iot/projects/IoT/IoTServices/SingalDemo/OmxPlayer.cs

using System;
using System.Diagnostics;

namespace SingalDemo
{
    public class OmxPlayer
    {
        private static Process Player;
        private static object lockObject = new object();

        internal static void Play(string file)
        {
            lock (lockObject)
            {
                var args = $"-o local --loop {file}";
                if (Player != null && !Player.HasExited && Player.StartInfo.Arguments == args)
                {
                    Player.StandardInput.Write('p');
                }
                else
                {
                    try
                    {
                        if (Player != null && !Player.HasExited)
                        {
                            Player.StandardInput.Write('q');
                            Player.Kill();
                        }
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine(ex.Message);
                    }
                    Player = new Process
                    {
                        StartInfo = new ProcessStartInfo
                        {
                            FileName = "omxplayer.bin",
                            Arguments = args,
                            RedirectStandardInput = true
                        }
                    };
                    Player.Start();
                }
            }
        }

        internal static void Stop()
        {
            try
            {
                if (Player != null && !Player.HasExited)
                {
                    Player.StandardInput.Write('q');
                    Player.Kill();
                    Process.Start("bash", "-c \"xrefresh -display :0\"");
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }

        internal static void Pause()
        {
            if (Player != null && !Player.HasExited)
            {
                Player.StandardInput.Write('p');
            }
        }

        internal static void SI()
        {
            Control("\x1b\x5b\x43");
        }

        internal static void SD()
        {
            Control("\x1b\x5b\x44");
        }

        internal static void VI()
        {
            Control("+");
        }

        internal static void VD()
        {
            Control("-");
        }

        internal static void Control(string command)
        {
            if (Player != null && !Player.HasExited)
            {
                Player.StandardInput.Write(command);
            }
        }
    }
}