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DuerOS-Light-SDK-v1.1.0/duer-os-light/external/speex/libspeex/math_approx.h@47:9e361da97763, 2017-07-18 (annotated)

Committer:
TMBOY
Date:
Tue Jul 18 16:54:45 2017 +0800
Revision:
47:9e361da97763
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TMBOY 47:9e361da97763 1 /* Copyright (C) 2002 Jean-Marc Valin */
TMBOY 47:9e361da97763 2 /**
TMBOY 47:9e361da97763 3 @file math_approx.h
TMBOY 47:9e361da97763 4 @brief Various math approximation functions for Speex
TMBOY 47:9e361da97763 5 */
TMBOY 47:9e361da97763 6 /*
TMBOY 47:9e361da97763 7 Redistribution and use in source and binary forms, with or without
TMBOY 47:9e361da97763 8 modification, are permitted provided that the following conditions
TMBOY 47:9e361da97763 9 are met:
TMBOY 47:9e361da97763 10
TMBOY 47:9e361da97763 11 - Redistributions of source code must retain the above copyright
TMBOY 47:9e361da97763 12 notice, this list of conditions and the following disclaimer.
TMBOY 47:9e361da97763 13
TMBOY 47:9e361da97763 14 - Redistributions in binary form must reproduce the above copyright
TMBOY 47:9e361da97763 15 notice, this list of conditions and the following disclaimer in the
TMBOY 47:9e361da97763 16 documentation and/or other materials provided with the distribution.
TMBOY 47:9e361da97763 17
TMBOY 47:9e361da97763 18 - Neither the name of the Xiph.org Foundation nor the names of its
TMBOY 47:9e361da97763 19 contributors may be used to endorse or promote products derived from
TMBOY 47:9e361da97763 20 this software without specific prior written permission.
TMBOY 47:9e361da97763 21
TMBOY 47:9e361da97763 22 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
TMBOY 47:9e361da97763 23 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
TMBOY 47:9e361da97763 24 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
TMBOY 47:9e361da97763 25 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
TMBOY 47:9e361da97763 26 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
TMBOY 47:9e361da97763 27 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
TMBOY 47:9e361da97763 28 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
TMBOY 47:9e361da97763 29 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
TMBOY 47:9e361da97763 30 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
TMBOY 47:9e361da97763 31 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
TMBOY 47:9e361da97763 32 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
TMBOY 47:9e361da97763 33 */
TMBOY 47:9e361da97763 34
TMBOY 47:9e361da97763 35 #ifndef MATH_APPROX_H
TMBOY 47:9e361da97763 36 #define MATH_APPROX_H
TMBOY 47:9e361da97763 37
TMBOY 47:9e361da97763 38 #include "misc.h"
TMBOY 47:9e361da97763 39
TMBOY 47:9e361da97763 40 spx_word16_t spx_cos(spx_word16_t x);
TMBOY 47:9e361da97763 41 spx_int16_t spx_ilog2(spx_uint32_t x);
TMBOY 47:9e361da97763 42 spx_int16_t spx_ilog4(spx_uint32_t x);
TMBOY 47:9e361da97763 43 #ifdef FIXED_POINT
TMBOY 47:9e361da97763 44 spx_word16_t spx_sqrt(spx_word32_t x);
TMBOY 47:9e361da97763 45 spx_word16_t spx_acos(spx_word16_t x);
TMBOY 47:9e361da97763 46 spx_word32_t spx_exp(spx_word16_t x);
TMBOY 47:9e361da97763 47 spx_word16_t spx_cos_norm(spx_word32_t x);
TMBOY 47:9e361da97763 48
TMBOY 47:9e361da97763 49 /* Input in Q15, output in Q14 */
TMBOY 47:9e361da97763 50 spx_word16_t spx_atan(spx_word32_t x);
TMBOY 47:9e361da97763 51
TMBOY 47:9e361da97763 52 #else
TMBOY 47:9e361da97763 53
TMBOY 47:9e361da97763 54 #define spx_sqrt sqrt
TMBOY 47:9e361da97763 55 #define spx_acos acos
TMBOY 47:9e361da97763 56 #define spx_exp exp
TMBOY 47:9e361da97763 57 #define spx_cos_norm(x) (cos((.5f*M_PI)*(x)))
TMBOY 47:9e361da97763 58 #define spx_atan atan
TMBOY 47:9e361da97763 59
TMBOY 47:9e361da97763 60 #endif
TMBOY 47:9e361da97763 61
TMBOY 47:9e361da97763 62 #endif