using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;

using VisioForge.Shared.NAudio.CoreAudioApi;
using VisioForge.Shared.NAudio.Wave;

namespace Common.system
{
    /// <summary>
    /// ffmpeg帮助类
    /// 创建人：赵耀
    /// 创建时间：：2020年8月22日
    /// 需要安装\ffmpeg\bin\Setup Screen Capturer Recorder v0.12.10.exe
    /// 本地调试需要配置环境变量 将ffmpeg.exe位置配置到环境变量的path中
    /// </summary>
    public class FFMpeg
    {
        Process myProcess = null;
        /// <summary>
        /// ffmpeg输出日志文件地址  每个文件2MB左右
        /// </summary>
        string LogPath = "";
        /// <summary>
        /// 录制屏幕
        /// </summary>
        /// <param name="FilePath">文件存储路径</param>
        public void StartRecordingVideo(string FilePath)
        {
            //路径
            string Path = FileToolsCommon.GetDirectoryName(FilePath) + @"\";
            string Extension = FileToolsCommon.GetIOExtension(FilePath);//扩展名
            //文件保存路径
            string PathName = GetFilePathName(FilePath);
            Process[] KillProcessArray = Process.GetProcessesByName("ffmpeg");
            Debug.WriteLine(KillProcessArray.Length.ToString());
            foreach (var KillProcess in KillProcessArray)
            {
                KillProcess.Kill();
            }
            myProcess = new Process();
            LogPath = CreateffmpegLog();
            string MicrophoneName = GetMicrophone();
            myProcess.StartInfo.FileName = FileToolsCommon.GetFileAbsolutePath(@"/ffmpeg/bin/ffmpeg.exe");   //ffmpeg.exe的绝对路径
            switch (Extension.ToUpper())
            {
                case "MP4":
                    if (string.IsNullOrWhiteSpace(MicrophoneName))
                    {
                        myProcess.StartInfo.Arguments = "-f dshow -i video=\"screen-capture-recorder\" -f dshow -i audio=\"virtual-audio-capturer\" -vcodec libx264 -acodec libmp3lame -r 15 -crf 22 -f avi " + PathName;  //ffmpeg的参数
                    }
                    else
                    {
                        myProcess.StartInfo.Arguments = "-f dshow -i audio=\"virtual-audio-capturer\" -f dshow -i audio=\"" +
                            MicrophoneName + "\" -filter_complex amix=inputs=2:duration=first:dropout_transition=2 -f dshow -i video=\"screen-capture-recorder\" -pix_fmt yuv420p -vcodec h264 -preset:v ultrafast -tune:v zerolatency -acodec aac -ar 44100 -ac 2 " + PathName;  //ffmpeg的参数
                    }
                    break;
                case "AVI":
                case "FLV":
                    if (string.IsNullOrWhiteSpace(MicrophoneName))
                    {
                        myProcess.StartInfo.Arguments = "-f dshow -i video=\"screen-capture-recorder\" -f dshow -i audio=\"virtual-audio-capturer\" -vcodec libx264 -acodec libmp3lame -r 15 -crf 22 -f " + Extension.ToLower() + " " + PathName;  //ffmpeg的参数
                    }
                    else
                    {
                        myProcess.StartInfo.Arguments = "-f dshow -i audio=\"virtual-audio-capturer\" -f dshow -i audio=\"" +
                            MicrophoneName + "\" -filter_complex amix=inputs=2:duration=first:dropout_transition=2 -f dshow -i video=\"screen-capture-recorder\" -pix_fmt yuv420p -vcodec h264 -preset:v ultrafast -tune:v zerolatency -acodec aac -ar 44100 -ac 2 -f " + Extension.ToLower() + " " + PathName;  //ffmpeg的参数
                    }
                    break;
                default:
                    if (string.IsNullOrWhiteSpace(MicrophoneName))
                    {
                        myProcess.StartInfo.Arguments = "-f dshow -i video=\"screen-capture-recorder\" -f dshow -i audio=\"virtual-audio-capturer\" -vcodec libx264 -acodec libmp3lame -r 15 -crf 22 -f avi " + PathName;  //ffmpeg的参数
                    }
                    else
                    {
                        myProcess.StartInfo.Arguments = "-f dshow -i audio=\"virtual-audio-capturer\" -f dshow -i audio=\"" +
                            MicrophoneName + "\" -filter_complex amix=inputs=2:duration=first:dropout_transition=2 -f dshow -i video=\"screen-capture-recorder\" -pix_fmt yuv420p -vcodec h264 -preset:v ultrafast -tune:v zerolatency -acodec aac -ar 44100 -ac 2 " + PathName;  //ffmpeg的参数
                    }
                    break;
            }
            myProcess.StartInfo.UseShellExecute = false;           //不使用操作系统外壳程序启动
            myProcess.StartInfo.RedirectStandardError = true;      //重定向标准错误输出
            myProcess.StartInfo.CreateNoWindow = true;             //不显示程序窗口
            myProcess.StartInfo.RedirectStandardInput = true;      //用于模拟该进程控制台的输入
            myProcess.ErrorDataReceived += new DataReceivedEventHandler(Output);
            myProcess.Start();
            myProcess.BeginErrorReadLine();
        }

