使用C#对华为IPC摄像头二次开发（一）

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摘要

开发环境：操作系统：Win10 x64专业版2004开发工具：VS2019 16.7.2目标平台：x86首先去下载IPC SDK（点击下载，需要华为授权账户。）
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开发环境：

操作系统：Win10 x64专业版2004

开发工具：VS2019 16.7.2

目标平台：x86

首先去下载IPC SDK（点击下载，需要华为授权账户。）

新建一个WPF的项目，Framework版本为4.7

把下载的sdk压缩包中的windowsoutput32目录中的HWPuSDK.dll和lib目录中的所有文件，都复制到项目的bin/debug目录中（和生成的exe同级），华为的这个SDK对64位支持不好，使用64位遇到不少问题，最终还是先采用32位的DLL。

项目中对图像的手动处理，经过对比，在Emgu CV和OpenCVSharp4中采用了OpenCVSharp4，个人感觉OpenCVSharp4使用起来更简洁方便。

项目中对视频流的回调手动处理展示，采用WriteableBitmap（参考吕毅大神的《WPF 高性能位图渲染 WriteableBitmap 及其高性能用法示例》），本来想采用D3D这种显卡加速的方法，无奈没有找到相关文章和资料，如果哪位大神有资料，还望告知一下。谢谢！

项目中引用了以下组件

使用C#对华为IPC摄像头二次开发（一）

在本次开发中，我们先实现自动预览摄像头视频和手动对摄像头视频流进行处理。

因为SDK自动播放需要传入一个控件的句柄，而WPF中窗体上所有控件的句柄都是窗体本身，所以我们还需要使用WindowsFromHost来使用Winform的一些控件来实现播放句柄的传入。

项目中引用WindowsFromsIntegeration

使用C#对华为IPC摄像头二次开发（一）

在项目的MainWindow.xaml中添加三个按钮、两个RadioButton、一个Winform的PictureBox和一个WPF的Image控件。大致布局如下：

使用C#对华为IPC摄像头二次开发（一）

详细的xaml代码：

<Window x:Class="HuaWeiCamera.MainWindow"         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"         xmlns:wf="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms"         mc:Ignorable="d"         WindowStartupLocation="CenterScreen"         Loaded="MainWindow_OnLoaded"         Title="MainWindow" Height="800" Width="1200" Closed="MainWindow_OnClosed">     <Grid Margin="0,0,2,0">         <Grid.RowDefinitions>             <RowDefinition Height="60"></RowDefinition>             <RowDefinition Height="*"></RowDefinition>         </Grid.RowDefinitions>         <WrapPanel VerticalAlignment="Center">             <StackPanel Margin="30,5,0,0" VerticalAlignment="Center">                 <Button Content="预览摄像头" HorizontalAlignment="Center" VerticalAlignment="Center" Width="75" Height="30" Click="ButtonView_OnClick" />                 <WrapPanel Margin="0,5,0,0">                     <RadioButton Content="自动处理" VerticalAlignment="Center" IsChecked="True" GroupName="PlayMode" x:Name="RadioButtonAuto" />                     <RadioButton Content="手动处理" VerticalAlignment="Center" GroupName="PlayMode" x:Name="RadioButtonManual" Margin="10,0,0,0" />                 </WrapPanel>             </StackPanel>             <Button x:Name="ButtonSaveOne" Content="抓拍一张" HorizontalAlignment="Left" VerticalAlignment="Center" Margin="30,0,0,0" Width="75" Height="30" IsEnabled="False" Click="ButtonSave_OnClick" />
            <Button Content="人脸抓拍" HorizontalAlignment="Left" VerticalAlignment="Center" Margin="30,0,0,0" Width="75" Height="30" />         </WrapPanel>         <WrapPanel Grid.Row="1">             <WindowsFormsHost HorizontalAlignment="Center" Width="1200" Height="700" VerticalAlignment="Center" x:Name="FormsHostVideo">                 <wf:PictureBox x:Name="ImagePlay"></wf:PictureBox>             </WindowsFormsHost>             <Image VerticalAlignment="Center" HorizontalAlignment="Center" x:Name="CanvaVideo" Stretch="Fill" Source="{Binding Path=VideoWriteableBitmap}" />          </WrapPanel>     </Grid> </Window>

在App.cs中定义下日志记录类

    public partial class App : Application     {         public static NLog.Logger NewNLog;         private void App_OnStartup(object sender, StartupEventArgs e)         {             DispatcherUnhandledException += App_DispatcherUnhandledException;             NewNLog = NLog.LogManager.GetLogger("HuaWeiCameraLoger");         }     }

