cannam@154: /***********************************************************************
cannam@154: Copyright (c) 2006-2011, Skype Limited. All rights reserved.
cannam@154: Redistribution and use in source and binary forms, with or without
cannam@154: modification, are permitted provided that the following conditions
cannam@154: are met:
cannam@154: - Redistributions of source code must retain the above copyright notice,
cannam@154: this list of conditions and the following disclaimer.
cannam@154: - Redistributions in binary form must reproduce the above copyright
cannam@154: notice, this list of conditions and the following disclaimer in the
cannam@154: documentation and/or other materials provided with the distribution.
cannam@154: - Neither the name of Internet Society, IETF or IETF Trust, nor the
cannam@154: names of specific contributors, may be used to endorse or promote
cannam@154: products derived from this software without specific prior written
cannam@154: permission.
cannam@154: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
cannam@154: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
cannam@154: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
cannam@154: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
cannam@154: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
cannam@154: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
cannam@154: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
cannam@154: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
cannam@154: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
cannam@154: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
cannam@154: POSSIBILITY OF SUCH DAMAGE.
cannam@154: ***********************************************************************/
cannam@154: 
cannam@154: #ifdef HAVE_CONFIG_H
cannam@154: #include "config.h"
cannam@154: #endif
cannam@154: 
cannam@154: #include "main.h"
cannam@154: 
cannam@154: /* Limit, stabilize, convert and quantize NLSFs */
cannam@154: void silk_process_NLSFs(
cannam@154:     silk_encoder_state          *psEncC,                            /* I/O  Encoder state                               */
cannam@154:     opus_int16                  PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ], /* O    Prediction coefficients                     */
cannam@154:     opus_int16                  pNLSF_Q15[         MAX_LPC_ORDER ], /* I/O  Normalized LSFs (quant out) (0 - (2^15-1))  */
cannam@154:     const opus_int16            prev_NLSFq_Q15[    MAX_LPC_ORDER ]  /* I    Previous Normalized LSFs (0 - (2^15-1))     */
cannam@154: )
cannam@154: {
cannam@154:     opus_int     i, doInterpolate;
cannam@154:     opus_int     NLSF_mu_Q20;
cannam@154:     opus_int16   i_sqr_Q15;
cannam@154:     opus_int16   pNLSF0_temp_Q15[ MAX_LPC_ORDER ];
cannam@154:     opus_int16   pNLSFW_QW[ MAX_LPC_ORDER ];
cannam@154:     opus_int16   pNLSFW0_temp_QW[ MAX_LPC_ORDER ];
cannam@154: 
cannam@154:     silk_assert( psEncC->speech_activity_Q8 >=   0 );
cannam@154:     silk_assert( psEncC->speech_activity_Q8 <= SILK_FIX_CONST( 1.0, 8 ) );
cannam@154:     celt_assert( psEncC->useInterpolatedNLSFs == 1 || psEncC->indices.NLSFInterpCoef_Q2 == ( 1 << 2 ) );
cannam@154: 
cannam@154:     /***********************/
cannam@154:     /* Calculate mu values */
cannam@154:     /***********************/
cannam@154:     /* NLSF_mu  = 0.003 - 0.0015 * psEnc->speech_activity; */
cannam@154:     NLSF_mu_Q20 = silk_SMLAWB( SILK_FIX_CONST( 0.003, 20 ), SILK_FIX_CONST( -0.001, 28 ), psEncC->speech_activity_Q8 );
cannam@154:     if( psEncC->nb_subfr == 2 ) {
cannam@154:         /* Multiply by 1.5 for 10 ms packets */
cannam@154:         NLSF_mu_Q20 = silk_ADD_RSHIFT( NLSF_mu_Q20, NLSF_mu_Q20, 1 );
cannam@154:     }
cannam@154: 
cannam@154:     celt_assert( NLSF_mu_Q20 >  0 );
cannam@154:     silk_assert( NLSF_mu_Q20 <= SILK_FIX_CONST( 0.005, 20 ) );
cannam@154: 
cannam@154:     /* Calculate NLSF weights */
cannam@154:     silk_NLSF_VQ_weights_laroia( pNLSFW_QW, pNLSF_Q15, psEncC->predictLPCOrder );
cannam@154: 
cannam@154:     /* Update NLSF weights for interpolated NLSFs */
cannam@154:     doInterpolate = ( psEncC->useInterpolatedNLSFs == 1 ) && ( psEncC->indices.NLSFInterpCoef_Q2 < 4 );
cannam@154:     if( doInterpolate ) {
cannam@154:         /* Calculate the interpolated NLSF vector for the first half */
cannam@154:         silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15,
cannam@154:             psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder );
cannam@154: 
cannam@154:         /* Calculate first half NLSF weights for the interpolated NLSFs */
cannam@154:         silk_NLSF_VQ_weights_laroia( pNLSFW0_temp_QW, pNLSF0_temp_Q15, psEncC->predictLPCOrder );
cannam@154: 
cannam@154:         /* Update NLSF weights with contribution from first half */
cannam@154:         i_sqr_Q15 = silk_LSHIFT( silk_SMULBB( psEncC->indices.NLSFInterpCoef_Q2, psEncC->indices.NLSFInterpCoef_Q2 ), 11 );
cannam@154:         for( i = 0; i < psEncC->predictLPCOrder; i++ ) {
cannam@154:             pNLSFW_QW[ i ] = silk_ADD16( silk_RSHIFT( pNLSFW_QW[ i ], 1 ), silk_RSHIFT(
cannam@154:                   silk_SMULBB( pNLSFW0_temp_QW[ i ], i_sqr_Q15 ), 16) );
cannam@154:             silk_assert( pNLSFW_QW[ i ] >= 1 );
cannam@154:         }
cannam@154:     }
cannam@154: 
cannam@154:     silk_NLSF_encode( psEncC->indices.NLSFIndices, pNLSF_Q15, psEncC->psNLSF_CB, pNLSFW_QW,
cannam@154:         NLSF_mu_Q20, psEncC->NLSF_MSVQ_Survivors, psEncC->indices.signalType );
cannam@154: 
cannam@154:     /* Convert quantized NLSFs back to LPC coefficients */
cannam@154:     silk_NLSF2A( PredCoef_Q12[ 1 ], pNLSF_Q15, psEncC->predictLPCOrder, psEncC->arch );
cannam@154: 
cannam@154:     if( doInterpolate ) {
cannam@154:         /* Calculate the interpolated, quantized LSF vector for the first half */
cannam@154:         silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15,
cannam@154:             psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder );
cannam@154: 
cannam@154:         /* Convert back to LPC coefficients */
cannam@154:         silk_NLSF2A( PredCoef_Q12[ 0 ], pNLSF0_temp_Q15, psEncC->predictLPCOrder, psEncC->arch );
cannam@154: 
cannam@154:     } else {
cannam@154:         /* Copy LPC coefficients for first half from second half */
cannam@154:         celt_assert( psEncC->predictLPCOrder <= MAX_LPC_ORDER );
cannam@154:         silk_memcpy( PredCoef_Q12[ 0 ], PredCoef_Q12[ 1 ], psEncC->predictLPCOrder * sizeof( opus_int16 ) );
cannam@154:     }
cannam@154: }