Line data    Source code

       1             : /***********************************************************************
       2             : Copyright (c) 2006-2011, Skype Limited. All rights reserved.
       3             : Redistribution and use in source and binary forms, with or without
       4             : modification, are permitted provided that the following conditions
       5             : are met:
       6             : - Redistributions of source code must retain the above copyright notice,
       7             : this list of conditions and the following disclaimer.
       8             : - Redistributions in binary form must reproduce the above copyright
       9             : notice, this list of conditions and the following disclaimer in the
      10             : documentation and/or other materials provided with the distribution.
      11             : - Neither the name of Internet Society, IETF or IETF Trust, nor the
      12             : names of specific contributors, may be used to endorse or promote
      13             : products derived from this software without specific prior written
      14             : permission.
      15             : THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
      16             : AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      17             : IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      18             : ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
      19             : LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
      20             : CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
      21             : SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
      22             : INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
      23             : CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
      24             : ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
      25             : POSSIBILITY OF SUCH DAMAGE.
      26             : ***********************************************************************/
      27             : 
      28             : #ifdef HAVE_CONFIG_H
      29             : #include "config.h"
      30             : #endif
      31             : 
      32             : #include "main.h"
      33             : 
      34             : /* Limit, stabilize, convert and quantize NLSFs */
      35           0 : void silk_process_NLSFs(
      36             :     silk_encoder_state          *psEncC,                            /* I/O  Encoder state                               */
      37             :     opus_int16                  PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ], /* O    Prediction coefficients                     */
      38             :     opus_int16                  pNLSF_Q15[         MAX_LPC_ORDER ], /* I/O  Normalized LSFs (quant out) (0 - (2^15-1))  */
      39             :     const opus_int16            prev_NLSFq_Q15[    MAX_LPC_ORDER ]  /* I    Previous Normalized LSFs (0 - (2^15-1))     */
      40             : )
      41             : {
      42             :     opus_int     i, doInterpolate;
      43             :     opus_int     NLSF_mu_Q20;
      44             :     opus_int16   i_sqr_Q15;
      45             :     opus_int16   pNLSF0_temp_Q15[ MAX_LPC_ORDER ];
      46             :     opus_int16   pNLSFW_QW[ MAX_LPC_ORDER ];
      47             :     opus_int16   pNLSFW0_temp_QW[ MAX_LPC_ORDER ];
      48             : 
      49           0 :     silk_assert( psEncC->speech_activity_Q8 >=   0 );
      50           0 :     silk_assert( psEncC->speech_activity_Q8 <= SILK_FIX_CONST( 1.0, 8 ) );
      51           0 :     silk_assert( psEncC->useInterpolatedNLSFs == 1 || psEncC->indices.NLSFInterpCoef_Q2 == ( 1 << 2 ) );
      52             : 
      53             :     /***********************/
      54             :     /* Calculate mu values */
      55             :     /***********************/
      56             :     /* NLSF_mu  = 0.003 - 0.0015 * psEnc->speech_activity; */
      57           0 :     NLSF_mu_Q20 = silk_SMLAWB( SILK_FIX_CONST( 0.003, 20 ), SILK_FIX_CONST( -0.001, 28 ), psEncC->speech_activity_Q8 );
      58           0 :     if( psEncC->nb_subfr == 2 ) {
      59             :         /* Multiply by 1.5 for 10 ms packets */
      60           0 :         NLSF_mu_Q20 = silk_ADD_RSHIFT( NLSF_mu_Q20, NLSF_mu_Q20, 1 );
      61             :     }
      62             : 
      63           0 :     silk_assert( NLSF_mu_Q20 >  0 );
      64           0 :     silk_assert( NLSF_mu_Q20 <= SILK_FIX_CONST( 0.005, 20 ) );
      65             : 
      66             :     /* Calculate NLSF weights */
      67           0 :     silk_NLSF_VQ_weights_laroia( pNLSFW_QW, pNLSF_Q15, psEncC->predictLPCOrder );
      68             : 
      69             :     /* Update NLSF weights for interpolated NLSFs */
      70           0 :     doInterpolate = ( psEncC->useInterpolatedNLSFs == 1 ) && ( psEncC->indices.NLSFInterpCoef_Q2 < 4 );
      71           0 :     if( doInterpolate ) {
      72             :         /* Calculate the interpolated NLSF vector for the first half */
      73           0 :         silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15,
      74           0 :             psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder );
      75             : 
      76             :         /* Calculate first half NLSF weights for the interpolated NLSFs */
      77           0 :         silk_NLSF_VQ_weights_laroia( pNLSFW0_temp_QW, pNLSF0_temp_Q15, psEncC->predictLPCOrder );
      78             : 
      79             :         /* Update NLSF weights with contribution from first half */
      80           0 :         i_sqr_Q15 = silk_LSHIFT( silk_SMULBB( psEncC->indices.NLSFInterpCoef_Q2, psEncC->indices.NLSFInterpCoef_Q2 ), 11 );
      81           0 :         for( i = 0; i < psEncC->predictLPCOrder; i++ ) {
      82           0 :             pNLSFW_QW[ i ] = silk_ADD16( silk_RSHIFT( pNLSFW_QW[ i ], 1 ), silk_RSHIFT(
      83             :                   silk_SMULBB( pNLSFW0_temp_QW[ i ], i_sqr_Q15 ), 16) );
      84           0 :             silk_assert( pNLSFW_QW[ i ] >= 1 );
      85             :         }
      86             :     }
      87             : 
      88           0 :     silk_NLSF_encode( psEncC->indices.NLSFIndices, pNLSF_Q15, psEncC->psNLSF_CB, pNLSFW_QW,
      89           0 :         NLSF_mu_Q20, psEncC->NLSF_MSVQ_Survivors, psEncC->indices.signalType );
      90             : 
      91             :     /* Convert quantized NLSFs back to LPC coefficients */
      92           0 :     silk_NLSF2A( PredCoef_Q12[ 1 ], pNLSF_Q15, psEncC->predictLPCOrder, psEncC->arch );
      93             : 
      94           0 :     if( doInterpolate ) {
      95             :         /* Calculate the interpolated, quantized LSF vector for the first half */
      96           0 :         silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15,
      97           0 :             psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder );
      98             : 
      99             :         /* Convert back to LPC coefficients */
     100           0 :         silk_NLSF2A( PredCoef_Q12[ 0 ], pNLSF0_temp_Q15, psEncC->predictLPCOrder, psEncC->arch );
     101             : 
     102             :     } else {
     103             :         /* Copy LPC coefficients for first half from second half */
     104           0 :         silk_assert( psEncC->predictLPCOrder <= MAX_LPC_ORDER );
     105           0 :         silk_memcpy( PredCoef_Q12[ 0 ], PredCoef_Q12[ 1 ], psEncC->predictLPCOrder * sizeof( opus_int16 ) );
     106             :     }
     107           0 : }