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      2 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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     11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
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     13 products derived from this software without specific prior written
     14 permission.
     15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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     24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     25 POSSIBILITY OF SUCH DAMAGE.
     26 ***********************************************************************/
     27 
     28 #ifdef HAVE_CONFIG_H
     29 #include "config.h"
     30 #endif
     31 
     32 #include "main_FLP.h"
     33 
     34 /* Find LPC and LTP coefficients */
     35 void silk_find_pred_coefs_FLP(
     36     silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
     37     silk_encoder_control_FLP        *psEncCtrl,                         /* I/O  Encoder control FLP                         */
     38     const silk_float                res_pitch[],                        /* I    Residual from pitch analysis                */
     39     const silk_float                x[],                                /* I    Speech signal                               */
     40     opus_int                        condCoding                          /* I    The type of conditional coding to use       */
     41 )
     42 {
     43     opus_int         i;
     44     silk_float       WLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ];
     45     silk_float       invGains[ MAX_NB_SUBFR ], Wght[ MAX_NB_SUBFR ];
     46     opus_int16       NLSF_Q15[ MAX_LPC_ORDER ];
     47     const silk_float *x_ptr;
     48     silk_float       *x_pre_ptr, LPC_in_pre[ MAX_NB_SUBFR * MAX_LPC_ORDER + MAX_FRAME_LENGTH ];
     49     silk_float       minInvGain;
     50 
     51     /* Weighting for weighted least squares */
     52     for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
     53         silk_assert( psEncCtrl->Gains[ i ] > 0.0f );
     54         invGains[ i ] = 1.0f / psEncCtrl->Gains[ i ];
     55         Wght[ i ]     = invGains[ i ] * invGains[ i ];
     56     }
     57 
     58     if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
     59         /**********/
     60         /* VOICED */
     61         /**********/
     62         silk_assert( psEnc->sCmn.ltp_mem_length - psEnc->sCmn.predictLPCOrder >= psEncCtrl->pitchL[ 0 ] + LTP_ORDER / 2 );
     63 
     64         /* LTP analysis */
     65         silk_find_LTP_FLP( psEncCtrl->LTPCoef, WLTP, &psEncCtrl->LTPredCodGain, res_pitch,
     66             psEncCtrl->pitchL, Wght, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.ltp_mem_length );
     67 
     68         /* Quantize LTP gain parameters */
     69         silk_quant_LTP_gains_FLP( psEncCtrl->LTPCoef, psEnc->sCmn.indices.LTPIndex, &psEnc->sCmn.indices.PERIndex,
     70             &psEnc->sCmn.sum_log_gain_Q7, WLTP, psEnc->sCmn.mu_LTP_Q9, psEnc->sCmn.LTPQuantLowComplexity, psEnc->sCmn.nb_subfr );
     71 
     72         /* Control LTP scaling */
     73         silk_LTP_scale_ctrl_FLP( psEnc, psEncCtrl, condCoding );
     74 
     75         /* Create LTP residual */
     76         silk_LTP_analysis_filter_FLP( LPC_in_pre, x - psEnc->sCmn.predictLPCOrder, psEncCtrl->LTPCoef,
     77             psEncCtrl->pitchL, invGains, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );
     78     } else {
     79         /************/
     80         /* UNVOICED */
     81         /************/
     82         /* Create signal with prepended subframes, scaled by inverse gains */
     83         x_ptr     = x - psEnc->sCmn.predictLPCOrder;
     84         x_pre_ptr = LPC_in_pre;
     85         for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
     86             silk_scale_copy_vector_FLP( x_pre_ptr, x_ptr, invGains[ i ],
     87                 psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder );
     88             x_pre_ptr += psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder;
     89             x_ptr     += psEnc->sCmn.subfr_length;
     90         }
     91         silk_memset( psEncCtrl->LTPCoef, 0, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( silk_float ) );
     92         psEncCtrl->LTPredCodGain = 0.0f;
     93 		psEnc->sCmn.sum_log_gain_Q7 = 0;
     94     }
     95 
     96     /* Limit on total predictive coding gain */
     97     if( psEnc->sCmn.first_frame_after_reset ) {
     98         minInvGain = 1.0f / MAX_PREDICTION_POWER_GAIN_AFTER_RESET;
     99     } else {
    100         minInvGain = (silk_float)pow( 2, psEncCtrl->LTPredCodGain / 3 ) /  MAX_PREDICTION_POWER_GAIN;
    101         minInvGain /= 0.25f + 0.75f * psEncCtrl->coding_quality;
    102     }
    103 
    104     /* LPC_in_pre contains the LTP-filtered input for voiced, and the unfiltered input for unvoiced */
    105     silk_find_LPC_FLP( &psEnc->sCmn, NLSF_Q15, LPC_in_pre, minInvGain );
    106 
    107     /* Quantize LSFs */
    108     silk_process_NLSFs_FLP( &psEnc->sCmn, psEncCtrl->PredCoef, NLSF_Q15, psEnc->sCmn.prev_NLSFq_Q15 );
    109 
    110     /* Calculate residual energy using quantized LPC coefficients */
    111     silk_residual_energy_FLP( psEncCtrl->ResNrg, LPC_in_pre, psEncCtrl->PredCoef, psEncCtrl->Gains,
    112         psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );
    113 
    114     /* Copy to prediction struct for use in next frame for interpolation */
    115     silk_memcpy( psEnc->sCmn.prev_NLSFq_Q15, NLSF_Q15, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) );
    116 }
    117 
    118