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//#ifdef HAVE_CONFIG_H
#include "../../config.h"
//#endif

#include "main_FIX.h"
#include "../../celt/stack_alloc.h"
#include "../tuning_parameters.h"

/* Find pitch lags */
void silk_find_pitch_lags_FIX(
    silk_encoder_state_FIX          *psEnc,                                 /* I/O  encoder state                                                               */
    silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  encoder control                                                             */
    opus_int16                      res[],                                  /* O    residual                                                                    */
    const opus_int16                x[],                                    /* I    Speech signal                                                               */
    int                             arch                                    /* I    Run-time architecture                                                       */
) {
    opus_int   buf_len, i, scale;
    opus_int32 thrhld_Q13, res_nrg;
    const opus_int16 *x_ptr;
    VARDECL(opus_int16, Wsig);
    opus_int16 *Wsig_ptr;
    opus_int32 auto_corr[ MAX_FIND_PITCH_LPC_ORDER + 1 ];
    opus_int16 rc_Q15[    MAX_FIND_PITCH_LPC_ORDER ];
    opus_int32 A_Q24[     MAX_FIND_PITCH_LPC_ORDER ];
    opus_int16 A_Q12[     MAX_FIND_PITCH_LPC_ORDER ];
    SAVE_STACK;

    /******************************************/
    /* Set up buffer lengths etc based on Fs  */
    /******************************************/
    buf_len = psEnc->sCmn.la_pitch + psEnc->sCmn.frame_length + psEnc->sCmn.ltp_mem_length;

    /* Safety check */
    celt_assert(buf_len >= psEnc->sCmn.pitch_LPC_win_length);

    /*************************************/
    /* Estimate LPC AR coefficients      */
    /*************************************/

    /* Calculate windowed signal */

    ALLOC(Wsig, psEnc->sCmn.pitch_LPC_win_length, opus_int16);

    /* First LA_LTP samples */
    x_ptr = x + buf_len - psEnc->sCmn.pitch_LPC_win_length;
    Wsig_ptr  = Wsig;
    silk_apply_sine_window(Wsig_ptr, x_ptr, 1, psEnc->sCmn.la_pitch);

    /* Middle un - windowed samples */
    Wsig_ptr  += psEnc->sCmn.la_pitch;
    x_ptr += psEnc->sCmn.la_pitch;
    silk_memcpy(Wsig_ptr, x_ptr, (psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT(psEnc->sCmn.la_pitch, 1)) * sizeof(opus_int16));

    /* Last LA_LTP samples */
    Wsig_ptr  += psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT(psEnc->sCmn.la_pitch, 1);
    x_ptr += psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT(psEnc->sCmn.la_pitch, 1);
    silk_apply_sine_window(Wsig_ptr, x_ptr, 2, psEnc->sCmn.la_pitch);

    /* Calculate autocorrelation sequence */
    silk_autocorr(auto_corr, &scale, Wsig, psEnc->sCmn.pitch_LPC_win_length, psEnc->sCmn.pitchEstimationLPCOrder + 1, arch);

    /* Add white noise, as fraction of energy */
    auto_corr[ 0 ] = silk_SMLAWB(auto_corr[ 0 ], auto_corr[ 0 ], SILK_FIX_CONST(FIND_PITCH_WHITE_NOISE_FRACTION, 16)) + 1;

    /* Calculate the reflection coefficients using schur */
    res_nrg = silk_schur(rc_Q15, auto_corr, psEnc->sCmn.pitchEstimationLPCOrder);

    /* Prediction gain */
    psEncCtrl->predGain_Q16 = silk_DIV32_varQ(auto_corr[ 0 ], silk_max_int(res_nrg, 1), 16);

    /* Convert reflection coefficients to prediction coefficients */
    silk_k2a(A_Q24, rc_Q15, psEnc->sCmn.pitchEstimationLPCOrder);

    /* Convert From 32 bit Q24 to 16 bit Q12 coefs */
    for (i = 0; i < psEnc->sCmn.pitchEstimationLPCOrder; i++) {
        A_Q12[ i ] = (opus_int16)silk_SAT16(silk_RSHIFT(A_Q24[ i ], 12));
    }

    /* Do BWE */
    silk_bwexpander(A_Q12, psEnc->sCmn.pitchEstimationLPCOrder, SILK_FIX_CONST(FIND_PITCH_BANDWIDTH_EXPANSION, 16));

    /*****************************************/
    /* LPC analysis filtering                */
    /*****************************************/
    silk_LPC_analysis_filter(res, x, A_Q12, buf_len, psEnc->sCmn.pitchEstimationLPCOrder, psEnc->sCmn.arch);

    if (psEnc->sCmn.indices.signalType != TYPE_NO_VOICE_ACTIVITY && psEnc->sCmn.first_frame_after_reset == 0) {
        /* Threshold for pitch estimator */
        thrhld_Q13 = SILK_FIX_CONST(0.6, 13);
        thrhld_Q13 = silk_SMLABB(thrhld_Q13, SILK_FIX_CONST(-0.004, 13), psEnc->sCmn.pitchEstimationLPCOrder);
        thrhld_Q13 = silk_SMLAWB(thrhld_Q13, SILK_FIX_CONST(-0.1,   21), psEnc->sCmn.speech_activity_Q8);
        thrhld_Q13 = silk_SMLABB(thrhld_Q13, SILK_FIX_CONST(-0.15,  13), silk_RSHIFT(psEnc->sCmn.prevSignalType, 1));
        thrhld_Q13 = silk_SMLAWB(thrhld_Q13, SILK_FIX_CONST(-0.1,   14), psEnc->sCmn.input_tilt_Q15);
        thrhld_Q13 = silk_SAT16(thrhld_Q13);

        /*****************************************/
        /* Call pitch estimator                  */
        /*****************************************/
        if (silk_pitch_analysis_core(res, psEncCtrl->pitchL, &psEnc->sCmn.indices.lagIndex, &psEnc->sCmn.indices.contourIndex,
                                     &psEnc->LTPCorr_Q15, psEnc->sCmn.prevLag, psEnc->sCmn.pitchEstimationThreshold_Q16,
                                     (opus_int)thrhld_Q13, psEnc->sCmn.fs_kHz, psEnc->sCmn.pitchEstimationComplexity, psEnc->sCmn.nb_subfr,
                                     psEnc->sCmn.arch) == 0) {
            psEnc->sCmn.indices.signalType = TYPE_VOICED;
        } else {
            psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
        }
    } else {
        silk_memset(psEncCtrl->pitchL, 0, sizeof(psEncCtrl->pitchL));
        psEnc->sCmn.indices.lagIndex = 0;
        psEnc->sCmn.indices.contourIndex = 0;
        psEnc->LTPCorr_Q15 = 0;
    }
    RESTORE_STACK;
}