根据华为的《SDC 8.0.1 SDK开发指南》，我们要实现摄像头预览，需要先定义以下几个struct和enum：

sturct：PU_REAL_PLAY_INFO_S（视频实时预览结构体）、PU_TIME_S（时间结构体）

enum：PU_PROTOCOL_TYPE（传输协议类型）、PU_STREAM_TYPE（码流类型）、PU_VIDEO_TYPE（数据流类型）、PU_MEDIA_CRYPTO_TYPE（加密类型）、PU_MEDIA_CALLBACK_TYPE（回调类型）

using System; using System.Runtime.InteropServices; using HuaWeiCamera.Enums; using HuaWeiCamera.Enums.Media; using HuaWeiCamera.Enums.Video;  namespace HuaWeiCamera.Struct {     /// <summary>     /// 视频实时预览结构体,http://www.cnblogs.com/wdw984     /// </summary>     [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]     public struct PU_REAL_PLAY_INFO_S     {         /// <summary>         /// 设备通道号，一般为101。         /// </summary>         public uint ulChannelId;         /// <summary>         /// 播放窗口句柄,为IntPtr.Zero表示用户自己处理视频数据流，不自动播放视频流         /// </summary>         public IntPtr hPlayWnd;         /// <summary>         /// 码流类型,主码流、子码         /// </summary>         public PU_STREAM_TYPE enStreamType;         /// <summary>         /// 流类型：视频流、音频流、复合流、录 像流、元数据         /// </summary>         public PU_VIDEO_TYPE enVideoType;         /// <summary>         /// 传输协议类型，UDP,TCP         /// </summary>         public PU_PROTOCOL_TYPE enProtocolType;         /// <summary>         /// 回调类型：0:RTP解密1:RTP不解密 2:Frame 3:YUV         /// </summary>         public PU_MEDIA_CALLBACK_TYPE enMediaCallbackType;         /// <summary>         /// 请求端IP，第三方平台可以不填，SDK会 自动获取         /// </summary>         [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 16)]         public string szLocalIp;         /// <summary>         /// 是否保活         /// </summary>         public bool bKeepLive;         /// <summary>         /// 请求预录、录像开始时间（本地时 间）。          /// </summary>         public PU_TIME_S stStartTime;         /// <summary>         /// 请求预录、录像结束时间（本地时 间）。          /// </summary>         public PU_TIME_S stEndTime;         /// <summary>         /// 加密类型，只支持AES加密。         /// </summary>         public PU_MEDIA_CRYPTO_TYPE enMediaCryptoType;         /// <summary>         /// 加密密钥         /// </summary>         [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 44)]         public string szMediaCrypto;         /// <summary>         /// szReserved[0-15]表示组播IP地址         /// szReserved[16-19]表示组播端口         /// szReserved[22]表示智能分析数据打包 格式 0:XML,1:元数据         /// szReserved[23]表示元数据请求类型，取值参考枚举 PU_METADATA_REQUEST_TYPE_E定义         /// </summary>         [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)]         public byte[] szReserved;     } }

namespace HuaWeiCamera.Enums {     /// <summary>     /// 视频流类型,http://www.cnblogs.com/wdw984     /// </summary>     public enum PU_STREAM_TYPE     {         /// <summary>         /// 视频主码流         /// </summary>         PU_VIDEO_MAIN_STREAM=0,         /// <summary>         /// 视频子码流         /// </summary>         PU_VIDEO_SUB_STREAM1,         /// <summary>         /// 视频子码流2（VWareC01 不支持）         /// </summary>         PU_VIDEO_SUB_STREAM2,         /// <summary>         /// 视频子码流3（VWareC01 不支持）         /// </summary>         PU_VIDEO_SUB_STREAM3,         /// <summary>         /// 视频子码流4         /// </summary>         PU_VIDEO_SUB_STREAM4,         /// <summary>         /// 视频子码流5         /// </summary>         PU_VIDEO_SUB_STREAM5,         /// <summary>         /// 预留值         /// </summary>          PU_VIDEO_STREAM_MAX     } }

