diff options
Diffstat (limited to 'apps/codecs/libatrac/fixp_math.h')
-rw-r--r-- | apps/codecs/libatrac/fixp_math.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/apps/codecs/libatrac/fixp_math.h b/apps/codecs/libatrac/fixp_math.h new file mode 100644 index 0000000000..5bfc2c5703 --- /dev/null +++ b/apps/codecs/libatrac/fixp_math.h | |||
@@ -0,0 +1,14 @@ | |||
1 | #include <stdlib.h> | ||
2 | |||
3 | /* Macros for converting between various fixed-point representations and floating point. */ | ||
4 | #define ONE_16 (1L << 16) | ||
5 | #define fixtof64(x) (float)((float)(x) / (float)(1 << 16)) //does not work on int64_t! | ||
6 | #define ftofix32(x) ((int32_t)((x) * (float)(1 << 16) + ((x) < 0 ? -0.5 : 0.5))) | ||
7 | #define ftofix31(x) ((int32_t)((x) * (float)(1 << 31) + ((x) < 0 ? -0.5 : 0.5))) | ||
8 | #define fix31tof64(x) (float)((float)(x) / (float)(1 << 31)) | ||
9 | |||
10 | /* Fixed point math routines for use in atrac3.c */ | ||
11 | inline int32_t fixdiv16(int32_t x, int32_t y); | ||
12 | inline int32_t fixmul16(int32_t x, int32_t y); | ||
13 | inline int32_t fixmul31(int32_t x, int32_t y); | ||
14 | inline int32_t fastSqrt(int32_t n); | ||