        /// <summary>
        /// 录制音频
        /// </summary>
        /// <param name="Mp3Path">MP3音频位置</param>
        private void StartRecordingAudio(string Mp3Path)
        {
            Process[] KillProcessArray = Process.GetProcessesByName("ffmpeg");
            Debug.WriteLine(KillProcessArray.Length.ToString());
            foreach (var KillProcess in KillProcessArray)
            {
                KillProcess.Kill();
            }
            myProcess = new Process();
            LogPath = CreateffmpegLog();
            this.myProcess.StartInfo.FileName = FileToolsCommon.GetFileAbsolutePath(@"/ffmpeg/bin/ffmpeg.exe");   //ffmpeg.exe的绝对路径
            string MicrophoneName = GetMicrophone();
            if (string.IsNullOrWhiteSpace(MicrophoneName))
            {
                myProcess.StartInfo.Arguments = "-f dshow -i audio=\"virtual-audio-capturer\" " + Mp3Path;
            }
            else
            {
                myProcess.StartInfo.Arguments = "-f dshow -i audio=\"virtual-audio-capturer\"  -f dshow -i audio=\"" +
                        MicrophoneName + "\" -filter_complex amix=inputs=2:duration=first:dropout_transition=2 " + Mp3Path;
            }
            myProcess.StartInfo.UseShellExecute = false;           //不使用操作系统外壳程序启动
            myProcess.StartInfo.RedirectStandardError = true;      //重定向标准错误输出
            myProcess.StartInfo.CreateNoWindow = true;             //不显示程序窗口
            myProcess.StartInfo.RedirectStandardInput = true;    //用于模拟该进程控制台的输入
            //外部程序(这里是FFMPEG)输出流时候产生的事件,这里是把流的处理过程转移到下面的方法中,详细请查阅MSDN
            myProcess.ErrorDataReceived += new DataReceivedEventHandler(Output);
            myProcess.Start();                //启动线程
            myProcess.BeginErrorReadLine();   //开始异步读取
        }

        /// <summary>
        /// 暂停录制
        /// </summary>
        public void SuspendFFmpeg()
        {
            if (myProcess == null)
                return;
            myProcess.StandardInput.WriteLine("q");//在这个进程的控制台中模拟输入q,用于暂停录制
            myProcess.Close();//关闭进程
            myProcess.Dispose();//释放资源
            myProcess = null;
            //myProcess.Kill();
        }

        /// <summary>
        /// 停止录制并合成文件
        /// </summary>
        /// <param name="FilePath">文件存储路径 必须与开始时的路径完全一致</param>
        public void StopFFmpeg(string FilePath)
        {
            //文件完整路径
            if (myProcess == null)
                return;
            myProcess.StandardInput.WriteLine("q");//在这个进程的控制台中模拟输入q,用于暂停录制
            myProcess.Close();//关闭进程
            myProcess.Dispose();//释放资源
            myProcess = null;
            Thread t1 = new Thread(MergeVideoOrAudio);
            t1.Start(FilePath);
            //文件合成
        }

