feat: Add FFmpeg audio recording and ydotool typing backends, making them configurable.

Audio/FfmpegAudioRecorder.cs

@@ -0,0 +1,87 @@
+using System;
+using System.Diagnostics;
+using System.IO;
+
+using Toak.Core;
+using Toak.IO;
+using Toak.Core.Interfaces;
+
+namespace Toak.Audio;
+
+public class FfmpegAudioRecorder : IAudioRecorder
+{
+    private readonly string WavPath = Constants.Paths.RecordingWavFile;
+    private readonly IRecordingStateTracker _stateTracker;
+    private readonly INotifications _notifications;
+
+    public FfmpegAudioRecorder(IRecordingStateTracker stateTracker, INotifications notifications)
+    {
+        _stateTracker = stateTracker;
+        _notifications = notifications;
+    }
+
+    public string GetWavPath() => WavPath;
+
+    public void StartRecording()
+    {
+        if (File.Exists(WavPath))
+        {
+            Logger.LogDebug($"Deleting old audio file: {WavPath}");
+            File.Delete(WavPath);
+        }
+
+        Logger.LogDebug("Starting ffmpeg to record audio...");
+
+        var pInfo = new ProcessStartInfo
+        {
+            FileName = Constants.Commands.AudioFfmpeg,
+            Arguments = $"-f pulse -i default -ac 1 -ar 16000 \"{WavPath}\"",
+            UseShellExecute = false,
+            CreateNoWindow = true,
+            RedirectStandardOutput = true,
+            RedirectStandardError = true
+        };
+
+        var process = Process.Start(pInfo);
+        if (process != null)
+        {
+            _stateTracker.SetRecording(process.Id);
+            _notifications.Notify("Recording Started (FFmpeg)");
+        }
+    }
+
+    public void StopRecording()
+    {
+        var pid = _stateTracker.GetRecordingPid();
+        if (pid.HasValue)
+        {
+            Logger.LogDebug($"Found active ffmpeg process with PID {pid.Value}. Attempting to stop...");
+            try
+            {
+                var process = Process.GetProcessById(pid.Value);
+                if (!process.HasExited)
+                {
+                    // Gracefully stop ffmpeg using SIGINT to ensure WAV headers are finalizing cleanly
+                    Process.Start(new ProcessStartInfo
+                    {
+                        FileName = Constants.Commands.ProcessKill,
+                        Arguments = $"-INT {pid.Value}",
+                        CreateNoWindow = true,
+                        UseShellExecute = false
+                    })?.WaitForExit();
+                    
+                    process.WaitForExit(2000); // give it a moment to flush
+                }
+            }
+            catch (Exception ex)
+            {
+                // Process might already be dead
+                Console.WriteLine($"[FfmpegAudioRecorder] Error stopping ffmpeg: {ex.Message}");
+            }
+            finally
+            {
+                _stateTracker.ClearRecording();
+            }
+        }
+    }
+}