2 * Ogg bitstream support
3 * Luca Barbato <lu_zero@gentoo.org>
4 * Based on tcvp implementation
8 Copyright (C) 2005 Michael Ahlberg, Måns Rullgård
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:
18 The above copyright notice and this permission notice shall be
19 included in all copies or substantial portions of the Software.
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.
35 #include "vorbiscomment.h"
37 #define MAX_PAGE_SIZE 65307
38 #define DECODER_BUFFER_SIZE MAX_PAGE_SIZE
40 static const struct ogg_codec * const ogg_codecs[] = {
57 //FIXME We could avoid some structure duplication
58 static int ogg_save(AVFormatContext *s)
60 struct ogg *ogg = s->priv_data;
61 struct ogg_state *ost =
62 av_malloc(sizeof (*ost) + (ogg->nstreams-1) * sizeof (*ogg->streams));
64 ost->pos = avio_tell (s->pb);
65 ost->curidx = ogg->curidx;
66 ost->next = ogg->state;
67 ost->nstreams = ogg->nstreams;
68 memcpy(ost->streams, ogg->streams, ogg->nstreams * sizeof(*ogg->streams));
70 for (i = 0; i < ogg->nstreams; i++){
71 struct ogg_stream *os = ogg->streams + i;
72 os->buf = av_malloc (os->bufsize);
73 memset (os->buf, 0, os->bufsize);
74 memcpy (os->buf, ost->streams[i].buf, os->bufpos);
82 static int ogg_restore(AVFormatContext *s, int discard)
84 struct ogg *ogg = s->priv_data;
85 AVIOContext *bc = s->pb;
86 struct ogg_state *ost = ogg->state;
92 ogg->state = ost->next;
95 struct ogg_stream *old_streams = ogg->streams;
97 for (i = 0; i < ogg->nstreams; i++)
98 av_free (ogg->streams[i].buf);
100 avio_seek (bc, ost->pos, SEEK_SET);
101 ogg->curidx = ost->curidx;
102 ogg->nstreams = ost->nstreams;
103 ogg->streams = av_realloc (ogg->streams,
104 ogg->nstreams * sizeof (*ogg->streams));
107 memcpy(ogg->streams, ost->streams,
108 ost->nstreams * sizeof(*ogg->streams));
110 av_free(old_streams);
120 static int ogg_reset(struct ogg *ogg)
124 for (i = 0; i < ogg->nstreams; i++){
125 struct ogg_stream *os = ogg->streams + i;
130 os->lastpts = AV_NOPTS_VALUE;
131 os->lastdts = AV_NOPTS_VALUE;
144 static const struct ogg_codec *ogg_find_codec(uint8_t *buf, int size)
148 for (i = 0; ogg_codecs[i]; i++)
149 if (size >= ogg_codecs[i]->magicsize &&
150 !memcmp (buf, ogg_codecs[i]->magic, ogg_codecs[i]->magicsize))
151 return ogg_codecs[i];
156 static int ogg_new_stream(AVFormatContext *s, uint32_t serial, int new_avstream)
159 struct ogg *ogg = s->priv_data;
160 int idx = ogg->nstreams++;
162 struct ogg_stream *os;
164 ogg->streams = av_realloc (ogg->streams,
165 ogg->nstreams * sizeof (*ogg->streams));
166 memset (ogg->streams + idx, 0, sizeof (*ogg->streams));
167 os = ogg->streams + idx;
169 os->bufsize = DECODER_BUFFER_SIZE;
170 os->buf = av_malloc(os->bufsize);
174 st = avformat_new_stream(s, NULL);
176 return AVERROR(ENOMEM);
179 avpriv_set_pts_info(st, 64, 1, 1000000);
185 static int ogg_new_buf(struct ogg *ogg, int idx)
187 struct ogg_stream *os = ogg->streams + idx;
188 uint8_t *nb = av_malloc(os->bufsize);
