Index: uspace/lib/drv/include/audio_pcm_iface.h
===================================================================
--- uspace/lib/drv/include/audio_pcm_iface.h	(revision d86c973619c86de977bf698bcb1ebae602e372ce)
+++ uspace/lib/drv/include/audio_pcm_iface.h	(revision fa91c0f9439c4e8812fbfb112e834da880e5fd06)
@@ -71,4 +71,5 @@
     pcm_sample_format_t *);
 int audio_pcm_query_cap(audio_pcm_sess_t *, audio_cap_t, unsigned *);
+int audio_pcm_get_buffer_pos(audio_pcm_sess_t *, size_t *);
 
 int audio_pcm_get_buffer(audio_pcm_sess_t *, void **, size_t *,
@@ -90,4 +91,5 @@
 	    pcm_sample_format_t *);
 	unsigned (*query_cap)(ddf_fun_t *, audio_cap_t);
+	int (*get_buffer_pos)(ddf_fun_t *, size_t *);
 	int (*get_buffer)(ddf_fun_t *, void **, size_t *);
 	int (*release_buffer)(ddf_fun_t *);