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diff --git a/apps/codecs/libFLAC/seekable_stream_decoder.c b/apps/codecs/libFLAC/seekable_stream_decoder.c
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--- a/apps/codecs/libFLAC/seekable_stream_decoder.c
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1/* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2000,2001,2002,2003,2004,2005 Josh Coalson
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * - Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * - Neither the name of the Xiph.org Foundation nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <stdio.h>
33#include "global.h" /* for calloc() */
34#include <string.h> /* for memcpy()/memcmp() */
35#include "FLAC/assert.h"
36#include "protected/seekable_stream_decoder.h"
37#include "protected/stream_decoder.h"
38#include "private/float.h" /* for FLAC__double */
39#include "private/md5.h"
40
41/* adjust for compilers that can't understand using LLU suffix for uint64_t literals */
42#ifdef _MSC_VER
43#define FLAC__U64L(x) x
44#else
45#define FLAC__U64L(x) x##LLU
46#endif
47
48/***********************************************************************
49 *
50 * Private class method prototypes
51 *
52 ***********************************************************************/
53
54static void set_defaults_(FLAC__SeekableStreamDecoder *decoder);
55static FLAC__StreamDecoderReadStatus read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data);
56static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
57static void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
58static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
59static FLAC__bool seek_to_absolute_sample_(FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample);
60
61/***********************************************************************
62 *
63 * Private class data
64 *
65 ***********************************************************************/
66
67typedef struct FLAC__SeekableStreamDecoderPrivate {
68 FLAC__SeekableStreamDecoderReadCallback read_callback;
69 FLAC__SeekableStreamDecoderSeekCallback seek_callback;
70 FLAC__SeekableStreamDecoderTellCallback tell_callback;
71 FLAC__SeekableStreamDecoderLengthCallback length_callback;
72 FLAC__SeekableStreamDecoderEofCallback eof_callback;
73 FLAC__SeekableStreamDecoderWriteCallback write_callback;
74 FLAC__SeekableStreamDecoderMetadataCallback metadata_callback;
75 FLAC__SeekableStreamDecoderErrorCallback error_callback;
76 void *client_data;
77 FLAC__StreamDecoder *stream_decoder;
78 FLAC__bool do_md5_checking; /* initially gets protected_->md5_checking but is turned off after a seek */
79 struct FLAC__MD5Context md5context;
80 FLAC__byte stored_md5sum[16]; /* this is what is stored in the metadata */
81 FLAC__byte computed_md5sum[16]; /* this is the sum we computed from the decoded data */
82 /* the rest of these are only used for seeking: */
83 FLAC__StreamMetadata_StreamInfo stream_info; /* we keep this around so we can figure out how to seek quickly */
84 const FLAC__StreamMetadata_SeekTable *seek_table; /* we hold a pointer to the stream decoder's seek table for the same reason */
85 /* Since we always want to see the STREAMINFO and SEEK_TABLE blocks at this level, we need some extra flags to keep track of whether they should be passed on up through the metadata_callback */
86 FLAC__bool ignore_stream_info_block;
87 FLAC__bool ignore_seek_table_block;
88 FLAC__Frame last_frame; /* holds the info of the last frame we seeked to */
89 FLAC__uint64 target_sample;
90} FLAC__SeekableStreamDecoderPrivate;
91
92/***********************************************************************
93 *
94 * Public static class data
95 *
96 ***********************************************************************/
97
98FLAC_API const char * const FLAC__SeekableStreamDecoderStateString[] = {
99 "FLAC__SEEKABLE_STREAM_DECODER_OK",
100 "FLAC__SEEKABLE_STREAM_DECODER_SEEKING",
101 "FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM",
102 "FLAC__SEEKABLE_STREAM_DECODER_MEMORY_ALLOCATION_ERROR",
103 "FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR",
104 "FLAC__SEEKABLE_STREAM_DECODER_READ_ERROR",
105 "FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR",
106 "FLAC__SEEKABLE_STREAM_DECODER_ALREADY_INITIALIZED",
107 "FLAC__SEEKABLE_STREAM_DECODER_INVALID_CALLBACK",
108 "FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED"
109};
110
111FLAC_API const char * const FLAC__SeekableStreamDecoderReadStatusString[] = {
112 "FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_OK",
113 "FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_ERROR"
114};
115
116FLAC_API const char * const FLAC__SeekableStreamDecoderSeekStatusString[] = {
117 "FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK",
118 "FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_ERROR"
119};
120
121FLAC_API const char * const FLAC__SeekableStreamDecoderTellStatusString[] = {
122 "FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK",
123 "FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_ERROR"
124};
125
126FLAC_API const char * const FLAC__SeekableStreamDecoderLengthStatusString[] = {
127 "FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK",
128 "FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_ERROR"
129};
130
131
132/***********************************************************************
133 *
134 * Class constructor/destructor
135 *
136 ***********************************************************************/
137
138FLAC__SeekableStreamDecoder _ssd;
139FLAC__SeekableStreamDecoderProtected _ssdprotected IDATA_ATTR;
140FLAC__SeekableStreamDecoderPrivate _ssdprivate IDATA_ATTR;
141
142FLAC_API FLAC__SeekableStreamDecoder *FLAC__seekable_stream_decoder_new(void)
143{
144 FLAC__SeekableStreamDecoder *decoder;
145
146 FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
147
148 decoder = &_ssd;
149 /*decoder = (FLAC__SeekableStreamDecoder*)calloc(1, sizeof(FLAC__SeekableStreamDecoder));
