2 * Ogg bitstream support
3 * Luca Barbato <lu_zero@gentoo.org>
4 * Based on tcvp implementation
9 Copyright (C) 2005 Michael Ahlberg, Måns Rullgård
11 Permission is hereby granted, free of charge, to any person
12 obtaining a copy of this software and associated documentation
13 files (the "Software"), to deal in the Software without
14 restriction, including without limitation the rights to use, copy,
15 modify, merge, publish, distribute, sublicense, and/or sell copies
16 of the Software, and to permit persons to whom the Software is
17 furnished to do so, subject to the following conditions:
19 The above copyright notice and this permission notice shall be
20 included in all copies or substantial portions of the Software.
22 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
23 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
24 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
25 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
26 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
27 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
28 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
29 DEALINGS IN THE SOFTWARE.
36 #include "vorbiscomment.h"
38 #define MAX_PAGE_SIZE 65307
39 #define DECODER_BUFFER_SIZE MAX_PAGE_SIZE
41 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 for (i = 0; i < ogg->nstreams; i++)
96 av_free (ogg->streams[i].buf);
98 avio_seek (bc, ost->pos, SEEK_SET);
99 ogg->curidx = ost->curidx;
100 ogg->nstreams = ost->nstreams;
101 memcpy(ogg->streams, ost->streams,
102 ost->nstreams * sizeof(*ogg->streams));
110 static int ogg_reset(struct ogg *ogg)
114 for (i = 0; i < ogg->nstreams; i++){
115 struct ogg_stream *os = ogg->streams + i;
120 os->lastpts = AV_NOPTS_VALUE;
121 os->lastdts = AV_NOPTS_VALUE;
134 static const struct ogg_codec *ogg_find_codec(uint8_t *buf, int size)
138 for (i = 0; ogg_codecs[i]; i++)
139 if (size >= ogg_codecs[i]->magicsize &&
140 !memcmp (buf, ogg_codecs[i]->magic, ogg_codecs[i]->magicsize))
141 return ogg_codecs[i];
146 static int ogg_new_stream(AVFormatContext *s, uint32_t serial, int new_avstream)
149 struct ogg *ogg = s->priv_data;
150 int idx = ogg->nstreams++;
152 struct ogg_stream *os;
154 ogg->streams = av_realloc (ogg->streams,
155 ogg->nstreams * sizeof (*ogg->streams));
156 memset (ogg->streams + idx, 0, sizeof (*ogg->streams));
157 os = ogg->streams + idx;
159 os->bufsize = DECODER_BUFFER_SIZE;
160 os->buf = av_malloc(os->bufsize);
164 st = av_new_stream(s, idx);
166 return AVERROR(ENOMEM);
168 av_set_pts_info(st, 64, 1, 1000000);
174 static int ogg_new_buf(struct ogg *ogg, int idx)
176 struct ogg_stream *os = ogg->streams + idx;
177 uint8_t *nb = av_malloc(os->bufsize);
178 int size = os->bufpos - os->pstart;
180 memcpy(nb, os->buf + os->pstart, size);
190 static int ogg_read_page(AVFormatContext *s, int *str)
192 AVIOContext *bc = s->pb;
193 struct ogg *ogg = s->priv_data;
194 struct ogg_stream *os;
205 if (avio_read (bc, sync, 4) < 4)
211 if (sync[sp & 3] == 'O' &&
212 sync[(sp + 1) & 3] == 'g' &&
213 sync[(sp + 2) & 3] == 'g' && sync[(sp + 3) & 3] == 'S')
220 }while (i++ < MAX_PAGE_SIZE);
222 if (i >= MAX_PAGE_SIZE){
223 av_log (s, AV_LOG_INFO, "ogg, can't find sync word\n");
227 if (avio_r8(bc) != 0) /* version */
232 serial = avio_rl32 (bc);
233 seq = avio_rl32 (bc);
234 crc = avio_rl32 (bc);
237 idx = ogg_find_stream (ogg, serial);
242 for (n = 0; n < ogg->nstreams; n++) {
243 av_freep(&ogg->streams[n].buf);
