Index: uspace/lib/pcm/include/pcm/format.h
===================================================================
--- uspace/lib/pcm/include/pcm/format.h	(revision b1dfe130f588aa94da97a7dffd925e164fc597c9)
+++ uspace/lib/pcm/include/pcm/format.h	(revision e211ea04fccf33d4cb2092f630a29e893e096a02)
@@ -99,8 +99,8 @@
 }
 void pcm_format_silence(void *dst, size_t size, const pcm_format_t *f);
-int pcm_format_convert_and_mix(void *dst, size_t dst_size, const void *src,
+errno_t pcm_format_convert_and_mix(void *dst, size_t dst_size, const void *src,
     size_t src_size, const pcm_format_t *sf, const pcm_format_t *df);
-int pcm_format_mix(void *dst, const void *src, size_t size, const pcm_format_t *f);
-int pcm_format_convert(pcm_format_t a, void* srca, size_t sizea,
+errno_t pcm_format_mix(void *dst, const void *src, size_t size, const pcm_format_t *f);
+errno_t pcm_format_convert(pcm_format_t a, void* srca, size_t sizea,
     pcm_format_t b, void* srcb, size_t *sizeb);