Index: uspace/lib/pcm/include/pcm/format.h
===================================================================
--- uspace/lib/pcm/include/pcm/format.h	(revision 20d77fbdda6dde00b2bbf1db077332ca4aeea104)
+++ uspace/lib/pcm/include/pcm/format.h	(revision 2a64082244e2aa0a67d47ef2d7c51f03b322b74a)
@@ -64,4 +64,11 @@
 }
 
+static inline suseconds_t pcm_format_size_to_frames(size_t size,
+    const pcm_format_t *a)
+{
+	return pcm_sample_format_size_to_frames(size, a->channels,
+	    a->sample_format);
+}
+
 static inline suseconds_t pcm_format_size_to_usec(size_t size,
     const pcm_format_t *a)