        /// <summary>
        /// 图片音频合成视频
        /// </summary>
        /// <param name="ImageListPath">图片列表位置 命名为1.png 2.png</param>
        /// <param name="Mp3Path">MP3音频位置</param>
        /// <param name="VideoSavePath">视频保存位置</param>
        /// <param name="Frequency">每秒帧率</param>
        /// <param name="VideoWidth">视频宽度</param>
        /// <param name="VideoHeight">视频高度</param>
        private void SynthesisVideo(string ImageListPath, string Mp3Path, string VideoSavePath, int Frequency, int VideoWidth, int VideoHeight)
        {
            Thread thread = new Thread(delegate ()
            {
                //// 允许不同线程间的调用
                //Control.CheckForIllegalCrossThreadCalls = false;
                Thread.Sleep(500);
                string Extension = FileToolsCommon.GetIOExtension(VideoSavePath);//扩展名
                Process[] KillProcessArray = Process.GetProcessesByName("ffmpeg");
                Debug.WriteLine(KillProcessArray.Length.ToString());
                foreach (var KillProcess in KillProcessArray)
                {
                    KillProcess.Kill();
                }
                myProcess = new Process();
                LogPath = CreateffmpegLog();
                this.myProcess.StartInfo.FileName = FileToolsCommon.GetFileAbsolutePath(@"/ffmpeg/bin/ffmpeg.exe");   //ffmpeg.exe的绝对路径
                switch (Extension.ToUpper())
                {
                    case "MP4":
                        myProcess.StartInfo.Arguments = @"-y -r " + Frequency + " -i " +
                            ImageListPath + @"%d.png -i " +
                            Mp3Path + @" -s " + VideoWidth + "x" + VideoHeight + " -vcodec mpeg4 " +
                            VideoSavePath;
                        break;
                    case "AVI":
                        myProcess.StartInfo.Arguments = @"-y -r " + Frequency + " -i " +
                            ImageListPath + @"%d.png -i " +
                            Mp3Path + @" -s " + VideoWidth + "x" + VideoHeight + " -f AVI " +
                            VideoSavePath;
                        break;
                    case "FLV":
                        myProcess.StartInfo.Arguments = @"-y -r " + Frequency + " -i " +
                            ImageListPath + @"%d.png -i " +
                            Mp3Path + @" -s " + VideoWidth + "x" + VideoHeight + " -f FLV " +
                            VideoSavePath;
                        break;
                    default:
                        myProcess.StartInfo.Arguments = @"-y -r " + Frequency + " -i " +
                            ImageListPath + @"%d.png -i " +
                            Mp3Path + @" -s " + VideoWidth + "x" + VideoHeight + " -vcodec mpeg4 " +
                            VideoSavePath;
                        break;
                }
                myProcess.StartInfo.UseShellExecute = false;           //不使用操作系统外壳程序启动
                myProcess.StartInfo.RedirectStandardError = true;      //重定向标准错误输出
                myProcess.StartInfo.CreateNoWindow = true;             //不显示程序窗口
                myProcess.StartInfo.RedirectStandardInput = true;      //用于模拟该进程控制台的输入
                                                                       //外部程序(这里是FFMPEG)输出流时候产生的事件,这里是把流的处理过程转移到下面的方法中,详细请查阅MSDN
                myProcess.ErrorDataReceived += new DataReceivedEventHandler(Output);
                myProcess.Start();                 //启动线程
                myProcess.BeginErrorReadLine();    //开始异步读取
                myProcess.WaitForExit();           //阻塞等待进程结束
                myProcess.Close();                 //关闭进程
                myProcess.Dispose();               //释放资源
                                                   //生成视频后删除图片保存列表
                FileToolsCommon.DeleteDirectory(ImageListPath);
            });
        }