namespace HuaWeiCamera.Enums.Video {     /// <summary>     /// 码流类型,http://www.cnblogs.com/wdw984     /// </summary>     public enum PU_VIDEO_TYPE     {         /// <summary>         /// 视频流         /// </summary>         PU_VIDEO_TYPE_VIDEO = 0,         /// <summary>         /// 音频流         /// </summary>         PU_VIDEO_TYPE_AUDIO,         /// <summary>         /// 复合流         /// </summary>         PU_VIDEO_TYPE_MUX,          /// <summary>         /// 录像流         /// </summary>         PU_VIDEO_TYPE_RECORD,          /// <summary>         /// 元数据流         /// </summary>         PU_VIDEO_TYPE_META,          /// <summary>         /// 视频+元数据流         /// </summary>         PU_VIDEO_TYPE_VIDEO_META,          /// <summary>         /// 预留值         /// </summary>         PU_VIDEO_TYPE_MAX     } }

namespace HuaWeiCamera.Enums {     /// <summary>     /// 数据传输类型,http://www.cnblogs.com/wdw984     /// </summary>     public enum PU_PROTOCOL_TYPE     {         /// <summary>         /// UDP         /// </summary>         PU_PROTOCOL_TYPE_UDP = 0,          /// <summary>         /// TCP         /// </summary>         PU_PROTOCOL_TYPE_TCP,         /// <summary>         /// 组播方式         /// </summary>         PU_PROTOCOL_TYPE_MULTICAST,         /// <summary>         /// 预留值         /// </summary>         PU_PROTOCOL_TYPE_MAX     } }

namespace HuaWeiCamera.Enums.Media {     /// <summary>     /// 媒体回调类型,http://www.cnblogs.com/wdw984     /// </summary>     public enum PU_MEDIA_CALLBACK_TYPE     {         /// <summary>         /// RTP包方式         /// </summary>         PU_MEDIA_CALLBACK_TYPE_RTP = 0,          /// <summary>         /// RTP包形式，不解密         /// </summary>         PU_MEDIA_CALLBACK_TYPE_RTP_CRYPTO,          /// <summary>         /// 帧回调方式         /// </summary>         PU_MEDIA_CALLBACK_TYPE_FRAME,          /// <summary>         /// YUV方式，Linux不支持         /// </summary>         PU_MEDIA_CALLBACK_TYPE_YUV,          /// <summary>         /// 把RTP包回调给控件方处理方式，Linux不支持         /// </summary>         PU_MEDIA_CALLBACK_TYPE_FOR_STORAGE,          /// <summary>         /// 智能元数据方式         /// </summary>         PU_MEDIA_CALLBACK_TYPE_META_FRAME,          /// <summary>         /// 预留值         /// </summary>         PU_MEDIA_CALLBACK_TYPE_MAX     } }

using System.Runtime.InteropServices;  namespace HuaWeiCamera.Struct {     /// <summary>     /// 时间结构体，http://www.cnblogs.com/wdw984     /// </summary>     [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]     public struct PU_TIME_S     {         /// <summary>         /// 年         /// </summary>         [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 5)]         public string szYear;         /// <summary>         /// 月         /// </summary>         [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 3)]         public string szMonth;         /// <summary>         /// 日         /// </summary>         [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 3)]         public string szDay;         /// <summary>         /// 时         /// </summary>         [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 3)]         public string szHour;         /// <summary>         /// 分         /// </summary>         [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 3)]         public string szMinute;         /// <summary>         /// 秒         /// </summary>         [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 3)]         public string szSecond;     } }