150 if(decoder == 0) {
151 return 0;
152 }*/
153
154 decoder->protected_ = &_ssdprotected;
155 /*decoder->protected_ = (FLAC__SeekableStreamDecoderProtected*)calloc(1, sizeof(FLAC__SeekableStreamDecoderProtected));
156 if(decoder->protected_ == 0) {
157 free(decoder);
158 return 0;
159 }*/
160
161 decoder->private_ = &_ssdprivate;
162 /*decoder->private_ = (FLAC__SeekableStreamDecoderPrivate*)calloc(1, sizeof(FLAC__SeekableStreamDecoderPrivate));
163 if(decoder->private_ == 0) {
164 free(decoder->protected_);
165 free(decoder);
166 return 0;
167 }*/
168
169 decoder->private_->stream_decoder = FLAC__stream_decoder_new();
170 if(0 == decoder->private_->stream_decoder) {
171 /*free(decoder->private_);
172 free(decoder->protected_);
173 free(decoder);*/
174 return 0;
175 }
176
177 set_defaults_(decoder);
178
179 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED;
180
181 return decoder;
182}
183
184FLAC_API void FLAC__seekable_stream_decoder_delete(FLAC__SeekableStreamDecoder *decoder)
185{
186 FLAC__ASSERT(0 != decoder);
187 FLAC__ASSERT(0 != decoder->protected_);
188 FLAC__ASSERT(0 != decoder->private_);
189 FLAC__ASSERT(0 != decoder->private_->stream_decoder);
190
191 (void)FLAC__seekable_stream_decoder_finish(decoder);
192
193 FLAC__stream_decoder_delete(decoder->private_->stream_decoder);
194
195 /*free(decoder->private_);
196 free(decoder->protected_);
197 free(decoder);*/
198}
199
200/***********************************************************************
201 *
202 * Public class methods
203 *
204 ***********************************************************************/
205
206FLAC_API FLAC__SeekableStreamDecoderState FLAC__seekable_stream_decoder_init(FLAC__SeekableStreamDecoder *decoder)
207{
208 FLAC__ASSERT(0 != decoder);
209
210 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
211 return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_ALREADY_INITIALIZED;
212
213 if(0 == decoder->private_->read_callback || 0 == decoder->private_->seek_callback || 0 == decoder->private_->tell_callback || 0 == decoder->private_->length_callback || 0 == decoder->private_->eof_callback)
214 return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_INVALID_CALLBACK;
215
216 if(0 == decoder->private_->write_callback || 0 == decoder->private_->metadata_callback || 0 == decoder->private_->error_callback)
217 return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_INVALID_CALLBACK;
218
219 decoder->private_->seek_table = 0;
220
221 decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
222
223 /* We initialize the FLAC__MD5Context even though we may never use it. This
224 * is because md5 checking may be turned on to start and then turned off if
225 * a seek occurs. So we always init the context here and finalize it in
226 * FLAC__seekable_stream_decoder_finish() to make sure things are always
227 * cleaned up properly.
228 */
229 FLAC__MD5Init(&decoder->private_->md5context);
230
231 FLAC__stream_decoder_set_read_callback(decoder->private_->stream_decoder, read_callback_);
232 FLAC__stream_decoder_set_write_callback(decoder->private_->stream_decoder, write_callback_);
233 FLAC__stream_decoder_set_metadata_callback(decoder->private_->stream_decoder, metadata_callback_);
234 FLAC__stream_decoder_set_error_callback(decoder->private_->stream_decoder, error_callback_);
235 FLAC__stream_decoder_set_client_data(decoder->private_->stream_decoder, decoder);
236
237 /* We always want to see these blocks. Whether or not we pass them up
238 * through the metadata callback will be determined by flags set in our
239 * implementation of ..._set_metadata_respond/ignore...()
240 */
241 FLAC__stream_decoder_set_metadata_respond(decoder->private_->stream_decoder, FLAC__METADATA_TYPE_STREAMINFO);
242 FLAC__stream_decoder_set_metadata_respond(decoder->private_->stream_decoder, FLAC__METADATA_TYPE_SEEKTABLE);
243
244 if(FLAC__stream_decoder_init(decoder->private_->stream_decoder) != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA)
245 return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
246
247 return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_OK;
248}
249
250FLAC_API FLAC__bool FLAC__seekable_stream_decoder_finish(FLAC__SeekableStreamDecoder *decoder)
251{
252 FLAC__bool md5_failed = false;
253
254 FLAC__ASSERT(0 != decoder);
255 FLAC__ASSERT(0 != decoder->private_);
256 FLAC__ASSERT(0 != decoder->protected_);
257
258 if(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
259 return true;
260
261 FLAC__ASSERT(0 != decoder->private_->stream_decoder);
262
263 /* see the comment in FLAC__seekable_stream_decoder_init() as to why we
264 * always call FLAC__MD5Final()
265 */
266 FLAC__MD5Final(decoder->private_->computed_md5sum, &decoder->private_->md5context);
267
268 FLAC__stream_decoder_finish(decoder->private_->stream_decoder);
269
270 if(decoder->private_->do_md5_checking) {
271 if(memcmp(decoder->private_->stored_md5sum, decoder->private_->computed_md5sum, 16))
272 md5_failed = true;
273 }
274
275 set_defaults_(decoder);
276
277 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED;
278
279 return !md5_failed;
280}
281
282FLAC_API FLAC__bool FLAC__seekable_stream_decoder_set_md5_checking(FLAC__SeekableStreamDecoder *decoder, FLAC__bool value)
283{
284 FLAC__ASSERT(0 != decoder);
285 FLAC__ASSERT(0 != decoder->protected_);
286 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
287 return false;
288 decoder->protected_->md5_checking = value;
289 return true;
290}
291
292FLAC_API FLAC__bool FLAC__seekable_stream_decoder_set_read_callback(FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderReadCallback value)
293{
294 FLAC__ASSERT(0 != decoder);
295 FLAC__ASSERT(0 != decoder->private_);
296 FLAC__ASSERT(0 != decoder->protected_);
297 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
298 return false;
299 decoder->private_->read_callback = value;
300 return true;
301}
302
