/*********************************************************************** Copyright (c) 2006-2011, 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 "SKP_Silk_main_FIX.h" /* Limit, stabilize, convert and quantize NLSFs. */ void SKP_Silk_process_NLSFs_FIX( SKP_Silk_encoder_state_FIX *psEnc, /* I/O Encoder state FIX */ SKP_Silk_encoder_control_FIX *psEncCtrl, /* I/O Encoder control FIX */ SKP_int *pNLSF_Q15 /* I/O Normalized LSFs (quant out) (0 - (2^15-1)) */ ) { SKP_int doInterpolate; SKP_int pNLSFW_Q6[ MAX_LPC_ORDER ]; SKP_int NLSF_mu_Q15, NLSF_mu_fluc_red_Q16; SKP_int32 i_sqr_Q15; const SKP_Silk_NLSF_CB_struct *psNLSF_CB; /* Used only for NLSF interpolation */ SKP_int pNLSF0_temp_Q15[ MAX_LPC_ORDER ]; SKP_int pNLSFW0_temp_Q6[ MAX_LPC_ORDER ]; SKP_int i; SKP_assert( psEnc->speech_activity_Q8 >= 0 ); SKP_assert( psEnc->speech_activity_Q8 <= 256 ); SKP_assert( psEncCtrl->sparseness_Q8 >= 0 ); SKP_assert( psEncCtrl->sparseness_Q8 <= 256 ); SKP_assert( psEncCtrl->sCmn.sigtype == SIG_TYPE_VOICED || psEncCtrl->sCmn.sigtype == SIG_TYPE_UNVOICED ); /***********************/ /* Calculate mu values */ /***********************/ if( psEncCtrl->sCmn.sigtype == SIG_TYPE_VOICED ) { /* NLSF_mu = 0.002f - 0.001f * psEnc->speech_activity; */ /* NLSF_mu_fluc_red = 0.1f - 0.05f * psEnc->speech_activity; */ NLSF_mu_Q15 = SKP_SMLAWB( 66, -8388, psEnc->speech_activity_Q8 ); NLSF_mu_fluc_red_Q16 = SKP_SMLAWB( 6554, -838848, psEnc->speech_activity_Q8 ); } else { /* NLSF_mu = 0.005f - 0.004f * psEnc->speech_activity; */ /* NLSF_mu_fluc_red = 0.2f - 0.1f * psEnc->speech_activity - 0.1f * psEncCtrl->sparseness; */ NLSF_mu_Q15 = SKP_SMLAWB( 164, -33554, psEnc->speech_activity_Q8 ); NLSF_mu_fluc_red_Q16 = SKP_SMLAWB( 13107, -1677696, psEnc->speech_activity_Q8 + psEncCtrl->sparseness_Q8 ); } SKP_assert( NLSF_mu_Q15 >= 0 ); SKP_assert( NLSF_mu_Q15 <= 164 ); SKP_assert( NLSF_mu_fluc_red_Q16 >= 0 ); SKP_assert( NLSF_mu_fluc_red_Q16 <= 13107 ); NLSF_mu_Q15 = SKP_max( NLSF_mu_Q15, 1 ); /* Calculate NLSF weights */ TIC(NLSF_weights_FIX) SKP_Silk_NLSF_VQ_weights_laroia( pNLSFW_Q6, pNLSF_Q15, psEnc->sCmn.predictLPCOrder ); TOC(NLSF_weights_FIX) /* 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 */ SKP_Silk_interpolate( pNLSF0_temp_Q15, psEnc->sPred.prev_NLSFq_Q15, pNLSF_Q15, psEncCtrl->sCmn.NLSFInterpCoef_Q2, psEnc->sCmn.predictLPCOrder ); /* Calculate first half NLSF weights for the interpolated NLSFs */ TIC(NLSF_weights_FIX) SKP_Silk_NLSF_VQ_weights_laroia( pNLSFW0_temp_Q6, pNLSF0_temp_Q15, psEnc->sCmn.predictLPCOrder ); TOC(NLSF_weights_FIX) /* Update NLSF weights with contribution from first half */ i_sqr_Q15 = SKP_LSHIFT( SKP_SMULBB( psEncCtrl->sCmn.NLSFInterpCoef_Q2, psEncCtrl->sCmn.NLSFInterpCoef_Q2 ), 11 ); for( i = 0; i < psEnc->sCmn.predictLPCOrder; i++ ) { pNLSFW_Q6[ i ] = SKP_SMLAWB( SKP_RSHIFT( pNLSFW_Q6[ i ], 1 ), pNLSFW0_temp_Q6[ i ], i_sqr_Q15 ); SKP_assert( pNLSFW_Q6[ i ] <= SKP_int16_MAX ); SKP_assert( pNLSFW_Q6[ i ] >= 1 ); } } /* Set pointer to the NLSF codebook for the current signal type and LPC order */ psNLSF_CB = psEnc->sCmn.psNLSF_CB[ psEncCtrl->sCmn.sigtype ]; /* Quantize NLSF parameters given the trained NLSF codebooks */ TIC(MSVQ_encode_FIX) SKP_Silk_NLSF_MSVQ_encode_FIX( psEncCtrl->sCmn.NLSFIndices, pNLSF_Q15, psNLSF_CB, psEnc->sPred.prev_NLSFq_Q15, pNLSFW_Q6, NLSF_mu_Q15, NLSF_mu_fluc_red_Q16, psEnc->sCmn.NLSF_MSVQ_Survivors, psEnc->sCmn.predictLPCOrder, psEnc->sCmn.first_frame_after_reset ); TOC(MSVQ_encode_FIX) /* Convert quantized NLSFs back to LPC coefficients */ SKP_Silk_NLSF2A_stable( psEncCtrl->PredCoef_Q12[ 1 ], pNLSF_Q15, psEnc->sCmn.predictLPCOrder ); if( doInterpolate ) { /* Calculate the interpolated, quantized LSF vector for the first half */ SKP_Silk_interpolate( pNLSF0_temp_Q15, psEnc->sPred.prev_NLSFq_Q15, pNLSF_Q15, psEncCtrl->sCmn.NLSFInterpCoef_Q2, psEnc->sCmn.predictLPCOrder ); /* Convert back to LPC coefficients */ SKP_Silk_NLSF2A_stable( psEncCtrl->PredCoef_Q12[ 0 ], pNLSF0_temp_Q15, psEnc->sCmn.predictLPCOrder ); } else { /* Copy LPC coefficients for first half from second half */ SKP_memcpy( psEncCtrl->PredCoef_Q12[ 0 ], psEncCtrl->PredCoef_Q12[ 1 ], psEnc->sCmn.predictLPCOrder * sizeof( SKP_int16 ) ); } }