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
59 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 = url_ftell (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);
84 ogg_restore (AVFormatContext * s, int discard)
86 struct ogg *ogg = s->priv_data;
87 ByteIOContext *bc = s->pb;
88 struct ogg_state *ost = ogg->state;
94 ogg->state = ost->next;
97 for (i = 0; i < ogg->nstreams; i++)
98 av_free (ogg->streams[i].buf);
100 url_fseek (bc, ost->pos, SEEK_SET);
101 ogg->curidx = ost->curidx;
102 ogg->nstreams = ost->nstreams;
103 memcpy(ogg->streams, ost->streams,
104 ost->nstreams * sizeof(*ogg->streams));
113 ogg_reset (struct ogg * ogg)
117 for (i = 0; i < ogg->nstreams; i++){
118 struct ogg_stream *os = ogg->streams + i;
123 os->lastpts = AV_NOPTS_VALUE;
124 os->lastdts = AV_NOPTS_VALUE;
137 static const struct ogg_codec *
138 ogg_find_codec (uint8_t * buf, int size)
142 for (i = 0; ogg_codecs[i]; i++)
143 if (size >= ogg_codecs[i]->magicsize &&
144 !memcmp (buf, ogg_codecs[i]->magic, ogg_codecs[i]->magicsize))
145 return ogg_codecs[i];
151 ogg_new_stream (AVFormatContext * s, uint32_t serial)
154 struct ogg *ogg = s->priv_data;
155 int idx = ogg->nstreams++;
157 struct ogg_stream *os;
159 ogg->streams = av_realloc (ogg->streams,
160 ogg->nstreams * sizeof (*ogg->streams));
161 memset (ogg->streams + idx, 0, sizeof (*ogg->streams));
162 os = ogg->streams + idx;
164 os->bufsize = DECODER_BUFFER_SIZE;
165 os->buf = av_malloc(os->bufsize);
168 st = av_new_stream (s, idx);
170 return AVERROR(ENOMEM);
172 av_set_pts_info(st, 64, 1, 1000000);
178 ogg_new_buf(struct ogg *ogg, int idx)
180 struct ogg_stream *os = ogg->streams + idx;
181 uint8_t *nb = av_malloc(os->bufsize);
182 int size = os->bufpos - os->pstart;
184 memcpy(nb, os->buf + os->pstart, size);
195 ogg_read_page (AVFormatContext * s, int *str)
197 ByteIOContext *bc = s->pb;
198 struct ogg *ogg = s->priv_data;
199 struct ogg_stream *os;
210 if (get_buffer (bc, sync, 4) < 4)
216 if (sync[sp & 3] == 'O' &&
217 sync[(sp + 1) & 3] == 'g' &&
218 sync[(sp + 2) & 3] == 'g' && sync[(sp + 3) & 3] == 'S')
225 }while (i++ < MAX_PAGE_SIZE);
227 if (i >= MAX_PAGE_SIZE){
228 av_log (s, AV_LOG_INFO, "ogg, can't find sync word\n");
232 if (url_fgetc (bc) != 0) /* version */
235 flags = url_fgetc (bc);
237 serial = get_le32 (bc);
240 nsegs = url_fgetc (bc);
242 idx = ogg_find_stream (ogg, serial);
244 idx = ogg_new_stream (s, serial);
249 os = ogg->streams + idx;
250 os->page_pos = url_ftell(bc) - 27;
253 ogg_new_buf(ogg, idx);
255 if (get_buffer (bc, os->segments, nsegs) < nsegs)
262 for (i = 0; i < nsegs; i++)
263 size += os->segments[i];
265 if (flags & OGG_FLAG_CONT || os->incomplete){
267 while (os->segp < os->nsegs){
268 int seg = os->segments[os->segp++];
273 os->sync_pos = os->page_pos;
277 os->sync_pos = os->page_pos;
280 if (os->bufsize - os->bufpos < size){
281 uint8_t *nb = av_malloc (os->bufsize *= 2);
282 memcpy (nb, os->buf, os->bufpos);
287 if (get_buffer (bc, os->buf + os->bufpos, size) < size)
301 ogg_packet (AVFormatContext * s, int *str, int *dstart, int *dsize, int64_t *fpos)
303 struct ogg *ogg = s->priv_data;
305 struct ogg_stream *os;
307 int segp = 0, psize = 0;
310 av_log (s, AV_LOG_DEBUG, "ogg_packet: curidx=%i\n", ogg->curidx);
317 if (ogg_read_page (s, &idx) < 0)
321 os = ogg->streams + idx;
324 av_log (s, AV_LOG_DEBUG,
325 "ogg_packet: idx=%d pstart=%d psize=%d segp=%d nsegs=%d\n",
326 idx, os->pstart, os->psize, os->segp, os->nsegs);
331 os->codec = ogg_find_codec (os->buf, os->bufpos);
344 while (os->segp < os->nsegs){
345 int ss = os->segments[os->segp++];
353 if (!complete && os->segp == os->nsegs){
360 av_log (s, AV_LOG_DEBUG,
361 "ogg_packet: idx %i, frame size %i, start %i\n",
362 idx, os->psize, os->pstart);
369 os->header = os->codec->header (s, idx);
374 s->data_offset = os->sync_pos;
377 os->pstart += os->psize;
383 if (os->codec && os->codec->packet)
384 os->codec->packet (s, idx);
388 *dstart = os->pstart;
392 *fpos = os->sync_pos;
393 os->pstart += os->psize;
395 os->sync_pos = os->page_pos;
398 // determine whether there are more complete packets in this page
399 // if not, the page's granule will apply to this packet
