80 lines
4.2 KiB
C
80 lines
4.2 KiB
C
/***********************************************************************
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Copyright (c) 2006-2010, 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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* File Name: SKP_Silk_resample_3_4.c *
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* *
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* Resamples by a factor 3/4 *
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* *
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* Copyright 2009 (c), Skype Limited *
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* All rights reserved. *
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* *
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* Date: 090408 *
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* */
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#include "SKP_Silk_SigProc_FIX.h"
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#define IN_SUBFR_LEN_RESAMPLE_3_4 80
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/* Resamples by a factor 3/4 */
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void SKP_Silk_resample_3_4(
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SKP_int16 *out, /* O: Fs_high signal [inLen*3/4] */
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SKP_int32 *S, /* I/O: State vector [7+2+6] */
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const SKP_int16 *in, /* I: Fs_low signal [inLen] */
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SKP_int inLen /* I: Input length, must be a multiple of 4 */
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)
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{
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SKP_int LSubFrameIn, LSubFrameOut;
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SKP_int16 outH[ 3 * IN_SUBFR_LEN_RESAMPLE_3_4 ];
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SKP_int16 outL[ ( 3 * IN_SUBFR_LEN_RESAMPLE_3_4 ) / 2 ];
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SKP_int32 scratch[ ( 9 * IN_SUBFR_LEN_RESAMPLE_3_4 ) / 2 ];
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/* Check that input is multiple of 4 */
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SKP_assert( inLen % 4 == 0 );
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while( inLen > 0 ) {
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LSubFrameIn = SKP_min_int( IN_SUBFR_LEN_RESAMPLE_3_4, inLen );
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LSubFrameOut = SKP_SMULWB( 49152, LSubFrameIn );
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/* Upsample by a factor 3 */
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SKP_Silk_resample_3_1( outH, &S[ 0 ], in, LSubFrameIn );
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/* Downsample by a factor 2 twice */
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/* Scratch size needs to be: 3 * 2 * LSubFrameOut * sizeof( SKP_int32 ) */
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/* I: state vector [2], scratch memory [3*len] */
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SKP_Silk_resample_1_2_coarsest( outH, &S[ 7 ], outL, scratch, SKP_LSHIFT( LSubFrameOut, 1 ) );
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/* Scratch size needs to be: 3 * LSubFrameOut * sizeof( SKP_int32 ) */
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/* I: state vector [6], scratch memory [3*len] */
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SKP_Silk_resample_1_2_coarse( outL, &S[ 9 ], out, scratch, LSubFrameOut );
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in += LSubFrameIn;
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out += LSubFrameOut;
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inLen -= LSubFrameIn;
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}
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}
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