-
Notifications
You must be signed in to change notification settings - Fork 18
/
pitch_ref.cc
167 lines (131 loc) · 4.57 KB
/
pitch_ref.cc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
/*
* Project 25 IMBE Encoder/Decoder Fixed-Point implementation
* Developed by Pavel Yazev E-mail: pyazev@gmail.com
* Version 1.0 (c) Copyright 2009
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* The software is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Boston, MA
* 02110-1301, USA.
*/
#include "typedef.h"
#include "globals.h"
#include "imbe.h"
#include "basic_op.h"
#include "aux_sub.h"
#include "math_sub.h"
#include "dsp_sub.h"
#include "tbls.h"
#include "pitch_ref.h"
#include <cstdio>
#include <cstdlib>
#include <cmath>
#define PITCH_REF_FRAME 221
#define MIN_INDEX 50
void pitch_ref(IMBE_PARAM *imbe_param, Cmplx16 *fft_buf)
{
Word16 i, j, index_a_save, pitch_est, tmp, shift, index_wr, up_lim;
Cmplx16 sp_rec[FFTLENGTH/2];
Word32 fund_freq, fund_freq_2, fund_freq_acc_a, fund_freq_acc_b, fund_freq_acc, L_tmp, amp_re_acc, amp_im_acc, L_sum, L_diff_min;
Word16 ha, hb, index_a, index_b, index_tbl[20], it_ind, re_tmp, im_tmp, pitch_cand=0;
Word32 fund_freq_cand=0;
pitch_est = shl(imbe_param->pitch, 7); // Convert to Q8.8
pitch_est = sub(pitch_est, CNST_1_125_Q8_8); // Sub 1.125 = 9/8
L_diff_min = MAX_32;
for(i = 0; i < 19; i++)
{
shift = norm_s(pitch_est);
tmp = shl(pitch_est, shift);
tmp = div_s(0x4000, tmp);
fund_freq = L_shl(tmp, shift + 11);
fund_freq_acc = fund_freq;
fund_freq_2 = L_shr(fund_freq, 1);
fund_freq_acc_a = L_sub(fund_freq, fund_freq_2);
fund_freq_acc_b = L_add(fund_freq, fund_freq_2);
// Calculate upper limit for spectrum reconstruction
up_lim = extract_h(L_shr((UWord32)CNST_0_9254_Q0_16 * pitch_est, 1)); // 0.9254/fund_freq
up_lim = sub(up_lim, CNST_0_5_Q8_8); // sub 0.5
up_lim = up_lim & 0xFF00; // extract fixed part
up_lim = mult(up_lim, extract_h(fund_freq));
up_lim = shr(up_lim, 1);
index_b = 0;
while(index_b <= up_lim)
{
ha = extract_h(fund_freq_acc_a);
hb = extract_h(fund_freq_acc_b);
index_a = (ha >> 8) + ((ha & 0xFF)?1:0);
index_b = (hb >> 8) + ((hb & 0xFF)?1:0);
if(index_b >= MIN_INDEX)
{
L_tmp = L_shl(L_deposit_h(index_a), 8);
L_tmp = L_sub(L_tmp, fund_freq_acc);
L_tmp = L_add(L_tmp, 0x00020000); // for rounding purpose
L_tmp = L_shr(L_tmp, 2);
index_a_save = index_a;
it_ind = 0;
amp_re_acc = amp_im_acc = 0;
while(index_a < index_b)
{
index_wr = extract_h(L_tmp);
if(index_wr < 0 && (L_tmp & 0xFFFF)) // truncating for negative number
index_wr = add(index_wr, 1);
index_wr = add(index_wr, 160);
index_tbl[it_ind++] = index_wr;
if(index_wr >= 0 && index_wr <= 320)
{
amp_re_acc = L_mac(amp_re_acc, fft_buf[index_a].re, wr_sp[index_wr]);
amp_im_acc = L_mac(amp_im_acc, fft_buf[index_a].im, wr_sp[index_wr]);
}
index_a++;
L_tmp = L_add(L_tmp, 0x400000);
}
it_ind = 0;
index_a = index_a_save;
while(index_a < index_b)
{
index_wr = index_tbl[it_ind++];
if(index_wr < 0 || index_wr > 320)
{
sp_rec[index_a].im = sp_rec[index_a].re = 0;
}
else
{
sp_rec[index_a].im = mult(mult(extract_h(amp_im_acc), wr_sp[index_wr]), 0x6666);
sp_rec[index_a].re = mult(mult(extract_h(amp_re_acc), wr_sp[index_wr]), 0x6666);
}
index_a++;
}
}
fund_freq_acc_a = L_add(fund_freq_acc_a, fund_freq);
fund_freq_acc_b = L_add(fund_freq_acc_b, fund_freq);
fund_freq_acc = L_add(fund_freq_acc, fund_freq);
}
L_sum = 0;
for(j = MIN_INDEX; j <= up_lim; j++)
{
re_tmp = sub(fft_buf[j].re, sp_rec[j].re);
im_tmp = sub(fft_buf[j].im, sp_rec[j].im);
L_sum = L_mac(L_sum, re_tmp, re_tmp);
L_sum = L_mac(L_sum, im_tmp, im_tmp);
}
if(L_sum < L_diff_min)
{
L_diff_min = L_sum;
pitch_cand = pitch_est;
fund_freq_cand = fund_freq;
}
pitch_est = add(pitch_est, CNST_0_125_Q8_8); // Add 0.125 = 1/8
}
imbe_param->ref_pitch = pitch_cand;
imbe_param->fund_freq = fund_freq_cand;
}