海康大华摄像头高起播低延时RTSP网页无插件流媒体播放器EasyPlayer-RTSP-Win录像和抓图实现线程优化方案分享

本文主要是介绍海康大华摄像头高起播低延时RTSP网页无插件流媒体播放器EasyPlayer-RTSP-Win录像和抓图实现线程优化方案分享，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

EasyPlayer-RTSP播放器是一套RTSP专用的播放器，包括有：Windows（支持IE插件，npapi插件）、Android、iOS三个平台，是由青犀TSINGSEE开放平台开发和维护的区别于市面上大部分的通用播放器，EasyPlayer-RTSP系列从2014年初发展至今得到了各行各业(尤其是安防行业)的广泛应用，其主要原因是EasyPlayer-RTSP更加精炼、更加专注，具备低延时和高RTSP协议兼容性。

EasyPlayer-RTSP-Win录像和抓图实现线程优化

测试发现，通过EasyPlayer-RTSP-Win拉取网络摄像机的流, 其音频可能是G711，G726等，而写MP4或者转推RTMP等都不支持这些音频格式，那么我们就需要将其音频转码成AAC，可以使用libEasyAACEncoder库进行转码，然后写MP4或者推送；

然而，在实际应用中，我们发现转码过程其实还是比较耗时的，它甚至会导致解码线程来不及从而使直播延时增大，所以，我们采用队列缓存+线程的方式来优化录像和抓图。

实现如下：

1、录像优化
1> 开启录像

if (pThread->manuRecording == 0x01 && NULL==pThread->m_pMP4Writer && frameinfo.type==EASY_SDK_VIDEO_FRAME_I)//开启录制{//EnterCriticalSection(&pThread->critRecQueue);				if (!pThread->m_pMP4Writer){pThread->m_pMP4Writer = new EasyMP4Writer();}unsigned int timestamp = (unsigned int)time(NULL);time_t tt = timestamp;struct tm *_time = localtime(&tt);char szTime[64] = {0,};strftime(szTime, 32, "%Y%m%d%H%M%S", _time);int nRecordPathLen = strlen(pThread->manuRecordingPath);if (nRecordPathLen==0 || (pThread->manuRecordingPath[nRecordPathLen-1] != '/' && pThread->manuRecordingPath[nRecordPathLen-1] != '\\') ){pThread->manuRecordingPath[nRecordPathLen] = '/';}char sFileName[512] = {0,};sprintf(sFileName, "%sch%d_%s.mp4", pThread->manuRecordingPath, pThread->channelId, szTime);if (!pThread->m_pMP4Writer->CreateMP4File(sFileName, ZOUTFILE_FLAG_FULL)){delete pThread->m_pMP4Writer;pThread->m_pMP4Writer = NULL;//return -1;}		else{}//LeaveCriticalSection(&pThread->critRecQueue);}

2> 录像数据写缓存

					if (NULL != pThread->pRecAVQueue){SSQ_AddData(pThread->pRecAVQueue, channelid, MEDIA_TYPE_VIDEO, (MEDIA_FRAME_INFO*)&frameinfo, pbuf);}

