Notification sound added. Docs updated.

internal/sound/pulse.go

@@ -36,7 +36,9 @@ func open_pulse(s *Service, _ string) error {
 	if err != nil {
 		return fmt.Errorf("connect sound server: %w", err)
 	}
-	stream, err := client.NewPlayback(pulse.Float32Reader(s.read_samples), pulse.PlaybackStereo, pulse.PlaybackSampleRate(sampleRate), pulse.PlaybackLatency(0.02), pulse.PlaybackMediaName("Fenrir sound cues"))
+	drainRequests := make(chan *notificationPlayback, 1)
+	read := func(samples []float32) (int, error) { return s.read_pulse_samples(samples, drainRequests) }
+	stream, err := client.NewPlayback(pulse.Float32Reader(read), pulse.PlaybackStereo, pulse.PlaybackSampleRate(sampleRate), pulse.PlaybackLatency(0.02), pulse.PlaybackMediaName("Fenrir sound cues"))
 	if err != nil {
 		client.Close()
 		return err
@@ -56,6 +58,11 @@ func open_pulse(s *Service, _ string) error {
 			select {
 			case <-s.done:
 				return
+			case request := <-drainRequests:
+				if err := s.drain_notification(request, s.drainBackend); err != nil {
+					s.errors <- fmt.Errorf("notification sound drain: %w", err)
+					return
+				}
 			case <-tick.C:
 				if stream.Closed() {
 					s.errors <- fmt.Errorf("sound server connection closed")