ref: b4f308a2f9b4be46e0993fb765f428d3f1d8ffa3
dir: /silk/float/silk_LTP_scale_ctrl_FLP.c/
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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "silk_main_FLP.h"
void silk_LTP_scale_ctrl_FLP(
silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
silk_encoder_control_FLP *psEncCtrl /* I/O Encoder control FLP */
)
{
opus_int round_loss;
/* 1st order high-pass filter */
/*g_HP(n) = g(n) - 0.5 * g(n-1) + 0.5 * g_HP(n-1);*/
psEnc->HPLTPredCodGain = SKP_max_float( psEncCtrl->LTPredCodGain - 0.5f * psEnc->prevLTPredCodGain, 0.0f )
+ 0.5f * psEnc->HPLTPredCodGain;
psEnc->prevLTPredCodGain = psEncCtrl->LTPredCodGain;
/* Only scale if first frame in packet */
if( psEnc->sCmn.nFramesEncoded == 0 ) {
round_loss = psEnc->sCmn.PacketLoss_perc + psEnc->sCmn.nFramesPerPacket;
psEnc->sCmn.indices.LTP_scaleIndex = (opus_int8)SKP_LIMIT( round_loss * psEnc->HPLTPredCodGain * 0.1f, 0.0f, 2.0f );
} else {
/* Default is minimum scaling */
psEnc->sCmn.indices.LTP_scaleIndex = 0;
}
psEncCtrl->LTP_scale = (SKP_float)silk_LTPScales_table_Q14[ psEnc->sCmn.indices.LTP_scaleIndex ] / 16384.0f;
}