add support for embedded text subtitles (#742)

* first pass at text subtitle support * support text subtitles from movies, music videos and other videos * fixes * qsv fixes * vaapi fixes * update changelog
2022-04-19 12:57:24 -05:00
parent 60965d0961
commit e250e93a8e
68 changed files with 22005 additions and 152 deletions
@@ -0,0 +1,66 @@
+using System.Threading.Channels;
+using Bugsnag;
+using ErsatzTV.Application;
+using ErsatzTV.Application.Subtitles;
+using MediatR;
+
+namespace ErsatzTV.Services;
+
+public class SubtitleWorkerService : BackgroundService
+{
+    private readonly ChannelReader<ISubtitleWorkerRequest> _channel;
+    private readonly ILogger<SubtitleWorkerService> _logger;
+    private readonly IServiceScopeFactory _serviceScopeFactory;
+
+    public SubtitleWorkerService(
+        ChannelReader<ISubtitleWorkerRequest> channel,
+        IServiceScopeFactory serviceScopeFactory,
+        ILogger<SubtitleWorkerService> logger)
+    {
+        _channel = channel;
+        _serviceScopeFactory = serviceScopeFactory;
+        _logger = logger;
+    }
+
+    protected override async Task ExecuteAsync(CancellationToken cancellationToken)
+    {
+        try
+        {
+            _logger.LogInformation("Subtitle worker service started");
+
+            await foreach (ISubtitleWorkerRequest request in _channel.ReadAllAsync(cancellationToken))
+            {
+                using IServiceScope scope = _serviceScopeFactory.CreateScope();
+
+                try
+                {
+                    switch (request)
+                    {
+                        case ExtractEmbeddedSubtitles extractEmbeddedSubtitles:
+                            IMediator mediator = scope.ServiceProvider.GetRequiredService<IMediator>();
+                            await mediator.Send(extractEmbeddedSubtitles, cancellationToken);
+                            break;
+                    }
+                }
+                catch (Exception ex)
+                {
+                    _logger.LogWarning(ex, "Failed to handle subtitle worker request");
+
+                    try
+                    {
+                        IClient client = scope.ServiceProvider.GetRequiredService<IClient>();
+                        client.Notify(ex);
+                    }
+                    catch (Exception)
+                    {
+                        // do nothing
+                    }
+                }
+            }
+        }
+        catch (Exception ex) when (ex is TaskCanceledException or OperationCanceledException)
+        {
+            _logger.LogInformation("Subtitle worker service shutting down");
+        }
+    }
+}