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  • 使用C#对华为IPC摄像头二次开发

    使用C#对华为的摄像头二次开发,摄像头是IPC摄像头。

    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,因为要操作内存,所以要打开允许非安全代码(项目属性==》生成==》勾选允许不安全代码)

    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

    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

    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:

    详细的xaml代码:

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    <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>
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    在App.cs中定义下日志记录类

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        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");
            }
        }
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    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)

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    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;
        }
    }
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    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
        }
    }
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    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
        }
    }
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    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
        }
    }
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    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
        }
    }
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    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>
            ////// </summary>
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 5)]
            public string szYear;
            /// <summary>
            ////// </summary>
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 3)]
            public string szMonth;
            /// <summary>
            ////// </summary>
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 3)]
            public string szDay;
            /// <summary>
            ////// </summary>
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 3)]
            public string szHour;
            /// <summary>
            ////// </summary>
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 3)]
            public string szMinute;
            /// <summary>
            ////// </summary>
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 3)]
            public string szSecond;
        }
    }
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    定义一个静态类,用来实现调用SDK和摄像头交互(HuaWeiSDKHelper)

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    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
    
        }
    }
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    定义一个继承了INotifyPropertyChanged的Model,用来实现刷新Image控件

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        public class VideoYuvModelView : INotifyPropertyChanged
        {
            public event PropertyChangedEventHandler PropertyChanged;
    
            private WriteableBitmap bitmapImage { get; set; }
    
            public WriteableBitmap VideoWriteableBitmap
            {
                get => bitmapImage;
                set
                {
                    bitmapImage = value;
                    PropertyChanged?.Invoke(this,new PropertyChangedEventArgs("VideoBitmapImage"));
                }
            }
        }
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    在MainWindow.cs中我们需要定义一些变量:

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            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
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    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

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    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
            }
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    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

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    #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_8UC1); 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
    复制代码

    在程序关闭的时候进行资源释放。

    复制代码
            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
            }
    复制代码

    具体效果如下:

    1、自动预览

    2、手动处理

    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

    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。

    =======================================================================================

    上一篇我们实现了用SDK登录摄像头并实现预览,这次我们实现通过SDK调用摄像头本身自带的人脸抓拍功能。

    因为篇幅较短,这里直接上代码。

    首先我们在MainWindow代码里定义一个安全队列用来存储抓拍到的人脸数据,一个定时取队列数据的定时器,一个人脸抓拍回调事件

            private static ConcurrentQueue<CaptureInfo> _concurrentQueue = new ConcurrentQueue<CaptureInfo>();
            private static HuaWeiSdkHelper.PfRealDataCallBack _fedRealPlayCallbackFaceCapture;
            private Timer _timer;

    在窗体加载事件中初始化定时器,用来把抓拍到的数据保存到本地

    复制代码
            private void MainWindow_OnLoaded(object sender, RoutedEventArgs e)
            {
    //上一篇文章中的代码省略 _timer
    = new Timer(300) { Enabled = false }; _timer.Elapsed += Timer_Elapsed; }
    复制代码

    SDK定义了人脸捕获需要定义的Struct和Enum

    复制代码
    namespace HuaWeiCamera.Struct
    {
        /// <summary>
        /// 元数据获取相关参数
        /// </summary>
        [StructLayout(LayoutKind.Sequential)]
        public struct PU_META_DATA
        {
            /// <summary>
            /// 数据容量
            /// </summary>
            public ushort usCapacity;
            /// <summary>
            /// 有效数目
            /// </summary>
            public ushort usValidNumber;
            /// <summary>
            /// 参考PU_UserData 定义
            /// </summary>
            public System.IntPtr pstMetaUserData;
        }
    }
    复制代码
    复制代码
    namespace HuaWeiCamera.Struct
    {
        /// <summary>
        /// 元数据用户数据
        /// </summary>
        [System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential, Pack = 1)]
        public struct PU_UserData
        {
            /// <summary>
            /// 元数据类型
            /// </summary>
            public LAYER_THREE_TYPE eType;
            /// <summary>
            /// 用户元数据详情
            /// </summary>
            public PU_UserData_unMetadata Union1;
        }
    }
    复制代码
    复制代码
    namespace HuaWeiCamera.Struct
    {
        /// <summary>
        /// 用户元数据详情
        /// </summary>
        [System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Explicit)]
        public struct PU_UserData_unMetadata
        {
            [System.Runtime.InteropServices.FieldOffset(0)]
            public int bBoolValue;
    
            [System.Runtime.InteropServices.FieldOffset(0)]
            public byte charValue;
    
            [System.Runtime.InteropServices.FieldOffset(0)]
            public byte ucharValue;
    
            [System.Runtime.InteropServices.FieldOffset(0)]
            public short shortValue;
    
            [System.Runtime.InteropServices.FieldOffset(0)]
            public ushort ushortValue;
    
