diff options
| author | Siarhei Siamashka <siarhei.siamashka@nokia.com> | 2008-12-28 03:22:59 +0200 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2008-12-29 12:52:20 +0100 |
| commit | a6cb57cd010c728e97bb92f7ae6bbc12d61b66c8 (patch) | |
| tree | 02070d99b40713c93c7f3c7cff4e20a3deb07074 /sbc/sbc_math.h | |
| parent | 635e9348a95ee44b208acfb9712ea18f5a10be68 (diff) | |
New SBC analysis filter function to replace current broken code
This code is heavily based on the patch submitted by Jaska Uimonen.
Additional changes include preserving extra bits in the output of
filter function for better precision, support for both 16-bit and
32-bit fixed point implementation. Sign of some table values was
changed in order to preserve a regular code structure and have
multiply-accumulate oparations only. No additional optimizations
were applied as this code is intended to be some kind of "reference"
implementation. Platform specific optimizations may require
different tricks and can be branched off from this implementation.
Some extra information about this code can be found in linux-bluetooth
mailing list archive for December 2008.
Diffstat (limited to 'sbc/sbc_math.h')
| -rw-r--r-- | sbc/sbc_math.h | 14 |
1 files changed, 2 insertions, 12 deletions
diff --git a/sbc/sbc_math.h b/sbc/sbc_math.h index b3d87a62..1503d75c 100644 --- a/sbc/sbc_math.h +++ b/sbc/sbc_math.h @@ -29,31 +29,21 @@ #define ASR(val, bits) ((-2 >> 1 == -1) ? \ ((int32_t)(val)) >> (bits) : ((int32_t) (val)) / (1 << (bits))) -#define SCALE_PROTO4_TBL 15 -#define SCALE_ANA4_TBL 17 -#define SCALE_PROTO8_TBL 16 -#define SCALE_ANA8_TBL 17 +#define SCALE_OUT_BITS 15 + #define SCALE_SPROTO4_TBL 12 #define SCALE_SPROTO8_TBL 14 #define SCALE_NPROTO4_TBL 11 #define SCALE_NPROTO8_TBL 11 -#define SCALE4_STAGE1_BITS 15 -#define SCALE4_STAGE2_BITS 16 #define SCALE4_STAGED1_BITS 15 #define SCALE4_STAGED2_BITS 16 -#define SCALE8_STAGE1_BITS 15 -#define SCALE8_STAGE2_BITS 15 #define SCALE8_STAGED1_BITS 15 #define SCALE8_STAGED2_BITS 16 typedef int32_t sbc_fixed_t; -#define SCALE4_STAGE1(src) ASR(src, SCALE4_STAGE1_BITS) -#define SCALE4_STAGE2(src) ASR(src, SCALE4_STAGE2_BITS) #define SCALE4_STAGED1(src) ASR(src, SCALE4_STAGED1_BITS) #define SCALE4_STAGED2(src) ASR(src, SCALE4_STAGED2_BITS) -#define SCALE8_STAGE1(src) ASR(src, SCALE8_STAGE1_BITS) -#define SCALE8_STAGE2(src) ASR(src, SCALE8_STAGE2_BITS) #define SCALE8_STAGED1(src) ASR(src, SCALE8_STAGED1_BITS) #define SCALE8_STAGED2(src) ASR(src, SCALE8_STAGED2_BITS) |