303FLAC_API FLAC__bool FLAC__seekable_stream_decoder_set_seek_callback(FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderSeekCallback value)
304{
305 FLAC__ASSERT(0 != decoder);
306 FLAC__ASSERT(0 != decoder->private_);
307 FLAC__ASSERT(0 != decoder->protected_);
308 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
309 return false;
310 decoder->private_->seek_callback = value;
311 return true;
312}
313
314FLAC_API FLAC__bool FLAC__seekable_stream_decoder_set_tell_callback(FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderTellCallback value)
315{
316 FLAC__ASSERT(0 != decoder);
317 FLAC__ASSERT(0 != decoder->private_);
318 FLAC__ASSERT(0 != decoder->protected_);
319 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
320 return false;
321 decoder->private_->tell_callback = value;
322 return true;
323}
324
325FLAC_API FLAC__bool FLAC__seekable_stream_decoder_set_length_callback(FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderLengthCallback value)
326{
327 FLAC__ASSERT(0 != decoder);
328 FLAC__ASSERT(0 != decoder->private_);
329 FLAC__ASSERT(0 != decoder->protected_);
330 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
331 return false;
332 decoder->private_->length_callback = value;
333 return true;
334}
335
336FLAC_API FLAC__bool FLAC__seekable_stream_decoder_set_eof_callback(FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderEofCallback value)
337{
338 FLAC__ASSERT(0 != decoder);
339 FLAC__ASSERT(0 != decoder->private_);
340 FLAC__ASSERT(0 != decoder->protected_);
341 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
342 return false;
343 decoder->private_->eof_callback = value;
344 return true;
345}
346
347FLAC_API FLAC__bool FLAC__seekable_stream_decoder_set_write_callback(FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderWriteCallback value)
348{
349 FLAC__ASSERT(0 != decoder);
350 FLAC__ASSERT(0 != decoder->private_);
351 FLAC__ASSERT(0 != decoder->protected_);
352 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
353 return false;
354 decoder->private_->write_callback = value;
355 return true;
356}
357
358FLAC_API FLAC__bool FLAC__seekable_stream_decoder_set_metadata_callback(FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderMetadataCallback value)
359{
360 FLAC__ASSERT(0 != decoder);
361 FLAC__ASSERT(0 != decoder->private_);
362 FLAC__ASSERT(0 != decoder->protected_);
363 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
364 return false;
365 decoder->private_->metadata_callback = value;
366 return true;
367}
368
369FLAC_API FLAC__bool FLAC__seekable_stream_decoder_set_error_callback(FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderErrorCallback value)
370{
371 FLAC__ASSERT(0 != decoder);
372 FLAC__ASSERT(0 != decoder->private_);
373 FLAC__ASSERT(0 != decoder->protected_);
374 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
375 return false;
376 decoder->private_->error_callback = value;
377 return true;
378}
379
380FLAC_API FLAC__bool FLAC__seekable_stream_decoder_set_client_data(FLAC__SeekableStreamDecoder *decoder, void *value)
381{
382 FLAC__ASSERT(0 != decoder);
383 FLAC__ASSERT(0 != decoder->private_);
384 FLAC__ASSERT(0 != decoder->protected_);
385 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
386 return false;
387 decoder->private_->client_data = value;
388 return true;
389}
390
391FLAC_API FLAC__bool FLAC__seekable_stream_decoder_set_metadata_respond(FLAC__SeekableStreamDecoder *decoder, FLAC__MetadataType type)
392{
393 FLAC__ASSERT(0 != decoder);
394 FLAC__ASSERT(0 != decoder->private_);
395 FLAC__ASSERT(0 != decoder->protected_);
396 FLAC__ASSERT(0 != decoder->private_->stream_decoder);
397 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
398 return false;
399 if(type == FLAC__METADATA_TYPE_STREAMINFO)
400 decoder->private_->ignore_stream_info_block = false;
401 else if(type == FLAC__METADATA_TYPE_SEEKTABLE)
402 decoder->private_->ignore_seek_table_block = false;
403 return FLAC__stream_decoder_set_metadata_respond(decoder->private_->stream_decoder, type);
404}
405
406FLAC_API FLAC__bool FLAC__seekable_stream_decoder_set_metadata_respond_application(FLAC__SeekableStreamDecoder *decoder, const FLAC__byte id[4])
407{
408 FLAC__ASSERT(0 != decoder);
409 FLAC__ASSERT(0 != decoder->private_);
410 FLAC__ASSERT(0 != decoder->protected_);
411 FLAC__ASSERT(0 != decoder->private_->stream_decoder);
412 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
413 return false;
414 return FLAC__stream_decoder_set_metadata_respond_application(decoder->private_->stream_decoder, id);
415}
416
417FLAC_API FLAC__bool FLAC__seekable_stream_decoder_set_metadata_respond_all(FLAC__SeekableStreamDecoder *decoder)
418{
419 FLAC__ASSERT(0 != decoder);
420 FLAC__ASSERT(0 != decoder->private_);
421 FLAC__ASSERT(0 != decoder->protected_);
422 FLAC__ASSERT(0 != decoder->private_->stream_decoder);
423 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
424 return false;
425 decoder->private_->ignore_stream_info_block = false;
426 decoder->private_->ignore_seek_table_block = false;
427 return FLAC__stream_decoder_set_metadata_respond_all(decoder->private_->stream_decoder);
428}
429
430FLAC_API FLAC__bool FLAC__seekable_stream_decoder_set_metadata_ignore(FLAC__SeekableStreamDecoder *decoder, FLAC__MetadataType type)
431{
432 FLAC__ASSERT(0 != decoder);
433 FLAC__ASSERT(0 != decoder->private_);
434 FLAC__ASSERT(0 != decoder->protected_);
435 FLAC__ASSERT(0 != decoder->private_->stream_decoder);
436 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
437 return false;
438 if(type == FLAC__METADATA_TYPE_STREAMINFO) {
439 decoder->private_->ignore_stream_info_block = true;
440 return true;
441 }
442 else if(type == FLAC__METADATA_TYPE_SEEKTABLE) {
443 decoder->private_->ignore_seek_table_block = true;
444 return true;
445 }
446 else
447 return FLAC__stream_decoder_set_metadata_ignore(decoder->private_->stream_decoder, type);
448}
449
450FLAC_API FLAC__bool FLAC__seekable_stream_decoder_set_metadata_ignore_application(FLAC__SeekableStreamDecoder *decoder, const FLAC__byte id[4])
