C#程序中的DirectShow设计.doc

内容导读： （1）在Visual Studio 2005开发环境中，选择菜单项目/添加引用命令，弹出添加引用对话框。 （2）选择浏览选项卡，通过浏览找到引用quartzDriectShow.dll所在的位-（1）在Visual Studio 2005开发环境中，选择菜单“项目”/“添加引用”命令，弹出“添加引用”对话框。（2）选择“浏览”选项卡，通过浏览找到引用quartzDriectShow.dll所在的位置，并引用到程序中。如图4所示。（3）引入using quartzDriectShow后，在程序中就可以开发相关多媒体程序了。开发人员还可以通过编写自己的过滤器扩展DirectShow多媒体支持。下面是DirectShow组件的接口。l IFilterGraph：过滤通道接口。l IFilterGraph2：增强的IfilterGraph。图4 引用quartzDriectShow组件l IGraphBuilder：最为重用的COM接口，用于手动或者自动构造过滤通道Filter Graph Manager。l IMediaControl：用来控制流媒体（如流的启动和停止暂停等）播放控制接口。l IMediaEvent：播放事件接口，该接口在FilterGraph发生一些事件时用来创建事件的标志信息并传送给应用程序。l IMediaEventEx：扩展播放事件窗口。l IMediaPosition：播放的位置和速度控制接口（控制播放放置只能为设置时间控制方式）。l IMediaSeeking：另一个播放的位置和播放速度控制接口，有较强的位置选择功能设置播放格式。常用的控制播放方式为TIME_FORMAT_MEDIA_TIME，单位100ns；TIME_FORMAT_ FRAME，按帧播放。l IBasicAudio：声音控制接口。l IBasic Video：图像控制接口（波特率、宽度、长度等信息）。l IVideoWindow：显示窗口控制接口（有关播放窗口的一切控制，包括caption显示，窗口位置控制等）。l ISampleGrabber：捕获图像接口（可用于抓图控制）。l IVideoFrameStep：控制单帧播放的接口。注意：使用DirectShow接口编程有3个步骤，初始化接口利用接口中的控制函数使用控制操作释放接口。4使用测试工具GraphEdit测试工具（GraphEdit）所在安装路径为“D:mssdkbinDXUtilsgraphedt.exe”。通过该工具，可以很直观地看到Filter Graph的运行及处理流程，方便进行程序调试。首先运行GraphEdit，执行菜单“File”/“Render Media File”命令，然后选择一个媒体文件；当Filter Graph构建成功后，单击工具栏的【运行】按钮，播放已选择的媒体文件，如图5所示。示例DirectShow技术设计多媒体播放器本示例利用DirectShow技术来实现多媒体播放器。程序运行结果如图6所示网站源代码。图5 GraphEdit测试工具的使用图6 DirectShow技术设计多媒体播放器程序开发步骤如下所示。（1）创建一个项目，命名为27_03，设置默认窗体的Text属性为“多媒体播放器”。（2）在窗体上添加6个Button控件，主要用来操作播放的媒体文件，如图6所示。（3）在窗体上添加一个TrackBar控件，用来显示媒体文件播放的进度。（4）在窗体上添加一个Timer控件，用来计算媒体当前的进度。（5）程序代码如下：using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using quartzDriectShow;namespace _7_03public partial class Form1 : Formpublic Form1()InitializeComponent();/设置常量const int WM_APP = 0x8000;const int WM_GRAPHNOTIFY = WM_APP + 1;内容导读： const int EC_COMPLETE = 0x01; const int WS_CHILD = 0x40000000; const int WS_CLIPCHILDREN = 0x2000000; FilgraphManager m_objFilterGraph = null; IBasicAudio m_objBasicAudio = null; IVideoWindow m_objVid-const int EC_COMPLETE = 0x01;const int WS_CHILD = 0x40000000;const int WS_CLIPCHILDREN = 0x2000000;FilgraphManager m_objFilterGraph = null;IBasicAudio m_objBasicAudio = null;IVideoWindow m_objVidwoWindow = null;IMediaEvent m_objMediaEvent = null;IMediaEventEx m_obnMediaEventEx = null;IMediaPosition m_objMediaPosition = null;IMediaControl m_objMediaControl = null;/枚举enum MediaStatus None, Stopped, Paused, Running ;MediaStatus m_CurrentStatus = MediaStatus.None;private void Clear()if (m_objMediaControl != null)m_objMediaControl.Stop();if (m_obnMediaEventEx != null)m_obnMediaEventEx.SetNotifyWindow(0, 0, 0);if(m_objVidwoWindow!=null)m_objVidwoWindow.Visible = 0;m_objVidwoWindow.Owner = 0;if (m_objBasicAudio != null) m_objBasicAudio = null;if (m_objFilterGraph != null) m_objFilterGraph = null;if (m_objMediaControl != null) m_objMediaControl = null;if (m_objMediaEvent != null) m_objMediaEvent = null;if (m_objMediaPosition != null) m_objMediaPosition = null;if (m_objVidwoWindow != null) m_objVidwoWindow = null;if (m_obnMediaEventEx != null) m_obnMediaEventEx = null;this.Text = 多媒体播放器;timer1.Enabled = False;trackBar1.Value = 0;private void button1_Click(object sender, EventArgs e)OpenFileDialog openFile = new OpenFileDialog();openFile.Filter = 选择播放文件|*.mpg;*.avi;*.mov;*.wma;*.wav;*.mp3|All Files|*.