mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-26 18:20:44 +00:00
37 lines
788 B
C
37 lines
788 B
C
|
#ifndef MATHTOOLS_H
|
||
|
|
#define MATHTOOLS_H
|
||
|
|
|
||
|
|
|
||
|
|
#define _double2fixmagic (68719476736.0*1.5)
|
||
|
|
/* 2^36 * 1.5, (52-_shiftamt=36) uses limited precisicion to floor */
|
||
|
|
#define _shiftamt 16
|
||
|
|
/* 16.16 fixed point representation */
|
||
|
|
|
||
|
|
#if BigEndian_
|
||
|
|
#define iexp_ 0
|
||
|
|
#define iman_ 1
|
||
|
|
#else
|
||
|
|
#define iexp_ 1
|
||
|
|
#define iman_ 0
|
||
|
|
#endif /* BigEndian_ */
|
||
|
|
|
||
|
|
/* TODO: this optimization is very efficient: put it again when all works
|
||
|
|
#ifdef HAVE_MMX
|
||
|
|
#define F2I(dbl,i) {double d = dbl + _double2fixmagic; i = ((int*)&d)[iman_] >> _shiftamt;}
|
||
|
|
#else*/
|
||
|
|
#define F2I(dbl,i) i=(int)dbl;
|
||
|
|
/*#endif*/
|
||
|
|
|
||
|
|
#if 0
|
||
|
|
#define SINCOS(f,s,c) \
|
||
|
|
__asm__ __volatile__ ("fsincos" : "=t" (c), "=u" (s) : "0" (f))
|
||
|
|
#else
|
||
|
|
#define SINCOS(f,s,c) {s=sin(f);c=cos(f);}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
extern float sin256[256];
|
||
|
|
extern float cos256[256];
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|