EasyRTMP实现Demux解析MP4文件进行rtmp推送实现RTMP直播功能

本文转自EasyDarwin团队Kim的博客：http://blog.csdn.net/jinlong0603/article/details/52965101

前面已经介绍过EasyRTMP，这里不再多说，可以网上搜索相关内容。

本文讲述下基于libEasyRTMP推送库实现的MP4文件的直播推送。Github中Demo的下载地址https://github.com/EasyDarwin/EasyRTMP。Demo中EasyRTMP_FILE的工程是将MP4文件进行解析推送。主要使用MP4Demux进行解析，分别获取到音频流和视频流，再利用libEasyRTMP进行RTMP推送，这样就可以达到直播或者点播的效果了。

首先获取音视频编码信息，判断MP4文件是否存储音频轨和视频轨

    //从MP4文件获取音视频编码信息，填入pusher媒体信息结构中
    CMp4_avcC_box videoInfo;
    memset(&videoInfo, 0x00, sizeof(CMp4_avcC_box));
    CMp4_mp4a_box audioInfo;
    memset(&audioInfo, 0x00, sizeof(CMp4_mp4a_box));
    int nVideoTrackId = get_video_info_in_moov(g_root,  videoInfo );
    int nAudioTrackId = get_audio_info_in_moov(g_root,  audioInfo );

如果存在音频轨、视频轨就起线程进行数据流获取并传给libEasyRTMP进行推送

    //视频轨存在
    if (nVideoTrackId>-1)
    {
        mediainfo.u32VideoCodec =   EASY_SDK_VIDEO_CODEC_H264;
        mediainfo.u32VideoFps = 25;
        mediainfo.u32H264SpsLength = videoInfo.sps->sequenceParameterSetLength;
        mediainfo.u32H264PpsLength = videoInfo.pps->pictureParameterSetLength;
        if (videoInfo.sps->sequenceParameterSetNALUnit && videoInfo.sps->sequenceParameterSetLength>0 )
        {
            memcpy(mediainfo.u8H264Sps, videoInfo.sps->sequenceParameterSetNALUnit, mediainfo.u32H264SpsLength);
        }
        if (videoInfo.pps->pictureParameterSetNALUnit && videoInfo.pps->pictureParameterSetLength>0 )
        {
            memcpy(mediainfo.u8H264Pps, videoInfo.pps->pictureParameterSetNALUnit, mediainfo.u32H264PpsLength );
        }

        g_mp4TrackThread[nVideoTrackId] = (HANDLE)_beginthreadex(NULL, 0, VideoThread, (void*)nVideoTrackId,0,0);
        g_bThreadLiving[nVideoTrackId] = true;
    }

    //音频轨存在
    if (nAudioTrackId>-1)
    {
        mediainfo.u32AudioCodec =   EASY_SDK_AUDIO_CODEC_AAC;
        mediainfo.u32AudioSamplerate = audioInfo.samplerate;
        mediainfo.u32AudioChannel = audioInfo.channelcount;

        //Create thread to push mp4 demux data( aac)
        g_mp4TrackThread[nAudioTrackId] = (HANDLE)_beginthreadex(NULL, 0, AudioThread,  (void*)nAudioTrackId,0,0);
        g_bThreadLiving[nAudioTrackId] = true;
    }

主要的部分就是MP4Demux的使用，Demo中提供了代码，可自行学习。

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