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oggtheora: Fix initial pts

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code based on the solution in vorbis

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-05-04 14:36:17 +02:00
parent 49d935b5d2
commit 231d32c8d7
1 changed files with 42 additions and 0 deletions
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42
libavformat/oggparsetheora.c
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@ -151,9 +151,51 @@ theora_gptopts(AVFormatContext *ctx, int idx, uint64_t gp, int64_t *dts)
return iframe + pframe;
}
static int theora_packet(AVFormatContext *s, int idx)
{
struct ogg *ogg = s->priv_data;
struct ogg_stream *os = ogg->streams + idx;
int duration;
/* first packet handling
here we parse the duration of each packet in the first page and compare
the total duration to the page granule to find the encoder delay and
set the first timestamp */
if (!os->lastpts) {
int seg;
uint8_t *last_pkt = os->buf + os->pstart;
uint8_t *next_pkt = last_pkt;
int first_duration = 0;
duration = 0;
for (seg = 0; seg < os->nsegs; seg++) {
if (os->segments[seg] < 255) {
if (!duration)
first_duration = 1;
duration++;
last_pkt = next_pkt + os->segments[seg];
}
next_pkt += os->segments[seg];
}
os->lastpts = os->lastdts = theora_gptopts(s, idx, os->granule, NULL) - duration;
s->streams[idx]->start_time = os->lastpts + first_duration;
if (s->streams[idx]->duration)
s->streams[idx]->duration -= s->streams[idx]->start_time;
}
/* parse packet duration */
if (os->psize > 0) {
os->pduration = 1;
}
return 0;
}
const struct ogg_codec ff_theora_codec = {
.magic = "\200theora",
.magicsize = 7,
.header = theora_header,
.packet = theora_packet,
.gptopts = theora_gptopts
};