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27 
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31 
32 #include "main.h"
33 #include "stack_alloc.h"
34 
35 /***********************/
36 /* NLSF vector encoder */
37 /***********************/
silk_NLSF_encode(opus_int8 * NLSFIndices,opus_int16 * pNLSF_Q15,const silk_NLSF_CB_struct * psNLSF_CB,const opus_int16 * pW_Q2,const opus_int NLSF_mu_Q20,const opus_int nSurvivors,const opus_int signalType)38 opus_int32 silk_NLSF_encode(                                    /* O    Returns RD value in Q25                     */
39           opus_int8             *NLSFIndices,                   /* I    Codebook path vector [ LPC_ORDER + 1 ]      */
40           opus_int16            *pNLSF_Q15,                     /* I/O  (Un)quantized NLSF vector [ LPC_ORDER ]     */
41     const silk_NLSF_CB_struct   *psNLSF_CB,                     /* I    Codebook object                             */
42     const opus_int16            *pW_Q2,                         /* I    NLSF weight vector [ LPC_ORDER ]            */
43     const opus_int              NLSF_mu_Q20,                    /* I    Rate weight for the RD optimization         */
44     const opus_int              nSurvivors,                     /* I    Max survivors after first stage             */
45     const opus_int              signalType                      /* I    Signal type: 0/1/2                          */
46 )
47 {
48     opus_int         i, s, ind1, bestIndex, prob_Q8, bits_q7;
49     opus_int32       W_tmp_Q9, ret;
50     VARDECL( opus_int32, err_Q24 );
51     VARDECL( opus_int32, RD_Q25 );
52     VARDECL( opus_int, tempIndices1 );
53     VARDECL( opus_int8, tempIndices2 );
54     opus_int16       res_Q10[      MAX_LPC_ORDER ];
55     opus_int16       NLSF_tmp_Q15[ MAX_LPC_ORDER ];
56     opus_int16       W_adj_Q5[     MAX_LPC_ORDER ];
57     opus_uint8       pred_Q8[      MAX_LPC_ORDER ];
58     opus_int16       ec_ix[        MAX_LPC_ORDER ];
59     const opus_uint8 *pCB_element, *iCDF_ptr;
60     const opus_int16 *pCB_Wght_Q9;
61     SAVE_STACK;
62 
63     celt_assert( signalType >= 0 && signalType <= 2 );
64     silk_assert( NLSF_mu_Q20 <= 32767 && NLSF_mu_Q20 >= 0 );
65 
66     /* NLSF stabilization */
67     silk_NLSF_stabilize( pNLSF_Q15, psNLSF_CB->deltaMin_Q15, psNLSF_CB->order );
68 
69     /* First stage: VQ */
70     ALLOC( err_Q24, psNLSF_CB->nVectors, opus_int32 );
71     silk_NLSF_VQ( err_Q24, pNLSF_Q15, psNLSF_CB->CB1_NLSF_Q8, psNLSF_CB->CB1_Wght_Q9, psNLSF_CB->nVectors, psNLSF_CB->order );
72 
73     /* Sort the quantization errors */
74     ALLOC( tempIndices1, nSurvivors, opus_int );
75     silk_insertion_sort_increasing( err_Q24, tempIndices1, psNLSF_CB->nVectors, nSurvivors );
76 
77     ALLOC( RD_Q25, nSurvivors, opus_int32 );
78     ALLOC( tempIndices2, nSurvivors * MAX_LPC_ORDER, opus_int8 );
79 
80     /* Loop over survivors */
81     for( s = 0; s < nSurvivors; s++ ) {
82         ind1 = tempIndices1[ s ];
83 
84         /* Residual after first stage */
85         pCB_element = &psNLSF_CB->CB1_NLSF_Q8[ ind1 * psNLSF_CB->order ];
86         pCB_Wght_Q9 = &psNLSF_CB->CB1_Wght_Q9[ ind1 * psNLSF_CB->order ];
87         for( i = 0; i < psNLSF_CB->order; i++ ) {
88             NLSF_tmp_Q15[ i ] = silk_LSHIFT16( (opus_int16)pCB_element[ i ], 7 );
89             W_tmp_Q9 = pCB_Wght_Q9[ i ];
90             res_Q10[ i ] = (opus_int16)silk_RSHIFT( silk_SMULBB( pNLSF_Q15[ i ] - NLSF_tmp_Q15[ i ], W_tmp_Q9 ), 14 );
91             W_adj_Q5[ i ] = silk_DIV32_varQ( (opus_int32)pW_Q2[ i ], silk_SMULBB( W_tmp_Q9, W_tmp_Q9 ), 21 );
92         }
93 
94         /* Unpack entropy table indices and predictor for current CB1 index */
95         silk_NLSF_unpack( ec_ix, pred_Q8, psNLSF_CB, ind1 );
96 
97         /* Trellis quantizer */
98         RD_Q25[ s ] = silk_NLSF_del_dec_quant( &tempIndices2[ s * MAX_LPC_ORDER ], res_Q10, W_adj_Q5, pred_Q8, ec_ix,
99             psNLSF_CB->ec_Rates_Q5, psNLSF_CB->quantStepSize_Q16, psNLSF_CB->invQuantStepSize_Q6, NLSF_mu_Q20, psNLSF_CB->order );
100 
101         /* Add rate for first stage */
102         iCDF_ptr = &psNLSF_CB->CB1_iCDF[ ( signalType >> 1 ) * psNLSF_CB->nVectors ];
103         if( ind1 == 0 ) {
104             prob_Q8 = 256 - iCDF_ptr[ ind1 ];
105         } else {
106             prob_Q8 = iCDF_ptr[ ind1 - 1 ] - iCDF_ptr[ ind1 ];
107         }
108         bits_q7 = ( 8 << 7 ) - silk_lin2log( prob_Q8 );
109         RD_Q25[ s ] = silk_SMLABB( RD_Q25[ s ], bits_q7, silk_RSHIFT( NLSF_mu_Q20, 2 ) );
110     }
111 
112     /* Find the lowest rate-distortion error */
113     silk_insertion_sort_increasing( RD_Q25, &bestIndex, nSurvivors, 1 );
114 
115     NLSFIndices[ 0 ] = (opus_int8)tempIndices1[ bestIndex ];
116     silk_memcpy( &NLSFIndices[ 1 ], &tempIndices2[ bestIndex * MAX_LPC_ORDER ], psNLSF_CB->order * sizeof( opus_int8 ) );
117 
118     /* Decode */
119     silk_NLSF_decode( pNLSF_Q15, NLSFIndices, psNLSF_CB );
120 
121     ret = RD_Q25[ 0 ];
122     RESTORE_STACK;
123     return ret;
124 }
125