        /// <summary>
        /// 视频音频合成
        /// </summary>
        /// <param name="FilePath">存储路径</param>
        void MergeVideoOrAudio(object FilePathobj)
        {
            Thread.Sleep(500);
            //路径
            string FilePath = (string)FilePathobj;
            string Path = FileToolsCommon.GetDirectoryName(FilePath) + @"\";
            Process[] KillProcessArray = Process.GetProcessesByName("ffmpeg");
            Debug.WriteLine(KillProcessArray.Length.ToString());
            foreach (var KillProcess in KillProcessArray)
            {
                KillProcess.Kill();
            }
            myProcess = new Process();
            LogPath = CreateffmpegLog();
            this.myProcess.StartInfo.FileName = FileToolsCommon.GetFileAbsolutePath(@"/ffmpeg/bin/ffmpeg.exe");   //ffmpeg.exe的绝对路径
            myProcess.StartInfo.Arguments = "-f concat  -safe 0 -i " + Path + "temp/filelist.d -c copy " + FilePath;
            myProcess.StartInfo.UseShellExecute = false;           //不使用操作系统外壳程序启动
            myProcess.StartInfo.RedirectStandardError = true;      //重定向标准错误输出
            myProcess.StartInfo.CreateNoWindow = true;             //不显示程序窗口
            myProcess.StartInfo.RedirectStandardInput = true;      //用于模拟该进程控制台的输入
            //外部程序(这里是FFMPEG)输出流时候产生的事件,这里是把流的处理过程转移到下面的方法中,详细请查阅MSDN
            myProcess.ErrorDataReceived += new DataReceivedEventHandler(Output);
            myProcess.Start();                 //启动线程
            myProcess.BeginErrorReadLine();    //开始异步读取
            myProcess.WaitForExit();           //阻塞等待进程结束
            myProcess.Close();                 //关闭进程
            myProcess.Dispose();               //释放资源
        }

        /// <summary>
        /// 获取文件完整路径
        /// </summary>
        /// <param name="FilePath">文件路径</param>
        /// <returns></returns>
        string GetFilePathName(string FilePath)
        {
            //路径
            string Path = FileToolsCommon.GetDirectoryName(FilePath) + @"\";
            //Path.GetFileName(FilePath);//获取文件名
            string Extension = FileToolsCommon.GetIOExtension(FilePath);//扩展名
            string tempFilePath = Path + "temp/";
            //创建临时目录
            FileToolsCommon.CreateDirectory(tempFilePath);
            //创建记录文件
            if (!FileToolsCommon.IsExistFile(tempFilePath + "filelist.d"))
            {
                FileToolsCommon.CreateFile(tempFilePath + "filelist.d");
            }
            int num = 1;
            string CompleteFilePath = tempFilePath + num + Extension;
            while (FileToolsCommon.IsExistFile(CompleteFilePath))
            {
                num++;
                CompleteFilePath = tempFilePath + num + Extension;
            }
            FileToolsCommon.AppendText(tempFilePath + "filelist.d", "file ./" + num + Extension + "\r\n");
            return CompleteFilePath;
        }

        /// <summary>
        /// 生成缩略图
        /// </summary>
        /// <param name="VideoPath">视频地址</param>
        /// <param name="ImagePath">图片地址</param>
        void GenerateThumbnails(string VideoPath, string ImagePath)
        {
            Process[] KillProcessArray = Process.GetProcessesByName("ffmpeg");
            Debug.WriteLine(KillProcessArray.Length.ToString());
            foreach (var KillProcess in KillProcessArray)
            {
                KillProcess.Kill();
            }
            myProcess = new Process();
            LogPath = CreateffmpegLog();
            this.myProcess.StartInfo.FileName = FileToolsCommon.GetFileAbsolutePath(@"/ffmpeg/bin/ffmpeg.exe");   //ffmpeg.exe的绝对路径
            //myProcess.StartInfo.Arguments = "-i \"" + VideoPath + "\" -ss 1 -vframes 1 -r 1 -ac 1 -ab 2 -s " + thubWidth + "*" + thubHeight + " -f image2 \"" + ImagePath + "\"";
            myProcess.StartInfo.Arguments = "-i \"" + VideoPath + "\" -ss 1 -vframes 1 -r 1 -ac 1 -ab 2 -f image2 \"" + ImagePath + "\"";
            myProcess.StartInfo.UseShellExecute = false;           //不使用操作系统外壳程序启动
            myProcess.StartInfo.RedirectStandardError = true;      //重定向标准错误输出
            myProcess.StartInfo.CreateNoWindow = true;             //不显示程序窗口
            myProcess.StartInfo.RedirectStandardInput = true;      //用于模拟该进程控制台的输入
            //外部程序(这里是FFMPEG)输出流时候产生的事件,这里是把流的处理过程转移到下面的方法中,详细请查阅MSDN
            myProcess.ErrorDataReceived += new DataReceivedEventHandler(Output);
            myProcess.Start();                 //启动线程
            myProcess.BeginErrorReadLine();    //开始异步读取
            myProcess.WaitForExit();           //阻塞等待进程结束
            myProcess.Close();                 //关闭进程
            myProcess.Dispose();               //释放资源
        }

