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: "
482 "expected %d received %d.\n",
483 i, os->codec->nb_header, os->nb_header);
484 if (s->error_recognition & AV_EF_EXPLODE)
485 return AVERROR_INVALIDDATA;
487 if (os->start_granule != OGG_NOGRANULE_VALUE)
488 os->lastpts = s->streams[i]->start_time =
489 ogg_gptopts(s, i, os->start_granule, NULL);
491 av_dlog(s, "found headers\n");
496 static int ogg_get_length(AVFormatContext *s)
498 struct ogg *ogg = s->priv_data;
502 if (!s->pb->seekable)
506 if (s->duration != AV_NOPTS_VALUE)
509 size = avio_size(s->pb);
512 end = size > MAX_PAGE_SIZE ? size - MAX_PAGE_SIZE : 0;
515 avio_seek(s->pb, end, SEEK_SET);
517 while (!ogg_read_page(s, &i)) {
518 if (ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0 &&
519 ogg->streams[i].codec) {
520 s->streams[i]->duration =
521 ogg_gptopts(s, i, ogg->streams[i].granule, NULL);
522 if (s->streams[i]->start_time != AV_NOPTS_VALUE)
523 s->streams[i]->duration -= s->streams[i]->start_time;
532 static int ogg_read_close(AVFormatContext *s)
534 struct ogg *ogg = s->priv_data;
537 for (i = 0; i < ogg->nstreams; i++) {
538 av_free(ogg->streams[i].buf);
539 if (ogg->streams[i].codec &&
540 ogg->streams[i].codec->cleanup) {
541 ogg->streams[i].codec->cleanup(s, i);
543 av_free(ogg->streams[i].private);
545 av_free(ogg->streams);
549 static int ogg_read_header(AVFormatContext *s)
551 struct ogg *ogg = s->priv_data;
554 //linear headers seek from start
555 ret = ogg_get_headers(s);
561 for (i = 0; i < ogg->nstreams; i++)
562 if (ogg->streams[i].header < 0)
563 ogg->streams[i].codec = NULL;
565 //linear granulepos seek from end
568 //fill the extradata in the per codec callbacks
572 static int64_t ogg_calc_pts(AVFormatContext *s, int idx, int64_t *dts)
574 struct ogg *ogg = s->priv_data;
575 struct ogg_stream *os = ogg->streams + idx;
576 int64_t pts = AV_NOPTS_VALUE;
579 *dts = AV_NOPTS_VALUE;
581 if (os->lastpts != AV_NOPTS_VALUE) {
583 os->lastpts = AV_NOPTS_VALUE;
585 if (os->lastdts != AV_NOPTS_VALUE) {
588 os->lastdts = AV_NOPTS_VALUE;
591 if (os->granule != -1LL) {
592 if (os->codec && os->codec->granule_is_start)
593 pts = ogg_gptopts(s, idx, os->granule, dts);
595 os->lastpts = ogg_gptopts(s, idx, os->granule, &os->lastdts);
602 static int ogg_read_packet(AVFormatContext *s, AVPacket *pkt)
605 struct ogg_stream *os;
608 int64_t fpos, pts, dts;
613 ret = ogg_packet(s, &idx, &pstart, &psize, &fpos);
616 } while (idx < 0 || !s->streams[idx]);
619 os = ogg->streams + idx;
621 // pflags might not be set until after this
622 pts = ogg_calc_pts(s, idx, &dts);
624 if (os->keyframe_seek && !(os->pflags & AV_PKT_FLAG_KEY))
626 os->keyframe_seek = 0;
629 ret = av_new_packet(pkt, psize);
632 pkt->stream_index = idx;
633 memcpy(pkt->data, os->buf + pstart, psize);
637 pkt->flags = os->pflags;
638 pkt->duration = os->pduration;
644 static int64_t ogg_read_timestamp(AVFormatContext *s, int stream_index,
645 int64_t *pos_arg, int64_t pos_limit)
647 struct ogg *ogg = s->priv_data;
648 AVIOContext *bc = s->pb;
649 int64_t pts = AV_NOPTS_VALUE;
651 avio_seek(bc, *pos_arg, SEEK_SET);
654 while (avio_tell(bc) < pos_limit &&
655 !ogg_packet(s, &i, NULL, NULL, pos_arg)) {
656 if (i == stream_index) {
657 struct ogg_stream *os = ogg->streams + stream_index;
658 pts = ogg_calc_pts(s, i, NULL);
659 if (os->keyframe_seek && !(os->pflags & AV_PKT_FLAG_KEY))
660 pts = AV_NOPTS_VALUE;
662 if (pts != AV_NOPTS_VALUE)
669 static int ogg_read_seek(AVFormatContext *s, int stream_index,
670 int64_t timestamp, int flags)
672 struct ogg *ogg = s->priv_data;
673 struct ogg_stream *os = ogg->streams + stream_index;
676 // Try seeking to a keyframe first. If this fails (very possible),
677 // av_seek_frame will fall back to ignoring keyframes
678 if (s->streams[stream_index]->codec->codec_type == AVMEDIA_TYPE_VIDEO
679 && !(flags & AVSEEK_FLAG_ANY))
680 os->keyframe_seek = 1;
682 ret = ff_seek_frame_binary(s, stream_index, timestamp, flags);
683 os = ogg->streams + stream_index;
685 os->keyframe_seek = 0;
689 static int ogg_probe(AVProbeData *p)
691 if (!memcmp("OggS", p->buf, 5) && p->buf[5] <= 0x7)
692 return AVPROBE_SCORE_MAX;
696 AVInputFormat ff_ogg_demuxer = {
698 .long_name = NULL_IF_CONFIG_SMALL("Ogg"),
699 .priv_data_size = sizeof(struct ogg),
700 .read_probe = ogg_probe,
701 .read_header = ogg_read_header,
702 .read_packet = ogg_read_packet,
703 .read_close = ogg_read_close,
704 .read_seek = ogg_read_seek,
705 .read_timestamp = ogg_read_timestamp,
707 .flags = AVFMT_GENERIC_INDEX | AVFMT_NOBINSEARCH,