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1 /***********************************************************************
2 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
3 Redistribution and use in source and binary forms, with or without
4 modification, are permitted provided that the following conditions
5 are met:
6 - Redistributions of source code must retain the above copyright notice,
7 this list of conditions and the following disclaimer.
8 - Redistributions in binary form must reproduce the above copyright
9 notice, this list of conditions and the following disclaimer in the
10 documentation and/or other materials provided with the distribution.
11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
12 names of specific contributors, may be used to endorse or promote
13 products derived from this software without specific prior written
14 permission.
15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 POSSIBILITY OF SUCH DAMAGE.
26 ***********************************************************************/
27 
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31 
32 #include "main.h"
33 #include "tuning_parameters.h"
34 
silk_quant_LTP_gains(opus_int16 B_Q14[MAX_NB_SUBFR * LTP_ORDER],opus_int8 cbk_index[MAX_NB_SUBFR],opus_int8 * periodicity_index,opus_int32 * sum_log_gain_Q7,opus_int * pred_gain_dB_Q7,const opus_int32 XX_Q17[MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER],const opus_int32 xX_Q17[MAX_NB_SUBFR * LTP_ORDER],const opus_int subfr_len,const opus_int nb_subfr,int arch)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 }
133