451{
452 FLAC__ASSERT(0 != decoder);
453 FLAC__ASSERT(0 != decoder->private_);
454 FLAC__ASSERT(0 != decoder->protected_);
455 FLAC__ASSERT(0 != decoder->private_->stream_decoder);
456 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
457 return false;
458 return FLAC__stream_decoder_set_metadata_ignore_application(decoder->private_->stream_decoder, id);
459}
460
461FLAC_API FLAC__bool FLAC__seekable_stream_decoder_set_metadata_ignore_all(FLAC__SeekableStreamDecoder *decoder)
462{
463 FLAC__ASSERT(0 != decoder);
464 FLAC__ASSERT(0 != decoder->private_);
465 FLAC__ASSERT(0 != decoder->protected_);
466 FLAC__ASSERT(0 != decoder->private_->stream_decoder);
467 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
468 return false;
469 decoder->private_->ignore_stream_info_block = true;
470 decoder->private_->ignore_seek_table_block = true;
471 return
472 FLAC__stream_decoder_set_metadata_ignore_all(decoder->private_->stream_decoder) &&
473 FLAC__stream_decoder_set_metadata_respond(decoder->private_->stream_decoder, FLAC__METADATA_TYPE_STREAMINFO) &&
474 FLAC__stream_decoder_set_metadata_respond(decoder->private_->stream_decoder, FLAC__METADATA_TYPE_SEEKTABLE);
475}
476
477FLAC_API FLAC__SeekableStreamDecoderState FLAC__seekable_stream_decoder_get_state(const FLAC__SeekableStreamDecoder *decoder)
478{
479 FLAC__ASSERT(0 != decoder);
480 FLAC__ASSERT(0 != decoder->protected_);
481 return decoder->protected_->state;
482}
483
484FLAC_API FLAC__StreamDecoderState FLAC__seekable_stream_decoder_get_stream_decoder_state(const FLAC__SeekableStreamDecoder *decoder)
485{
486 FLAC__ASSERT(0 != decoder);
487 FLAC__ASSERT(0 != decoder->private_);
488 return FLAC__stream_decoder_get_state(decoder->private_->stream_decoder);
489}
490
491FLAC_API const char *FLAC__seekable_stream_decoder_get_resolved_state_string(const FLAC__SeekableStreamDecoder *decoder)
492{
493 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR)
494 return FLAC__SeekableStreamDecoderStateString[decoder->protected_->state];
495 else
496 return FLAC__stream_decoder_get_resolved_state_string(decoder->private_->stream_decoder);
497}
498
499FLAC_API FLAC__bool FLAC__seekable_stream_decoder_get_md5_checking(const FLAC__SeekableStreamDecoder *decoder)
500{
501 FLAC__ASSERT(0 != decoder);
502 FLAC__ASSERT(0 != decoder->protected_);
503 return decoder->protected_->md5_checking;
504}
505
506FLAC_API unsigned FLAC__seekable_stream_decoder_get_channels(const FLAC__SeekableStreamDecoder *decoder)
507{
508 FLAC__ASSERT(0 != decoder);
509 FLAC__ASSERT(0 != decoder->private_);
510 return FLAC__stream_decoder_get_channels(decoder->private_->stream_decoder);
511}
512
513FLAC_API FLAC__ChannelAssignment FLAC__seekable_stream_decoder_get_channel_assignment(const FLAC__SeekableStreamDecoder *decoder)
514{
515 FLAC__ASSERT(0 != decoder);
516 FLAC__ASSERT(0 != decoder->private_);
517 return FLAC__stream_decoder_get_channel_assignment(decoder->private_->stream_decoder);
518}
519
520FLAC_API unsigned FLAC__seekable_stream_decoder_get_bits_per_sample(const FLAC__SeekableStreamDecoder *decoder)
521{
522 FLAC__ASSERT(0 != decoder);
523 FLAC__ASSERT(0 != decoder->private_);
524 return FLAC__stream_decoder_get_bits_per_sample(decoder->private_->stream_decoder);
525}
526
527FLAC_API unsigned FLAC__seekable_stream_decoder_get_sample_rate(const FLAC__SeekableStreamDecoder *decoder)
528{
529 FLAC__ASSERT(0 != decoder);
530 FLAC__ASSERT(0 != decoder->private_);
531 return FLAC__stream_decoder_get_sample_rate(decoder->private_->stream_decoder);
532}
533
534FLAC_API unsigned FLAC__seekable_stream_decoder_get_blocksize(const FLAC__SeekableStreamDecoder *decoder)
535{
536 FLAC__ASSERT(0 != decoder);
537 FLAC__ASSERT(0 != decoder->private_);
538 return FLAC__stream_decoder_get_blocksize(decoder->private_->stream_decoder);
539}
540
541FLAC_API FLAC__bool FLAC__seekable_stream_decoder_get_decode_position(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *position)
542{
543 FLAC__ASSERT(0 != decoder);
544 FLAC__ASSERT(0 != decoder->private_);
545 FLAC__ASSERT(0 != position);
546
547 if(decoder->private_->tell_callback(decoder, position, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK)
548 return false;
549 FLAC__ASSERT(*position >= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder->private_->stream_decoder));
550 *position -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder->private_->stream_decoder);
551 return true;
552}
553
554FLAC_API FLAC__bool FLAC__seekable_stream_decoder_flush(FLAC__SeekableStreamDecoder *decoder)
555{
556 FLAC__ASSERT(0 != decoder);
557 FLAC__ASSERT(0 != decoder->private_);
558 FLAC__ASSERT(0 != decoder->protected_);
559
560 decoder->private_->do_md5_checking = false;
561
562 if(!FLAC__stream_decoder_flush(decoder->private_->stream_decoder)) {
563 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
564 return false;
565 }
566
567 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_OK;
568
569 return true;
570}
571
572FLAC_API FLAC__bool FLAC__seekable_stream_decoder_reset(FLAC__SeekableStreamDecoder *decoder)
573{
574 FLAC__ASSERT(0 != decoder);
575 FLAC__ASSERT(0 != decoder->private_);
576 FLAC__ASSERT(0 != decoder->protected_);
577
578 if(!FLAC__seekable_stream_decoder_flush(decoder)) {
579 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
580 return false;
581 }
582
583 if(!FLAC__stream_decoder_reset(decoder->private_->stream_decoder)) {
584 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
585 return false;
586 }
587
588 decoder->private_->seek_table = 0;
589
590 decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
591
592 /* We initialize the FLAC__MD5Context even though we may never use it. This
593 * is because md5 checking may be turned on to start and then turned off if
594 * a seek occurs. So we always init the context here and finalize it in
595 * FLAC__seekable_stream_decoder_finish() to make sure things are always
596 * cleaned up properly.
