C#中调用libvlc实现本地、网络节目流的播放

using System;using System.Text;using System.Runtime.InteropServices;using System.Security;using System.IO;using System.Threading;namespace Net.Media{    //定义替代变量    using libvlc_media_t = System.IntPtr;    using libvlc_media_player_t = System.IntPtr;    using libvlc_instance_t = System.IntPtr;    class MediaPlayer    {        #region 全局变量        //数组转换为指针        internal struct PointerToArrayOfPointerHelper        {            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 11)]            public IntPtr[] pointers;        }        //vlc库启动参数配置        private static string pluginPath = System.Environment.CurrentDirectory + "\\plugins\\";        private static string plugin_arg = "--plugin-path=" + pluginPath;        //用于播放节目时，转录节目        //private static string program_arg = "--sout=#duplicate{dst=std{access=file,mux=ts,dst=d:/test.ts}}";        private static string[] arguments = { "-I", "dummy", "--ignore-config", "--video-title", plugin_arg};//, program_arg };        #region 结构体        public struct libvlc_media_stats_t        {            /* Input */            public int i_read_bytes;            public float f_input_bitrate;            /* Demux */            public int i_demux_read_bytes;            public float f_demux_bitrate;            public int i_demux_corrupted;            public int i_demux_discontinuity;            /* Decoders */            public int i_decoded_video;            public int i_decoded_audio;            /* Video Output */            public int i_displayed_pictures;            public int i_lost_pictures;            /* Audio output */            public int i_played_abuffers;            public int i_lost_abuffers;            /* Stream output */            public int i_sent_packets;            public int i_sent_bytes;            public float f_send_bitrate;        }        #endregion        #endregion        #region 公开函数        /// <summary>        /// 创建VLC播放资源索引        /// </summary>        /// <param name="arguments"></param>        /// <returns></returns>        public static libvlc_instance_t Create_Media_Instance()        {            libvlc_instance_t libvlc_instance = IntPtr.Zero;            IntPtr argvPtr = IntPtr.Zero;            try            {                if (arguments.Length == 0 ||                    arguments == null)                {                    return IntPtr.Zero;                }                //将string数组转换为指针                argvPtr = StrToIntPtr(arguments);                if (argvPtr == null || argvPtr == IntPtr.Zero)                {                    return IntPtr.Zero;                }                //设置启动参数                libvlc_instance = SafeNativeMethods.libvlc_new(arguments.Length, argvPtr);                if (libvlc_instance == null || libvlc_instance == IntPtr.Zero)                {                    return IntPtr.Zero;                }                return libvlc_instance;            }            catch            {                return IntPtr.Zero;            }        }                /// <summary>        /// 释放VLC播放资源索引        /// </summary>        /// <param name="libvlc_instance">VLC 全局变量</param>        public static void Release_Media_Instance(libvlc_instance_t libvlc_instance)        {            try            {                if (libvlc_instance != IntPtr.Zero ||                    libvlc_instance != null)                {                    SafeNativeMethods.libvlc_release(libvlc_instance);                }                libvlc_instance = IntPtr.Zero;            }            catch (Exception)            {                libvlc_instance = IntPtr.Zero;            }        }                /// <summary>        /// 创建VLC播放器        /// </summary>        /// <param name="libvlc_instance">VLC 全局变量</param>        /// <param name="handle">VLC MediaPlayer需要绑定显示的窗体句柄</param>        /// <returns></returns>        public static libvlc_media_player_t Create_MediaPlayer(libvlc_instance_t libvlc_instance, IntPtr handle)        {            libvlc_media_player_t libvlc_media_player = IntPtr.Zero;            try            {                if (libvlc_instance == IntPtr.Zero ||                    libvlc_instance == null ||                    handle == IntPtr.Zero ||                    handle == null)                {                    return IntPtr.Zero;                }                //创建播放器                libvlc_media_player = SafeNativeMethods.libvlc_media_player_new(libvlc_instance);                if (libvlc_media_player == null || libvlc_media_player == IntPtr.Zero)                {                    return IntPtr.Zero;                }                //设置播放窗口                            SafeNativeMethods.libvlc_media_player_set_hwnd(libvlc_media_player, (int)handle);                return libvlc_media_player;            }            catch            {                SafeNativeMethods.libvlc_media_player_release(libvlc_media_player);                return IntPtr.Zero;            }        }                /// <summary>        /// 释放媒体播放器        /// </summary>        /// <param name="libvlc_media_player">VLC MediaPlayer变量</param>        public static void Release_MediaPlayer(libvlc_media_player_t libvlc_media_player)        {            try            {                if (libvlc_media_player != IntPtr.Zero ||                    libvlc_media_player != null)                {                    if (SafeNativeMethods.libvlc_media_player_is_playing(libvlc_media_player))                    {                        SafeNativeMethods.libvlc_media_player_stop(libvlc_media_player);                    }                    SafeNativeMethods.libvlc_media_player_release(libvlc_media_player);                }                libvlc_media_player = IntPtr.Zero;            }            catch (Exception)            {                libvlc_media_player = IntPtr.Zero;            }        }                /// <summary>        /// 