            [System.Runtime.InteropServices.FieldOffset(0)]
            public int IntValue;
    
            [System.Runtime.InteropServices.FieldOffset(0)]
            public uint uIntValue;
    
            [System.Runtime.InteropServices.FieldOffset(0)]
            public long longlongValue;
    
            [System.Runtime.InteropServices.FieldOffset(0)]
            public ulong uLonglongValue;
            /// <summary>
            /// 元数据二进制颜色
            /// </summary>
            [System.Runtime.InteropServices.FieldOffset(0)]
            public ST_BINARY stBinay;
            /// <summary>
            /// 元数据矩形
            /// </summary>
            [System.Runtime.InteropServices.FieldOffset(0)]
            public META_RECT_S stRec;
            /// <summary>
            /// 元数据划点
            /// </summary>
            [System.Runtime.InteropServices.FieldOffset(0)]
            public META_POINT_S stPoint;
            /// <summary>
            /// 元数据划线
            /// </summary>
            [System.Runtime.InteropServices.FieldOffset(0)]
            public META_LINE_S stLine;
    
            [System.Runtime.InteropServices.FieldOffset(0)]
            public IntPtr stPolyGon;
    
            [System.Runtime.InteropServices.FieldOffset(0)]
            public IntPtr stColor;
    
            [System.Runtime.InteropServices.FieldOffset(0)]
            public IntPtr stHumanAttr;
            /// <summary>
            /// 人脸信息
            /// </summary>
            [System.Runtime.InteropServices.FieldOffset(0)]
            public META_FACE_INFO stFaceInfo;
            /// <summary>
            /// 人脸属性
            /// </summary>
            [System.Runtime.InteropServices.FieldOffset(0)]
            public META_FACE_ATTRIBUTES stFaceAttr;
    
            [System.Runtime.InteropServices.FieldOffset(0)]
            public IntPtr szUserData;
        }
    }
    复制代码
    复制代码
    namespace HuaWeiCamera.Enums
    {
        /// <summary>
        /// 元数据类型以《全网智能接口对接TLV数据详解文档为准》
        /// 下载链接:https://support.huawei.com/enterprise/zh/doc/EDOC1100084903
        /// </summary>
        public enum LAYER_THREE_TYPE
        {
            /// <summary>
            /// 时间戳
            /// </summary>
            PTS = 0x09000001,
            /// <summary>
            /// 处理图片宽
            /// </summary>
            IMG_WIDTH = 0x07000100,
            /// <summary>
            /// 处理图片高
            /// </summary>
            IMG_HEIGHT = 0x07000101,
    
            // 人脸
            /// <summary>
            /// 人脸ID
            /// </summary>
            FACE_ID = 0x07000016, 
            /// <summary>
            /// 人脸全景图片大小
            /// </summary>
            FACE_PANOPIC_SIZE = 0x07000018, 
            /// <summary>
            /// 人脸抠图产生时间
            /// </summary>
            FACE_PIC_TIME = 0x08000015, 
            /// <summary>
            /// 人脸抠图设备时区(单位ms 东区为+ 西区为-)
            /// </summary>
            FACE_PIC_TZONE = 0x08000020,
            /// <summary>
            /// 人体属性(不建议使用,使用0X070003xx开始的单个人体属性代替)
            /// </summary>
            HUMAN_FEATURE = 0x10000002,
            /// <summary>
            /// 人脸属性(不建议使用,使用0X070002xx开始的单个人脸属性代替)
            /// </summary>
            FACE_FEATURE = 0x11000003,
            /// <summary>
            /// 全景图片
            /// </summary>
            PANORAMA_PIC = 0x0A00000A,
            /// <summary>
            /// 人脸抠图
            /// </summary>
            FACE_PIC = 0x0A000012,
            /// <summary>
            /// 人脸抠图kps质量过滤标志位
            /// </summary>
            FACE_PIC_KPS = 0x07000012,
            /// <summary>
            /// 人体抠图
            /// </summary>
            HUMAN_PIC = 0x0A000013,
            /// <summary>
            /// 人体抠图kps质量过滤标志位
            /// </summary>
            HUMAN_PIC_KPS = 0x07000013,
            /// <summary>
            /// 人体抠图中的人体目标框
            /// </summary>
            HUMAN_PIC_ROI = 0x0B000017,
            /// <summary>
            /// 人脸全景
            /// </summary>
            FACE_PANORAMA = 0x0A000017,
            /// <summary>
            /// 人脸抠图小框位置
            /// </summary>
            FACE_PIC_POSITION = 0x0B000011,
            /// <summary>
            /// 人脸位置(实时位置框, 万分比) (开始支持版本:SDC V500R019C30)
            /// </summary>
            FACE_POS = 0x0B000012,
            /// <summary>
            /// 人脸数据库中匹配图片
            /// </summary>
            FACE_MATCH = 0x0A000014,
            /// <summary>
            /// 名单库中的人脸ID,用来维持特征 record的一致性
            /// </summary>
            FACELIB_RECORDID = 0x07000017,
            /// <summary>
            /// 人脸匹配率
            /// </summary>
            FACE_MATCHRATE = 0x07000020,
            /// <summary>
            /// 人脸信息,对应数据库中信息
            /// </summary>
            FACE_INFO = 0x12000001,
            /// <summary>
            /// 名单库类型
            /// </summary>
            FACE_LIB_TYPE = 0x07000022,
            /// <summary>
            /// 名单库名字
            /// </summary>
            FACE_LIB_NAME = 0x0A000015,
            /// <summary>
            /// target类型,所有智能的业务类型(开始支持版本:SDC V500R019C30)
            /// </summary>
            TARGET_TYPE = 0x07000023,
    
