调取大华SDK获取IPC音视频流并得到H264帧
目录
调取大华SDK获取IPC音视频流并得到H264帧
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通过调取大华摄像机SDK，获取的音视频码流，其格式为大华的私有格式。需通过大华的码流分析库StreamAnalyzer.dll将私有头和负载分离，从而提取出纯H264及音频帧数据。
第1步：调用sdk获取实况码流
LLONG lRet = CLIENT_RealPlayEx(m_LoginID,iChannel,0);
if(0 != lRet)
{
m_DispHanle[iDispNum-1]=lRet;
SetPlayVideoInfo(iDispNum,iChannel,ServerMode);
CLIENT_SetRealDataCallBackEx2(lRet, RealDataCallBackEx, (LDWORD)this, 0x0f);
CPlayWnd* pWnd = (CPlayWnd*)FromHandle(hWnd);
pWnd->SetWndPlaying(true);
}第2步：在实况流回调函数中将码流送入帧分析库
在这里需要引入分析库StreamAnalyzer.dll，并声明一个处理句柄：ANA_HANDLE m_hParser。后续对私有流的解析都要用到这个句柄。
void CALLBACK RealDataCallBackEx(LLONG lRealHandle, DWORD dwDataType, BYTE *pBuffer,DWORD dwBufSize, LLONG lParam, LDWORD dwUser)
{
LONG lRealPort=GetStreamPort(lRealHandle);
if (0 == lRealPort)
{
return;
}
//Input the stream data getting from the card
BOOL bInput=FALSE;
switch(dwDataType)
{
case 0:
//Original data
ANA_InputData(m_hParser, pBuffer, dwBufSize);
ANA_FRAME_INFO frame;
memset(&frame, 0, sizeof(frame));
//int ret = 0;
while ((/*ret = */ANA_GetMediaFrame(m_hParser, &frame)) == 0)
{
if (((frame.bValid & (1 << E_STREAM_LENGTH)) != 0)
|| ((frame.bValid & (1 << E_STREAM_HEADER)) != 0)
|| ((frame.bValid & (1 << E_STREAM_VERIFY)) != 0)
|| (frame.bValid & (1 << E_STREAM_WATERMARK))
)
continue;
AanlyData(&frame);
}
break;
case 1:
//data with frame info
break;
case 2:
//yuv data
break;
case 3:
//pcm audio data
break;
default:
break;
}
}第3步：获取H264裸流
void AanlyData(const ANA_FRAME_INFO* frame)
{
if (!frame || !frame->pHeader || frame->nLength <= 0)
return;
BOOL isKeyFrame = false;
#if 0
printf("nType=%d nSubType=%d nStreamType=%d nEncodeType=%2d nLength=%6d nBodyLength=%6d "
, frame->nType, frame->nSubType, frame->nStreamType, frame->nEncodeType
, frame->nLength, frame->nBodyLength
);
u_char* payload = frame->pFrameBody;//H264 NALU
for (int i = 0; i < 16*3; i++)
{
printf("%.2x ", payload[i]);
}
printf("\r\n");
#endif
if (frame->nType == FRAME_TYPE_VIDEO)
{
if(frame->nEncodeType == ENCODE_VIDEO_DH_H264)
{
uint32_t streamType = STREAM_TYPE_VIDEO;
uint32_t codecType = VIDEO_TYPE_H264;
/* 进行后续操作，如打包PS等 */
}
}
else if (frame->nType == FRAME_TYPE_AUDIO && m_v_streamid>0)
{
if (frame->nEncodeType == ENCODE_AUDIO_G711A)
{
uint32_t streamType = STREAM_TYPE_AUDIO;
uint32_t codecType = AUDIO_TYPE_G711A;
}
}
else
{
return;
}
}