1 /*
2 * Ogg bitstream support
3 * Luca Barbato <lu_zero@gentoo.org>
4 * Based on tcvp implementation
5 */
6
7 /*
8 Copyright (C) 2005 Michael Ahlberg, Måns Rullgård
9
10 Permission is hereby granted, free of charge, to any person
11 obtaining a copy of this software and associated documentation
12 files (the "Software"), to deal in the Software without
13 restriction, including without limitation the rights to use, copy,
14 modify, merge, publish, distribute, sublicense, and/or sell copies
15 of the Software, and to permit persons to whom the Software is
16 furnished to do so, subject to the following conditions:
17
18 The above copyright notice and this permission notice shall be
19 included in all copies or substantial portions of the Software.
20
21 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
25 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
26 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
27 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
28 DEALINGS IN THE SOFTWARE.
29 */
30
31 #include <stdio.h>
32 #include "libavutil/avassert.h"
33 #include "libavutil/intreadwrite.h"
34 #include "avio_internal.h"
35 #include "oggdec.h"
36 #include "avformat.h"
37 #include "internal.h"
38 #include "vorbiscomment.h"
39
40 #define MAX_PAGE_SIZE 65307
41 #define DECODER_BUFFER_SIZE MAX_PAGE_SIZE
42
43 static const struct ogg_codec * const ogg_codecs[] = {
44 &ff_skeleton_codec,
45 #if 0 // These codecs are not supported by Chromium.
46 &ff_dirac_codec,
47 &ff_speex_codec,
48 #endif
49 &ff_vorbis_codec,
50 &ff_theora_codec,
51 &ff_flac_codec,
52 #if 0 // These codecs are not supported by Chromium.
53 &ff_celt_codec,
54 #endif
55 &ff_opus_codec,
56 &ff_vp8_codec,
57 #if 0 // These codecs are not supported by Chromium.
58 &ff_old_dirac_codec,
59 #endif
60 &ff_old_flac_codec,
61 &ff_ogm_video_codec,
62 &ff_ogm_audio_codec,
63 &ff_ogm_text_codec,
64 &ff_ogm_old_codec,
65 NULL
66 };
67
68 static int64_t ogg_calc_pts(AVFormatContext *s, int idx, int64_t *dts);
69 static int ogg_new_stream(AVFormatContext *s, uint32_t serial);
70 static int ogg_restore(AVFormatContext *s);
71
free_stream(AVFormatContext * s,int i)72 static void free_stream(AVFormatContext *s, int i)
73 {
74 struct ogg *ogg = s->priv_data;
75 struct ogg_stream *stream = &ogg->streams[i];
76
77 av_freep(&stream->buf);
78 if (stream->codec &&
79 stream->codec->cleanup) {
80 stream->codec->cleanup(s, i);
81 }
82
83 av_freep(&stream->private);
84 av_freep(&stream->new_metadata);
85 }
86
87 //FIXME We could avoid some structure duplication
ogg_save(AVFormatContext * s)88 static int ogg_save(AVFormatContext *s)
89 {
90 struct ogg *ogg = s->priv_data;
91 struct ogg_state *ost =
92 av_malloc(sizeof(*ost) + (ogg->nstreams - 1) * sizeof(*ogg->streams));
93 int i;
94 int ret = 0;
95
96 if (!ost)
97 return AVERROR(ENOMEM);
98
99 ost->pos = avio_tell(s->pb);
100 ost->curidx = ogg->curidx;
101 ost->next = ogg->state;
102 ost->nstreams = ogg->nstreams;
103 memcpy(ost->streams, ogg->streams, ogg->nstreams * sizeof(*ogg->streams));
104
105 for (i = 0; i < ogg->nstreams; i++) {
106 struct ogg_stream *os = ogg->streams + i;
107 // Chromium: always allocate |buf| using av_realloc().
108 // av_mallocz() will use posix_memalign(), preventing reallocation.