189 int size = os->bufpos - os->pstart;
191 memcpy(nb, os->buf + os->pstart, size);
201 static int ogg_read_page(AVFormatContext *s, int *str)
203 AVIOContext *bc = s->pb;
204 struct ogg *ogg = s->priv_data;
205 struct ogg_stream *os;
214 ret = avio_read(bc, sync, 4);
216 return ret < 0 ? ret : AVERROR_EOF;
221 if (sync[sp & 3] == 'O' &&
222 sync[(sp + 1) & 3] == 'g' &&
223 sync[(sp + 2) & 3] == 'g' && sync[(sp + 3) & 3] == 'S')
230 }while (i++ < MAX_PAGE_SIZE);
232 if (i >= MAX_PAGE_SIZE){
233 av_log (s, AV_LOG_INFO, "ogg, can't find sync word\n");
234 return AVERROR_INVALIDDATA;
237 if (avio_r8(bc) != 0) /* version */
238 return AVERROR_INVALIDDATA;
242 serial = avio_rl32 (bc);
243 avio_skip(bc, 8); /* seq, crc */
246 idx = ogg_find_stream (ogg, serial);
251 for (n = 0; n < ogg->nstreams; n++) {
252 av_freep(&ogg->streams[n].buf);
253 if (!ogg->state || ogg->state->streams[n].private != ogg->streams[n].private)
254 av_freep(&ogg->streams[n].private);
258 idx = ogg_new_stream(s, serial, 0);
260 idx = ogg_new_stream(s, serial, 1);
266 os = ogg->streams + idx;
267 os->page_pos = avio_tell(bc) - 27;
270 ogg_new_buf(ogg, idx);
272 ret = avio_read(bc, os->segments, nsegs);
274 return ret < 0 ? ret : AVERROR_EOF;
280 for (i = 0; i < nsegs; i++)
281 size += os->segments[i];
283 if (flags & OGG_FLAG_CONT || os->incomplete){
285 // If this is the very first segment we started
286 // playback in the middle of a continuation packet.
287 // Discard it since we missed the start of it.
288 while (os->segp < os->nsegs){
289 int seg = os->segments[os->segp++];
294 os->sync_pos = os->page_pos;
298 os->sync_pos = os->page_pos;
301 if (os->bufsize - os->bufpos < size){
302 uint8_t *nb = av_malloc (os->bufsize *= 2);
303 memcpy (nb, os->buf, os->bufpos);
308 ret = avio_read(bc, os->buf + os->bufpos, size);
310 return ret < 0 ? ret : AVERROR_EOF;
322 static int ogg_packet(AVFormatContext *s, int *str, int *dstart, int *dsize,
325 struct ogg *ogg = s->priv_data;
327 struct ogg_stream *os;
329 int segp = 0, psize = 0;
331 av_dlog(s, "ogg_packet: curidx=%i\n", ogg->curidx);
337 ret = ogg_read_page(s, &idx);
342 os = ogg->streams + idx;
344 av_dlog(s, "ogg_packet: idx=%d pstart=%d psize=%d segp=%d nsegs=%d\n",
345 idx, os->pstart, os->psize, os->segp, os->nsegs);
349 os->codec = ogg_find_codec (os->buf, os->bufpos);
351 av_log(s, AV_LOG_WARNING, "Codec not found\n");
363 while (os->segp < os->nsegs){
364 int ss = os->segments[os->segp++];
372 if (!complete && os->segp == os->nsegs){
374 // Do not set incomplete for empty packets.
375 // Together with the code in ogg_read_page
376 // that discards all continuation of empty packets
377 // we would get an infinite loop.
378 os->incomplete = !!os->psize;
383 if (os->granule == -1)
384 av_log(s, AV_LOG_WARNING, "Page at %"PRId64" is missing granule\n", os->page_pos);
390 os->header = os->codec->header (s, idx);
395 // We have reached the first non-header packet in this stream.
