opus/silk/fixed/silk_find_pred_coefs_FIX.c

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#include "silk_main_FIX.h"

void silk_find_pred_coefs_FIX(
    silk_encoder_state_FIX          *psEnc,         /* I/O  encoder state                               */
    silk_encoder_control_FIX        *psEncCtrl,     /* I/O  encoder control                             */
    const opus_int16                 res_pitch[],    /* I    Residual from pitch analysis                */
    const opus_int16                 x[]             /* I    Speech signal                               */
)
{
    opus_int         i;
    opus_int32       WLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ];
    opus_int32       invGains_Q16[ MAX_NB_SUBFR ], local_gains[ MAX_NB_SUBFR ], Wght_Q15[ MAX_NB_SUBFR ];
    opus_int16       NLSF_Q15[ MAX_LPC_ORDER ];
    const opus_int16 *x_ptr;
    opus_int16       *x_pre_ptr, LPC_in_pre[ MAX_NB_SUBFR * MAX_LPC_ORDER + MAX_FRAME_LENGTH ];
    opus_int32       tmp, min_gain_Q16;
    opus_int         LTP_corrs_rshift[ MAX_NB_SUBFR ];

    /* weighting for weighted least squares */
    min_gain_Q16 = SKP_int32_MAX >> 6;
    for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
        min_gain_Q16 = SKP_min( min_gain_Q16, psEncCtrl->Gains_Q16[ i ] );
    }
    for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
        /* Divide to Q16 */
        SKP_assert( psEncCtrl->Gains_Q16[ i ] > 0 );
        /* Invert and normalize gains, and ensure that maximum invGains_Q16 is within range of a 16 bit int */
        invGains_Q16[ i ] = silk_DIV32_varQ( min_gain_Q16, psEncCtrl->Gains_Q16[ i ], 16 - 2 );

        /* Ensure Wght_Q15 a minimum value 1 */
        invGains_Q16[ i ] = SKP_max( invGains_Q16[ i ], 363 ); 
        
        /* Square the inverted gains */
        SKP_assert( invGains_Q16[ i ] == SKP_SAT16( invGains_Q16[ i ] ) );
        tmp = SKP_SMULWB( invGains_Q16[ i ], invGains_Q16[ i ] );
        Wght_Q15[ i ] = SKP_RSHIFT( tmp, 1 );

        /* Invert the inverted and normalized gains */
        local_gains[ i ] = SKP_DIV32( ( 1 << 16 ), invGains_Q16[ i ] );
    }

    if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
        /**********/
        /* VOICED */
        /**********/
        SKP_assert( psEnc->sCmn.ltp_mem_length - psEnc->sCmn.predictLPCOrder >= psEncCtrl->pitchL[ 0 ] + LTP_ORDER / 2 );

        /* LTP analysis */
        silk_find_LTP_FIX( psEncCtrl->LTPCoef_Q14, WLTP, &psEncCtrl->LTPredCodGain_Q7, 
            res_pitch, psEncCtrl->pitchL, Wght_Q15, psEnc->sCmn.subfr_length, 
            psEnc->sCmn.nb_subfr, psEnc->sCmn.ltp_mem_length, LTP_corrs_rshift );

        /* Quantize LTP gain parameters */
        silk_quant_LTP_gains( psEncCtrl->LTPCoef_Q14, psEnc->sCmn.indices.LTPIndex, &psEnc->sCmn.indices.PERIndex, 
            WLTP, psEnc->sCmn.mu_LTP_Q9, psEnc->sCmn.LTPQuantLowComplexity, psEnc->sCmn.nb_subfr);

        /* Control LTP scaling */
        silk_LTP_scale_ctrl_FIX( psEnc, psEncCtrl );

        /* Create LTP residual */
        silk_LTP_analysis_filter_FIX( LPC_in_pre, x - psEnc->sCmn.predictLPCOrder, psEncCtrl->LTPCoef_Q14, 
            psEncCtrl->pitchL, invGains_Q16, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );

    } else {
        /************/
        /* UNVOICED */
        /************/
        /* Create signal with prepended subframes, scaled by inverse gains */
        x_ptr     = x - psEnc->sCmn.predictLPCOrder;
        x_pre_ptr = LPC_in_pre;
        for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
            silk_scale_copy_vector16( x_pre_ptr, x_ptr, invGains_Q16[ i ], 
                psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder );
            x_pre_ptr += psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder;
            x_ptr     += psEnc->sCmn.subfr_length;
        }

        SKP_memset( psEncCtrl->LTPCoef_Q14, 0, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( opus_int16 ) );
        psEncCtrl->LTPredCodGain_Q7 = 0;
    }

    /* LPC_in_pre contains the LTP-filtered input for voiced, and the unfiltered input for unvoiced */
    TIC(FIND_LPC)
    silk_find_LPC_FIX( NLSF_Q15, &psEnc->sCmn.indices.NLSFInterpCoef_Q2, psEnc->sCmn.prev_NLSFq_Q15, 
        psEnc->sCmn.useInterpolatedNLSFs, psEnc->sCmn.first_frame_after_reset, psEnc->sCmn.predictLPCOrder, 
        LPC_in_pre, psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder, psEnc->sCmn.nb_subfr );
    TOC(FIND_LPC)

    /* Quantize LSFs */
    TIC(PROCESS_LSFS)
    silk_process_NLSFs( &psEnc->sCmn, psEncCtrl->PredCoef_Q12, NLSF_Q15, psEnc->sCmn.prev_NLSFq_Q15 );
    TOC(PROCESS_LSFS)

    /* Calculate residual energy using quantized LPC coefficients */
    silk_residual_energy_FIX( psEncCtrl->ResNrg, psEncCtrl->ResNrgQ, LPC_in_pre, psEncCtrl->PredCoef_Q12, local_gains,
        psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );

    /* Copy to prediction struct for use in next frame for fluctuation reduction */
    SKP_memcpy( psEnc->sCmn.prev_NLSFq_Q15, NLSF_Q15, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) );
}