/***********************************************************************

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***********************************************************************/

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include "main_FIX.h"

#include "stack_alloc.h"

#include "tuning_parameters.h"

/* Compute gain to make warped filter coefficients have a zero mean log frequency response on a   */

/* non-warped frequency scale. (So that it can be implemented with a minimum-phase monic filter.) */

/* Note: A monic filter is one with the first coefficient equal to 1.0. In Silk we omit the first */

/* coefficient in an array of coefficients, for monic filters.                                    */

static OPUS_INLINE opus_int32 warped_gain( /* gain in Q16*/

    const opus_int32     *coefs_Q24,

    opus_int             lambda_Q16,

    opus_int             order

) {

    opus_int   i;

    opus_int32 gain_Q24;

    lambda_Q16 = -lambda_Q16;

    gain_Q24 = coefs_Q24[ order - 1 ];

    for( i = order - 2; i >= 0; i-- ) {

        gain_Q24 = silk_SMLAWB( coefs_Q24[ i ], gain_Q24, lambda_Q16 );

    }

    gain_Q24  = silk_SMLAWB( SILK_FIX_CONST( 1.0, 24 ), gain_Q24, -lambda_Q16 );

    return silk_INVERSE32_varQ( gain_Q24, 40 );

}

/* Convert warped filter coefficients to monic pseudo-warped coefficients and limit maximum     */

/* amplitude of monic warped coefficients by using bandwidth expansion on the true coefficients */

static OPUS_INLINE void limit_warped_coefs(

    opus_int32           *coefs_Q24,

    opus_int             lambda_Q16,

    opus_int32           limit_Q24,

    opus_int             order

) {

    opus_int   i, iter, ind = 0;

    opus_int32 tmp, maxabs_Q24, chirp_Q16, gain_Q16;

    opus_int32 nom_Q16, den_Q24;

    opus_int32 limit_Q20, maxabs_Q20;

    /* Convert to monic coefficients */

    lambda_Q16 = -lambda_Q16;

    for( i = order - 1; i > 0; i-- ) {

        coefs_Q24[ i - 1 ] = silk_SMLAWB( coefs_Q24[ i - 1 ], coefs_Q24[ i ], lambda_Q16 );

    }

    lambda_Q16 = -lambda_Q16;

    nom_Q16  = silk_SMLAWB( SILK_FIX_CONST( 1.0, 16 ), -(opus_int32)lambda_Q16, lambda_Q16 );

    den_Q24  = silk_SMLAWB( SILK_FIX_CONST( 1.0, 24 ), coefs_Q24[ 0 ], lambda_Q16 );

    gain_Q16 = silk_DIV32_varQ( nom_Q16, den_Q24, 24 );

    for( i = 0; i < order; i++ ) {

        coefs_Q24[ i ] = silk_SMULWW( gain_Q16, coefs_Q24[ i ] );

    }

    limit_Q20 = silk_RSHIFT(limit_Q24, 4);

    for( iter = 0; iter < 10; iter++ ) {

        /* Find maximum absolute value */

        maxabs_Q24 = -1;

        for( i = 0; i < order; i++ ) {

            tmp = silk_abs_int32( coefs_Q24[ i ] );

            if( tmp > maxabs_Q24 ) {

                maxabs_Q24 = tmp;

                ind = i;

            }

        }

        /* Use Q20 to avoid any overflow when multiplying by (ind + 1) later. */

        maxabs_Q20 = silk_RSHIFT(maxabs_Q24, 4);

        if( maxabs_Q20 <= limit_Q20 ) {

            /* Coefficients are within range - done */

            return;

        }

        /* Convert back to true warped coefficients */

        for( i = 1; i < order; i++ ) {

            coefs_Q24[ i - 1 ] = silk_SMLAWB( coefs_Q24[ i - 1 ], coefs_Q24[ i ], lambda_Q16 );

        }

        gain_Q16 = silk_INVERSE32_varQ( gain_Q16, 32 );

        for( i = 0; i < order; i++ ) {

            coefs_Q24[ i ] = silk_SMULWW( gain_Q16, coefs_Q24[ i ] );