244 av_freep(&ogg->streams[n].private);
248 idx = ogg_new_stream(s, serial, 0);
250 idx = ogg_new_stream(s, serial, 1);
256 os = ogg->streams + idx;
257 os->page_pos = avio_tell(bc) - 27;
260 ogg_new_buf(ogg, idx);
262 if (avio_read (bc, os->segments, nsegs) < nsegs)
269 for (i = 0; i < nsegs; i++)
270 size += os->segments[i];
272 if (flags & OGG_FLAG_CONT || os->incomplete){
274 while (os->segp < os->nsegs){
275 int seg = os->segments[os->segp++];
280 os->sync_pos = os->page_pos;
284 os->sync_pos = os->page_pos;
287 if (os->bufsize - os->bufpos < size){
288 uint8_t *nb = av_malloc (os->bufsize *= 2);
289 memcpy (nb, os->buf, os->bufpos);
294 if (avio_read (bc, os->buf + os->bufpos, size) < size)
307 static int ogg_packet(AVFormatContext *s, int *str, int *dstart, int *dsize,
310 struct ogg *ogg = s->priv_data;
312 struct ogg_stream *os;
314 int segp = 0, psize = 0;
316 av_dlog(s, AV_LOG_DEBUG, "ogg_packet: curidx=%i\n", ogg->curidx);
322 if (ogg_read_page (s, &idx) < 0)
326 os = ogg->streams + idx;
328 av_dlog(s, AV_LOG_DEBUG,
329 "ogg_packet: idx=%d pstart=%d psize=%d segp=%d nsegs=%d\n",
330 idx, os->pstart, os->psize, os->segp, os->nsegs);
334 os->codec = ogg_find_codec (os->buf, os->bufpos);
347 while (os->segp < os->nsegs){
348 int ss = os->segments[os->segp++];
356 if (!complete && os->segp == os->nsegs){
362 av_dlog(s, AV_LOG_DEBUG,
363 "ogg_packet: idx %i, frame size %i, start %i\n",
364 idx, os->psize, os->pstart);
366 if (os->granule == -1)
367 av_log(s, AV_LOG_WARNING, "Page at %"PRId64" is missing granule\n", os->page_pos);
373 os->header = os->codec->header (s, idx);
378 // We have reached the first non-header packet in this stream.
379 // Unfortunately more header packets may still follow for others,
380 // so we reset this later unless we are done with the headers
384 // Update the header state for all streams and
385 // compute the data_offset.
387 s->data_offset = os->sync_pos;
388 for (i = 0; i < ogg->nstreams; i++) {
389 struct ogg_stream *cur_os = ogg->streams + i;
390 if (cur_os->header > 0)
393 // if we have a partial non-header packet, its start is
394 // obviously at or after the data start
395 if (cur_os->incomplete)
396 s->data_offset = FFMIN(s->data_offset, cur_os->sync_pos);
399 os->pstart += os->psize;
405 if (os->codec && os->codec->packet)
406 os->codec->packet (s, idx);
410 *dstart = os->pstart;
414 *fpos = os->sync_pos;
415 os->pstart += os->psize;
417 os->sync_pos = os->page_pos;
420 // determine whether there are more complete packets in this page
421 // if not, the page's granule will apply to this packet
423 for (i = os->segp; i < os->nsegs; i++)
424 if (os->segments[i] < 255) {
429 if (os->segp == os->nsegs)
435 static int ogg_get_headers(AVFormatContext *s)
437 struct ogg *ogg = s->priv_data;
440 if (ogg_packet (s, NULL, NULL, NULL, NULL) < 0)
442 }while (!ogg->headers);
444 av_dlog(s, AV_LOG_DEBUG, "found headers\n");
449 static int ogg_get_length(AVFormatContext *s)
451 struct ogg *ogg = s->priv_data;
459 if (s->duration != AV_NOPTS_VALUE)
462 size = avio_size(s->pb);
465 end = size > MAX_PAGE_SIZE? size - MAX_PAGE_SIZE: 0;
468 avio_seek (s->pb, end, SEEK_SET);
470 while (!ogg_read_page (s, &i)){
471 if (ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0 &&
472 ogg->streams[i].codec) {
473 s->streams[i]->duration =
474 ogg_gptopts (s, i, ogg->streams[i].granule, NULL);
475 if (s->streams[i]->start_time != AV_NOPTS_VALUE)
