LiveRTMP之MP4文件进行rtmp点播直播推送（三）

前面已经介绍过LiveRTMP，这里不再多说，可以网上搜索相关内容。

本文讲述下基于libLiveRTMP推送库实现的MP4文件的直播推送。Demo中LiveRTMP_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libLiveRTMP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。