        }

        /* Apply bandwidth expansion */

        chirp_Q16 = SILK_FIX_CONST( 0.99, 16 ) - silk_DIV32_varQ(

            silk_SMULWB( maxabs_Q20 - limit_Q20, silk_SMLABB( SILK_FIX_CONST( 0.8, 10 ), SILK_FIX_CONST( 0.1, 10 ), iter ) ),

            silk_MUL( maxabs_Q20, ind + 1 ), 22 );

        silk_bwexpander_32( coefs_Q24, order, chirp_Q16 );

        /* Convert to monic warped coefficients */

        lambda_Q16 = -lambda_Q16;

        for( i = order - 1; i > 0; i-- ) {

            coefs_Q24[ i - 1 ] = silk_SMLAWB( coefs_Q24[ i - 1 ], coefs_Q24[ i ], lambda_Q16 );

        }

        lambda_Q16 = -lambda_Q16;

        nom_Q16  = silk_SMLAWB( SILK_FIX_CONST( 1.0, 16 ), -(opus_int32)lambda_Q16,        lambda_Q16 );

        den_Q24  = silk_SMLAWB( SILK_FIX_CONST( 1.0, 24 ), coefs_Q24[ 0 ], lambda_Q16 );

        gain_Q16 = silk_DIV32_varQ( nom_Q16, den_Q24, 24 );

        for( i = 0; i < order; i++ ) {

            coefs_Q24[ i ] = silk_SMULWW( gain_Q16, coefs_Q24[ i ] );

        }

    }

    silk_assert( 0 );

}

/**************************************************************/

/* Compute noise shaping coefficients and initial gain values */

/**************************************************************/

void silk_noise_shape_analysis_FIX(

    silk_encoder_state_FIX          *psEnc,                                 /* I/O  Encoder state FIX                                                           */

    silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  Encoder control FIX                                                         */

    const opus_int16                *pitch_res,                             /* I    LPC residual from pitch analysis                                            */

    const opus_int16                *x,                                     /* I    Input signal [ frame_length + la_shape ]                                    */

    int                              arch                                   /* I    Run-time architecture                                                       */

)

{

    silk_shape_state_FIX *psShapeSt = &psEnc->sShape;

    opus_int     k, i, nSamples, nSegs, Qnrg, b_Q14, warping_Q16, scale = 0;

    opus_int32   SNR_adj_dB_Q7, HarmShapeGain_Q16, Tilt_Q16, tmp32;

    opus_int32   nrg, log_energy_Q7, log_energy_prev_Q7, energy_variation_Q7;

    opus_int32   BWExp_Q16, gain_mult_Q16, gain_add_Q16, strength_Q16, b_Q8;

    opus_int32   auto_corr[     MAX_SHAPE_LPC_ORDER + 1 ];

    opus_int32   refl_coef_Q16[ MAX_SHAPE_LPC_ORDER ];

    opus_int32   AR_Q24[       MAX_SHAPE_LPC_ORDER ];

    VARDECL( opus_int16, x_windowed );

    const opus_int16 *x_ptr, *pitch_res_ptr;

    SAVE_STACK;

    /* Point to start of first LPC analysis block */

    x_ptr = x - psEnc->sCmn.la_shape;

    /****************/

    /* GAIN CONTROL */

    /****************/

    SNR_adj_dB_Q7 = psEnc->sCmn.SNR_dB_Q7;

    /* Input quality is the average of the quality in the lowest two VAD bands */

    psEncCtrl->input_quality_Q14 = ( opus_int )silk_RSHIFT( (opus_int32)psEnc->sCmn.input_quality_bands_Q15[ 0 ]

        + psEnc->sCmn.input_quality_bands_Q15[ 1 ], 2 );

    /* Coding quality level, between 0.0_Q0 and 1.0_Q0, but in Q14 */

    psEncCtrl->coding_quality_Q14 = silk_RSHIFT( silk_sigm_Q15( silk_RSHIFT_ROUND( SNR_adj_dB_Q7 -

        SILK_FIX_CONST( 20.0, 7 ), 4 ) ), 1 );

