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58 lines
3.2 KiB
C
58 lines
3.2 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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "main_FIX.h"
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/* Calculation of LTP state scaling */
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void silk_LTP_scale_ctrl_FIX(
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silk_encoder_state_FIX *psEnc, /* I/O encoder state */
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silk_encoder_control_FIX *psEncCtrl, /* I/O encoder control */
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opus_int condCoding /* I The type of conditional coding to use */
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)
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{
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opus_int round_loss;
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/* 1st order high-pass filter */
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psEnc->HPLTPredCodGain_Q7 = silk_max_int( psEncCtrl->LTPredCodGain_Q7 - silk_RSHIFT( psEnc->prevLTPredCodGain_Q7, 1 ), 0 )
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+ silk_RSHIFT( psEnc->HPLTPredCodGain_Q7, 1 );
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psEnc->prevLTPredCodGain_Q7 = psEncCtrl->LTPredCodGain_Q7;
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/* Only scale if first frame in packet */
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if( condCoding == CODE_INDEPENDENTLY ) {
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round_loss = psEnc->sCmn.PacketLoss_perc + psEnc->sCmn.nFramesPerPacket - 1;
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psEnc->sCmn.indices.LTP_scaleIndex = (opus_int8)silk_LIMIT(
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silk_SMULWB( silk_SMULBB( round_loss, psEnc->HPLTPredCodGain_Q7 ), SILK_FIX_CONST( 0.1, 9 ) ), 0, 2 );
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} else {
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/* Default is minimum scaling */
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psEnc->sCmn.indices.LTP_scaleIndex = 0;
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}
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psEncCtrl->LTP_scale_Q14 = silk_LTPScales_table_Q14[ psEnc->sCmn.indices.LTP_scaleIndex ];
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}
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