396 // Unfortunately more header packets may still follow for others,
397 // but if we continue with header parsing we may lose data packets.
400 // Update the header state for all streams and
401 // compute the data_offset.
403 s->data_offset = os->sync_pos;
404 for (i = 0; i < ogg->nstreams; i++) {
405 struct ogg_stream *cur_os = ogg->streams + i;
407 // if we have a partial non-header packet, its start is
408 // obviously at or after the data start
409 if (cur_os->incomplete)
410 s->data_offset = FFMIN(s->data_offset, cur_os->sync_pos);
413 os->pstart += os->psize;
419 if (os->codec && os->codec->packet)
420 os->codec->packet (s, idx);
424 *dstart = os->pstart;
428 *fpos = os->sync_pos;
429 os->pstart += os->psize;
431 if(os->pstart == os->bufpos)
432 os->bufpos = os->pstart = 0;
433 os->sync_pos = os->page_pos;
436 // determine whether there are more complete packets in this page
437 // if not, the page's granule will apply to this packet
439 for (i = os->segp; i < os->nsegs; i++)
440 if (os->segments[i] < 255) {
445 if (os->segp == os->nsegs)
451 static int ogg_get_headers(AVFormatContext *s)
453 struct ogg *ogg = s->priv_data;
457 ret = ogg_packet(s, NULL, NULL, NULL, NULL);
460 }while (!ogg->headers);
462 av_dlog(s, "found headers\n");
467 static int ogg_get_length(AVFormatContext *s)
469 struct ogg *ogg = s->priv_data;
478 if (s->duration != AV_NOPTS_VALUE)
481 size = avio_size(s->pb);
484 end = size > MAX_PAGE_SIZE? size - MAX_PAGE_SIZE: 0;
487 avio_seek (s->pb, end, SEEK_SET);
489 while (!ogg_read_page (s, &i)){
490 if (ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0 &&
491 ogg->streams[i].codec) {
492 s->streams[i]->duration =
493 ogg_gptopts (s, i, ogg->streams[i].granule, NULL);
494 if (s->streams[i]->start_time != AV_NOPTS_VALUE){
495 s->streams[i]->duration -= s->streams[i]->start_time;
496 streams_left-= (ogg->streams[i].got_start==-1);
497 ogg->streams[i].got_start= 1;
498 }else if(!ogg->streams[i].got_start){
499 ogg->streams[i].got_start= -1;
508 avio_seek (s->pb, 0, SEEK_SET);
509 while (!ogg_read_page (s, &i)){
510 if (ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0 &&
511 ogg->streams[i].codec) {
512 if(s->streams[i]->duration && s->streams[i]->start_time == AV_NOPTS_VALUE && !ogg->streams[i].got_start){
513 int64_t start= ogg_gptopts (s, i, ogg->streams[i].granule, NULL);
514 if(av_rescale_q(start, s->streams[i]->time_base, AV_TIME_BASE_Q) > AV_TIME_BASE)
515 s->streams[i]->duration -= start;
516 ogg->streams[i].got_start= 1;
528 static int ogg_read_header(AVFormatContext *s)
530 struct ogg *ogg = s->priv_data;
533 //linear headers seek from start
534 ret = ogg_get_headers(s);
538 for (i = 0; i < ogg->nstreams; i++)
539 if (ogg->streams[i].header < 0)
540 ogg->streams[i].codec = NULL;
542 //linear granulepos seek from end
545 //fill the extradata in the per codec callbacks
549 static int64_t ogg_calc_pts(AVFormatContext *s, int idx, int64_t *dts)
551 struct ogg *ogg = s->priv_data;
552 struct ogg_stream *os = ogg->streams + idx;
