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#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include "main_FLP.h"

#include "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                         */

    opus_int                        condCoding                          /* I    The type of conditional coding to use       */

)

{

    silk_shape_state_FLP *psShapeSt = &psEnc->sShape;

    opus_int     k;

    opus_int32   pGains_Q16[ MAX_NB_SUBFR ];

    silk_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 * silk_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 = ( silk_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 = ( silk_float )sqrt( gain * gain + psEncCtrl->ResNrg[ k ] * InvMaxSqrVal );

        psEncCtrl->Gains[ k ] = silk_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 );

    }

    /* Save unquantized gains and gain Index */

    silk_memcpy( psEncCtrl->GainsUnq_Q16, pGains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) );

    psEncCtrl->lastGainIndexPrev = psShapeSt->LastGainIndex;

    /* Quantize gains */

    silk_gains_quant( psEnc->sCmn.indices.GainsIndices, pGains_Q16,

            &psShapeSt->LastGainIndex, condCoding == CODE_CONDITIONALLY, 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;

    silk_assert( psEncCtrl->Lambda > 0.0f );

    silk_assert( psEncCtrl->Lambda < 2.0f );

}