109 #if 0
110 os->buf = av_mallocz(os->bufsize + AV_INPUT_BUFFER_PADDING_SIZE);
111 #else
112 os->buf = av_realloc(NULL, os->bufsize + AV_INPUT_BUFFER_PADDING_SIZE);
113 #endif
114 if (os->buf)
115 memcpy(os->buf, ost->streams[i].buf, os->bufpos);
116 else
117 ret = AVERROR(ENOMEM);
118 os->new_metadata = NULL;
119 os->new_metadata_size = 0;
120 }
121
122 ogg->state = ost;
123
124 if (ret < 0)
125 ogg_restore(s);
126
127 return ret;
128 }
129
ogg_restore(AVFormatContext * s)130 static int ogg_restore(AVFormatContext *s)
131 {
132 struct ogg *ogg = s->priv_data;
133 AVIOContext *bc = s->pb;
134 struct ogg_state *ost = ogg->state;
135 int i, err;
136
137 if (!ost)
138 return 0;
139
140 ogg->state = ost->next;
141
142 for (i = 0; i < ogg->nstreams; i++) {
143 struct ogg_stream *stream = &ogg->streams[i];
144 av_freep(&stream->buf);
145 av_freep(&stream->new_metadata);
146
147 if (i >= ost->nstreams || !ost->streams[i].private) {
148 free_stream(s, i);
149 }
150 }
151
152 avio_seek(bc, ost->pos, SEEK_SET);
153 ogg->page_pos = -1;
154 ogg->curidx = ost->curidx;
155 ogg->nstreams = ost->nstreams;
156 if ((err = av_reallocp_array(&ogg->streams, ogg->nstreams,
157 sizeof(*ogg->streams))) < 0) {
158 ogg->nstreams = 0;
159 return err;
160 } else
161 memcpy(ogg->streams, ost->streams,
162 ost->nstreams * sizeof(*ogg->streams));
163
164 av_free(ost);
165
166 return 0;
167 }
168
ogg_reset(AVFormatContext * s)169 static int ogg_reset(AVFormatContext *s)
170 {
171 struct ogg *ogg = s->priv_data;
172 int i;
173 int64_t start_pos = avio_tell(s->pb);
174
175 for (i = 0; i < ogg->nstreams; i++) {
176 struct ogg_stream *os = ogg->streams + i;
177 os->bufpos = 0;
178 os->pstart = 0;
179 os->psize = 0;
180 os->granule = -1;
181 os->lastpts = AV_NOPTS_VALUE;
182 os->lastdts = AV_NOPTS_VALUE;
183 os->sync_pos = -1;
184 os->page_pos = 0;
185 os->nsegs = 0;
186 os->segp = 0;
187 os->incomplete = 0;
188 os->got_data = 0;
189 if (start_pos <= s->internal->data_offset) {
190 os->lastpts = 0;
191 }
192 os->start_trimming = 0;
193 os->end_trimming = 0;
194 av_freep(&os->new_metadata);
195 os->new_metadata_size = 0;
196 }
197
198 ogg->page_pos = -1;
199 ogg->curidx = -1;
200
201 return 0;
202 }
203
ogg_find_codec(uint8_t * buf,int size)204 static const struct ogg_codec *ogg_find_codec(uint8_t *buf, int size)
205 {
206 int i;
207
208 for (i = 0; ogg_codecs[i]; i++)
209 if (size >= ogg_codecs[i]->magicsize &&
210 !memcmp(buf, ogg_codecs[i]->magic, ogg_codecs[i]->magicsize))
211 return ogg_codecs[i];
212
213 return NULL;
214 }
215
216 /**
217 * Replace the current stream with a new one. This is a typical webradio
218 * situation where a new audio stream spawn (identified with a new serial) and
219 * must replace the previous one (track switch).
220 */
ogg_replace_stream(AVFormatContext * s,uint32_t serial,char * magic,int page_size,int probing)221 static int ogg_replace_stream(AVFormatContext *s, uint32_t serial, char *magic, int page_size,
222 int probing)
223 {
224 struct ogg *ogg = s->priv_data;
225 struct ogg_stream *os;
226 const struct ogg_codec *codec;
227 int i = 0;
228
229 if (ogg->nstreams != 1) {
230 avpriv_report_missing_feature(s, "Changing stream parameters in multistream ogg");
231 return AVERROR_PATCHWELCOME;
232 }
233
234 /* Check for codecs */
235 codec = ogg_find_codec(magic, page_size);
236 if (!codec && !probing) {
237 av_log(s, AV_LOG_ERROR, "Cannot identify new stream\n");
238 return AVERROR_INVALIDDATA;
239 }
240
241 os = &ogg->streams[0];
242 if (os->codec != codec)
243 return AVERROR(EINVAL);
244
245 os->serial = serial;
246 os->codec = codec;
247 os->serial = serial;
248 os->lastpts = 0;
249 os->lastdts = 0;
250 os->start_trimming = 0;
251 os->end_trimming = 0;
252
253 /* Chained files have extradata as a new packet */
254 if (codec == &ff_opus_codec)
255 os->header = -1;
256
257 return i;
258 }
259
ogg_new_stream(AVFormatContext * s,uint32_t serial)260 static int ogg_new_stream(AVFormatContext *s, uint32_t serial)
261 {
262 struct ogg *ogg = s->priv_data;
263 int idx = ogg->nstreams;
264 AVStream *st;
265 struct ogg_stream *os;
266 size_t size;
267
268 if (ogg->state) {
269 av_log(s, AV_LOG_ERROR, "New streams are not supposed to be added "
270 "in between Ogg context save/restore operations.\n");
271 return AVERROR_BUG;
272 }
273
274 /* Allocate and init a new Ogg Stream */
275 if (av_size_mult(ogg->nstreams + 1, sizeof(*ogg->streams), &size) < 0 ||
276 !(os = av_realloc(ogg->streams, size)))
277 return AVERROR(ENOMEM);
278 ogg->streams = os;
279 os = ogg->streams + idx;
280 memset(os, 0, sizeof(*os));
281 os->serial = serial;
282 os->bufsize = DECODER_BUFFER_SIZE;
283 // Chromium: always allocate |buf| using av_realloc().
