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[] = {
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_malloc (os->bufsize);
74 memset (os->buf, 0, os->bufsize);
75 memcpy (os->buf, ost->streams[i].buf, os->bufpos);
83 static int ogg_restore(AVFormatContext *s, int discard)
85 struct ogg *ogg = s->priv_data;
86 AVIOContext *bc = s->pb;
87 struct ogg_state *ost = ogg->state;
93 ogg->state = ost->next;
96 for (i = 0; i < ogg->nstreams; i++)
97 av_free (ogg->streams[i].buf);
99 avio_seek (bc, ost->pos, SEEK_SET);
100 ogg->curidx = ost->curidx;
101 ogg->nstreams = ost->nstreams;
102 memcpy(ogg->streams, ost->streams,
103 ost->nstreams * sizeof(*ogg->streams));
111 static int ogg_reset(struct ogg *ogg)
115 for (i = 0; i < ogg->nstreams; i++){
116 struct ogg_stream *os = ogg->streams + i;
121 os->lastpts = AV_NOPTS_VALUE;
122 os->lastdts = AV_NOPTS_VALUE;
135 static const struct ogg_codec *ogg_find_codec(uint8_t *buf, int size)
139 for (i = 0; ogg_codecs[i]; i++)
140 if (size >= ogg_codecs[i]->magicsize &&
141 !memcmp (buf, ogg_codecs[i]->magic, ogg_codecs[i]->magicsize))
142 return ogg_codecs[i];
147 static int ogg_new_stream(AVFormatContext *s, uint32_t serial, int new_avstream)
150 struct ogg *ogg = s->priv_data;
151 int idx = ogg->nstreams++;
153 struct ogg_stream *os;
155 ogg->streams = av_realloc (ogg->streams,
156 ogg->nstreams * sizeof (*ogg->streams));
157 memset (ogg->streams + idx, 0, sizeof (*ogg->streams));
158 os = ogg->streams + idx;
160 os->bufsize = DECODER_BUFFER_SIZE;
161 os->buf = av_malloc(os->bufsize);
165 st = av_new_stream(s, idx);
167 return AVERROR(ENOMEM);
169 av_set_pts_info(st, 64, 1, 1000000);
175 static int ogg_new_buf(struct ogg *ogg, int idx)
177 struct ogg_stream *os = ogg->streams + idx;
178 uint8_t *nb = av_malloc(os->bufsize);
179 int size = os->bufpos - os->pstart;
181 memcpy(nb, os->buf + os->pstart, size);
191 static int ogg_read_page(AVFormatContext *s, int *str)
193 AVIOContext *bc = s->pb;
194 struct ogg *ogg = s->priv_data;
195 struct ogg_stream *os;
204 ret = avio_read (bc, sync, 4);
206 return ret < 0 ? ret : AVERROR_EOF;
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");
224 return AVERROR_INVALIDDATA;
227 if (avio_r8(bc) != 0) /* version */
228 return AVERROR_INVALIDDATA;
232 serial = avio_rl32 (bc);
233 avio_skip(bc, 8); /* seq, crc */
236 idx = ogg_find_stream (ogg, serial);
241 for (n = 0; n < ogg->nstreams; n++) {
242 av_freep(&ogg->streams[n].buf);
243 if (!ogg->state || ogg->state->streams[n].private != ogg->streams[n].private)
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 ret = avio_read (bc, os->segments, nsegs);
264 return ret < 0 ? ret : AVERROR_EOF;
270 for (i = 0; i < nsegs; i++)
271 size += os->segments[i];
273 if (flags & OGG_FLAG_CONT || os->incomplete){
275 while (os->segp < os->nsegs){
276 int seg = os->segments[os->segp++];
281 os->sync_pos = os->page_pos;
285 os->sync_pos = os->page_pos;
288 if (os->bufsize - os->bufpos < size){
289 uint8_t *nb = av_malloc (os->bufsize *= 2);
290 memcpy (nb, os->buf, os->bufpos);
295 ret = avio_read (bc, os->buf + os->bufpos, size);
297 return ret < 0 ? ret : AVERROR_EOF;
309 static int ogg_packet(AVFormatContext *s, int *str, int *dstart, int *dsize,
312 struct ogg *ogg = s->priv_data;
314 struct ogg_stream *os;
316 int segp = 0, psize = 0;
318 av_dlog(s, "ogg_packet: curidx=%i\n", ogg->curidx);
324 ret = ogg_read_page (s, &idx);
329 os = ogg->streams + idx;
331 av_dlog(s, "ogg_packet: idx=%d pstart=%d psize=%d segp=%d nsegs=%d\n",
332 idx, os->pstart, os->psize, os->segp, os->nsegs);
336 os->codec = ogg_find_codec (os->buf, os->bufpos);
338 av_log(s, AV_LOG_WARNING, "Codec not found\n");
350 while (os->segp < os->nsegs){
351 int ss = os->segments[os->segp++];
359 if (!complete && os->segp == os->nsegs){
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 // but if we continue with header parsing we may lose data packets.
