C# 实现Windows Media Encoder音视频捕捉

C# 实现Windows Media Encoder音视频捕捉 收藏http://blog.csdn.net/lhfzd2004/archive/2007/08/24/1757410.aspx我的博客中讲述过WMS9，可以实现流媒体服务器，但没有WME（windows media encoder）的支持，总觉得缺少点什么，这里就讲述一下如何通过.net实现WME获取设备视频音频流，并推送到远程（本地当然可以）流媒体广播发布点。一.下载了wme9的SDK，安装完毕：这一步主要体验一下WME能够实现那些功能。读者可以自行安装试试。二.创建.net winform Application，添加引用using WMEncoderLib;WMEncoderLib是一个assemble，通过它，我们可以方便实现WME的操作。三.获取本地屏幕，并转换为视频信号IWMEncSource SrcAud = SrcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_AUDIO); IWMEncSource SrcVid = SrcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_VIDEO); SrcAud.SetInput("Default_Audio_Device", "Device", ""); SrcVid.SetInput("ScreenCapture1", "ScreenCap", "");四.启动Encoder，推送到远程WMS服务器 //Set up the push broadcast. IWMEncPushDistribution PushDist = (IWMEncPushDistribution)Encoder.Broadcast; string strServerName = this.TB_ServerName.Text.Trim() + ":" + this.TB_Port.Text.Trim(); string strPubPoint = "TmpBroadCastPubPoint"; // Remove the publishing point when the broadcast is over. PushDist.AutoRemovePublishingPoint = true; // Set the push distribution variables. PushDist.ServerName = strServerName; PushDist.PublishingPoint = strPubPoint; // PushDist.Template = strPubTemplate; // Initialize the encoding process. Encoder.PrepareToEncode(true);注意：在这里，直接推送到远程服务器，如果服务器不在同一域内，或在不可信任区域，推送时应该会需要验证用户名和密码。因此我们需要创建一个委托：Encoder.OnAcquireCredentials += new _IWMEncoderEvents_OnAcquireCredentialsEventHandler(OnUserAuth);public void OnUserAuth(string bstrRealm, string bstrSite, ref object pvarUser, ref object pvarPassword, ref object plFlags) ...{ pvarUser = "administrator"; pvarPassword = "622316"; plFlags = 4; }五.到这里就差不多了，完整代码贴出来：using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using WMEncoderLib;namespace Project2...{ public partial class Form1 : Form ...{ static bool bDone; private WMEncoder Encoder; public Form1() ...{ InitializeComponent(); Encoder = new WMEncoder(); Encoder.OnStateChange += new _IWMEncoderEvents_OnStateChangeEventHandler(OnWmeStatusChange); Encoder.OnError += new _IWMEncoderEvents_OnErrorEventHandler(Encoder_OnError); Encoder.OnAcquireCredentials += new _IWMEncoderEvents_OnAcquireCredentialsEventHandler(OnUserAuth); } private void Btn_Start_Click(object sender, EventArgs e) ...{ this.StartBroadCast(); } private void Btn_Close_Click(object sender, EventArgs e) ...{ this.StopBroadCast(); } /**////

/// 停止广播服务 ///

public void StopBroadCast() ...{ this.Encoder.Stop(); } /**////

/// 启动广播服务 ///

public void StartBroadCast() ...{ if (Encoder != null) ...{ // Retrieve the source group collection. IWMEncSourceGroupCollection SrcGrpColl = Encoder.SourceGroupCollection; // Add a source group to the collection. IWMEncSourceGroup SrcGrp = SrcGrpColl.Add("SG_2"); IWMEncSource SrcAud = SrcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_AUDIO); IWMEncSource SrcVid = SrcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_VIDEO); SrcAud.SetInput("Default_Audio_Device", "Device", ""); SrcVid.SetInput("ScreenCapture1", "ScreenCap", ""); // Choose a profile from the collection. IWMEncProfileCollection ProColl = Encoder.ProfileCollection; IWMEncProfile Pro; for (int i = 0; i < ProColl.Count; i++) ...{ Pro = ProColl.Item(i); if (Pro.Name == "Windows Media Video 8 for Local Area Network (384 Kbps)") ...{ SrcGrp.set_Profile(Pro); break; } } //Set up the push broadcast. IWMEncPushDistribution PushDist = (IWMEncPushDistribution)Encoder.Broadcast; // Specify the push distribution variables, including the Windows Media // server name, publishing point, and announcement files. string strServerName = this.TB_ServerName.Text.Trim() + ":" + this.TB_Port.Text.Trim(); string strPubPoint = "TmpBroadCastPubPoint"; //string strPubTemplate = "AnotherPubPoint"; //string MyNSCFile = "//localhost/test/MyPubPoint.nsc"; //string MyNSCURL = "//localhost/MyPubPoint.nsc"; //string MyASXFile = @"C:InetpubwwwrootMyPubPoint.asx"; // Remove the publishing point when the broadcast is over. PushDist.AutoRemovePublishingPoint = true; // Set the push distribution variables. PushDist.ServerName = strServerName; PushDist.PublishingPoint = strPubPoint; // PushDist.Template = strPubTemplate; // Initialize the encoding process. Encoder.PrepareToEncode(true); // Generate the announcement file. //PushDist.GenerateMulticastInfoFile(MyNSCFile); //PushDist.GenerateAnnouncementFile(MyNSCURL, MyASXFile); // Start the encoding process. Encoder.Start(); // wmp.openPlayer("mms://LIH-M/test"); this.wmp.URL = "mms://192.168.1.108/TmpBroadCastPubPoint"; } } public void OnUserAuth(string bstrRealm, string bstrSite, ref object pvarUser, ref object pvarPassword, ref object plFlags) ...{ pvarUser = "administrator"; pvarPassword = "622316"; plFlags = 4; } public void Encoder_OnError(int Result) ...{ this.RTB_Error.Text = "运行状态：出错代码 " + Result + " 【" + Encoder.ErrorState.ToString() + "】"; } public void OnWmeStatusChange(WMENC_ENCODER_STATE enumState) ...{ switch (enumState) ...{ case WMENC_ENCODER_STATE.WMENC_ENCODER_RUNNING: RTB_Error.Text += " 运行状态：Encoder正在运行"; break; case WMENC_ENCODER_STATE.WMENC_ENCODER_STOPPED: // TODO: Handle stopped state. bDone = true; RTB_Error.Text += " 运行状态：Encoder已经停止"; break; case WMENC_ENCODER_STATE.WMENC_ENCODER_STARTING: RTB_Error.Text += " 运行状态：Encoder正在启动"; break; case WMENC_ENCODER_STATE.WMENC_ENCODER_PAUSING: // TODO: Handle pausing state. RTB_Error.Text += " 运行状态：Encoder正在暂停"; break; case WMENC_ENCODER_STATE.WMENC_ENCODER_STOPPING: // TODO: Handle stopping state. RTB_Error.Text += " 运行状态：Encoder正在停止"; break; case WMENC_ENCODER_STATE.WMENC_ENCODER_PAUSED: // TODO: Handle paused state. RTB_Error.Text += " 运行状态：Encoder已暂停"; break; case WMENC_ENCODER_STATE.WMENC_ENCODER_END_PREPROCESS: // TODO: Handle end preprocess state. RTB_Error.Text += " 运行状态：Encoder正在处理结束前操作"; break; } } }}WME可以捕捉机器音频和视频等设备，如：摄像头，桌面，光驱，声卡，电视卡等等。因此我们可以通过它实现网上电视直播，视频、音频捕捉等等功能。有兴趣的话可以研究一下。