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.
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[] = {
58 //FIXME We could avoid some structure duplication
59 static int ogg_save(AVFormatContext *s)
61 struct ogg *ogg = s->priv_data;
62 struct ogg_state *ost =
63 av_malloc(sizeof(*ost) + (ogg->nstreams - 1) * sizeof(*ogg->streams));
65 ost->pos = avio_tell(s->pb);
66 ost->curidx = ogg->curidx;
67 ost->next = ogg->state;
68 ost->nstreams = ogg->nstreams;
69 memcpy(ost->streams, ogg->streams, ogg->nstreams * sizeof(*ogg->streams));
71 for (i = 0; i < ogg->nstreams; i++) {
72 struct ogg_stream *os = ogg->streams + i;
73 os->buf = av_mallocz(os->bufsize + FF_INPUT_BUFFER_PADDING_SIZE);
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)
158 struct ogg *ogg = s->priv_data;
159 int idx = ogg->nstreams++;
161 struct ogg_stream *os;
163 os = av_realloc(ogg->streams, ogg->nstreams * sizeof(*ogg->streams));
166 return AVERROR(ENOMEM);
170 memset(ogg->streams + idx, 0, sizeof(*ogg->streams));
172 os = ogg->streams + idx;
174 os->bufsize = DECODER_BUFFER_SIZE;
175 os->buf = av_malloc(os->bufsize + FF_INPUT_BUFFER_PADDING_SIZE);
177 os->start_granule = OGG_NOGRANULE_VALUE;
180 st = avformat_new_stream(s, NULL);
182 return AVERROR(ENOMEM);
185 avpriv_set_pts_info(st, 64, 1, 1000000);
191 static int ogg_new_buf(struct ogg *ogg, int idx)
193 struct ogg_stream *os = ogg->streams + idx;
194 uint8_t *nb = av_malloc(os->bufsize + FF_INPUT_BUFFER_PADDING_SIZE);
195 int size = os->bufpos - os->pstart;
198 memcpy(nb, os->buf + os->pstart, size);
209 static int ogg_read_page(AVFormatContext *s, int *str)
211 AVIOContext *bc = s->pb;
212 struct ogg *ogg = s->priv_data;
213 struct ogg_stream *os;
222 ret = avio_read(bc, sync, 4);
224 return ret < 0 ? ret : AVERROR_EOF;
229 if (sync[sp & 3] == 'O' &&
230 sync[(sp + 1) & 3] == 'g' &&
231 sync[(sp + 2) & 3] == 'g' && sync[(sp + 3) & 3] == 'S')
240 } while (i++ < MAX_PAGE_SIZE);
242 if (i >= MAX_PAGE_SIZE) {
243 av_log(s, AV_LOG_INFO, "cannot find sync word\n");
244 return AVERROR_INVALIDDATA;
247 if (avio_r8(bc) != 0) /* version */
248 return AVERROR_INVALIDDATA;
252 serial = avio_rl32(bc);
253 avio_skip(bc, 8); /* seq, crc */
256 idx = ogg_find_stream(ogg, serial);
261 for (n = 0; n < ogg->nstreams; n++) {
262 av_freep(&ogg->streams[n].buf);
264 ogg->state->streams[n].private != ogg->streams[n].private)
265 av_freep(&ogg->streams[n].private);
271 idx = ogg_new_stream(s, serial, 0);
273 idx = ogg_new_stream(s, serial, 1);
279 os = ogg->streams + idx;
280 os->page_pos = avio_tell(bc) - 27;
283 ogg_new_buf(ogg, idx);
285 ret = avio_read(bc, os->segments, nsegs);
287 return ret < 0 ? ret : AVERROR_EOF;
293 for (i = 0; i < nsegs; i++)
294 size += os->segments[i];
296 if (flags & OGG_FLAG_CONT || os->incomplete) {
298 while (os->segp < os->nsegs) {
299 int seg = os->segments[os->segp++];
304 os->sync_pos = os->page_pos;
308 os->sync_pos = os->page_pos;
311 if (os->bufsize - os->bufpos < size) {
312 uint8_t *nb = av_malloc((os->bufsize *= 2) + FF_INPUT_BUFFER_PADDING_SIZE);
314 return AVERROR(ENOMEM);
315 memcpy(nb, os->buf, os->bufpos);
320 ret = avio_read(bc, os->buf + os->bufpos, size);
322 return ret < 0 ? ret : AVERROR_EOF;
328 memset(os->buf + os->bufpos, 0, FF_INPUT_BUFFER_PADDING_SIZE);
335 static int ogg_packet(AVFormatContext *s, int *str, int *dstart, int *dsize,