284 // av_malloc() will use posix_memalign(), preventing reallocation.
285 #if 0
286 os->buf = av_malloc(os->bufsize + AV_INPUT_BUFFER_PADDING_SIZE);
287 #else
288 os->buf = av_realloc(NULL, os->bufsize + AV_INPUT_BUFFER_PADDING_SIZE);
289 #endif
290 os->header = -1;
291 os->start_granule = OGG_NOGRANULE_VALUE;
292 if (!os->buf)
293 return AVERROR(ENOMEM);
294
295 /* Create the associated AVStream */
296 st = avformat_new_stream(s, NULL);
297 if (!st) {
298 av_freep(&os->buf);
299 return AVERROR(ENOMEM);
300 }
301 st->id = idx;
302 avpriv_set_pts_info(st, 64, 1, 1000000);
303
304 ogg->nstreams++;
305 return idx;
306 }
307
data_packets_seen(const struct ogg * ogg)308 static int data_packets_seen(const struct ogg *ogg)
309 {
310 int i;
311
312 for (i = 0; i < ogg->nstreams; i++)
313 if (ogg->streams[i].got_data)
314 return 1;
315 return 0;
316 }
317
buf_realloc(struct ogg_stream * os,int size)318 static int buf_realloc(struct ogg_stream *os, int size)
319 {
320 /* Even if invalid guarantee there's enough memory to read the page */
321 if (os->bufsize - os->bufpos < size) {
322 uint8_t *nb = av_realloc(os->buf, 2*os->bufsize + AV_INPUT_BUFFER_PADDING_SIZE);
323 if (!nb)
324 return AVERROR(ENOMEM);
325 os->buf = nb;
326 os->bufsize *= 2;
327 }
328
329 return 0;
330 }
331
ogg_read_page(AVFormatContext * s,int * sid,int probing)332 static int ogg_read_page(AVFormatContext *s, int *sid, int probing)
333 {
334 AVIOContext *bc = s->pb;
335 struct ogg *ogg = s->priv_data;
336 struct ogg_stream *os;
337 int ret, i = 0;
338 int flags, nsegs;
339 uint64_t gp;
340 uint32_t serial;
341 uint32_t crc, crc_tmp;
342 int size = 0, idx;
343 int64_t version, page_pos;
344 int64_t start_pos;
345 uint8_t sync[4];
346 uint8_t segments[255];
347 uint8_t *readout_buf;
348 int sp = 0;
349
350 ret = avio_read(bc, sync, 4);
351 if (ret < 4)
352 return ret < 0 ? ret : AVERROR_EOF;
353
354 do {
355 int c;
356
357 if (sync[sp & 3] == 'O' &&
358 sync[(sp + 1) & 3] == 'g' &&
359 sync[(sp + 2) & 3] == 'g' && sync[(sp + 3) & 3] == 'S')
360 break;
361
362 if(!i && (bc->seekable & AVIO_SEEKABLE_NORMAL) && ogg->page_pos > 0) {
363 memset(sync, 0, 4);
364 avio_seek(bc, ogg->page_pos+4, SEEK_SET);
365 ogg->page_pos = -1;
366 }
367
368 c = avio_r8(bc);
369
370 if (avio_feof(bc))
371 return AVERROR_EOF;
372
373 sync[sp++ & 3] = c;
374 } while (i++ < MAX_PAGE_SIZE);
375
376 if (i >= MAX_PAGE_SIZE) {
377 av_log(s, AV_LOG_INFO, "cannot find sync word\n");
378 return AVERROR_INVALIDDATA;
379 }
380
381 /* 0x4fa9b05f = av_crc(AV_CRC_32_IEEE, 0x0, "OggS", 4) */
382 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0x4fa9b05f);
383
384 /* To rewind if checksum is bad/check magic on switches - this is the max packet size */
385 ffio_ensure_seekback(bc, MAX_PAGE_SIZE);
386 start_pos = avio_tell(bc);
387
388 version = avio_r8(bc);
389 flags = avio_r8(bc);
390 gp = avio_rl64(bc);
391 serial = avio_rl32(bc);
392 avio_skip(bc, 4); /* seq */
393
394 crc_tmp = ffio_get_checksum(bc);
395 crc = avio_rb32(bc);
