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
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
|
/*
** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
** Copyright (C) 2003-2005 M. Bakker, Nero AG, http://www.nero.com
**
** This program 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 2 of the License, or
** (at your option) any later version.
**
** This program 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 program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
**
** Any non-GPL usage of this software or parts of this software is strictly
** forbidden.
**
** The "appropriate copyright message" mentioned in section 2c of the GPLv2
** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com"
**
** Commercial non-GPL licensing of this software is possible.
** For more info contact Nero AG through Mpeg4AAClicense@nero.com.
**
** $Id: sbr_tf_grid.c,v 1.20 2008/09/19 22:50:20 menno Exp $
**/
/* Time/Frequency grid */
#include "common.h"
#include "structs.h"
#ifdef SBR_DEC
#include <stdlib.h>
#include "sbr_syntax.h"
#include "sbr_tf_grid.h"
/* static function declarations */
#if 0
static int16_t rel_bord_lead(sbr_info *sbr, uint8_t ch, uint8_t l);
static int16_t rel_bord_trail(sbr_info *sbr, uint8_t ch, uint8_t l);
#endif
static uint8_t middleBorder(sbr_info *sbr, uint8_t ch);
/* function constructs new time border vector */
/* first build into temp vector to be able to use previous vector on error */
uint8_t envelope_time_border_vector(sbr_info *sbr, uint8_t ch)
{
uint8_t l, border, temp;
uint8_t t_E_temp[6] = {0};
t_E_temp[0] = sbr->rate * sbr->abs_bord_lead[ch];
t_E_temp[sbr->L_E[ch]] = sbr->rate * sbr->abs_bord_trail[ch];
switch (sbr->bs_frame_class[ch])
{
case FIXFIX:
switch (sbr->L_E[ch])
{
case 4:
temp = (sbr->numTimeSlots / 4);
t_E_temp[3] = sbr->rate * 3 * temp;
t_E_temp[2] = sbr->rate * 2 * temp;
t_E_temp[1] = sbr->rate * temp;
break;
case 2:
t_E_temp[1] = sbr->rate * (sbr->numTimeSlots / 2);
break;
default:
break;
}
break;
case FIXVAR:
if (sbr->L_E[ch] > 1)
{
int8_t i = sbr->L_E[ch];
border = sbr->abs_bord_trail[ch];
for (l = 0; l < (sbr->L_E[ch] - 1); l++)
{
if (border < sbr->bs_rel_bord[ch][l])
return 1;
border -= sbr->bs_rel_bord[ch][l];
t_E_temp[--i] = sbr->rate * border;
}
}
break;
case VARFIX:
if (sbr->L_E[ch] > 1)
{
int8_t i = 1;
border = sbr->abs_bord_lead[ch];
for (l = 0; l < (sbr->L_E[ch] - 1); l++)
{
border += sbr->bs_rel_bord[ch][l];
if (sbr->rate * border + sbr->tHFAdj > sbr->numTimeSlotsRate+sbr->tHFGen)
return 1;
t_E_temp[i++] = sbr->rate * border;
}
}
break;
case VARVAR:
if (sbr->bs_num_rel_0[ch])
{
int8_t i = 1;
border = sbr->abs_bord_lead[ch];
for (l = 0; l < sbr->bs_num_rel_0[ch]; l++)
{
border += sbr->bs_rel_bord_0[ch][l];
if (sbr->rate * border + sbr->tHFAdj > sbr->numTimeSlotsRate+sbr->tHFGen)
return 1;
t_E_temp[i++] = sbr->rate * border;
}
}
if (sbr->bs_num_rel_1[ch])
{
int8_t i = sbr->L_E[ch];
border = sbr->abs_bord_trail[ch];
for (l = 0; l < sbr->bs_num_rel_1[ch]; l++)
{
if (border < sbr->bs_rel_bord_1[ch][l])
return 1;
border -= sbr->bs_rel_bord_1[ch][l];
t_E_temp[--i] = sbr->rate * border;
}
}
break;
}
/* no error occured, we can safely use this t_E vector */
for (l = 0; l < 6; l++)
{
sbr->t_E[ch][l] = t_E_temp[l];
}
return 0;
}
void noise_floor_time_border_vector(sbr_info *sbr, uint8_t ch)
{
sbr->t_Q[ch][0] = sbr->t_E[ch][0];
if (sbr->L_E[ch] == 1)
{
sbr->t_Q[ch][1] = sbr->t_E[ch][1];
sbr->t_Q[ch][2] = 0;
} else {
uint8_t index = middleBorder(sbr, ch);
sbr->t_Q[ch][1] = sbr->t_E[ch][index];
sbr->t_Q[ch][2] = sbr->t_E[ch][sbr->L_E[ch]];
}
}
#if 0
static int16_t rel_bord_lead(sbr_info *sbr, uint8_t ch, uint8_t l)
{
uint8_t i;
int16_t acc = 0;
switch (sbr->bs_frame_class[ch])
{
case FIXFIX:
return sbr->numTimeSlots/sbr->L_E[ch];
case FIXVAR:
return 0;
case VARFIX:
for (i = 0; i < l; i++)
{
acc += sbr->bs_rel_bord[ch][i];
}
return acc;
case VARVAR:
for (i = 0; i < l; i++)
{
acc += sbr->bs_rel_bord_0[ch][i];
}
return acc;
}
return 0;
}
static int16_t rel_bord_trail(sbr_info *sbr, uint8_t ch, uint8_t l)
{
uint8_t i;
int16_t acc = 0;
switch (sbr->bs_frame_class[ch])
{
case FIXFIX:
case VARFIX:
return 0;
case FIXVAR:
for (i = 0; i < l; i++)
{
acc += sbr->bs_rel_bord[ch][i];
}
return acc;
case VARVAR:
for (i = 0; i < l; i++)
{
acc += sbr->bs_rel_bord_1[ch][i];
}
return acc;
}
return 0;
}
#endif
static uint8_t middleBorder(sbr_info *sbr, uint8_t ch)
{
int8_t retval = 0;
switch (sbr->bs_frame_class[ch])
{
case FIXFIX:
retval = sbr->L_E[ch]/2;
break;
case VARFIX:
if (sbr->bs_pointer[ch] == 0)
retval = 1;
else if (sbr->bs_pointer[ch] == 1)
retval = sbr->L_E[ch] - 1;
else
retval = sbr->bs_pointer[ch] - 1;
break;
case FIXVAR:
case VARVAR:
if (sbr->bs_pointer[ch] > 1)
retval = sbr->L_E[ch] + 1 - sbr->bs_pointer[ch];
else
retval = sbr->L_E[ch] - 1;
break;
}
return (retval > 0) ? retval : 0;
}
#endif
|