383 // Update the header state for all streams and
384 // compute the data_offset.
386 s->data_offset = os->sync_pos;
387 for (i = 0; i < ogg->nstreams; i++) {
388 struct ogg_stream *cur_os = ogg->streams + i;
390 // if we have a partial non-header packet, its start is
391 // obviously at or after the data start
392 if (cur_os->incomplete)
393 s->data_offset = FFMIN(s->data_offset, cur_os->sync_pos);
396 os->pstart += os->psize;
402 if (os->codec && os->codec->packet)
403 os->codec->packet (s, idx);
407 *dstart = os->pstart;
411 *fpos = os->sync_pos;
412 os->pstart += os->psize;
414 if(os->pstart == os->bufpos)
415 os->bufpos = os->pstart = 0;
416 os->sync_pos = os->page_pos;
419 // determine whether there are more complete packets in this page
420 // if not, the page's granule will apply to this packet
422 for (i = os->segp; i < os->nsegs; i++)
423 if (os->segments[i] < 255) {
428 if (os->segp == os->nsegs)
434 static int ogg_get_headers(AVFormatContext *s)
436 struct ogg *ogg = s->priv_data;
440 ret = ogg_packet (s, NULL, NULL, NULL, NULL);
443 }while (!ogg->headers);
445 av_dlog(s, "found headers\n");
450 static int ogg_get_length(AVFormatContext *s)
452 struct ogg *ogg = s->priv_data;
460 if (s->duration != AV_NOPTS_VALUE)
463 size = avio_size(s->pb);
466 end = size > MAX_PAGE_SIZE? size - MAX_PAGE_SIZE: 0;
469 avio_seek (s->pb, end, SEEK_SET);
471 while (!ogg_read_page (s, &i)){
472 if (ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0 &&
473 ogg->streams[i].codec) {
474 s->streams[i]->duration =
475 ogg_gptopts (s, i, ogg->streams[i].granule, NULL);
476 if (s->streams[i]->start_time != AV_NOPTS_VALUE)
477 s->streams[i]->duration -= s->streams[i]->start_time;
484 avio_seek (s->pb, 0, SEEK_SET);
485 while (!ogg_read_page (s, &i)){
486 if (ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0 &&
487 ogg->streams[i].codec) {
488 s->streams[i]->duration -=
489 ogg_gptopts (s, i, ogg->streams[i].granule, NULL);
498 static int ogg_read_header(AVFormatContext *s, AVFormatParameters *ap)
500 struct ogg *ogg = s->priv_data;
503 //linear headers seek from start
504 ret = ogg_get_headers (s);
509 for (i = 0; i < ogg->nstreams; i++)
510 if (ogg->streams[i].header < 0)
511 ogg->streams[i].codec = NULL;
513 //linear granulepos seek from end
516 //fill the extradata in the per codec callbacks
520 static int64_t ogg_calc_pts(AVFormatContext *s, int idx, int64_t *dts)
522 struct ogg *ogg = s->priv_data;
523 struct ogg_stream *os = ogg->streams + idx;
524 int64_t pts = AV_NOPTS_VALUE;
527 *dts = AV_NOPTS_VALUE;
529 if (os->lastpts != AV_NOPTS_VALUE) {
531 os->lastpts = AV_NOPTS_VALUE;
533 if (os->lastdts != AV_NOPTS_VALUE) {
