cadb3627fc
librbcodec users must provide these two files when the library is built. rbcodecconfig.h provides configuration #defines and basic types, and will be included by public librbcodec headers, so it must not conflict with the user's code. rbcodecplatform.h provides various OS functions, and will only be included by source files and private headers. This system is intended to provide maximum flexibility for use on embedded systems, where no operating system headers are included. Unix systems can just copy rbcodecconfig-example.h and rbcodecplatform-unix.h with minimal changes. Change-Id: I350a2274d173da391fd1ca00c4202e9760d91def Reviewed-on: http://gerrit.rockbox.org/143 Reviewed-by: Nils Wallménius <nils@rockbox.org> Tested-by: Nils Wallménius <nils@rockbox.org>
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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