Disabling some unused SILK functions from the float build
[opus.git] / silk / NLSF_del_dec_quant.c
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27
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31
32 #include "main.h"
33
34 /* Delayed-decision quantizer for NLSF residuals */
35 opus_int32 silk_NLSF_del_dec_quant(                             /* O    Returns RD value in Q25                     */
36     opus_int8                   indices[],                      /* O    Quantization indices [ order ]              */
37     const opus_int16            x_Q10[],                        /* I    Input [ order ]                             */
38     const opus_int16            w_Q5[],                         /* I    Weights [ order ]                           */
39     const opus_uint8            pred_coef_Q8[],                 /* I    Backward predictor coefs [ order ]          */
40     const opus_int16            ec_ix[],                        /* I    Indices to entropy coding tables [ order ]  */
41     const opus_uint8            ec_rates_Q5[],                  /* I    Rates []                                    */
42     const opus_int              quant_step_size_Q16,            /* I    Quantization step size                      */
43     const opus_int16            inv_quant_step_size_Q6,         /* I    Inverse quantization step size              */
44     const opus_int32            mu_Q20,                         /* I    R/D tradeoff                                */
45     const opus_int16            order                           /* I    Number of input values                      */
46 )
47 {
48     opus_int         i, j, nStates, ind_tmp, ind_min_max, ind_max_min, in_Q10, res_Q10;
49     opus_int         pred_Q10, diff_Q10, out0_Q10, out1_Q10, rate0_Q5, rate1_Q5;
50     opus_int32       RD_tmp_Q25, min_Q25, min_max_Q25, max_min_Q25, pred_coef_Q16;
51     opus_int         ind_sort[         NLSF_QUANT_DEL_DEC_STATES ];
52     opus_int8        ind[              NLSF_QUANT_DEL_DEC_STATES ][ MAX_LPC_ORDER ];
53     opus_int16       prev_out_Q10[ 2 * NLSF_QUANT_DEL_DEC_STATES ];
54     opus_int32       RD_Q25[       2 * NLSF_QUANT_DEL_DEC_STATES ];
55     opus_int32       RD_min_Q25[       NLSF_QUANT_DEL_DEC_STATES ];
56     opus_int32       RD_max_Q25[       NLSF_QUANT_DEL_DEC_STATES ];
57     const opus_uint8 *rates_Q5;
58
59     silk_assert( (NLSF_QUANT_DEL_DEC_STATES & (NLSF_QUANT_DEL_DEC_STATES-1)) == 0 );     /* must be power of two */
60
61     nStates = 1;
62     RD_Q25[ 0 ] = 0;
63     prev_out_Q10[ 0 ] = 0;
64     for( i = order - 1; ; i-- ) {
65         rates_Q5 = &ec_rates_Q5[ ec_ix[ i ] ];
66         pred_coef_Q16 = silk_LSHIFT( (opus_int32)pred_coef_Q8[ i ], 8 );
67         in_Q10 = x_Q10[ i ];
68         for( j = 0; j < nStates; j++ ) {
69             pred_Q10 = silk_SMULWB( pred_coef_Q16, prev_out_Q10[ j ] );
70             res_Q10  = silk_SUB16( in_Q10, pred_Q10 );
71             ind_tmp  = silk_SMULWB( inv_quant_step_size_Q6, res_Q10 );
72             ind_tmp  = silk_LIMIT( ind_tmp, -NLSF_QUANT_MAX_AMPLITUDE_EXT, NLSF_QUANT_MAX_AMPLITUDE_EXT-1 );
73             ind[ j ][ i ] = (opus_int8)ind_tmp;
74
75             /* compute outputs for ind_tmp and ind_tmp + 1 */
76             out0_Q10 = silk_LSHIFT( ind_tmp, 10 );
77             out1_Q10 = silk_ADD16( out0_Q10, 1024 );
78             if( ind_tmp > 0 ) {
79                 out0_Q10 = silk_SUB16( out0_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
80                 out1_Q10 = silk_SUB16( out1_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
