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