C#使用 DirectX SDK 9做视频播放器并在视频画线添加文字 VMR9

视频图像处理系列索引

VS2013下测试通过。

在百度中搜索关键字“DirectX SDk”,或者进入微软官网https://www.microsoft.com/en-us/download/details.aspx?id=6812，

下载最新版本的SDK，即DirectX SDK June10

下载后安装。

下载DirectShowLib-2005.dll并引用到工程里。

代码如下：

using DirectShowLib;

using Microsoft.DirectX.Direct3D;
using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
using System.Drawing.Imaging;
using System.IO;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Xml;

namespace VideoConfig
{
    public partial class frmMain : Form
    {private Color colorKey = Color.Violet; // The color use as ColorKey for GDI operations
        private Bitmap alphaBitmap; // A ARGB bitmap used for Direct3D operations

        // Managed Direct3D magic number to retrieve unmanaged Direct3D interfaces
        private const int DxMagicNumber = -759872593;
        private Device device = null; // A Managed Direct3D device
        private PresentParameters presentParams;
        private Surface surface = null; // A Direct3D suface filled with alphaBitmap
        private IntPtr unmanagedSurface; // A pointer on the unmanaged surface

        private IFilterGraph2 graphBuilder = null;
        private IMediaControl mediaControl = null;
        private IBaseFilter vmr9 = null;
        private IVMRMixerBitmap9 mixerBitmap = null;
        private IVMRWindowlessControl9 windowlessCtrl = null;
        private bool handlersAdded = false; // Needed to remove delegates

        public frmMain()
        {
            InitializeComponent();this.SetStyle(ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true);
            // Init Managed Direct3D
            InitializeDirect3D();

            CloseInterfaces();
            BuildGraph(@"F:\测试视频.avi");
            RunGraph();
        }

        private void InitializeDirect3D()
        {
            Device.IsUsingEventHandlers = false;

            // Basic Presentation Parameters...
            presentParams = new PresentParameters();
            presentParams.Windowed = true;
            presentParams.SwapEffect = SwapEffect.Discard;

            // Assume a hardware Direct3D device is available
            // Add MultiThreaded to be safe. Each DirectShow filter runs in a separate thread...
            device = new Device(
                0,
                DeviceType.Hardware,
                this,
                CreateFlags.SoftwareVertexProcessing | CreateFlags.MultiThreaded,
                presentParams
                );

            alphaBitmap = new Bitmap(this.pictureBox1.Width, this.pictureBox1.Height, PixelFormat.Format24bppRgb);

            // Create a surface from our alpha bitmap
            surface = new Surface(device, alphaBitmap, Pool.SystemMemory);
            // Get the unmanaged pointer
            unmanagedSurface = surface.GetObjectByValue(DxMagicNumber);
        }

        private void CloseInterfaces()
        {
            if (mediaControl != null)
                mediaControl.Stop();

            if (handlersAdded)
                RemoveHandlers();

            if (vmr9 != null)
            {
                Marshal.ReleaseComObject(vmr9);
                vmr9 = null;
                windowlessCtrl = null;
                mixerBitmap = null;
            }

            if (graphBuilder != null)
            {
                Marshal.ReleaseComObject(graphBuilder);
                graphBuilder = null;
                mediaControl = null;
            }
        }

        private void RemoveHandlers()
        {
            // remove handlers when they are no more needed
            handlersAdded = false;
            this.pictureBox1.Paint -= new PaintEventHandler(MainForm_Paint);
            this.pictureBox1.Resize -= new EventHandler(MainForm_ResizeMove);
            this.pictureBox1.Move -= new EventHandler(MainForm_ResizeMove);
            this.pictureBox1.MouseDown -= new MouseEventHandler(panel2_MouseDown);
            this.pictureBox1.MouseUp -= new MouseEventHandler(panel2_MouseUp);
            this.pictureBox1.MouseMove -= new MouseEventHandler(panel2_MouseMove);
            SystemEvents.DisplaySettingsChanged -= new EventHandler(SystemEvents_DisplaySettingsChanged);
        }

