- /**
- * 最简单的基于FFmpeg的视音频分离器(简化版)
- * Simplest FFmpeg Demuxer Simple
- *
- * 本程序可以将封装格式中的视频码流数据和音频码流数据分离出来。
- * 在该例子中, 将FLV的文件分离得到H.264视频码流文件和MP3
- * 音频码流文件。
- *
- * 注意:
- * 这个是简化版的视音频分离器。与原版的不同在于,没有初始化输出
- * 视频流和音频流的AVFormatContext。而是直接将解码后的得到的
- * AVPacket中的的数据通过fwrite()写入文件。这样做的好处是流程比
- * 较简单。坏处是对一些格式的视音频码流是不适用的,比如说
- * FLV/MP4/MKV等格式中的AAC码流(上述封装格式中的AAC的AVPacket中
- * 的数据缺失了7字节的ADTS文件头)。
- *
- *
- * This software split a media file (in Container such as
- * MKV, FLV, AVI...) to video and audio bitstream.
- * In this example, it demux a FLV file to H.264 bitstream
- * and MP3 bitstream.
- * Note:
- * This is a simple version of "Simplest FFmpeg Demuxer". It is
- * more simple because it doesn't init Output Video/Audio stream's
- * AVFormatContext. It write AVPacket's data to files directly.
- * The advantages of this method is simple. The disadvantages of
- * this method is it's not suitable for some kind of bitstreams. For
- * example, AAC bitstream in FLV/MP4/MKV Container Format(data in
- * AVPacket lack of 7 bytes of ADTS header).
- *
- */
- #include <stdio.h>
- extern "C"
- {
- #include "libavformat/avformat.h"
- };
- //'1': Use H.264 Bitstream Filter
- #define USE_H264BSF 1
- int main(int argc, char* argv[])
- {
- AVFormatContext *ifmt_ctx = NULL;
- AVPacket pkt;
- int ret, i;
- int videoindex=-1,audioindex=-1;
- char *in_filename = "cuc_ieschool.flv";//输入文件名(Input file URL)
- char *out_filename_v = "cuc_ieschool.h264";//输出文件名(Output file URL)
- char *out_filename_a = "cuc_ieschool.mp3";
- av_register_all();
- //输入(Input)
- if ((ret = avformat_open_input(&ifmt_ctx, in_filename, 0, 0)) < 0) {
- printf( "Could not open input file.");
- return -1;
- }
- if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0) {
- printf( "Failed to retrieve input stream information");
- return -1;
- }
- videoindex=-1;
- for(i=0; i<ifmt_ctx->nb_streams; i++) {
- if(ifmt_ctx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO){
- videoindex=i;
- }else if(ifmt_ctx->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO){
- audioindex=i;
- }
- }
- //Dump Format------------------
- printf("\\nInput Video===========================\\n");
- av_dump_format(ifmt_ctx, 0, in_filename, 0);
- printf("\\n======================================\\n");
- FILE *fp_audio=fopen(out_filename_a,"wb+");
- FILE *fp_video=fopen(out_filename_v,"wb+");
- /*
- FIX: H.264 in some container format (FLV, MP4, MKV etc.) need
- "h264_mp4toannexb" bitstream filter (BSF)
- *Add SPS,PPS in front of IDR frame
- *Add start code ("0,0,0,1") in front of NALU
- H.264 in some container (MPEG2TS) don't need this BSF.
- */
- #if USE_H264BSF
- AVBitStreamFilterContext* h264bsfc = av_bitstream_filter_init("h264_mp4toannexb");
- #endif
- while(av_read_frame(ifmt_ctx, &pkt)>=0){
- if(pkt.stream_index==videoindex){
- #if USE_H264BSF
- av_bitstream_filter_filter(h264bsfc, ifmt_ctx->streams[videoindex]->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);
- #endif
- printf("Write Video Packet. size:%d\\tpts:%d\\n",pkt.size,pkt.pts);
- fwrite(pkt.data,1,pkt.size,fp_video);
- }else if(pkt.stream_index==audioindex){
- /*
- AAC in some container format (FLV, MP4, MKV etc.) need to add 7 Bytes
- ADTS Header in front of AVPacket data manually.
- Other Audio Codec (MP3...) works well.
- */
- printf("Write Audio Packet. size:%d\\tpts:%d\\n",pkt.size,pkt.pts);
- fwrite(pkt.data,1,pkt.size,fp_audio);
- }
- av_free_packet(&pkt);
- }
- #if USE_H264BSF
- av_bitstream_filter_close(h264bsfc);
- #endif
- fclose(fp_video);
- fclose(fp_audio);
- avformat_close_input(&ifmt_ctx);
- if (ret < 0 && ret != AVERROR_EOF) {
- printf( "Error occurred.\\n");
- return -1;
- }
- return 0;
- }
- //该片段来自于http://www.codesnippet.cn/detail/0704201512124.html
来源: http://www.codesnippet.cn/detail/0704201512124.html