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oggdec: Support chained streams, support replacing streams in multistream files.

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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	Changelog
This commit is contained in:
Michael Niedermayer 2013-01-16 19:58:59 +01:00
parent 6136b989f6
commit 7cb27d216d
2 changed files with 28 additions and 8 deletions
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1
Changelog
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@ -5,6 +5,7 @@ version <next>:
- VDPAU hardware acceleration through normal hwaccel
- SRTP support
- Error diffusion dither in Swscale
- Chained Ogg support
version 1.1:

35
libavformat/oggdec.c
View File

@ -57,6 +57,7 @@ static const struct ogg_codec * const ogg_codecs[] = {
};
static int64_t ogg_calc_pts(AVFormatContext *s, int idx, int64_t *dts);
static int ogg_new_stream(AVFormatContext *s, uint32_t serial);
//FIXME We could avoid some structure duplication
static int ogg_save(AVFormatContext *s)
@ -169,30 +170,48 @@ static const struct ogg_codec *ogg_find_codec(uint8_t *buf, int size)
* situation where a new audio stream spawn (identified with a new serial) and
* must replace the previous one (track switch).
*/
static int ogg_replace_stream(AVFormatContext *s, uint32_t serial)
static int ogg_replace_stream(AVFormatContext *s, uint32_t serial, int nsegs)
{
struct ogg *ogg = s->priv_data;
struct ogg_stream *os;
unsigned bufsize;
uint8_t *buf;
const struct ogg_codec *codec;
int i = 0;
if (ogg->nstreams != 1) {
if (s->pb->seekable) {
uint8_t magic[8];
int64_t pos = avio_tell(s->pb);
avio_skip(s->pb, nsegs);
avio_read(s->pb, magic, sizeof(magic));
avio_seek(s->pb, pos, SEEK_SET);
codec = ogg_find_codec(magic, sizeof(magic));
if (!codec) {
av_log(s, AV_LOG_ERROR, "Cannot identify new stream\n");
return AVERROR_INVALIDDATA;
}
for (i = 0; i < ogg->nstreams; i++) {
if (ogg->streams[i].codec == codec)
break;
}
if (i >= ogg->nstreams)
return ogg_new_stream(s, serial);
} else if (ogg->nstreams != 1) {
av_log_missing_feature(s, "Changing stream parameters in multistream ogg", 0);
return AVERROR_PATCHWELCOME;
}
os = &ogg->streams[0];
os = &ogg->streams[i];
os->serial = serial;
return 0;
return i;
buf = os->buf;
bufsize = os->bufsize;
codec = os->codec;
if (!ogg->state || ogg->state->streams[0].private != os->private)
av_freep(&ogg->streams[0].private);
if (!ogg->state || ogg->state->streams[i].private != os->private)
av_freep(&ogg->streams[i].private);
/* Set Ogg stream settings similar to what is done in ogg_new_stream(). We
* also re-use the ogg_stream allocated buffer */
@ -203,7 +222,7 @@ static int ogg_replace_stream(AVFormatContext *s, uint32_t serial)
os->header = -1;
os->codec = codec;
return 0;
return i;
}
static int ogg_new_stream(AVFormatContext *s, uint32_t serial)
@ -334,7 +353,7 @@ static int ogg_read_page(AVFormatContext *s, int *sid)
idx = ogg_find_stream(ogg, serial);
if (idx < 0) {
if (data_packets_seen(ogg))
idx = ogg_replace_stream(s, serial);
idx = ogg_replace_stream(s, serial, nsegs);
else
idx = ogg_new_stream(s, serial);