vlc的应用之三：动态调用vlc-0.9.4的libvlc.dll【转】

 vlc的应用之三：动态调用vlc-0.9.4的libvlc.dll

2008-12-03 17:38:46

标签：WinForm C# libvlc.dll 休闲 vlc

原创作品，允许转载，转载时请务必以超链接形式标明文章 原始出处 、作者信息和本声明。否则将追究法律责任。http://jeremiah.blog.51cto.com/539865/116981

    vlc-0.9.4提供的libvlc.dll是可以动态调用的，Jeremiah这一篇博客就介绍下如何用C#和WinForm框架调用libvlc.dll作个简易播放器。

 

    1. vs2005新建工程，将vlc-0.9.4的libvlc.dll，libvlccore.dll，plugins目录全部拷贝到工程目录下面\bin\Debug中。

 

    2. 创建异常结构体

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace MyOwnPlayer 
{ 
        //异常结构体 
        public struct ExceptionStruct 
        { 
                private int raised; 
                private int code; 
                private string message; 
        } 
 
        class MediaException 
        { 
        } 
}

 

    3. CoreHandle和Core类

using System; 
using System.Runtime.InteropServices; 
 
namespace MyOwnPlayer 
{ 
        class CoreHandle : SafeHandle 
        { 
                //构造方法 
                public CoreHandle() 
                        : base(IntPtr.Zero, true) 
                { 
                } 
 
                //重写的方法 
                public override bool IsInvalid 
                { 
                        get { return handle == IntPtr.Zero; } 
                } 
 
                protected override bool ReleaseHandle() 
                { 
                        if (!IsInvalid) 
                        { 
                                libvlc_release(this); 
                                handle = IntPtr.Zero; 
                        } 
                        return true; 
                } 
 
                protected override void Dispose(bool disposing) 
                { 
                        ReleaseHandle(); 
                        base.Dispose(disposing); 
                } 
 
                //Dll动态导入 
                [DllImport("libvlc")] 
                private static extern void libvlc_release(CoreHandle coreHandle); 
        } 
} 

 

using System; 
using System.Runtime.InteropServices; 
 
namespace MyOwnPlayer 
{ 
        class Core 
        { 
                //coreHandle字段和属性 
                private CoreHandle coreHandle; 
                public CoreHandle CoreHandle 
                { 
                        get { return coreHandle; } 
                } 
                 
                //构造方法 
                public Core(string[] argv, ref ExceptionStruct ex) 
                { 
                        coreHandle = libvlc_new(argv.Length, argv, ref ex); 
                } 
 
                //Dll动态导入 
                [DllImport("libvlc")] 
                private static extern CoreHandle libvlc_new(int argc, string[] args, ref ExceptionStruct ex); 
        } 
} 

 

    3. MediaHandle和Media类，注意里面的非英文路径处理方法。

using System; 
using System.Runtime.InteropServices; 
 
namespace MyOwnPlayer 
{ 
        class MediaHandle : SafeHandle 
        { 
                //构造方法 
                public MediaHandle() 
                        : base(IntPtr.Zero, true) 
                { 
                } 
 
                //重写的方法 
                public override bool IsInvalid 
                { 
                        get { return handle == IntPtr.Zero; } 
                } 
 
                protected override bool ReleaseHandle() 
                { 
                        if (!IsInvalid) 
                        { 
                                libvlc_media_release(this); 
                                handle = IntPtr.Zero; 
                        } 
                        return true; 
                } 
 
                protected override void Dispose(bool disposing) 
                { 
                        ReleaseHandle(); 
                        base.Dispose(disposing); 
                } 
 
                //Dll动态导入 
                [DllImport("libvlc")] 
                private static extern void libvlc_media_release(MediaHandle mediaHandle);                 
        } 
} 

 

using System; 
using System.Text; 
using System.Runtime.InteropServices; 
 
namespace MyOwnPlayer 
{ 
        class Media 
        { 
                //mediaHandle字段和属性 
                private MediaHandle mediaHandle; 
                public MediaHandle MediaHandle 
                { 
                        get { return mediaHandle; } 
                } 
 
                //构造方法                
                public Media(CoreHandle coreHandle, String filename, ref ExceptionStruct ex) 
                { 
                        //c#为UTF-16编码, libvlc.dll为UTF-8编码, 需要转换. 
                        UTF8Encoding utf8 = new UTF8Encoding(); 
                        mediaHandle = libvlc_media_new(coreHandle, utf8.GetBytes(filename), ref ex); 
                } 
                 
                //Dll动态导入 
                [DllImport("libvlc")] 
                private static extern MediaHandle libvlc_media_new 
                        (CoreHandle coreHandle, [MarshalAs(UnmanagedType.LPArray)] byte[] link, refExceptionStruct ex); 
                } 
} 

 

