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| author | Ganesh Ajjanagadde <gajjanagadde@gmail.com> | 2015-12-15 23:27:23 -0500 |
|---|---|---|
| committer | Ganesh Ajjanagadde <gajjanagadde@gmail.com> | 2015-12-19 09:32:53 -0800 |
| commit | def3c83e1b85cc17cade257cbf3b1fb84e61f788 (patch) | |
| tree | 6135823380c31ccaddc660ed50d71e9be1434e60 /libavcodec/aacsbr.h | |
| parent | ce10f572c12b0d172c72d31d8c979afce602bf0c (diff) | |
lavc/aacsbr: sbr_dequant optimization
This uses ff_exp2fi to get a speedup (~ 6x).
sample benchmark (Haswell, GNU/Linux):
old:
19102 decicycles in sbr_dequant, 1023 runs, 1 skips
19002 decicycles in sbr_dequant, 2045 runs, 3 skips
17638 decicycles in sbr_dequant, 4093 runs, 3 skips
15825 decicycles in sbr_dequant, 8189 runs, 3 skips
16404 decicycles in sbr_dequant, 16379 runs, 5 skips
new:
3063 decicycles in sbr_dequant, 1024 runs, 0 skips
3049 decicycles in sbr_dequant, 2048 runs, 0 skips
2968 decicycles in sbr_dequant, 4096 runs, 0 skips
2818 decicycles in sbr_dequant, 8191 runs, 1 skips
2853 decicycles in sbr_dequant, 16383 runs, 1 skips
Reviewed-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
Diffstat (limited to 'libavcodec/aacsbr.h')
| -rw-r--r-- | libavcodec/aacsbr.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/aacsbr.h b/libavcodec/aacsbr.h index ed1a7f9265..88c4d8a916 100644 --- a/libavcodec/aacsbr.h +++ b/libavcodec/aacsbr.h @@ -34,7 +34,7 @@ #include "sbr.h" #define ENVELOPE_ADJUSTMENT_OFFSET 2 -#define NOISE_FLOOR_OFFSET FIXR(6.0f) +#define NOISE_FLOOR_OFFSET 6 /** * SBR VLC tables |