From 991f3de1bb696a55f7604e4b7d53492299fe44b5 Mon Sep 17 00:00:00 2001
From: Justin Ruggles <justin.ruggles@gmail.com>
Date: Fri, 25 Mar 2011 17:12:26 -0400
Subject: ac3enc: Add codec-specific options for writing AC-3 metadata.

---
 libavcodec/ac3.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'libavcodec/ac3.h')

diff --git a/libavcodec/ac3.h b/libavcodec/ac3.h
index e653b2e95d..133c5b9a78 100644
--- a/libavcodec/ac3.h
+++ b/libavcodec/ac3.h
@@ -48,6 +48,17 @@
 #define EXP_D25   2
 #define EXP_D45   3
 
+/* pre-defined gain values */
+#define LEVEL_PLUS_3DB          1.4142135623730950
+#define LEVEL_PLUS_1POINT5DB    1.1892071150027209
+#define LEVEL_MINUS_1POINT5DB   0.8408964152537145
+#define LEVEL_MINUS_3DB         0.7071067811865476
+#define LEVEL_MINUS_4POINT5DB   0.5946035575013605
+#define LEVEL_MINUS_6DB         0.5000000000000000
+#define LEVEL_MINUS_9DB         0.3535533905932738
+#define LEVEL_ZERO              0.0000000000000000
+#define LEVEL_ONE               1.0000000000000000
+
 /** Delta bit allocation strategy */
 typedef enum {
     DBA_REUSE = 0,
-- 
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