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