播放网络媒体        /// </summary>        /// <param name="libvlc_instance">VLC 全局变量</param>        /// <param name="libvlc_media_player">VLC MediaPlayer变量</param>        /// <param name="url">网络视频URL，支持http、rtp、udp等格式的URL播放</param>        /// <returns></returns>        public static bool NetWork_Media_Play(libvlc_instance_t libvlc_instance, libvlc_media_player_t libvlc_media_player, string url)        {            IntPtr pMrl = IntPtr.Zero;            libvlc_media_t libvlc_media = IntPtr.Zero;            try            {                if (url == null ||                    libvlc_instance == IntPtr.Zero ||                    libvlc_instance == null ||                    libvlc_media_player == IntPtr.Zero ||                    libvlc_media_player == null)                {                    return false;                }                pMrl = StrToIntPtr(url);                if (pMrl == null || pMrl == IntPtr.Zero)                {                    return false;                }                //播放网络文件                libvlc_media = SafeNativeMethods.libvlc_media_new_location(libvlc_instance, pMrl);                                if (libvlc_media == null || libvlc_media == IntPtr.Zero)                {                    return false;                }                //将Media绑定到播放器上                SafeNativeMethods.libvlc_media_player_set_media(libvlc_media_player, libvlc_media);                //释放libvlc_media资源                SafeNativeMethods.libvlc_media_release(libvlc_media);                libvlc_media = IntPtr.Zero;                if (0 != SafeNativeMethods.libvlc_media_player_play(libvlc_media_player))                {                    return false;                }                //休眠指定时间                Thread.Sleep(500);                return true;            }            catch (Exception)            {                //释放libvlc_media资源                if (libvlc_media != IntPtr.Zero)                {                    SafeNativeMethods.libvlc_media_release(libvlc_media);                }                libvlc_media = IntPtr.Zero;                                return false;            }        }                      /// <summary>        /// 暂停或恢复视频        /// </summary>        /// <param name="libvlc_media_player">VLC MediaPlayer变量</param>        /// <returns></returns>        public static bool MediaPlayer_Pause(libvlc_media_player_t libvlc_media_player)        {            try            {                if (libvlc_media_player == IntPtr.Zero ||                    libvlc_media_player == null)                {                    return false;                }                if (SafeNativeMethods.libvlc_media_player_can_pause(libvlc_media_player))                {                    SafeNativeMethods.libvlc_media_player_pause(libvlc_media_player);                    return true;                }                else                {                    return false;                }            }            catch (Exception)            {                return false;            }        }                /// <summary>        /// 停止播放        /// </summary>        /// <param name="libvlc_media_player">VLC MediaPlayer变量</param>        /// <returns></returns>        public static bool MediaPlayer_Stop(libvlc_media_player_t libvlc_media_player)        {            try            {                if (libvlc_media_player == IntPtr.Zero ||                    libvlc_media_player == null)                {                    return false;                }                SafeNativeMethods.libvlc_media_player_stop(libvlc_media_player);                return true;            }            catch (Exception)            {                return false;            }        }                /// <summary>        /// 快进        /// </summary>        /// <param name="libvlc_media_player">VLC MediaPlayer变量</param>        /// <returns></returns>        public static bool MediaPlayer_Forward(libvlc_media_player_t libvlc_media_player)        {            double time = 0;            try            {                if (libvlc_media_player == IntPtr.Zero ||                    libvlc_media_player == null)                {                    return false;                }                if (SafeNativeMethods.libvlc_media_player_is_seekable(libvlc_media_player))                {                    time = SafeNativeMethods.libvlc_media_player_get_time(libvlc_media_player) / 1000.0;                    if (time == -1)                    {                        return false;                    }                    SafeNativeMethods.libvlc_media_player_set_time(libvlc_media_player, (Int64)((time + 30) * 1000));                    return true;                }                else                {                    return false;                }            }            catch (Exception)            {                return false;            }        }                /// <summary>        /// 快退        /// </summary>        /// <param name="libvlc_media_player">VLC MediaPlayer变量</param>        /// <returns></returns>        public static bool MediaPlayer_Back(libvlc_media_player_t libvlc_media_player)        {            double time = 0;            try            {                if (libvlc_media_player == IntPtr.Zero ||                    libvlc_media_player == null)                {                    return false;                }                if (SafeNativeMethods.libvlc_media_player_is_seekable(libvlc_media_player))                {                    time = SafeNativeMethods.libvlc_media_player_get_time(libvlc_media_player) / 1000.0;                    if (time == -1)                    {                        return false;                    }                    if (time - 30 < 0)                    {                        SafeNativeMethods.libvlc_media_player_set_time(libvlc_media_player, (Int64)(1 * 1000));                    }                    else                    {                        SafeNativeMethods.libvlc_media_player_set_time(libvlc_media_player, (Int64)((time - 30) * 1000));                    }                    return true;                }                else                {                    return false;                }            }            catch (Exception)            {                return false;            }        }                            /// <summary>        /// VLC MediaPlayer是否在播放        /// </summary>        /// <param name="libvlc_media_player">VLC MediaPlayer变量</param>        /// <returns></returns>        public static bool MediaPlayer_IsPlaying(libvlc_media_player_t libvlc_media_player)        {            try            {                if (libvlc_media_player == IntPtr.Zero ||                    libvlc_media_player == null)                {                    return false;                }                return SafeNativeMethods.libvlc_media_player_is_playing(libvlc_media_player);            }            catch (Exception)            {                return false;            }        }                /// <summary>        /// 录制快照        /// </summary>        /// <param name="libvlc_media_player">VLC MediaPlayer变量</param>        /// <param name="path">快照要存放的路径</param>        /// <param name="name">快照保存的文件名称</param>        /// <returns></returns>        public static bool TakeSnapShot(libvlc_media_player_t libvlc_media_player, string path, string name)        {            try            {                string snap_shot_path = null;                if (libvlc_media_player == IntPtr.Zero ||                    libvlc_media_player == null)                {                    return false;                }                if (!Directory.Exists(path))                {                    Directory.CreateDirectory(path);                }                snap_shot_path = path + "\\" + name;                if (0 == SafeNativeMethods.libvlc_video_take_snapshot(libvlc_media_player, 0, snap_shot_path.ToCharArray(), 0, 0))                {                    return true;                }                else                {                    return false;                }            }            catch (Exception)            {                return false;            }        }        /// <summary>        /// 获取信息        /// </summary>        /// <param name="libvlc_media_player"></param>        /// <returns></returns>        public static bool GetMedia(libvlc_media_player_t libvlc_media_player)        {            libvlc_media_t media = IntPtr.Zero;            try            {                if (libvlc_media_player == IntPtr.Zero ||                    libvlc_media_player == null)                {                    return false;                }                media = SafeNativeMethods.libvlc_media_player_get_media(libvlc_media_player);                if (media == IntPtr.Zero || media == null)                {                    return false;                }                else                {                    return true;                }            }            catch(Exception)            {                return false;            }        }        /// <summary>        /// 获取已经显示的图片数        /// </summary>        /// <param name="libvlc_media_player"></param>        /// <returns></returns>        public static int GetDisplayedPictures(libvlc_media_player_t libvlc_media_player)        {            libvlc_media_t media = IntPtr.Zero;            libvlc_media_stats_t media_stats = new libvlc_media_stats_t();            try            {                if (libvlc_media_player == IntPtr.Zero ||                    libvlc_media_player == null)                {                    return 0;                }                media = SafeNativeMethods.libvlc_media_player_get_media(libvlc_media_player);                if (media == IntPtr.Zero || media == null)                {                    return 0;                }                if (1 == SafeNativeMethods.libvlc_media_get_stats(media, ref media_stats))                {                    return media_stats.i_displayed_pictures;                }                else                {                    return 0;                }            }            catch (Exception)            {                return 0;            }        }        /// <summary>        /// 设置全屏        /// </summary>        /// <param name="libvlc_media_player"></param>        /// <param name="isFullScreen"></param>        public static bool SetFullScreen(libvlc_media_player_t libvlc_media_player, int isFullScreen)        {            try            {                if (libvlc_media_player == IntPtr.Zero ||                    libvlc_media_player == null)                {                    return false;                }                SafeNativeMethods.libvlc_set_fullscreen(libvlc_media_player, isFullScreen);                return true;            }            catch (Exception)            {                return false;            }        }        #endregion        #region 私有函数        //将string []转换为IntPtr        public static IntPtr StrToIntPtr(string[] args)        {            try            {                IntPtr ip_args = IntPtr.Zero;                PointerToArrayOfPointerHelper argv = new PointerToArrayOfPointerHelper();                argv.pointers = new IntPtr[11];                for (int i = 0; i < args.Length; i++)                {                    argv.pointers[i] = Marshal.StringToHGlobalAnsi(args[i]);                }                int size = Marshal.SizeOf(typeof(PointerToArrayOfPointerHelper));                ip_args = Marshal.AllocHGlobal(size);                Marshal.StructureToPtr(argv, ip_args, false);                return ip_args;            }            catch (Exception)            {                return IntPtr.Zero;            }        }        //将string转换为IntPtr        