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#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include "main.h"

#include "tuning_parameters.h"

void silk_quant_LTP_gains(

    opus_int16                  B_Q14[ MAX_NB_SUBFR * LTP_ORDER ],          /* O    Quantized LTP gains             */

    opus_int8                   cbk_index[ MAX_NB_SUBFR ],                  /* O    Codebook Index                  */

    opus_int8                   *periodicity_index,                         /* O    Periodicity Index               */

    opus_int32                  *sum_log_gain_Q7,                           /* I/O  Cumulative max prediction gain  */

    opus_int                    *pred_gain_dB_Q7,                           /* O    LTP prediction gain             */

    const opus_int32            XX_Q17[ MAX_NB_SUBFR*LTP_ORDER*LTP_ORDER ], /* I    Correlation matrix in Q18       */

    const opus_int32            xX_Q17[ MAX_NB_SUBFR*LTP_ORDER ],           /* I    Correlation vector in Q18       */

    const opus_int              subfr_len,                                  /* I    Number of samples per subframe  */

    const opus_int              nb_subfr,                                   /* I    Number of subframes             */

    int                         arch                                        /* I    Run-time architecture           */

)

{

    opus_int             j, k, cbk_size;

    opus_int8            temp_idx[ MAX_NB_SUBFR ];

    const opus_uint8     *cl_ptr_Q5;

    const opus_int8      *cbk_ptr_Q7;

    const opus_uint8     *cbk_gain_ptr_Q7;

    const opus_int32     *XX_Q17_ptr, *xX_Q17_ptr;

    opus_int32           res_nrg_Q15_subfr, res_nrg_Q15, rate_dist_Q7_subfr, rate_dist_Q7, min_rate_dist_Q7;

    opus_int32           sum_log_gain_tmp_Q7, best_sum_log_gain_Q7, max_gain_Q7;

    opus_int             gain_Q7;

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

    /* iterate over different codebooks with different */

    /* rates/distortions, and choose best */

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

    min_rate_dist_Q7 = silk_int32_MAX;

    best_sum_log_gain_Q7 = 0;

    for( k = 0; k < 3; k++ ) {

        /* Safety margin for pitch gain control, to take into account factors

           such as state rescaling/rewhitening. */

        opus_int32 gain_safety = SILK_FIX_CONST( 0.4, 7 );

        cl_ptr_Q5  = silk_LTP_gain_BITS_Q5_ptrs[ k ];

        cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[        k ];

        cbk_gain_ptr_Q7 = silk_LTP_vq_gain_ptrs_Q7[ k ];

        cbk_size   = silk_LTP_vq_sizes[          k ];

        /* Set up pointers to first subframe */

        XX_Q17_ptr = XX_Q17;

        xX_Q17_ptr = xX_Q17;

        res_nrg_Q15 = 0;

        rate_dist_Q7 = 0;

        sum_log_gain_tmp_Q7 = *sum_log_gain_Q7;

        for( j = 0; j < nb_subfr; j++ ) {

            max_gain_Q7 = silk_log2lin( ( SILK_FIX_CONST( MAX_SUM_LOG_GAIN_DB / 6.0, 7 ) - sum_log_gain_tmp_Q7 )

                                        + SILK_FIX_CONST( 7, 7 ) ) - gain_safety;

            silk_VQ_WMat_EC(

                &temp_idx[ j ],         /* O    index of best codebook vector                           */

                &res_nrg_Q15_subfr,     /* O    residual energy                                         */

                &rate_dist_Q7_subfr,    /* O    best weighted quantization error + mu * rate            */

                &gain_Q7,               /* O    sum of absolute LTP coefficients                        */

                XX_Q17_ptr,             /* I    correlation matrix                                      */

                xX_Q17_ptr,             /* I    correlation vector                                      */

                cbk_ptr_Q7,             /* I    codebook                                                */

                cbk_gain_ptr_Q7,        /* I    codebook effective gains                                */

                cl_ptr_Q5,              /* I    code length for each codebook vector                    */

                subfr_len,              /* I    number of samples per subframe                          */

                max_gain_Q7,            /* I    maximum sum of absolute LTP coefficients                */

                cbk_size,               /* I    number of vectors in codebook                           */

                arch                    /* I    Run-time architecture                                   */

            );

            res_nrg_Q15  = silk_ADD_POS_SAT32( res_nrg_Q15, res_nrg_Q15_subfr );

            rate_dist_Q7 = silk_ADD_POS_SAT32( rate_dist_Q7, rate_dist_Q7_subfr );

            sum_log_gain_tmp_Q7 = silk_max(0, sum_log_gain_tmp_Q7

                                + silk_lin2log( gain_safety + gain_Q7 ) - SILK_FIX_CONST( 7, 7 ));

            XX_Q17_ptr += LTP_ORDER * LTP_ORDER;

            xX_Q17_ptr += LTP_ORDER;

        }

        if( rate_dist_Q7 <= min_rate_dist_Q7 ) {

            min_rate_dist_Q7 = rate_dist_Q7;

            *periodicity_index = (opus_int8)k;

            silk_memcpy( cbk_index, temp_idx, nb_subfr * sizeof( opus_int8 ) );

            best_sum_log_gain_Q7 = sum_log_gain_tmp_Q7;

        }

    }

    cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ *periodicity_index ];

    for( j = 0; j < nb_subfr; j++ ) {

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

            B_Q14[ j * LTP_ORDER + k ] = silk_LSHIFT( cbk_ptr_Q7[ cbk_index[ j ] * LTP_ORDER + k ], 7 );

        }

    }

    if( nb_subfr == 2 ) {

        res_nrg_Q15 = silk_RSHIFT32( res_nrg_Q15, 1 );

    } else {

        res_nrg_Q15 = silk_RSHIFT32( res_nrg_Q15, 2 );

    }

    *sum_log_gain_Q7 = best_sum_log_gain_Q7;

    *pred_gain_dB_Q7 = (opus_int)silk_SMULBB( -3, silk_lin2log( res_nrg_Q15 ) - ( 15 << 7 ) );

}