    
            /// <summary>
            /// 人脸属性, 以FACE开头 0 表示未知 1~n依次对应注释的属性
            /// 眼镜{无,有} 
            /// </summary>
            FACE_GLASS = 0X07000200, 
            /// <summary>
            /// 性别{女,男} 
            /// </summary>
            FACE_GENDER = 0X07000201,
            /// <summary>
            /// 年龄,具体的年龄值1~99 
            /// </summary>
            FACE_AGE = 0X07000202,
            /// <summary>
            /// 遮档(口罩) {无,是} 
            /// </summary>
            FACE_MOUTHMASK = 0X07000203,
            /// <summary>
            /// 人脸表情{微笑、愤怒、悲伤、正常、惊讶}
            /// </summary>
            FACE_EXPRESSION = 0X07000204,
            /// <summary>
            /// 帽子{无, 有}
            /// </summary>
            FACE_HAT = 0X07000205,
            /// <summary>
            /// 胡子{无, 有} (支持版本:SDC 8.0.1)
            /// </summary>
            FACE_MUSTACHE = 0X07000206,
            /// <summary>
            /// 发型{长, 短}(支持版本:SDC 8.0.1)
            /// </summary>
            FACE_HAIR = 0X07000207,
            /// <summary>
            /// 眼镜{无,普通眼镜,太阳眼镜} (开始支持版本:SDC 8.0.1)
            /// </summary>
            FACE_GLASS_TYPE = 0X07000208,
    
            /// <summary>
            /// 人体属性类 以HUMAN开头 0 表示未知 1~n依次对应注释的属性
            /// 年龄 {少年,青年,老年} 
            /// </summary>
            HUMAN_AGE = 0X07000300,
            /// <summary>
            /// 性别{男,女}
            /// </summary>
            HUMAN_GENDER = 0X07000301,
            /// <summary>
            /// 上衣款式 {长袖,短袖}
            /// </summary>
            HUMAN_UPPERSTYLE = 0X07000302,
            /// <summary>
            /// 上衣颜色 {黑,蓝,绿,白/灰,黄/橙/棕,红/粉/紫}
            /// </summary>
            HUMAN_UPPERCOLOR = 0X07000303,
            /// <summary>
            /// 上衣纹理 {纯色,条纹,格子}
            /// </summary>
            HUMAN_UPPERTEXTURE = 0X07000304,
            /// <summary>
            /// 下衣款式 {长裤,短裤,裙子} 
            /// </summary>
            HUMAN_LOWSTYLE = 0X07000305,
            /// <summary>
            /// 下衣颜色 {黑,蓝,绿,白/灰,黄/橙/棕,红/粉/紫}  
            /// </summary>
            HUMAN_LOWERCOLOR = 0X07000306,
            /// <summary>
            /// 体型{standard, fat, thin}
            /// </summary>
            HUMAN_SHAPE = 0X07000307,
            /// <summary>
            /// 口罩{no,yes} 
            /// </summary>
            HUMAN_MOUTHMASK = 0X07000308,
            /// <summary>
            /// 发型{ long, short }
            /// </summary>
            HUMAN_HAIR = 0X07000309,
            /// <summary>
            /// 背包{no,yes} 
            /// </summary>
            HUMAN_BACKPACK = 0X0700030A,
            /// <summary>
            /// 是否拎东西{no,yes}
            /// </summary>
            HUMAN_CARRY = 0X0700030B,
            /// <summary>
            /// 斜挎包{no,yes}
            /// </summary>
            HUMAN_SATCHEL = 0X0700030C,
            /// <summary>
            /// 雨伞{no,yes}
            /// </summary>
            HUMAN_UMBRELLA = 0X0700030D,
            /// <summary>
            /// 前面背包{no,yes}
            /// </summary>
            HUMAN_FRONTPACK = 0X0700030E,
            /// <summary>
            /// 行李箱{no,yes} 
            /// </summary>
            HUMAN_LUGGAGE = 0X0700030F,
            /// <summary>
            /// 行进方向{forward,backward}
            /// </summary>
            HUMAN_DIRECT = 0X07000310,
            /// <summary>
            /// 行进速度{slow,fast}
            /// </summary>
            HUMAN_SPEED = 0X07000311,
            /// <summary>
            /// 朝向{frontal, back, leftprofiled, rightprofiled}
            /// </summary>
            HUMAN_VIEW = 0X07000312,
            /// <summary>
            /// 眼镜{no,glass, sunglass}
            /// </summary>
            HUMAN_GLASS = 0X07000313,
            /// <summary>
            /// 戴帽子{no, yes}
            /// </summary>
            HUMAN_HAT = 0X07000314,
    
