author | unc0rr |
Thu, 23 Jun 2011 21:19:43 +0400 | |
changeset 5294 | 67278f1cba2c |
parent 5170 | f7e49eff3708 |
permissions | -rw-r--r-- |
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/******************************************************************** |
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* * |
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* THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. * |
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* * |
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * |
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * |
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * |
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* * |
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* THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 * |
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* BY THE Xiph.Org FOUNDATION http://www.xiph.org/ * |
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* * |
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******************************************************************** |
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function: miscellaneous math and prototypes |
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********************************************************************/ |
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#ifndef _V_RANDOM_H_ |
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#define _V_RANDOM_H_ |
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#include "ivorbiscodec.h" |
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#include "os.h" |
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#include "asm_arm.h" |
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#include <stdlib.h> /* for abs() */ |
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#ifndef _V_WIDE_MATH |
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#define _V_WIDE_MATH |
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#ifndef _LOW_ACCURACY_ |
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/* 64 bit multiply */ |
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#if !(defined WIN32 && defined WINCE) |
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#include <sys/types.h> |
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#endif |
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#if BYTE_ORDER==LITTLE_ENDIAN |
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union magic { |
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struct { |
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ogg_int32_t lo; |
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ogg_int32_t hi; |
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} halves; |
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ogg_int64_t whole; |
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}; |
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#endif |
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#if BYTE_ORDER==BIG_ENDIAN |
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union magic { |
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struct { |
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ogg_int32_t hi; |
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ogg_int32_t lo; |
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} halves; |
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ogg_int64_t whole; |
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}; |
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#endif |
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STIN ogg_int32_t MULT32(ogg_int32_t x, ogg_int32_t y) { |
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union magic magic; |
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magic.whole = (ogg_int64_t)x * y; |
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return magic.halves.hi; |
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} |
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STIN ogg_int32_t MULT31(ogg_int32_t x, ogg_int32_t y) { |
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return MULT32(x,y)<<1; |
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} |
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STIN ogg_int32_t MULT31_SHIFT15(ogg_int32_t x, ogg_int32_t y) { |
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union magic magic; |
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magic.whole = (ogg_int64_t)x * y; |
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return ((ogg_uint32_t)(magic.halves.lo)>>15) | ((magic.halves.hi)<<17); |
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} |
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#else |
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/* 32 bit multiply, more portable but less accurate */ |
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/* |
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* Note: Precision is biased towards the first argument therefore ordering |
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* is important. Shift values were chosen for the best sound quality after |
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* many listening tests. |
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*/ |
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/* |
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* For MULT32 and MULT31: The second argument is always a lookup table |
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* value already preshifted from 31 to 8 bits. We therefore take the |
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* opportunity to save on text space and use unsigned char for those |
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* tables in this case. |
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*/ |
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STIN ogg_int32_t MULT32(ogg_int32_t x, ogg_int32_t y) { |
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return (x >> 9) * y; /* y preshifted >>23 */ |
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} |
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STIN ogg_int32_t MULT31(ogg_int32_t x, ogg_int32_t y) { |
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return (x >> 8) * y; /* y preshifted >>23 */ |
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} |
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STIN ogg_int32_t MULT31_SHIFT15(ogg_int32_t x, ogg_int32_t y) { |
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return (x >> 6) * y; /* y preshifted >>9 */ |
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} |
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#endif |
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/* |
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* This should be used as a memory barrier, forcing all cached values in |
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* registers to wr writen back to memory. Might or might not be beneficial |
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* depending on the architecture and compiler. |
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*/ |
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#define MB() |
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/* |
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* The XPROD functions are meant to optimize the cross products found all |
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* over the place in mdct.c by forcing memory operation ordering to avoid |
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* unnecessary register reloads as soon as memory is being written to. |
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* However this is only beneficial on CPUs with a sane number of general |
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* purpose registers which exclude the Intel x86. On Intel, better let the |
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* compiler actually reload registers directly from original memory by using |
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* macros. |
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*/ |
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#ifdef __i386__ |
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#define XPROD32(_a, _b, _t, _v, _x, _y) \ |
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{ *(_x)=MULT32(_a,_t)+MULT32(_b,_v); \ |
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*(_y)=MULT32(_b,_t)-MULT32(_a,_v); } |
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#define XPROD31(_a, _b, _t, _v, _x, _y) \ |
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{ *(_x)=MULT31(_a,_t)+MULT31(_b,_v); \ |
