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
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- #include <stdio.h>
-
- #define __STDC_CONSTANT_MACROS
-
- #ifdef _WIN32
-
- extern "C"
- {
- #include "libavformat/avformat.h"
- #include "libavutil/mathematics.h"
- #include "libavutil/time.h"
- };
- #else
-
- #ifdef __cplusplus
- extern "C"
- {
- #endif
- #include <libavformat/avformat.h>
- #include <libavutil/mathematics.h>
- #include <libavutil/time.h>
- #ifdef __cplusplus
- };
- #endif
- #endif
-
-
- #define USE_H264BSF 0
-
- int main(int argc, char* argv[])
- {
- AVOutputFormat *ofmt = NULL;
-
- 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";
-
-
-
- out_filename = "receive.flv";
-
- av_register_all();
-
- avformat_network_init();
-
- 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);
-
-
- avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, out_filename);
-
- 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++) {
-
- 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;
- }
-
- 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;
- }
-
- av_dump_format(ofmt_ctx, 0, out_filename, 1);
-
- 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;
- }
- }
-
- 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;
-
- 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];
-
-
- 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;
-
- 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_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
-
-
- av_write_trailer(ofmt_ctx);
- end:
- avformat_close_input(&ifmt_ctx);
-
- 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;
- }
运行结果
程序运行之后,即可获取流媒体数据并且在本地保存成一个视频文件。下载
simplest ffmpeg streamer
项目主页SourceForge:https://sourceforge.net/projects/simplestffmpegstreamer/
Github:https://github.com/leixiaohua1020/simplest_ffmpeg_streamer
开源中国:http://git.oschina.net/leixiaohua1020/simplest_ffmpeg_streamer
CSDN下载地址:http://download.csdn.net/detail/leixiaohua1020/8924345
解决方案包含2个项目:
simplest_ffmpeg_streamer: 将本地视频文件推送至流媒体服务器。
simplest_ffmpeg_receiver: 将流媒体数据保存成本地文件。