using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Security;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace Container.Common
{
    class VlcPlayer
    {
        private IntPtr libvlc_instance_;
        private IntPtr libvlc_media_player_;

        private double duration_;
        public VlcPlayer(string pluginPath, bool isTransform)
        {
            /*
             *   --avcodec-hurry-up, --no-avcodec-hurry-up 
                                 紧急 (默认启用)
          解码器在时间不充足的情况下可能部分解码器或跳过帧。在 CPU 不是很强大时这非常有用，但是可能会破坏图像。 (默认启用)
             * --sout-avcodec-rc-buffer-size=<整数 [-2147483648 .. 2147483647]> 
                                 速率控制缓存大小
          速率控制缓存大小 (以千字节为单位)。一个较大的缓存将会有较佳的帧率控制，但是可能会导致流的延迟。
             * --avcodec-fast, --no-avcodec-fast 
                                 允许非正常速度优化 (默认关闭)
          允许不符合标准的速度优化。更快但可能会出错。 (默认关闭)
      --avcodec-skiploopfilter={0 (无), 1 (非参考), 2 (双向), 3 (非关键), 4 (全部)} 
                                 用于 H.264 解码的跳过循环滤镜
          跳过循环滤镜 (又作去块) 通常对图像质量会造成不良的效果。但是它能为高分辨率的流提供一个很大的提速。
             * --avcodec-codec=<字串>       编解码器名称
          libavcodec 内部编解码器名称
      --avcodec-hw=<字串>          硬件解码
          这将允许硬件解码（当硬件解码可用时）。
             * --drop-late-frames, --no-drop-late-frames 
                                 丢弃延迟的帧 (默认启用)
          这将丢弃延迟的帧 (在它们实际应该显示的时间后到达视频输出)。 (默认启用)
      --skip-frames, --no-skip-frames 
                                 跳帧 (默认启用)
          在 MPEG2 串流上启用帧丢弃。帧丢弃在您的计算机性能不够强大时发生 (默认启用)
             */
            string plugin_arg = "--plugin-path=" + pluginPath;
            string[] arguments = { plugin_arg, "--network-caching=<300", ":sout=#transcode{vcodec=h264,acodec=mpga,ab=128,channels=2,samplerate=44100" };
            //string[] arguments = { plugin_arg, "--network-caching=<300", ":sout=#transcode{vcodec=h264,acodec=mpga,ab=128,channels=2,samplerate=44100" };
            string[] argumentTransform = { "-I", "dummy", "--ignore-config", "--video-title", plugin_arg, "--avcodec-skiploopfilter=4", "--avcodec-fast", "--network-caching<=1800", "pe=270", ":sout=#transcode{vcodec=h264,acodec=mpga,ab=128,channels=2,samplerate=44100" };
            //sring[] arguments = { "-I", "--avcodec-hw=any", plugin_arg,"--avcodec-codec=q//", "--avcodec-skiploopfilter=4", "--avcodec-fast", "--network-caching=<1800" };

            //if (isTransform)
            //    libvlc_instance_ = LibVlcAPI.libvlc_new(argumentTransform);
            //else
            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_);
            }
        }

        public void PlayStream(string url)
        {
            IntPtr libvlc_media = LibVlcAPI.libvlc_media_new_location(libvlc_instance_, url);
            if (libvlc_media != IntPtr.Zero)
            {
                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_);

                LibVlcAPI.libvlc_media_parse(libvlc_media);

                Thread.Sleep(300);

                duration_ = LibVlcAPI.libvlc_media_get_duration(libvlc_media) / 1000.0;
            }
        }

        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_location(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.Cdecl, ExactSpelling = true)]
        [SuppressUnmanagedCodeSecurity]
        private static extern IntPtr libvlc_new(int argc, IntPtr argv);

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

        [DllImport("libvlc", 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.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.Cdecl, ExactSpelling = true)]
        [SuppressUnmanagedCodeSecurity]
        private static extern IntPtr libvlc_media_new_path(IntPtr libvlc_instance, IntPtr path);

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

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

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

        [DllImport("libvlc", 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.Cdecl, ExactSpelling = true)]
        [SuppressUnmanagedCodeSecurity]
        public static extern void libvlc_media_parse(IntPtr libvlc_media);

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

        [DllImport("libvlc", 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.Cdecl, ExactSpelling = true)]
        [SuppressUnmanagedCodeSecurity]
        public static extern int libvlc_audio_get_volume(IntPtr libvlc_media_player);

        [DllImport("libvlc", 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.Cdecl, ExactSpelling = true)]
        [SuppressUnmanagedCodeSecurity]
        public static extern void libvlc_set_fullscreen(IntPtr libvlc_media_player, int isFullScreen);
    }
}