597 */
598 FLAC__MD5Init(&decoder->private_->md5context);
599
600 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_OK;
601
602 return true;
603}
604
605FLAC_API FLAC__bool FLAC__seekable_stream_decoder_process_single(FLAC__SeekableStreamDecoder *decoder)
606{
607 FLAC__bool ret;
608 FLAC__ASSERT(0 != decoder);
609
610 if(decoder->private_->stream_decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
611 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM;
612
613 if(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM)
614 return true;
615
616 FLAC__ASSERT(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_OK);
617
618 ret = FLAC__stream_decoder_process_single(decoder->private_->stream_decoder);
619 if(!ret)
620 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
621
622 return ret;
623}
624
625FLAC_API FLAC__bool FLAC__seekable_stream_decoder_process_until_end_of_metadata(FLAC__SeekableStreamDecoder *decoder)
626{
627 FLAC__bool ret;
628 FLAC__ASSERT(0 != decoder);
629
630 if(decoder->private_->stream_decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
631 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM;
632
633 if(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM)
634 return true;
635
636 FLAC__ASSERT(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_OK);
637
638 ret = FLAC__stream_decoder_process_until_end_of_metadata(decoder->private_->stream_decoder);
639 if(!ret)
640 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
641
642 return ret;
643}
644
645FLAC_API FLAC__bool FLAC__seekable_stream_decoder_process_until_end_of_stream(FLAC__SeekableStreamDecoder *decoder)
646{
647 FLAC__bool ret;
648 FLAC__ASSERT(0 != decoder);
649
650 if(decoder->private_->stream_decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
651 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM;
652
653 if(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM)
654 return true;
655
656 FLAC__ASSERT(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_OK);
657
658 ret = FLAC__stream_decoder_process_until_end_of_stream(decoder->private_->stream_decoder);
659 if(!ret)
660 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
661
662 return ret;
663}
664
665FLAC_API FLAC__bool FLAC__seekable_stream_decoder_skip_single_frame(FLAC__SeekableStreamDecoder *decoder)
666{
667 FLAC__bool ret;
668 FLAC__ASSERT(0 != decoder);
669
670 if(decoder->private_->stream_decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
671 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM;
672
673 if(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM)
674 return true;
675
676 FLAC__ASSERT(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_OK);
677
678 ret = FLAC__stream_decoder_skip_single_frame(decoder->private_->stream_decoder);
679 if(!ret)
680 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
681
682 return ret;
683}
684
685FLAC_API FLAC__bool FLAC__seekable_stream_decoder_seek_absolute(FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 sample)
686{
687 FLAC__uint64 length;
688
689 FLAC__ASSERT(0 != decoder);
690 FLAC__ASSERT(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_OK || decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM);
691
692 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEKING;
693
694 /* turn off md5 checking if a seek is attempted */
695 decoder->private_->do_md5_checking = false;
696
697 if(!FLAC__stream_decoder_reset(decoder->private_->stream_decoder)) {
698 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
699 return false;
700 }
701 /* get the file length */
702 if(decoder->private_->length_callback(decoder, &length, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK) {
703 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR;
704 return false;
705 }
706 /* rewind */
707 if(decoder->private_->seek_callback(decoder, 0, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK) {
708 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR;
709 return false;
710 }
711 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder->private_->stream_decoder)) {
712 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
713 return false;
714 }
715 if(decoder->private_->stream_info.total_samples > 0 && sample >= decoder->private_->stream_info.total_samples) {
716 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR;
717 return false;
718 }
719
720 return seek_to_absolute_sample_(decoder, length, sample);
721}
722
723/***********************************************************************
724 *
725 * Private class methods
726 *
727 ***********************************************************************/
728
729void set_defaults_(FLAC__SeekableStreamDecoder *decoder)
730{
731 decoder->private_->read_callback = 0;
732 decoder->private_->seek_callback = 0;
733 decoder->private_->tell_callback = 0;
734 decoder->private_->length_callback = 0;
735 decoder->private_->eof_callback = 0;
736 decoder->private_->write_callback = 0;
737 decoder->private_->metadata_callback = 0;
738 decoder->private_->error_callback = 0;
739 decoder->private_->client_data = 0;
740 /* WATCHOUT: these should match the default behavior of FLAC__StreamDecoder */
741 decoder->private_->ignore_stream_info_block = false;
742 decoder->private_->ignore_seek_table_block = true;
743
744 decoder->protected_->md5_checking = false;
745}
746
747FLAC__StreamDecoderReadStatus read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data)
748{
749 FLAC__SeekableStreamDecoder *seekable_stream_decoder = (FLAC__SeekableStreamDecoder *)client_data;
750 (void)decoder;
751 if(seekable_stream_decoder->private_->eof_callback(seekable_stream_decoder, seekable_stream_decoder->private_->client_data)) {
752 *bytes = 0;
753#if 0
754 /*@@@@@@ verify that this is not needed */
755 seekable_stream_decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM;
756#endif
757 return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
758 }
759 else if(*bytes > 0) {
760 if(seekable_stream_decoder->private_->read_callback(seekable_stream_decoder, buffer, bytes, seekable_stream_decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_OK) {
761 seekable_stream_decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_READ_ERROR;
