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/********************************************************************
* *
* THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
* *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
* *
* THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2003 *
* BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
* *
********************************************************************
function: miscellaneous math and prototypes
********************************************************************/
#ifndef _V_RANDOM_H_
#define _V_RANDOM_H_
#include "ivorbiscodec.h"
#include "os_types.h"
/*#define _VDBG_GRAPHFILE "_0.m"*/
#ifdef _VDBG_GRAPHFILE
extern void *_VDBG_malloc(void *ptr,long bytes,char *file,long line);
extern void _VDBG_free(void *ptr,char *file,long line);
#undef _ogg_malloc
#undef _ogg_calloc
#undef _ogg_realloc
#undef _ogg_free
#define _ogg_malloc(x) _VDBG_malloc(NULL,(x),__FILE__,__LINE__)
#define _ogg_calloc(x,y) _VDBG_malloc(NULL,(x)*(y),__FILE__,__LINE__)
#define _ogg_realloc(x,y) _VDBG_malloc((x),(y),__FILE__,__LINE__)
#define _ogg_free(x) _VDBG_free((x),__FILE__,__LINE__)
#endif
#include "asm_arm.h"
#ifndef _V_WIDE_MATH
#define _V_WIDE_MATH
#ifndef _LOW_ACCURACY_
/* 64 bit multiply */
#include <sys/types.h>
#if BYTE_ORDER==LITTLE_ENDIAN
union magic {
struct {
ogg_int32_t lo;
ogg_int32_t hi;
} halves;
ogg_int64_t whole;
};
#endif
#if BYTE_ORDER==BIG_ENDIAN
union magic {
struct {
ogg_int32_t hi;
ogg_int32_t lo;
} halves;
ogg_int64_t whole;
};
#endif
static inline ogg_int32_t MULT32(ogg_int32_t x, ogg_int32_t y) {
union magic magic;
magic.whole = (ogg_int64_t)x * y;
return magic.halves.hi;
}
static inline ogg_int32_t MULT31(ogg_int32_t x, ogg_int32_t y) {
return MULT32(x,y)<<1;
}
static inline ogg_int32_t MULT31_SHIFT15(ogg_int32_t x, ogg_int32_t y) {
union magic magic;
magic.whole = (ogg_int64_t)x * y;
return ((ogg_uint32_t)(magic.halves.lo)>>15) | ((magic.halves.hi)<<17);
}
#else
/* 32 bit multiply, more portable but less accurate */
/*
* Note: Precision is biased towards the first argument therefore ordering
* is important. Shift values were chosen for the best sound quality after
* many listening tests.
*/
/*
* For MULT32 and MULT31: The second argument is always a lookup table
* value already preshifted from 31 to 8 bits. We therefore take the
* opportunity to save on text space and use unsigned char for those
* tables in this case.
*/
static inline ogg_int32_t MULT32(ogg_int32_t x, ogg_int32_t y) {
return (x >> 9) * y; /* y preshifted >>23 */
}
static inline ogg_int32_t MULT31(ogg_int32_t x, ogg_int32_t y) {
return (x >> 8) * y; /* y preshifted >>23 */
}
static inline ogg_int32_t MULT31_SHIFT15(ogg_int32_t x, ogg_int32_t y) {
return (x >> 6) * y; /* y preshifted >>9 */
}
#endif
/*
* This should be used as a memory barrier, forcing all cached values in
* registers to wr writen back to memory. Might or might not be beneficial
* depending on the architecture and compiler.
*/
#define MB()
/*
* The XPROD functions are meant to optimize the cross products found all
* over the place in mdct.c by forcing memory operation ordering to avoid
* unnecessary register reloads as soon as memory is being written to.
* However this is only beneficial on CPUs with a sane number of general
* purpose registers which exclude the Intel x86. On Intel, better let the
* compiler actually reload registers directly from original memory by using
* macros.
*/
#ifdef __i386__
#define XPROD32(_a, _b, _t, _v, _x, _y) \
{ *(_x)=MULT32(_a,_t)+MULT32(_b,_v); \
*(_y)=MULT32(_b,_t)-MULT32(_a,_v); }
#define XPROD31(_a, _b, _t, _v, _x, _y) \
{ *(_x)=MULT31(_a,_t)+MULT31(_b,_v); \
*(_y)=MULT31(_b,_t)-MULT31(_a,_v); }
#define XNPROD31(_a, _b, _t, _v, _x, _y) \
{ *(_x)=MULT31(_a,_t)-MULT31(_b,_v); \
*(_y)=MULT31(_b,_t)+MULT31(_a,_v); }
#else
static inline void XPROD32(ogg_int32_t a, ogg_int32_t b,
ogg_int32_t t, ogg_int32_t v,
ogg_int32_t *x, ogg_int32_t *y)
{
*x = MULT32(a, t) + MULT32(b, v);
*y = MULT32(b, t) - MULT32(a, v);
}
static inline void XPROD31(ogg_int32_t a, ogg_int32_t b,
ogg_int32_t t, ogg_int32_t v,
ogg_int32_t *x, ogg_int32_t *y)
{
*x = MULT31(a, t) + MULT31(b, v);
*y = MULT31(b, t) - MULT31(a, v);
}
static inline void XNPROD31(ogg_int32_t a, ogg_int32_t b,
ogg_int32_t t, ogg_int32_t v,
ogg_int32_t *x, ogg_int32_t *y)
{
*x = MULT31(a, t) - MULT31(b, v);
*y = MULT31(b, t) + MULT31(a, v);
}
#endif
#endif
#ifndef _V_CLIP_MATH
#define _V_CLIP_MATH
static inline ogg_int32_t CLIP_TO_15(ogg_int32_t x) {
int ret=x;
ret-= ((x<=32767)-1)&(x-32767);
ret-= ((x>=-32768)-1)&(x+32768);
return(ret);
}
#endif
#endif
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