我们在常用的安防监控、互联网视频直播等系统服务中,常常最主要的就那么几个环节:
- 视频获取:RTSP源、SDK源、GB28181源;
- 视频输出:RTMP推流、SDK推流、GB28181 PS over RTP输出;
- 视频转换:Demux、Mux、Codec、Snap、Info等等;
今天,我们着重讲解的是视频输出中的RTMP推流功能,这也是我们EasyNVR功能组件中,最为重要的一个组成部分! EasyRTMP是一套封装了基础的RTMP推流协议,并提供了一套非常简单易用调用接口的功能组件,在Github上有多个基于EasyRTMP SDK的Demo。Github地址:https://github.com/EasyDSS/EasyRTMP, Demo中EasyRTMP_RTSP项目是将RTSP流获取到本地进行RTMP推送,可进行RTMP直播。
RTSP视频源进行RTMP直播:EasyRTMP_RTSP
目前市面上的安防设备,现有的以及未来的,基本都是RTSP协议输出格式,且为被动拉流才能从设备获取到音视频流,更不用说直接推流到RTMP流媒体服务器或者CDN了。
在:https://github.com/EasyDSS/EasyRTMP EasyRTMP_RTSP Demo中通过libEasyRTSPClient库将RTSP数据流获取回调,再将获取来的音视频数据送给libEasyRTMP进行RTMP推送。如果获取来的数据不是AAC格式,而是G711、G726、PCM等格式,使用EasyDarwin团队提供的开源的EasyAACEncoder将音频数据转换成AAC格式再推送。这样可以实现将RTSP视频源实时的进行RTMP协议直播。
代码语言:javascript复制/* EasyRTSPClient获取数据后回调给上层 */
int Easy_APICALL __RTSPSourceCallBack( int _chid, void *_chPtr, int _mediatype, char *pbuf, RTSP_FRAME_INFO *frameinfo)
{
if (NULL != frameinfo)
{
if (frameinfo->height==1088) frameinfo->height=1080;
else if (frameinfo->height==544) frameinfo->height=540;
}
Easy_Bool bRet = 0;
int iRet = 0;
//目前只处理视频
if (_mediatype == EASY_SDK_VIDEO_FRAME_FLAG)
{
if(frameinfo && frameinfo->length)
{
if( frameinfo->type == EASY_SDK_VIDEO_FRAME_I)
{
if(g_rtmpPusher.rtmpHandle == 0)
{
g_rtmpPusher.rtmpHandle = EasyRTMP_Create();
bRet = EasyRTMP_Connect(g_rtmpPusher.rtmpHandle, SRTMP);
if (!bRet)
{
printf("Fail to EasyRTMP_Connect ...n");
}
EASY_MEDIA_INFO_T mediaInfo;
memset(&mediaInfo, 0, sizeof(EASY_MEDIA_INFO_T));
mediaInfo.u32VideoFps = 25;
mediaInfo.u32AudioSamplerate = 8000;
iRet = EasyRTMP_InitMetadata(g_rtmpPusher.rtmpHandle, &mediaInfo, 1024);
if (iRet < 0)
{
printf("Fail to InitMetadata ...n");
}
}
EASY_AV_Frame avFrame;
memset(&avFrame, 0, sizeof(EASY_AV_Frame));
avFrame.u32AVFrameFlag = EASY_SDK_VIDEO_FRAME_FLAG;
avFrame.u32AVFrameLen = frameinfo->length;
avFrame.pBuffer = (unsigned char*)pbuf;
avFrame.u32VFrameType = EASY_SDK_VIDEO_FRAME_I;
avFrame.u32TimestampSec = frameinfo->timestamp_sec;
avFrame.u32TimestampUsec = frameinfo->timestamp_usec;
iRet = EasyRTMP_SendPacket(g_rtmpPusher.rtmpHandle, &avFrame);
if (iRet < 0)
{
printf("Fail to EasyRTMP_SendH264Packet(I-frame) ...n");
}
else
{
printf("I");
}
}
else
{
if(g_rtmpPusher.rtmpHandle)
{
EASY_AV_Frame avFrame;
memset(&avFrame, 0, sizeof(EASY_AV_Frame));
avFrame.u32AVFrameFlag = EASY_SDK_VIDEO_FRAME_FLAG;
avFrame.u32AVFrameLen = frameinfo->length-4;
avFrame.pBuffer = (unsigned char*)pbuf 4;
avFrame.u32VFrameType = EASY_SDK_VIDEO_FRAME_P;
avFrame.u32TimestampSec = frameinfo->timestamp_sec;
avFrame.u32TimestampUsec = frameinfo->timestamp_usec;
iRet = EasyRTMP_SendPacket(g_rtmpPusher.rtmpHandle, &avFrame);
if (iRet < 0)
{
printf("Fail to EasyRTMP_SendH264Packet(P-frame) ...n");
}
else
{
printf("P");
}
}
}
}
}
else if (_mediatype == EASY_SDK_AUDIO_FRAME_FLAG)
{
EASY_AV_Frame avFrame;
memset(&avFrame, 0x00, sizeof(EASY_AV_Frame));
avFrame.u32AVFrameFlag = EASY_SDK_AUDIO_FRAME_FLAG;
avFrame.u32TimestampSec = frameinfo->timestamp_sec;
avFrame.u32TimestampUsec = frameinfo->timestamp_usec;
if(frameinfo->codec == EASY_SDK_AUDIO_CODEC_AAC)
{
avFrame.pBuffer = (Easy_U8*)(pbuf);
avFrame.u32AVFrameLen = frameinfo->length;
printf("*");
iRet = EasyRTMP_SendPacket(g_rtmpPusher.rtmpHandle, &avFrame);
}
else if ((frameinfo->codec == EASY_SDK_AUDIO_CODEC_G711A) || (frameinfo->codec == EASY_SDK_AUDIO_CODEC_G711U) || (frameinfo->codec == EASY_SDK_AUDIO_CODEC_G726))
{
if(EasyInitAACEncoder(frameinfo) == 0)
{
memset(g_rtmpPusher.m_pAACEncBufer, 0, 64*1024);
unsigned int iAACBufferLen = 0;
if(Easy_AACEncoder_Encode(g_rtmpPusher.m_pAACEncoderHandle, (unsigned char*)pbuf, frameinfo->length, g_rtmpPusher.m_pAACEncBufer, &iAACBufferLen) > 0)
{
printf("*");
avFrame.pBuffer = (Easy_U8*)(g_rtmpPusher.m_pAACEncBufer);
avFrame.u32AVFrameLen = iAACBufferLen;
iRet = EasyRTMP_SendPacket(g_rtmpPusher.rtmpHandle, &avFrame);
}
}
}
}
return 0;
}
接收RTMP推流并进行RTMP/FLV/HLS/RTSP同步输出:EasyDSS
通常情况下,EasyRTMP推流到标准的RTMP流媒体服务器就能实现基础的RTMP、HLS(m3u8)直播功能,但,如果需要得到一个更好的直播输出效果,我们通常选择的是EasyDSS流媒体服务器,EasyDSS流媒体服务器解决方案是一套集流媒体点播、转码与管理、直播、录像、检索、时移回看于一体的一套完整的商用流媒体服务器解决方案,EasyDSS高性能RTMP流媒体服务器支持RTMP推流,同步输出HTTP、RTMP、HLS、HTTP-FLV、RTSP,支持推流分发/拉流分发,支持秒开、GOP缓冲、录像、检索、回放、录像下载、网页管理等多种功能,是目前市面上最合理的一款流媒体服务器!
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