rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
2735 u = (partition_order == 0 || partition > 0)? partition_samples : partition_samples - predictor_order;
2736 if(!decoder->private_->local_bitreader_read_rice_signed_block(decoder->private_->input, residual + sample, u, rice_parameter))
2737 return false; /* read_callback_ sets the state for us */
2741 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN))
2742 return false; /* read_callback_ sets the state for us */
2743 partitioned_rice_contents->raw_bits[partition] = rice_parameter;
2744 for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
2745 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i, rice_parameter))
2746 return false; /* read_callback_ sets the state for us */
2747 residual[sample] = i;
2755 FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder)
2757 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) {
2758 FLAC__uint32 zero = 0;
2759 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &zero, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input)))
2760 return false; /* read_callback_ sets the state for us */
2762 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2763 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2769 FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data)
2771 FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data;
2775 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */
2776 !decoder->private_->is_ogg &&
2778 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data)
2781 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
2784 else if(*bytes > 0) {
2785 /* While seeking, it is possible for our seek to land in the
2786 * middle of audio data that looks exactly like a frame header
2787 * from a future version of an encoder. When that happens, our
2788 * error callback will get an
2789 * FLAC__STREAM_DECODER_UNPARSEABLE_STREAM and increment its
2790 * unparseable_frame_count. But there is a remote possibility
2791 * that it is properly synced at such a "future-codec frame",
2792 * so to make sure, we wait to see many "unparseable" errors in
2793 * a row before bailing out.
2795 if(decoder->private_->is_seeking && decoder->private_->unparseable_frame_count > 20) {
2796 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2800 const FLAC__StreamDecoderReadStatus status =
2802 decoder->private_->is_ogg?
2803 read_callback_ogg_aspect_(decoder, buffer, bytes) :
2805 decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data)
2807 if(status == FLAC__STREAM_DECODER_READ_STATUS_ABORT) {
2808 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2811 else if(*bytes == 0) {
2813 status == FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM ||
2816 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */
2817 !decoder->private_->is_ogg &&
2819 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data)
2822 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
2833 /* abort to avoid a deadlock */
2834 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2837 /* [1] @@@ HACK NOTE: The end-of-stream checking has to be hacked around
2838 * for Ogg FLAC. This is because the ogg decoder aspect can lose sync
2839 * and at the same time hit the end of the stream (for example, seeking
2840 * to a point that is after the beginning of the last Ogg page). There
2841 * is no way to report an Ogg sync loss through the callbacks (see note
2842 * in read_callback_ogg_aspect_()) so it returns CONTINUE with *bytes==0.
2843 * So to keep the decoder from stopping at this point we gate the call
2844 * to the eof_callback and let the Ogg decoder aspect set the
2845 * end-of-stream state when it is needed.
2850 FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes)
2852 switch(FLAC__ogg_decoder_aspect_read_callback_wrapper(&decoder->protected_->ogg_decoder_aspect, buffer, bytes, read_callback_proxy_, decoder, decoder->private_->client_data)) {
2853 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK:
2854 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
2855 /* we don't really have a way to handle lost sync via read
2856 * callback so we'll let it pass and let the underlying
2857 * FLAC decoder catch the error
2859 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_LOST_SYNC:
2860 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
2861 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM:
2862 return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
2863 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_NOT_FLAC:
2864 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_UNSUPPORTED_MAPPING_VERSION:
2865 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT:
2866 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ERROR:
2867 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_MEMORY_ALLOCATION_ERROR:
2868 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
