在C# WinForm中使用DirectX播放视频

using System;
using System.Windows.Forms;
using DirectShowLib;

namespace DirectXVideoPlayer
{
    public partial class MainForm : Form
    {
        private FilterGraph filterGraph;
        private IVideoWindow videoWindow;
        private IMediaControl mediaControl;

        public MainForm()
        {
            InitializeComponent();
        }

        private void MainForm_Load(object sender, EventArgs e)
        {
            // 创建FilterGraph对象
            filterGraph = new FilterGraph() as FilterGraph;

            // 枚举视频设备
            DsDevice[] videoDevices = DsDevice.GetDevicesOfCat(FilterCategory.VideoInputDevice);
            if (videoDevices.Length == 0)
            {
                MessageBox.Show("未找到可用的视频设备！");
                return;
            }

            // 创建视频捕获过滤器
            IBaseFilter videoCaptureFilter = null;
            Guid videoDeviceGuid = videoDevices[0].DevicePathGuid;
            filterGraph.AddSourceFilterForMoniker(videoDevices[0].Mon, null, videoDevices[0].Name, out videoCaptureFilter);

            // 创建视频渲染过滤器
            IBaseFilter videoRendererFilter = new VideoRendererDefault() as IBaseFilter;

            // 连接过滤器
            filterGraph.ConnectDirect(GetPin(videoCaptureFilter, "Capture"), GetPin(videoRendererFilter, "Input"), null);

            // 获取视频窗口接口
            videoWindow = filterGraph as IVideoWindow;
            videoWindow.Owner = panel1.Handle;
            videoWindow.WindowStyle = WS_CHILD | WS_CLIPCHILDREN;

            // 获取媒体控制接口
            mediaControl = filterGraph as IMediaControl;
        }

        private IPin GetPin(IBaseFilter filter, string pinName)
        {
            IEnumPins enumPins;
            filter.EnumPins(out enumPins);

            IPin[] pins = new IPin[1];
            IntPtr fetched = IntPtr.Zero;
            while (enumPins.Next(1, pins, fetched) == 0)
            {
                PinInfo pinInfo;
                pins[0].QueryPinInfo(out pinInfo);
                bool found = pinInfo.name.Contains(pinName);
                DsUtils.FreePinInfo(pinInfo);

                if (found)
                    return pins[0];
            }

            return null;
        }

        private void btnPlay_Click(object sender, EventArgs e)
        {
            // 播放视频
            mediaControl.Run();
        }

        private void btnStop_Click(object sender, EventArgs e)
        {
            // 停止播放
            mediaControl.Stop();
        }
    }
}