    /* Reduce coding SNR during low speech activity */

    if( psEnc->sCmn.useCBR == 0 ) {

        b_Q8 = SILK_FIX_CONST( 1.0, 8 ) - psEnc->sCmn.speech_activity_Q8;

        b_Q8 = silk_SMULWB( silk_LSHIFT( b_Q8, 8 ), b_Q8 );

        SNR_adj_dB_Q7 = silk_SMLAWB( SNR_adj_dB_Q7,

            silk_SMULBB( SILK_FIX_CONST( -BG_SNR_DECR_dB, 7 ) >> ( 4 + 1 ), b_Q8 ),                                       /* Q11*/

            silk_SMULWB( SILK_FIX_CONST( 1.0, 14 ) + psEncCtrl->input_quality_Q14, psEncCtrl->coding_quality_Q14 ) );     /* Q12*/

    }

    if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {

        /* Reduce gains for periodic signals */

        SNR_adj_dB_Q7 = silk_SMLAWB( SNR_adj_dB_Q7, SILK_FIX_CONST( HARM_SNR_INCR_dB, 8 ), psEnc->LTPCorr_Q15 );

    } else {

        /* For unvoiced signals and low-quality input, adjust the quality slower than SNR_dB setting */

        SNR_adj_dB_Q7 = silk_SMLAWB( SNR_adj_dB_Q7,

            silk_SMLAWB( SILK_FIX_CONST( 6.0, 9 ), -SILK_FIX_CONST( 0.4, 18 ), psEnc->sCmn.SNR_dB_Q7 ),

            SILK_FIX_CONST( 1.0, 14 ) - psEncCtrl->input_quality_Q14 );

    }

    /*************************/

    /* SPARSENESS PROCESSING */

    /*************************/

    /* Set quantizer offset */

    if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {

        /* Initially set to 0; may be overruled in process_gains(..) */

        psEnc->sCmn.indices.quantOffsetType = 0;

    } else {

        /* Sparseness measure, based on relative fluctuations of energy per 2 milliseconds */

        nSamples = silk_LSHIFT( psEnc->sCmn.fs_kHz, 1 );

        energy_variation_Q7 = 0;

        log_energy_prev_Q7  = 0;

        pitch_res_ptr = pitch_res;

        nSegs = silk_SMULBB( SUB_FRAME_LENGTH_MS, psEnc->sCmn.nb_subfr ) / 2;

        for( k = 0; k < nSegs; k++ ) {

            silk_sum_sqr_shift( &nrg, &scale, pitch_res_ptr, nSamples );

            nrg += silk_RSHIFT( nSamples, scale );           /* Q(-scale)*/

            log_energy_Q7 = silk_lin2log( nrg );

            if( k > 0 ) {

                energy_variation_Q7 += silk_abs( log_energy_Q7 - log_energy_prev_Q7 );

            }

            log_energy_prev_Q7 = log_energy_Q7;

            pitch_res_ptr += nSamples;

        }

        /* Set quantization offset depending on sparseness measure */

        if( energy_variation_Q7 > SILK_FIX_CONST( ENERGY_VARIATION_THRESHOLD_QNT_OFFSET, 7 ) * (nSegs-1) ) {

            psEnc->sCmn.indices.quantOffsetType = 0;

        } else {

            psEnc->sCmn.indices.quantOffsetType = 1;

        }

    }

    /*******************************/

    /* Control bandwidth expansion */

    /*******************************/

    /* More BWE for signals with high prediction gain */

    strength_Q16 = silk_SMULWB( psEncCtrl->predGain_Q16, SILK_FIX_CONST( FIND_PITCH_WHITE_NOISE_FRACTION, 16 ) );

    BWExp_Q16 = silk_DIV32_varQ( SILK_FIX_CONST( BANDWIDTH_EXPANSION, 16 ),

        silk_SMLAWW( SILK_FIX_CONST( 1.0, 16 ), strength_Q16, strength_Q16 ), 16 );

    if( psEnc->sCmn.warping_Q16 > 0 ) {

        /* Slightly more warping in analysis will move quantization noise up in frequency, where it's better masked */

        warping_Q16 = silk_SMLAWB( psEnc->sCmn.warping_Q16, (opus_int32)psEncCtrl->coding_quality_Q14, SILK_FIX_CONST( 0.01, 18 ) );