private static IntPtr StrToIntPtr(string url)        {            try            {                if(string.IsNullOrEmpty(url))                {                    return IntPtr.Zero;                }                IntPtr pMrl = IntPtr.Zero;                byte[] bytes = Encoding.UTF8.GetBytes(url);                pMrl = Marshal.AllocHGlobal(bytes.Length + 1);                Marshal.Copy(bytes, 0, pMrl, bytes.Length);                Marshal.WriteByte(pMrl, bytes.Length, 0);                return pMrl;            }            catch (Exception)            {                return IntPtr.Zero;            }        }        #endregion        #region 导入库函数        [SuppressUnmanagedCodeSecurity]        internal static class SafeNativeMethods        {            // 创建一个libvlc实例，它是引用计数的            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern libvlc_instance_t libvlc_new(int argc, IntPtr argv);            // 释放libvlc实例            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern void libvlc_release(libvlc_instance_t libvlc_instance);            //获取libvlc的版本            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern String libvlc_get_version();            //从视频来源(例如http、rtsp)构建一个libvlc_meida            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern libvlc_media_t libvlc_media_new_location(libvlc_instance_t libvlc_instance, IntPtr path);            //从本地文件路径构建一个libvlc_media            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern libvlc_media_t libvlc_media_new_path(libvlc_instance_t libvlc_instance, IntPtr path);            //释放libvlc_media            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern void libvlc_media_release(libvlc_media_t libvlc_media_inst);            // 创建一个空的播放器            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern libvlc_media_player_t libvlc_media_player_new(libvlc_instance_t libvlc_instance);            //从libvlc_media构建播放器            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern libvlc_media_player_t libvlc_media_player_new_from_media(libvlc_media_t libvlc_media);            //释放播放器资源            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern void libvlc_media_player_release(libvlc_media_player_t libvlc_mediaplayer);            // 将视频(libvlc_media)绑定到播放器上            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern void libvlc_media_player_set_media(libvlc_media_player_t libvlc_media_player, libvlc_media_t libvlc_media);            // 设置图像输出的窗口            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern void libvlc_media_player_set_hwnd(libvlc_media_player_t libvlc_mediaplayer, Int32 drawable);            //播放器播放            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern int libvlc_media_player_play(libvlc_media_player_t libvlc_mediaplayer);            //播放器暂停            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern void libvlc_media_player_pause(libvlc_media_player_t libvlc_mediaplayer);            //播放器停止            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern void libvlc_media_player_stop(libvlc_media_player_t libvlc_mediaplayer);            // 解析视频资源的媒体信息(如时长等)            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern void libvlc_media_parse(libvlc_media_t 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)]            internal static extern Int64 libvlc_media_get_duration(libvlc_media_t libvlc_media);            // 当前播放时间            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern Int64 libvlc_media_player_get_time(libvlc_media_player_t libvlc_mediaplayer);            // 设置播放时间            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern void libvlc_media_player_set_time(libvlc_media_player_t libvlc_mediaplayer, Int64 time);            // 获取音量            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern int libvlc_audio_get_volume(libvlc_media_player_t libvlc_media_player);            //设置音量            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern void libvlc_audio_set_volume(libvlc_media_player_t libvlc_media_player, int volume);            // 设置全屏            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern void libvlc_set_fullscreen(libvlc_media_player_t libvlc_media_player, int isFullScreen);            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern int libvlc_get_fullscreen(libvlc_media_player_t libvlc_media_player);            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern void libvlc_toggle_fullscreen(libvlc_media_player_t libvlc_media_player);            //判断播放时是否在播放            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern bool libvlc_media_player_is_playing(libvlc_media_player_t libvlc_media_player);            //判断播放时是否能够Seek            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern bool libvlc_media_player_is_seekable(libvlc_media_player_t libvlc_media_player);            //判断播放时是否能够Pause            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern bool libvlc_media_player_can_pause(libvlc_media_player_t libvlc_media_player);            //判断播放器是否可以播放            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern int libvlc_media_player_will_play(libvlc_media_player_t libvlc_media_player);            //进行快照            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern int libvlc_video_take_snapshot(libvlc_media_player_t libvlc_media_player, int num, char[] filepath, int i_width, int i_height);            //获取Media信息            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern libvlc_media_t libvlc_media_player_get_media(libvlc_media_player_t libvlc_media_player);            //获取媒体信息            [DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]            internal static extern int libvlc_media_get_stats(libvlc_media_t libvlc_media, ref libvlc_media_stats_t lib_vlc_media_stats);        }        #endregion    }}