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ivfenc: write duration at end-of-stream. 

At the beginning, the value is not initialized.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Ronald S. Bultje 2015-07-12 06:47:20 -04:00 committed by Michael Niedermayer
parent cdb0d7e439
commit 3a18d3fa04
1 changed files with 29 additions and 1 deletions
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30
libavformat/ivfenc.c
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@ -20,6 +20,11 @@
#include "avformat.h"
#include "libavutil/intreadwrite.h"
typedef struct IVFEncContext {
unsigned frame_cnt;
uint64_t last_pts, sum_delta_pts;
} IVFEncContext;
static int ivf_write_header(AVFormatContext *s)
{
AVCodecContext *ctx;
@ -43,7 +48,7 @@ static int ivf_write_header(AVFormatContext *s)
avio_wl16(pb, ctx->height);
avio_wl32(pb, s->streams[0]->time_base.den);
avio_wl32(pb, s->streams[0]->time_base.num);
avio_wl64(pb, s->streams[0]->duration); // TODO: duration or number of frames?!?
avio_wl64(pb, 0xFFFFFFFFFFFFFFFFULL);
return 0;
}
@ -51,14 +56,36 @@ static int ivf_write_header(AVFormatContext *s)
static int ivf_write_packet(AVFormatContext *s, AVPacket *pkt)
{
AVIOContext *pb = s->pb;
IVFEncContext *ctx = s->priv_data;
avio_wl32(pb, pkt->size);
avio_wl64(pb, pkt->pts);
avio_write(pb, pkt->data, pkt->size);
if (ctx->frame_cnt)
ctx->sum_delta_pts += pkt->pts - ctx->last_pts;
ctx->frame_cnt++;
ctx->last_pts = pkt->pts;
return 0;
}
static int ivf_write_trailer(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
if (pb->seekable) {
IVFEncContext *ctx = s->priv_data;
size_t end = avio_tell(pb);
avio_seek(pb, 24, SEEK_SET);
avio_wl64(pb, ctx->frame_cnt * ctx->sum_delta_pts / (ctx->frame_cnt - 1));
avio_seek(pb, end, SEEK_SET);
}
return 0;
}
AVOutputFormat ff_ivf_muxer = {
.priv_data_size = sizeof(IVFEncContext),
.name = "ivf",
.long_name = NULL_IF_CONFIG_SMALL("On2 IVF"),
.extensions = "ivf",
@ -66,4 +93,5 @@ AVOutputFormat ff_ivf_muxer = {
.video_codec = AV_CODEC_ID_VP8,
.write_header = ivf_write_header,
.write_packet = ivf_write_packet,
.write_trailer = ivf_write_trailer,
};