762 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
763 }
764 if(*bytes == 0) {
765 if(seekable_stream_decoder->private_->eof_callback(seekable_stream_decoder, seekable_stream_decoder->private_->client_data)) {
766#if 0
767 /*@@@@@@ verify that this is not needed */
768 seekable_stream_decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM;
769#endif
770 return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
771 }
772 else
773 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
774 }
775 else {
776 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
777 }
778 }
779 else
780 return FLAC__STREAM_DECODER_READ_STATUS_ABORT; /* abort to avoid a deadlock */
781}
782
783FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
784{
785 FLAC__SeekableStreamDecoder *seekable_stream_decoder = (FLAC__SeekableStreamDecoder *)client_data;
786 (void)decoder;
787
788 if(seekable_stream_decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_SEEKING) {
789 FLAC__uint64 this_frame_sample = frame->header.number.sample_number;
790 FLAC__uint64 next_frame_sample = this_frame_sample + (FLAC__uint64)frame->header.blocksize;
791 FLAC__uint64 target_sample = seekable_stream_decoder->private_->target_sample;
792
793 FLAC__ASSERT(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
794
795 seekable_stream_decoder->private_->last_frame = *frame; /* save the frame */
796 if(this_frame_sample <= target_sample && target_sample < next_frame_sample) { /* we hit our target frame */
797 unsigned delta = (unsigned)(target_sample - this_frame_sample);
798 /* kick out of seek mode */
799 seekable_stream_decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_OK;
800 /* shift out the samples before target_sample */
801 if(delta > 0) {
802 unsigned channel;
803 const FLAC__int32 *newbuffer[FLAC__MAX_CHANNELS];
804 for(channel = 0; channel < frame->header.channels; channel++)
805 newbuffer[channel] = buffer[channel] + delta;
806 seekable_stream_decoder->private_->last_frame.header.blocksize -= delta;
807 seekable_stream_decoder->private_->last_frame.header.number.sample_number += (FLAC__uint64)delta;
808 /* write the relevant samples */
809 return seekable_stream_decoder->private_->write_callback(seekable_stream_decoder, &seekable_stream_decoder->private_->last_frame, newbuffer, seekable_stream_decoder->private_->client_data);
810 }
811 else {
812 /* write the relevant samples */
813 return seekable_stream_decoder->private_->write_callback(seekable_stream_decoder, frame, buffer, seekable_stream_decoder->private_->client_data);
814 }
815 }
816 else {
817 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
818 }
819 }
820 else {
821 if(seekable_stream_decoder->private_->do_md5_checking) {
822 if(!FLAC__MD5Accumulate(&seekable_stream_decoder->private_->md5context, buffer, frame->header.channels, frame->header.blocksize, (frame->header.bits_per_sample+7) / 8))
823 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
824 }
825 return seekable_stream_decoder->private_->write_callback(seekable_stream_decoder, frame, buffer, seekable_stream_decoder->private_->client_data);
826 }
827}
828
829void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
830{
831 FLAC__SeekableStreamDecoder *seekable_stream_decoder = (FLAC__SeekableStreamDecoder *)client_data;
832 (void)decoder;
833
834 if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) {
835 seekable_stream_decoder->private_->stream_info = metadata->data.stream_info;
836 /* save the MD5 signature for comparison later */
837 memcpy(seekable_stream_decoder->private_->stored_md5sum, metadata->data.stream_info.md5sum, 16);
838 if(0 == memcmp(seekable_stream_decoder->private_->stored_md5sum, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 16))
839 seekable_stream_decoder->private_->do_md5_checking = false;
840 }
841 else if(metadata->type == FLAC__METADATA_TYPE_SEEKTABLE) {
842 seekable_stream_decoder->private_->seek_table = &metadata->data.seek_table;
843 }
844
845 if(seekable_stream_decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING) {
846 FLAC__bool ignore_block = false;
847 if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO && seekable_stream_decoder->private_->ignore_stream_info_block)
848 ignore_block = true;
849 else if(metadata->type == FLAC__METADATA_TYPE_SEEKTABLE && seekable_stream_decoder->private_->ignore_seek_table_block)
850 ignore_block = true;
851 if(!ignore_block)
852 seekable_stream_decoder->private_->metadata_callback(seekable_stream_decoder, metadata, seekable_stream_decoder->private_->client_data);
853 }
854}
855
856void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
857{
858 FLAC__SeekableStreamDecoder *seekable_stream_decoder = (FLAC__SeekableStreamDecoder *)client_data;
859 (void)decoder;
860
861 if(seekable_stream_decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING)
862 seekable_stream_decoder->private_->error_callback(seekable_stream_decoder, status, seekable_stream_decoder->private_->client_data);
863}
864
865FLAC__bool seek_to_absolute_sample_(FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample)
866{
867 FLAC__uint64 first_frame_offset, lower_bound, upper_bound;
868 FLAC__int64 pos = -1, last_pos = -1;
869 int i, lower_seek_point = -1, upper_seek_point = -1;
870 unsigned approx_bytes_per_frame;
871 FLAC__uint64 last_frame_sample = FLAC__U64L(0xffffffffffffffff);
872 FLAC__bool needs_seek;
873 const FLAC__uint64 total_samples = decoder->private_->stream_info.total_samples;
874 const unsigned min_blocksize = decoder->private_->stream_info.min_blocksize;
875 const unsigned max_blocksize = decoder->private_->stream_info.max_blocksize;
876 const unsigned max_framesize = decoder->private_->stream_info.max_framesize;
877 const unsigned channels = FLAC__seekable_stream_decoder_get_channels(decoder);
878 const unsigned bps = FLAC__seekable_stream_decoder_get_bits_per_sample(decoder);
879
880 /* we are just guessing here, but we want to guess high, not low */
881 if(max_framesize > 0) {
882 approx_bytes_per_frame = max_framesize;
883 }
884 /*
885 * Check if it's a known fixed-blocksize stream. Note that though
886 * the spec doesn't allow zeroes in the STREAMINFO block, we may
887 * never get a STREAMINFO block when decoding so the value of
888 * min_blocksize might be zero.