            
            /// <summary>
            /// 非机动车属性类 以RIDERMAN开头 0 表示未知 1~n依次对应注释的属性
            /// </summary>
            RIDERMAN_AGE = 0X07000400, // 年龄 {少年,青年,老年}   
            RIDERMAN_GENDER = 0X07000401, // 性别{男,女}     
            RIDERMAN_UPPERSTYLE = 0X07000402, // 上衣款式 {长袖,短袖}        
            RIDERMAN_UPPERCOLOR = 0X07000403, // 上衣颜色 {黑,蓝,绿,白/灰,黄/橙/棕,红/粉/紫}        
            RIDERMAN_HELMET = 0X07000404, // 是否戴头盔 {no, yes} 
            RIDERMAN_HELMETCOLOR = 0X07000405, // 头盔颜色 {黑,蓝,绿,白/灰,黄/橙/棕,红/粉/紫} 
            APPROACH_LANE_ID = 0x07000605, // 临近车道号(开始支持版本:SDC 8.0.1)
    
            // 人体
            HUMAN_RECT = 0x0B000013,           // 人体位置(实时位置框)
            HUMAN_RECT_POSITION = 0x0B000014,  // 人体抠图小框位置
            SHOULDER_RECT = 0x0B000018, // 头肩位置
            SHOULDER_NUM = 0x06000001, // 头肩个数
            QUEUE_TIME = 0x06000002, // 排队时长
    
            OBJ_ID = 0x07000021,              // 目标ID
            OBJ_STATUS = 0x06000022,          // 目标状态
            OBJ_POS = 0x0B000023,             // 目标位置
            OBJ_TYPE = 0x06000024,            // 目标类型
            OBJ_SPEED = 0x0C000025,           // 目标速度
            OBJ_UPHALF_COLOR = 0x0F000026,    // 目标上半部颜色
            OBJ_DOWNHALF_COLOR = 0x0F000027,  // 目标下半部颜色
            RULE_TYPE = 0x07000031,           // 规则类型
            RULE_LINE_POS = 0x0D000032,       // 规则线位置
            RULE_LINE_DIR = 0x07000033,       // 规则线方向
            RULE_AREA_POS = 0x0E000034,       // 规则框位置
            OBJ_POS_R = 0x0B000035,           // 目标位置(相对位置)
            OBJ_SPEED_R = 0x0C000036,         // 目标速度(相对位置)
            RULE_LINE_POS_R = 0x0D000037,     // 规则线位置(相对位置)
            RULE_AREA_POS_R = 0x0E000038,     // 规则框位置(相对位置)
    
