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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