mirror of
https://github.com/Rockbox/rockbox.git
synced 2025-10-29 00:36:22 -04:00
7bf62e8da6
* Redo the changes required to make Speex compile in Rockbox. Should be a bit easier to keep in sync with Speex SVN now. * Fix name of Speex library in codecs Makefile. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12254 a1c6a512-1295-4272-9138-f99709370657
62 lines
2.2 KiB
C
62 lines
2.2 KiB
C
/* Copyright (C) 2002 Jean-Marc Valin */
|
|
/**
|
|
@file math_approx.h
|
|
@brief Various math approximation functions for Speex
|
|
*/
|
|
/*
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
|
|
- Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
|
|
- Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
|
|
- Neither the name of the Xiph.org Foundation nor the names of its
|
|
contributors may be used to endorse or promote products derived from
|
|
this software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
|
|
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef MATH_APPROX_H
|
|
#define MATH_APPROX_H
|
|
|
|
#include "misc.h"
|
|
|
|
spx_word16_t spx_cos(spx_word16_t x);
|
|
spx_int16_t spx_ilog2(spx_uint32_t x);
|
|
spx_int16_t spx_ilog4(spx_uint32_t x);
|
|
#ifdef FIXED_POINT
|
|
spx_word16_t spx_sqrt(spx_word32_t x);
|
|
spx_word16_t spx_acos(spx_word16_t x);
|
|
spx_word32_t spx_exp(spx_word16_t x);
|
|
spx_word16_t spx_cos_norm(spx_word32_t x);
|
|
|
|
/* Input in Q15, output in Q14 */
|
|
spx_word16_t spx_atan(spx_word32_t x);
|
|
|
|
#else
|
|
|
|
#define spx_sqrt sqrt
|
|
#define spx_acos acos
|
|
#define spx_exp exp
|
|
#define spx_cos_norm(x) (cos((.5f*M_PI)*(x)))
|
|
#define spx_atan atan
|
|
|
|
#endif
|
|
|
|
#endif
|