定义一个静态类，用来实现调用SDK和摄像头交互（HuaWeiSDKHelper）

using System; using System.Runtime.InteropServices; using HuaWeiCamera.Enums; using HuaWeiCamera.Enums.SnapShot; using HuaWeiCamera.Struct;  namespace HuaWeiCamera.Class {     /// <summary>     /// 华为HoloSens SDC二次开发使用，http://www.cnblogs.com/wdw984     /// </summary>     public static class HuaWeiSdkHelper     {         private const string SdkPath= "HWPuSDK.dll";         #region 初始化和登录          /// <summary>         /// 初始化设备         /// </summary>         /// <param name="ulLinkMode">0自动 1手动 3混合模式</param>         /// <param name="szLocalIp">本地IP</param>         /// <param name="ulLocalPort">本地端口</param>         /// <returns></returns>         [DllImport(SdkPath, EntryPoint = "IVS_PU_Init", CharSet = CharSet.Ansi, SetLastError = true, PreserveSig = true, CallingConvention = CallingConvention.StdCall)]         public static extern bool IVS_Pu_Init(uint ulLinkMode, string szLocalIp, uint ulLocalPort);         /// <summary>         /// 远程登录设备         /// </summary>         /// <param name="szLoginIp">设备IP</param>         /// <param name="ulLoginPort">设备端口 6060</param>         /// <param name="szUserName">登录名 ApiAdmin</param>         /// <param name="szPasswd">登录密码 HuaWei123</param>         /// <returns></returns>         [DllImport(SdkPath, EntryPoint = "IVS_PU_Login", CharSet = CharSet.Ansi, SetLastError = true, PreserveSig = true, CallingConvention = CallingConvention.StdCall)]         public static extern uint IVS_PU_Login(string szLoginIp, uint ulLoginPort, string szUserName, string szPasswd);          /// <summary>         /// 初始化和登录设备         /// </summary>         /// <param name="sdcIp">SDC设备IP</param>         /// <param name="sdcPort">SDC设备端口</param>         /// <param name="sdcUser">SDC登录用户名</param>         /// <param name="sdcPwd">SDC登录密码</param>         /// <param name="errMsg">失败时的错误信息</param>         /// <param name="ulIdentifyId">登录成功后返回登录句柄</param>         public static void InitAndLogin(string sdcIp,uint sdcPort,string sdcUser,string sdcPwd,out uint ulIdentifyId,out string errMsg)         {             ulIdentifyId = 0;             errMsg = "";             //要开启TLS的情况时：初始化调用IVS_PU_InitEx接口，登录调用IVS_PU_Login 接口时端口号设置为6061             if (!IVS_Pu_Init(1, "192.168.2.144", 6060))             {                 errMsg=($"设备初始化失败，{GetLastErrorInfo()}");                 return;             }             ulIdentifyId = IVS_PU_Login(sdcIp, sdcPort, sdcUser, sdcPwd);             if (ulIdentifyId == 0)             {                 errMsg=$"设备登录失败，{GetLastErrorInfo()}";             }         }          #endregion          #region 预览相关         /// <summary>         /// 实时预览         /// </summary>         /// <param name="ulIdentifyId">登录成功后返回的用户编号</param>         /// <param name="pstRealPlayInfo">播放结构体</param>         /// <param name="fRealDataCallBack">回调实现播放</param>         /// <param name="pUsrData">传入码流数据 回调函数作为参数</param>         /// <returns></returns>         [DllImport(SdkPath, EntryPoint = "IVS_PU_RealPlay")]         public static extern uint IVS_PU_RealPlay(uint ulIdentifyID, PU_REAL_PLAY_INFO_S[] pstRealPlayInfo, PfRealDataCallBack fRealDataCallBack, ref IntPtr pUsrData);          public delegate void PfRealDataCallBack(IntPtr szBuffer, int lSize, IntPtr pUsrData);         /// <summary>         /// 停止实时预览         /// </summary>         /// <param name="ulIdentifyId">登录成功后返回的用户编号</param>         /// <param name="ulRealHandle">实时播放句柄</param>         /// <returns></returns>         [DllImport(SdkPath, EntryPoint = "IVS_PU_StopRealPlay", CharSet = CharSet.Ansi, SetLastError = true, PreserveSig = true, CallingConvention = CallingConvention.StdCall)]         public static extern uint IVS_PU_StopRealPlay(uint ulIdentifyId, uint ulRealHandle);         #endregion          #region 错误信息相关          /// <summary>         /// 获取最后一次错误代码         /// </summary>         /// <returns></returns>         [DllImport(SdkPath, EntryPoint = "IVS_PU_GetLastError", CharSet = CharSet.Ansi, SetLastError = true, PreserveSig = true, CallingConvention = CallingConvention.StdCall)]         private static extern int IVS_PU_GetLastError();          /// <summary>         /// 根据错误代码返回错误信息         /// </summary>         /// <param name="ulErrorNo">错误编号</param>         /// <returns></returns>         [DllImport(SdkPath, EntryPoint = "IVS_PU_GetErrorMsg", CharSet = CharSet.Ansi, SetLastError = true, PreserveSig = true, CallingConvention = CallingConvention.StdCall)]         private static extern IntPtr IVS_PU_GetErrorMsg(int ulErrorNo);          /// <summary>         /// 返回最后一次错误码和错误信息         /// </summary>         /// <returns></returns>         public static string GetLastErrorInfo()         {             var lastErrorCode = IVS_PU_GetLastError();             var lastErrorMsg = Marshal.PtrToStringAnsi(IVS_PU_GetErrorMsg(lastErrorCode));              return $"错误码：{IVS_PU_GetLastError()}，错误信息：{lastErrorMsg}";         }          #endregion                  #region 退出登录          /// <summary>         /// 退出登录         /// </summary>         /// <param name="ulIdentifyId">登录成功后返回的句柄编号</param>         /// <returns></returns>         [DllImport(SdkPath, EntryPoint = "IVS_PU_Logout", CharSet = CharSet.Ansi, SetLastError = true, PreserveSig = true, CallingConvention = CallingConvention.StdCall)]         public static extern bool IVS_PU_Logout(uint ulIdentifyId);         /// <summary>         /// 反注册设备，退出时进行设备释放         /// </summary>         /// <returns></returns>         [DllImport(SdkPath, EntryPoint = "IVS_PU_Cleanup", CharSet = CharSet.Ansi, SetLastError = true, PreserveSig = true, CallingConvention = CallingConvention.StdCall)]         public static extern bool IVS_PU_Cleanup();          #endregion      } }