338 struct ogg *ogg = s->priv_data;
340 struct ogg_stream *os;
342 int segp = 0, psize = 0;
344 av_dlog(s, "ogg_packet: curidx=%i\n", ogg->curidx);
350 ret = ogg_read_page(s, &idx);
355 os = ogg->streams + idx;
357 av_dlog(s, "ogg_packet: idx=%d pstart=%d psize=%d segp=%d nsegs=%d\n",
358 idx, os->pstart, os->psize, os->segp, os->nsegs);
361 if (os->header < 0) {
362 os->codec = ogg_find_codec(os->buf, os->bufpos);
364 av_log(s, AV_LOG_WARNING, "Codec not found\n");
376 while (os->segp < os->nsegs) {
377 int ss = os->segments[os->segp++];
385 if (!complete && os->segp == os->nsegs) {
391 av_dlog(s, "ogg_packet: idx %i, frame size %i, start %i\n",
392 idx, os->psize, os->pstart);
394 if (os->granule == -1)
395 av_log(s, AV_LOG_WARNING,
396 "Page at %"PRId64" is missing granule\n",
403 os->header = os->codec->header(s, idx);
408 // We have reached the first non-header packet in this stream.
409 // Unfortunately more header packets may still follow for others,
410 // but if we continue with header parsing we may lose data packets.
413 // Update the header state for all streams and
414 // compute the data_offset.
416 s->data_offset = os->sync_pos;
418 for (i = 0; i < ogg->nstreams; i++) {
419 struct ogg_stream *cur_os = ogg->streams + i;
421 // if we have a partial non-header packet, its start is
422 // obviously at or after the data start
423 if (cur_os->incomplete)
424 s->data_offset = FFMIN(s->data_offset, cur_os->sync_pos);
428 os->pstart += os->psize;
434 if (os->codec && os->codec->packet)
435 os->codec->packet(s, idx);
439 *dstart = os->pstart;
443 *fpos = os->sync_pos;
444 os->pstart += os->psize;
446 os->sync_pos = os->page_pos;
449 // determine whether there are more complete packets in this page
450 // if not, the page's granule will apply to this packet
452 for (i = os->segp; i < os->nsegs; i++)
453 if (os->segments[i] < 255) {
458 if (os->segp == os->nsegs)
464 static int ogg_get_headers(AVFormatContext *s)
466 struct ogg *ogg = s->priv_data;
470 ret = ogg_packet(s, NULL, NULL, NULL, NULL);
473 } while (!ogg->headers);
475 for (i = 0; i < ogg->nstreams; i++) {
476 struct ogg_stream *os = ogg->streams + i;
478 if (os->codec && os->codec->nb_header &&
479 os->nb_header < os->codec->nb_header) {
480 av_log(s, AV_LOG_ERROR,
481 "Headers mismatch for stream %d\n", i);
482 return AVERROR_INVALIDDATA;
484 if (os->start_granule != OGG_NOGRANULE_VALUE)
485 os->lastpts = s->streams[i]->start_time =
486 ogg_gptopts(s, i, os->start_granule, NULL);
488 av_dlog(s, "found headers\n");
493 static int ogg_get_length(AVFormatContext *s)
495 struct ogg *ogg = s->priv_data;
499 if (!s->pb->seekable)
503 if (s->duration != AV_NOPTS_VALUE)
506 size = avio_size(s->pb);
509 end = size > MAX_PAGE_SIZE ? size - MAX_PAGE_SIZE : 0;
512 avio_seek(s->pb, end, SEEK_SET);
514 while (!ogg_read_page(s, &i)) {
515 if (ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0 &&
516 ogg->streams[i].codec) {
517 s->streams[i]->duration =
518 ogg_gptopts(s, i, ogg->streams[i].granule, NULL);
519 if (s->streams[i]->start_time != AV_NOPTS_VALUE)
520 s->streams[i]->duration -= s->streams[i]->start_time;
529 static int ogg_read_close(AVFormatContext *s)
531 struct ogg *ogg = s->priv_data;
534 for (i = 0; i < ogg->nstreams; i++) {
535 av_free(ogg->streams[i].buf);
536 if (ogg->streams[i].codec &&
