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-rw-r--r--libavcodec/ac3.h11
1 files changed, 11 insertions, 0 deletions
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,