    } else {

        warping_Q16 = 0;

    }

    /********************************************/

    /* Compute noise shaping AR coefs and gains */

    /********************************************/

    ALLOC( x_windowed, psEnc->sCmn.shapeWinLength, opus_int16 );

    for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {

        /* Apply window: sine slope followed by flat part followed by cosine slope */

        opus_int shift, slope_part, flat_part;

        flat_part = psEnc->sCmn.fs_kHz * 3;

        slope_part = silk_RSHIFT( psEnc->sCmn.shapeWinLength - flat_part, 1 );

        silk_apply_sine_window( x_windowed, x_ptr, 1, slope_part );

        shift = slope_part;

        silk_memcpy( x_windowed + shift, x_ptr + shift, flat_part * sizeof(opus_int16) );

        shift += flat_part;

        silk_apply_sine_window( x_windowed + shift, x_ptr + shift, 2, slope_part );

        /* Update pointer: next LPC analysis block */

        x_ptr += psEnc->sCmn.subfr_length;

        if( psEnc->sCmn.warping_Q16 > 0 ) {

            /* Calculate warped auto correlation */

            silk_warped_autocorrelation_FIX( auto_corr, &scale, x_windowed, warping_Q16, psEnc->sCmn.shapeWinLength, psEnc->sCmn.shapingLPCOrder, arch );

        } else {

            /* Calculate regular auto correlation */

            silk_autocorr( auto_corr, &scale, x_windowed, psEnc->sCmn.shapeWinLength, psEnc->sCmn.shapingLPCOrder + 1, arch );

        }

        /* Add white noise, as a fraction of energy */

        auto_corr[0] = silk_ADD32( auto_corr[0], silk_max_32( silk_SMULWB( silk_RSHIFT( auto_corr[ 0 ], 4 ),

            SILK_FIX_CONST( SHAPE_WHITE_NOISE_FRACTION, 20 ) ), 1 ) );

        /* Calculate the reflection coefficients using schur */

        nrg = silk_schur64( refl_coef_Q16, auto_corr, psEnc->sCmn.shapingLPCOrder );

        silk_assert( nrg >= 0 );

        /* Convert reflection coefficients to prediction coefficients */

        silk_k2a_Q16( AR_Q24, refl_coef_Q16, psEnc->sCmn.shapingLPCOrder );

        Qnrg = -scale;          /* range: -12...30*/

        silk_assert( Qnrg >= -12 );

        silk_assert( Qnrg <=  30 );

        /* Make sure that Qnrg is an even number */

        if( Qnrg & 1 ) {

            Qnrg -= 1;

            nrg >>= 1;

        }

        tmp32 = silk_SQRT_APPROX( nrg );

        Qnrg >>= 1;             /* range: -6...15*/

        psEncCtrl->Gains_Q16[ k ] = silk_LSHIFT_SAT32( tmp32, 16 - Qnrg );

        if( psEnc->sCmn.warping_Q16 > 0 ) {

            /* Adjust gain for warping */

            gain_mult_Q16 = warped_gain( AR_Q24, warping_Q16, psEnc->sCmn.shapingLPCOrder );

            silk_assert( psEncCtrl->Gains_Q16[ k ] > 0 );

            if( psEncCtrl->Gains_Q16[ k ] < SILK_FIX_CONST( 0.25, 16 ) ) {

                psEncCtrl->Gains_Q16[ k ] = silk_SMULWW( psEncCtrl->Gains_Q16[ k ], gain_mult_Q16 );

            } else {

                psEncCtrl->Gains_Q16[ k ] = silk_SMULWW( silk_RSHIFT_ROUND( psEncCtrl->Gains_Q16[ k ], 1 ), gain_mult_Q16 );

                if ( psEncCtrl->Gains_Q16[ k ] >= ( silk_int32_MAX >> 1 ) ) {

                    psEncCtrl->Gains_Q16[ k ] = silk_int32_MAX;

                } else {

                    psEncCtrl->Gains_Q16[ k ] = silk_LSHIFT32( psEncCtrl->Gains_Q16[ k ], 1 );

