From d884af2b9992f12e98a3e8548aff76b232b5bfb3 Mon Sep 17 00:00:00 2001 From: Mohamed Tarek Date: Mon, 5 Jul 2010 22:33:37 +0000 Subject: Partial conversion of the wmapro decoder to fixed point arithmetic. Currently inverse quantization & rescaling, imdct and windowing are all in fixed point. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27302 a1c6a512-1295-4272-9138-f99709370657 --- apps/codecs/libwmapro/wmapro_math.h | 46 +++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 apps/codecs/libwmapro/wmapro_math.h (limited to 'apps/codecs/libwmapro/wmapro_math.h') diff --git a/apps/codecs/libwmapro/wmapro_math.h b/apps/codecs/libwmapro/wmapro_math.h new file mode 100644 index 0000000000..83fbb40a66 --- /dev/null +++ b/apps/codecs/libwmapro/wmapro_math.h @@ -0,0 +1,46 @@ +#include +#include "types.h" + +#define fixtof16(x) (float)((float)(x) / (float)(1 << 16)) +#define ftofix16(x) ((int32_t)((x) * (float)(1 << 16) + ((x) < 0 ? -0.5:0.5))) + +static inline FIXED fixmulshift(FIXED x, FIXED y, int shamt) +{ + int64_t temp; + temp = x; + temp *= y; + + temp >>= shamt; + + return (int32_t)temp; +} + + +static inline void vector_fixmul_window(FIXED *dst, const FIXED *src0, + const FIXED *src1, const FIXED *win, + FIXED add_bias, int len) +{ + int i, j; + dst += len; + win += len; + src0+= len; + for(i=-len, j=len-1; i<0; i++, j--) { + FIXED s0 = src0[i]; + FIXED s1 = src1[j]; + FIXED wi = win[i]; + FIXED wj = win[j]; + dst[i] = fixmulshift(s0,-1*wj,31) - fixmulshift(s1,-1*wi,31) + (add_bias<<16); + dst[j] = fixmulshift(s0,-1*wi,31) + fixmulshift(s1,-1*wj,31) + (add_bias<<16); + } + +} + +static inline void vector_fixmul_scalar(FIXED *dst, const FIXED *src, FIXED mul, + int len) +{ + int i; + for(i=0; i