FFMpegCore/FFMpegCore/GlobalFFOptions.cs

using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Text.Json;

namespace FFMpegCore
{
    public static class GlobalFFOptions
    {
        private static readonly string ConfigFile = "ffmpeg.config.json";
        private static FFOptions? _current;

        public static FFOptions Current
        {
            get { return _current ??= LoadFFOptions(); }
        }

        public static void Configure(Action<FFOptions> optionsAction)
        {
            optionsAction?.Invoke(Current);
        }
        public static void Configure(FFOptions ffOptions)
        {
            _current = ffOptions ?? throw new ArgumentNullException(nameof(ffOptions));
        }
        

        public static string GetFFMpegBinaryPath(FFOptions? ffOptions = null) => GetFFBinaryPath("FFMpeg", ffOptions ?? Current);

        public static string GetFFProbeBinaryPath(FFOptions? ffOptions = null) => GetFFBinaryPath("FFProbe", ffOptions ?? Current);

        private static string GetFFBinaryPath(string name, FFOptions ffOptions)
        {
            var ffName = name.ToLowerInvariant();
            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
                ffName += ".exe";

            var target = Environment.Is64BitProcess ? "x64" : "x86";
            if (Directory.Exists(Path.Combine(ffOptions.BinaryFolder, target)))
                ffName = Path.Combine(target, ffName);

            return Path.Combine(ffOptions.BinaryFolder, ffName);
        }

        private static FFOptions LoadFFOptions()
        {
            if (File.Exists(ConfigFile))
            {
                return JsonSerializer.Deserialize<FFOptions>(File.ReadAllText(ConfigFile))!;
            }
            else
            {
                return new FFOptions();
            }
        }
    }
}