            LANE_ID = 0x07000002,              // 车道号
            TRAFFIC_LIGHT_COLOR_ONE = 0x07000106, // 信号灯 1 颜色
            TRAFFIC_LIGHT_DIREC_ONE = 0x07000107, // 信号灯1方向
            TRAFFIC_LIGHT_COLOR_TWO = 0x07000108, // 信号灯2颜色
            TRAFFIC_LIGHT_DIREC_TWO = 0x07000109, // 信号灯2方向
            TRAFFIC_LIGHT_COLOR_THREE = 0x07000110, // 信号灯3颜色
            TRAFFIC_LIGHT_DIREC_THREE = 0x07000111, // 信号灯3方向
            TRAFFIC_LIGHT_COLOR_FOUR = 0x07000112, // 信号灯4颜色
            TRAFFIC_LIGHT_DIREC_FOUR = 0x07000113, // 信号灯4方向
            VEHICLE_TYPE = 0x07000003,         // 车辆类型
            VEHICLE_TYPE_EXT = 0x07000406, // 车辆类型扩展(开始支持版本:SDC V500R019C50)
            VEHICLE_COLOR = 0x07000004,        // 车辆颜色
            VEHICLE_DIRECTION = 0x07000005,    // 车辆行驶方向
            VEHICLE_POS = 0x0B000005,          // 车辆位置  (万分比,开始支持版本:SDC V500R019C30)
            VEHICLE_POS_ABS = 0x0B000020, // 车辆位置绝对坐标              
            VEHICLE_POS_COM = 0x0B000021, // 车辆位置相对坐标万分比
            PLATE_TYPE = 0x07000006,           // 车牌类型
            PLATE_POS = 0x0B000007,            // 车牌位置(开始支持版本:SDC V500R019C30)
            PLATE_POS_ABS = 0x0B000026, // 车牌位置绝对坐标             
            PLATE_POS_COM = 0x0B000027, // 车牌位置相对坐标万分比 
            PLATE_CHAR = 0x0A000008,           // 车牌字符
            PLATE_PIC = 0x0A000009,            // 车牌抠图(开始支持版本:SDC V500R019C60)
            PLATE_BMP_BIT = 0x0A00000B, // 车牌二值图(开始支持版本:SDC 8.0.1)
            PLATE_BMP_BYTE = 0x0A00000C, // 车牌BMP图(开始支持版本:SDC 8.0.1)    
            PLATE_CONFIDENCE = 0x07000061,     // 车牌置信度(开始支持版本:SDC V500R019C60)
            PLATE_COLOR = 0x07000062,          // 车牌颜色
            PLATE_SNAPSHOT_TYPE = 0x07000066,  // 车牌抓拍类型
            VEHICLE_PIC = 0x0A000067,          // 车辆特写图(开始支持版本:SDC V500R019C30)
            FACE_FEATURE_PIC = 0x0A000068, // 行人闯红灯人脸特写图(开始支持版本:SDC 8.0.1)
            PIC_SNAPSHOT_TIMEMS = 0x09000003,  // 抓拍时间(单位ms)(开始支持版本:SDC V500R019C50)
            PIC_SNAPSHOT_TIME = 0x07000068,    // 抓拍时间
            PIC_SNAPSHOT_TZONE = 0x08000069,   // 设备时区(单位ms 东区为+ 西区为-)
            DEVICE_ID = 0x0A000025,            // 设备编号
            ROID_ID = 0x0A000026,              // 道路编号
            DIR_ID = 0x0A000027,               // 方向编号
            DIR_INFO = 0x0A000028,             // 方向信息
            REGULATION_CODE = 0x0A000029,      // 违章代码字符串(开始支持版本:SDC 8.0.1)
            LANE_DESC = 0x070000B2, // 车道描述(开始支持版本:SDC V500R019C30)
            LANE_DIR_DESC = 0x070000B3, // 车道方向描述(开始支持版本:SDC V500R019C30)
            CAR_DRV_DIR = 0x070000B6, // 车辆行驶方向描述(开始支持版本:SDC V500R019C30)
            RADER_CAR_DIR = 0x070000B7, // 雷达测速方向(开始支持版本:SDC V500R019C30)
            CUR_SNAP_INDEX = 0x070000B8, // 当前抓拍序列号(开始支持版本:SDC V500R019C30)
    
            ITS_COMBINE = 0x01000003, // 违章图片 是否开启合成
            ITS_OSD_PIC_OFFSET = 0x06000037, // ITS 六合一卡口osd导致的车辆位置偏移量,正值表示叠加外侧上边缘,
                                             // 负值表示叠加外侧下边缘(开始支持版本:SDC V500R019C30)
    
            TRAFFIC_STATISTICS = 0x070000A0,                              // 车流量统计参数(开始支持版本:SDC V500R019C30)
            TRAFFIC_STATISTICS_LANE_COUNT = 0x070000A1,                   // 车流量统计车道数量(开始支持版本:SDC V500R019C30)
            TRAFFIC_STATISTICS_LANE_INDEX = 0x070000A2,                   // 车流量统计当前车道(开始支持版本:SDC V500R019C30)
            TRAFFIC_STATISTICS_VEHICLE_COUNT = 0x070000A3,                // 车辆计数(开始支持版本:SDC V500R019C30)
            TRAFFIC_STATISTICS_AVG_SPEED = 0x070000A4,                    // 平均速度(开始支持版本:SDC V500R019C30)
            TRAFFIC_STATISTICS_LANE_TIME_USED_RATIO = 0x070000A5,         // 车道时间占有率(开始支持版本:SDC V500R019C30)
            TRAFFIC_STATISTICS_VEHICLE_DENSITY = 0x070000A6,              // 车流密度(开始支持版本:SDC V500R019C30)
            TRAFFIC_STATISTICS_VEHICLE_HEAD_INTERVAL = 0x070000A7,        // 车头时间间隔(开始支持版本:SDC V500R019C30)
            TRAFFIC_STATISTICS_VEHICLE_HEAD_SPACE_INTERVAL = 0x070000A8,  // 车头间隔(开始支持版本:SDC V500R019C30)
            TRAFFIC_STATISTICS_CONGESTION_DEGREE = 0x070000A9,            // 交通状态(开始支持版本:SDC V500R019C30)
            TRAFFIC_STATISTICS_VEHICLE_TYPE1_COUNT = 0x070000AA,          // 大型车数量(开始支持版本:SDC V500R019C30)
            TRAFFIC_STATISTICS_VEHICLE_TYPE2_COUNT = 0x070000AB,          // 中型车数量(开始支持版本:SDC V500R019C30)
            TRAFFIC_STATISTICS_VEHICLE_TYPE3_COUNT = 0x070000AC,          // 小型车数量(开始支持版本:SDC V500R019C30)
            TRAFFIC_STATISTICS_QUEUE_LENGTH = 0x070000AD,                 // 排队长度(开始支持版本:SDC V500R019C30)
            TRAFFIC_STATISTICS_LANE_SPACE_USED_RATIO = 0x070000AE,        // 车道空间占有率(开始支持版本:SDC V500R019C30)
            ITS_TRAFFIC_LEFT_VEHICLE_COUNT = 0x070000AF,                  //  its左转车数量(开始支持版本:SDC V500R019C30)
            ITS_TRAFFIC_STRAIGHT_VHEICLE_COUNT = 0x070000B0,              //  its直行车数量(开始支持版本:SDC V500R019C30)
            ITS_TRAFFIC_RIGHT_VHEICLE_COUNT = 0x070000B1,                 //  its右转车数量(开始支持版本:SDC V500R019C30)
            TRAFFIC_STATISTICS_CYCLE = 0x070000B9,                 // 车流量统计周期(开始支持版本:SDC V500R019C50)
            TRAFFIC_STATISTICS_NONMOTOR_COUNT = 0x070000C0,               // 非机动车数量(开始支持版本:SDC 8.0.0)
            TRAFFIC_STATISTICS_PEDESTRIAN_COUNT = 0x070000C1,             // 行人数量(开始支持版本:SDC 8.0.0)
            TRAFFIC_STATISTICS_TOTAL_VEHICLE_COUNT = 0x070000C2,          // 断面流量(开始支持版本:SDC 8.0.0)
            VEHICLE_SPEED = 0x07000075,                                   // 车辆速度
            REGULATION_TYPE = 0x07000076,                                 // 违章类型
    