889 */
890 else if(min_blocksize == max_blocksize && min_blocksize > 0) {
891 /* note there are no () around 'bps/8' to keep precision up since it's an integer calulation */
892 approx_bytes_per_frame = min_blocksize * channels * bps/8 + 64;
893 }
894 else
895 approx_bytes_per_frame = 4608 * channels * bps/8 + 64;
896
897 /*
898 * The decode position is currently at the first frame since we
899 * rewound and processed metadata.
900 */
901 if(!FLAC__seekable_stream_decoder_get_decode_position(decoder, &first_frame_offset)) {
902 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR;
903 return false;
904 }
905
906 /*
907 * First, we set an upper and lower bound on where in the
908 * stream we will search. For now we assume the worst case
909 * scenario, which is our best guess at the beginning of
910 * the first and last frames.
911 */
912 lower_bound = first_frame_offset;
913
914 /* calc the upper_bound, beyond which we never want to seek */
915 if(max_framesize > 0)
916 upper_bound = stream_length - (max_framesize + 128 + 2); /* 128 for a possible ID3V1 tag, 2 for indexing differences */
917 else
918 upper_bound = stream_length - ((channels * bps * FLAC__MAX_BLOCK_SIZE) / 8 + 128 + 2);
919
920 /*
921 * Now we refine the bounds if we have a seektable with
922 * suitable points. Note that according to the spec they
923 * must be ordered by ascending sample number.
924 */
925 if(0 != decoder->private_->seek_table) {
926 /* find the closest seek point <= target_sample, if it exists */
927 for(i = (int)decoder->private_->seek_table->num_points - 1; i >= 0; i--) {
928 if(decoder->private_->seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER && decoder->private_->seek_table->points[i].sample_number <= target_sample)
929 break;
930 }
931 if(i >= 0) { /* i.e. we found a suitable seek point... */
932 lower_bound = first_frame_offset + decoder->private_->seek_table->points[i].stream_offset;
933 lower_seek_point = i;
934 }
935
936 /* find the closest seek point > target_sample, if it exists */
937 for(i = 0; i < (int)decoder->private_->seek_table->num_points; i++) {
938 if(decoder->private_->seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER && decoder->private_->seek_table->points[i].sample_number > target_sample)
939 break;
940 }
941 if(i < (int)decoder->private_->seek_table->num_points) { /* i.e. we found a suitable seek point... */
942 upper_bound = first_frame_offset + decoder->private_->seek_table->points[i].stream_offset;
943 upper_seek_point = i;
944 }
945 }
946
947 /*
948 * Now guess at where within those bounds our target
949 * sample will be.
950 */
951 if(lower_seek_point >= 0) {
952 /* first see if our sample is within a few frames of the lower seekpoint */
953 if(decoder->private_->seek_table->points[lower_seek_point].sample_number <= target_sample && target_sample < decoder->private_->seek_table->points[lower_seek_point].sample_number + (decoder->private_->seek_table->points[lower_seek_point].frame_samples * 4)) {
954 pos = (FLAC__int64)lower_bound;
955 }
956 else if(upper_seek_point >= 0) {
957 const FLAC__uint64 target_offset = target_sample - decoder->private_->seek_table->points[lower_seek_point].sample_number;
958 const FLAC__uint64 range_samples = decoder->private_->seek_table->points[upper_seek_point].sample_number - decoder->private_->seek_table->points[lower_seek_point].sample_number;
959 const FLAC__uint64 range_bytes = (upper_bound>lower_bound? upper_bound - lower_bound - 1 : 0);
960#ifndef FLAC__INTEGER_ONLY_LIBRARY
961#if defined _MSC_VER || defined __MINGW32__
962 /* with MSVC you have to spoon feed it the casting */
963 pos = (FLAC__int64)lower_bound + (FLAC__int64)(((FLAC__double)(FLAC__int64)target_offset / (FLAC__double)(FLAC__int64)range_samples) * (FLAC__double)(FLAC__int64)(range_bytes-1)) - approx_bytes_per_frame;
964#else
965 pos = (FLAC__int64)lower_bound + (FLAC__int64)(((FLAC__double)target_offset / (FLAC__double)range_samples) * (FLAC__double)range_bytes) - approx_bytes_per_frame;
966#endif
967#else
968 /* a little less accurate: */
969 if (range_bytes <= 0xffffffff)
970 pos = (FLAC__int64)lower_bound + (FLAC__int64)((target_offset * range_bytes) / range_samples) - approx_bytes_per_frame;
971 else /* @@@ WATCHOUT, ~2TB limit */
972 pos = (FLAC__int64)lower_bound + (FLAC__int64)(((target_offset>>8) * (range_bytes>>8)) / (range_samples>>16)) - approx_bytes_per_frame;
973#endif
974 }
975 }
976
977 /*
978 * If there's no seek table, we need to use the metadata (if we
979 * have it) and the filelength to estimate the position of the
980 * frame with the correct sample.
