c# 播放器支持所有格式

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2024-07-23 16:16:46 219人阅读

原文:c# 播放器支持所有格式

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直接上代码

internal static class LibVlcAPI
{
internal struct PointerToArrayOfPointerHelper
{
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 1000)]
public IntPtr[] pointers;
}

public static IntPtr libvlc_new(string[] arguments)
{
PointerToArrayOfPointerHelper argv = new PointerToArrayOfPointerHelper();
argv.pointers = new IntPtr[1000];

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);
}
}
}
//从路径构建一个视频文件
public static IntPtr libvlc_media_new_path(IntPtr libvlc_instance, string path)
{
IntPtr pMrl = IntPtr.Zero;

{
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);
}

}
//从网络位置构建一个视频文件
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

// 创建一个libvlc实例，它是引用计数的
[DllImport("libvlc", CallingConvention = CallingConvention.StdCall, 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)]
[SuppressUnmanagedCodeSecurity]
public static extern void libvlc_release(IntPtr libvlc_instance);

[DllImport("libvlc", CallingConvention = CallingConvention.StdCall, 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)]
[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)]
[SuppressUnmanagedCodeSecurity]
private static extern IntPtr libvlc_media_new_path(IntPtr libvlc_instance, IntPtr path);

[DllImport("libvlc", CallingConvention = CallingConvention.StdCall, 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)]
[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)]
[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)]
[SuppressUnmanagedCodeSecurity]
public static extern void libvlc_media_player_set_hwnd(IntPtr libvlc_mediaplayer, Int32 drawable);

[DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
public static extern void libvlc_media_player_play(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)]
[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)]
[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)]
[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)]
[SuppressUnmanagedCodeSecurity]
public static extern void libvlc_media_player_set_time(IntPtr libvlc_mediaplayer, Int64 time);

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

[DllImport("libvlc", CallingConvention = CallingConvention.StdCall, 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)]
[SuppressUnmanagedCodeSecurity]
public static extern void libvlc_set_fullscreen(IntPtr libvlc_media_player, int isFullScreen);

//设置播放速度
[DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
[SuppressUnmanagedCodeSecurity]
public static extern int libvlc_media_player_set_rate(IntPtr libvlc_media, float rate);
}

这个是将libvlc里面的api导入到c#开发环境中

class VlcPlayer
{
//播放视频文件实例
private IntPtr libvlc_instance_;
//播放实例
private IntPtr libvlc_media_player_;
//视频时长
private double duration_;

public VlcPlayer(string pluginPath)
{
string plugin_arg = "--plugin-path=" + pluginPath;
string[] arguments = { "0", "dummy", "--ignore-config", "--no-video-title", plugin_arg };
//播放视频文件实例
libvlc_instance_ = LibVlcAPI.libvlc_new(arguments);
//播放实例
libvlc_media_player_ = LibVlcAPI.libvlc_media_player_new(libvlc_instance_);
}

//接受窗口句炳
public void SetRenderWindow(int wndHandle)
{
if (libvlc_instance_ != IntPtr.Zero && wndHandle != 0)
{
LibVlcAPI.libvlc_media_player_set_hwnd(libvlc_media_player_, wndHandle);
}
}

//播放器控制视频的播放
public void PlayFile(string filePath)
{
IntPtr libvlc_media = LibVlcAPI.libvlc_media_new_location(libvlc_instance_, filePath);
if (libvlc_media != IntPtr.Zero)
{
LibVlcAPI.libvlc_media_parse(libvlc_media);
//返回视频的时长

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_);
}
}
//播放器控制视频文件的解析
public void Pause()
{
if (libvlc_media_player_ != IntPtr.Zero)
{
LibVlcAPI.libvlc_media_player_pause(libvlc_media_player_);
}
}
//播放器控制视频文件的停止
public void Stop()
{
if (libvlc_media_player_ != IntPtr.Zero)
{
LibVlcAPI.libvlc_media_player_stop(libvlc_media_player_);
}
}

//播放器得到当前的播放时间
public double GetPlayTime()
{
return LibVlcAPI.libvlc_media_player_get_time(libvlc_media_player_) / 1000.0;
}

//播放器设置当前的播放时间
public void SetPlayTime(double seekTime)
{
LibVlcAPI.libvlc_media_player_set_time(libvlc_media_player_, (Int64)(seekTime * 1000));
}

//播放器得到当前播放声音大小
public int GetVolume()
{
return LibVlcAPI.libvlc_audio_get_volume(libvlc_media_player_);
}

//播放器设置当前的播放声音
public void SetVolume(int volume)
{
LibVlcAPI.libvlc_audio_set_volume(libvlc_media_player_, volume);
}
//设置全屏
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();
}

public int SetRate(float rate){
return LibVlcAPI.libvlc_media_player_set_rate(libvlc_media_player_,rate);

}
}

这个是调用下面导入的函数重新封装

下面我讲解一个方法的调用过程其他的可以到代码中学习