    5. MediaPlayerHandle和MediaPlayer类

using System; 
using System.Runtime.InteropServices; 
 
namespace MyOwnPlayer 
{ 
        class MediaPlayerHandle : SafeHandle 
        { 
                //构造方法 
                public MediaPlayerHandle() 
                        : base(IntPtr.Zero, true) 
                { 
                } 
 
                //重写的方法 
                public override bool IsInvalid 
                { 
                        get { return handle == IntPtr.Zero; } 
                } 
 
                protected override bool ReleaseHandle() 
                { 
                        if (!IsInvalid) 
                        { 
                                libvlc_media_player_release(this);                                handle = IntPtr.Zero; 
                        } 
                        return true; 
                } 
 
                protected override void Dispose(bool disposing) 
                { 
                        ReleaseHandle(); 
                        base.Dispose(disposing); 
                } 
 
                //Dll动态导入 
                [DllImport("libvlc")] 
                private static extern void libvlc_media_player_release(MediaPlayerHandle mediaPlayerHandle); 
        } 
} 

 

using System; 
using System.Runtime.InteropServices; 
 
namespace MyOwnPlayer 
{ 
        class MediaPlayer 
        { 
                //mediaPlayerHandle字段和属性 
                private MediaPlayerHandle mediaPlayerHandle; 
                public MediaPlayerHandle MediaPlayerHandle 
                { 
                        get { return mediaPlayerHandle; } 
                } 
 
                //构造方法 
                public MediaPlayer(MediaHandle mediaHandle, ref ExceptionStruct ex) 
                { 
                        mediaPlayerHandle = libvlc_media_player_new_from_media(mediaHandle, ref ex); 
                } 
 
                //设置父窗口 
                public void VedioSetParent(CoreHandle coreHandle, IntPtr hDT, ref ExceptionStruct ex) 
                { 
                        libvlc_video_set_parent(coreHandle, hDT, ref ex); 
                } 
 
                //播放 
                public void Play(ref ExceptionStruct ex) 
                { 
                        libvlc_media_player_play(mediaPlayerHandle, ref ex); 
                } 
 
                //停止 
                public void Stop(ref ExceptionStruct ex) 
                { 
                        libvlc_media_player_stop(mediaPlayerHandle, ref ex); 
                } 
 
                //Dll动态导入 
                [DllImport("libvlc")] 
                private static extern MediaPlayerHandle libvlc_media_player_new_from_media(MediaHandle libvlc_media_handle, ref ExceptionStruct ex); 
 
                [DllImport("libvlc")] 
                private static extern void libvlc_video_set_parent(CoreHandle coreHandle, IntPtr hDT, refExceptionStruct ex); 
 
                [DllImport("libvlc")] 
                private static extern void libvlc_media_player_play(MediaPlayerHandle mediaPlayerHandle, ref ExceptionStruct ex); 
 
                [DllImport("libvlc")] 
                private static extern void libvlc_media_player_stop(MediaPlayerHandle mediaPlayerHandle, ref ExceptionStruct ex); 
        } 
} 

 

    6. 基本工作做好了。下一步建立一个Form，里面画一个Panel(播放容器)，画一个Textbox(播放地址)，画一个Button(播放按钮)，Button的点击事件为：

private void button1_Click(object sender, EventArgs e) 
{ 
        //要播放的文件的uri 
        string uri = this.textBox1.Text; 

         //进行播放的控件的句柄 
        IntPtr hdl = this.panel1.Handle; 

         //播放参数 
        string[] argv = new string[] { "-I", "--ignore-config" }; 

         //vlc对象的创建 
        ExceptionStruct ex = new ExceptionStruct(); 
        Core core = new Core(argv, ref ex); 
        Media media = new Media(core.CoreHandle, uri, ref ex); 
        MediaPlayer player = new MediaPlayer(media.MediaHandle, ref ex); 

         //垃圾回收 
        GC.Collect(); 

         //播放 
        player.VedioSetParent(core.CoreHandle, hdl, ref ex); 
        player.Play(ref ex); 

         //继续回收垃圾等相关操作 
        GC.Collect(); 
        GC.WaitForPendingFinalizers(); 
}

 

    7. 基本的播放功能就是这样实现的。其他接口请参考源码下面的\include\vlc\libvlc.h文件，里面有比较详细的对外接口的说明。

 

    8. 以上代码已经发送到附件中(MyOwnPlayer.rar)，参考网址的楼主写的代码也在附件中(Marx_libvlc_wrapper(2).zip)。调试附件请注意第1步。

   

参考网址：

1. [url]http://forum.videolan.org/viewtopic.php?f=14&t=47385&st=0&sk=t&sd=a&hilit=C%23+wrapper[/url]

本文出自 “海狗哥的流媒体空间” 博客，请务必保留此出处http://jeremiah.blog.51cto.com/539865/116981

lbp0200、xc_shen、jiang421122

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附件下载：
　　Marx_libvlc_wrapper(2).zip
　　MyOwnPlayer.rar

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