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| author | Justin Ruggles <justin.ruggles@gmail.com> | 2007-07-14 16:06:14 +0000 |
|---|---|---|
| committer | Justin Ruggles <justin.ruggles@gmail.com> | 2007-07-14 16:06:14 +0000 |
| commit | 967d397a6c6e9d5c080e199684127cc5d7216992 (patch) | |
| tree | 50e8e940596202e8aa589de3d89b350e3f6cec1f | |
| parent | afb46fc092d68e1b6ac5ba438d075f405e453b22 (diff) | |
| download | ffmpeg-967d397a6c6e9d5c080e199684127cc5d7216992.tar.gz | |
AC-3 decoder, soc revision 402, Jul 14 13:45:14 2007 UTC by jbr
merge ac3_decoder.h into ac3_decoder.c
Originally committed as revision 9673 to svn://svn.ffmpeg.org/ffmpeg/trunk
| -rw-r--r-- | libavcodec/ac3dec.c | 44 |
1 files changed, 43 insertions, 1 deletions
diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c index 1b3d6059ef..c8a8a92c3f 100644 --- a/libavcodec/ac3dec.c +++ b/libavcodec/ac3dec.c @@ -40,10 +40,52 @@ #include "avcodec.h" #include "ac3tab.h" -#include "ac3_decoder.h" #include "bitstream.h" #include "dsputil.h" +static const int nfchans_tbl[8] = { 2, 1, 2, 3, 3, 4, 4, 5 }; + +/* table for exponent to scale_factor mapping + * scale_factor[i] = 2 ^ -(i + 15) + */ +static float scale_factors[25]; + +static int16_t psdtab[25]; + +static int8_t exp_1[128]; +static int8_t exp_2[128]; +static int8_t exp_3[128]; + +static int16_t l3_quantizers_1[32]; +static int16_t l3_quantizers_2[32]; +static int16_t l3_quantizers_3[32]; + +static int16_t l5_quantizers_1[128]; +static int16_t l5_quantizers_2[128]; +static int16_t l5_quantizers_3[128]; + +static int16_t l7_quantizers[7]; + +static int16_t l11_quantizers_1[128]; +static int16_t l11_quantizers_2[128]; + +static int16_t l15_quantizers[15]; + +static const uint8_t qntztab[16] = { 0, 5, 7, 3, 7, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 16 }; + +/* Adjustmens in dB gain */ +#define LEVEL_MINUS_3DB 0.7071067811865476 +#define LEVEL_MINUS_4POINT5DB 0.5946035575013605 +#define LEVEL_MINUS_6DB 0.5000000000000000 +#define LEVEL_PLUS_3DB 1.4142135623730951 +#define LEVEL_PLUS_6DB 2.0000000000000000 +#define LEVEL_ZERO 0.0000000000000000 + +static const float clevs[4] = { LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, + LEVEL_MINUS_6DB, LEVEL_MINUS_4POINT5DB }; + +static const float slevs[4] = { LEVEL_MINUS_3DB, LEVEL_MINUS_6DB, LEVEL_ZERO, LEVEL_MINUS_6DB }; + #define N 512 /* constant for IMDCT Block size */ #define MAX_CHANNELS 6 |