553 int64_t pts = AV_NOPTS_VALUE;
556 *dts = AV_NOPTS_VALUE;
558 if (os->lastpts != AV_NOPTS_VALUE) {
560 os->lastpts = AV_NOPTS_VALUE;
562 if (os->lastdts != AV_NOPTS_VALUE) {
565 os->lastdts = AV_NOPTS_VALUE;
568 if (os->granule != -1LL) {
569 if (os->codec && os->codec->granule_is_start)
570 pts = ogg_gptopts(s, idx, os->granule, dts);
572 os->lastpts = ogg_gptopts(s, idx, os->granule, &os->lastdts);
579 static int ogg_read_packet(AVFormatContext *s, AVPacket *pkt)
582 struct ogg_stream *os;
585 int64_t fpos, pts, dts;
590 ret = ogg_packet(s, &idx, &pstart, &psize, &fpos);
593 }while (idx < 0 || !s->streams[idx]);
596 os = ogg->streams + idx;
598 // pflags might not be set until after this
599 pts = ogg_calc_pts(s, idx, &dts);
601 if (os->keyframe_seek && !(os->pflags & AV_PKT_FLAG_KEY))
603 os->keyframe_seek = 0;
606 ret = av_new_packet(pkt, psize);
609 pkt->stream_index = idx;
610 memcpy (pkt->data, os->buf + pstart, psize);
614 pkt->flags = os->pflags;
615 pkt->duration = os->pduration;
621 static int ogg_read_close(AVFormatContext *s)
623 struct ogg *ogg = s->priv_data;
626 for (i = 0; i < ogg->nstreams; i++){
627 av_free (ogg->streams[i].buf);
628 av_free (ogg->streams[i].private);
630 av_free (ogg->streams);
634 static int64_t ogg_read_timestamp(AVFormatContext *s, int stream_index,
635 int64_t *pos_arg, int64_t pos_limit)
637 struct ogg *ogg = s->priv_data;
638 AVIOContext *bc = s->pb;
639 int64_t pts = AV_NOPTS_VALUE;
642 avio_seek(bc, *pos_arg, SEEK_SET);
645 while (avio_tell(bc) < pos_limit && !ogg_packet(s, &i, NULL, NULL, pos_arg)) {
646 if (i == stream_index) {
647 struct ogg_stream *os = ogg->streams + stream_index;
648 pts = ogg_calc_pts(s, i, NULL);
649 if (os->pflags & AV_PKT_FLAG_KEY) {
651 } else if (os->keyframe_seek) {
652 // if we had a previous keyframe but no pts for it,
653 // return that keyframe with this pts value.
657 pts = AV_NOPTS_VALUE;
660 if (pts != AV_NOPTS_VALUE)
667 static int ogg_read_seek(AVFormatContext *s, int stream_index,
668 int64_t timestamp, int flags)
670 struct ogg *ogg = s->priv_data;
671 struct ogg_stream *os = ogg->streams + stream_index;
674 // Try seeking to a keyframe first. If this fails (very possible),
675 // av_seek_frame will fall back to ignoring keyframes
676 if (s->streams[stream_index]->codec->codec_type == AVMEDIA_TYPE_VIDEO
677 && !(flags & AVSEEK_FLAG_ANY))
678 os->keyframe_seek = 1;
680 ret = ff_seek_frame_binary(s, stream_index, timestamp, flags);
681 os = ogg->streams + stream_index;
683 os->keyframe_seek = 0;
687 static int ogg_probe(AVProbeData *p)
689 if (!memcmp("OggS", p->buf, 5) && p->buf[5] <= 0x7)
690 return AVPROBE_SCORE_MAX;
694 AVInputFormat ff_ogg_demuxer = {
696 .long_name = NULL_IF_CONFIG_SMALL("Ogg"),
697 .priv_data_size = sizeof(struct ogg),
698 .read_probe = ogg_probe,
699 .read_header = ogg_read_header,
700 .read_packet = ogg_read_packet,
701 .read_close = ogg_read_close,
702 .read_seek = ogg_read_seek,
703 .read_timestamp = ogg_read_timestamp,
705 .flags = AVFMT_GENERIC_INDEX,