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Calculate correct packet durations when demuxing Ogg/Speex. This involves

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determining if there is any delay in the first packet and/or any truncation in
the final packet.

Originally committed as revision 20216 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles 2009-10-12 21:30:03 +00:00
parent 933e866735
commit 15299b3821
3 changed files with 52 additions and 1 deletions
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2
libavformat/oggdec.c
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@ -380,6 +380,7 @@ ogg_packet (AVFormatContext * s, int *str, int *dstart, int *dsize)
if (os->header > -1 && os->seq > os->header){
os->pflags = 0;
os->pduration = 0;
if (os->codec && os->codec->packet)
os->codec->packet (s, idx);
if (str)
@ -524,6 +525,7 @@ ogg_read_packet (AVFormatContext * s, AVPacket * pkt)
}
pkt->flags = os->pflags;
pkt->duration = os->pduration;
return psize;
}

1
libavformat/oggdec.h
View File

@ -50,6 +50,7 @@ struct ogg_stream {
unsigned int pstart;
unsigned int psize;
unsigned int pflags;
unsigned int pduration;
uint32_t serial;
uint32_t seq;
uint64_t granule, lastgp;

50
libavformat/oggparsespeex.c
View File

@ -30,6 +30,10 @@
#include "avformat.h"
#include "oggdec.h"
struct speex_params {
int final_packet_duration;
};
static int speex_header(AVFormatContext *s, int idx) {
struct ogg *ogg = s->priv_data;
struct ogg_stream *os = ogg->streams + idx;
@ -69,8 +73,52 @@ static int speex_header(AVFormatContext *s, int idx) {
return 1;
}
static int ogg_page_packets(struct ogg_stream *os)
{
int i;
int packets = 0;
for (i = 0; i < os->nsegs; i++)
if (os->segments[i] < 255)
packets++;
return packets;
}
static int speex_packet(AVFormatContext *s, int idx)
{
struct ogg *ogg = s->priv_data;
struct ogg_stream *os = ogg->streams + idx;
struct speex_params *spxp = os->private;
int packet_size = s->streams[idx]->codec->frame_size;
if (!spxp) {
spxp = av_mallocz(sizeof(*spxp));
os->private = spxp;
}
if (os->flags & OGG_FLAG_EOS && os->lastgp != -1 && os->granule > 0) {
/* first packet of final page. we have to calculate the final packet
duration here because it is the only place we know the next-to-last
granule position. */
spxp->final_packet_duration = os->granule - os->lastgp -
packet_size * (ogg_page_packets(os) - 1);
}
if (!os->lastgp && os->granule > 0)
/* first packet */
os->pduration = os->granule - packet_size * (ogg_page_packets(os) - 1);
else if (os->flags & OGG_FLAG_EOS && os->segp == os->nsegs &&
spxp->final_packet_duration)
/* final packet */
os->pduration = spxp->final_packet_duration;
else
os->pduration = packet_size;
return 0;
}
const struct ogg_codec ff_speex_codec = {
.magic = "Speex ",
.magicsize = 8,
.header = speex_header
.header = speex_header,
.packet = speex_packet
};