396 crc_tmp = ff_crc04C11DB7_update(crc_tmp, (uint8_t[4]){0}, 4);
397 ffio_init_checksum(bc, ff_crc04C11DB7_update, crc_tmp);
398
399 nsegs = avio_r8(bc);
400 page_pos = avio_tell(bc) - 27;
401
402 ret = avio_read(bc, segments, nsegs);
403 if (ret < nsegs)
404 return ret < 0 ? ret : AVERROR_EOF;
405
406 for (i = 0; i < nsegs; i++)
407 size += segments[i];
408
409 idx = ogg_find_stream(ogg, serial);
410 if (idx >= 0) {
411 os = ogg->streams + idx;
412
413 ret = buf_realloc(os, size);
414 if (ret < 0)
415 return ret;
416
417 readout_buf = os->buf + os->bufpos;
418 } else {
419 readout_buf = av_malloc(size);
420 }
421
422 ret = avio_read(bc, readout_buf, size);
423 if (ret < size) {
424 if (idx < 0)
425 av_free(readout_buf);
426 return ret < 0 ? ret : AVERROR_EOF;
427 }
428
429 if (crc ^ ffio_get_checksum(bc)) {
430 av_log(s, AV_LOG_ERROR, "CRC mismatch!\n");
431 if (idx < 0)
432 av_free(readout_buf);
433 avio_seek(bc, start_pos, SEEK_SET);
434 *sid = -1;
435 return 0;
436 }
437
438 /* Since we're almost sure its a valid packet, checking the version after
439 * the checksum lets the demuxer be more tolerant */
440 if (version) {
441 av_log(s, AV_LOG_ERROR, "Invalid Ogg vers!\n");
442 if (idx < 0)
443 av_free(readout_buf);
444 avio_seek(bc, start_pos, SEEK_SET);
445 *sid = -1;
446 return 0;
447 }
448
449 /* CRC is correct so we can be 99% sure there's an actual change here */
450 if (idx < 0) {
451 if (data_packets_seen(ogg))
452 idx = ogg_replace_stream(s, serial, readout_buf, size, probing);
453 else
454 idx = ogg_new_stream(s, serial);
455
456 if (idx < 0) {
457 av_log(s, AV_LOG_ERROR, "failed to create or replace stream\n");
458 av_free(readout_buf);
459 return idx;
460 }
461
462 os = ogg->streams + idx;
463
464 ret = buf_realloc(os, size);
465 if (ret < 0) {
466 av_free(readout_buf);
467 return ret;
468 }
469
470 memcpy(os->buf + os->bufpos, readout_buf, size);
471 av_free(readout_buf);
472 }
473
474 ogg->page_pos = page_pos;
475 os->page_pos = page_pos;
476 os->nsegs = nsegs;
477 os->segp = 0;
478 os->got_data = !(flags & OGG_FLAG_BOS);
479 os->bufpos += size;
480 os->granule = gp;
481 os->flags = flags;
482 memcpy(os->segments, segments, nsegs);
483 memset(os->buf + os->bufpos, 0, AV_INPUT_BUFFER_PADDING_SIZE);
484
485 if (flags & OGG_FLAG_CONT || os->incomplete) {
486 if (!os->psize) {
487 // If this is the very first segment we started
488 // playback in the middle of a continuation packet.
489 // Discard it since we missed the start of it.
490 while (os->segp < os->nsegs) {
491 int seg = os->segments[os->segp++];
492 os->pstart += seg;
493 if (seg < 255)
494 break;
495 }
496 os->sync_pos = os->page_pos;
497 }
498 } else {
499 os->psize = 0;
500 os->sync_pos = os->page_pos;
501 }
502
503 /* This function is always called with sid != NULL */
504 *sid = idx;
505
506 return 0;
507 }
508
509 /**
510 * @brief find the next Ogg packet
511 * @param *sid is set to the stream for the packet or -1 if there is
512 * no matching stream, in that case assume all other return
513 * values to be uninitialized.