                }

            }

            silk_assert( psEncCtrl->Gains_Q16[ k ] > 0 );

        }

        /* Bandwidth expansion */

        silk_bwexpander_32( AR_Q24, psEnc->sCmn.shapingLPCOrder, BWExp_Q16 );

        if( psEnc->sCmn.warping_Q16 > 0 ) {

            /* Convert to monic warped prediction coefficients and limit absolute values */

            limit_warped_coefs( AR_Q24, warping_Q16, SILK_FIX_CONST( 3.999, 24 ), psEnc->sCmn.shapingLPCOrder );

            /* Convert from Q24 to Q13 and store in int16 */

            for( i = 0; i < psEnc->sCmn.shapingLPCOrder; i++ ) {

                psEncCtrl->AR_Q13[ k * MAX_SHAPE_LPC_ORDER + i ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( AR_Q24[ i ], 11 ) );

            }

        } else {

            silk_LPC_fit( &psEncCtrl->AR_Q13[ k * MAX_SHAPE_LPC_ORDER ], AR_Q24, 13, 24, psEnc->sCmn.shapingLPCOrder );

        }

    }

    /*****************/

    /* Gain tweaking */

    /*****************/

    /* Increase gains during low speech activity and put lower limit on gains */

    gain_mult_Q16 = silk_log2lin( -silk_SMLAWB( -SILK_FIX_CONST( 16.0, 7 ), SNR_adj_dB_Q7, SILK_FIX_CONST( 0.16, 16 ) ) );

    gain_add_Q16  = silk_log2lin(  silk_SMLAWB(  SILK_FIX_CONST( 16.0, 7 ), SILK_FIX_CONST( MIN_QGAIN_DB, 7 ), SILK_FIX_CONST( 0.16, 16 ) ) );

    silk_assert( gain_mult_Q16 > 0 );

    for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {

        psEncCtrl->Gains_Q16[ k ] = silk_SMULWW( psEncCtrl->Gains_Q16[ k ], gain_mult_Q16 );

        silk_assert( psEncCtrl->Gains_Q16[ k ] >= 0 );

        psEncCtrl->Gains_Q16[ k ] = silk_ADD_POS_SAT32( psEncCtrl->Gains_Q16[ k ], gain_add_Q16 );

    }

    /************************************************/

    /* Control low-frequency shaping and noise tilt */

    /************************************************/

    /* Less low frequency shaping for noisy inputs */

    strength_Q16 = silk_MUL( SILK_FIX_CONST( LOW_FREQ_SHAPING, 4 ), silk_SMLAWB( SILK_FIX_CONST( 1.0, 12 ),

        SILK_FIX_CONST( LOW_QUALITY_LOW_FREQ_SHAPING_DECR, 13 ), psEnc->sCmn.input_quality_bands_Q15[ 0 ] - SILK_FIX_CONST( 1.0, 15 ) ) );

    strength_Q16 = silk_RSHIFT( silk_MUL( strength_Q16, psEnc->sCmn.speech_activity_Q8 ), 8 );

    if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {

        /* Reduce low frequencies quantization noise for periodic signals, depending on pitch lag */

        /*f = 400; freqz([1, -0.98 + 2e-4 * f], [1, -0.97 + 7e-4 * f], 2^12, Fs); axis([0, 1000, -10, 1])*/

        opus_int fs_kHz_inv = silk_DIV32_16( SILK_FIX_CONST( 0.2, 14 ), psEnc->sCmn.fs_kHz );

        for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {

            b_Q14 = fs_kHz_inv + silk_DIV32_16( SILK_FIX_CONST( 3.0, 14 ), psEncCtrl->pitchL[ k ] );

            /* Pack two coefficients in one int32 */

            psEncCtrl->LF_shp_Q14[ k ]  = silk_LSHIFT( SILK_FIX_CONST( 1.0, 14 ) - b_Q14 - silk_SMULWB( strength_Q16, b_Q14 ), 16 );

            psEncCtrl->LF_shp_Q14[ k ] |= (opus_uint16)( b_Q14 - SILK_FIX_CONST( 1.0, 14 ) );