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*(_y)=MULT31(_b,_t)-MULT31(_a,_v); } |
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#define XNPROD31(_a, _b, _t, _v, _x, _y) \ |
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{ *(_x)=MULT31(_a,_t)-MULT31(_b,_v); \ |
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*(_y)=MULT31(_b,_t)+MULT31(_a,_v); } |
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130 |
|
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#else |
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132 |
|
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STIN void XPROD32(ogg_int32_t a, ogg_int32_t b, |
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ogg_int32_t t, ogg_int32_t v, |
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ogg_int32_t *x, ogg_int32_t *y) |
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{ |
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*x = MULT32(a, t) + MULT32(b, v); |
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*y = MULT32(b, t) - MULT32(a, v); |
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} |
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|
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STIN void XPROD31(ogg_int32_t a, ogg_int32_t b, |
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ogg_int32_t t, ogg_int32_t v, |
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ogg_int32_t *x, ogg_int32_t *y) |
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{ |
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*x = MULT31(a, t) + MULT31(b, v); |
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*y = MULT31(b, t) - MULT31(a, v); |
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} |
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|
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STIN void XNPROD31(ogg_int32_t a, ogg_int32_t b, |
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ogg_int32_t t, ogg_int32_t v, |
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ogg_int32_t *x, ogg_int32_t *y) |
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{ |
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*x = MULT31(a, t) - MULT31(b, v); |
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*y = MULT31(b, t) + MULT31(a, v); |
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} |
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156 |
|
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157 |
#endif |
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158 |
|
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#endif |
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|
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#ifndef _V_CLIP_MATH |
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#define _V_CLIP_MATH |
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163 |
|
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STIN ogg_int32_t CLIP_TO_15(ogg_int32_t x) { |
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int ret=x; |
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ret-= ((x<=32767)-1)&(x-32767); |
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ret-= ((x>=-32768)-1)&(x+32768); |
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return(ret); |
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169 |
} |
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170 |
|
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171 |
#endif |
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172 |
|
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STIN ogg_int32_t VFLOAT_MULT(ogg_int32_t a,ogg_int32_t ap, |
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ogg_int32_t b,ogg_int32_t bp, |
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ogg_int32_t *p){ |
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if(a && b){ |
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177 |
#ifndef _LOW_ACCURACY_ |
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*p=ap+bp+32; |
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return MULT32(a,b); |
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180 |
#else |
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181 |
*p=ap+bp+31; |
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return (a>>15)*(b>>16); |
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183 |
#endif |
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184 |
}else |
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185 |
return 0; |
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186 |
} |
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187 |
|
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188 |
int _ilog(unsigned int); |
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189 |
|
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STIN ogg_int32_t VFLOAT_MULTI(ogg_int32_t a,ogg_int32_t ap, |
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191 |
ogg_int32_t i, |
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ogg_int32_t *p){ |
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193 |
|
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int ip=_ilog(abs(i))-31; |
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return VFLOAT_MULT(a,ap,i<<-ip,ip,p); |
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196 |
} |
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197 |
|
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STIN ogg_int32_t VFLOAT_ADD(ogg_int32_t a,ogg_int32_t ap, |
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ogg_int32_t b,ogg_int32_t bp, |
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200 |
ogg_int32_t *p){ |
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201 |
|
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202 |
if(!a){ |
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203 |
*p=bp; |
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204 |
return b; |
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205 |
}else if(!b){ |
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206 |
*p=ap; |
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207 |
return a; |
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208 |
} |
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209 |
|
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210 |
/* yes, this can leak a bit. */ |
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211 |
if(ap>bp){ |
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int shift=ap-bp+1; |
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*p=ap+1; |
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a>>=1; |
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215 |
if(shift<32){ |
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216 |
b=(b+(1<<(shift-1)))>>shift; |
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217 |
}else{ |
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b=0; |
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219 |
} |
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220 |
}else{ |
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int shift=bp-ap+1; |
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*p=bp+1; |
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b>>=1; |
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224 |
if(shift<32){ |
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225 |
a=(a+(1<<(shift-1)))>>shift; |
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226 |
}else{ |
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227 |
a=0; |
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228 |
} |
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229 |
} |
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230 |
|
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231 |
a+=b; |
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232 |
if((a&0xc0000000)==0xc0000000 || |
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(a&0xc0000000)==0){ |
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234 |
a<<=1; |
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235 |
(*p)--; |
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236 |
} |
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237 |
return(a); |
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238 |
} |
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239 |
|
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240 |
#endif |
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241 |
|
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242 |
|
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243 |
|
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244 |