diff --git a/include/audio_math.h b/include/audio_math.h
new file mode 100644
index 0000000000..4b9ca474ac
--- /dev/null
+++ b/include/audio_math.h
@@ -0,0 +1,11 @@
+/******************************************************************************
+ * audio_math.h : PCM and DCT
+ * (c)1999 VideoLAN
+ ******************************************************************************/
+
+/******************************************************************************
+ * Prototypes
+ ******************************************************************************/
+void     DCT32(float *x, adec_bank_t *b);
+void     PCM(adec_bank_t *b, s16 **pcm, int jump);
+