86 lines
4.0 KiB
C
Executable File
86 lines
4.0 KiB
C
Executable File
/***********************************************************************
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Copyright (c) 2006-2012, 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_FLP.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_float LTPScaleThresholds[ NB_THRESHOLDS ] =
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{
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0.95f, 0.8f, 0.50f, 0.400f, 0.3f, 0.2f,
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0.15f, 0.1f, 0.08f, 0.075f, 0.0f
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};
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void SKP_Silk_LTP_scale_ctrl_FLP(
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SKP_Silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
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SKP_Silk_encoder_control_FLP *psEncCtrl /* I/O Encoder control FLP */
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)
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{
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SKP_int round_loss, frames_per_packet;
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SKP_float g_out, g_limit, thrld1, thrld2;
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/* 1st order high-pass filter */
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//g_HP(n) = g(n) - g(n-1) + 0.5 * g_HP(n-1); // tune the 0.5: higher means longer impact of jump
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psEnc->HPLTPredCodGain = SKP_max_float( psEncCtrl->LTPredCodGain - psEnc->prevLTPredCodGain, 0.0f )
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+ 0.5f * psEnc->HPLTPredCodGain;
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psEnc->prevLTPredCodGain = psEncCtrl->LTPredCodGain;
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/* Combine input and filtered input */
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g_out = 0.5f * psEncCtrl->LTPredCodGain + ( 1.0f - 0.5f ) * psEnc->HPLTPredCodGain;
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g_limit = SKP_sigmoid( 0.5f * ( g_out - 6 ) );
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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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round_loss = SKP_max( 0, round_loss );
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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 = psEnc->sCmn.PacketSize_ms / FRAME_LENGTH_MS;
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round_loss += ( frames_per_packet - 1 );
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thrld1 = LTPScaleThresholds[ SKP_min_int( round_loss, NB_THRESHOLDS - 1 ) ];
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thrld2 = LTPScaleThresholds[ SKP_min_int( round_loss + 1, NB_THRESHOLDS - 1 ) ];
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if( g_limit > thrld1 ) {
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/* High Scaling */
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psEncCtrl->sCmn.LTP_scaleIndex = 2;
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} else if( g_limit > thrld2 ) {
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/* Middle 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 = ( SKP_float)SKP_Silk_LTPScales_table_Q14[ psEncCtrl->sCmn.LTP_scaleIndex ] / 16384.0f;
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}
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