69 lines
3.5 KiB
C
69 lines
3.5 KiB
C
/***********************************************************************
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Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, (subject to the limitations in the disclaimer below)
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are permitted provided that the following conditions are met:
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- Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Skype Limited, nor the names of specific
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contributors, may be used to endorse or promote products derived from
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this software without specific prior written permission.
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NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
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BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
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BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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/* *
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* SKP_Silk_int16_array_maxabs.c *
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* *
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* Function that returns the maximum absolut value of *
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* the input vector *
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* *
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* Copyright 2006 (c), Skype Limited *
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* Date: 060221 *
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* */
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#include "SKP_Silk_SigProc_FIX.h"
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/* Function that returns the maximum absolut value of the input vector */
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SKP_int16 SKP_Silk_int16_array_maxabs( /* O Maximum absolute value, max: 2^15-1 */
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const SKP_int16 *vec, /* I Input vector [len] */
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const SKP_int32 len /* I Length of input vector */
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)
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{
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SKP_int32 max = 0, i, lvl = 0, ind;
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if( len == 0 ) return 0;
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ind = len - 1;
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max = SKP_SMULBB( vec[ ind ], vec[ ind ] );
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for( i = len - 2; i >= 0; i-- ) {
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lvl = SKP_SMULBB( vec[ i ], vec[ i ] );
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if( lvl > max ) {
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max = lvl;
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ind = i;
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}
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}
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/* Do not return 32768, as it will not fit in an int16 so may lead to problems later on */
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if( max >= 1073676289 ) { // (2^15-1)^2 = 1073676289
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return( SKP_int16_MAX );
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} else {
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if( vec[ ind ] < 0 ) {
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return( -vec[ ind ] );
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} else {
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return( vec[ ind ] );
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}
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}
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}
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