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简述
使用海康摄像头采集图像时，需要在图像上添加图标、文字等额外数据。可选择使用海康SDK绘图回调函数叠加字符、图像等（请参考上一篇文章）；也可使用海康SDK的解码回调函数，对视频流数据进行解码后处理。该方法流程为：调用视频预览函数NET_DVR_RealPlay_V40()时将第三个参数设置为实时数据回调函数RealDataCallBack()的函数指针，然后在RealDataCallBack()回调函数中注册视频流数据解码函数DecCallbackFUN()，最后在DecCallbackFUN()函数中对数据解析解码、叠加字符等处理。 本文只调用解码回调函数将YV12格式视频流数据转换为RGB32格式数据，然后将RGB32格式数据转换为Image，并使用PictrueBox显示该Image数据，暂不做叠加字符、图像等处理。 代码 1、摄像头操作代码 struct CameraInfo { public string strIP; public short nPort; public string strUserName; public string strPassword; } class IDeviceCamera { public Image m_img = null; public virtual bool InitCamera( CameraInfo stInfo ) { return true; } } class DeviceCamera : IDeviceCamera { private CameraInfo m_stCameraInfo; private bool m_bInitSDK = false; private Int32 m_lUserID = -1; private Int32 m_lRealHandle = -1; private Int32 m_lPort = -1; CHCNetSDK.REALDATACALLBACK RealData = null; //必须得定义为成员变量 public override bool InitCamera( CameraInfo stInfo ) { m_stCameraInfo = stInfo; m_bInitSDK = CHCNetSDK.NET_DVR_Init(); if ( !m_bInitSDK ) { uint nError = CHCNetSDK.NET_DVR_GetLastError(); } CHCNetSDK.NET_DVR_SetConnectTime( 5000, 1 ); CHCNetSDK.NET_DVR_SetReconnect( 10000, 1 ); if ( m_bInitSDK == false ) { MessageBox.Show( "NET_DVR_Init error!" ); return false; } else { //保存SDK日志 To save the SDK log CHCNetSDK.NET_DVR_SetLogToFile( 3, "C:\\SdkLog\\", true ); } string DVRIPAddress = stInfo.strIP; //设备IP地址或者域名 Device IP Int16 DVRPortNumber = stInfo.nPort; //设备服务端口号 Device Port string DVRUserName = stInfo.strUserName;//设备登录用户名 User name to login string DVRPassword = stInfo.strPassword;//设备登录密码 Password to login CHCNetSDK.NET_DVR_DEVICEINFO_V30 DeviceInfo = new CHCNetSDK.NET_DVR_DEVICEINFO_V30(); m_lUserID = CHCNetSDK.NET_DVR_Login_V30( DVRIPAddress, DVRPortNumber, DVRUserName, DVRPassword, ref DeviceInfo ); if ( m_lUserID < 0 ) { MessageBox.Show( "登录失败！" ); CHCNetSDK.NET_DVR_Cleanup(); return false; } // CHCNetSDK.NET_DVR_PREVIEWINFO lpPreviewInfo = new CHCNetSDK.NET_DVR_PREVIEWINFO(); lpPreviewInfo.hPlayWnd = (IntPtr)null; lpPreviewInfo.lChannel = 1; lpPreviewInfo.dwStreamType = 0; //码流类型：0-主码流，1-子码流，2-码流3，3-码流4，以此类推 lpPreviewInfo.dwLinkMode = 0; //连接方式：0- TCP方式，1- UDP方式，2- 多播方式，3- RTP方式，4-RTP/RTSP，5-RSTP/HTTP lpPreviewInfo.bBlocked = true; //0- 非阻塞取流，1- 阻塞取流 lpPreviewInfo.dwDisplayBufNum = 15; //播放库播放缓冲区最大缓冲帧数 //使用回调函数取摄像头数据 RealData = new CHCNetSDK.REALDATACALLBACK( RealDataCallBack );//预览实时流回调函数 IntPtr pUser = new IntPtr();//用户数据 m_lRealHandle = CHCNetSDK.NET_DVR_RealPlay_V40( m_lUserID, ref