|
deoindex_v=i;
AVStream *in_stream = ifmt_ctx_v->streams[i];
AVStream *out_stream = avformat_new_stream(ofmt_ctx, in_stream->codec->codec);
if (!out_stream) {
printf( "Failed allocating output stream\n");
ret = AVERROR_UNKNOWN;
goto end;
}
videoindex_out=out_stream->index;
//复制AVCodecContext的设置（Copy the settings of AVCodecContext）
if (avcodec_copy_context(out_stream->codec, in_stream->codec) < 0) {
printf( "Failed to copy context from input to output stream codec context\n");
goto end;
}
out_stream->codec->codec_tag = 0;
if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
break;
}
}
int audioindex_a=-1,audioindex_out=-1;
for (i = 0; i < ifmt_ctx_a->nb_streams; i++) {
//根据输入流创建输出流（Create output AVStream according to input AVStream）
if(ifmt_ctx_a->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO){
audioindex_a=i;
AVStream *in_stream = ifmt_ctx_a->streams[i];
AVStream *out_stream = avformat_new_stream(ofmt_ctx, in_stream->codec->codec);
if (!out_stream) {
printf( "Failed allocating output stream\n");
ret = AVERROR_UNKNOWN;
goto end;
}
audioindex_out=out_stream->index;
//复制AVCodecContext的设置（Copy the settings of AVCodecContext）
if (avcodec_copy_context(out_stream->codec, in_stream->codec) < 0) {
printf( "Failed to copy context from input to output stream codec context\n");
goto end;
}
out_stream->codec->codec_tag = 0;
if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
break;
}
}
//输出一下格式------------------
printf("Output Information====================\n");
av_dump_format(ofmt_ctx, 0, out_filename, 1);
printf("======================================\n");
//打开输出文件（Open output file）
if (!(ofmt->flags & AVFMT_NOFILE)) {
if (avio_open(&ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE) < 0) {
printf( "Could not open output file '%s'", out_filename);
goto end;
}
}
//写文件头（Write file header）
if (avformat_write_header(ofmt_ctx, NULL) < 0) {
printf( "Error occurred when opening output file\n");
goto end;
}
int frame_index=0;
int64_t cur_pts_v=0,cur_pts_a=0;
//FIX
#if USE_H264BSF
AVBitStreamFilterContext* h264bsfc = av_bitstream_filter_init("h264_mp4toannexb");
#endif
#if USE_AACBSF
AVBitStreamFilterContext* aacbsfc = av_bitstream_filter_init("aac_adtstoasc");
#endif
while (1) {
AVFormatContext *ifmt_ctx;
int stream_index=0;
AVStream *in_stream, *out_stream;
//获取一个AVPacket（Get an AVPacket）
if(av_compare_ts(cur_pts_v,ifmt_ctx_v->streams[videoindex_v]->time_base,cur_pts_a,ifmt_ctx_a->streams[audioindex_a]->time_base) <= 0){
ifmt_ctx=ifmt_ctx_v;
stream_index=videoindex_out;
if(av_read_frame(ifmt_ctx, &pkt) >= 0){
do{
if(pkt.stream_index==videoindex_v){
cur_pts_v=pkt.pts;
break;
}
}while(av_read_frame(ifmt_ctx, &pkt) >= 0);
}else{
break;
}
}else{
ifmt_ctx=ifmt_ctx_a;
stream_index=audioindex_out;
if(av_read_frame(ifmt_ctx, &pkt) >= 0){
do{
if(pkt.stream_index==audioindex_a){
cur_pts_a=pkt.pts;
break;
}
}while(av_read_frame(ifmt_ctx, &pkt) >= 0);
}else{
break;
}
}
in_stream = ifmt_ctx->streams[pkt.stream_index];
out_stream = ofmt_ctx->streams[stream_index];
//FIX
#if USE_H264BSF
av_bitstream_filter_filter(h264bsfc, in_stream->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);
#endif
#if USE_AACBSF
av_bitstream_filter_filter(aacbsfc, in_stream->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);
#endif
//FIX：No PTS (Example: Raw H.264)
//Simple Write PTS
if(pkt.pts==AV_NOPTS_VALUE){
//Write PTS
AVRational time_base1=in_stream->time_base;
//Duration between 2 frames (us)
int64_t calc_duration=(double)AV_TIME_BASE/av_q2d(in_stream->r_frame_rate);
//Parameters
pkt.pts=(double)(frame_index*calc_duration)/(double)(av_q2d(time_base1)*AV_TIME_BASE);
pkt.dts=pkt.pts;
pkt.duration=(double)calc_duration/(double)(av_q2d(time_base1)*AV_TIME_BASE);
frame_index++;
}
/* copy packet */
//转换PTS/DTS（Convert PTS/DTS）
pkt.pt |