128 lines
6.6 KiB
C
128 lines
6.6 KiB
C
/***********************************************************************
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Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, (subject to the limitations in the disclaimer below)
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are permitted provided that the following conditions are met:
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- Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Skype Limited, nor the names of specific
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contributors, may be used to endorse or promote products derived from
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this software without specific prior written permission.
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NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
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BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
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BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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#include "SKP_Silk_main_FIX.h"
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/* Limit, stabilize, convert and quantize NLSFs. */
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void SKP_Silk_process_NLSFs_FIX(
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SKP_Silk_encoder_state_FIX *psEnc, /* I/O Encoder state FIX */
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SKP_Silk_encoder_control_FIX *psEncCtrl, /* I/O Encoder control FIX */
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SKP_int *pNLSF_Q15 /* I/O Normalized LSFs (quant out) (0 - (2^15-1)) */
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)
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{
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SKP_int doInterpolate;
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SKP_int pNLSFW_Q6[ MAX_LPC_ORDER ];
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SKP_int NLSF_mu_Q15, NLSF_mu_fluc_red_Q16;
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SKP_int32 i_sqr_Q15;
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const SKP_Silk_NLSF_CB_struct *psNLSF_CB;
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/* Used only for NLSF interpolation */
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SKP_int pNLSF0_temp_Q15[ MAX_LPC_ORDER ];
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SKP_int pNLSFW0_temp_Q6[ MAX_LPC_ORDER ];
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SKP_int i;
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SKP_assert( psEnc->speech_activity_Q8 >= 0 );
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SKP_assert( psEnc->speech_activity_Q8 <= 256 );
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SKP_assert( psEncCtrl->sparseness_Q8 >= 0 );
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SKP_assert( psEncCtrl->sparseness_Q8 <= 256 );
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SKP_assert( psEncCtrl->sCmn.sigtype == SIG_TYPE_VOICED || psEncCtrl->sCmn.sigtype == SIG_TYPE_UNVOICED );
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/***********************/
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/* Calculate mu values */
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/***********************/
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if( psEncCtrl->sCmn.sigtype == SIG_TYPE_VOICED ) {
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/* NLSF_mu = 0.002f - 0.001f * psEnc->speech_activity; */
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/* NLSF_mu_fluc_red = 0.1f - 0.05f * psEnc->speech_activity; */
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NLSF_mu_Q15 = SKP_SMLAWB( 66, -8388, psEnc->speech_activity_Q8 );
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NLSF_mu_fluc_red_Q16 = SKP_SMLAWB( 6554, -838848, psEnc->speech_activity_Q8 );
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} else {
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/* NLSF_mu = 0.005f - 0.004f * psEnc->speech_activity; */
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/* NLSF_mu_fluc_red = 0.2f - 0.1f * psEnc->speech_activity - 0.1f * psEncCtrl->sparseness; */
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NLSF_mu_Q15 = SKP_SMLAWB( 164, -33554, psEnc->speech_activity_Q8 );
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NLSF_mu_fluc_red_Q16 = SKP_SMLAWB( 13107, -1677696, psEnc->speech_activity_Q8 + psEncCtrl->sparseness_Q8 );
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}
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SKP_assert( NLSF_mu_Q15 >= 0 );
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SKP_assert( NLSF_mu_Q15 <= 164 );
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SKP_assert( NLSF_mu_fluc_red_Q16 >= 0 );
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SKP_assert( NLSF_mu_fluc_red_Q16 <= 13107 );
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NLSF_mu_Q15 = SKP_max( NLSF_mu_Q15, 1 );
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/* Calculate NLSF weights */
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TIC(NLSF_weights_FIX)
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SKP_Silk_NLSF_VQ_weights_laroia( pNLSFW_Q6, pNLSF_Q15, psEnc->sCmn.predictLPCOrder );
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TOC(NLSF_weights_FIX)
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/* Update NLSF weights for interpolated NLSFs */
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doInterpolate = ( psEnc->sCmn.useInterpolatedNLSFs == 1 ) && ( psEncCtrl->sCmn.NLSFInterpCoef_Q2 < ( 1 << 2 ) );
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if( doInterpolate ) {
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/* Calculate the interpolated NLSF vector for the first half */
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SKP_Silk_interpolate( pNLSF0_temp_Q15, psEnc->sPred.prev_NLSFq_Q15, pNLSF_Q15,
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psEncCtrl->sCmn.NLSFInterpCoef_Q2, psEnc->sCmn.predictLPCOrder );
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/* Calculate first half NLSF weights for the interpolated NLSFs */
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TIC(NLSF_weights_FIX)
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SKP_Silk_NLSF_VQ_weights_laroia( pNLSFW0_temp_Q6, pNLSF0_temp_Q15, psEnc->sCmn.predictLPCOrder );
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TOC(NLSF_weights_FIX)
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/* Update NLSF weights with contribution from first half */
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i_sqr_Q15 = SKP_LSHIFT( SKP_SMULBB( psEncCtrl->sCmn.NLSFInterpCoef_Q2, psEncCtrl->sCmn.NLSFInterpCoef_Q2 ), 11 );
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for( i = 0; i < psEnc->sCmn.predictLPCOrder; i++ ) {
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pNLSFW_Q6[ i ] = SKP_SMLAWB( SKP_RSHIFT( pNLSFW_Q6[ i ], 1 ), pNLSFW0_temp_Q6[ i ], i_sqr_Q15 );
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SKP_assert( pNLSFW_Q6[ i ] <= SKP_int16_MAX );
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SKP_assert( pNLSFW_Q6[ i ] >= 1 );
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}
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}
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/* Set pointer to the NLSF codebook for the current signal type and LPC order */
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psNLSF_CB = psEnc->sCmn.psNLSF_CB[ psEncCtrl->sCmn.sigtype ];
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/* Quantize NLSF parameters given the trained NLSF codebooks */
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TIC(MSVQ_encode_FIX)
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SKP_Silk_NLSF_MSVQ_encode_FIX( psEncCtrl->sCmn.NLSFIndices, pNLSF_Q15, psNLSF_CB,
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psEnc->sPred.prev_NLSFq_Q15, pNLSFW_Q6, NLSF_mu_Q15, NLSF_mu_fluc_red_Q16,
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psEnc->sCmn.NLSF_MSVQ_Survivors, psEnc->sCmn.predictLPCOrder, psEnc->sCmn.first_frame_after_reset );
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TOC(MSVQ_encode_FIX)
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/* Convert quantized NLSFs back to LPC coefficients */
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SKP_Silk_NLSF2A_stable( psEncCtrl->PredCoef_Q12[ 1 ], pNLSF_Q15, psEnc->sCmn.predictLPCOrder );
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if( doInterpolate ) {
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/* Calculate the interpolated, quantized LSF vector for the first half */
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SKP_Silk_interpolate( pNLSF0_temp_Q15, psEnc->sPred.prev_NLSFq_Q15, pNLSF_Q15,
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psEncCtrl->sCmn.NLSFInterpCoef_Q2, psEnc->sCmn.predictLPCOrder );
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/* Convert back to LPC coefficients */
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SKP_Silk_NLSF2A_stable( psEncCtrl->PredCoef_Q12[ 0 ], pNLSF0_temp_Q15, psEnc->sCmn.predictLPCOrder );
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} else {
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/* Copy LPC coefficients for first half from second half */
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SKP_memcpy( psEncCtrl->PredCoef_Q12[ 0 ], psEncCtrl->PredCoef_Q12[ 1 ], psEnc->sCmn.predictLPCOrder * sizeof( SKP_int16 ) );
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}
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}
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