EasyCVR接入华为视频云系统如何实现实时预览？【附代码】

一、通过摄像机编码开启实时浏览：

IVS_INT32 IVS_SDK_StartRealPlay(
    IVS_INT32           iSessionID,
    IVS_REALPLAY_PARAM  *pRealplayPara,
    const IVS_CHAR      *pCameraCode, 
    HWND                hWnd,
    IVS_ULONG           *pHandle);

//cpp code
IVS_REALPLAY_PARAM RealplayPara = {0};
RealplayPara.uiProtocolType = 1;//协议类型，此处1代表UDP
RealplayPara.uiStreamType = STREAM_TYPE_MAIN;//码流类型
IVS_ULONG ulRealPlayHandle = 0;
IVS_INT32 iRet = IVS_SDK_StartRealPlay(iSessionID, &RealplayPara, strCameraCode, m_ShowBox.GetSafeHwnd(), &ulRealPlayHandle);
// m_ShowBox是MFC中Edit Control控件的关联对象
if (IVS_SUCCEED == iRet)
{
    //播放成功，可在此处控制声音和音量等
    IVS_SDK_PlaySound(iSessionID, ulRealPlayHandle);
    IVS_SDK_SetVolume(iSessionID, ulRealPlayHandle, 60);
} 

二、通过摄像机编码开启实时浏览，以回调方式输出拼帧后的裸码流：

IVS_INT32 IVS_SDK_StartRealPlayCBRaw(
    IVS_INT32           iSessionID,
    IVS_REALPLAY_PARAM  *pRealplayPara,
    const IVS_CHAR      *pCameraCode,
    RealPlayCallBackRaw fRealPlayCallBackRaw,
    IVS_VOID            *pUserData,
    IVS_ULONG           *pHandle);

//cpp code
//实况裸码流回调函数，定义必须与RealPlayCallBackRaw保持一致
void __SDK_CALL RealPlayCallBackRawFunc(IVS_ULONG ulHandle, IVS_RAW_FRAME_INFO* pRawFrameInfo, IVS_VOID* pBuf, IVS_UINT32 uiBufSize, IVS_VOID* pUserData)
{
    //回调码流处理
}
IVS_REALPLAY_PARAM RealplayPara = {0};//实况播放参数
RealplayPara.bDirectFirst = 0;
RealplayPara.bMultiCast = 1;
RealplayPara.uiProtocolType = 1;
RealplayPara.uiStreamType = STREAM_TYPE_MAIN;
//设置回调函数
IVS_INT32 iRet = IVS_SDK_StartRealPlayCBRaw(iSessionID, &RealplayPara, strCameraCode, RealPlayCallBackRawFunc, "test", &ulRealPlayHandle);if (IVS_SUCCEED == iRet) 
{ 
    //成功
}

三、开始实时浏览，将媒体流发送到目的IP、PORT。目前只支持UDP、主码流、中转方式。

//cpp code
IVS_INT32 IVS_SDK_StartRealPlayByIP(
    IVS_INT32               iSessionID, 
    const IVS_CHAR          *pCameraCode,
    const IVS_MEDIA_ADDR    *pMediaAddrDst,
    IVS_MEDIA_ADDR          *pMediaAddrSrc,
    IVS_ULONG               *pHandle);
//cpp code
IVS_MEDIA_ADDR MediaAddrDst = {0};//目标地址
IVS_MEDIA_ADDR MediaAddrSrc = {0};//视屏流源地址
MediaAddrDst.stIP.uiIPType = IP_V4;
strncpy(MediaAddrDst.stIP.cIP, "10.170.54.142", IVS_IP_LEN);
MediaAddrDst.uiAudioPort = 2048;
MediaAddrDst.uiVideoPort = 2050;
iRet = IVS_SDK_StartRealPlayByIP(iSessionID, strCameraCode, &MediaAddrDst, &MediaAddrSrc, &ulHandle);
if (IVS_SUCCEED == iRet)
{
    //成功
}