xine-lib: xine-lib-1.2.12/src/xine-engine/ffmpeg_bswap.h Source File

xine-lib 1.2.12

ffmpeg_bswap.h
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1/*
2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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
26#ifndef __FFMPEG_BSWAP_H__
27#define __FFMPEG_BSWAP_H__
28
29#ifdef HAVE_BYTESWAP_H
30#include <byteswap.h>
31#else
32
33#if defined(ARCH_X86_X32) || defined(ARCH_X86_64)
34# define LEGACY_REGS "=Q"
35#else
36# define LEGACY_REGS "=q"
37#endif
38
39#if defined(ARCH_X86)
40static always_inline uint16_t bswap_16(uint16_t x)
41{
42 __asm("rorw $8, %0" :
43 LEGACY_REGS (x) :
44 "0" (x));
45 return x;
46}
47
48static always_inline uint32_t bswap_32(uint32_t x)
49{
50#if __CPU__ != 386
51 __asm("bswap %0":
52 "=r" (x) :
53#else
54 __asm("xchgb %b0,%h0\n"
55 " rorl $16,%0\n"
56 " xchgb %b0,%h0":
57 LEGACY_REGS (x) :
58#endif
59 "0" (x));
60 return x;
61}
62
63static inline uint64_t bswap_64(uint64_t x)
64{
65#if defined(ARCH_X86_X32) || defined(ARCH_X86_64)
66 __asm("bswap %0":
67 "=r" (x) :
68 "0" (x));
69 return x;
70#else
71 union {
72 uint64_t ll;
73 struct {
74 uint32_t l,h;
75 } l;
76 } r;
77 r.l.l = bswap_32 (x);
78 r.l.h = bswap_32 (x>>32);
79 return r.ll;
80#endif
81}
82
83#elif defined(ARCH_SH4)
84
85static always_inline uint16_t bswap_16(uint16_t x) {
86 __asm__("swap.b %0,%0":"=r"(x):"0"(x));
87 return x;
88}
89
90static always_inline uint32_t bswap_32(uint32_t x) {
91 __asm__(
92 "swap.b %0,%0\n"
93 "swap.w %0,%0\n"
94 "swap.b %0,%0\n"
95 :"=r"(x):"0"(x));
96 return x;
97}
98
99static inline uint64_t bswap_64(uint64_t x)
100{
101 union {
102 uint64_t ll;
103 struct {
104 uint32_t l,h;
105 } l;
106 } r;
107 r.l.l = bswap_32 (x);
108 r.l.h = bswap_32 (x>>32);
109 return r.ll;
110}
111#else
112
113 static always_inline uint16_t bswap_16(uint16_t x){
114 return (x>>8) | (x<<8);
115}
116
117#ifdef ARCH_ARM
118static always_inline uint32_t bswap_32(uint32_t x){
119 uint32_t t;
120 __asm__ (
121 "eor %1, %0, %0, ror #16 \n\t"
122 "bic %1, %1, #0xFF0000 \n\t"
123 "mov %0, %0, ror #8 \n\t"
124 "eor %0, %0, %1, lsr #8 \n\t"
125 : "+r"(x), "+r"(t));
126 return x;
127}
128#else
129 static always_inline uint32_t bswap_32(uint32_t x){
130 x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
131 return (x>>16) | (x<<16);
132}
133#endif
134
135 static inline uint64_t bswap_64(uint64_t x)
136{
137#if 0
138 x= ((x<< 8)&0xFF00FF00FF00FF00ULL) | ((x>> 8)&0x00FF00FF00FF00FFULL);
139 x= ((x<<16)&0xFFFF0000FFFF0000ULL) | ((x>>16)&0x0000FFFF0000FFFFULL);
140 return (x>>32) | (x<<32);
141#else
142 union {
143 uint64_t ll;
144 uint32_t l[2];
145 } w, r;
146 w.ll = x;
147 r.l[0] = bswap_32 (w.l[1]);
148 r.l[1] = bswap_32 (w.l[0]);
149 return r.ll;
150#endif
151}
152#endif /* !ARCH_X86 */
153
154#endif /* !HAVE_BYTESWAP_H */
155
156// be2me ... BigEndian to MachineEndian
157// le2me ... LittleEndian to MachineEndian
158
159#ifdef WORDS_BIGENDIAN
160#define be2me_16(x) (x)
161#define be2me_32(x) (x)
162#define be2me_64(x) (x)
163#define le2me_16(x) bswap_16(x)
164#define le2me_32(x) bswap_32(x)
165#define le2me_64(x) bswap_64(x)
166#else
167#define be2me_16(x) bswap_16(x)
168#define be2me_32(x) bswap_32(x)
169#define be2me_64(x) bswap_64(x)
170#define le2me_16(x) (x)
171#define le2me_32(x) (x)
172#define le2me_64(x) (x)
173#endif
174
175#endif /* __BSWAP_H__ */
always_inline
#define always_inline
Definition: bswap.h:28
bswap_64
static uint64_t bswap_64(uint64_t x)
Definition: ffmpeg_bswap.h:135
bswap_32
static always_inline uint32_t bswap_32(uint32_t x)
Definition: ffmpeg_bswap.h:129
bswap_16
static always_inline uint16_t bswap_16(uint16_t x)
Definition: ffmpeg_bswap.h:113
LEGACY_REGS
#define LEGACY_REGS
Definition: ffmpeg_bswap.h:36