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xash3d-fwgs/engine/common/soundlib/libmpg/sample.h

49 lines
1.3 KiB
C

/*
sample.h - compact version of famous library mpg123
Copyright (C) 2017 Uncle Mike
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
*/
#ifndef SAMPLE_H
#define SAMPLE_H
// define the accurate rounding function.
#ifdef IEEE_FLOAT
// rhis function is only available for IEEE754 single-precision values
// rhis is nearly identical to proper rounding, just -+0.5 is rounded to 0
static _inline int16_t ftoi16( float x )
{
union
{
float f;
int32_t i;
} u_fi;
u_fi.f = x + 12582912.0f; // Magic Number: 2^23 + 2^22
return (int16_t)u_fi.i;
}
#define REAL_TO_SHORT_ACCURATE( x ) ftoi16(x)
#else
// the "proper" rounding, plain C, a bit slow.
#define REAL_TO_SHORT_ACCURATE( x ) (short)((x) > 0.0f ? (x) + 0.5f : (x) - 0.5f)
#endif
// now define the normal rounding.
#ifdef ACCURATE_ROUNDING
#define REAL_TO_SHORT( x ) REAL_TO_SHORT_ACCURATE( x )
#else
#define REAL_TO_SHORT( x ) (short)( x )
#endif
#endif//SAMPLE_H