476 s->streams[i]->duration -= s->streams[i]->start_time;
485 static int ogg_read_header(AVFormatContext *s, AVFormatParameters *ap)
487 struct ogg *ogg = s->priv_data;
490 //linear headers seek from start
491 if (ogg_get_headers (s) < 0){
495 for (i = 0; i < ogg->nstreams; i++)
496 if (ogg->streams[i].header < 0)
497 ogg->streams[i].codec = NULL;
499 //linear granulepos seek from end
502 //fill the extradata in the per codec callbacks
506 static int64_t ogg_calc_pts(AVFormatContext *s, int idx, int64_t *dts)
508 struct ogg *ogg = s->priv_data;
509 struct ogg_stream *os = ogg->streams + idx;
510 int64_t pts = AV_NOPTS_VALUE;
513 *dts = AV_NOPTS_VALUE;
515 if (os->lastpts != AV_NOPTS_VALUE) {
517 os->lastpts = AV_NOPTS_VALUE;
519 if (os->lastdts != AV_NOPTS_VALUE) {
522 os->lastdts = AV_NOPTS_VALUE;
525 if (os->granule != -1LL) {
526 if (os->codec && os->codec->granule_is_start)
527 pts = ogg_gptopts(s, idx, os->granule, dts);
529 os->lastpts = ogg_gptopts(s, idx, os->granule, &os->lastdts);
536 static int ogg_read_packet(AVFormatContext *s, AVPacket *pkt)
539 struct ogg_stream *os;
542 int64_t fpos, pts, dts;
547 if (ogg_packet (s, &idx, &pstart, &psize, &fpos) < 0)
549 }while (idx < 0 || !s->streams[idx]);
552 os = ogg->streams + idx;
554 // pflags might not be set until after this
555 pts = ogg_calc_pts(s, idx, &dts);
557 if (os->keyframe_seek && !(os->pflags & AV_PKT_FLAG_KEY))
559 os->keyframe_seek = 0;
562 if (av_new_packet (pkt, psize) < 0)
564 pkt->stream_index = idx;
565 memcpy (pkt->data, os->buf + pstart, psize);
569 pkt->flags = os->pflags;
570 pkt->duration = os->pduration;
576 static int ogg_read_close(AVFormatContext *s)
578 struct ogg *ogg = s->priv_data;
581 for (i = 0; i < ogg->nstreams; i++){
582 av_free (ogg->streams[i].buf);
583 av_free (ogg->streams[i].private);
585 av_free (ogg->streams);
589 static int64_t ogg_read_timestamp(AVFormatContext *s, int stream_index,
590 int64_t *pos_arg, int64_t pos_limit)
592 struct ogg *ogg = s->priv_data;
593 struct ogg_stream *os = ogg->streams + stream_index;
594 AVIOContext *bc = s->pb;
595 int64_t pts = AV_NOPTS_VALUE;
597 avio_seek(bc, *pos_arg, SEEK_SET);
600 while (avio_tell(bc) < pos_limit && !ogg_packet(s, &i, NULL, NULL, pos_arg)) {
601 if (i == stream_index) {
602 pts = ogg_calc_pts(s, i, NULL);
603 if (os->keyframe_seek && !(os->pflags & AV_PKT_FLAG_KEY))
604 pts = AV_NOPTS_VALUE;
606 if (pts != AV_NOPTS_VALUE)
613 static int ogg_read_seek(AVFormatContext *s, int stream_index,
614 int64_t timestamp, int flags)
616 struct ogg *ogg = s->priv_data;
617 struct ogg_stream *os = ogg->streams + stream_index;
620 // Try seeking to a keyframe first. If this fails (very possible),
621 // av_seek_frame will fall back to ignoring keyframes
622 if (s->streams[stream_index]->codec->codec_type == AVMEDIA_TYPE_VIDEO
623 && !(flags & AVSEEK_FLAG_ANY))
624 os->keyframe_seek = 1;
626 ret = av_seek_frame_binary(s, stream_index, timestamp, flags);
628 os->keyframe_seek = 0;
632 static int ogg_probe(AVProbeData *p)
634 if (!memcmp("OggS", p->buf, 5) && p->buf[5] <= 0x7)
635 return AVPROBE_SCORE_MAX;
639 AVInputFormat ff_ogg_demuxer = {
641 .long_name = NULL_IF_CONFIG_SMALL("Ogg"),
642 .priv_data_size = sizeof(struct ogg),
643 .read_probe = ogg_probe,
644 .read_header = ogg_read_header,
645 .read_packet = ogg_read_packet,
646 .read_close = ogg_read_close,
647 .read_seek = ogg_read_seek,
648 .read_timestamp = ogg_read_timestamp,
650 .flags = AVFMT_GENERIC_INDEX,