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oggdec: output correct timestamps for Vorbis

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Takes encoder delay into account by comparing first the coded page
duration with the calculated page duration. Handles last packet duration
if needed, also by comparing coded duration with calculated duration.
Also does better handling of timestamp generation for packets in the
first page for streamed ogg files where the start time is not
necessarily zero.
This commit is contained in:
Justin Ruggles 2012-02-23 21:40:14 -05:00
parent 9b9fc9ba32
commit f63412fc74
2 changed files with 82 additions and 3 deletions
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2
libavcodec/Makefile
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@ -569,7 +569,7 @@ OBJS-$(CONFIG_MPEGTS_MUXER) += mpegvideo.o mpeg4audio.o
OBJS-$(CONFIG_MPEGTS_DEMUXER) += mpeg4audio.o mpegaudiodata.o
OBJS-$(CONFIG_NUT_MUXER) += mpegaudiodata.o
OBJS-$(CONFIG_OGG_DEMUXER) += flacdec.o flacdata.o flac.o \
dirac.o mpeg12data.o
dirac.o mpeg12data.o vorbis_parser.o
OBJS-$(CONFIG_OGG_MUXER) += xiph.o flacdec.o flacdata.o flac.o
OBJS-$(CONFIG_RTP_MUXER) += mpeg4audio.o mpegvideo.o xiph.o
OBJS-$(CONFIG_SPDIF_DEMUXER) += aacadtsdec.o mpeg4audio.o

83
libavformat/oggparsevorbis.c
View File

@ -28,6 +28,7 @@
#include "libavutil/dict.h"
#include "libavcodec/get_bits.h"
#include "libavcodec/bytestream.h"
#include "libavcodec/vorbis_parser.h"
#include "avformat.h"
#include "internal.h"
#include "oggdec.h"
@ -162,6 +163,9 @@ ff_vorbis_comment(AVFormatContext * as, AVDictionary **m, const uint8_t *buf, in
struct oggvorbis_private {
unsigned int len[3];
unsigned char *packet[3];
VorbisParseContext vp;
int64_t final_pts;
int final_duration;
};
@ -251,7 +255,6 @@ vorbis_header (AVFormatContext * s, int idx)
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_VORBIS;
st->need_parsing = AVSTREAM_PARSE_HEADERS;
if (srate > 0) {
st->codec->sample_rate = srate;
@ -269,15 +272,91 @@ vorbis_header (AVFormatContext * s, int idx)
}
}
} else {
int ret;
st->codec->extradata_size =
fixup_vorbis_headers(s, priv, &st->codec->extradata);
if ((ret = avpriv_vorbis_parse_extradata(st->codec, &priv->vp))) {
av_freep(&st->codec->extradata);
st->codec->extradata_size = 0;
return ret;
}
}
return 1;
}
static int vorbis_packet(AVFormatContext *s, int idx)
{
struct ogg *ogg = s->priv_data;
struct ogg_stream *os = ogg->streams + idx;
struct oggvorbis_private *priv = os->private;
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;
avpriv_vorbis_parse_reset(&priv->vp);
duration = 0;
for (seg = 0; seg < os->nsegs; seg++) {
if (os->segments[seg] < 255) {
int d = avpriv_vorbis_parse_frame(&priv->vp, last_pkt, 1);
if (d < 0) {
duration = os->granule;
break;
}
if (!duration)
first_duration = d;
duration += d;
last_pkt = next_pkt + os->segments[seg];
}
next_pkt += os->segments[seg];
}
os->lastpts = os->lastdts = os->granule - duration;
s->streams[idx]->start_time = os->lastpts + first_duration;
if (s->streams[idx]->duration)
s->streams[idx]->duration -= s->streams[idx]->start_time;
s->streams[idx]->cur_dts = AV_NOPTS_VALUE;
priv->final_pts = AV_NOPTS_VALUE;
avpriv_vorbis_parse_reset(&priv->vp);
}
/* parse packet duration */
if (os->psize > 0) {
duration = avpriv_vorbis_parse_frame(&priv->vp, os->buf + os->pstart, 1);
if (duration <= 0) {
os->pflags |= AV_PKT_FLAG_CORRUPT;
return 0;
}
os->pduration = duration;
}
/* final packet handling
here we save the pts of the first packet in the final page, sum up all
packet durations in the final page except for the last one, and compare
to the page granule to find the duration of the final packet */
if (os->flags & OGG_FLAG_EOS) {
if (os->lastpts != AV_NOPTS_VALUE) {
priv->final_pts = os->lastpts;
priv->final_duration = 0;
}
if (os->segp == os->nsegs)
os->pduration = os->granule - priv->final_pts - priv->final_duration;
priv->final_duration += os->pduration;
}
return 0;
}
const struct ogg_codec ff_vorbis_codec = {
.magic = "\001vorbis",
.magicsize = 7,
.header = vorbis_header
.header = vorbis_header,
.packet = vorbis_packet,
};