lpPreviewInfo, RealData, pUser ); CHCNetSDK.NET_DVR_RigisterDrawFun( m_lRealHandle, new CHCNetSDK.DRAWFUN( cbDrawFun ), 0 );//回调函数：绘制图标 return true; } private uint nLastErr = 0; private static PlayCtrl.DECCBFUN m_fDisplayFun = null; private IntPtr m_ptrRealHandle; public void RealDataCallBack( Int32 lRealHandle, UInt32 dwDataType, IntPtr pBuffer, UInt32 dwBufSize, IntPtr pUser ) { //下面数据处理建议使用委托的方式 switch ( dwDataType ) { case CHCNetSDK.NET_DVR_SYSHEAD: // sys head if ( dwBufSize > 0 ) { if ( m_lPort >= 0 ) return; //同一路码流不需要多次调用开流接口 //获取播放句柄 Get the port to play if ( !PlayCtrl.PlayM4_GetPort( ref m_lPort ) ) { nLastErr = PlayCtrl.PlayM4_GetLastError( m_lPort ); break; } //设置流播放模式 Set the stream mode: real-time stream mode if ( !PlayCtrl.PlayM4_SetStreamOpenMode( m_lPort, PlayCtrl.STREAME_REALTIME ) ) { nLastErr = PlayCtrl.PlayM4_GetLastError( m_lPort ); //str = "Set STREAME_REALTIME mode failed, error code= " + nLastErr; //this.BeginInvoke( AlarmInfo, str ); } //打开码流，送入头数据 Open stream if ( !PlayCtrl.PlayM4_OpenStream( m_lPort, pBuffer, dwBufSize, 2 * 1024 * 1024 ) ) { nLastErr = PlayCtrl.PlayM4_GetLastError( m_lPort ); //str = "PlayM4_OpenStream failed, error code= " + nLastErr; //this.BeginInvoke( AlarmInfo, str ); break; } //设置显示缓冲区个数 Set the display buffer number if ( !PlayCtrl.PlayM4_SetDisplayBuf( m_lPort, 15 ) ) { nLastErr = PlayCtrl.PlayM4_GetLastError( m_lPort ); //str = "PlayM4_SetDisplayBuf failed, error code= " + nLastErr; //this.BeginInvoke( AlarmInfo, str ); } //设置显示模式 Set the display mode //if ( !PlayCtrl.PlayM4_SetOverlayMode( m_lPort, 0, 0) ) //play off screen //{ // nLastErr = PlayCtrl.PlayM4_GetLastError( m_lPort ); // //str = "PlayM4_SetOverlayMode failed, error code= " + nLastErr; // //this.BeginInvoke( AlarmInfo, str ); //} //设置解码回调函数，获取解码后音视频原始数据 Set callback function of decoded data m_fDisplayFun = new PlayCtrl.DECCBFUN( DecCallbackFUN ); if ( !PlayCtrl.PlayM4_SetDecCallBackEx( m_lPort, m_fDisplayFun, IntPtr.Zero, 0 ) ) { //this.BeginInvoke( AlarmInfo, "PlayM4_SetDisplayCallBack fail" ); } //开始解码 Start to play if ( !PlayCtrl.PlayM4_Play( m_lPort, m_ptrRealHandle ) ) { nLastErr = PlayCtrl.PlayM4_GetLastError( m_lPort ); //str = "PlayM4_Play failed, error code= " + nLastErr; //this.BeginInvoke( AlarmInfo, str ); break; } } break; case CHCNetSDK.NET_DVR_STREAMDATA: // video stream data default: //the other data if ( dwBufSize > 0 && m_lPort != -1 ) { for ( int i = 0; i < 999; i++ ) { //送入码流数据进行解码 Input the stream data to decode if ( !PlayCtrl.PlayM4_InputData( m_lPort, pBuffer, dwBufSize ) ) { nLastErr = PlayCtrl.PlayM4_GetLastError( m_lPort ); //str = "PlayM4_InputData failed, error code= " + nLastErr; Thread.Sleep( 2 ); } else break; } } break; } } //解码回调函数 private void DecCallbackFUN( int nPort, IntPtr pBuf, int nSize, ref PlayCtrl.FRAME_INFO pFrameInfo, int nReserved1, int nReserved2 ) { if ( pFrameInfo.nType == 3 ) //#define T_YV12 3 { byte[] byteBuffYV12 = new byte[ nSize ]; Marshal.Copy( pBuf, byteBuffYV12, 0, nSize ); long lRGBSize = (long)pFrameInfo.nWidth * pFrameInfo.nHeight * 4; byte[] bufferRGB32 = new byte[ lRGBSize ]; CommonFun.YV12_to_RGB32( byteBuffYV12, bufferRGB32, pFrameInfo.nWidth, pFrameInfo.nHeight ); byteBuffYV12 = null; Bitmap bmpFromGRB32 = CommonFun.RGB32_to_Image( bufferRGB32, pFrameInfo.nWidth, pFrameInfo.nHeight ); bufferRGB32 = null; if ( null == bmpFromGRB32 ) return; m_img = bmpFromGRB32; } } }注：得到的m_img用于PictureBox进行显示。 2、YV12转换为RGB32、RGB32转换为Image代码 class CommonFun { public static bool YV12_to_RGB32( byte[] buffYV12, byte[] bufferRGB32, int nWidth, int nHeight ) { if( buffYV12.Length < 0 || bufferRGB32.Length < 0 ) return false; long nYLen = (long)nWidth * nHeight; int nHfWidth = ( nWidth >> 1 ); if ( nYLen < 1 || nHfWidth < 1 ) return false; byte[] byteYData = buffYV12.Skip( 0 ).Take( nWidth*nHeight ).ToArray(); byte[] byteUData = buffYV12.Skip( nWidth*nHeight ).Take( (nHeight/2)*(nWidth/2) ).ToArray(); byte[] byteVData = buffYV12.Skip( nWidth*nHeight + (nHeight/2)*(nWidth/2) ).Take( (nHeight/2)*(nWidth/2) ).ToArray(); if ( byteYData.Length < 0 || byteVData.Length < 0 || byteUData.Length < 0 ) return false; int[] nRgb = new int[4]; for( int nRow = 0; nRow < nHeight; nRow++ ) { for( int nCol = 0; nCol < nWidth; nCol++ ) { int Y = byteYData[nRow*nWidth + nCol]; int U = byteUData[(nRow / 2)*(nWidth / 2) + (nCol / 2)]; int V = byteVData[(nRow / 2)*(nWidth / 2) + (nCol / 2)]; int R = Y + (U - 128) + (((U - 128) * 103) >> 8); int G = Y - (((V - 128) * 88) >> 8) - (((U - 128) * 183) >> 8); int B = Y + (V - 128) + (((V - 128) * 198) >> 8); // r分量值 R = R 255 ? 255 : R; // g分量值 G = G 255 ? 255 : G; // b分量值 B = B 255 ? 255 : B; //A分量值 nRgb[ 3 ] = 255; //Out RGB Buffer bufferRGB32[4 * (nRow*nWidth + nCol) + 0] = (byte)nRgb[0]; bufferRGB32[4 * (nRow*nWidth + nCol) + 1] = (byte)nRgb[1]; bufferRGB32[4 * (nRow*nWidth + nCol) + 2] = (byte)nRgb[2]; bufferRGB32[4 * (nRow*nWidth + nCol) + 3] = (byte)nRgb[3]; } } return true; } public static Bitmap RGB32_to_Image( byte[] byteBuff, int nWidth, int nHeight ) { if ( byteBuff.Length |
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