            MFR_MAIN_CALL = 0x06000025,       // 主驾驶打电话(开始支持版本:SDC V500R019C30)
            MFR_MAIN_BELT = 0x06000026,       // 主驾驶安全带(开始支持版本:SDC V500R019C30)
            MFR_VICE_EXIST = 0x06000027,      // 是否有副驾驶(开始支持版本:SDC V500R019C30)
            MFR_VICE_BELT = 0x06000035,       // 副驾驶安全带(开始支持版本:SDC V500R019C30)
            MFR_YEAR_LOG = 0x06000036,        // 年检标(开始支持版本:SDC V500R019C30)
            MFR_MAIN_SUN_VISOR = 0x06000030,  // 主驾驶遮阳板(开始支持版本:SDC V500R019C30)
            MFR_VICE_SUN_VISOR = 0x06000031,  // 副驾驶遮阳板(开始支持版本:SDC V500R019C30)
            MFR_NAP_KIN_BOX = 0x06000032,     // 纸巾盒(开始支持版本:SDC V500R019C30)
            MFR_CAR_PENDANT = 0x06000034,     // 挂件(开始支持版本:SDC V500R019C30)
    
            VEHICLE_BODY_RECT = 0x0B000008,     // 车身位置
            NOMOTOR_BODY_RECT = 0x0B000009,     // 非机动车车身位置
            MOTOR_COLOR = 0X07000600,           // 非机动车颜色 {黑(1),蓝(2),绿(3),白/灰(4),黄/橙/棕(5),红/粉/紫(6)} (开始支持版本:SDC 8.0.1)
            MOTOR_SUNSHADE = 0X07000601,        // 是否有遮阳伞{否(1),是(2)} (开始支持版本:SDC 8.0.1)
            MOTOR_SUNSHADE_COLOR = 0X07000602,  // 遮阳伞颜色 {黑(1),蓝(2),绿(3),白/灰(4),黄/橙/棕(5),红/粉/紫(6)} (开始支持版本:SDC 8.0.1)
            MOTOR_MOTOR_CARRY = 0X07000603,     // 是否有携带物 {否(1),是(2)} (开始支持版本:SDC 8.0.1)
            MOTOR_LICENSE_PLATE = 0X07000604,   // 是否有车牌{否(1),是(2)} (开始支持版本:SDC 8.0.1)
    
            CAR_PRE_BRAND = 0x0A000007,        // 品牌字符 (大  众)(开始支持版本:SDC V500R019C60 )
            CAR_SUB_BRAND = 0x0A000022,        // 子款字符 (桑塔纳)(开始支持版本:SDC V500R019C60 )
            CAR_YEAR_BRAND = 0x0A000024,       // 年款字符 (2011)(开始支持版本:SDC V500R019C60 )
            VHD_OBJ_ID = 0x09000006,           // 机非人ID
            CAR_PRE_BRAND_INDEX = 0x06000028,  // 品牌字符索引 (大  众)(开始支持版本:SDC V500R019C30 )
            CAR_SUB_BRAND_INDEX = 0x06000029,  // 子款字符索引 (桑塔纳)(开始支持版本:SDC V500R019C30 )
    