536 os->lastdts = AV_NOPTS_VALUE;
539 if (os->granule != -1LL) {
540 if (os->codec && os->codec->granule_is_start)
541 pts = ogg_gptopts(s, idx, os->granule, dts);
543 os->lastpts = ogg_gptopts(s, idx, os->granule, &os->lastdts);
550 static int ogg_read_packet(AVFormatContext *s, AVPacket *pkt)
553 struct ogg_stream *os;
556 int64_t fpos, pts, dts;
561 ret = ogg_packet (s, &idx, &pstart, &psize, &fpos);
564 }while (idx < 0 || !s->streams[idx]);
567 os = ogg->streams + idx;
569 // pflags might not be set until after this
570 pts = ogg_calc_pts(s, idx, &dts);
572 if (os->keyframe_seek && !(os->pflags & AV_PKT_FLAG_KEY))
574 os->keyframe_seek = 0;
577 ret = av_new_packet (pkt, psize);
580 pkt->stream_index = idx;
581 memcpy (pkt->data, os->buf + pstart, psize);
585 pkt->flags = os->pflags;
586 pkt->duration = os->pduration;
592 static int ogg_read_close(AVFormatContext *s)
594 struct ogg *ogg = s->priv_data;
597 for (i = 0; i < ogg->nstreams; i++){
598 av_free (ogg->streams[i].buf);
599 av_free (ogg->streams[i].private);
601 av_free (ogg->streams);
605 static int64_t ogg_read_timestamp(AVFormatContext *s, int stream_index,
606 int64_t *pos_arg, int64_t pos_limit)
608 struct ogg *ogg = s->priv_data;
609 struct ogg_stream *os = ogg->streams + stream_index;
610 AVIOContext *bc = s->pb;
611 int64_t pts = AV_NOPTS_VALUE;
613 avio_seek(bc, *pos_arg, SEEK_SET);
616 while (avio_tell(bc) < pos_limit && !ogg_packet(s, &i, NULL, NULL, pos_arg)) {
617 if (i == stream_index) {
618 pts = ogg_calc_pts(s, i, NULL);
619 if (os->keyframe_seek && !(os->pflags & AV_PKT_FLAG_KEY))
620 pts = AV_NOPTS_VALUE;
622 if (pts != AV_NOPTS_VALUE)
629 static int ogg_read_seek(AVFormatContext *s, int stream_index,
630 int64_t timestamp, int flags)
632 struct ogg *ogg = s->priv_data;
633 struct ogg_stream *os = ogg->streams + stream_index;
636 // Try seeking to a keyframe first. If this fails (very possible),
637 // av_seek_frame will fall back to ignoring keyframes
638 if (s->streams[stream_index]->codec->codec_type == AVMEDIA_TYPE_VIDEO
639 && !(flags & AVSEEK_FLAG_ANY))
640 os->keyframe_seek = 1;
642 ret = av_seek_frame_binary(s, stream_index, timestamp, flags);
644 os->keyframe_seek = 0;
648 static int ogg_probe(AVProbeData *p)
650 if (!memcmp("OggS", p->buf, 5) && p->buf[5] <= 0x7)
651 return AVPROBE_SCORE_MAX;
655 AVInputFormat ff_ogg_demuxer = {
657 .long_name = NULL_IF_CONFIG_SMALL("Ogg"),
658 .priv_data_size = sizeof(struct ogg),
659 .read_probe = ogg_probe,
660 .read_header = ogg_read_header,
661 .read_packet = ogg_read_packet,
662 .read_close = ogg_read_close,
663 .read_seek = ogg_read_seek,
664 .read_timestamp = ogg_read_timestamp,
666 .flags = AVFMT_GENERIC_INDEX,