514 * @return negative value on error or EOF.
515 */
ogg_packet(AVFormatContext * s,int * sid,int * dstart,int * dsize,int64_t * fpos)516 static int ogg_packet(AVFormatContext *s, int *sid, int *dstart, int *dsize,
517 int64_t *fpos)
518 {
519 struct ogg *ogg = s->priv_data;
520 int idx, i, ret;
521 struct ogg_stream *os;
522 int complete = 0;
523 int segp = 0, psize = 0;
524
525 av_log(s, AV_LOG_TRACE, "ogg_packet: curidx=%i\n", ogg->curidx);
526 if (sid)
527 *sid = -1;
528
529 do {
530 idx = ogg->curidx;
531
532 while (idx < 0) {
533 ret = ogg_read_page(s, &idx, 0);
534 if (ret < 0)
535 return ret;
536 }
537
538 os = ogg->streams + idx;
539
540 av_log(s, AV_LOG_TRACE, "ogg_packet: idx=%d pstart=%d psize=%d segp=%d nsegs=%d\n",
541 idx, os->pstart, os->psize, os->segp, os->nsegs);
542
543 if (!os->codec) {
544 if (os->header < 0) {
545 os->codec = ogg_find_codec(os->buf, os->bufpos);
546 if (!os->codec) {
547 av_log(s, AV_LOG_WARNING, "Codec not found\n");
548 os->header = 0;
549 return 0;
550 }
551 } else {
552 return 0;
553 }
554 }
555
556 segp = os->segp;
557 psize = os->psize;
558
559 while (os->segp < os->nsegs) {
560 int ss = os->segments[os->segp++];
561 os->psize += ss;
562 if (ss < 255) {
563 complete = 1;
564 break;
565 }
566 }
567
568 if (!complete && os->segp == os->nsegs) {
569 ogg->curidx = -1;
570 // Do not set incomplete for empty packets.
571 // Together with the code in ogg_read_page
572 // that discards all continuation of empty packets
573 // we would get an infinite loop.
574 os->incomplete = !!os->psize;
575 }
576 } while (!complete);
577
578
579 if (os->granule == -1)
580 av_log(s, AV_LOG_WARNING,
581 "Page at %"PRId64" is missing granule\n",
582 os->page_pos);
583
584 ogg->curidx = idx;
585 os->incomplete = 0;
586
587 if (os->header) {
588 if ((ret = os->codec->header(s, idx)) < 0) {
589 av_log(s, AV_LOG_ERROR, "Header processing failed: %s\n", av_err2str(ret));
590 return ret;
591 }
592 os->header = ret;
593 if (!os->header) {
594 os->segp = segp;
595 os->psize = psize;
596
597 // We have reached the first non-header packet in this stream.
598 // Unfortunately more header packets may still follow for others,
599 // but if we continue with header parsing we may lose data packets.
600 ogg->headers = 1;
601
602 // Update the header state for all streams and
603 // compute the data_offset.
604 if (!s->internal->data_offset)
605 s->internal->data_offset = os->sync_pos;
606
607 for (i = 0; i < ogg->nstreams; i++) {
608 struct ogg_stream *cur_os = ogg->streams + i;
609
610 // if we have a partial non-header packet, its start is
611 // obviously at or after the data start
612 if (cur_os->incomplete)
613 s->internal->data_offset = FFMIN(s->internal->data_offset, cur_os->sync_pos);
614 }
615 } else {
616 os->nb_header++;
617 os->pstart += os->psize;
618 os->psize = 0;
619 }
620 } else {
621 os->pflags = 0;
622 os->pduration = 0;
623 if (os->codec && os->codec->packet) {
624 if ((ret = os->codec->packet(s, idx)) < 0) {
625 av_log(s, AV_LOG_ERROR, "Packet processing failed: %s\n", av_err2str(ret));
626 return ret;
627 }
628 }
629 if (sid)
630 *sid = idx;
631 if (dstart)
632 *dstart = os->pstart;
633 if (dsize)
634 *dsize = os->psize;
635 if (fpos)
636 *fpos = os->sync_pos;
637 os->pstart += os->psize;
638 os->psize = 0;
639 if(os->pstart == os->bufpos)
640 os->bufpos = os->pstart = 0;
