C++ (Cpp) silk_NLSF_residual_dequant Examples

Example #1

File: NLSF_decode.c Project: Appsgeyser/Custom-messenger

void silk_NLSF_decode(
          opus_int16            *pNLSF_Q15,                     /* O    Quantized NLSF vector [ LPC_ORDER ]         */
          opus_int8             *NLSFIndices,                   /* I    Codebook path vector [ LPC_ORDER + 1 ]      */
    const silk_NLSF_CB_struct   *psNLSF_CB                      /* I    Codebook object                             */
)
{
    opus_int         i;
    opus_uint8       pred_Q8[  MAX_LPC_ORDER ];
    opus_int16       ec_ix[    MAX_LPC_ORDER ];
    opus_int16       res_Q10[  MAX_LPC_ORDER ];
    opus_int32       NLSF_Q15_tmp;
    const opus_uint8 *pCB_element;
    const opus_int16 *pCB_Wght_Q9;

    /* Unpack entropy table indices and predictor for current CB1 index */
    silk_NLSF_unpack( ec_ix, pred_Q8, psNLSF_CB, NLSFIndices[ 0 ] );

    /* Predictive residual dequantizer */
    silk_NLSF_residual_dequant( res_Q10, &NLSFIndices[ 1 ], pred_Q8, psNLSF_CB->quantStepSize_Q16, psNLSF_CB->order );

    /* Apply inverse square-rooted weights to first stage and add to output */
    pCB_element = &psNLSF_CB->CB1_NLSF_Q8[ NLSFIndices[ 0 ] * psNLSF_CB->order ];
    pCB_Wght_Q9 = &psNLSF_CB->CB1_Wght_Q9[ NLSFIndices[ 0 ] * psNLSF_CB->order ];
    for( i = 0; i < psNLSF_CB->order; i++ ) {
        NLSF_Q15_tmp = silk_ADD_LSHIFT32( silk_DIV32_16( silk_LSHIFT( (opus_int32)res_Q10[ i ], 14 ), pCB_Wght_Q9[ i ] ), (opus_int16)pCB_element[ i ], 7 );
        pNLSF_Q15[ i ] = (opus_int16)silk_LIMIT( NLSF_Q15_tmp, 0, 32767 );
    }

    /* NLSF stabilization */
    silk_NLSF_stabilize( pNLSF_Q15, psNLSF_CB->deltaMin_Q15, psNLSF_CB->order );
}

Example #2

File: NLSF_decode.c Project: venkatarajasekhar/Qt

void silk_NLSF_decode(
    opus_int16            *pNLSF_Q15,                     /* O    Quantized NLSF vector [ LPC_ORDER ]         */
    opus_int8             *NLSFIndices,                   /* I    Codebook path vector [ LPC_ORDER + 1 ]      */
    const silk_NLSF_CB_struct   *psNLSF_CB                      /* I    Codebook object                             */
)
{
    opus_int         i;
    opus_uint8       pred_Q8[  MAX_LPC_ORDER ];
    opus_int16       ec_ix[    MAX_LPC_ORDER ];
    opus_int16       res_Q10[  MAX_LPC_ORDER ];
    opus_int16       W_tmp_QW[ MAX_LPC_ORDER ];
    opus_int32       W_tmp_Q9, NLSF_Q15_tmp;
    const opus_uint8 *pCB_element;

    /* Decode first stage */
    pCB_element = &psNLSF_CB->CB1_NLSF_Q8[ NLSFIndices[ 0 ] * psNLSF_CB->order ];
    for( i = 0; i < psNLSF_CB->order; i++ ) {
        pNLSF_Q15[ i ] = silk_LSHIFT( (opus_int16)pCB_element[ i ], 7 );
    }

    /* Unpack entropy table indices and predictor for current CB1 index */
    silk_NLSF_unpack( ec_ix, pred_Q8, psNLSF_CB, NLSFIndices[ 0 ] );

    /* Predictive residual dequantizer */
    silk_NLSF_residual_dequant( res_Q10, &NLSFIndices[ 1 ], pred_Q8, psNLSF_CB->quantStepSize_Q16, psNLSF_CB->order );

    /* Weights from codebook vector */
    silk_NLSF_VQ_weights_laroia( W_tmp_QW, pNLSF_Q15, psNLSF_CB->order );

    /* Apply inverse square-rooted weights and add to output */
    for( i = 0; i < psNLSF_CB->order; i++ ) {
        W_tmp_Q9 = silk_SQRT_APPROX( silk_LSHIFT( (opus_int32)W_tmp_QW[ i ], 18 - NLSF_W_Q ) );
        NLSF_Q15_tmp = silk_ADD32( pNLSF_Q15[ i ], silk_DIV32_16( silk_LSHIFT( (opus_int32)res_Q10[ i ], 14 ), W_tmp_Q9 ) );
        pNLSF_Q15[ i ] = (opus_int16)silk_LIMIT( NLSF_Q15_tmp, 0, 32767 );
    }

    /* NLSF stabilization */
    silk_NLSF_stabilize( pNLSF_Q15, psNLSF_CB->deltaMin_Q15, psNLSF_CB->order );
}