            /// <summary>
            /// 设备数
            /// </summary>
            DEV_CNT = 0x03000070,
            /// <summary>
            /// 通道号
            /// </summary>
            CHAN_ID = 0x03000071,
    
            /// <summary>
            /// 人群密度检测算法人数
            /// </summary>
            PEOPLE_NUM = 0X07000087,
            /// <summary>
            /// 人群密度检测算法返回框的地址
            /// </summary>
            HEADSHOULDER_POS = 0X0B000088,
            /// <summary>
            /// 人群密度检测算法人群密度
            /// </summary>
            AREARATIO = 0X07000089,
            /// <summary>
            /// 跟踪目标id (开始支持版本:SDC V500R019C30)
            /// </summary>
            TRACK_OBJECT = 0x07000028,
            /// <summary>
            /// 相机通道号(开始支持版本:SDC V500R019C30)
            /// </summary>
            CHANNEL_ID = 0x09000078
        }
    }
    复制代码

    定时器事件中处理捕获到的人脸数据(存为本地图片)

    复制代码
    #region 处理人脸数据
            private void Timer_Elapsed(object sender, ElapsedEventArgs e)
            {
                if (_concurrentQueue.Count == 0)
                {
                    Console.WriteLine(@"暂无人脸图片");
                    return;
                }
    
                if (!_concurrentQueue.TryDequeue(out CaptureInfo face))
                {
                    Console.WriteLine(@"读取队列错误");
                    return;
                }
    
                if (face._dataFacePic != null && face._dataFacePic.Length > 0)
                {
                    Console.WriteLine(@"人脸存储中");
                    Task.Run(async () =>
                    {
                        var saveFaceFile = Path.Combine($"{AppDomain.CurrentDomain.BaseDirectory}", "jpg", $"face_{DateTime.Now:yyyy-MM-dd-HH-mm-ss}.jpg");
    
                        await YuvHelper.Byte2Jpg(face._dataFacePic, saveFaceFile).ConfigureAwait(false);
                    });
                }
    
                if (face._dataFacePanorama != null && face._dataFacePanorama.Length > 0)
                {
                    Console.WriteLine(@"全景图片存储中");
                    Task.Run(async () =>
                    {
                        var savePanoramaFile = Path.Combine($"{AppDomain.CurrentDomain.BaseDirectory}", "jpg", $"Panorama_{DateTime.Now:yyyy-MM-dd-HH-mm-ss}.jpg");
    
                        await YuvHelper.Byte2Jpg(face._dataFacePanorama, savePanoramaFile).ConfigureAwait(false);
                    });
                }
            }
            #endregion
    复制代码

    在人脸捕获按钮事件中启动人脸捕获回调

    复制代码
    #region 人脸捕获
            private void ButtonFace_OnClick(object sender, RoutedEventArgs e)
            {
                if (0 == _ulIdentifyId)
                {
                    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 = IntPtr.Zero,
                    enProtocolType = PU_PROTOCOL_TYPE.PU_PROTOCOL_TYPE_TCP,
                    enStreamType = PU_STREAM_TYPE.PU_VIDEO_MAIN_STREAM,
                    enVideoType = PU_VIDEO_TYPE.PU_VIDEO_TYPE_META,//这里需要设置为视频类型为元数据
                    enMediaCryptoType = PU_MEDIA_CRYPTO_TYPE.PU_MEDIA_CRYPTO_NONE,
                    enMediaCallbackType = PU_MEDIA_CALLBACK_TYPE.PU_MEDIA_CALLBACK_TYPE_META_FRAME,//回调方式为智能元数据
                    bKeepLive = true,
                    szLocalIp = null,
                    szReserved = new byte[32]
                };
                clientInfo.szReserved[22] = 1;//szReserved[22]表示智能分析数据打包格式 0:XML,1:元数据
                prpInfos[0] = clientInfo;
                var loginUserId = _ulIdentifyId;
                IntPtr pUsrData = (IntPtr)loginUserId;
                _fedRealPlayCallbackFaceCapture = FaceCaptureReaplayCallbackWithMetaFrame;
                var ulRealHandleCapture = HuaWeiSdkHelper.IVS_PU_RealPlay(_ulIdentifyId, prpInfos, _fedRealPlayCallbackFaceCapture, ref pUsrData);
                if (0 == ulRealHandleCapture)
                {
                    MessageBox.Show(HuaWeiSdkHelper.GetLastErrorInfo());
                    return;
                }
    
                _timer.Enabled = true;
            }
    
            #region 人脸捕获数据回调
    
            private static void FaceCaptureReaplayCallbackWithMetaFrame(IntPtr szBuffer, int lSize, IntPtr pUsrData)
            {
                var ptrstMetaTargetData = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(PU_META_DATA)));
                try
                {
                    var bRet = HuaWeiSdkHelper.IVS_User_GetMetaData(szBuffer, lSize, LAYER_TWO_TYPE.TARGET, ref ptrstMetaTargetData);
                    if (false == bRet)
                    {
                        return;
                    }
    
                    if ((IntPtr)0 == ptrstMetaTargetData)
                    {
                        return;
                    }
    