641 os->sync_pos = os->page_pos;
642 }
643
644 // determine whether there are more complete packets in this page
645 // if not, the page's granule will apply to this packet
646 os->page_end = 1;
647 for (i = os->segp; i < os->nsegs; i++)
648 if (os->segments[i] < 255) {
649 os->page_end = 0;
650 break;
651 }
652
653 if (os->segp == os->nsegs)
654 ogg->curidx = -1;
655
656 return 0;
657 }
658
ogg_get_length(AVFormatContext * s)659 static int ogg_get_length(AVFormatContext *s)
660 {
661 struct ogg *ogg = s->priv_data;
662 int i, ret;
663 int64_t size, end;
664 int streams_left=0;
665
666 if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL))
667 return 0;
668
669 // already set
670 if (s->duration != AV_NOPTS_VALUE)
671 return 0;
672
673 size = avio_size(s->pb);
674 if (size < 0)
675 return 0;
676 end = size > MAX_PAGE_SIZE ? size - MAX_PAGE_SIZE : 0;
677
678 ret = ogg_save(s);
679 if (ret < 0)
680 return ret;
681 avio_seek(s->pb, end, SEEK_SET);
682 ogg->page_pos = -1;
683
684 while (!ogg_read_page(s, &i, 1)) {
685 if (i >= 0 && ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0 &&
686 ogg->streams[i].codec) {
687 s->streams[i]->duration =
688 ogg_gptopts(s, i, ogg->streams[i].granule, NULL);
689 if (s->streams[i]->start_time != AV_NOPTS_VALUE) {
690 s->streams[i]->duration -= s->streams[i]->start_time;
691 streams_left-= (ogg->streams[i].got_start==-1);
692 ogg->streams[i].got_start= 1;
693 } else if(!ogg->streams[i].got_start) {
694 ogg->streams[i].got_start= -1;
695 streams_left++;
696 }
697 }
698 }
699
700 ogg_restore(s);
701
702 ret = ogg_save(s);
703 if (ret < 0)
704 return ret;
705
706 avio_seek (s->pb, s->internal->data_offset, SEEK_SET);
707 ogg_reset(s);
708 while (streams_left > 0 && !ogg_packet(s, &i, NULL, NULL, NULL)) {
709 int64_t pts;
710 if (i < 0) continue;
711 pts = ogg_calc_pts(s, i, NULL);
712 if (s->streams[i]->duration == AV_NOPTS_VALUE)
713 continue;
714 if (pts != AV_NOPTS_VALUE && s->streams[i]->start_time == AV_NOPTS_VALUE && !ogg->streams[i].got_start) {
715 s->streams[i]->duration -= pts;
716 ogg->streams[i].got_start= 1;
717 streams_left--;
718 }else if(s->streams[i]->start_time != AV_NOPTS_VALUE && !ogg->streams[i].got_start) {
719 ogg->streams[i].got_start= 1;
720 streams_left--;
721 }
722 }
723 ogg_restore (s);
724
725 return 0;
726 }
727
ogg_read_close(AVFormatContext * s)728 static int ogg_read_close(AVFormatContext *s)
729 {
730 struct ogg *ogg = s->priv_data;
731 int i;
732
733 for (i = 0; i < ogg->nstreams; i++) {
734 free_stream(s, i);
735 }
736
737 ogg->nstreams = 0;
738
739 av_freep(&ogg->streams);
740 return 0;
741 }
742
ogg_read_header(AVFormatContext * s)743 static int ogg_read_header(AVFormatContext *s)
744 {
745 struct ogg *ogg = s->priv_data;
746 int ret, i;
747
748 ogg->curidx = -1;
749
750 //linear headers seek from start
751 do {
752 ret = ogg_packet(s, NULL, NULL, NULL, NULL);
753 if (ret < 0) {
754 ogg_read_close(s);
755 return ret;
756 }
757 } while (!ogg->headers);
758 av_log(s, AV_LOG_TRACE, "found headers\n");
759
760 for (i = 0; i < ogg->nstreams; i++) {
761 struct ogg_stream *os = ogg->streams + i;
762
763 if (ogg->streams[i].header < 0) {
764 av_log(s, AV_LOG_ERROR, "Header parsing failed for stream %d\n", i);
765 ogg->streams[i].codec = NULL;
766 av_freep(&ogg->streams[i].private);
767 } else if (os->codec && os->nb_header < os->codec->nb_header) {