*;if (DialogResult.OK = openFile.ShowDialog()this.Clear();/清理正在播放的文件m_objFilterGraph = new FilgraphManager();trym_objFilterGraph.RenderFile(openFile.FileName);m_objBasicAudio = m_objFilterGraph as IBasicAudio;/图像控制接口m_objVidwoWindow = m_objFilterGraph as IVideoWindow;/声音控制接口m_objVidwoWindow.Owner =(int) this.Handle;/设置窗口类型m_objVidwoWindow.WindowStyle = WS_CHILD | WS_CLIPCHILDREN;/设置播放容器m_objVidwoWindow.SetWindowPosition(this.ClientRectangle.Left, this.ClientRectangle.Top, this. ClientRectangle.Width, this.ClientRectangle.Height-60);catch (Exception ex)MessageBox.Show(ex.Message);/当出错时，为音频文件，将视频对象清空m_objVidwoWindow = null;m_objMediaEvent = m_objFilterGraph as IMediaEvent;/播放事件接口m_obnMediaEventEx = m_objFilterGraph as IMediaEventEx;/扩展播放事件接口m_obnMediaEventEx.SetNotifyWindow(int)this.Handle, WM_GRAPHNOTIFY, 0);m_objMediaPosition = m_objFilterGraph as IMediaPosition;/播放位置和速度控制m_objMediaControl = m_objFilterGraph as IMediaControl;/用来控制流媒体播放控制接口this.Text = openFile.FileName +-+ this.Text;m_objMediaControl.Run();/播放文件trytrackBar1.LargeChange = 1;trackBar1.Maximum = (int)m_objMediaPosition.Duration;timer1.Enabled = True;catch private void button2_Click(object sender, EventArgs e)/播放if (m_objMediaControl!=null)m_objMediaControl.Run();private void button3_Click(object sender, EventArgs e)/暂停m_objMediaControl.Pause();private void button4_Click(object sender, EventArgs e)/停止本教程来自:m_objMediaControl.Stop();m_objMediaPosition.CurrentPosition = 0;this.Clear();private void button5_Click(object sender, EventArgs e)/快退if (m_objMediaPosition.CurrentPosition = 1)m_objMediaPosition.CurrentPosition = m_objMediaPosition.CurrentPosition - 1;elsem_objMediaPosition.CurrentPosition = 0;private void button6_Click(object sender, EventArgs e)/快进m_objMediaPosition.CurrentPosition = m_objMediaPosition.CurrentPosition + 1;private void timer1_Tick(object sender, EventArgs e)/显示文件播放的进度trackBar1.Value = (int)m_objMediaPosition.CurrentPosition;private void trackBar1_Scroll(object sender, EventArgs e)/根据滚动进度条，来播放文件m_objMediaPosition.CurrentPosition = trackBar1.Value;完整程序代码如下： Form1.cs窗体代码文件完整程序代码网站源代码using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using quartzDriectShow;namespace _7_03内容导读： public partial class Form1 : Form public Form1() InitializeComponent(); /设置常量 const int WM_APP = 0x8000; const int WM_GRAPHNOTIFY = WM_APP + 1; const int EC_COMPLETE = 0x01; const int-public partial class Form1 : Formpublic Form1()InitializeComponent();/设置常量const int WM_APP = 0x8000;const int WM_GRAPHNOTIFY = WM_APP + 1;const int EC_COMPLETE = 0x01;const int WS_CHILD = 0x40000000;const int WS_CLIPCHILDREN = 0x2000000;FilgraphManager m_objFilterGraph = null;IBasicAudio m_objBasicAudio = null;IVideoWindow m_objVidwoWindow = null;IMediaEvent m_objMediaEvent = null;IMediaEventEx m_obnMediaEventEx = null;IMediaPosition m_objMediaPosition = null;IMediaControl m_objMediaControl = null;enum MediaStatus None, Stopped, Paused, Running ;MediaStatus m_CurrentStatus = MediaStatus.None;private void Form1_Load(object sender, EventArgs e)private void Clear()if (m_objMediaControl != null)m_objMediaControl.Stop();if (m_obnMediaEventEx != null)m_obnMediaEventEx.SetNotifyWindow(0, 0, 0);if(m_objVidwoWindow!