2871 /* double protection */
2872 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
2876 FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
2878 FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder*)void_decoder;
2880 switch(decoder->private_->read_callback(decoder, buffer, bytes, client_data)) {
2881 case FLAC__STREAM_DECODER_READ_STATUS_CONTINUE:
2882 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK;
2883 case FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM:
2884 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM;
2885 case FLAC__STREAM_DECODER_READ_STATUS_ABORT:
2886 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT;
2888 /* double protection: */
2890 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT;
2895 FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[])
2897 if(decoder->private_->is_seeking) {
2898 FLAC__uint64 this_frame_sample = frame->header.number.sample_number;
2899 FLAC__uint64 next_frame_sample = this_frame_sample + (FLAC__uint64)frame->header.blocksize;
2900 FLAC__uint64 target_sample = decoder->private_->target_sample;
2902 FLAC__ASSERT(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
2905 decoder->private_->got_a_frame = true;
2907 decoder->private_->last_frame = *frame; /* save the frame */
2908 if(this_frame_sample <= target_sample && target_sample < next_frame_sample) { /* we hit our target frame */
2909 unsigned delta = (unsigned)(target_sample - this_frame_sample);
2910 /* kick out of seek mode */
2911 decoder->private_->is_seeking = false;
2912 /* shift out the samples before target_sample */
2915 const FLAC__int32 *newbuffer[FLAC__MAX_CHANNELS];
2916 for(channel = 0; channel < frame->header.channels; channel++)
2917 newbuffer[channel] = buffer[channel] + delta;
2918 decoder->private_->last_frame.header.blocksize -= delta;
2919 decoder->private_->last_frame.header.number.sample_number += (FLAC__uint64)delta;
2920 /* write the relevant samples */
2921 return decoder->private_->write_callback(decoder, &decoder->private_->last_frame, newbuffer, decoder->private_->client_data);
2924 /* write the relevant samples */
2925 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data);
2929 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
2934 * If we never got STREAMINFO, turn off MD5 checking to save
2935 * cycles since we don't have a sum to compare to anyway
2937 if(!decoder->private_->has_stream_info)
2938 decoder->private_->do_md5_checking = false;
2939 if(decoder->private_->do_md5_checking) {
2940 if(!FLAC__MD5Accumulate(&decoder->private_->md5context, buffer, frame->header.channels, frame->header.blocksize, (frame->header.bits_per_sample+7) / 8))
2941 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
2943 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data);
2947 void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status)
2949 if(!decoder->private_->is_seeking)
2950 decoder->private_->error_callback(decoder, status, decoder->private_->client_data);
2951 else if(status == FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM)
2952 decoder->private_->unparseable_frame_count++;
2955 FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample)
2957 FLAC__uint64 first_frame_offset = decoder->private_->first_frame_offset, lower_bound, upper_bound, lower_bound_sample, upper_bound_sample, this_frame_sample;
2958 FLAC__int64 pos = -1;
2960 unsigned approx_bytes_per_frame;
2961 FLAC__bool first_seek = true;
2962 const FLAC__uint64 total_samples = FLAC__stream_decoder_get_total_samples(decoder);
2963 const unsigned min_blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize;
2964 const unsigned max_blocksize = decoder->private_->stream_info.data.stream_info.max_blocksize;
2965 const unsigned max_framesize = decoder->private_->stream_info.data.stream_info.max_framesize;
2966 const unsigned min_framesize = decoder->private_->stream_info.data.stream_info.min_framesize;
2967 /* take these from the current frame in case they've changed mid-stream */
2968 unsigned channels = FLAC__stream_decoder_get_channels(decoder);
2969 unsigned bps = FLAC__stream_decoder_get_bits_per_sample(decoder);
2970 const FLAC__StreamMetadata_SeekTable *seek_table = decoder->private_->has_seek_table? &decoder->private_->seek_table.data.seek_table : 0;
2972 /* use values from stream info if we didn't decode a frame */
2974 channels = decoder->private_->stream_info.data.stream_info.channels;
2976 bps = decoder->private_->stream_info.data.stream_info.bits_per_sample;
2978 /* we are just guessing here */
2979 if(max_framesize > 0)
2980 approx_bytes_per_frame = (max_framesize + min_framesize) / 2 + 1;
2983 * Check if it's a known fixed-blocksize stream. Note that though
2984 * the spec doesn't allow zeroes in the STREAMINFO block, we may
2985 * never get a STREAMINFO block when decoding so the value of
2986 * min_blocksize might be zero.
