72 lines
2.3 KiB
C
72 lines
2.3 KiB
C
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/* Copyright (C) 2002 Jean-Marc Valin */
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/**
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@file math_approx.h
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@brief Various math approximation functions for Speex
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*/
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of the Xiph.org Foundation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef MATH_APPROX_H
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#define MATH_APPROX_H
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#include "misc.h"
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#ifdef FIXED_POINT
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spx_word16_t spx_cos(spx_word16_t x);
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spx_word16_t spx_sqrt(spx_word32_t x);
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float spx_sqrtf(float arg);
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spx_word16_t spx_acos(spx_word16_t x);
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float spx_floor(float x);
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float spx_exp(float x);
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extern const float exp_lookup_int[];
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/** Returns: Math.exp((idx-10) / 8.0) Range:0-32*/
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static inline float spx_exp_lookup(int xf){
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return exp_lookup_int[xf];
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}
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//Placeholders:
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float pow(float a,float b);
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float log(float l);
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float fabs(float l);
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float sin(float l);
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//float floor(float l);
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#define floor spx_floor
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#define exp spx_exp
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#define sqrt spx_sqrt
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#define acos spx_acos
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#define cos spx_cos
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#else
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#define spx_sqrt sqrt
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#define spx_acos acos
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#endif
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#endif
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