768 av_log(s, AV_LOG_WARNING,
769 "Headers mismatch for stream %d: "
770 "expected %d received %d.\n",
771 i, os->codec->nb_header, os->nb_header);
772 if (s->error_recognition & AV_EF_EXPLODE) {
773 ogg_read_close(s);
774 return AVERROR_INVALIDDATA;
775 }
776 }
777 if (os->start_granule != OGG_NOGRANULE_VALUE)
778 os->lastpts = s->streams[i]->start_time =
779 ogg_gptopts(s, i, os->start_granule, NULL);
780 }
781
782 //linear granulepos seek from end
783 ret = ogg_get_length(s);
784 if (ret < 0) {
785 ogg_read_close(s);
786 return ret;
787 }
788
789 return 0;
790 }
791
ogg_calc_pts(AVFormatContext * s,int idx,int64_t * dts)792 static int64_t ogg_calc_pts(AVFormatContext *s, int idx, int64_t *dts)
793 {
794 struct ogg *ogg = s->priv_data;
795 struct ogg_stream *os = ogg->streams + idx;
796 int64_t pts = AV_NOPTS_VALUE;
797
798 if (dts)
799 *dts = AV_NOPTS_VALUE;
800
801 if (os->lastpts != AV_NOPTS_VALUE) {
802 pts = os->lastpts;
803 os->lastpts = AV_NOPTS_VALUE;
804 }
805 if (os->lastdts != AV_NOPTS_VALUE) {
806 if (dts)
807 *dts = os->lastdts;
808 os->lastdts = AV_NOPTS_VALUE;
809 }
810 if (os->page_end) {
811 if (os->granule != -1LL) {
812 if (os->codec && os->codec->granule_is_start)
813 pts = ogg_gptopts(s, idx, os->granule, dts);
814 else
815 os->lastpts = ogg_gptopts(s, idx, os->granule, &os->lastdts);
816 os->granule = -1LL;
817 }
818 }
819 return pts;
820 }
821
ogg_validate_keyframe(AVFormatContext * s,int idx,int pstart,int psize)822 static void ogg_validate_keyframe(AVFormatContext *s, int idx, int pstart, int psize)
823 {
824 struct ogg *ogg = s->priv_data;
825 struct ogg_stream *os = ogg->streams + idx;
826 int invalid = 0;
827 if (psize) {
828 switch (s->streams[idx]->codecpar->codec_id) {
829 case AV_CODEC_ID_THEORA:
830 invalid = !!(os->pflags & AV_PKT_FLAG_KEY) != !(os->buf[pstart] & 0x40);
831 break;
832 case AV_CODEC_ID_VP8:
833 invalid = !!(os->pflags & AV_PKT_FLAG_KEY) != !(os->buf[pstart] & 1);
834 }
835 if (invalid) {
836 os->pflags ^= AV_PKT_FLAG_KEY;
837 av_log(s, AV_LOG_WARNING, "Broken file, %skeyframe not correctly marked.\n",
838 (os->pflags & AV_PKT_FLAG_KEY) ? "" : "non-");
839 }
840 }
841 }
842
ogg_read_packet(AVFormatContext * s,AVPacket * pkt)843 static int ogg_read_packet(AVFormatContext *s, AVPacket *pkt)
844 {
845 struct ogg *ogg;
846 struct ogg_stream *os;
847 int idx, ret;
848 int pstart, psize;
849 int64_t fpos, pts, dts;
850
851 if (s->io_repositioned) {
852 ogg_reset(s);
853 s->io_repositioned = 0;
854 }
855
856 //Get an ogg packet
857 retry:
858 do {
859 ret = ogg_packet(s, &idx, &pstart, &psize, &fpos);
860 if (ret < 0)
861 return ret;
862 } while (idx < 0 || !s->streams[idx]);
863
864 ogg = s->priv_data;
865 os = ogg->streams + idx;
866
867 // pflags might not be set until after this
868 pts = ogg_calc_pts(s, idx, &dts);
869 ogg_validate_keyframe(s, idx, pstart, psize);
870
871 if (os->keyframe_seek && !(os->pflags & AV_PKT_FLAG_KEY))
872 goto retry;
873 os->keyframe_seek = 0;
874
875 //Alloc a pkt
876 ret = av_new_packet(pkt, psize);
877 if (ret < 0)
878 return ret;
879 pkt->stream_index = idx;
880 memcpy(pkt->data, os->buf + pstart, psize);
881
882 pkt->pts = pts;
883 pkt->dts = dts;
884 pkt->flags = os->pflags;
885 pkt->duration = os->pduration;
886 pkt->pos = fpos;
887
888 if (os->start_trimming || os->end_trimming) {
889 uint8_t *side_data = av_packet_new_side_data(pkt,
