FFmpeg
2.6.9
Main Page
Related Pages
Modules
Namespaces
Data Structures
Files
Examples
File List
Globals
All
Data Structures
Namespaces
Files
Functions
Variables
Typedefs
Enumerations
Enumerator
Macros
Groups
Pages
libavcodec
arm
vp56_arith.h
Go to the documentation of this file.
1
/*
2
* Copyright (C) 2010 Mans Rullgard <mans@mansr.com>
3
*
4
* This file is part of FFmpeg.
5
*
6
* FFmpeg is free software; you can redistribute it and/or
7
* modify it under the terms of the GNU Lesser General Public
8
* License as published by the Free Software Foundation; either
9
* version 2.1 of the License, or (at your option) any later version.
10
*
11
* FFmpeg is distributed in the hope that it will be useful,
12
* but WITHOUT ANY WARRANTY; without even the implied warranty of
13
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14
* Lesser General Public License for more details.
15
*
16
* You should have received a copy of the GNU Lesser General Public
17
* License along with FFmpeg; if not, write to the Free Software
18
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
*/
20
21
#ifndef AVCODEC_ARM_VP56_ARITH_H
22
#define AVCODEC_ARM_VP56_ARITH_H
23
24
#if CONFIG_THUMB
25
# define A(x)
26
# define T(x) x
27
#else
28
# define A(x) x
29
# define T(x)
30
#endif
31
32
#if CONFIG_THUMB || defined __clang__
33
# define L(x)
34
# define U(x) x
35
#else
36
# define L(x) x
37
# define U(x)
38
#endif
39
40
#if HAVE_ARMV6_INLINE
41
42
#define vp56_rac_get_prob vp56_rac_get_prob_armv6
43
static
inline
int
vp56_rac_get_prob_armv6(
VP56RangeCoder
*
c
,
int
pr)
44
{
45
unsigned
shift
=
ff_vp56_norm_shift
[c->
high
];
46
unsigned
code_word = c->
code_word
<<
shift
;
47
unsigned
high = c->
high
<<
shift
;
48
unsigned
bit;
49
50
__asm__ (
"adds %3, %3, %0 \n"
51
"itt cs \n"
52
"cmpcs %7, %4 \n"
53
L
(
"ldrcsh %2, [%4], #2 \n"
)
54
U
(
"ldrhcs %2, [%4], #2 \n"
)
55
"rsb %0, %6, #256 \n"
56
"smlabb %0, %5, %6, %0 \n"
57
T
(
"itttt cs \n"
)
58
"rev16cs %2, %2 \n"
59
T
(
"lslcs %2, %2, %3 \n"
)
60
T
(
"orrcs %1, %1, %2 \n"
)
61
A
(
"orrcs %1, %1, %2, lsl %3 \n"
)
62
"subcs %3, %3, #16 \n"
63
"lsr %0, %0, #8 \n"
64
"cmp %1, %0, lsl #16 \n"
65
"ittte ge \n"
66
"subge %1, %1, %0, lsl #16 \n"
67
"subge %0, %5, %0 \n"
68
"movge %2, #1 \n"
69
"movlt %2, #0 \n"
70
:
"=&r"
(c->
high
),
"=&r"
(c->
code_word
),
"=&r"
(bit),
71
"+&r"
(c->
bits
),
"+&r"
(c->
buffer
)
72
:
"r"
(high),
"r"
(pr),
"r"
(c->
end
- 1),
73
"0"
(shift),
"1"
(code_word)
74
:
"cc"
);
75
76
return
bit;
77
}
78
79
#define vp56_rac_get_prob_branchy vp56_rac_get_prob_branchy_armv6
80
static
inline
int
vp56_rac_get_prob_branchy_armv6(
VP56RangeCoder
*
c
,
int
pr)
81
{
82
unsigned
shift
=
ff_vp56_norm_shift
[c->
high
];
83
unsigned
code_word = c->
code_word
<<
shift
;
84
unsigned
high = c->
high
<<
shift
;
85
unsigned
low;
86
unsigned
tmp;
87
88
__asm__ (
"adds %3, %3, %0 \n"
89
"itt cs \n"
90
"cmpcs %7, %4 \n"
91
L
(
"ldrcsh %2, [%4], #2 \n"
)
92
U
(
"ldrhcs %2, [%4], #2 \n"
)
93
"rsb %0, %6, #256 \n"
94
"smlabb %0, %5, %6, %0 \n"
95
T
(
"itttt cs \n"
)
96
"rev16cs %2, %2 \n"
97
T
(
"lslcs %2, %2, %3 \n"
)
98
T
(
"orrcs %1, %1, %2 \n"
)
99
A
(
"orrcs %1, %1, %2, lsl %3 \n"
)
100
"subcs %3, %3, #16 \n"
101
"lsr %0, %0, #8 \n"
102
"lsl %2, %0, #16 \n"
103
:
"=&r"
(low),
"+&r"
(code_word),
"=&r"
(tmp),
104
"+&r"
(c->
bits
),
"+&r"
(c->
buffer
)
105
:
"r"
(high),
"r"
(pr),
"r"
(c->
end
- 1),
"0"
(shift)
106
:
"cc"
);
107
108
if
(code_word >= tmp) {
109
c->
high
= high - low;
110
c->
code_word
= code_word - tmp;
111
return
1;
112
}
113
114
c->
high
= low;
115
c->
code_word
= code_word;
116
return
0;
117
}
118
119
#endif
120
121
#endif
/* AVCODEC_ARM_VP56_ARITH_H */
Generated on Tue Jun 21 2022 16:27:40 for FFmpeg by
1.8.1.2