FFmpeg
4.0
libavutil
arm
bswap.h
Go to the documentation of this file.
1
/*
2
* This file is part of FFmpeg.
3
*
4
* FFmpeg is free software; you can redistribute it and/or
5
* modify it under the terms of the GNU Lesser General Public
6
* License as published by the Free Software Foundation; either
7
* version 2.1 of the License, or (at your option) any later version.
8
*
9
* FFmpeg is distributed in the hope that it will be useful,
10
* but WITHOUT ANY WARRANTY; without even the implied warranty of
11
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12
* Lesser General Public License for more details.
13
*
14
* You should have received a copy of the GNU Lesser General Public
15
* License along with FFmpeg; if not, write to the Free Software
16
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17
*/
18
19
#ifndef AVUTIL_ARM_BSWAP_H
20
#define AVUTIL_ARM_BSWAP_H
21
22
#include <stdint.h>
23
#include "config.h"
24
#include "
libavutil/attributes.h
"
25
26
#ifdef __ARMCC_VERSION
27
28
#if HAVE_ARMV6
29
#define av_bswap32 av_bswap32
30
static
av_always_inline
av_const
uint32_t
av_bswap32
(uint32_t x)
31
{
32
return
__rev(x);
33
}
34
#endif
/* HAVE_ARMV6 */
35
36
#elif HAVE_INLINE_ASM
37
38
#if HAVE_ARMV6_INLINE
39
#define av_bswap16 av_bswap16
40
static
av_always_inline
av_const
unsigned
av_bswap16
(
unsigned
x)
41
{
42
__asm__(
"rev16 %0, %0"
:
"+r"
(x));
43
return
x;
44
}
45
#endif
46
47
#if AV_GCC_VERSION_AT_MOST(4,4)
48
#define av_bswap32 av_bswap32
49
static
av_always_inline
av_const
uint32_t
av_bswap32
(uint32_t x)
50
{
51
#if HAVE_ARMV6_INLINE
52
__asm__(
"rev %0, %0"
:
"+r"
(x));
53
#else
54
uint32_t t;
55
__asm__ (
"eor %1, %0, %0, ror #16 \n\t"
56
"bic %1, %1, #0xFF0000 \n\t"
57
"mov %0, %0, ror #8 \n\t"
58
"eor %0, %0, %1, lsr #8 \n\t"
59
:
"+r"
(x),
"=&r"
(t));
60
#endif
/* HAVE_ARMV6_INLINE */
61
return
x;
62
}
63
#endif
/* AV_GCC_VERSION_AT_MOST(4,4) */
64
65
#endif
/* __ARMCC_VERSION */
66
67
#endif
/* AVUTIL_ARM_BSWAP_H */
av_const
#define av_const
Definition:
attributes.h:76
av_bswap16
#define av_bswap16
Definition:
bswap.h:31
attributes.h
Macro definitions for various function/variable attributes.
av_bswap32
#define av_bswap32
Definition:
bswap.h:33
av_always_inline
#define av_always_inline
Definition:
attributes.h:39
Generated on Tue May 22 2018 07:06:59 for FFmpeg by
1.8.13