feat: refactor audio extraction to reusable class

src/StreamShorts.Console/Commands/DefaultCommand.cs

@@ -2,11 +2,13 @@ namespace StreamShorts.Console.Commands;
 
 internal class DefaultCommand(
   IFileSystem fileSystem,
-  IAnsiConsole console
+  IAnsiConsole console,
+  IAudioExtractor audioExtractor
 ) : AsyncCommand<DefaultCommand.Settings>
 {
   private readonly IFileSystem _fileSystem = fileSystem ?? throw new ArgumentNullException(nameof(fileSystem));
   private readonly IAnsiConsole _console = console ?? throw new ArgumentNullException(nameof(console));
+  private readonly IAudioExtractor _audioExtractor = audioExtractor ?? throw new ArgumentNullException(nameof(audioExtractor));
 
   internal class Settings : CommandSettings
   {
@@ -37,9 +39,28 @@ internal class DefaultCommand(
     return base.Validate(context, settings);
   }
 
-  public override Task<int> ExecuteAsync(CommandContext context, Settings settings)
+  public override async Task<int> ExecuteAsync(CommandContext context, Settings settings)
   {
-    _console.Write($"[green]Processing stream:[/] {settings.Stream}");
-    return Task.FromResult(0);
+    _console.MarkupLine($"[blue]Processing stream:[/] {settings.Stream}");
+    var videoStream = _fileSystem.File.OpenRead(settings.Stream);
+
+    Stream? audioStream = null;
+
+    await _console.Status()
+      .Spinner(Spinner.Known.Dots)
+      .StartAsync("Extracting audio...", async ctx =>
+      {
+        audioStream = await _audioExtractor.ExtractMp3FromMp4Async(videoStream).ConfigureAwait(false);
+      });
+
+    if (audioStream is null)
+    {
+      _console.MarkupLine("[red]Failed[/] to extract audio from the stream.");
+      return 1;
+    }
+
+    _console.MarkupLine($"[blue]Audio extracted[/] [green]successfully![/]");
+
+    return 0;
   }
 }