diff --git a/include/ksmedia.h b/include/ksmedia.h
index 6eb0caa9436..4f36ccc8b1e 100644
--- a/include/ksmedia.h
+++ b/include/ksmedia.h
@@ -26,4 +26,12 @@
 DEFINE_GUID(KSDATAFORMAT_SUBTYPE_PCM, 0x00000001, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71);
 DEFINE_GUID(KSDATAFORMAT_SUBTYPE_IEEE_FLOAT, 0x00000003, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71);
 
+#define KSAUDIO_SPEAKER_DIRECTOUT 0
+#define KSAUDIO_SPEAKER_MONO SPEAKER_FRONT_CENTER
+#define KSAUDIO_SPEAKER_STEREO (SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT)
+#define KSAUDIO_SPEAKER_QUAD (SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT | SPEAKER_BACK_LEFT | SPEAKER_BACK_RIGHT)
+#define KSAUDIO_SPEAKER_SURROUND (SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT | SPEAKER_FRONT_CENTER | SPEAKER_BACK_CENTER)
+#define KSAUDIO_SPEAKER_5POINT1 (SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT | SPEAKER_FRONT_CENTER | SPEAKER_LOWFREQUENCY | SPEAKER_BACK_LEFT | SPEAKER_BACK_RIGHT)
+#define KSAUDIO_SPEAKER_7POINT1 (KSAUDIO_SPEAKER_5POINT1 | SPEAKER_FRONT_LEFT_OF_CENTER | SPEAKER_FRONT_RIGHT_OF_CENTER)
+
 #endif  /* _KSMEDIA_ */