81             } else if( ind_tmp == 0 ) {
82                 out1_Q10 = silk_SUB16( out1_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
83             } else if( ind_tmp == -1 ) {
84                 out0_Q10 = silk_ADD16( out0_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
85             } else {
86                 out0_Q10 = silk_ADD16( out0_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
87                 out1_Q10 = silk_ADD16( out1_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
88             }
89             out0_Q10  = silk_SMULWB( out0_Q10, quant_step_size_Q16 );
90             out1_Q10  = silk_SMULWB( out1_Q10, quant_step_size_Q16 );
91             out0_Q10  = silk_ADD16( out0_Q10, pred_Q10 );
92             out1_Q10  = silk_ADD16( out1_Q10, pred_Q10 );
93             prev_out_Q10[ j           ] = out0_Q10;
94             prev_out_Q10[ j + nStates ] = out1_Q10;
95
96             /* compute RD for ind_tmp and ind_tmp + 1 */
97             if( ind_tmp + 1 >= NLSF_QUANT_MAX_AMPLITUDE ) {
98                 if( ind_tmp + 1 == NLSF_QUANT_MAX_AMPLITUDE ) {
99                     rate0_Q5 = rates_Q5[ ind_tmp + NLSF_QUANT_MAX_AMPLITUDE ];
100                     rate1_Q5 = 280;
101                 } else {
102                     rate0_Q5 = silk_SMLABB( 280 - 43 * NLSF_QUANT_MAX_AMPLITUDE, 43, ind_tmp );
103                     rate1_Q5 = silk_ADD16( rate0_Q5, 43 );
104                 }
105             } else if( ind_tmp <= -NLSF_QUANT_MAX_AMPLITUDE ) {
106                 if( ind_tmp == -NLSF_QUANT_MAX_AMPLITUDE ) {
107                     rate0_Q5 = 280;
108                     rate1_Q5 = rates_Q5[ ind_tmp + 1 + NLSF_QUANT_MAX_AMPLITUDE ];
109                 } else {
110                     rate0_Q5 = silk_SMLABB( 280 - 43 * NLSF_QUANT_MAX_AMPLITUDE, -43, ind_tmp );
111                     rate1_Q5 = silk_SUB16( rate0_Q5, 43 );
112                 }
113             } else {
114                 rate0_Q5 = rates_Q5[ ind_tmp +     NLSF_QUANT_MAX_AMPLITUDE ];
115                 rate1_Q5 = rates_Q5[ ind_tmp + 1 + NLSF_QUANT_MAX_AMPLITUDE ];
116             }
117             RD_tmp_Q25            = RD_Q25[ j ];
118             diff_Q10              = silk_SUB16( in_Q10, out0_Q10 );
119             RD_Q25[ j ]           = silk_SMLABB( silk_MLA( RD_tmp_Q25, silk_SMULBB( diff_Q10, diff_Q10 ), w_Q5[ i ] ), mu_Q20, rate0_Q5 );
120             diff_Q10              = silk_SUB16( in_Q10, out1_Q10 );
121             RD_Q25[ j + nStates ] = silk_SMLABB( silk_MLA( RD_tmp_Q25, silk_SMULBB( diff_Q10, diff_Q10 ), w_Q5[ i ] ), mu_Q20, rate1_Q5 );
122         }
123
124         if( nStates < NLSF_QUANT_DEL_DEC_STATES ) {
125             /* double number of states and copy */
126             for( j = 0; j < nStates; j++ ) {
127                 ind[ j + nStates ][ i ] = ind[ j ][ i ] + 1;
128             }
129             nStates = silk_LSHIFT( nStates, 1 );
130             for( j = nStates; j < NLSF_QUANT_DEL_DEC_STATES; j++ ) {
131                 ind[ j ][ i ] = ind[ j - nStates ][ i ];
132             }
133         } else if( i > 0 ) {
134             /* sort lower and upper half of RD_Q25, pairwise */
135             for( j = 0; j < NLSF_QUANT_DEL_DEC_STATES; j++ ) {
136                 if( RD_Q25[ j ] > RD_Q25[ j + NLSF_QUANT_DEL_DEC_STATES ] ) {
137                     RD_max_Q25[ j ]                         = RD_Q25[ j ];
138                     RD_min_Q25[ j ]                         = RD_Q25[ j + NLSF_QUANT_DEL_DEC_STATES ];
