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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 */
silk_NLSF_unpack(opus_int16 ec_ix[],opus_uint8 pred_Q8[],const silk_NLSF_CB_struct * psNLSF_CB,const opus_int CB1_index)35 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     ec_sel_ptr = &psNLSF_CB->ec_sel[ CB1_index * psNLSF_CB->order / 2 ];
47     for( i = 0; i < psNLSF_CB->order; i += 2 ) {
48         entry = *ec_sel_ptr++;
49         ec_ix  [ i     ] = silk_SMULBB( silk_RSHIFT( entry, 1 ) & 7, 2 * NLSF_QUANT_MAX_AMPLITUDE + 1 );
50         pred_Q8[ i     ] = psNLSF_CB->pred_Q8[ i + ( entry & 1 ) * ( psNLSF_CB->order - 1 ) ];
51         ec_ix  [ i + 1 ] = silk_SMULBB( silk_RSHIFT( entry, 5 ) & 7, 2 * NLSF_QUANT_MAX_AMPLITUDE + 1 );
52         pred_Q8[ i + 1 ] = psNLSF_CB->pred_Q8[ i + ( silk_RSHIFT( entry, 4 ) & 1 ) * ( psNLSF_CB->order - 1 ) + 1 ];
53     }
54 }
55 
56