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
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       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
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      22             : INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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      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             : /* Unpack predictor values and indices for entropy coding tables */
      35           0 : void silk_NLSF_unpack(
      36             :           opus_int16            ec_ix[],                        /* O    Indices to entropy tables [ LPC_ORDER ]     */
      37             :           opus_uint8            pred_Q8[],                      /* O    LSF predictor [ LPC_ORDER ]                 */
      38             :     const silk_NLSF_CB_struct   *psNLSF_CB,                     /* I    Codebook object                             */
      39             :     const opus_int              CB1_index                       /* I    Index of vector in first LSF codebook       */
      40             : )
      41             : {
      42             :     opus_int   i;
      43             :     opus_uint8 entry;
      44             :     const opus_uint8 *ec_sel_ptr;
      45             : 
      46           0 :     ec_sel_ptr = &psNLSF_CB->ec_sel[ CB1_index * psNLSF_CB->order / 2 ];
      47           0 :     for( i = 0; i < psNLSF_CB->order; i += 2 ) {
      48           0 :         entry = *ec_sel_ptr++;
      49           0 :         ec_ix  [ i     ] = silk_SMULBB( silk_RSHIFT( entry, 1 ) & 7, 2 * NLSF_QUANT_MAX_AMPLITUDE + 1 );
      50           0 :         pred_Q8[ i     ] = psNLSF_CB->pred_Q8[ i + ( entry & 1 ) * ( psNLSF_CB->order - 1 ) ];
      51           0 :         ec_ix  [ i + 1 ] = silk_SMULBB( silk_RSHIFT( entry, 5 ) & 7, 2 * NLSF_QUANT_MAX_AMPLITUDE + 1 );
      52           0 :         pred_Q8[ i + 1 ] = psNLSF_CB->pred_Q8[ i + ( silk_RSHIFT( entry, 4 ) & 1 ) * ( psNLSF_CB->order - 1 ) + 1 ];
      53             :     }
      54           0 : }
      55             :