ersatztv/ErsatzTV/Services/RunOnce/PlatformSettingsService.cs

using System.Runtime.InteropServices;
using ErsatzTV.Core.Interfaces.Metadata;
using ErsatzTV.FFmpeg.Capabilities;
using ErsatzTV.FFmpeg.Runtime;
using Microsoft.Extensions.Caching.Memory;

namespace ErsatzTV.Services.RunOnce;

public class PlatformSettingsService(IServiceScopeFactory serviceScopeFactory) : BackgroundService
{
    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        await Task.Yield();

        using IServiceScope scope = serviceScopeFactory.CreateScope();
        IRuntimeInfo runtimeInfo = scope.ServiceProvider.GetRequiredService<IRuntimeInfo>();
        if (runtimeInfo != null && runtimeInfo.IsOSPlatform(OSPlatform.Linux))
        {
            if (Directory.Exists("/dev/dri"))
            {
                ILocalFileSystem localFileSystem = scope.ServiceProvider.GetRequiredService<ILocalFileSystem>();
                IMemoryCache memoryCache = scope.ServiceProvider.GetRequiredService<IMemoryCache>();

                var devices = localFileSystem.ListFiles("/dev/dri")
                    .Filter(
                        s => s.StartsWith("/dev/dri/render", StringComparison.OrdinalIgnoreCase)
                             || s.StartsWith("/dev/dri/card", StringComparison.OrdinalIgnoreCase))
                    .ToList();

                memoryCache.Set("ffmpeg.render_devices", devices);
            }

            IHardwareCapabilitiesFactory hardwareCapabilitiesFactory =
                scope.ServiceProvider.GetRequiredService<IHardwareCapabilitiesFactory>();
            if (hardwareCapabilitiesFactory != null)
            {
                IMemoryCache memoryCache = scope.ServiceProvider.GetRequiredService<IMemoryCache>();

                List<string> displays = await hardwareCapabilitiesFactory.GetVaapiDisplays();
                memoryCache.Set("ffmpeg.vaapi_displays", displays);
            }
        }
    }
}