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
|
/*****************************************************************
* gavl - a general purpose audio/video processing library
*
* Copyright (c) 2001 - 2024 Members of the Gmerlin project
* http://github.com/bplaum
*
* 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, see <http://www.gnu.org/licenses/>.
* *****************************************************************/
/* bswap.h taken from ffmpeg and adjusted to gavl,
* original copyright below
*/
/*
* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file bswap.h
* byte swap.
*/
#ifndef BSWAP_H_INCLUDED
#define BSWAP_H_INCLUDED
#ifdef HAVE_BYTESWAP_H
#include <byteswap.h>
#else
#ifdef ARCH_X86_64
# define LEGACY_REGS "=Q"
#else
# define LEGACY_REGS "=q"
#endif
static inline uint16_t bswap_16(uint16_t x)
{
#if defined(ARCH_X86)
__asm("rorw $8, %0" :
LEGACY_REGS (x) :
"0" (x));
#elif defined(ARCH_SH4)
__asm__("swap.b %0,%0":"=r"(x):"0"(x));
#else
x= (x>>8) | (x<<8);
#endif
return x;
}
static inline uint32_t bswap_32(uint32_t x)
{
#if defined(ARCH_X86)
#if __CPU__ != 386
__asm("bswap %0":
"=r" (x) :
#else
__asm("xchgb %b0,%h0\n"
" rorl $16,%0\n"
" xchgb %b0,%h0":
LEGACY_REGS (x) :
#endif
"0" (x));
#elif defined(ARCH_SH4)
__asm__(
"swap.b %0,%0\n"
"swap.w %0,%0\n"
"swap.b %0,%0\n"
:"=r"(x):"0"(x));
#elif defined(ARCH_ARM)
uint32_t t;
__asm__ (
"eor %1, %0, %0, ror #16 \n\t"
"bic %1, %1, #0xFF0000 \n\t"
"mov %0, %0, ror #8 \n\t"
"eor %0, %0, %1, lsr #8 \n\t"
: "+r"(x), "+r"(t));
#elif defined(ARCH_BFIN)
unsigned tmp;
asm("%1 = %0 >> 8 (V);\n\t"
"%0 = %0 << 8 (V);\n\t"
"%0 = %0 | %1;\n\t"
"%0 = PACK(%0.L, %0.H);\n\t"
: "+d"(x), "=&d"(tmp));
#else
x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
x= (x>>16) | (x<<16);
#endif
return x;
}
static inline uint64_t bswap_64(uint64_t x)
{
#if 0
x= ((x<< 8)&0xFF00FF00FF00FF00ULL) | ((x>> 8)&0x00FF00FF00FF00FFULL);
x= ((x<<16)&0xFFFF0000FFFF0000ULL) | ((x>>16)&0x0000FFFF0000FFFFULL);
return (x>>32) | (x<<32);
#elif defined(ARCH_X86_64)
__asm("bswap %0":
"=r" (x) :
"0" (x));
return x;
#else
union {
uint64_t ll;
uint32_t l[2];
} w, r;
w.ll = x;
r.l[0] = bswap_32 (w.l[1]);
r.l[1] = bswap_32 (w.l[0]);
return r.ll;
#endif
}
#endif /* !HAVE_BYTESWAP_H */
#endif /* BSWAP_H_INCLUDED */
|
