http://blog.csdn.net/yanzhibo/article/details/8972822
本人之前很多的文章中均提到了使用libvlc为播放器内核制作的播放器，也许有些朋友对此感兴趣，于是我用c#写了一个调用libvlc api实现的万能视频播放器，与大家分享一下。说它“万能”，当然是因为我们站在了vlc的肩膀上。
vlc是一个强大而且开源的多媒体播放器，也可以说是一个多媒体平台。它支持非常广泛的媒体格式的本地播放，完全可以媲美mplayer，其对视频网络流的处理能力更是非常强悍。libvlc就是指的vlc的核心，它向外提供了一系列的接口，通过接口，来实现视频播放等复杂的功能。libvlc对外提供了c语言的接口，也有其他语言，包括.net的绑定，在其官网上就有，不过已经“年久失修”。我之前用Qt, MFC实现过基于libvlc的播放器，不过鉴于园子里c#开发人员较多，遂用c#封装了一下libvlc的API接口，并实现了一个视频播放器。
先上鉴赏图，外表很简单，不过，外表不是重点:)
首先是libvlc的一些导出函数，我在注释里对它们的功能都有说明
1 // 创建一个libvlc实例，它是引用计数的
2 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
3 [SuppressUnmanagedCodeSecurity]
4 private static extern IntPtr libvlc_new(int argc, IntPtr argv);
5
6 // 释放libvlc实例
7 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
8 [SuppressUnmanagedCodeSecurity]
9 public static extern void libvlc_release(IntPtr libvlc_instance);
10
11 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
12 [SuppressUnmanagedCodeSecurity]
13 public static extern String libvlc_get_version();
14
15 // 从视频来源(例如Url)构建一个libvlc_meida
16 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
17 [SuppressUnmanagedCodeSecurity]
18 private static extern IntPtr libvlc_media_new_location(IntPtr libvlc_instance, IntPtr path);
19
20 // 从本地文件路径构建一个libvlc_media
21 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
22 [SuppressUnmanagedCodeSecurity]
23 private static extern IntPtr libvlc_media_new_path(IntPtr libvlc_instance, IntPtr path);
24
25 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
26 [SuppressUnmanagedCodeSecurity]
27 public static extern void libvlc_media_release(IntPtr libvlc_media_inst);
28
29 // 创建libvlc_media_player(播放核心)
30 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
31 [SuppressUnmanagedCodeSecurity]
32 public static extern IntPtr libvlc_media_player_new(IntPtr libvlc_instance);
33
34 // 将视频(libvlc_media)绑定到播放器上
35 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
36 [SuppressUnmanagedCodeSecurity]
37 public static extern void libvlc_media_player_set_media(IntPtr libvlc_media_player, IntPtr libvlc_media);
38
39 // 设置图像输出的窗口
40 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
41 [SuppressUnmanagedCodeSecurity]
42 public static extern void libvlc_media_player_set_hwnd(IntPtr libvlc_mediaplayer, Int32 drawable);
43
44 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
45 [SuppressUnmanagedCodeSecurity]
46 public static extern void libvlc_media_player_play(IntPtr libvlc_mediaplayer);
47
48 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
49 [SuppressUnmanagedCodeSecurity]
50 public static extern void libvlc_media_player_pause(IntPtr libvlc_mediaplayer);
51
52 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
53 [SuppressUnmanagedCodeSecurity]
54 public static extern void libvlc_media_player_stop(IntPtr libvlc_mediaplayer);
55
56 // 解析视频资源的媒体信息(如时长等)
57 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
58 [SuppressUnmanagedCodeSecurity]
59 public static extern void libvlc_media_parse(IntPtr libvlc_media);
60
61 // 返回视频的时长(必须先调用libvlc_media_parse之后，该函数才会生效)
62 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
63 [SuppressUnmanagedCodeSecurity]
64 public static extern Int64 libvlc_media_get_duration(IntPtr libvlc_media);
65
66 // 当前播放的时间
67 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
68 [SuppressUnmanagedCodeSecurity]
69 public static extern Int64 libvlc_media_player_get_time(IntPtr libvlc_mediaplayer);
70
71 // 设置播放位置(拖动)
72 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
73 [SuppressUnmanagedCodeSecurity]
74 public static extern void libvlc_media_player_set_time(IntPtr libvlc_mediaplayer, Int64 time);
75
76 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
77 [SuppressUnmanagedCodeSecurity]
78 public static extern void libvlc_media_player_release(IntPtr libvlc_mediaplayer);
79