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);
365 if (os->granule == -1)
366 av_log(s, AV_LOG_WARNING, "Page at %lld is missing granule\n", os->page_pos);
372 os->header = os->codec->header (s, idx);
377 s->data_offset = os->sync_pos;
380 os->pstart += os->psize;
386 if (os->codec && os->codec->packet)
387 os->codec->packet (s, idx);
391 *dstart = os->pstart;
395 *fpos = os->sync_pos;
396 os->pstart += os->psize;
398 os->sync_pos = os->page_pos;
401 // determine whether there are more complete packets in this page
402 // if not, the page's granule will apply to this packet
404 for (i = os->segp; i < os->nsegs; i++)
405 if (os->segments[i] < 255) {
410 if (os->segp == os->nsegs)
417 ogg_get_headers (AVFormatContext * s)
419 struct ogg *ogg = s->priv_data;
422 if (ogg_packet (s, NULL, NULL, NULL, NULL) < 0)
424 }while (!ogg->headers);
427 av_log (s, AV_LOG_DEBUG, "found headers\n");
434 ogg_get_length (AVFormatContext * s)
436 struct ogg *ogg = s->priv_data;
440 if(url_is_streamed(s->pb))
444 if (s->duration != AV_NOPTS_VALUE)
447 size = url_fsize(s->pb);
450 end = size > MAX_PAGE_SIZE? size - MAX_PAGE_SIZE: 0;
453 url_fseek (s->pb, end, SEEK_SET);
455 while (!ogg_read_page (s, &i)){
456 if (ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0 &&
457 ogg->streams[i].codec) {
458 s->streams[i]->duration =
459 ogg_gptopts (s, i, ogg->streams[i].granule, NULL);
460 if (s->streams[i]->start_time != AV_NOPTS_VALUE)
461 s->streams[i]->duration -= s->streams[i]->start_time;
472 ogg_read_header (AVFormatContext * s, AVFormatParameters * ap)
474 struct ogg *ogg = s->priv_data;
477 //linear headers seek from start
478 if (ogg_get_headers (s) < 0){
482 for (i = 0; i < ogg->nstreams; i++)
483 if (ogg->streams[i].header < 0)
484 ogg->streams[i].codec = NULL;
486 //linear granulepos seek from end
489 //fill the extradata in the per codec callbacks
493 static int64_t ogg_calc_pts(AVFormatContext *s, int idx, int64_t *dts)
495 struct ogg *ogg = s->priv_data;
496 struct ogg_stream *os = ogg->streams + idx;
497 int64_t pts = AV_NOPTS_VALUE;
500 *dts = AV_NOPTS_VALUE;
502 if (os->lastpts != AV_NOPTS_VALUE) {
504 os->lastpts = AV_NOPTS_VALUE;
506 if (os->lastdts != AV_NOPTS_VALUE) {
509 os->lastdts = AV_NOPTS_VALUE;
512 if (os->granule != -1LL) {
513 if (os->codec && os->codec->granule_is_start)
514 pts = ogg_gptopts(s, idx, os->granule, dts);
516 os->lastpts = ogg_gptopts(s, idx, os->granule, &os->lastdts);
524 ogg_read_packet (AVFormatContext * s, AVPacket * pkt)
527 struct ogg_stream *os;
530 int64_t fpos, pts, dts;
535 if (ogg_packet (s, &idx, &pstart, &psize, &fpos) < 0)
537 }while (idx < 0 || !s->streams[idx]);
540 os = ogg->streams + idx;
542 // pflags might not be set until after this
543 pts = ogg_calc_pts(s, idx, &dts);
545 if (os->keyframe_seek && !(os->pflags & AV_PKT_FLAG_KEY))
547 os->keyframe_seek = 0;
550 if (av_new_packet (pkt, psize) < 0)
552 pkt->stream_index = idx;
553 memcpy (pkt->data, os->buf + pstart, psize);
557 pkt->flags = os->pflags;
558 pkt->duration = os->pduration;
566 ogg_read_close (AVFormatContext * s)
568 struct ogg *ogg = s->priv_data;
571 for (i = 0; i < ogg->nstreams; i++){
572 av_free (ogg->streams[i].buf);
573 av_free (ogg->streams[i].private);
575 av_free (ogg->streams);
581 ogg_read_timestamp (AVFormatContext * s, int stream_index, int64_t * pos_arg,
584 struct ogg *ogg = s->priv_data;
585 struct ogg_stream *os = ogg->streams + stream_index;
586 ByteIOContext *bc = s->pb;
587 int64_t pts = AV_NOPTS_VALUE;
589 url_fseek(bc, *pos_arg, SEEK_SET);
592 while (url_ftell(bc) < pos_limit && !ogg_packet(s, &i, NULL, NULL, pos_arg)) {
593 if (i == stream_index) {
594 pts = ogg_calc_pts(s, i, NULL);
595 if (os->keyframe_seek && !(os->pflags & AV_PKT_FLAG_KEY))
596 pts = AV_NOPTS_VALUE;
598 if (pts != AV_NOPTS_VALUE)
605 static int ogg_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
607 struct ogg *ogg = s->priv_data;
608 struct ogg_stream *os = ogg->streams + stream_index;
611 // Try seeking to a keyframe first. If this fails (very possible),
612 // av_seek_frame will fall back to ignoring keyframes
613 if (s->streams[stream_index]->codec->codec_type == AVMEDIA_TYPE_VIDEO
614 && !(flags & AVSEEK_FLAG_ANY))
615 os->keyframe_seek = 1;
617 ret = av_seek_frame_binary(s, stream_index, timestamp, flags);
619 os->keyframe_seek = 0;
623 static int ogg_probe(AVProbeData *p)
625 if (p->buf[0] == 'O' && p->buf[1] == 'g' &&
626 p->buf[2] == 'g' && p->buf[3] == 'S' &&
627 p->buf[4] == 0x0 && p->buf[5] <= 0x7 )
628 return AVPROBE_SCORE_MAX;
633 AVInputFormat ogg_demuxer = {
635 NULL_IF_CONFIG_SMALL("Ogg"),
644 .metadata_conv = ff_vorbiscomment_metadata_conv,