用C#写一个获取rpst视频流的程序，能保存录像，能抓拍

在C#中编写一个程序来获取RPS（Real-time Picture Stream）视频流并保存录像以及抓拍图片，你需要用到System.Drawing命名空间来处理图像和Windows Media Foundation (WPF) 或 DirectShow库来处理视频捕获。以下是一个基本的步骤概述：

首先，安装必要的NuGet包，如MediaFoundation和SharpDX.DXGI，用于视频捕捉。

using System;
using System.IO;
using System.Threading.Tasks;
using MediaFoundation;
using SharpDX.MediaFoundation;
using Windows.Storage.Streams;
using Windows.Media.Capture;
using Windows.Graphics.Imaging;

class VideoCaptureApp
{
    private MediaFoundationReader reader;
    private StorageFile outputFile;
    
    public async Task StartCaptureAsync(string deviceID)
    {
        // 初始化媒体源和设备选择
        var devices = await MediaFoundationSource.FindAllSourcesAsync();
        var mediaSource = devices.FirstOrDefault(d => d.Id == deviceID);
        
        // 创建媒体创建者工厂
        var mfcc = new MediaFoundationCreateOptions();
        var mfcFactory = await MFCreate.CreateMfReference(MFObjectType.MediaFoundationVideoControl, mfcc);

        // 使用控制创建器打开媒体源
        reader = await mfcFactory.OpenReaderAsync(mediaSource);
        
        // 创建存储文件用于录像
        outputFile = await ApplicationData.Current.LocalFolder.CreateFileAsync("recording.mp4", CreationCollisionOption.ReplaceExisting);
        await writer.StartWritingAsync(outputFile);

        // 开始实时捕获
        while (true)
        {
            // 获取下一帧
            var frameSample = await reader.ReadSampleAsync();

            if (frameSample != null)
            {
                // 解码并保存视频数据
                using var decoder = new MediaFoundationVideoDecoder(frameSample);
                using var bitmapFrame = await decoder.GetBitmapFrameAsync();

                if (bitmapFrame != null)
                {
                    // 抓拍图片
                    var pixelBuffer = await bitmapFrame.ToPixelBufferAsync(BitmapPixelFormat.Bgra8Unorm, BitmapAlphaMode.Ignore);
                    byte[] imageData = pixelBuffer.ToArray();

                    // 将图片保存到本地
                    var photoStream = await StorageFile.CreateFileForApplicationAsync("capture.jpg", CreationCollisionOption.ReplaceExisting);
                    await FileIO.WriteBytesAsync(photoStream, imageData);
                }

                // 写入视频数据到输出文件
                await writer.WriteSampleAsync(frameSample);
            }
        }
    }
}