using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using VisioForge.Shared.NAudio.CoreAudioApi;
using VisioForge.Shared.NAudio.Wave;

namespace Common.system
{
    public class FFMpeg
    {
        Process myProcess = null;

        public void RunFFmpeg(string PathName)
        {

            Process[] KillProcessArray = Process.GetProcessesByName("ffmpeg");
            Debug.WriteLine(KillProcessArray.Length.ToString());
            foreach (var KillProcess in KillProcessArray)
            {
                KillProcess.Kill();
            }
            myProcess = new Process();
            string MicrophoneName = GetMicrophone();
            myProcess.StartInfo.FileName = FileToolsCommon.GetFileAbsolutePath(@"/ffmpeg/bin/ffmpeg.exe");   //ffmpeg.exe的绝对路径
            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 -f avi " + PathName;  //ffmpeg的参数

            }
            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();

        }

        public void StopFFmpeg()
        {
            //Thread.Sleep(3000);
            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();
            myProcess.Dispose();
            myProcess = null;
            //myProcess.Kill();
        }

        private void Output(object sendProcess, DataReceivedEventArgs output)
        {
            if (!String.IsNullOrEmpty(output.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 "";
            }
        }
    }
}