Line data Source code
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 :
35 0 : 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 0 : min_rate_dist_Q7 = silk_int32_MAX;
63 0 : best_sum_log_gain_Q7 = 0;
64 0 : 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 0 : opus_int32 gain_safety = SILK_FIX_CONST( 0.4, 7 );
68 :
69 0 : cl_ptr_Q5 = silk_LTP_gain_BITS_Q5_ptrs[ k ];
70 0 : cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ k ];
71 0 : cbk_gain_ptr_Q7 = silk_LTP_vq_gain_ptrs_Q7[ k ];
72 0 : cbk_size = silk_LTP_vq_sizes[ k ];
73 :
74 : /* Set up pointers to first subframe */
75 0 : XX_Q17_ptr = XX_Q17;
76 0 : xX_Q17_ptr = xX_Q17;
77 :
78 0 : res_nrg_Q15 = 0;
79 0 : rate_dist_Q7 = 0;
80 0 : sum_log_gain_tmp_Q7 = *sum_log_gain_Q7;
81 0 : for( j = 0; j < nb_subfr; j++ ) {
82 0 : 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 0 : 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 0 : res_nrg_Q15 = silk_ADD_POS_SAT32( res_nrg_Q15, res_nrg_Q15_subfr );
101 0 : rate_dist_Q7 = silk_ADD_POS_SAT32( rate_dist_Q7, rate_dist_Q7_subfr );
102 0 : 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 0 : XX_Q17_ptr += LTP_ORDER * LTP_ORDER;
106 0 : xX_Q17_ptr += LTP_ORDER;
107 : }
108 :
109 0 : if( rate_dist_Q7 <= min_rate_dist_Q7 ) {
110 0 : min_rate_dist_Q7 = rate_dist_Q7;
111 0 : *periodicity_index = (opus_int8)k;
112 0 : silk_memcpy( cbk_index, temp_idx, nb_subfr * sizeof( opus_int8 ) );
113 0 : best_sum_log_gain_Q7 = sum_log_gain_tmp_Q7;
114 : }
115 : }
116 :
117 0 : cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ *periodicity_index ];
118 0 : for( j = 0; j < nb_subfr; j++ ) {
119 0 : for( k = 0; k < LTP_ORDER; k++ ) {
120 0 : B_Q14[ j * LTP_ORDER + k ] = silk_LSHIFT( cbk_ptr_Q7[ cbk_index[ j ] * LTP_ORDER + k ], 7 );
121 : }
122 : }
123 :
124 0 : if( nb_subfr == 2 ) {
125 0 : res_nrg_Q15 = silk_RSHIFT32( res_nrg_Q15, 1 );
126 : } else {
127 0 : res_nrg_Q15 = silk_RSHIFT32( res_nrg_Q15, 2 );
128 : }
129 :
130 0 : *sum_log_gain_Q7 = best_sum_log_gain_Q7;
131 0 : *pred_gain_dB_Q7 = (opus_int)silk_SMULBB( -3, silk_lin2log( res_nrg_Q15 ) - ( 15 << 7 ) );
132 0 : }
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