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             : /* Predictive dequantizer for NLSF residuals */
      35           0 : static OPUS_INLINE void silk_NLSF_residual_dequant(          /* O    Returns RD value in Q30                     */
      36             :           opus_int16         x_Q10[],                        /* O    Output [ order ]                            */
      37             :     const opus_int8          indices[],                      /* I    Quantization indices [ order ]              */
      38             :     const opus_uint8         pred_coef_Q8[],                 /* I    Backward predictor coefs [ order ]          */
      39             :     const opus_int           quant_step_size_Q16,            /* I    Quantization step size                      */
      40             :     const opus_int16         order                           /* I    Number of input values                      */
      41             : )
      42             : {
      43             :     opus_int     i, out_Q10, pred_Q10;
      44             : 
      45           0 :     out_Q10 = 0;
      46           0 :     for( i = order-1; i >= 0; i-- ) {
      47           0 :         pred_Q10 = silk_RSHIFT( silk_SMULBB( out_Q10, (opus_int16)pred_coef_Q8[ i ] ), 8 );
      48           0 :         out_Q10  = silk_LSHIFT( indices[ i ], 10 );
      49           0 :         if( out_Q10 > 0 ) {
      50           0 :             out_Q10 = silk_SUB16( out_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
      51           0 :         } else if( out_Q10 < 0 ) {
      52           0 :             out_Q10 = silk_ADD16( out_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
      53             :         }
      54           0 :         out_Q10  = silk_SMLAWB( pred_Q10, (opus_int32)out_Q10, quant_step_size_Q16 );
      55           0 :         x_Q10[ i ] = out_Q10;
      56             :     }
      57           0 : }
      58             : 
      59             : 
      60             : /***********************/
      61             : /* NLSF vector decoder */
      62             : /***********************/
      63           0 : void silk_NLSF_decode(
      64             :           opus_int16            *pNLSF_Q15,                     /* O    Quantized NLSF vector [ LPC_ORDER ]         */
      65             :           opus_int8             *NLSFIndices,                   /* I    Codebook path vector [ LPC_ORDER + 1 ]      */
      66             :     const silk_NLSF_CB_struct   *psNLSF_CB                      /* I    Codebook object                             */
      67             : )
      68             : {
      69             :     opus_int         i;
      70             :     opus_uint8       pred_Q8[  MAX_LPC_ORDER ];
      71             :     opus_int16       ec_ix[    MAX_LPC_ORDER ];
      72             :     opus_int16       res_Q10[  MAX_LPC_ORDER ];
      73             :     opus_int32       NLSF_Q15_tmp;
      74             :     const opus_uint8 *pCB_element;
      75             :     const opus_int16 *pCB_Wght_Q9;
      76             : 
      77             :     /* Unpack entropy table indices and predictor for current CB1 index */
      78           0 :     silk_NLSF_unpack( ec_ix, pred_Q8, psNLSF_CB, NLSFIndices[ 0 ] );
      79             : 
      80             :     /* Predictive residual dequantizer */
      81           0 :     silk_NLSF_residual_dequant( res_Q10, &NLSFIndices[ 1 ], pred_Q8, psNLSF_CB->quantStepSize_Q16, psNLSF_CB->order );
      82             : 
      83             :     /* Apply inverse square-rooted weights to first stage and add to output */
      84           0 :     pCB_element = &psNLSF_CB->CB1_NLSF_Q8[ NLSFIndices[ 0 ] * psNLSF_CB->order ];
      85           0 :     pCB_Wght_Q9 = &psNLSF_CB->CB1_Wght_Q9[ NLSFIndices[ 0 ] * psNLSF_CB->order ];
      86           0 :     for( i = 0; i < psNLSF_CB->order; i++ ) {
      87           0 :         NLSF_Q15_tmp = silk_ADD_LSHIFT32( silk_DIV32_16( silk_LSHIFT( (opus_int32)res_Q10[ i ], 14 ), pCB_Wght_Q9[ i ] ), (opus_int16)pCB_element[ i ], 7 );
      88           0 :         pNLSF_Q15[ i ] = (opus_int16)silk_LIMIT( NLSF_Q15_tmp, 0, 32767 );
      89             :     }
      90             : 
      91             :     /* NLSF stabilization */
      92           0 :     silk_NLSF_stabilize( pNLSF_Q15, psNLSF_CB->deltaMin_Q15, psNLSF_CB->order );
      93           0 : }