890 AV_PKT_DATA_SKIP_SAMPLES,
891 10);
892 if(!side_data)
893 return AVERROR(ENOMEM);
894 AV_WL32(side_data + 0, os->start_trimming);
895 AV_WL32(side_data + 4, os->end_trimming);
896 os->start_trimming = 0;
897 os->end_trimming = 0;
898 }
899
900 if (os->new_metadata) {
901 ret = av_packet_add_side_data(pkt, AV_PKT_DATA_METADATA_UPDATE,
902 os->new_metadata, os->new_metadata_size);
903 if (ret < 0)
904 return ret;
905
906 os->new_metadata = NULL;
907 os->new_metadata_size = 0;
908 }
909
910 return psize;
911 }
912
ogg_read_timestamp(AVFormatContext * s,int stream_index,int64_t * pos_arg,int64_t pos_limit)913 static int64_t ogg_read_timestamp(AVFormatContext *s, int stream_index,
914 int64_t *pos_arg, int64_t pos_limit)
915 {
916 struct ogg *ogg = s->priv_data;
917 AVIOContext *bc = s->pb;
918 int64_t pts = AV_NOPTS_VALUE;
919 int64_t keypos = -1;
920 int i;
921 int pstart, psize;
922 avio_seek(bc, *pos_arg, SEEK_SET);
923 ogg_reset(s);
924
925 while ( avio_tell(bc) <= pos_limit
926 && !ogg_packet(s, &i, &pstart, &psize, pos_arg)) {
927 if (i == stream_index) {
928 struct ogg_stream *os = ogg->streams + stream_index;
929 // Do not trust the last timestamps of an ogm video
930 if ( (os->flags & OGG_FLAG_EOS)
931 && !(os->flags & OGG_FLAG_BOS)
932 && os->codec == &ff_ogm_video_codec)
933 continue;
934 pts = ogg_calc_pts(s, i, NULL);
935 ogg_validate_keyframe(s, i, pstart, psize);
936 if (os->pflags & AV_PKT_FLAG_KEY) {
937 keypos = *pos_arg;
938 } else if (os->keyframe_seek) {
939 // if we had a previous keyframe but no pts for it,
940 // return that keyframe with this pts value.
941 if (keypos >= 0)
942 *pos_arg = keypos;
943 else
944 pts = AV_NOPTS_VALUE;
945 }
946 }
947 if (pts != AV_NOPTS_VALUE)
948 break;
949 }
950 ogg_reset(s);
951 return pts;
952 }
953
ogg_read_seek(AVFormatContext * s,int stream_index,int64_t timestamp,int flags)954 static int ogg_read_seek(AVFormatContext *s, int stream_index,
955 int64_t timestamp, int flags)
956 {
957 struct ogg *ogg = s->priv_data;
958 struct ogg_stream *os = ogg->streams + stream_index;
959 int ret;
960
961 av_assert0(stream_index < ogg->nstreams);
962 // Ensure everything is reset even when seeking via
963 // the generated index.
964 ogg_reset(s);
965
966 // Try seeking to a keyframe first. If this fails (very possible),
967 // av_seek_frame will fall back to ignoring keyframes
968 if (s->streams[stream_index]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO
969 && !(flags & AVSEEK_FLAG_ANY))
970 os->keyframe_seek = 1;
971
972 ret = ff_seek_frame_binary(s, stream_index, timestamp, flags);
973 ogg_reset(s);
974 os = ogg->streams + stream_index;
975 if (ret < 0)
976 os->keyframe_seek = 0;
977 return ret;
978 }
979
ogg_probe(const AVProbeData * p)980 static int ogg_probe(const AVProbeData *p)
981 {
982 if (!memcmp("OggS", p->buf, 5) && p->buf[5] <= 0x7)
983 return AVPROBE_SCORE_MAX;
984 return 0;
985 }
986
987 AVInputFormat ff_ogg_demuxer = {
988 .name = "ogg",
989 .long_name = NULL_IF_CONFIG_SMALL("Ogg"),
990 .priv_data_size = sizeof(struct ogg),
991 .read_probe = ogg_probe,
992 .read_header = ogg_read_header,
993 .read_packet = ogg_read_packet,
994 .read_close = ogg_read_close,
995 .read_seek = ogg_read_seek,
996 .read_timestamp = ogg_read_timestamp,
997 .extensions = "ogg",
998 .flags = AVFMT_GENERIC_INDEX | AVFMT_TS_DISCONT | AVFMT_NOBINSEARCH,
999 };
1000