Line data Source code
1 : /******************************************************************************
2 : * ETSI TS 103 634 V1.5.1 *
3 : * Low Complexity Communication Codec Plus (LC3plus) *
4 : * *
5 : * Copyright licence is solely granted through ETSI Intellectual Property *
6 : * Rights Policy, 3rd April 2019. No patent licence is granted by implication, *
7 : * estoppel or otherwise. *
8 : ******************************************************************************/
9 :
10 : #include "options.h"
11 : #include "wmc_auto.h"
12 : #include "functions.h"
13 :
14 : static void filter_olpa(LC3_FLOAT* in, LC3_FLOAT* out, const LC3_FLOAT* buf, LC3_INT32 len_input);
15 : static LC3_INT searchMaxIndice(LC3_FLOAT* in, LC3_INT32 len);
16 :
17 0 : void filter_olpa(LC3_FLOAT* in, LC3_FLOAT* out, const LC3_FLOAT* buf, LC3_INT32 len_input)
18 : {
19 : /* a = 1, so denominator == 1, nothing to do here */
20 : LC3_INT32 i, j;
21 :
22 :
23 0 : j = 0;
24 0 : for (i = 4; i < len_input; i += 2) {
25 0 : out[j++] = (buf[0] * in[i]) + (buf[1] * in[i - 1]) + (buf[2] * in[i - 2]) + (buf[3] * in[i - 3]) + (buf[4] * in[i - 4]);
26 : }
27 0 : }
28 :
29 0 : LC3_INT searchMaxIndice(LC3_FLOAT* in, LC3_INT len)
30 : {
31 0 : LC3_INT max_i = 0, i;
32 0 : LC3_FLOAT max = in[0];
33 :
34 0 : if (len <= 0) {
35 0 : return -128;
36 : }
37 :
38 0 : for (i = 0; i < len; i++) {
39 0 : if (in[i] > max) {
40 0 : max = in[i];
41 0 : max_i = i;
42 : }
43 : }
44 :
45 0 : return max_i;
46 : }
47 :
48 0 : void processOlpa_fl(LC3_FLOAT* s_12k8, LC3_FLOAT* mem_s12k8, LC3_FLOAT* mem_s6k4, LC3_INT* mem_old_T0,
49 : LC3_INT* pitch_flag,
50 : LC3_INT* T0_out, LC3_FLOAT* normcorr_out, LC3_INT len, LC3_INT frame_dms)
51 : {
52 0 : LC3_FLOAT norm_corr = 0, sum = 0, sum0 = 0, sum1 = 0, sum2 = 0, norm_corr2 = 0, *s6k4;
53 : LC3_FLOAT buf[LEN_6K4 + MAX_PITCH_6K4 + MAX_LEN], R0[RANGE_PITCH_6K4]; /* constant length */
54 0 : LC3_INT i = 0, len2 = 0, T0 = 0, T02 = 0, min_pitch = 0, max_pitch = 0, L = 0, mem_in_len = 0, acflen = 0, delta = 0;
55 :
56 0 : len2 = len / 2;
57 0 : switch(frame_dms)
58 : {
59 0 : case 50:
60 0 : delta = len / 2;
61 0 : acflen = len2 * 2;
62 0 : break;
63 :
64 0 : case 25:
65 0 : delta = 3*(len /2);
66 0 : acflen = len2*4;
67 0 : break;
68 :
69 0 : default:
70 0 : delta = 0;
71 0 : acflen = len2;
72 : }
73 :
74 0 : mem_in_len = MAX_PITCH_6K4 + delta;
75 :
76 : /* Downsampling */
77 0 : move_float(buf, mem_s12k8, 3);
78 0 : move_float(&buf[3], s_12k8, len);
79 0 : move_float(mem_s12k8, &buf[len], 3);
80 0 : filter_olpa(buf, R0, olpa_down2, len + 3);
81 :
82 : /* Compute autocorrelation */
83 0 : s6k4 = &buf[mem_in_len - delta];
84 0 : move_float(&buf[mem_in_len], R0, len2);
85 0 : move_float(buf, mem_s6k4, mem_in_len);
86 0 : move_float(mem_s6k4, &buf[len2], mem_in_len);
87 0 : for (i = MIN_PITCH_6K4; i <= MAX_PITCH_6K4; i++) {
88 0 : sum = mac_loop(s6k4, &s6k4[-i], acflen);
89 0 : R0[i - MIN_PITCH_6K4] = sum;
90 : }
91 :
92 : /* Weight autocorrelation and find maximum */
93 :
94 : /* Second try in the neighborhood of the previous pitch */
95 0 : min_pitch = MAX(MIN_PITCH_6K4, *mem_old_T0 - 4);
96 0 : max_pitch = MIN(MAX_PITCH_6K4, *mem_old_T0 + 4);
97 :
98 0 : L = searchMaxIndice(&R0[min_pitch - MIN_PITCH_6K4], max_pitch - min_pitch + 1 );
99 0 : T02 = L + min_pitch;
100 :
101 0 : for (i = 0; i < RANGE_PITCH_6K4; i++) {
102 0 : R0[i] = R0[i] * olpa_acw[i];
103 : }
104 0 : L = searchMaxIndice(R0, RANGE_PITCH_6K4);
105 0 : T0 = L + MIN_PITCH_6K4;
106 :
107 : /* Compute normalized correlation */
108 0 : sum0 = sum1 = sum2 = 0;
109 :
110 0 : for (i = 0; i < acflen; i++) {
111 0 : sum0 += s6k4[i] * s6k4[i - T0];
112 0 : sum1 += s6k4[i - T0] * s6k4[i - T0];
113 0 : sum2 += s6k4[i] * s6k4[i];
114 : }
115 0 : sum1 = sum1 * sum2;
116 0 : sum1 = LC3_SQRT(sum1) + 1.00e-05;
117 0 : norm_corr = sum0 / sum1;
118 0 : norm_corr = MAX(0, norm_corr);
119 :
120 0 : if (T02 != T0) {
121 0 : sum0 = sum1 = sum2 = 0;
122 0 : for (i = 0; i < acflen; i++) {
123 0 : sum0 += s6k4[i] * s6k4[i - T02];
124 0 : sum1 += s6k4[i - T02] * s6k4[i - T02];
125 0 : sum2 += s6k4[i] * s6k4[i];
126 : }
127 0 : sum1 = sum1 * sum2;
128 0 : sum1 = LC3_SQRT(sum1) + 1.00e-05;
129 0 : norm_corr2 = sum0 / sum1;
130 0 : norm_corr2 = MAX(0, norm_corr2);
131 :
132 0 : if (norm_corr2 > (norm_corr * 0.85)) {
133 0 : T0 = T02;
134 0 : norm_corr = norm_corr2;
135 : }
136 : }
137 :
138 0 : switch(frame_dms)
139 : {
140 0 : case 50:
141 0 : if (*pitch_flag == 1)
142 : {
143 0 : *mem_old_T0 = T0;
144 0 : *pitch_flag = 0;
145 : }
146 : else
147 : {
148 0 : *pitch_flag += 1;
149 : }
150 0 : break;
151 :
152 0 : case 25:
153 0 : if (*pitch_flag == 3)
154 : {
155 0 : *mem_old_T0 = T0;
156 0 : *pitch_flag = 0;
157 : }
158 : else
159 : {
160 0 : *pitch_flag += 1;
161 : }
162 0 : break;
163 :
164 0 : default:
165 0 : *mem_old_T0 = T0;
166 : }
167 :
168 0 : *T0_out = T0 * 2.0;
169 0 : *normcorr_out = norm_corr;
170 :
171 0 : }
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