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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2011 by Michael Sevakis
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#ifndef DSP_UTIL_H
#define DSP_UTIL_H
#include "gcc_extensions.h"
/** Clip sample to signed 16 bit range **/
#ifdef CPU_ARM
#if ARM_ARCH >= 6
static FORCE_INLINE int32_t clip_sample_16(int32_t sample)
{
int32_t out;
asm ("ssat %0, #16, %1"
: "=r" (out) : "r"(sample));
return out;
}
#define CLIP_SAMPLE_16_DEFINED
#endif /* ARM_ARCH */
#endif /* CPU_ARM */
#ifndef CLIP_SAMPLE_16_DEFINED
/* Generic implementation */
static FORCE_INLINE int32_t clip_sample_16(int32_t sample)
{
if ((int16_t)sample != sample)
sample = 0x7fff ^ (sample >> 31);
return sample;
}
#endif /* CLIP_SAMPLE_16_DEFINED */
#undef CLIP_SAMPLE_16_DEFINED
/* Absolute difference of signed 32-bit numbers which must be dealt with
* in the unsigned 32-bit range */
static FORCE_INLINE uint32_t ad_s32(int32_t a, int32_t b)
{
return (a >= b) ? (a - b) : (b - a);
}
#endif /* DSP_UTIL_H */
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