401 for (i = os->segp; i < os->nsegs; i++)
402 if (os->segments[i] < 255) {
407 if (os->segp == os->nsegs)
414 ogg_get_headers (AVFormatContext * s)
416 struct ogg *ogg = s->priv_data;
419 if (ogg_packet (s, NULL, NULL, NULL, NULL) < 0)
421 }while (!ogg->headers);
424 av_log (s, AV_LOG_DEBUG, "found headers\n");
431 ogg_get_length (AVFormatContext * s)
433 struct ogg *ogg = s->priv_data;
437 if(url_is_streamed(s->pb))
441 if (s->duration != AV_NOPTS_VALUE)
444 size = url_fsize(s->pb);
447 end = size > MAX_PAGE_SIZE? size - MAX_PAGE_SIZE: 0;
450 url_fseek (s->pb, end, SEEK_SET);
452 while (!ogg_read_page (s, &i)){
453 if (ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0 &&
454 ogg->streams[i].codec)
459 s->streams[idx]->duration =
460 ogg_gptopts (s, idx, ogg->streams[idx].granule, NULL);
461 if (s->streams[idx]->start_time != AV_NOPTS_VALUE)
462 s->streams[idx]->duration -= s->streams[idx]->start_time;
473 ogg_read_header (AVFormatContext * s, AVFormatParameters * ap)
475 struct ogg *ogg = s->priv_data;
478 //linear headers seek from start
479 if (ogg_get_headers (s) < 0){
483 for (i = 0; i < ogg->nstreams; i++)
484 if (ogg->streams[i].header < 0)
485 ogg->streams[i].codec = NULL;
487 //linear granulepos seek from end
490 //fill the extradata in the per codec callbacks
494 static int64_t ogg_calc_pts(AVFormatContext *s, int idx, int64_t *dts)
496 struct ogg *ogg = s->priv_data;
497 struct ogg_stream *os = ogg->streams + idx;
498 int64_t pts = AV_NOPTS_VALUE;
501 *dts = AV_NOPTS_VALUE;
503 if (os->lastpts != AV_NOPTS_VALUE) {
505 os->lastpts = AV_NOPTS_VALUE;
507 if (os->lastdts != AV_NOPTS_VALUE) {
510 os->lastdts = AV_NOPTS_VALUE;
513 if (os->granule != -1LL) {
514 if (os->codec && os->codec->granule_is_start)
515 pts = ogg_gptopts(s, idx, os->granule, dts);
517 os->lastpts = ogg_gptopts(s, idx, os->granule, &os->lastdts);
520 av_log(s, AV_LOG_WARNING, "Packet is missing granule\n");
526 ogg_read_packet (AVFormatContext * s, AVPacket * pkt)
529 struct ogg_stream *os;
532 int64_t fpos, pts, dts;
537 if (ogg_packet (s, &idx, &pstart, &psize, &fpos) < 0)
539 }while (idx < 0 || !s->streams[idx]);
542 os = ogg->streams + idx;
544 // pflags might not be set until after this
545 pts = ogg_calc_pts(s, idx, &dts);
547 if (os->keyframe_seek && !(os->pflags & PKT_FLAG_KEY))
549 os->keyframe_seek = 0;
552 if (av_new_packet (pkt, psize) < 0)
554 pkt->stream_index = idx;
555 memcpy (pkt->data, os->buf + pstart, psize);
559 pkt->flags = os->pflags;
560 pkt->duration = os->pduration;
568 ogg_read_close (AVFormatContext * s)
570 struct ogg *ogg = s->priv_data;
573 for (i = 0; i < ogg->nstreams; i++){
574 av_free (ogg->streams[i].buf);
575 av_free (ogg->streams[i].private);
577 av_free (ogg->streams);
583 ogg_read_timestamp (AVFormatContext * s, int stream_index, int64_t * pos_arg,
586 struct ogg *ogg = s->priv_data;
587 struct ogg_stream *os = ogg->streams + stream_index;
588 ByteIOContext *bc = s->pb;
589 int64_t pts = AV_NOPTS_VALUE;
591 url_fseek(bc, *pos_arg, SEEK_SET);
594 while (url_ftell(bc) < pos_limit && !ogg_packet(s, &i, NULL, NULL, pos_arg)) {
595 if (i == stream_index) {
596 pts = ogg_calc_pts(s, i, NULL);
597 if (os->keyframe_seek && !(os->pflags & PKT_FLAG_KEY))
598 pts = AV_NOPTS_VALUE;
600 if (pts != AV_NOPTS_VALUE)
607 static int ogg_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
609 struct ogg *ogg = s->priv_data;
610 struct ogg_stream *os = ogg->streams + stream_index;
613 // Try seeking to a keyframe first. If this fails (very possible),
614 // av_seek_frame will fall back to ignoring keyframes
615 if (s->streams[stream_index]->codec->codec_type == CODEC_TYPE_VIDEO
616 && !(flags & AVSEEK_FLAG_ANY))
617 os->keyframe_seek = 1;
619 ret = av_seek_frame_binary(s, stream_index, timestamp, flags);
621 os->keyframe_seek = 0;
625 static int ogg_probe(AVProbeData *p)
627 if (p->buf[0] == 'O' && p->buf[1] == 'g' &&
628 p->buf[2] == 'g' && p->buf[3] == 'S' &&
629 p->buf[4] == 0x0 && p->buf[5] <= 0x7 )
630 return AVPROBE_SCORE_MAX;
635 AVInputFormat ogg_demuxer = {
637 NULL_IF_CONFIG_SMALL("Ogg"),
646 .metadata_conv = ff_vorbiscomment_metadata_conv,