ref: 111b23f648a45d3a034050e579a531d0592dc720
dir: /src_FLP/SKP_Silk_process_NLSFs_FLP.c/
/***********************************************************************
Copyright (c) 2006-2010, Skype Limited. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, (subject to the limitations in the disclaimer below)
are permitted provided that the following conditions are met:
- Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
- Neither the name of Skype Limited, nor the names of specific
contributors, may be used to endorse or promote products derived from
this software without specific prior written permission.
NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
***********************************************************************/
#include <stdlib.h>
#include "SKP_Silk_main_FLP.h"
/* Limit, stabilize, convert and quantize NLSFs */
void SKP_Silk_process_NLSFs_FLP(
SKP_Silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
SKP_Silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
SKP_float *pNLSF /* I/O NLSFs (quantized output) */
)
{
SKP_int doInterpolate;
SKP_float pNLSFW[ MAX_LPC_ORDER ];
SKP_float NLSF_mu, NLSF_mu_fluc_red, i_sqr, NLSF_interpolation_factor = 0.0f;
const SKP_Silk_NLSF_CB_struct *psNLSF_CB;
/* Used only for NLSF interpolation */
SKP_float pNLSF0_temp[ MAX_LPC_ORDER ];
SKP_float pNLSFW0_temp[ MAX_LPC_ORDER ];
SKP_int i;
/***********************/
/* Calculate mu values */
/***********************/
if( psEncCtrl->sCmn.signalType == TYPE_VOICED ) {
NLSF_mu = 0.002f - 0.001f * psEnc->speech_activity;
NLSF_mu_fluc_red = 0.1f - 0.05f * psEnc->speech_activity;
} else {
NLSF_mu = 0.005f - 0.004f * psEnc->speech_activity;
NLSF_mu_fluc_red = 0.2f - 0.1f * ( psEnc->speech_activity + psEncCtrl->sparseness );
}
/* Calculate NLSF weights */
SKP_Silk_NLSF_VQ_weights_laroia_FLP( pNLSFW, pNLSF, psEnc->sCmn.predictLPCOrder );
/* Update NLSF weights for interpolated NLSFs */
doInterpolate = ( psEnc->sCmn.useInterpolatedNLSFs == 1 ) && ( psEncCtrl->sCmn.NLSFInterpCoef_Q2 < ( 1 << 2 ) );
if( doInterpolate ) {
/* Calculate the interpolated NLSF vector for the first half */
NLSF_interpolation_factor = 0.25f * psEncCtrl->sCmn.NLSFInterpCoef_Q2;
SKP_Silk_interpolate_wrapper_FLP( pNLSF0_temp, psEnc->sPred.prev_NLSFq, pNLSF,
NLSF_interpolation_factor, psEnc->sCmn.predictLPCOrder );
/* Calculate first half NLSF weights for the interpolated NLSFs */
SKP_Silk_NLSF_VQ_weights_laroia_FLP( pNLSFW0_temp, pNLSF0_temp, psEnc->sCmn.predictLPCOrder );
/* Update NLSF weights with contribution from first half */
i_sqr = NLSF_interpolation_factor * NLSF_interpolation_factor;
for( i = 0; i < psEnc->sCmn.predictLPCOrder; i++ ) {
pNLSFW[ i ] = 0.5f * ( pNLSFW[ i ] + i_sqr * pNLSFW0_temp[ i ] );
}
}
/* Set pointer to the NLSF codebook for the current signal type and LPC order */
psNLSF_CB = psEnc->sCmn.psNLSF_CB[ 1 - (psEncCtrl->sCmn.signalType >> 1) ];
/* Quantize NLSF parameters given the trained NLSF codebooks */
SKP_Silk_NLSF_MSVQ_encode_FLP( psEncCtrl->sCmn.NLSFIndices, pNLSF, psNLSF_CB, psEnc->sPred.prev_NLSFq, pNLSFW, NLSF_mu,
NLSF_mu_fluc_red, psEnc->sCmn.NLSF_MSVQ_Survivors, psEnc->sCmn.predictLPCOrder, psEnc->sCmn.first_frame_after_reset );
/* Convert quantized NLSFs back to LPC coefficients */
SKP_Silk_NLSF2A_stable_FLP( psEncCtrl->PredCoef[ 1 ], pNLSF, psEnc->sCmn.predictLPCOrder );
if( doInterpolate ) {
/* Calculate the interpolated, quantized NLSF vector for the first half */
SKP_Silk_interpolate_wrapper_FLP( pNLSF0_temp, psEnc->sPred.prev_NLSFq, pNLSF,
NLSF_interpolation_factor, psEnc->sCmn.predictLPCOrder );
/* Convert back to LPC coefficients */
SKP_Silk_NLSF2A_stable_FLP( psEncCtrl->PredCoef[ 0 ], pNLSF0_temp, psEnc->sCmn.predictLPCOrder );
} else {
/* Copy LPC coefficients for first half from second half */
SKP_memcpy( psEncCtrl->PredCoef[ 0 ], psEncCtrl->PredCoef[ 1 ], psEnc->sCmn.predictLPCOrder * sizeof( SKP_float ) );
}
}