Add mising cmake file from make dist
[opus.git] / silk / quant_LTP_gains.c
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27
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31
32 #include "main.h"
33 #include "tuning_parameters.h"
34
35 void silk_quant_LTP_gains(
36     opus_int16                  B_Q14[ MAX_NB_SUBFR * LTP_ORDER ],          /* O    Quantized LTP gains             */
37     opus_int8                   cbk_index[ MAX_NB_SUBFR ],                  /* O    Codebook Index                  */
38     opus_int8                   *periodicity_index,                         /* O    Periodicity Index               */
39     opus_int32                  *sum_log_gain_Q7,                           /* I/O  Cumulative max prediction gain  */
40     opus_int                    *pred_gain_dB_Q7,                           /* O    LTP prediction gain             */
41     const opus_int32            XX_Q17[ MAX_NB_SUBFR*LTP_ORDER*LTP_ORDER ], /* I    Correlation matrix in Q18       */
42     const opus_int32            xX_Q17[ MAX_NB_SUBFR*LTP_ORDER ],           /* I    Correlation vector in Q18       */
43     const opus_int              subfr_len,                                  /* I    Number of samples per subframe  */
44     const opus_int              nb_subfr,                                   /* I    Number of subframes             */
45     int                         arch                                        /* I    Run-time architecture           */
46 )
47 {
48     opus_int             j, k, cbk_size;
49     opus_int8            temp_idx[ MAX_NB_SUBFR ];
50     const opus_uint8     *cl_ptr_Q5;
51     const opus_int8      *cbk_ptr_Q7;
52     const opus_uint8     *cbk_gain_ptr_Q7;
53     const opus_int32     *XX_Q17_ptr, *xX_Q17_ptr;
54     opus_int32           res_nrg_Q15_subfr, res_nrg_Q15, rate_dist_Q7_subfr, rate_dist_Q7, min_rate_dist_Q7;
55     opus_int32           sum_log_gain_tmp_Q7, best_sum_log_gain_Q7, max_gain_Q7;
56     opus_int             gain_Q7;
57
58     /***************************************************/
59     /* iterate over different codebooks with different */
60     /* rates/distortions, and choose best */
61     /***************************************************/
62     min_rate_dist_Q7 = silk_int32_MAX;
63     best_sum_log_gain_Q7 = 0;
64     for( k = 0; k < 3; k++ ) {
65         /* Safety margin for pitch gain control, to take into account factors
66            such as state rescaling/rewhitening. */
67         opus_int32 gain_safety = SILK_FIX_CONST( 0.4, 7 );
68
69         cl_ptr_Q5  = silk_LTP_gain_BITS_Q5_ptrs[ k ];
70         cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[        k ];
71         cbk_gain_ptr_Q7 = silk_LTP_vq_gain_ptrs_Q7[ k ];
72         cbk_size   = silk_LTP_vq_sizes[          k ];
73
74         /* Set up pointers to first subframe */
75         XX_Q17_ptr = XX_Q17;
76         xX_Q17_ptr = xX_Q17;
77
78         res_nrg_Q15 = 0;
79         rate_dist_Q7 = 0;
80         sum_log_gain_tmp_Q7 = *sum_log_gain_Q7;
81         for( j = 0; j < nb_subfr; j++ ) {
82             max_gain_Q7 = silk_log2lin( ( SILK_FIX_CONST( MAX_SUM_LOG_GAIN_DB / 6.0, 7 ) - sum_log_gain_tmp_Q7 )
83                                         + SILK_FIX_CONST( 7, 7 ) ) - gain_safety;
84             silk_VQ_WMat_EC(
85                 &temp_idx[ j ],         /* O    index of best codebook vector                           */
86                 &res_nrg_Q15_subfr,     /* O    residual energy                                         */
87                 &rate_dist_Q7_subfr,    /* O    best weighted quantization error + mu * rate            */
88                 &gain_Q7,               /* O    sum of absolute LTP coefficients                        */
89                 XX_Q17_ptr,             /* I    correlation matrix                                      */
90                 xX_Q17_ptr,             /* I    correlation vector                                      */
91                 cbk_ptr_Q7,             /* I    codebook                                                */
92                 cbk_gain_ptr_Q7,        /* I    codebook effective gains                                */
93                 cl_ptr_Q5,              /* I    code length for each codebook vector                    */
94                 subfr_len,              /* I    number of samples per subframe                          */
95                 max_gain_Q7,            /* I    maximum sum of absolute LTP coefficients                */
96                 cbk_size,               /* I    number of vectors in codebook                           */
97                 arch                    /* I    Run-time architecture                                   */
98             );
99
100             res_nrg_Q15  = silk_ADD_POS_SAT32( res_nrg_Q15, res_nrg_Q15_subfr );
101             rate_dist_Q7 = silk_ADD_POS_SAT32( rate_dist_Q7, rate_dist_Q7_subfr );
102             sum_log_gain_tmp_Q7 = silk_max(0, sum_log_gain_tmp_Q7
103                                 + silk_lin2log( gain_safety + gain_Q7 ) - SILK_FIX_CONST( 7, 7 ));
104
105             XX_Q17_ptr += LTP_ORDER * LTP_ORDER;
106             xX_Q17_ptr += LTP_ORDER;
107         }
108
109         if( rate_dist_Q7 <= min_rate_dist_Q7 ) {
110             min_rate_dist_Q7 = rate_dist_Q7;
111             *periodicity_index = (opus_int8)k;
112             silk_memcpy( cbk_index, temp_idx, nb_subfr * sizeof( opus_int8 ) );
113             best_sum_log_gain_Q7 = sum_log_gain_tmp_Q7;
114         }
115     }
116
117     cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ *periodicity_index ];
118     for( j = 0; j < nb_subfr; j++ ) {
119         for( k = 0; k < LTP_ORDER; k++ ) {
120             B_Q14[ j * LTP_ORDER + k ] = silk_LSHIFT( cbk_ptr_Q7[ cbk_index[ j ] * LTP_ORDER + k ], 7 );
121         }
122     }
123
124     if( nb_subfr == 2 ) {
125         res_nrg_Q15 = silk_RSHIFT32( res_nrg_Q15, 1 );
126     } else {
127         res_nrg_Q15 = silk_RSHIFT32( res_nrg_Q15, 2 );
128     }
129
130     *sum_log_gain_Q7 = best_sum_log_gain_Q7;
131     *pred_gain_dB_Q7 = (opus_int)silk_SMULBB( -3, silk_lin2log( res_nrg_Q15 ) - ( 15 << 7 ) );
132 }