537 ogg->streams[i].codec->cleanup) {
538 ogg->streams[i].codec->cleanup(s, i);
540 av_free(ogg->streams[i].private);
542 av_free(ogg->streams);
546 static int ogg_read_header(AVFormatContext *s)
548 struct ogg *ogg = s->priv_data;
551 //linear headers seek from start
552 ret = ogg_get_headers(s);
558 for (i = 0; i < ogg->nstreams; i++)
559 if (ogg->streams[i].header < 0)
560 ogg->streams[i].codec = NULL;
562 //linear granulepos seek from end
565 //fill the extradata in the per codec callbacks
569 static int64_t ogg_calc_pts(AVFormatContext *s, int idx, int64_t *dts)
571 struct ogg *ogg = s->priv_data;
572 struct ogg_stream *os = ogg->streams + idx;
573 int64_t pts = AV_NOPTS_VALUE;
576 *dts = AV_NOPTS_VALUE;
578 if (os->lastpts != AV_NOPTS_VALUE) {
580 os->lastpts = AV_NOPTS_VALUE;
582 if (os->lastdts != AV_NOPTS_VALUE) {
585 os->lastdts = AV_NOPTS_VALUE;
588 if (os->granule != -1LL) {
589 if (os->codec && os->codec->granule_is_start)
590 pts = ogg_gptopts(s, idx, os->granule, dts);
592 os->lastpts = ogg_gptopts(s, idx, os->granule, &os->lastdts);
599 static int ogg_read_packet(AVFormatContext *s, AVPacket *pkt)
602 struct ogg_stream *os;
605 int64_t fpos, pts, dts;
610 ret = ogg_packet(s, &idx, &pstart, &psize, &fpos);
613 } while (idx < 0 || !s->streams[idx]);
616 os = ogg->streams + idx;
618 // pflags might not be set until after this
619 pts = ogg_calc_pts(s, idx, &dts);
621 if (os->keyframe_seek && !(os->pflags & AV_PKT_FLAG_KEY))
623 os->keyframe_seek = 0;
626 ret = av_new_packet(pkt, psize);
629 pkt->stream_index = idx;
630 memcpy(pkt->data, os->buf + pstart, psize);
634 pkt->flags = os->pflags;
635 pkt->duration = os->pduration;
641 static int64_t ogg_read_timestamp(AVFormatContext *s, int stream_index,
642 int64_t *pos_arg, int64_t pos_limit)
644 struct ogg *ogg = s->priv_data;
645 AVIOContext *bc = s->pb;
646 int64_t pts = AV_NOPTS_VALUE;
648 avio_seek(bc, *pos_arg, SEEK_SET);
651 while (avio_tell(bc) < pos_limit &&
652 !ogg_packet(s, &i, NULL, NULL, pos_arg)) {
653 if (i == stream_index) {
654 struct ogg_stream *os = ogg->streams + stream_index;
655 pts = ogg_calc_pts(s, i, NULL);
656 if (os->keyframe_seek && !(os->pflags & AV_PKT_FLAG_KEY))
657 pts = AV_NOPTS_VALUE;
659 if (pts != AV_NOPTS_VALUE)
666 static int ogg_read_seek(AVFormatContext *s, int stream_index,
667 int64_t timestamp, int flags)
669 struct ogg *ogg = s->priv_data;
670 struct ogg_stream *os = ogg->streams + stream_index;
673 // Try seeking to a keyframe first. If this fails (very possible),
674 // av_seek_frame will fall back to ignoring keyframes
675 if (s->streams[stream_index]->codec->codec_type == AVMEDIA_TYPE_VIDEO
676 && !(flags & AVSEEK_FLAG_ANY))
677 os->keyframe_seek = 1;
679 ret = ff_seek_frame_binary(s, stream_index, timestamp, flags);
680 os = ogg->streams + stream_index;
682 os->keyframe_seek = 0;
686 static int ogg_probe(AVProbeData *p)
688 if (!memcmp("OggS", p->buf, 5) && p->buf[5] <= 0x7)
689 return AVPROBE_SCORE_MAX;
693 AVInputFormat ff_ogg_demuxer = {
695 .long_name = NULL_IF_CONFIG_SMALL("Ogg"),
696 .priv_data_size = sizeof(struct ogg),
697 .read_probe = ogg_probe,
698 .read_header = ogg_read_header,
699 .read_packet = ogg_read_packet,
700 .read_close = ogg_read_close,
701 .read_seek = ogg_read_seek,
702 .read_timestamp = ogg_read_timestamp,
704 .flags = AVFMT_GENERIC_INDEX,