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15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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26 ***********************************************************************/
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_QW,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 Quantized NLSF vector [ LPC_ORDER ] */
41 const silk_NLSF_CB_struct *psNLSF_CB, /* I Codebook object */
42 const opus_int16 *pW_QW, /* 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_Q26 );
51 VARDECL( opus_int32, RD_Q25 );
52 VARDECL( opus_int, tempIndices1 );
53 VARDECL( opus_int8, tempIndices2 );
54 opus_int16 res_Q15[ MAX_LPC_ORDER ];
55 opus_int16 res_Q10[ MAX_LPC_ORDER ];
56 opus_int16 NLSF_tmp_Q15[ MAX_LPC_ORDER ];
57 opus_int16 W_tmp_QW[ MAX_LPC_ORDER ];
58 opus_int16 W_adj_Q5[ MAX_LPC_ORDER ];
59 opus_uint8 pred_Q8[ MAX_LPC_ORDER ];
60 opus_int16 ec_ix[ MAX_LPC_ORDER ];
61 const opus_uint8 *pCB_element, *iCDF_ptr;
62 SAVE_STACK;
63
64 silk_assert( nSurvivors <= NLSF_VQ_MAX_SURVIVORS );
65 silk_assert( signalType >= 0 && signalType <= 2 );
66 silk_assert( NLSF_mu_Q20 <= 32767 && NLSF_mu_Q20 >= 0 );
67
68 /* NLSF stabilization */
69 silk_NLSF_stabilize( pNLSF_Q15, psNLSF_CB->deltaMin_Q15, psNLSF_CB->order );
70
71 /* First stage: VQ */
72 ALLOC( err_Q26, psNLSF_CB->nVectors, opus_int32 );
73 silk_NLSF_VQ( err_Q26, pNLSF_Q15, psNLSF_CB->CB1_NLSF_Q8, psNLSF_CB->nVectors, psNLSF_CB->order );
74
75 /* Sort the quantization errors */
76 ALLOC( tempIndices1, nSurvivors, opus_int );
77 silk_insertion_sort_increasing( err_Q26, tempIndices1, psNLSF_CB->nVectors, nSurvivors );
78
79 ALLOC( RD_Q25, nSurvivors, opus_int32 );
80 ALLOC( tempIndices2, nSurvivors * MAX_LPC_ORDER, opus_int8 );
81
82 /* Loop over survivors */
83 for( s = 0; s < nSurvivors; s++ ) {
84 ind1 = tempIndices1[ s ];
85
86 /* Residual after first stage */
87 pCB_element = &psNLSF_CB->CB1_NLSF_Q8[ ind1 * psNLSF_CB->order ];
88 for( i = 0; i < psNLSF_CB->order; i++ ) {
89 NLSF_tmp_Q15[ i ] = silk_LSHIFT16( (opus_int16)pCB_element[ i ], 7 );
90 res_Q15[ i ] = pNLSF_Q15[ i ] - NLSF_tmp_Q15[ i ];
91 }
92
93 /* Weights from codebook vector */
94 silk_NLSF_VQ_weights_laroia( W_tmp_QW, NLSF_tmp_Q15, psNLSF_CB->order );
95
96 /* Apply square-rooted weights */
97 for( i = 0; i < psNLSF_CB->order; i++ ) {
98 W_tmp_Q9 = silk_SQRT_APPROX( silk_LSHIFT( (opus_int32)W_tmp_QW[ i ], 18 - NLSF_W_Q ) );
99 res_Q10[ i ] = (opus_int16)silk_RSHIFT( silk_SMULBB( res_Q15[ i ], W_tmp_Q9 ), 14 );
100 }
101
102 /* Modify input weights accordingly */
103 for( i = 0; i < psNLSF_CB->order; i++ ) {
104 W_adj_Q5[ i ] = silk_DIV32_16( silk_LSHIFT( (opus_int32)pW_QW[ i ], 5 ), W_tmp_QW[ i ] );
105 }
106
107 /* Unpack entropy table indices and predictor for current CB1 index */
108 silk_NLSF_unpack( ec_ix, pred_Q8, psNLSF_CB, ind1 );
109
110 /* Trellis quantizer */
111 RD_Q25[ s ] = silk_NLSF_del_dec_quant( &tempIndices2[ s * MAX_LPC_ORDER ], res_Q10, W_adj_Q5, pred_Q8, ec_ix,
112 psNLSF_CB->ec_Rates_Q5, psNLSF_CB->quantStepSize_Q16, psNLSF_CB->invQuantStepSize_Q6, NLSF_mu_Q20, psNLSF_CB->order );
113
114 /* Add rate for first stage */
115 iCDF_ptr = &psNLSF_CB->CB1_iCDF[ ( signalType >> 1 ) * psNLSF_CB->nVectors ];
116 if( ind1 == 0 ) {
117 prob_Q8 = 256 - iCDF_ptr[ ind1 ];
118 } else {
119 prob_Q8 = iCDF_ptr[ ind1 - 1 ] - iCDF_ptr[ ind1 ];
120 }
121 bits_q7 = ( 8 << 7 ) - silk_lin2log( prob_Q8 );
122 RD_Q25[ s ] = silk_SMLABB( RD_Q25[ s ], bits_q7, silk_RSHIFT( NLSF_mu_Q20, 2 ) );
123 }
124
125 /* Find the lowest rate-distortion error */
126 silk_insertion_sort_increasing( RD_Q25, &bestIndex, nSurvivors, 1 );
127
128 NLSFIndices[ 0 ] = (opus_int8)tempIndices1[ bestIndex ];
129 silk_memcpy( &NLSFIndices[ 1 ], &tempIndices2[ bestIndex * MAX_LPC_ORDER ], psNLSF_CB->order * sizeof( opus_int8 ) );
130
131 /* Decode */
132 silk_NLSF_decode( pNLSF_Q15, NLSFIndices, psNLSF_CB );
133
134 ret = RD_Q25[ 0 ];
135 RESTORE_STACK;
136 return ret;
137 }
138