ref: 817220e91d67215ed3d21ef683f5b605fed12544
dir: /silk/fixed/silk_LTP_scale_ctrl_FIX.c/
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#include "silk_main_FIX.h"
void silk_LTP_scale_ctrl_FIX(
silk_encoder_state_FIX *psEnc, /* I/O encoder state FIX */
silk_encoder_control_FIX *psEncCtrl /* I/O encoder control FIX */
)
{
opus_int round_loss;
/* 1st order high-pass filter */
psEnc->HPLTPredCodGain_Q7 = SKP_max_int( psEncCtrl->LTPredCodGain_Q7 - SKP_RSHIFT( psEnc->prevLTPredCodGain_Q7, 1 ), 0 )
+ SKP_RSHIFT( psEnc->HPLTPredCodGain_Q7, 1 );
psEnc->prevLTPredCodGain_Q7 = psEncCtrl->LTPredCodGain_Q7;
/* Only scale if first frame in packet */
if( psEnc->sCmn.nFramesEncoded == 0 ) {
round_loss = psEnc->sCmn.PacketLoss_perc + psEnc->sCmn.nFramesPerPacket - 1;
psEnc->sCmn.indices.LTP_scaleIndex = (opus_int8)SKP_LIMIT(
SKP_SMULWB( SKP_SMULBB( round_loss, psEnc->HPLTPredCodGain_Q7 ), SILK_FIX_CONST( 0.1, 9 ) ), 0, 2 );
} else {
/* Default is minimum scaling */
psEnc->sCmn.indices.LTP_scaleIndex = 0;
}
psEncCtrl->LTP_scale_Q14 = silk_LTPScales_table_Q14[ psEnc->sCmn.indices.LTP_scaleIndex ];
}