mirror of https://github.com/mpv-player/mpv
239 lines
5.7 KiB
C
239 lines
5.7 KiB
C
/********************************************************************
|
|
* *
|
|
* 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 1994-2002 *
|
|
* 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"
|
|
|
|
#include "asm_arm.h"
|
|
|
|
#ifndef _V_WIDE_MATH
|
|
#define _V_WIDE_MATH
|
|
|
|
#ifndef _LOW_ACCURACY_
|
|
/* 64 bit multiply */
|
|
|
|
#include <sys/types.h>
|
|
#include "config.h"
|
|
|
|
#ifndef WORDS_BIGENDIAN
|
|
union magic {
|
|
struct {
|
|
ogg_int32_t lo;
|
|
ogg_int32_t hi;
|
|
} halves;
|
|
ogg_int64_t whole;
|
|
};
|
|
#else
|
|
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
|
|
|
|
static inline ogg_int32_t VFLOAT_MULT(ogg_int32_t a,ogg_int32_t ap,
|
|
ogg_int32_t b,ogg_int32_t bp,
|
|
ogg_int32_t *p){
|
|
if(a && b){
|
|
#ifndef _LOW_ACCURACY_
|
|
*p=ap+bp+32;
|
|
return MULT32(a,b);
|
|
#else
|
|
*p=ap+bp+31;
|
|
return (a>>15)*(b>>16);
|
|
#endif
|
|
}else
|
|
return 0;
|
|
}
|
|
|
|
static inline ogg_int32_t VFLOAT_MULTI(ogg_int32_t a,ogg_int32_t ap,
|
|
ogg_int32_t i,
|
|
ogg_int32_t *p){
|
|
|
|
int ip=_ilog(abs(i))-31;
|
|
return VFLOAT_MULT(a,ap,i<<-ip,ip,p);
|
|
}
|
|
|
|
static inline ogg_int32_t VFLOAT_ADD(ogg_int32_t a,ogg_int32_t ap,
|
|
ogg_int32_t b,ogg_int32_t bp,
|
|
ogg_int32_t *p){
|
|
|
|
if(!a){
|
|
*p=bp;
|
|
return b;
|
|
}else if(!b){
|
|
*p=ap;
|
|
return a;
|
|
}
|
|
|
|
/* yes, this can leak a bit. */
|
|
if(ap>bp){
|
|
int shift=ap-bp+1;
|
|
*p=ap+1;
|
|
a>>=1;
|
|
if(shift<32){
|
|
b=(b+(1<<(shift-1)))>>shift;
|
|
}else{
|
|
b=0;
|
|
}
|
|
}else{
|
|
int shift=bp-ap+1;
|
|
*p=bp+1;
|
|
b>>=1;
|
|
if(shift<32){
|
|
a=(a+(1<<(shift-1)))>>shift;
|
|
}else{
|
|
a=0;
|
|
}
|
|
}
|
|
|
|
a+=b;
|
|
if((a&0xc0000000)==0xc0000000 ||
|
|
(a&0xc0000000)==0){
|
|
a<<=1;
|
|
(*p)--;
|
|
}
|
|
return(a);
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|