C#下基于vlc的视频播放功能开发

由于项目需要，要回放一些视频资料，经过多方调研，最后决定使用vlc方案。好处优点请大家自行百度谷歌，这里就不废话了。

开发环境：

工具： VS2010 .net4.0

程序类型：WindowsForm

语言：C#

实现功能：读取视频文件、为后续开发做铺垫。

vlc网上资料很多，但能用过编译的少之又少，经过一天的尝试终于整理成可以运行的vlcSDK。先上图，有图有真相。

.如上图，右侧两图为使用vlc开发的视频播放效果。由于该项目不变透露过多信息。所以针对vlc特意编写一个播放器软件供大家学习研讨，也是通过研究后才正式写的项目程序。稍后会把视软件上传CSDN。

视频播放软件包括工具栏和播放窗口，工具栏包括按钮和表示视频播放时间的进度条。播放器如下图所示：

主要做如下介绍：

CLV2.2 SDK
包括内容：
1、libvlc.dll
2、libvlc.dll
3、plugins文件夹
4、VlcPlayer.cs

前三个为clvSDK文件，VlcPlayer.cs为C#编写的调用SDK的类和函数

using System;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Security;
using System.Collections.Generic;
using System.Text;

namespace vlc.net
{
class VlcPlayer
{
private IntPtr libvlc_instance_;
private IntPtr libvlc_media_player_;

private double duration_;

public VlcPlayer(string pluginPath)
{
string plugin_arg = "--plugin-path=" + pluginPath;
string[] arguments = { "-I", "dummy", "--ignore-config", "--no-video-title", plugin_arg };
libvlc_instance_ = LibVlcAPI.libvlc_new(arguments);

libvlc_media_player_ = LibVlcAPI.libvlc_media_player_new(libvlc_instance_);
}

public void SetRenderWindow(int wndHandle)
{
if (libvlc_instance_ != IntPtr.Zero && wndHandle != 0)
{
LibVlcAPI.libvlc_media_player_set_hwnd(libvlc_media_player_, wndHandle);
}
}

public void PlayFile(string filePath)
{
IntPtr libvlc_media = LibVlcAPI.libvlc_media_new_path(libvlc_instance_, filePath);
if (libvlc_media != IntPtr.Zero)
{
LibVlcAPI.libvlc_media_parse(libvlc_media);
// duration_ = LibVlcAPI.libvlc_media_get_duration(libvlc_media) / 1000.0;
LibVlcAPI.libvlc_media_player_set_media(libvlc_media_player_, libvlc_media);
LibVlcAPI.libvlc_media_release(libvlc_media);
LibVlcAPI.libvlc_media_player_play(libvlc_media_player_);

duration_ = LibVlcAPI.libvlc_media_get_duration(libvlc_media) / 1000.0;

if (duration_ == 0)
{
duration_ = 597;
}

}
}
public void Play()
{
LibVlcAPI.libvlc_media_player_play(libvlc_media_player_);
}

public void Pause()
{
if (libvlc_media_player_ != IntPtr.Zero)
{
LibVlcAPI.libvlc_media_player_pause(libvlc_media_player_);
}
}

public void Stop()
{
if (libvlc_media_player_ != IntPtr.Zero)
{
LibVlcAPI.libvlc_media_player_stop(libvlc_media_player_);
}
}

public double GetPlayTime()
{
return LibVlcAPI.libvlc_media_player_get_time(libvlc_media_player_) / 1000.0;
}

public void SetPlayTime(double seekTime)
{
LibVlcAPI.libvlc_media_player_set_time(libvlc_media_player_, (Int64)(seekTime * 1000));
}

public int GetVolume()
{
return LibVlcAPI.libvlc_audio_get_volume(libvlc_media_player_);
}

public void SetVolume(int volume)
{
LibVlcAPI.libvlc_audio_set_volume(libvlc_media_player_, volume);
}

public void SetFullScreen(bool istrue)
{
LibVlcAPI.libvlc_set_fullscreen(libvlc_media_player_, istrue ? 1 : 0);
}

public double Duration()
{
return duration_;
}

public string Version()
{
return LibVlcAPI.libvlc_get_version();
}
}

internal static class LibVlcAPI
{
internal struct PointerToArrayOfPointerHelper
{
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 11)]
public IntPtr[] pointers;
}

public static IntPtr libvlc_new(string[] arguments)
{
PointerToArrayOfPointerHelper argv = new PointerToArrayOfPointerHelper();
argv.pointers = new IntPtr[11];

for (int i = 0; i < arguments.Length; i++)
{
argv.pointers[i] = Marshal.StringToHGlobalAnsi(arguments[i]);
}

IntPtr argvPtr = IntPtr.Zero;
try
{
int size = Marshal.SizeOf(typeof(PointerToArrayOfPointerHelper));
argvPtr = Marshal.AllocHGlobal(size);
Marshal.StructureToPtr(argv, argvPtr, false);

return libvlc_new(arguments.Length, argvPtr);
}
finally
{
for (int i = 0; i < arguments.Length + 1; i++)
{
if (argv.pointers[i] != IntPtr.Zero)
{
Marshal.FreeHGlobal(argv.pointers[i]);
}
}
if (argvPtr != IntPtr.Zero)
{
Marshal.FreeHGlobal(argvPtr);
}
}
}

public static IntPtr libvlc_media_new_path(IntPtr libvlc_instance, string path)
{
IntPtr pMrl = IntPtr.Zero;
try
{
byte[] bytes = Encoding.UTF8.GetBytes(path);
pMrl = Marshal.AllocHGlobal(bytes.Length + 1);
Marshal.Copy(bytes, 0, pMrl, bytes.Length);
Marshal.WriteByte(pMrl, bytes.Length, 0);
return libvlc_media_new_path(libvlc_instance, pMrl);
}
finally
{
if (pMrl != IntPtr.Zero)
{
Marshal.FreeHGlobal(pMrl);
}
}
}