 在MainWindow.cs中我们需要定义一些变量：

        private uint _ulIdentifyId;//登录摄像头后返回的编号         private uint _ulRealHandleId;//调用预览SDK返回的结果值         private static bool _isSave;//是否保存当前帧为图片         private static bool _isExit;//是否退出
        private static HuaWeiSdkHelper.PfRealDataCallBack _fedRealPlayCallbackWithYUV;//手动处理摄像头回调时的委托事件
        private const uint ByteLength = 1920 * 1080 * 4;//位图的大小         private static readonly VideoYuvModelView VideoYuvModelView = new VideoYuvModelView();//Image的数据源，用来手动处理视频时候展示图像         private IntPtr _videoPlayHandle = IntPtr.Zero;//自动预览时的控件句柄          [DllImport("kernel32.dll")]         private static extern void CopyMemory(IntPtr destination, IntPtr source, uint length);//用来复制内存中的数据

在窗体初始化和加载事件中，我们来初始化一些数据的绑定

public MainWindow()         {             InitializeComponent();             VideoYuvModelView.VideoWriteableBitmap = new WriteableBitmap(1920, 1800, 96.0, 96.0, PixelFormats.Bgr32, null);//因为摄像头返回的图片大小时1920*1080，所以这里定义的大小要和返回的图片大小一致         }          private void MainWindow_OnLoaded(object sender, RoutedEventArgs e)         {             CanvaVideo.DataContext = VideoYuvModelView;//手动处理时，Image控件数据源             _videoPlayHandle = ImagePlay.Handle;//自动处理时，使用Winform的控件句柄         }