3> 录像线程处理

LPTHREAD_START_ROUTINE CChannelManager::_lpRecordThread( LPVOID _pParam )
{PLAY_THREAD_OBJ *pThread = (PLAY_THREAD_OBJ*)_pParam;if (NULL == pThread)			return 0;pThread->recordThread.flag	=	0x02;#ifdef _DEBUG_TRACE("录像线程[%d]已启动. ThreadId:%d ...\n", pThread->channelId, GetCurrentThreadId());
#endifEasyAACEncoder_Handle m_pAACEncoderHandle = NULL;int buf_size = 1024*1024;char *pbuf = new char[buf_size];if (NULL == pbuf){pThread->recordThread.flag	=	0x00;return 0;}char* m_pAACEncBufer = new char[buf_size];memset(m_pAACEncBufer, 0x00, buf_size);//#define AVCODEC_MAX_AUDIO_FRAME_SIZE	(192000)
#define AVCODEC_MAX_AUDIO_FRAME_SIZE	(64000)int audbuf_len = (AVCODEC_MAX_AUDIO_FRAME_SIZE * 3) / 2;unsigned char *audio_buf = new unsigned char[audbuf_len+1];memset(audio_buf, 0x00, audbuf_len);MEDIA_FRAME_INFO frameinfo;unsigned int channelid = 0;unsigned int mediatype = 0;while (1){if (pThread->recordThread.flag == 0x03)		break;int ret = SSQ_GetData(pThread->pRecAVQueue, &channelid, &mediatype, &frameinfo, pbuf);if (ret < 0){_VS_BEGIN_TIME_PERIOD(1);__VS_Delay(1);_VS_END_TIME_PERIOD(1);continue;}long long nTimeStamp = frameinfo.timestamp_sec*1000+frameinfo.timestamp_usec/1000;byte*pdata=NULL;int datasize=0;bool keyframe=false;try{	if (mediatype == MEDIA_TYPE_VIDEO){pdata = (byte*)pbuf;//获取到的编码数据datasize = frameinfo.length;int nVideoWidth     = frameinfo.width;int nVideoHeight    = frameinfo.height;keyframe = frameinfo.type==EASY_SDK_VIDEO_FRAME_I?true:false;if (pThread->m_pMP4Writer){pThread->m_pMP4Writer->WriteMp4File((unsigned char*)pdata, datasize, keyframe,  nTimeStamp, nVideoWidth, nVideoHeight);}}else //音频{pdata = (byte*)pbuf;//获取到的编码数据datasize = frameinfo.length;int bits_per_sample = frameinfo.bits_per_sample;int channels = frameinfo.channels;int sampleRate = frameinfo.sample_rate;if (EASY_SDK_AUDIO_CODEC_G711U == frameinfo.codec|| EASY_SDK_AUDIO_CODEC_G726 == frameinfo.codec || EASY_SDK_AUDIO_CODEC_G711A == frameinfo.codec ) {if (!m_pAACEncoderHandle){InitParam initParam;initParam.u32AudioSamplerate=frameinfo.sample_rate;initParam.ucAudioChannel=frameinfo.channels;initParam.u32PCMBitSize=frameinfo.bits_per_sample;if (frameinfo.codec == EASY_SDK_AUDIO_CODEC_G711U){initParam.ucAudioCodec = Law_ULaw;} else if (frameinfo.codec == EASY_SDK_AUDIO_CODEC_G726){initParam.ucAudioCodec = Law_G726;}else if (frameinfo.codec == EASY_SDK_AUDIO_CODEC_G711A){initParam.ucAudioCodec = Law_ALaw;}m_pAACEncoderHandle = Easy_AACEncoder_Init( initParam);}unsigned int out_len = 0;int nRet = Easy_AACEncoder_Encode(m_pAACEncoderHandle, (unsigned char*)pbuf, frameinfo.length, (unsigned char*)m_pAACEncBufer, &out_len) ;if (nRet>0&&out_len>0){pdata = (byte*)m_pAACEncBufer;datasize = out_len;frameinfo.codec = EASY_SDK_AUDIO_CODEC_AAC;} else{continue;}}if (pThread->m_pMP4Writer){if (pThread->m_pMP4Writer->CanWrite()){pThread->m_pMP4Writer->WriteAACToMp4File((unsigned char*)pdata, datasize, nTimeStamp, sampleRate, channels, bits_per_sample);}}}}catch (...){continue;}}pThread->recordThread.flag	=	0x00;#ifdef _DEBUG_TRACE("录像线程[%d]已退出 ThreadId:%d.\n", pThread->channelId, GetCurrentThreadId());
#endifreturn 0;
}

2、抓图原理同录像，唯一区别是直接数据传入线程，进行jpg编码存文件，详见EasyPlayer-RTSP的代码(这个代码大部分是开源的)。

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