=null)m_objVidwoWindow.Visible = 0;m_objVidwoWindow.Owner = 0;if (m_objBasicAudio != null) m_objBasicAudio = null;if (m_objFilterGraph != null) m_objFilterGraph = null;if (m_objMediaControl != null) m_objMediaControl = null;if (m_objMediaEvent != null) m_objMediaEvent = null;if (m_objMediaPosition != null) m_objMediaPosition = null;if (m_objVidwoWindow != null) m_objVidwoWindow = null;if (m_obnMediaEventEx != null) m_obnMediaEventEx = null;this.Text = 多媒体播放器;timer1.Enabled = false;trackBar1.Value = 0;private void button1_Click(object sender, EventArgs e)OpenFileDialog openFile = new OpenFileDialog();openFile.Filter = 选择播放文件|*.mpg;*.avi;*.mov;*.wma;*.wav;*.mp3|All Files|*.*;if (DialogResult.OK = openFile.ShowDialog()/本教程来自:this.Clear();/清理正在播放的文件m_objFilterGraph = new FilgraphManager();trym_objFilterGraph.RenderFile(openFile.FileName);m_objBasicAudio = m_objFilterGraph as IBasicAudio;/图象控制接口m_objVidwoWindow = m_objFilterGraph as IVideoWindow;/声音控制接口m_objVidwoWindow.Owner =(int) this.Handle;/设置窗口类型m_objVidwoWindow.WindowStyle = WS_CHILD | WS_CLIPCHILDREN;/设置播放容器m_objVidwoWindow.SetWindowPosition(this.ClientRectangle.Left, this.ClientRectangle.Top, this.ClientRectangle.Width, this.ClientRectangle.Height-60);catch (Exception ex)MessageBox.Show(ex.Message);/当出错时，为音频文件，将视频对象清空m_objVidwoWindow = null;m_objMediaEvent = m_objFilterGraph as IMediaEvent;/播放事件接口m_obnMediaEventEx = m_objFilterGraph as IMediaEventEx;/扩展播放事件接口m_obnMediaEventEx.SetNotifyWindow(int)this.Handle, WM_GRAPHNOTIFY, 0);m_objMediaPosition = m_objFilterGraph as IMediaPosition;/播放位置和速度控制m_objMediaControl = m_objFilterGraph as IMediaControl;/用来控制流媒体播放控制接口this.Text = openFile.FileName +-+ this.Text;m_objMediaControl.Run();/播放文件trytrackBar1.LargeChange = 1;trackBar1.Maximum = (int)m_objMediaPosition.Duration;timer1.Enabled = true;catch private void button2_Click(object sender, EventArgs e)/播放if (m_objMediaControl!=null)m_objMediaControl.Run();private void button3_Click(object sender, EventArgs e)/暂停m_objMediaControl.Pause();private void button4_Click(object sender, EventArgs e)/停止m_objMediaControl.Stop();m_objMediaPosition.CurrentPosition = 0;this.Clear();private void button5_Click(object sender, EventArgs e)/快退if (m_objMediaPosition.CurrentPosition = 1)m_objMediaPosition.CurrentPosition = m_objMediaPosition.CurrentPosition - 1;elsem_objMediaPosition.CurrentPosition = 0;private void button6_Click(object sender, EventArgs e)/快进m_objMediaPosition.CurrentPosition = m_objMediaPosition.CurrentPosition + 1;private void timer1_Tick(object sender, EventArgs e)/显示文件播放的进度trackBar1.Value = (int)m_objMediaPosition.CurrentPosition;private void trackBar1_Scroll(object sender, EventArgs e)/根据滚动进度条，来播放文件m_objMediaPosition.CurrentPosition = trackBar1.Value; Form1.Designer.cs窗体设计文件完整程序代码namespace _7_03内容导读： partial class Form1 / summary / 必需的设计器变量。 / /summary private System.ComponentModel.IContainer components = null; / summary / 清理所有正在使用的资源。 / /s-partial class Form1/ / 必需的设计器变量。/ private System.ComponentModel.IContainer components = null;/ / 清理所有正在使用的资源。/ / 如果应释放托管资源，为 true；否则为 tected override void Dispose(bool disposing)if (disposing & (components != null)components.Dispose();base.Dispose(disposing);#region Windows 窗体设计器生成的代码/ / 设计器支持所需的方法 - 不要/ 使用代码编辑器修改此方法的内容。/ private void InitializeComponent()ponents = new System.ComponentModel.Container();this.button1 = new System.Windows.Forms.Button();this.button2 = new System.Windows.Forms.Button();this.button3 = new System.Windows.Forms.Button();this.button4 = new System.Windows.Forms.Button();this.button5 = new System.Windows.Forms.Button();this.button6 = new System.Windows.Forms.Button();this.trackBar1 = new System.Windows.Forms.TrackBar();this.timer1 = new System.Windows.Forms.Timer(ponents);(System.ComponentModel.ISupportInitialize)(this.trackBar1).BeginInit();this.SuspendLayout();/ button1/this.button1.Location = new System.Drawing.Point(7, 254);this.button1.Name = button1;this.button1.Size = new System.Drawing.Size(75, 23);this.button1.TabIndex = 1;this.button1.Text = 打开;this.button1.UseVisualStyleBackColor = true;this.button1.Click += new System.EventHandler(this.button1_Click);/ button2/this.button2.Location = new System.Drawing.Point(88, 254);this.button2.Name = button2;this.button2.Size = new System.Drawing.Size(75, 23);this.button2.TabIndex = 2;this.button2.Text = 播放;this.button2.UseVisualStyleBackColor = true;this.button2.Click += new System.EventHandler(this.button2_Click);/ button3/本教程来自:this.button3.Location = new System.Drawing.Point(331, 254);this.button3.Name = button3;this.button3.Size = new System.Drawing.Size(75, 23);this.button3.TabIndex = 3;this.button3.Text = 暂停;this.button3.UseVisualStyleBackColor = true;this.button3.Click += new System.EventHandler(this.button3_Click);/ button4/this.button4.Location = new System.Drawing.Point(412, 254);this.button4.Name = button4;this.button4.Size = new System.Drawing.Size(75, 23);this.button4.TabIndex = 4;this.button4.Text = 停止;this.button4.UseVisualStyleBackColor = true;this.button4.Click += new System.EventHandler(this.button4_Click);/ button5/this.button5.Location = new System.Drawing.Point(169, 254);this.button5.Name = button5;this.button5.Size = new System.Drawing.Size(75, 23);this.button5.TabIndex = 5;this.button5.Text = 快进;this.button6.UseVisualStyleBackColor = true;this.button6.Click += new System.EventHandler(this.button6_Click);/ trackBar1/this.trackBar1.Cursor = System.Windows.Forms.Cursors.NoMoveHoriz;this.trackBar1.LargeChange = 1;this.trackBar1.Location = new System.Drawing.Point(1, 210);this.trackBar1.Maximum = 50;this.trackBar1.Name = trackBar1;this.trackBar1.Size = new System.Drawing.Size(494, 45);this.trackBar1.TabIndex = 6;this.trackBar1.TickStyle = System.Windows.Forms.TickStyle.Both;this.trackBar1.Value = 1;this.trackBar1.Scroll += new System.EventHandler(this.trackBar1_Scroll);/本教程来自:/ timer1/this.timer1.Interval = 500;this.timer1.Tick += new System.EventHandler(this.timer1_Tick);/ Form1/this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);this.AutoScaleMode = System.Windows.Forms.AutoScaleMod