vlc的应用之三：动态调用vlc-0.9.4的libvlc.dll

请移步https://higoge.github.io/，所有下载资料在那个博客都能找到。谢谢。 -------------------------------------------------------------------- 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, ref ExceptionStruct 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, ref ExceptionStruct 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. http://forum.videolan.org/viewtopic.php?f=14&t=47385&st=0&sk=t&sd=a&hilit=C%23+wrapper
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