981 */
982 if(pos < 0 && total_samples > 0) {
983 /*
984 * For max accuracy we should be using
985 * (stream_length-first_frame_offset-1) in the divisor, but the
986 * difference is trivial and (stream_length-first_frame_offset)
987 * has no chance of underflow.
988 */
989#ifndef FLAC__INTEGER_ONLY_LIBRARY
990#if defined _MSC_VER || defined __MINGW32__
991 /* with VC++ you have to spoon feed it the casting */
992 pos = (FLAC__int64)first_frame_offset + (FLAC__int64)(((FLAC__double)(FLAC__int64)target_sample / (FLAC__double)(FLAC__int64)total_samples) * (FLAC__double)(FLAC__int64)(stream_length-first_frame_offset)) - approx_bytes_per_frame;
993#else
994 pos = (FLAC__int64)first_frame_offset + (FLAC__int64)(((FLAC__double)target_sample / (FLAC__double)total_samples) * (FLAC__double)(stream_length-first_frame_offset)) - approx_bytes_per_frame;
995#endif
996#else
997 /* a little less accurate: */
998 if (stream_length < 0xffffffff)
999 pos = (FLAC__int64)first_frame_offset + (FLAC__int64)((target_sample * (stream_length-first_frame_offset)) / total_samples) - approx_bytes_per_frame;
1000 else /* @@@ WATCHOUT, ~2TB limit */
1001 pos = (FLAC__int64)first_frame_offset + (FLAC__int64)(((target_sample>>8) * ((stream_length-first_frame_offset)>>8)) / (total_samples>>16)) - approx_bytes_per_frame;
1002#endif
1003 }
1004
1005 /*
1006 * If there's no seek table and total_samples is unknown, we
1007 * don't even bother trying to figure out a target, we just use
1008 * our current position.
1009 */
1010 if(pos < 0) {
1011 FLAC__uint64 upos;
1012 if(decoder->private_->tell_callback(decoder, &upos, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK) {
1013 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR;
1014 return false;
1015 }
1016 pos = (FLAC__int64)upos;
1017 needs_seek = false;
1018 }
1019 else
1020 needs_seek = true;
1021
1022 /* clip the position to the bounds, lower bound takes precedence */
1023 if(pos >= (FLAC__int64)upper_bound) {
1024 pos = (FLAC__int64)upper_bound-1;
1025 needs_seek = true;
1026 }
1027 if(pos < (FLAC__int64)lower_bound) {
1028 pos = (FLAC__int64)lower_bound;
1029 needs_seek = true;
1030 }
1031
1032 decoder->private_->target_sample = target_sample;
1033 while(1) {
1034 if(needs_seek) {
1035 if(decoder->private_->seek_callback(decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK) {
1036 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR;
1037 return false;
1038 }
1039 if(!FLAC__stream_decoder_flush(decoder->private_->stream_decoder)) {
1040 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
1041 return false;
1042 }
1043 }
1044 /* Now we need to get a frame. It is possible for our seek
1045 * to land in the middle of audio data that looks exactly like
1046 * a frame header from a future version of an encoder. When
1047 * that happens, FLAC__stream_decoder_process_single() will
1048 * return false and the state will be
1049 * FLAC__STREAM_DECODER_UNPARSEABLE_STREAM. But there is a
1050 * remote possibility that it is properly synced at such a
1051 * "future-codec frame", so to make sure, we wait to see
1052 * several "unparseable" errors in a row before bailing out.
1053 */
1054 {
1055 unsigned unparseable_count;
1056 FLAC__bool got_a_frame = false;
1057 for (unparseable_count = 0; !got_a_frame && unparseable_count < 10; unparseable_count++) {
1058 if(FLAC__stream_decoder_process_single(decoder->private_->stream_decoder))
1059 got_a_frame = true;
1060 else if(decoder->private_->stream_decoder->protected_->state == FLAC__STREAM_DECODER_UNPARSEABLE_STREAM)
1061 /* try again. we don't want to flush the decoder since that clears the bitbuffer */
1062 decoder->private_->stream_decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1063 else /* it's a real error */
1064 break;
1065 }
1066 if (!got_a_frame) {
1067 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR;
1068 return false;
1069 }
1070 }
1071 /* our write callback will change the state when it gets to the target frame */
1072 /* actually, we could have got_a_frame if our decoder is at FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM so we need to check for that also */
1073 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING && decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) {
1074 break;
1075 }
1076 else { /* we need to narrow the search */
1077 const FLAC__uint64 this_frame_sample = decoder->private_->last_frame.header.number.sample_number;
1078 FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
1079 if(this_frame_sample == last_frame_sample && pos < last_pos) {
1080 /* our last move backwards wasn't big enough, double it */
1081 pos -= (last_pos - pos);
1082 needs_seek = true;
1083 }
1084 else {
1085 if(target_sample < this_frame_sample) {
1086 last_pos = pos;
1087 approx_bytes_per_frame = decoder->private_->last_frame.header.blocksize * channels * bps/8 + 64;
1088 pos -= approx_bytes_per_frame;
1089 needs_seek = true;
1090 }
1091 else { /* target_sample >= this_frame_sample + this frame's blocksize */
1092 FLAC__uint64 upos;
1093 if(decoder->private_->tell_callback(decoder, &upos, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK) {
1094 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR;
1095 return false;
1096 }
1097 last_pos = pos;
1098 pos = (FLAC__int64)upos;
1099 pos -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder->private_->stream_decoder);
1100 needs_seek = false;
1101 /*
1102 * if we haven't hit the target frame yet and our position hasn't changed,
1103 * it means we're at the end of the stream and the seek target does not exist.
1104 */
1105 if(last_pos == pos) {
1106 decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR;
1107 return false;
1108 }
1109 }
1110 }
1111 if(pos < (FLAC__int64)lower_bound)
1112 pos = (FLAC__int64)lower_bound;
1113 last_frame_sample = this_frame_sample;
1114 }
1115 }
1116
1117 return true;
1118}
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-19 23:26:57 +0000