        }

        silk_assert( SILK_FIX_CONST( HARM_HP_NOISE_COEF, 24 ) < SILK_FIX_CONST( 0.5, 24 ) ); /* Guarantees that second argument to SMULWB() is within range of an opus_int16*/

        Tilt_Q16 = - SILK_FIX_CONST( HP_NOISE_COEF, 16 ) -

            silk_SMULWB( SILK_FIX_CONST( 1.0, 16 ) - SILK_FIX_CONST( HP_NOISE_COEF, 16 ),

                silk_SMULWB( SILK_FIX_CONST( HARM_HP_NOISE_COEF, 24 ), psEnc->sCmn.speech_activity_Q8 ) );

    } else {

        b_Q14 = silk_DIV32_16( 21299, psEnc->sCmn.fs_kHz ); /* 1.3_Q0 = 21299_Q14*/

        /* Pack two coefficients in one int32 */

        psEncCtrl->LF_shp_Q14[ 0 ]  = silk_LSHIFT( SILK_FIX_CONST( 1.0, 14 ) - b_Q14 -

            silk_SMULWB( strength_Q16, silk_SMULWB( SILK_FIX_CONST( 0.6, 16 ), b_Q14 ) ), 16 );

        psEncCtrl->LF_shp_Q14[ 0 ] |= (opus_uint16)( b_Q14 - SILK_FIX_CONST( 1.0, 14 ) );

        for( k = 1; k < psEnc->sCmn.nb_subfr; k++ ) {

            psEncCtrl->LF_shp_Q14[ k ] = psEncCtrl->LF_shp_Q14[ 0 ];

        }

        Tilt_Q16 = -SILK_FIX_CONST( HP_NOISE_COEF, 16 );

    }

    /****************************/

    /* HARMONIC SHAPING CONTROL */

    /****************************/

    if( USE_HARM_SHAPING && psEnc->sCmn.indices.signalType == TYPE_VOICED ) {

        /* More harmonic noise shaping for high bitrates or noisy input */

        HarmShapeGain_Q16 = silk_SMLAWB( SILK_FIX_CONST( HARMONIC_SHAPING, 16 ),

                SILK_FIX_CONST( 1.0, 16 ) - silk_SMULWB( SILK_FIX_CONST( 1.0, 18 ) - silk_LSHIFT( psEncCtrl->coding_quality_Q14, 4 ),

                psEncCtrl->input_quality_Q14 ), SILK_FIX_CONST( HIGH_RATE_OR_LOW_QUALITY_HARMONIC_SHAPING, 16 ) );

        /* Less harmonic noise shaping for less periodic signals */

        HarmShapeGain_Q16 = silk_SMULWB( silk_LSHIFT( HarmShapeGain_Q16, 1 ),

            silk_SQRT_APPROX( silk_LSHIFT( psEnc->LTPCorr_Q15, 15 ) ) );

    } else {

        HarmShapeGain_Q16 = 0;

    }

    /*************************/

    /* Smooth over subframes */

    /*************************/

    for( k = 0; k < MAX_NB_SUBFR; k++ ) {

        psShapeSt->HarmShapeGain_smth_Q16 =

            silk_SMLAWB( psShapeSt->HarmShapeGain_smth_Q16, HarmShapeGain_Q16 - psShapeSt->HarmShapeGain_smth_Q16, SILK_FIX_CONST( SUBFR_SMTH_COEF, 16 ) );

        psShapeSt->Tilt_smth_Q16 =

            silk_SMLAWB( psShapeSt->Tilt_smth_Q16,          Tilt_Q16          - psShapeSt->Tilt_smth_Q16,          SILK_FIX_CONST( SUBFR_SMTH_COEF, 16 ) );

        psEncCtrl->HarmShapeGain_Q14[ k ] = ( opus_int )silk_RSHIFT_ROUND( psShapeSt->HarmShapeGain_smth_Q16, 2 );

        psEncCtrl->Tilt_Q14[ k ]          = ( opus_int )silk_RSHIFT_ROUND( psShapeSt->Tilt_smth_Q16,          2 );

    }

    RESTORE_STACK;

}