C#：使用海康SDK解码回调函数DecCallbackFUN()

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  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 )
                    {
                        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 

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 > 1 );

            if ( nYLen > 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 

效果

C#：使用海康SDK解码回调函数DecCallbackFUN()

标签：length   数据转换   方式   def   颜色   http   分享   参考   ast   

原文地址：http://blog.51cto.com/weiyuqingcheng/2323546