                    //将数据从非托管内存块封送到新分配的指定类型的托管对象
                    var pstMetaData = (PU_META_DATA)Marshal.PtrToStructure(ptrstMetaTargetData, typeof(PU_META_DATA));
                    //数据处理
                    if (0 == pstMetaData.usValidNumber)
                    {
                        return;
                    }
    
                    PU_UserData pstMetaUserData = new PU_UserData();
                    int nSizeofPuUserDataInC = Marshal.SizeOf(pstMetaUserData);
                    byte[] dataFacePic = null;//人脸图片,如果捕获到人脸,会转成byte[]数组填充进来
                    byte[] dataFacePanorama = null;//检测到人脸的时候的全景图片
                    var faceFeature = new META_FACE_ATTRIBUTES();//附加的人脸上的数据
                    bool hasFaceFeature = false;
                    int target = 0;
                    for (int uIndex = 0; uIndex < pstMetaData.usValidNumber; ++uIndex)
                    {
                        IntPtr ptr2 = new IntPtr(pstMetaData.pstMetaUserData.ToInt32() + nSizeofPuUserDataInC * uIndex);
                        pstMetaUserData = (PU_UserData)Marshal.PtrToStructure(ptr2, typeof(PU_UserData));//数据转成元用户数据结构
                        switch (pstMetaUserData.eType)
                        {
                            case LAYER_THREE_TYPE.TARGET_TYPE:
                                target = pstMetaUserData.Union1.IntValue;
                                break;
                            case LAYER_THREE_TYPE.FACE_PIC://人脸抠图
                                dataFacePic = new byte[pstMetaUserData.Union1.stBinay.ulBinaryLenth];
                                //使用地址data来获取需要的内存块中的数据
                                Marshal.Copy(pstMetaUserData.Union1.stBinay.pBinaryData, dataFacePic, 0, (int)pstMetaUserData.Union1.stBinay.ulBinaryLenth);
                                break;
                            case LAYER_THREE_TYPE.FACE_PANORAMA://人脸全景
                                dataFacePanorama = new byte[pstMetaUserData.Union1.stBinay.ulBinaryLenth];
                                //使用地址data来获取需要的内存块中的数据
                                Marshal.Copy(pstMetaUserData.Union1.stBinay.pBinaryData, dataFacePanorama, 0, (int)pstMetaUserData.Union1.stBinay.ulBinaryLenth);
                                break;
                            case LAYER_THREE_TYPE.FACE_FEATURE://人脸属性
                                hasFaceFeature = true;
                                faceFeature = pstMetaUserData.Union1.stFaceAttr;
                                break;
                            default:
                                break;
                        }
                    }
                    if ((int)Target.FaceCapture == target)
                    {
                        CaptureInfo info =
                            new CaptureInfo
                            {
                                _dataFacePanorama = dataFacePanorama,
                                _dataFacePic = dataFacePic,
                                _faceFeature = faceFeature,
                                _hasFaceFeature = hasFaceFeature
                            };
                        _concurrentQueue.Enqueue(info);//加入到待处理队列中
                    }
                    HuaWeiSdkHelper.IVS_User_FreeMetaData(out ptrstMetaTargetData);//释放数据占用空间
                }
                catch (Exception e)
                {
                    Console.WriteLine(e);
                    throw;
                }
                finally
                {
                    Marshal.FreeHGlobal(ptrstMetaTargetData);//释放内存
                }
            }
    
            #endregion
            #endregion
    复制代码

    在程序退出时,去释放资源

    复制代码
            private void MainWindow_OnClosed(object sender, EventArgs e)
            {
                _isExit = true;
                if (_timer.Enabled) _timer.Enabled = false;
                if (_ulRealHandleId > 0)
                {
                    HuaWeiSdkHelper.IVS_PU_StopRealPlay(_ulIdentifyId, _ulRealHandleId);
                }
                if (_ulIdentifyId > 0)
                {
                    HuaWeiSdkHelper.IVS_PU_Logout(_ulIdentifyId);
                }
                HuaWeiSdkHelper.IVS_PU_Cleanup();
                VideoFileStream.Close();
            }
    复制代码

    SDK把人脸抓拍注册成功后,摄像头本身带的有人脸识别算法,捕获到人脸后,会把数据回调给注册事件,注册事件中根据回调中给的人脸数据的内存地址取出数据,实例化成C#的数据结构,把图片转换成byte[]写入到队列里,定时处理队列时取出数据写成图片,即完成了摄像头人脸识别抓拍(有的摄像头带人脸比对算法,可直接进行人脸比对)。

    出处: 

     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(二)

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  • 原文地址:https://www.cnblogs.com/mq0036/p/14646479.html
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