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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