c#万能视频播放器

我不是女神ヾ 2022-08-26 00:43 166阅读 0赞

# http://www.cnblogs.com/haibindev/archive/2011/12/21/2296173.html    #

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**:)**

![2011122118183736.jpg][]

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

![复制代码][copycode.gif]

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 
    80         // 获取和设置音量
    81         [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
    82         [SuppressUnmanagedCodeSecurity]
    83         public static extern int libvlc_audio_get_volume(IntPtr libvlc_media_player);
    84 
    85         [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
    86         [SuppressUnmanagedCodeSecurity]
    87         public static extern void libvlc_audio_set_volume(IntPtr libvlc_media_player, int volume);
    88 
    89         // 设置全屏
    90         [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
    91         [SuppressUnmanagedCodeSecurity]
    92         public static extern void libvlc_set_fullscreen(IntPtr libvlc_media_player, int isFullScreen);

![复制代码][copycode.gif]

要使用libvlc api进行播放，首先需要创建一个libvlc的实例，就是lbvlc\_instance，之后所有的操作都是基于这个实例来完成。

每一个播放窗口，对应一个libvlc\_media\_player，而每一个媒体文件，就是一个libvlc\_media。所以，调用的步骤就是：

1.  1.  **创建libvlc\_instance**
    2.  **创建libvlc\_media\_player**
    3.  **开始播放时，创建libvlc\_media，通知libvlc\_media\_player要播放的媒体文件，之后就可以释放libvlc\_media了**
    4.  **操作libvlc\_media\_player，实现播放、暂停等功能**

下面对这些操作进行封装，以供上层使用。

![复制代码][copycode.gif]

1     class VlcPlayer
     2     {
     3         private IntPtr libvlc_instance_;
     4         private IntPtr libvlc_media_player_;
     5 
     6         private double duration_;
     7 
     8         public VlcPlayer(string pluginPath)
     9         {
    10             string plugin_arg = "--plugin-path=" + pluginPath;
    11             string[] arguments = { "-I", "dummy", "--ignore-config", "--no-video-title", plugin_arg };
    12             libvlc_instance_ = LibVlcAPI.libvlc_new(arguments);
    13 
    14             libvlc_media_player_ = LibVlcAPI.libvlc_media_player_new(libvlc_instance_);
    15         }
    16 
    17         public void SetRenderWindow(int wndHandle)
    18         {
    19             if (libvlc_instance_ != IntPtr.Zero && wndHandle != 0)
    20             {
    21                 LibVlcAPI.libvlc_media_player_set_hwnd(libvlc_media_player_, wndHandle);
    22             }
    23         }
    24 
    25         public void PlayFile(string filePath)
    26         {
    27             IntPtr libvlc_media = LibVlcAPI.libvlc_media_new_path(libvlc_instance_, filePath);
    28             if (libvlc_media != IntPtr.Zero)
    29             {
    30                 LibVlcAPI.libvlc_media_parse(libvlc_media);
    31                 duration_ = LibVlcAPI.libvlc_media_get_duration(libvlc_media) / 1000.0;
    32 
    33                 LibVlcAPI.libvlc_media_player_set_media(libvlc_media_player_, libvlc_media);
    34                 LibVlcAPI.libvlc_media_release(libvlc_media);
    35 
    36                 LibVlcAPI.libvlc_media_player_play(libvlc_media_player_);
    37             }
    38         }
    39 
    40         public void Pause()
    41         {
    42             if (libvlc_media_player_ != IntPtr.Zero)
    43             {
    44                 LibVlcAPI.libvlc_media_player_pause(libvlc_media_player_);
    45             }
    46         }
    47 
    48         public void Stop()
    49         {
    50             if (libvlc_media_player_ != IntPtr.Zero)
    51             {
    52                 LibVlcAPI.libvlc_media_player_stop(libvlc_media_player_);
    53             }
    54         }
    55 
    56         public double GetPlayTime()
    57         {
    58             return LibVlcAPI.libvlc_media_player_get_time(libvlc_media_player_) / 1000.0;
    59         }
    60 
    61         public void SetPlayTime(double seekTime)
    62         {
    63             LibVlcAPI.libvlc_media_player_set_time(libvlc_media_player_, (Int64)(seekTime * 1000));
    64         }
    65 
    66         public int GetVolume()
    67         {
    68             return LibVlcAPI.libvlc_audio_get_volume(libvlc_media_player_);
    69         }
    70 
    71         public void SetVolume(int volume)
    72         {
    73             LibVlcAPI.libvlc_audio_set_volume(libvlc_media_player_, volume);
    74         }
    75 
    76         public void SetFullScreen(bool istrue)
    77         {
    78             LibVlcAPI.libvlc_set_fullscreen(libvlc_media_player_, istrue ? 1 : 0);
    79         }
    80 
    81         public double Duration()
    82         {
    83             return duration_;
    84         }
    85 
    86         public string Version()
    87         {
    88             return LibVlcAPI.libvlc_get_version();
    89         }
    90     }

![复制代码][copycode.gif]

封装为VlcPlayer之后，调用就会变得非常简单。

*  **首先确定好vlc的插件目录**
 *  **在你的代码里创建VlcPlayer对象**
 *  **调用SetRenderWindow，以设置视频显示的窗口，否则会变成一个独立的播放窗口**
 *  **调用PlayFile，即可开始播放**

![2011122118381447.jpg][]

程序做好之后，需要带上**libvlc.dll**和**libvlccore.dll**，这两个是vlc的播放内核，因为vlc把编解码和格式解析的支持设计成了插件的形式，所以还必须要带上vlc的**plugins**目录里的插件。

我把整个工程打包（包括**libvlc.dll**和**libvlccore.dll）**上传到了博客上，[点击这里][Link 1]，就可以下载。

**　　plugins**目录文件有点大（因为libvlc支持的格式和功能非常多，如果你不需要，删掉对应插件即可），我放到了115网盘，下载地址是[http://115.com/file/dnre4jg7\#plugins.7z][http_115.com_file_dnre4jg7_plugins.7z]。下载后放到“**bin/Debug”**目录即可调试运行。

[2011122118183736.jpg]: /images/20220824/6e2629b9503342658d03f8e25adb61eb.png
[copycode.gif]: /images/20220824/060d34359bbb4b6baf21770ac2cfd9e7.png
[2011122118381447.jpg]: /images/20220824/4bbbf5c0dbf7441a94a674553244a95c.png
[Link 1]: http://files.cnblogs.com/haibindev/vlc.net.7z
[http_115.com_file_dnre4jg7_plugins.7z]: http://115.com/file/dnre4jg7#plugins.7z