2988 else if(min_blocksize == max_blocksize && min_blocksize > 0) {
2989 /* note there are no () around 'bps/8' to keep precision up since it's an integer calulation */
2990 approx_bytes_per_frame = min_blocksize * channels * bps/8 + 64;
2993 approx_bytes_per_frame = 4096 * channels * bps/8 + 64;
2996 * First, we set an upper and lower bound on where in the
2997 * stream we will search. For now we assume the worst case
2998 * scenario, which is our best guess at the beginning of
2999 * the first frame and end of the stream.
3001 lower_bound = first_frame_offset;
3002 lower_bound_sample = 0;
3003 upper_bound = stream_length;
3004 upper_bound_sample = total_samples > 0 ? total_samples : target_sample;
3005 if(upper_bound_sample == 0)
3006 upper_bound_sample = 1;
3009 * Now we refine the bounds if we have a seektable with
3010 * suitable points. Note that according to the spec they
3011 * must be ordered by ascending sample number.
3014 /* find the closest seek point <= target_sample, if it exists */
3015 for(i = (int)seek_table->num_points - 1; i >= 0; i--) {
3016 if(seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER && seek_table->points[i].sample_number <= target_sample)
3019 if(i >= 0) { /* i.e. we found a suitable seek point... */
3020 lower_bound = first_frame_offset + seek_table->points[i].stream_offset;
3021 lower_bound_sample = seek_table->points[i].sample_number;
3024 /* find the closest seek point > target_sample, if it exists */
3025 for(i = 0; i < (int)seek_table->num_points; i++) {
3026 if(seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER && seek_table->points[i].sample_number > target_sample)
3029 if(i < (int)seek_table->num_points) { /* i.e. we found a suitable seek point... */
3030 upper_bound = first_frame_offset + seek_table->points[i].stream_offset;
3031 upper_bound_sample = seek_table->points[i].sample_number;
3035 decoder->private_->target_sample = target_sample;
3037 /* check if the bounds are still ok */
3038 if (lower_bound_sample >= upper_bound_sample || lower_bound > upper_bound) {
3039 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3042 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3043 #if defined _MSC_VER || defined __MINGW32__
3044 /* with VC++ you have to spoon feed it the casting */
3045 pos = (FLAC__int64)lower_bound + (FLAC__int64)((FLAC__double)(FLAC__int64)(target_sample - lower_bound_sample) / (FLAC__double)(FLAC__int64)(upper_bound_sample - lower_bound_sample) * (FLAC__double)(FLAC__int64)(upper_bound - lower_bound)) - approx_bytes_per_frame;
3047 pos = (FLAC__int64)lower_bound + (FLAC__int64)((FLAC__double)(target_sample - lower_bound_sample) / (FLAC__double)(upper_bound_sample - lower_bound_sample) * (FLAC__double)(upper_bound - lower_bound)) - approx_bytes_per_frame;
3050 /* a little less accurate: */
3051 if(upper_bound - lower_bound < 0xffffffff)
3052 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;
3053 else /* @@@ WATCHOUT, ~2TB limit */
3054 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;
3056 if(pos >= (FLAC__int64)upper_bound)
3057 pos = (FLAC__int64)upper_bound - 1;
3058 if(pos < (FLAC__int64)lower_bound)
3059 pos = (FLAC__int64)lower_bound;
3060 if(decoder->private_->seek_callback(decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) {
3061 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3064 if(!FLAC__stream_decoder_flush(decoder)) {
3065 /* above call sets the state for us */
3068 /* Now we need to get a frame. First we need to reset our
3069 * unparseable_frame_count; if we get too many unparseable
3070 * frames in a row, the read callback will return
3071 * FLAC__STREAM_DECODER_READ_STATUS_ABORT, causing
3072 * FLAC__stream_decoder_process_single() to return false.
