28 lines
954 B
C
28 lines
954 B
C
#ifndef COSMOPOLITAN_DSP_CORE_Q_H_
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#define COSMOPOLITAN_DSP_CORE_Q_H_
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#include "libc/limits.h"
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#include "libc/macros.h"
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#include "libc/math.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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/**
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* @fileoverview Fixed point arithmetic macros.
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* @see en.wikipedia.org/wiki/Q_(number_format)
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*/
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#define F2Q(Q, I) MIN((1 << Q) - 1, roundf((I) * (1.f * ((1 << Q) - 1))))
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#define Q2F(Q, I) ((I) * (1.f / ((1 << Q) - 1)))
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#define QRS(Q, X) (((X) + (1 << (Q - 1))) >> Q)
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#define LQRS(Q, X) (((X) + (1L << (Q - 1))) >> Q)
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double DifferSumSq(const double[static 6], double, double);
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double DifferSumSq8(const double[static 8], double, double);
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long GetIntegerCoefficients(long[static 6], const double[static 6], long, long,
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long);
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long GetIntegerCoefficients8(long[static 8], const double[static 8], long, long,
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long);
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_DSP_CORE_Q_H_ */
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