ffmpeg中av_interleaved_write_frame函数的源码分析及其用法

fmpeg中av_interleaved_write_frame的源码。

int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt){
AVStream *st= s->streams[ pkt->stream_index];
int ret;
//FIXME/XXX/HACK drop zero sized packets
if(st->codec->codec_type == AVMEDIA_TYPE_AUDIO && pkt->size==0)
return 0;
av_dlog(s, "av_interleaved_write_frame size:%d dts:%"PRId64" pts:%"PRId64"\n",
pkt->size, pkt->dts, pkt->pts);
if((ret = compute_pkt_fields2(s, st, pkt)) < 0 && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
return ret;
if(pkt->dts == AV_NOPTS_VALUE && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
return AVERROR(EINVAL);
for(;;){
AVPacket opkt;
int ret= interleave_packet(s, &opkt, pkt, 0);
if(ret<=0) //FIXME cleanup needed for ret<0 ?
return ret;
ret= s->oformat->write_packet(s, &opkt);
if (ret >= 0)
s->streams[opkt.stream_index]->nb_frames++;
av_free_packet(&opkt);
pkt= NULL;
if(ret<0)
return ret;
if(s->pb && s->pb->error)
return s->pb->error;
}
}

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我在编码的时候采用如下的代码：

AVPacket pkt;
av_init_packet(&pkt);
if(c->coded_frame->pts != AV_NOPTS_VALUE)
{
pkt.pts = av_rescale_q(c->coded_frame->pts,c->time_base,en_info->video_st->time_base);
}
if(c->coded_frame->key_frame)
pkt.flags |= AV_PKT_FLAG_KEY;
pkt.stream_index = en_info->video_st->index;
pkt.data = en_info->video_outbuf;
pkt.size = en_info->out_size;
ret = av_interleaved_write_frame( en_info->oc , &pkt );

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