123 lines
3.3 KiB
C
123 lines
3.3 KiB
C
/* Copyright (C) 2002-2008 Jean-Marc Valin */
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/**
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@file mathops.h
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@brief Various math functions
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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 MATHOPS_H
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#define MATHOPS_H
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#include "arch.h"
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#ifndef FIXED_POINT
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#define celt_sqrt sqrt
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#define celt_acos acos
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#define celt_exp exp
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#define celt_cos_norm(x) (cos((.5f*M_PI)*(x)))
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#define celt_atan atan
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#endif
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#ifdef FIXED_POINT
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#include "entcode.h"
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#define C0 3634
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#define C1 21173
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#define C2 -12627
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#define C3 4204
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static inline celt_word32_t celt_sqrt(celt_word32_t x)
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{
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int k;
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//printf ("%d ", x);
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celt_word32_t rt;
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/* ((EC_ILOG(x)-1)>>1) is just the int log4(x) (EC_ILOG returns log2 + 1) */
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k = ((EC_ILOG(x)-1)>>1)-6;
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x = VSHR32(x, (k<<1));
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rt = ADD16(C0, MULT16_16_Q14(x, ADD16(C1, MULT16_16_Q14(x, ADD16(C2, MULT16_16_Q14(x, (C3)))))));
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rt = VSHR32(rt,7-k);
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//printf ("%d\n", rt);
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return rt;
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}
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#define L1 32767
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#define L2 -7651
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#define L3 8277
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#define L4 -626
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static inline celt_word16_t _celt_cos_pi_2(celt_word16_t x)
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{
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celt_word16_t x2;
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x2 = MULT16_16_P15(x,x);
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return ADD16(1,MIN16(32766,ADD32(SUB16(L1,x2), MULT16_16_P15(x2, ADD32(L2, MULT16_16_P15(x2, ADD32(L3, MULT16_16_P15(L4, x2
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))))))));
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}
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#undef L1
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#undef L2
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#undef L3
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#undef L4
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static inline celt_word16_t celt_cos_norm(celt_word32_t x)
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{
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x = x&0x0001ffff;
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if (x>SHL32(EXTEND32(1), 16))
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x = SUB32(SHL32(EXTEND32(1), 17),x);
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if (x&0x00007fff)
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{
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if (x<SHL32(EXTEND32(1), 15))
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{
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return _celt_cos_pi_2(EXTRACT16(x));
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} else {
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return NEG32(_celt_cos_pi_2(EXTRACT16(65536-x)));
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}
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} else {
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if (x&0x0000ffff)
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return 0;
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else if (x&0x0001ffff)
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return -32767;
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else
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return 32767;
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}
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}
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#endif
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#endif
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