3074 decoder->private_->unparseable_frame_count = 0;
3075 if(!FLAC__stream_decoder_process_single(decoder)) {
3076 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3079 /* our write callback will change the state when it gets to the target frame */
3080 /* 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 */
3082 /*@@@@@@ used to be the following; not clear if the check for end of stream is needed anymore */
3083 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING && decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM)
3086 if(!decoder->private_->is_seeking) {
3089 this_frame_sample = decoder->private_->last_frame.header.number.sample_number;
3091 if (!decoder->private_->samples_decoded || (this_frame_sample + decoder->private_->last_frame.header.blocksize >= upper_bound_sample && !first_seek)) {
3092 if (pos == (FLAC__int64)lower_bound) {
3093 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3096 /* our last move backwards wasn't big enough, try again */
3097 approx_bytes_per_frame *= 2;
3100 /* allow one seek over upper bound, required for streams with unknown total_samples */
3103 /* make sure we are not seeking in corrupted stream */
3104 if (this_frame_sample < lower_bound_sample) {
3105 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3109 FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
3111 /* we need to narrow the search */
3112 if(target_sample < this_frame_sample) {
3113 upper_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize;
3114 if(!FLAC__stream_decoder_get_decode_position(decoder, &upper_bound)) {
3115 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3118 approx_bytes_per_frame = (unsigned)(2 * (upper_bound - pos) / 3 + 16);
3121 /* target_sample >= this_frame_sample + this frame's blocksize */
3123 lower_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize;
3124 if(!FLAC__stream_decoder_get_decode_position(decoder, &lower_bound)) {
3125 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3128 approx_bytes_per_frame = (unsigned)(2 * (lower_bound - pos) / 3 + 16);
3136 FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample)
3138 FLAC__uint64 left_pos = 0, right_pos = stream_length;
3139 FLAC__uint64 left_sample = 0, right_sample = FLAC__stream_decoder_get_total_samples(decoder);
3140 FLAC__uint64 this_frame_sample = 0; /* only initialized to avoid compiler warning */
3141 FLAC__uint64 pos = 0; /* only initialized to avoid compiler warning */
3142 FLAC__bool did_a_seek;
3143 unsigned iteration = 0;
3145 /* In the first iterations, we will calculate the target byte position
3146 * by the distance from the target sample to left_sample and
3147 * right_sample (let's call it "proportional search"). After that, we
3148 * will switch to binary search.
3150 unsigned BINARY_SEARCH_AFTER_ITERATION = 2;
3152 /* We will switch to a linear search once our current sample is less
3153 * than this number of samples ahead of the target sample
3155 static const FLAC__uint64 LINEAR_SEARCH_WITHIN_SAMPLES = FLAC__MAX_BLOCK_SIZE * 2;
3157 /* If the total number of samples is unknown, use a large value, and
3158 * force binary search immediately.
3160 if(right_sample == 0) {
3161 right_sample = (FLAC__uint64)(-1);
3162 BINARY_SEARCH_AFTER_ITERATION = 0;
3165 decoder->private_->target_sample = target_sample;
3166 for( ; ; iteration++) {
3167 if (iteration == 0 || this_frame_sample > target_sample || target_sample - this_frame_sample > LINEAR_SEARCH_WITHIN_SAMPLES) {
3168 if (iteration >= BINARY_SEARCH_AFTER_ITERATION) {
3169 pos = (right_pos + left_pos) / 2;
3172 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3173 #if defined _MSC_VER || defined __MINGW32__
3174 /* with MSVC you have to spoon feed it the casting */
3175 pos = (FLAC__uint64)((FLAC__double)(FLAC__int64)(target_sample - left_sample) / (FLAC__double)(FLAC__int64)(right_sample - left_sample) * (FLAC__double)(FLAC__int64)(right_pos - left_pos));
3177 pos = (FLAC__uint64)((FLAC__double)(target_sample - left_sample) / (FLAC__double)(right_sample - left_sample) * (FLAC__double)(right_pos - left_pos));
3180 /* a little less accurate: */
3181 if ((target_sample-left_sample <= 0xffffffff) && (right_pos-left_pos <= 0xffffffff))
3182 pos = (FLAC__int64)(((target_sample-left_sample) * (right_pos-left_pos)) / (right_sample-left_sample));
3183 else /* @@@ WATCHOUT, ~2TB limit */
3184 pos = (FLAC__int64)((((target_sample-left_sample)>>8) * ((right_pos-left_pos)>>8)) / ((right_sample-left_sample)>>16));
3186 /* @@@ TODO: might want to limit pos to some distance
3187 * before EOF, to make sure we land before the last frame,
3188 * thereby getting a this_frame_sample and so having a better
3189 * estimate. @@@@@@DELETE:this would also mostly (or totally if we could
3190 * be sure to land before the last frame) avoid the
3191 * end-of-stream case we have to check later.
