Index: uspace/lib/drv/include/audio_pcm_iface.h
===================================================================
--- uspace/lib/drv/include/audio_pcm_iface.h	(revision 018ab5018108207fc0601a6f793a0b0bb0a6995c)
+++ uspace/lib/drv/include/audio_pcm_iface.h	(revision 74c7164652689b33dd6418becb7d4f4e25de4bbc)
@@ -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;