Index: uspace/lib/drv/include/audio_pcm_iface.h
===================================================================
--- uspace/lib/drv/include/audio_pcm_iface.h	(revision 57e8b3ba054d7a008b430e7b6b67994b03197240)
+++ uspace/lib/drv/include/audio_pcm_iface.h	(revision a9aae16e62a6d224ed168129b4de751cdac35a49)
@@ -58,4 +58,7 @@
 
 int audio_pcm_get_info_str(audio_pcm_sess_t *, const char **);
+int audio_pcm_test_format(audio_pcm_sess_t *, unsigned *, unsigned *,
+    pcm_sample_format_t *);
+
 int audio_pcm_get_buffer(audio_pcm_sess_t *, void **, size_t *,
     async_client_conn_t, void *);
@@ -73,4 +76,6 @@
 typedef struct {
 	int (*get_info_str)(ddf_fun_t *, const char **);
+	int (*test_format)(ddf_fun_t *, unsigned *, unsigned *,
+	    pcm_sample_format_t *);
 	int (*get_buffer)(ddf_fun_t *, void **, size_t *);
 	int (*release_buffer)(ddf_fun_t *);