Index: uspace/lib/pcm/include/pcm/format.h
===================================================================
--- uspace/lib/pcm/include/pcm/format.h	(revision 3869c596514bee286166c5bb5cee3ebc8fa326b3)
+++ uspace/lib/pcm/include/pcm/format.h	(revision 57b28f9b270946b5cb380ba577e373a3d7a66217)
@@ -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)