/usr/include/mpc/mpcmath.h is in libmpcdec-dev 2:0.1~r459-4.1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 | /*
* Musepack audio compression
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <math.h>
#include <mpc/mpc_types.h>
typedef union mpc_floatint
{
float f;
mpc_int32_t n;
} mpc_floatint;
typedef union mpc_doubleint
{
double d;
mpc_int32_t n[2];
} mpc_doubleint;
static mpc_inline mpc_int32_t mpc_lrintf(float fVal)
{
mpc_floatint tmp;
tmp.f = fVal + 0x00FF8000;
return tmp.n - 0x4B7F8000;
}
#define mpc_round32 mpc_lrintf
#define mpc_nearbyintf mpc_lrintf
#ifndef M_PI
# define M_PI 3.1415926535897932384626433832795029 // 4*atan(1)
# define M_PIl 3.1415926535897932384626433832795029L
# define M_LN2 0.6931471805599453094172321214581766 // ln(2)
# define M_LN2l 0.6931471805599453094172321214581766L
# define M_LN10 2.3025850929940456840179914546843642 // ln 10 */
# define M_LN10l 2.3025850929940456840179914546843642L
#endif
// fast but maybe more inaccurate, use if you need speed
#if defined(__GNUC__) && !defined(__APPLE__)
# define SIN(x) sinf ((float)(x))
# define COS(x) cosf ((float)(x))
# define ATAN2(x,y) atan2f ((float)(x), (float)(y))
# define SQRT(x) sqrtf ((float)(x))
# define LOG(x) logf ((float)(x))
# define LOG10(x) log10f ((float)(x))
# define POW(x,y) expf (logf(x) * (y))
# define POW10(x) expf (M_LN10 * (x))
# define FLOOR(x) floorf ((float)(x))
# define IFLOOR(x) (int) floorf ((float)(x))
# define FABS(x) fabsf ((float)(x))
#else
# define SIN(x) (float) sin (x)
# define COS(x) (float) cos (x)
# define ATAN2(x,y) (float) atan2 (x, y)
# define SQRT(x) (float) sqrt (x)
# define LOG(x) (float) log (x)
# define LOG10(x) (float) log10 (x)
# define POW(x,y) (float) pow (x,y)
# define POW10(x) (float) pow (10., (x))
# define FLOOR(x) (float) floor (x)
# define IFLOOR(x) (int) floor (x)
# define FABS(x) (float) fabs (x)
#endif
#define SQRTF(x) SQRT (x)
#ifdef FAST_MATH
# define TABSTEP 64
# define COSF(x) my_cos ((float)(x))
# define ATAN2F(x,y) my_atan2 ((float)(x), (float)(y))
# define IFLOORF(x) my_ifloor ((float)(x))
void Init_FastMath ( void );
extern const float tabatan2 [] [2];
extern const float tabcos [] [2];
extern const float tabsqrt_ex [];
extern const float tabsqrt_m [] [2];
static mpc_inline float my_atan2 ( float x, float y )
{
float t, ret; int i; mpc_floatint mx, my;
mx.f = x;
my.f = y;
if ( (mx.n & 0x7FFFFFFF) < (my.n & 0x7FFFFFFF) ) {
i = mpc_round32 (t = TABSTEP * (mx.f / my.f));
ret = tabatan2 [1*TABSTEP+i][0] + tabatan2 [1*TABSTEP+i][1] * (t-i);
if ( my.n < 0 )
ret = (float)(ret - M_PI);
}
else if ( mx.n < 0 ) {
i = mpc_round32 (t = TABSTEP * (my.f / mx.f));
ret = - M_PI/2 - tabatan2 [1*TABSTEP+i][0] + tabatan2 [1*TABSTEP+i][1] * (i-t);
}
else if ( mx.n > 0 ) {
i = mpc_round32 (t = TABSTEP * (my.f / mx.f));
ret = + M_PI/2 - tabatan2 [1*TABSTEP+i][0] + tabatan2 [1*TABSTEP+i][1] * (i-t);
}
else {
ret = 0.;
}
return ret;
}
static mpc_inline float my_cos ( float x )
{
float t, ret; int i;
i = mpc_round32 (t = TABSTEP * x);
ret = tabcos [13*TABSTEP+i][0] + tabcos [13*TABSTEP+i][1] * (t-i);
return ret;
}
static mpc_inline int my_ifloor ( float x )
{
mpc_floatint mx;
mx.f = (float) (x + (0x0C00000L + 0.500000001));
return mx.n - 1262485505;
}
static mpc_inline float my_sqrt ( float x )
{
float ret; int i, ex; mpc_floatint mx;
mx.f = x;
ex = mx.n >> 23; // get the exponent
mx.n = (mx.n & 0x7FFFFF) | 0x42800000; // delete the exponent
i = mpc_round32 (mx.f); // Integer-part of the mantissa (round ????????????)
ret = tabsqrt_m [i-TABSTEP][0] + tabsqrt_m [i-TABSTEP][1] * (mx.f-i); // calculate value
ret *= tabsqrt_ex [ex];
return ret;
}
#else
# define COSF(x) COS (x)
# define ATAN2F(x,y) ATAN2 (x,y)
# define IFLOORF(x) IFLOOR (x)
#endif
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