3196 if(decoder->private_->seek_callback((FLAC__StreamDecoder*)decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) {
3197 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3200 if(!FLAC__stream_decoder_flush(decoder)) {
3201 /* above call sets the state for us */
3209 decoder->private_->got_a_frame = false;
3210 if(!FLAC__stream_decoder_process_single(decoder)) {
3211 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3214 if(!decoder->private_->got_a_frame) {
3216 /* this can happen if we seek to a point after the last frame; we drop
3217 * to binary search right away in this case to avoid any wasted
3218 * iterations of proportional search.
3221 BINARY_SEARCH_AFTER_ITERATION = 0;
3224 /* this can probably only happen if total_samples is unknown and the
3225 * target_sample is past the end of the stream
3227 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3231 /* our write callback will change the state when it gets to the target frame */
3232 else if(!decoder->private_->is_seeking/*@@@@@@ && decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM*/) {
3236 this_frame_sample = decoder->private_->last_frame.header.number.sample_number;
3237 FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
3240 if (this_frame_sample <= target_sample) {
3241 /* The 'equal' case should not happen, since
3242 * FLAC__stream_decoder_process_single()
3243 * should recognize that it has hit the
3244 * target sample and we would exit through
3245 * the 'break' above.
3247 FLAC__ASSERT(this_frame_sample != target_sample);
3249 left_sample = this_frame_sample;
3250 /* sanity check to avoid infinite loop */
3251 if (left_pos == pos) {
3252 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3257 else if(this_frame_sample > target_sample) {
3258 right_sample = this_frame_sample;
3259 /* sanity check to avoid infinite loop */
3260 if (right_pos == pos) {
3261 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3274 FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
3279 *bytes = fread(buffer, sizeof(FLAC__byte), *bytes, decoder->private_->file);
3280 if(ferror(decoder->private_->file))
3281 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
3282 else if(*bytes == 0)
3283 return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
3285 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
3288 return FLAC__STREAM_DECODER_READ_STATUS_ABORT; /* abort to avoid a deadlock */
3291 FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data)
3295 if(decoder->private_->file == stdin)
3296 return FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED;
3297 else if(fseeko(decoder->private_->file, (off_t)absolute_byte_offset, SEEK_SET) < 0)
3298 return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR;
3300 return FLAC__STREAM_DECODER_SEEK_STATUS_OK;
3303 FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data)
3308 if(decoder->private_->file == stdin)
3309 return FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED;
3310 else if((pos = ftello(decoder->private_->file)) < 0)
3311 return FLAC__STREAM_DECODER_TELL_STATUS_ERROR;
3313 *absolute_byte_offset = (FLAC__uint64)pos;
3314 return FLAC__STREAM_DECODER_TELL_STATUS_OK;
3318 FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data)
3320 struct stat filestats;
3323 if(decoder->private_->file == stdin)
3324 return FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED;
3325 else if(fstat(fileno(decoder->private_->file), &filestats) != 0)
3326 return FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR;
3328 *stream_length = (FLAC__uint64)filestats.st_size;
3329 return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
3333 FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data)
3337 return feof(decoder->private_->file)? true : false;