139                     RD_Q25[ j ]                             = RD_min_Q25[ j ];
140                     RD_Q25[ j + NLSF_QUANT_DEL_DEC_STATES ] = RD_max_Q25[ j ];
141                     /* swap prev_out values */
142                     out0_Q10 = prev_out_Q10[ j ];
143                     prev_out_Q10[ j ] = prev_out_Q10[ j + NLSF_QUANT_DEL_DEC_STATES ];
144                     prev_out_Q10[ j + NLSF_QUANT_DEL_DEC_STATES ] = out0_Q10;
145                     ind_sort[ j ] = j + NLSF_QUANT_DEL_DEC_STATES;
146                 } else {
147                     RD_min_Q25[ j ] = RD_Q25[ j ];
148                     RD_max_Q25[ j ] = RD_Q25[ j + NLSF_QUANT_DEL_DEC_STATES ];
149                     ind_sort[ j ] = j;
150                 }
151             }
152             /* compare the highest RD values of the winning half with the lowest one in the losing half, and copy if necessary */
153             /* afterwards ind_sort[] will contain the indices of the NLSF_QUANT_DEL_DEC_STATES winning RD values */
154             while( 1 ) {
155                 min_max_Q25 = silk_int32_MAX;
156                 max_min_Q25 = 0;
157                 ind_min_max = 0;
158                 ind_max_min = 0;
159                 for( j = 0; j < NLSF_QUANT_DEL_DEC_STATES; j++ ) {
160                     if( min_max_Q25 > RD_max_Q25[ j ] ) {
161                         min_max_Q25 = RD_max_Q25[ j ];
162                         ind_min_max = j;
163                     }
164                     if( max_min_Q25 < RD_min_Q25[ j ] ) {
165                         max_min_Q25 = RD_min_Q25[ j ];
166                         ind_max_min = j;
167                     }
168                 }
169                 if( min_max_Q25 >= max_min_Q25 ) {
170                     break;
171                 }
172                 /* copy ind_min_max to ind_max_min */
173                 ind_sort[     ind_max_min ] = ind_sort[     ind_min_max ] ^ NLSF_QUANT_DEL_DEC_STATES;
174                 RD_Q25[       ind_max_min ] = RD_Q25[       ind_min_max + NLSF_QUANT_DEL_DEC_STATES ];
175                 prev_out_Q10[ ind_max_min ] = prev_out_Q10[ ind_min_max + NLSF_QUANT_DEL_DEC_STATES ];
176                 RD_min_Q25[   ind_max_min ] = 0;
177                 RD_max_Q25[   ind_min_max ] = silk_int32_MAX;
178                 silk_memcpy( ind[ ind_max_min ], ind[ ind_min_max ], MAX_LPC_ORDER * sizeof( opus_int8 ) );
179             }
180             /* increment index if it comes from the upper half */
181             for( j = 0; j < NLSF_QUANT_DEL_DEC_STATES; j++ ) {
182                 ind[ j ][ i ] += silk_RSHIFT( ind_sort[ j ], NLSF_QUANT_DEL_DEC_STATES_LOG2 );
183             }
184         } else {  /* i == 0 */
185             break;
186         }
187     }
188
189     /* last sample: find winner, copy indices and return RD value */
190     ind_tmp = 0;
191     min_Q25 = silk_int32_MAX;
192     for( j = 0; j < 2 * NLSF_QUANT_DEL_DEC_STATES; j++ ) {
193         if( min_Q25 > RD_Q25[ j ] ) {
194             min_Q25 = RD_Q25[ j ];
195             ind_tmp = j;
196         }
197     }
198     for( j = 0; j < order; j++ ) {
199         indices[ j ] = ind[ ind_tmp & ( NLSF_QUANT_DEL_DEC_STATES - 1 ) ][ j ];
200         silk_assert( indices[ j ] >= -NLSF_QUANT_MAX_AMPLITUDE_EXT );
201         silk_assert( indices[ j ] <=  NLSF_QUANT_MAX_AMPLITUDE_EXT );
202     }
203     indices[ 0 ] += silk_RSHIFT( ind_tmp, NLSF_QUANT_DEL_DEC_STATES_LOG2 );
204     silk_assert( indices[ 0 ] <= NLSF_QUANT_MAX_AMPLITUDE_EXT );
205     silk_assert( min_Q25 >= 0 );
206     return min_Q25;
207 }