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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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dsp/core/q.h Normal file
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#ifndef COSMOPOLITAN_DSP_CORE_Q_H_
#define COSMOPOLITAN_DSP_CORE_Q_H_
#include "libc/limits.h"
#include "libc/macros.h"
#include "libc/math.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
/**
* @fileoverview Fixed point arithmetic macros.
* @see en.wikipedia.org/wiki/Q_(number_format)
*/
#define F2Q(Q, I) MIN((1 << Q) - 1, roundf((I) * (1.f * ((1 << Q) - 1))))
#define Q2F(Q, I) ((I) * (1.f / ((1 << Q) - 1)))
#define QRS(Q, X) (((X) + (1 << (Q - 1))) >> Q)
#define LQRS(Q, X) (((X) + (1L << (Q - 1))) >> Q)
double DifferSumSq(const double[static 6], double, double);
double DifferSumSq8(const double[static 8], double, double);
long GetIntegerCoefficients(long[static 6], const double[static 6], long, long,
long);
long GetIntegerCoefficients8(long[static 8], const double[static 8], long, long,
long);
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_DSP_CORE_Q_H_ */