82 lines
3.8 KiB
C
82 lines
3.8 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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#include "SKP_Silk_main_FIX.h"
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#define NB_THRESHOLDS 11
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/* Table containing trained thresholds for LTP scaling */
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static const SKP_int16 LTPScaleThresholds_Q15[ NB_THRESHOLDS ] =
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{
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31129, 26214, 16384, 13107, 9830, 6554,
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4915, 3276, 2621, 2458, 0
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};
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void SKP_Silk_LTP_scale_ctrl_FIX(
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SKP_Silk_encoder_state_FIX *psEnc, /* I/O encoder state FIX */
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SKP_Silk_encoder_control_FIX *psEncCtrl /* I/O encoder control FIX */
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)
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{
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SKP_int round_loss, frames_per_packet;
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SKP_int g_out_Q5, g_limit_Q15, thrld1_Q15, thrld2_Q15;
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/* 1st order high-pass filter */
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psEnc->HPLTPredCodGain_Q7 = SKP_max_int( psEncCtrl->LTPredCodGain_Q7 - psEnc->prevLTPredCodGain_Q7, 0 )
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+ SKP_RSHIFT_ROUND( psEnc->HPLTPredCodGain_Q7, 1 );
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psEnc->prevLTPredCodGain_Q7 = psEncCtrl->LTPredCodGain_Q7;
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/* combine input and filtered input */
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g_out_Q5 = SKP_RSHIFT_ROUND( SKP_RSHIFT( psEncCtrl->LTPredCodGain_Q7, 1 ) + SKP_RSHIFT( psEnc->HPLTPredCodGain_Q7, 1 ), 3 );
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g_limit_Q15 = SKP_Silk_sigm_Q15( g_out_Q5 - ( 3 << 5 ) );
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/* Default is minimum scaling */
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psEncCtrl->sCmn.LTP_scaleIndex = 0;
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/* Round the loss measure to whole pct */
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round_loss = ( SKP_int )psEnc->sCmn.PacketLoss_perc;
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/* Only scale if first frame in packet 0% */
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if( psEnc->sCmn.nFramesInPayloadBuf == 0 ) {
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frames_per_packet = SKP_DIV32_16( psEnc->sCmn.PacketSize_ms, FRAME_LENGTH_MS );
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round_loss += frames_per_packet - 1;
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thrld1_Q15 = LTPScaleThresholds_Q15[ SKP_min_int( round_loss, NB_THRESHOLDS - 1 ) ];
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thrld2_Q15 = LTPScaleThresholds_Q15[ SKP_min_int( round_loss + 1, NB_THRESHOLDS - 1 ) ];
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if( g_limit_Q15 > thrld1_Q15 ) {
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/* Maximum scaling */
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psEncCtrl->sCmn.LTP_scaleIndex = 2;
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} else if( g_limit_Q15 > thrld2_Q15 ) {
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/* Medium scaling */
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psEncCtrl->sCmn.LTP_scaleIndex = 1;
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}
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}
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psEncCtrl->LTP_scale_Q14 = SKP_Silk_LTPScales_table_Q14[ psEncCtrl->sCmn.LTP_scaleIndex ];
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}
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