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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
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,const opus_int32 W_Q18[MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER],opus_int mu_Q9,opus_int lowComplexity,const opus_int nb_subfr)35 void silk_quant_LTP_gains(
36 opus_int16 B_Q14[ MAX_NB_SUBFR * LTP_ORDER ], /* I/O (un)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 const opus_int32 W_Q18[ MAX_NB_SUBFR*LTP_ORDER*LTP_ORDER ], /* I Error Weights in Q18 */
41 opus_int mu_Q9, /* I Mu value (R/D tradeoff) */
42 opus_int lowComplexity, /* I Flag for low complexity */
43 const opus_int nb_subfr /* I number of subframes */
44 )
45 {
46 opus_int j, k, cbk_size;
47 opus_int8 temp_idx[ MAX_NB_SUBFR ];
48 const opus_uint8 *cl_ptr_Q5;
49 const opus_int8 *cbk_ptr_Q7;
50 const opus_uint8 *cbk_gain_ptr_Q7;
51 const opus_int16 *b_Q14_ptr;
52 const opus_int32 *W_Q18_ptr;
53 opus_int32 rate_dist_Q14_subfr, rate_dist_Q14, min_rate_dist_Q14;
54 opus_int32 sum_log_gain_tmp_Q7, best_sum_log_gain_Q7, max_gain_Q7, gain_Q7;
55
56 /***************************************************/
57 /* iterate over different codebooks with different */
58 /* rates/distortions, and choose best */
59 /***************************************************/
60 min_rate_dist_Q14 = silk_int32_MAX;
61 best_sum_log_gain_Q7 = 0;
62 for( k = 0; k < 3; k++ ) {
63 /* Safety margin for pitch gain control, to take into account factors
64 such as state rescaling/rewhitening. */
65 opus_int32 gain_safety = SILK_FIX_CONST( 0.4, 7 );
66
67 cl_ptr_Q5 = silk_LTP_gain_BITS_Q5_ptrs[ k ];
68 cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ k ];
69 cbk_gain_ptr_Q7 = silk_LTP_vq_gain_ptrs_Q7[ k ];
70 cbk_size = silk_LTP_vq_sizes[ k ];
71
72 /* Set up pointer to first subframe */
73 W_Q18_ptr = W_Q18;
74 b_Q14_ptr = B_Q14;
75
76 rate_dist_Q14 = 0;
77 sum_log_gain_tmp_Q7 = *sum_log_gain_Q7;
78 for( j = 0; j < nb_subfr; j++ ) {
79 max_gain_Q7 = silk_log2lin( ( SILK_FIX_CONST( MAX_SUM_LOG_GAIN_DB / 6.0, 7 ) - sum_log_gain_tmp_Q7 )
80 + SILK_FIX_CONST( 7, 7 ) ) - gain_safety;
81
82 silk_VQ_WMat_EC(
83 &temp_idx[ j ], /* O index of best codebook vector */
84 &rate_dist_Q14_subfr, /* O best weighted quantization error + mu * rate */
85 &gain_Q7, /* O sum of absolute LTP coefficients */
86 b_Q14_ptr, /* I input vector to be quantized */
87 W_Q18_ptr, /* I weighting matrix */
88 cbk_ptr_Q7, /* I codebook */
89 cbk_gain_ptr_Q7, /* I codebook effective gains */
90 cl_ptr_Q5, /* I code length for each codebook vector */
91 mu_Q9, /* I tradeoff between weighted error and rate */
92 max_gain_Q7, /* I maximum sum of absolute LTP coefficients */
93 cbk_size /* I number of vectors in codebook */
94 );
95
96 rate_dist_Q14 = silk_ADD_POS_SAT32( rate_dist_Q14, rate_dist_Q14_subfr );
97 sum_log_gain_tmp_Q7 = silk_max(0, sum_log_gain_tmp_Q7
98 + silk_lin2log( gain_safety + gain_Q7 ) - SILK_FIX_CONST( 7, 7 ));
99
100 b_Q14_ptr += LTP_ORDER;
101 W_Q18_ptr += LTP_ORDER * LTP_ORDER;
102 }
103
104 /* Avoid never finding a codebook */
105 rate_dist_Q14 = silk_min( silk_int32_MAX - 1, rate_dist_Q14 );
106
107 if( rate_dist_Q14 < min_rate_dist_Q14 ) {
108 min_rate_dist_Q14 = rate_dist_Q14;
109 *periodicity_index = (opus_int8)k;
110 silk_memcpy( cbk_index, temp_idx, nb_subfr * sizeof( opus_int8 ) );
111 best_sum_log_gain_Q7 = sum_log_gain_tmp_Q7;
112 }
113
114 /* Break early in low-complexity mode if rate distortion is below threshold */
115 if( lowComplexity && ( rate_dist_Q14 < silk_LTP_gain_middle_avg_RD_Q14 ) ) {
116 break;
117 }
118 }
119
120 cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ *periodicity_index ];
121 for( j = 0; j < nb_subfr; j++ ) {
122 for( k = 0; k < LTP_ORDER; k++ ) {
123 B_Q14[ j * LTP_ORDER + k ] = silk_LSHIFT( cbk_ptr_Q7[ cbk_index[ j ] * LTP_ORDER + k ], 7 );
124 }
125 }
126 *sum_log_gain_Q7 = best_sum_log_gain_Q7;
127 }
128
129