Index: uspace/lib/drv/include/audio_pcm_iface.h
===================================================================
--- uspace/lib/drv/include/audio_pcm_iface.h	(revision aae11d0f1a8c713e8338614802878afa037b5b84)
+++ uspace/lib/drv/include/audio_pcm_iface.h	(revision c04ff9f06fcb37ad251130291d15866ef2cc3d34)
@@ -54,10 +54,12 @@
 } audio_cap_t;
 
-enum {
-	PCM_EVENT_FRAMES_PLAYED = IPC_FIRST_USER_METHOD,
+typedef enum {
+	PCM_EVENT_PLAYBACK_STARTED = IPC_FIRST_USER_METHOD,
+	PCM_EVENT_CAPTURE_STARTED,
+	PCM_EVENT_FRAMES_PLAYED,
 	PCM_EVENT_FRAMES_CAPTURED,
 	PCM_EVENT_PLAYBACK_TERMINATED,
 	PCM_EVENT_CAPTURE_TERMINATED
-};
+} pcm_event_t;
 
 typedef async_sess_t audio_pcm_sess_t;