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
|
/******************************************************************************
* *
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*****************************************************************************
* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
*/
#include "ixheaacd_sbr_common.h"
#include "ixheaac_type_def.h"
#include "ixheaac_constants.h"
#include "ixheaac_basic_ops32.h"
#include "ixheaac_basic_ops16.h"
#include "ixheaac_basic_ops40.h"
#include "ixheaac_basic_op.h"
#include "ixheaac_basic_ops.h"
#include "ixheaacd_intrinsics.h"
#include "ixheaacd_common_rom.h"
#include "ixheaacd_basic_funcs.h"
#define sat16_m(a) ixheaac_sat16(a)
VOID ixheaacd_fix_mant_exp_add(WORD16 op1_mant, WORD16 op1_exp, WORD16 op2_mant,
WORD16 op2_exp, WORD16 *ptr_result_mant,
WORD16 *ptr_result_exp) {
WORD32 new_mant;
WORD32 new_exp;
new_exp = op1_exp - op2_exp;
if (new_exp < 0) {
if (new_exp < -31) {
new_exp = -31;
}
op1_mant = op1_mant >> (-new_exp);
new_exp = op2_exp;
} else {
if (new_exp > 31) {
new_exp = 31;
}
op2_mant = op2_mant >> new_exp;
new_exp = op1_exp;
}
new_mant = op1_mant + op2_mant;
if (ixheaac_abs32(new_mant) >= 0x8000) {
new_mant = new_mant >> 1;
new_exp++;
}
*ptr_result_mant = new_mant;
*ptr_result_exp = (WORD16)(new_exp);
}
WORD32 ixheaacd_fix_mant_div(WORD16 op1_mant, WORD16 op2_mant,
WORD16 *ptr_result_mant,
ixheaacd_misc_tables *pstr_common_tables)
{
WORD32 pre_shift_val, post_shift_val;
WORD32 index;
WORD16 one_by_op2_mant;
pre_shift_val = ixheaac_norm32(op2_mant) - 16;
index = (op2_mant << pre_shift_val) >> (SHORT_BITS - 3 - 8);
index &= (1 << (8 + 1)) - 1;
if (index == 0) {
post_shift_val = ixheaac_norm32(op1_mant) - 16;
*ptr_result_mant = (op1_mant << post_shift_val);
} else {
WORD32 ratio_m;
index = ((index - 1) >> 1);
one_by_op2_mant = pstr_common_tables->inv_table[index];
ratio_m = ixheaac_mult16x16in32(one_by_op2_mant, op1_mant);
post_shift_val = ixheaac_norm32(ratio_m) - 1;
*ptr_result_mant = (WORD16)((ratio_m << post_shift_val) >> 15);
}
return (pre_shift_val - post_shift_val);
}
VOID ixheaacd_fix_mant_exp_sqrt(WORD16 *ptr_in_out, WORD16 *sqrt_table) {
WORD32 index;
WORD32 pre_shift_val;
WORD32 op_mant = *ptr_in_out;
WORD32 op_exp = *(ptr_in_out + 1);
WORD32 result_m;
WORD32 result_e;
if (op_mant > 0) {
pre_shift_val = (ixheaac_norm32((WORD16)op_mant) - 16);
op_exp = (op_exp - pre_shift_val);
index = (op_mant << pre_shift_val) >> (SHORT_BITS - 3 - 8);
index &= (1 << (8 + 1)) - 1;
result_m = sqrt_table[index >> 1];
if ((op_exp & 1) != 0) {
result_m = (result_m * 0x5a82) >> 16;
op_exp += 3;
}
result_e = (op_exp >> 1);
} else {
result_m = 0;
result_e = -SHORT_BITS;
}
*ptr_in_out++ = (WORD16)result_m;
*ptr_in_out = (WORD16)result_e;
}
WORD32 ixheaacd_fix_div_dec(WORD32 op1, WORD32 op2) {
WORD32 quotient = 0;
UWORD32 abs_num, abs_den;
WORD32 k;
WORD32 sign;
abs_num = ixheaac_abs32(op1 >> 1);
abs_den = ixheaac_abs32(op2 >> 1);
sign = op1 ^ op2;
if (abs_num != 0) {
for (k = 15; k > 0; k--) {
quotient = (quotient << 1);
abs_num = (abs_num << 1);
if (abs_num >= abs_den) {
abs_num -= abs_den;
quotient++;
}
}
}
if (sign < 0) quotient = -(quotient);
return quotient;
}
#define ONE_IN_Q30 0x40000000
static PLATFORM_INLINE WORD32 ixheaacd_one_by_sqrt_calc(WORD32 op) {
WORD32 a = ixheaac_add32_sat(0x900ebee0,
ixheaac_mult32x16in32_shl_sat(op, 0x39d9));
WORD32 iy =
ixheaac_add32_sat(0x573b645a, ixheaac_mult32x16h_in32_shl_sat(op, a));
iy = ixheaac_shl32_dir_sat_limit(iy, 1);
a = ixheaac_mult32_shl_sat(op, iy);
a = ixheaac_sub32_sat(ONE_IN_Q30, ixheaac_shl32_dir_sat_limit(
ixheaac_mult32_shl_sat(a, iy), 1));
iy = ixheaac_add32_sat(iy, ixheaac_mult32_shl_sat(a, iy));
a = ixheaac_mult32_shl_sat(op, iy);
a = ixheaac_sub32_sat(ONE_IN_Q30, ixheaac_shl32_dir_sat_limit(
ixheaac_mult32_shl_sat(a, iy), 1));
iy = ixheaac_add32_sat(iy, ixheaac_mult32_shl_sat(a, iy));
a = ixheaac_mult32_shl_sat(op, iy);
a = ixheaac_sub32_sat(ONE_IN_Q30, ixheaac_shl32_dir_sat_limit(
ixheaac_mult32_shl_sat(a, iy), 1));
iy = ixheaac_add32_sat(iy, ixheaac_mult32_shl_sat(a, iy));
return iy;
}
WORD32 ixheaacd_sqrt(WORD32 op) {
WORD32 result = 0;
WORD16 shift;
if (op != 0) {
shift = (WORD16)(ixheaac_norm32(op) & ~1);
op = ixheaac_shl32_dir_sat_limit(op, shift);
shift = ixheaac_shr32_dir_sat_limit(shift, 1);
op = ixheaac_mult32_shl_sat(ixheaacd_one_by_sqrt_calc(op), op);
result = ixheaac_shr32_dir_sat_limit(op, ixheaac_sat16(shift - 1));
}
return result;
}
|