预览摄像头按钮事件，中间根据选中的自动处理和手动处理来分别做出不同的相应

#region 视频预览（自动和手动处理视频流）          private void ButtonView_OnClick(object sender, RoutedEventArgs e)         {             if (0 == _ulIdentifyId)             {
                //这里通过网络登录到摄像头，具体端口、用户名、密码请参考开发手册                 HuaWeiSdkHelper.InitAndLogin("192.168.2.250", 6060, "ApiAdmin", "HuaWei123", out _ulIdentifyId, out string errMsg);                  if (0 == _ulIdentifyId)                 {                     MessageBox.Show(errMsg);                     return;                 }             }             var prpInfos = new PU_REAL_PLAY_INFO_S[1];             var clientInfo = new PU_REAL_PLAY_INFO_S             {                 ulChannelId = 101,                 hPlayWnd = _videoPlayHandle,                 enProtocolType = PU_PROTOCOL_TYPE.PU_PROTOCOL_TYPE_TCP,                 enStreamType = PU_STREAM_TYPE.PU_VIDEO_MAIN_STREAM,                 enVideoType = PU_VIDEO_TYPE.PU_VIDEO_TYPE_VIDEO,                 enMediaCryptoType = PU_MEDIA_CRYPTO_TYPE.PU_MEDIA_CRYPTO_NONE,                 enMediaCallbackType = PU_MEDIA_CALLBACK_TYPE.PU_MEDIA_CALLBACK_TYPE_RTP,                 szReserved = new byte[32],                 bKeepLive = true             };              IntPtr pUsrData = (IntPtr)_ulIdentifyId;             if (RadioButtonManual.IsChecked == true)             {                 //手动处理视频预览                 FormsHostVideo.Visibility = Visibility.Collapsed;                 CanvaVideo.Visibility = Visibility.Visible;                 clientInfo.hPlayWnd = IntPtr.Zero;                 clientInfo.enMediaCallbackType = PU_MEDIA_CALLBACK_TYPE.PU_MEDIA_CALLBACK_TYPE_YUV;                 prpInfos[0] = clientInfo;                 _fedRealPlayCallbackWithYUV = FedRealPlayCallbackWithYUV; //手动处理回调                 _ulRealHandleId = HuaWeiSdkHelper.IVS_PU_RealPlay(_ulIdentifyId, prpInfos, _fedRealPlayCallbackWithYUV, ref pUsrData);                 if (0 == _ulRealHandleId)                 {                     MessageBox.Show(HuaWeiSdkHelper.GetLastErrorInfo());                 }                  ButtonSaveOne.IsEnabled = true;//点击 抓拍一张 按钮，会把_isSave变量设置为true，从而在回调事件中可以保存当前帧为图片             }             else             {
                ButtonSaveOne.IsEnabled = false;                 CanvaVideo.Visibility = Visibility.Collapsed;                 FormsHostVideo.Visibility = Visibility.Visible;                 prpInfos[0] = clientInfo;                 //传入句柄，自动预览                 _ulRealHandleId = HuaWeiSdkHelper.IVS_PU_RealPlay(_ulIdentifyId, prpInfos, null, ref pUsrData);                 if (0 == _ulRealHandleId)                 {                     MessageBox.Show(HuaWeiSdkHelper.GetLastErrorInfo());                 }             }         }          #region 手动解析YUV数据并展示在界面上         private static void FedRealPlayCallbackWithYUV(IntPtr szBuffer, int lSize, IntPtr pUsrData)         {             if (_isExit) return;             try             {                  Span<byte> nativeSpan;                 unsafe                 {                     nativeSpan = new Span<byte>(szBuffer.ToPointer(), lSize);                 }                  if (nativeSpan.Length > 0)                 {                     #region 处理视频流YUV图像                      Mat yuvImg = new Mat(1080 * 3 / 2, 1920, MatType.CV_8UC1);                     Mat rgbImg = new Mat(1080, 1920, MatType.CV_8UC4);                      Marshal.Copy(nativeSpan.ToArray(), 0, yuvImg.Data, nativeSpan.Length);                     Cv2.CvtColor(yuvImg, rgbImg, ColorConversionCodes.YUV2RGBA_I420);                     Application.Current.Dispatcher?.InvokeAsync(() =>                     {                         VideoYuvModelView.VideoWriteableBitmap.Lock();                         unsafe                         {                             CopyMemory(VideoYuvModelView.VideoWriteableBitmap.BackBuffer, new IntPtr(rgbImg.DataPointer), ByteLength);                         }                         VideoYuvModelView.VideoWriteableBitmap.AddDirtyRect(new Int32Rect(0, 0, 1920, 1080));                         VideoYuvModelView.VideoWriteableBitmap.Unlock();                     });                      if (_isSave)                     {                         Cv2.ImWrite(Path.Combine($"{AppDomain.CurrentDomain.BaseDirectory}", "jpg",$"{Guid.NewGuid()}.jpg"), rgbImg);                         _isSave = false;                     }                      #endregion                 }             }             catch (Exception e)             {                 App.NewNLog.Error($"解析视频流出错：{e}");             }         }         #endregion          #endregion

在程序关闭的时候进行资源释放。

        private void MainWindow_OnClosed(object sender, EventArgs e)         {             _isExit = true;if (_ulRealHandleId > 0)             {                 HuaWeiSdkHelper.IVS_PU_StopRealPlay(_ulIdentifyId, _ulRealHandleId);//停止预览             }             if (_ulIdentifyId > 0)             {                 HuaWeiSdkHelper.IVS_PU_Logout(_ulIdentifyId);//退出登录             }             HuaWeiSdkHelper.IVS_PU_Cleanup();//SDK资源释放         }

具体效果如下：

1、自动预览

使用C#对华为IPC摄像头二次开发（一）

2、手动处理

使用C#对华为IPC摄像头二次开发（一）

但是这里的YUV回调填充到WriteableBitmap遇到个问题，就是无法填满WriteableBitmap（把WriteableBitmap中的数据保存下来也是和预览的效果一样，估计是填充的算法不对），只能填充一部分，这里涉及到本人的知识盲区，暂时没法解决掉。

3、一帧图像保存为本地图片

使用C#对华为IPC摄像头二次开发（一）

使用C#对华为IPC摄像头二次开发（一）

 

 

至此我们使用C#初步实现了华为IPC摄像头的预览和数据流处理（也可以把处理类型换成视频流，然后存本地视频文件，因为默认时h265编码格式，播放时使用PotPlayer播放器来播放），算是入门了。

下一章我们将实现调用SDK来实现人脸自动抓拍效果。

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