        /// <summary>
        /// 创建日志文件
        /// </summary>
        /// <returns></returns>
        string CreateffmpegLog()
        {
            string LogFileName = DateTime.Now.ToString("yyyyMMdd");
            string LogFilePath = FileToolsCommon.GetFileAbsolutePath("/Log/FFMpegLog/");
            FileToolsCommon.CreateDirectory(LogFilePath);
            string LogName = LogFilePath + LogFileName + ".log";
            try
            {
                if (!FileToolsCommon.IsExistFile(LogName))
                {
                    FileToolsCommon.CreateFile(LogName);
                    FileToolsCommon.AppendText(LogName, "\r\n****************************************************************************************************" +
                        "****************************************************************************************************\r\n");
                    return LogName;
                }
                else
                {
                    int num = 0;
                    while (FileToolsCommon.GetFileSizeByMB(LogName) > 2)
                    {
                        num++;
                        LogName = LogFilePath + LogFileName + "_" + num + ".log";
                        FileToolsCommon.CreateFile(LogName);
                    }
                    FileToolsCommon.AppendText(LogName, "\r\n****************************************************************************************************" +
                        "****************************************************************************************************\r\n");
                    return LogName;
                }
            }
            catch (Exception)
            {
                return LogName;
            }
        }

        /// <summary>
        /// 输出结果
        /// </summary>
        /// <param name="sendProcess"></param>
        /// <param name="output"></param>
        private void Output(object sendProcess, DataReceivedEventArgs output)
        {
            if (!String.IsNullOrEmpty(output.Data))
            {
                FileToolsCommon.AppendText(LogPath, output.Data);
            }
        }

        //private void P_ErrorDataReceived(object sender, DataReceivedEventArgs e)
        //{
        //    //+= new DataReceivedEventHandler((s, message) => { Console.WriteLine(message.Data); })
        //    using (StreamWriter fs = new StreamWriter("E:\\项目\\测试\\Wpf测试\\bin\\Debug\\ffmpeg\\log.txt", true))
        //    {
        //        fs.WriteLine(e.Data);
        //        Debug.WriteLine(output.Data.ToString());
        //    }
        //}

        /// <summary>
        /// 获取麦克风
        /// </summary>
        string GetMicrophone()
        {
            List<string> devs = new List<string>();

            MMDeviceEnumerator enumberator = new MMDeviceEnumerator();
            MMDeviceCollection deviceCollection = enumberator.EnumerateAudioEndPoints(DataFlow.Capture, DeviceState.All);
            for (int waveInDevice = 0; waveInDevice < WaveIn.DeviceCount; waveInDevice++)
            {
                WaveInCapabilities deviceInfo = WaveIn.GetCapabilities(waveInDevice);
                foreach (MMDevice device in deviceCollection)
                {
                    try
                    {

                        if (device.FriendlyName.StartsWith(deviceInfo.ProductName))
                        {
                            devs.Add(device.FriendlyName);
                            break;
                        }
                    }
                    catch (Exception)
                    {

                    }
                }
            }
            if (devs.Count > 0)
            {
                return devs[0];
            }
            else
            {
                return "";
            }
        }
    }
}