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author Nina Engelhardt <nengel@mailbox.tu-berlin.de>
date Tue, 13 Aug 2013 13:12:57 +0200
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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
21 /**
22 * @file
23 * byte swapping routines
24 */
25
26 #ifndef AVUTIL_BSWAP_H
27 #define AVUTIL_BSWAP_H
28
29 #include <stdint.h>
30 #include "config.h"
31 #include "attributes.h"
32
33 #if ARCH_ARM
34 # include "arm/bswap.h"
35 #elif ARCH_X86
36 # include "x86/bswap.h"
37 #endif
38
39 #ifndef bswap_16
40 static av_always_inline av_const uint16_t bswap_16(uint16_t x)
41 {
42 x= (x>>8) | (x<<8);
43 return x;
44 }
45 #endif
46
47 #ifndef bswap_32
48 static av_always_inline av_const uint32_t bswap_32(uint32_t x)
49 {
50 x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
51 x= (x>>16) | (x<<16);
52 return x;
53 }
54 #endif
55
56 #ifndef bswap_64
57 static inline uint64_t av_const bswap_64(uint64_t x)
58 {
59 #if 0
60 x= ((x<< 8)&0xFF00FF00FF00FF00ULL) | ((x>> 8)&0x00FF00FF00FF00FFULL);
61 x= ((x<<16)&0xFFFF0000FFFF0000ULL) | ((x>>16)&0x0000FFFF0000FFFFULL);
62 return (x>>32) | (x<<32);
63 #else
64 union {
65 uint64_t ll;
66 uint32_t l[2];
67 } w, r;
68 w.ll = x;
69 r.l[0] = bswap_32 (w.l[1]);
70 r.l[1] = bswap_32 (w.l[0]);
71 return r.ll;
72 #endif
73 }
74 #endif
75
76 // be2me ... big-endian to machine-endian
77 // le2me ... little-endian to machine-endian
78
79 #if HAVE_BIGENDIAN
80 #define be2me_16(x) (x)
81 #define be2me_32(x) (x)
82 #define be2me_64(x) (x)
83 #define le2me_16(x) bswap_16(x)
84 #define le2me_32(x) bswap_32(x)
85 #define le2me_64(x) bswap_64(x)
86 #else
87 #define be2me_16(x) bswap_16(x)
88 #define be2me_32(x) bswap_32(x)
89 #define be2me_64(x) bswap_64(x)
90 #define le2me_16(x) (x)
91 #define le2me_32(x) (x)
92 #define le2me_64(x) (x)
93 #endif
94
95 #endif /* AVUTIL_BSWAP_H */