ref: a6b4e25628b3ea2671aec87058805b83c5b48b34
dir: /silk/float/silk_process_gains_FLP.c/
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#include "silk_main_FLP.h"
#include "silk_tuning_parameters.h"
/* Processing of gains */
void silk_process_gains_FLP(
silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
silk_encoder_control_FLP *psEncCtrl /* I/O Encoder control FLP */
)
{
silk_shape_state_FLP *psShapeSt = &psEnc->sShape;
opus_int k;
opus_int32 pGains_Q16[ MAX_NB_SUBFR ];
SKP_float s, InvMaxSqrVal, gain, quant_offset;
/* Gain reduction when LTP coding gain is high */
if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
s = 1.0f - 0.5f * SKP_sigmoid( 0.25f * ( psEncCtrl->LTPredCodGain - 12.0f ) );
for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
psEncCtrl->Gains[ k ] *= s;
}
}
/* Limit the quantized signal */
InvMaxSqrVal = ( SKP_float )( pow( 2.0f, 0.33f * ( 21.0f - psEnc->sCmn.SNR_dB_Q7 * ( 1 / 128.0f ) ) ) / psEnc->sCmn.subfr_length );
for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
/* Soft limit on ratio residual energy and squared gains */
gain = psEncCtrl->Gains[ k ];
gain = ( SKP_float )sqrt( gain * gain + psEncCtrl->ResNrg[ k ] * InvMaxSqrVal );
psEncCtrl->Gains[ k ] = SKP_min_float( gain, 32767.0f );
}
/* Prepare gains for noise shaping quantization */
for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
pGains_Q16[ k ] = ( opus_int32 ) ( psEncCtrl->Gains[ k ] * 65536.0f );
}
/* Noise shaping quantization */
silk_gains_quant( psEnc->sCmn.indices.GainsIndices, pGains_Q16,
&psShapeSt->LastGainIndex, psEnc->sCmn.nFramesEncoded, psEnc->sCmn.nb_subfr );
/* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */
for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
psEncCtrl->Gains[ k ] = pGains_Q16[ k ] / 65536.0f;
}
/* Set quantizer offset for voiced signals. Larger offset when LTP coding gain is low or tilt is high (ie low-pass) */
if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
if( psEncCtrl->LTPredCodGain + psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f ) > 1.0f ) {
psEnc->sCmn.indices.quantOffsetType = 0;
} else {
psEnc->sCmn.indices.quantOffsetType = 1;
}
}
/* Quantizer boundary adjustment */
quant_offset = silk_Quantization_Offsets_Q10[ psEnc->sCmn.indices.signalType >> 1 ][ psEnc->sCmn.indices.quantOffsetType ] / 1024.0f;
psEncCtrl->Lambda = LAMBDA_OFFSET
+ LAMBDA_DELAYED_DECISIONS * psEnc->sCmn.nStatesDelayedDecision
+ LAMBDA_SPEECH_ACT * psEnc->sCmn.speech_activity_Q8 * ( 1.0f / 256.0f )
+ LAMBDA_INPUT_QUALITY * psEncCtrl->input_quality
+ LAMBDA_CODING_QUALITY * psEncCtrl->coding_quality
+ LAMBDA_QUANT_OFFSET * quant_offset;
SKP_assert( psEncCtrl->Lambda > 0.0f );
SKP_assert( psEncCtrl->Lambda < 2.0f );
}