最简单的基于FFMPEG的推流器附件收流器

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最简单的基于FFmpeg的推流器系列文章列表：

《最简单的基于FFmpeg的推流器（以推送RTMP为例）》

《最简单的基于FFMPEG的推流器附件：收流器》

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出于对《最简单的基于FFmpeg的推流器》的补充，本文记录一个最简单的基于FFmpeg的收流器。收流器和推流器的作用正好相反：推流器用于将本地文件以流媒体的形式发送出去，而收流器用于将流媒体内容保存为本地文件。

本文记录的推流器可以将RTMP流媒体保存成为一个本地的FLV文件。由于FFmpeg本身支持很多的流媒体协议和封装格式，所以也支持其它的封装格式和流媒体协议。

源代码

/** * 最简单的基于FFmpeg的收流器（接收RTMP） * Simplest FFmpeg Receiver (Receive RTMP) *  * 雷霄骅 Lei Xiaohua * [email protected] * 中国传媒大学/数字电视技术 * Communication University of China / Digital TV Technology * http://blog.csdn.net/leixiaohua1020 *  * 本例子将流媒体数据（以RTMP为例）保存成本地文件。 * 是使用FFmpeg进行流媒体接收最简单的教程。 * * This example saves streaming media data (Use RTMP as example) * as a local file. * It's the simplest FFmpeg stream receiver. *  */#include <stdio.h>#define __STDC_CONSTANT_MACROS#ifdef _WIN32//Windowsextern "C"{#include "libavformat/avformat.h"#include "libavutil/mathematics.h"#include "libavutil/time.h"};#else//Linux...#ifdef __cplusplusextern "C"{#endif#include <libavformat/avformat.h>#include <libavutil/mathematics.h>#include <libavutil/time.h>#ifdef __cplusplus};#endif#endif//'1': Use H.264 Bitstream Filter #define USE_H264BSF 0int main(int argc, char* argv[]){ AVOutputFormat *ofmt = NULL; //Input AVFormatContext and Output AVFormatContext AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL; AVPacket pkt; const char *in_filename, *out_filename; int ret, i; int videoindex=-1; int frame_index=0; in_filename  = "rtmp://live.hkstv.hk.lxdns.com/live/hks"; //in_filename  = "rtp://233.233.233.233:6666"; //out_filename = "receive.ts"; //out_filename = "receive.mkv"; out_filename = "receive.flv"; av_register_all(); //Network avformat_network_init(); //Input if ((ret = avformat_open_input(&ifmt_ctx, in_filename, 0, 0)) < 0) {  printf( "Could not open input file.");  goto end; } if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0) {  printf( "Failed to retrieve input stream information");  goto end; } for(i=0; i<ifmt_ctx->nb_streams; i++)   if(ifmt_ctx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO){   videoindex=i;   break;  } av_dump_format(ifmt_ctx, 0, in_filename, 0); //Output avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, out_filename); //RTMP if (!ofmt_ctx) {  printf( "Could not create output context\n");  ret = AVERROR_UNKNOWN;  goto end; } ofmt = ofmt_ctx->oformat; for (i = 0; i < ifmt_ctx->nb_streams; i++) {  //Create output AVStream according to input AVStream  AVStream *in_stream = ifmt_ctx->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;  }  //Copy the settings of AVCodecContext  ret = avcodec_copy_context(out_stream->codec, in_stream->codec);  if (ret < 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; } //Dump Format------------------ av_dump_format(ofmt_ctx, 0, out_filename, 1); //Open output URL if (!(ofmt->flags & AVFMT_NOFILE)) {  ret = avio_open(&ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE);  if (ret < 0) {   printf( "Could not open output URL '%s'", out_filename);   goto end;  } } //Write file header ret = avformat_write_header(ofmt_ctx, NULL); if (ret < 0) {  printf( "Error occurred when opening output URL\n");  goto end; }#if USE_H264BSF AVBitStreamFilterContext* h264bsfc =  av_bitstream_filter_init("h264_mp4toannexb"); #endif while (1) {  AVStream *in_stream, *out_stream;  //Get an AVPacket  ret = av_read_frame(ifmt_ctx, &pkt);  if (ret < 0)   break;    in_stream  = ifmt_ctx->streams[pkt.stream_index];  out_stream = ofmt_ctx->streams[pkt.stream_index];  /* copy packet */  //Convert PTS/DTS  pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, (AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));  pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, (AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));  pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, out_stream->time_base);  pkt.pos = -1;  //Print to Screen  if(pkt.stream_index==videoindex){   printf("Receive %8d video frames from input URL\n",frame_index);   frame_index++;#if USE_H264BSF   av_bitstream_filter_filter(h264bsfc, in_stream->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);#endif  }  //ret = av_write_frame(ofmt_ctx, &pkt);  ret = av_interleaved_write_frame(ofmt_ctx, &pkt);  if (ret < 0) {   printf( "Error muxing packet\n");   break;  }    av_free_packet(&pkt);   }#if USE_H264BSF av_bitstream_filter_close(h264bsfc);  #endif //Write file trailer av_write_trailer(ofmt_ctx);end: avformat_close_input(&ifmt_ctx); /* close output */ if (ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE))  avio_close(ofmt_ctx->pb); avformat_free_context(ofmt_ctx); if (ret < 0 && ret != AVERROR_EOF) {  printf( "Error occurred.\n");  return -1; } return 0;}