        private void AddHandlers()
        {
            // Add handlers for VMR purpose
            this.pictureBox1.Paint += new PaintEventHandler(MainForm_Paint); // for WM_PAINT
            this.pictureBox1.Resize += new EventHandler(MainForm_ResizeMove); // for WM_SIZE
            this.pictureBox1.Move += new EventHandler(MainForm_ResizeMove); // for WM_MOVE
            this.pictureBox1.MouseDown += new MouseEventHandler(panel2_MouseDown);
            this.pictureBox1.MouseUp += new MouseEventHandler(panel2_MouseUp);
            this.pictureBox1.MouseMove += new MouseEventHandler(panel2_MouseMove);
            SystemEvents.DisplaySettingsChanged += new EventHandler(SystemEvents_DisplaySettingsChanged); // for WM_DISPLAYCHANGE
            handlersAdded = true;
        }

        private void MainForm_Paint(object sender, PaintEventArgs e)
        {
            if (windowlessCtrl != null)
            {
                IntPtr hdc = e.Graphics.GetHdc();
                int hr = windowlessCtrl.RepaintVideo(this.Handle, hdc);
                e.Graphics.ReleaseHdc(hdc);

                System.Drawing.Pen pen = new System.Drawing.Pen(Color.LimeGreen);
                pen.Width = 2;
//实时的画矩形
                    e.Graphics.DrawRectangle(pen, point1.X, point1.Y, point2.X - point1.X, point2.Y - point1.Y);

                pen.Dispose();
            }
        }

        private void MainForm_ResizeMove(object sender, EventArgs e)
        {
            if (windowlessCtrl != null)
            {
                int hr = windowlessCtrl.SetVideoPosition(null, DsRect.FromRectangle(this.pictureBox1.ClientRectangle));
            }
        }

        private void SystemEvents_DisplaySettingsChanged(object sender, EventArgs e)
        {
            if (windowlessCtrl != null)
            {
                int hr = windowlessCtrl.DisplayModeChanged();
            }
        }

        private void RunGraph()
        {
            if (mediaControl != null)
            {
                int hr = mediaControl.Run();
                DsError.ThrowExceptionForHR(hr);
            }
        }

        private void StopGraph()
        {
            if (mediaControl != null)
            {
                int hr = mediaControl.Stop();
                DsError.ThrowExceptionForHR(hr);
            }
        }

        private void BuildGraph(string fileName)
        {
            int hr = 0;

            try
            {
                graphBuilder = (IFilterGraph2)new FilterGraph();
                mediaControl = (IMediaControl)graphBuilder;

                vmr9 = (IBaseFilter)new VideoMixingRenderer9();

                ConfigureVMR9InWindowlessMode();

                hr = graphBuilder.AddFilter(vmr9, "Video Mixing Renderer 9");
                DsError.ThrowExceptionForHR(hr);

                hr = graphBuilder.RenderFile(fileName, null);
                DsError.ThrowExceptionForHR(hr);

                mixerBitmap = (IVMRMixerBitmap9)vmr9;
            }
            catch (Exception e)
            {
                CloseInterfaces();
                MessageBox.Show("An error occured during the graph building : \r\n\r\n" + e.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void ConfigureVMR9InWindowlessMode()
        {
            int hr = 0;

            IVMRFilterConfig9 filterConfig = (IVMRFilterConfig9)vmr9;

            // Not really needed for VMR9 but don't forget calling it with VMR7
            hr = filterConfig.SetNumberOfStreams(1);
            DsError.ThrowExceptionForHR(hr);

            // Change VMR9 mode to Windowless
            hr = filterConfig.SetRenderingMode(VMR9Mode.Windowless);
            DsError.ThrowExceptionForHR(hr);

            windowlessCtrl = (IVMRWindowlessControl9)vmr9;

            // Set "Parent" window
            hr = windowlessCtrl.SetVideoClippingWindow(this.pictureBox1.Handle);
            DsError.ThrowExceptionForHR(hr);

            // Set Aspect-Ratio
            hr = windowlessCtrl.SetAspectRatioMode(VMR9AspectRatioMode.LetterBox);
            DsError.ThrowExceptionForHR(hr);

            // Add delegates for Windowless operations
            AddHandlers();

            // Call the resize handler to configure the output size
            MainForm_ResizeMove(null, null);
        }



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