X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fac3.h;h=747f2f561dc73a11ad5413f42d9c63dc0b2a805b;hb=3564dfd535743ad586c10800c7f931e5bf3cbde7;hp=ff362490456fd9759d6cf4c5a2e0a96fcf0352a4;hpb=ad317c94c5fad00f97881263647e316344f0a81e;p=ffmpeg

diff --git a/libavcodec/ac3.h b/libavcodec/ac3.h
index ff362490456..747f2f561dc 100644
--- a/libavcodec/ac3.h
+++ b/libavcodec/ac3.h
@@ -97,13 +97,13 @@ typedef float                   SHORTFLOAT;
 
 #endif /* USE_FIXED */
 
-#define AC3_LEVEL(x)            ROUND15((x) * FIXR15(0.7071067811865476))
+#define AC3_LEVEL(x)            ROUND15((x) * FIXR15(M_SQRT1_2))
 
 /* pre-defined gain values */
-#define LEVEL_PLUS_3DB          1.4142135623730950
+#define LEVEL_PLUS_3DB          M_SQRT2
 #define LEVEL_PLUS_1POINT5DB    1.1892071150027209
 #define LEVEL_MINUS_1POINT5DB   0.8408964152537145
-#define LEVEL_MINUS_3DB         0.7071067811865476
+#define LEVEL_MINUS_3DB         M_SQRT1_2
 #define LEVEL_MINUS_4POINT5DB   0.5946035575013605
 #define LEVEL_MINUS_6DB         0.5000000000000000
 #define LEVEL_MINUS_9DB         0.3535533905932738