-
Notifications
You must be signed in to change notification settings - Fork 7
/
Copy pathiLBC_define.pas
213 lines (159 loc) · 6.18 KB
/
iLBC_define.pas
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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
{
publish with BSD Licence.
Copyright (c) Terry Lao
}
unit iLBC_define;
{$MODE Delphi}
interface
Const
{ general codec settings }
FS = 8000.0;
BLOCKL_20MS = 160 ;
BLOCKL_30MS = 240 ;
BLOCKL_MAX = 240 ;
NSUB_20MS = 4 ;
NSUB_30MS = 6 ;
NSUB_MAX = 6 ;
NASUB_20MS = 2 ;
NASUB_30MS = 4 ;
NASUB_MAX = 4 ;
SUBL =40 ;
STATE_LEN = 80;
STATE_SHORT_LEN_30MS= 58;
STATE_SHORT_LEN_20MS= 57;
{ LPC settings }
LPC_FILTERORDER = 10 ;
LPC_CHIRP_SYNTDENUM = 0.9025 ;
LPC_CHIRP_WEIGHTDENUM = 0.4222 ;
LPC_LOOKBACK = 60 ;
LPC_N_20MS = 1 ;
LPC_N_30MS = 2 ;
LPC_N_MAX = 2 ;
LPC_ASYMDIFF = 20 ;
LPC_BW = 60.0 ;
LPC_WN = 1.0001 ;
LSF_NSPLIT = 3 ;
LSF_NUMBER_OF_STEPS = 4 ;
LPC_HALFORDER = (LPC_FILTERORDER div 2);
{ cb settings }
CB_NSTAGES = 3 ;
CB_EXPAND = 2 ;
CB_MEML = 147 ;
CB_FILTERLEN = 2*4 ;
CB_HALFFILTERLEN = 4 ;
CB_RESRANGE = 34 ;
CB_MAXGAIN = 1.3 ;
{ enhancer }
ENH_BLOCKL = 80; { block length }
ENH_BLOCKL_HALF = (ENH_BLOCKL div 2);
ENH_HL = 3; { 2*ENH_HL+1 is number blocks
in said second sequence }
ENH_SLOP = 2; { max difference estimated and
correct pitch period }
ENH_PLOCSL = 20; { pitch-estimates and pitch-
locations buffer length }
ENH_OVERHANG = 2;
ENH_UPS0 = 4; { upsampling rate }
ENH_FL0 = 3; { 2*FLO+1 is the length of
each filter }
ENH_VECTL = (ENH_BLOCKL+2*ENH_FL0);
ENH_CORRDIM = (2*ENH_SLOP+1);
ENH_NBLOCKS = (BLOCKL_MAX div ENH_BLOCKL);
ENH_NBLOCKS_EXTRA = 5;
ENH_NBLOCKS_TOT = 8; { ENH_NBLOCKS +
ENH_NBLOCKS_EXTRA }
ENH_BUFL = (ENH_NBLOCKS_TOT)*ENH_BLOCKL;
ENH_ALPHA0 = 0.05;
{ Down sampling }
FILTERORDER_DS = 7;
DELAY_DS = 3 ;
FACTOR_DS = 2;
{ bit stream defs }
NO_OF_BYTES_20MS = 38 ;
NO_OF_BYTES_30MS = 50 ;
NO_OF_WORDS_20MS = 19 ;
NO_OF_WORDS_30MS = 25 ;
STATE_BITS = 3;
BYTE_LEN = 8 ;
ULP_CLASSES = 3;
{ help parameters }
FLOAT_MAX = 1.0e37 ;
EPS = 2.220446049250313e-016;
PI = 3.14159265358979323846;
MIN_SAMPLE = -32768 ;
MAX_SAMPLE = 32767 ;
TWO_PI = 6.283185307 ;
PI2 = 0.159154943 ;
Type
{ type definition encoder instance }
piLBC_ULP_Inst_t=^iLBC_ULP_Inst_t;
iLBC_ULP_Inst_t=record
lsf_bits: array [0..5,0..ULP_CLASSES+1] of Integer;
start_bits: array [0..ULP_CLASSES+1] of Integer;
startfirst_bits:array [0..ULP_CLASSES+1] of Integer;
scale_bits:array [0..ULP_CLASSES+1] of integer;
state_bits:array [0..ULP_CLASSES+1] of integer;
extra_cb_index:array [0..CB_NSTAGES-1,0..ULP_CLASSES+1] of integer;
extra_cb_gain:array [0..CB_NSTAGES-1,0..ULP_CLASSES+1] of integer;
cb_index:array [0..NSUB_MAX-1,0..CB_NSTAGES-1,0..ULP_CLASSES+1] of integer;
cb_gain:array [0..NSUB_MAX-1,0..CB_NSTAGES-1,0..ULP_CLASSES+1] of integer;
end;
{ type definition encoder instance }
piLBC_Enc_Inst_t=^iLBC_Enc_Inst_t;
iLBC_Enc_Inst_t=record
{ flag for frame size mode }
mode:integer;
{ basic parameters for different frame sizes }
blockl:integer;
nsub:integer;
nasub:integer;
no_of_bytes, no_of_words:integer;
lpc_n:integer;
state_short_len:integer;
ULP_inst:^iLBC_ULP_Inst_t;
{ analysis filter state }
anaMem:array [0..LPC_FILTERORDER-1] of real;
{ old lsf parameters for interpolation }
lsfold:array [0..LPC_FILTERORDER-1] of real;
lsfdeqold:array [0..LPC_FILTERORDER-1] of real;
{ signal buffer for LP analysis }
lpc_buffer:array [0..LPC_LOOKBACK + BLOCKL_MAX-1] of real;
{ state of input HP filter }
hpimem:array [0..3] of real;
end;
{ type definition decoder instance }
piLBC_Dec_Inst_t=^iLBC_Dec_Inst_t;
iLBC_Dec_Inst_t=record
{ flag for frame size mode }
mode:integer;
{ basic parameters for different frame sizes }
blockl:integer;
nsub:integer;
nasub:integer;
no_of_bytes, no_of_words:integer;
lpc_n:integer;
state_short_len:integer;
ULP_inst:^iLBC_ULP_Inst_t;
{ synthesis filter state }
syntMem:array [0..LPC_FILTERORDER-1] of real;
{ old LSF for interpolation }
lsfdeqold:array [0..LPC_FILTERORDER-1 ] of real;
{ pitch lag estimated in enhancer and used in PLC }
last_lag:integer;
{ PLC state information }
prevLag, consPLICount, prevPLI, prev_enh_pl:integer;
prevLpc:array [0..LPC_FILTERORDER] of real;
prevResidual:array [0..NSUB_MAX*SUBL-1] of real;
per:real;
seed:cardinal;
{ previous synthesis filter parameters }
old_syntdenum:array [0..(LPC_FILTERORDER + 1)*NSUB_MAX-1] of real;
{ state of output HP filter }
hpomem:array [0..3] of real;
{ enhancer state information }
use_enhancer:integer;
enh_buf:array [0..ENH_BUFL-1] of real;
enh_period:array [0..ENH_NBLOCKS_TOT-1] of real;
end;
implementation
end.