diff options
Diffstat (limited to 'libavcodec/ac3dec.c')
| -rw-r--r-- | libavcodec/ac3dec.c | 26 |
1 files changed, 16 insertions, 10 deletions
diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c index e7fcd87728..74f34f8e14 100644 --- a/libavcodec/ac3dec.c +++ b/libavcodec/ac3dec.c @@ -72,6 +72,9 @@ static const uint8_t quantization_tab[16] = { static float dynamic_range_tab[256]; /** Adjustments in dB gain */ +#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 @@ -79,12 +82,15 @@ static float dynamic_range_tab[256]; #define LEVEL_ZERO 0.0000000000000000 #define LEVEL_ONE 1.0000000000000000 -static const float gain_levels[6] = { - LEVEL_ZERO, +static const float gain_levels[9] = { + LEVEL_PLUS_3DB, + LEVEL_PLUS_1POINT5DB, LEVEL_ONE, + LEVEL_MINUS_1POINT5DB, LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB, + LEVEL_ZERO, LEVEL_MINUS_9DB }; @@ -93,14 +99,14 @@ static const float gain_levels[6] = { * reference: Section 7.8.2 Downmixing Into Two Channels */ static const uint8_t ac3_default_coeffs[8][5][2] = { - { { 1, 0 }, { 0, 1 }, }, - { { 2, 2 }, }, - { { 1, 0 }, { 0, 1 }, }, - { { 1, 0 }, { 3, 3 }, { 0, 1 }, }, - { { 1, 0 }, { 0, 1 }, { 4, 4 }, }, - { { 1, 0 }, { 3, 3 }, { 0, 1 }, { 5, 5 }, }, - { { 1, 0 }, { 0, 1 }, { 4, 0 }, { 0, 4 }, }, - { { 1, 0 }, { 3, 3 }, { 0, 1 }, { 4, 0 }, { 0, 4 }, }, + { { 2, 7 }, { 7, 2 }, }, + { { 4, 4 }, }, + { { 2, 7 }, { 7, 2 }, }, + { { 2, 7 }, { 5, 5 }, { 7, 2 }, }, + { { 2, 7 }, { 7, 2 }, { 6, 6 }, }, + { { 2, 7 }, { 5, 5 }, { 7, 2 }, { 8, 8 }, }, + { { 2, 7 }, { 7, 2 }, { 6, 7 }, { 7, 6 }, }, + { { 2, 7 }, { 5, 5 }, { 7, 2 }, { 6, 7 }, { 7, 6 }, }, }; /* override ac3.h to include coupling channel */ |