public static IntPtr libvlc_media_new_location(IntPtr libvlc_instance, string path)
{
IntPtr pMrl = IntPtr.Zero;
try
{
byte[] bytes = Encoding.UTF8.GetBytes(path);
pMrl = Marshal.AllocHGlobal(bytes.Length + 1);
Marshal.Copy(bytes, 0, pMrl, bytes.Length);
Marshal.WriteByte(pMrl, bytes.Length, 0);
return libvlc_media_new_path(libvlc_instance, pMrl);
}
finally
{
if (pMrl != IntPtr.Zero)
{
Marshal.FreeHGlobal(pMrl);
}
}
}

// ----------------------------------------------------------------------------------------
// 以下是libvlc.dll导出函数
// [DllImport("xx.dll", EntryPoint=“xxFunction”, CallingConvention = CallingConvention.Cdecl)]
// 创建一个libvlc实例，它是引用计数的
// [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[DllImport("libvlc.dll", EntryPoint = "libvlc_new", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
private static extern IntPtr libvlc_new(int argc, IntPtr argv);

// 释放libvlc实例
// [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[DllImport("libvlc.dll", EntryPoint = "libvlc_release", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
public static extern void libvlc_release(IntPtr libvlc_instance);

// [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[DllImport("libvlc.dll", EntryPoint = "libvlc_get_version", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
public static extern String libvlc_get_version();

// 从视频来源(例如Url)构建一个libvlc_meida
// [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[DllImport("libvlc.dll", EntryPoint = "libvlc_media_new_location", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
private static extern IntPtr libvlc_media_new_location(IntPtr libvlc_instance, IntPtr path);

// 从本地文件路径构建一个libvlc_media
// [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[DllImport("libvlc.dll", EntryPoint = "libvlc_media_new_path", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
private static extern IntPtr libvlc_media_new_path(IntPtr libvlc_instance, IntPtr path);

// [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[DllImport("libvlc.dll", EntryPoint = "libvlc_media_release", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
public static extern void libvlc_media_release(IntPtr libvlc_media_inst);

// 创建libvlc_media_player(播放核心)
// [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[DllImport("libvlc.dll", EntryPoint = "libvlc_media_player_new", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
public static extern IntPtr libvlc_media_player_new(IntPtr libvlc_instance);

// 将视频(libvlc_media)绑定到播放器上
// [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[DllImport("libvlc.dll", EntryPoint = "libvlc_media_player_set_media", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
public static extern void libvlc_media_player_set_media(IntPtr libvlc_media_player, IntPtr libvlc_media);

// 设置图像输出的窗口
// [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[DllImport("libvlc.dll", EntryPoint = "libvlc_media_player_set_hwnd", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
public static extern void libvlc_media_player_set_hwnd(IntPtr libvlc_mediaplayer, Int64 drawable);

// [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[DllImport("libvlc.dll", EntryPoint = "libvlc_media_player_play", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
public static extern void libvlc_media_player_play(IntPtr libvlc_mediaplayer);

// [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[DllImport("libvlc.dll", EntryPoint = "libvlc_media_player_pause", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
public static extern void libvlc_media_player_pause(IntPtr libvlc_mediaplayer);

// [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[DllImport("libvlc.dll", EntryPoint = "libvlc_media_player_stop", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
public static extern void libvlc_media_player_stop(IntPtr libvlc_mediaplayer);

// 解析视频资源的媒体信息(如时长等)
// [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[DllImport("libvlc.dll", EntryPoint = "libvlc_media_parse", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
public static extern void libvlc_media_parse(IntPtr libvlc_media);

// 返回视频的时长(必须先调用libvlc_media_parse之后，该函数才会生效)
// [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[DllImport("libvlc.dll", EntryPoint = "libvlc_media_get_duration", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
public static extern Int64 libvlc_media_get_duration(IntPtr libvlc_media);

// 当前播放的时间
// [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[DllImport("libvlc.dll", EntryPoint = "libvlc_media_player_get_time", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
public static extern Int64 libvlc_media_player_get_time(IntPtr libvlc_mediaplayer);

// 设置播放位置(拖动)
// [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[DllImport("libvlc.dll", EntryPoint = "libvlc_media_player_set_time", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
public static extern void libvlc_media_player_set_time(IntPtr libvlc_mediaplayer, Int64 time);

// [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[DllImport("libvlc.dll", EntryPoint = "libvlc_media_player_release", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
public static extern void libvlc_media_player_release(IntPtr libvlc_mediaplayer);

// 获取和设置音量
// [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[DllImport("libvlc.dll", EntryPoint = "libvlc_audio_get_volume", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
public static extern int libvlc_audio_get_volume(IntPtr libvlc_media_player);

// [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[DllImport("libvlc.dll", EntryPoint = "libvlc_audio_set_volume", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
public static extern void libvlc_audio_set_volume(IntPtr libvlc_media_player, int volume);

// 设置全屏
// [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[DllImport("libvlc.dll", EntryPoint = "libvlc_set_fullscreen", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
public static extern void libvlc_set_fullscreen(IntPtr libvlc_media_player, int isFullScreen);
}
}

代码不做过多介绍，已经将源码上传MSDN，

链接：

播放器源码（包括SDK）：https://download.csdn.net/download/w267309080/11967649

SDK：https://download.csdn.net/download/w267309080/11967641

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