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2134
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1 /*
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2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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3 *
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4 * This file is part of FFmpeg.
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5 *
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6 * FFmpeg is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
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8 * License as published by the Free Software Foundation; either
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9 * version 2.1 of the License, or (at your option) any later version.
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10 *
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11 * FFmpeg is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * Lesser General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU Lesser General Public
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17 * License along with FFmpeg; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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19 */
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20
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21 /**
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22 * @file
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23 * byte swapping routines
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24 */
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25
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26 #ifndef AVUTIL_BSWAP_H
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27 #define AVUTIL_BSWAP_H
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28
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29 #include <stdint.h>
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30 #include "libavutil/avconfig.h"
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31 #include "attributes.h"
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32
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33 #ifdef HAVE_AV_CONFIG_H
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34
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35 #include "config.h"
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36
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37 #if ARCH_ARM
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38 # include "arm/bswap.h"
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39 #elif ARCH_AVR32
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40 # include "avr32/bswap.h"
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41 #elif ARCH_BFIN
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42 # include "bfin/bswap.h"
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43 #elif ARCH_SH4
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44 # include "sh4/bswap.h"
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45 #elif ARCH_X86
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46 # include "x86/bswap.h"
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47 #endif
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48
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49 #endif /* HAVE_AV_CONFIG_H */
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50
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51 #define AV_BSWAP16C(x) (((x) << 8 & 0xff00) | ((x) >> 8 & 0x00ff))
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52 #define AV_BSWAP32C(x) (AV_BSWAP16C(x) << 16 | AV_BSWAP16C((x) >> 16))
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53 #define AV_BSWAP64C(x) (AV_BSWAP32C(x) << 32 | AV_BSWAP32C((x) >> 32))
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54
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55 #define AV_BSWAPC(s, x) AV_BSWAP##s##C(x)
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56
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57 #ifndef av_bswap16
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58 static av_always_inline av_const uint16_t av_bswap16(uint16_t x)
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59 {
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60 x= (x>>8) | (x<<8);
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61 return x;
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62 }
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63 #endif
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64
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65 #ifndef av_bswap32
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66 static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
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67 {
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68 return AV_BSWAP32C(x);
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69 }
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70 #endif
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71
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72 #ifndef av_bswap64
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73 static inline uint64_t av_const av_bswap64(uint64_t x)
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74 {
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75 return (uint64_t)av_bswap32(x) << 32 | av_bswap32(x >> 32);
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76 }
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77 #endif
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78
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79 // be2ne ... big-endian to native-endian
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80 // le2ne ... little-endian to native-endian
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81
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82 #if AV_HAVE_BIGENDIAN
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83 #define av_be2ne16(x) (x)
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84 #define av_be2ne32(x) (x)
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85 #define av_be2ne64(x) (x)
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86 #define av_le2ne16(x) av_bswap16(x)
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87 #define av_le2ne32(x) av_bswap32(x)
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88 #define av_le2ne64(x) av_bswap64(x)
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89 #define AV_BE2NEC(s, x) (x)
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90 #define AV_LE2NEC(s, x) AV_BSWAPC(s, x)
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91 #else
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92 #define av_be2ne16(x) av_bswap16(x)
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93 #define av_be2ne32(x) av_bswap32(x)
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94 #define av_be2ne64(x) av_bswap64(x)
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95 #define av_le2ne16(x) (x)
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96 #define av_le2ne32(x) (x)
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97 #define av_le2ne64(x) (x)
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98 #define AV_BE2NEC(s, x) AV_BSWAPC(s, x)
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99 #define AV_LE2NEC(s, x) (x)
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100 #endif
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101
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102 #define AV_BE2NE16C(x) AV_BE2NEC(16, x)
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103 #define AV_BE2NE32C(x) AV_BE2NEC(32, x)
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104 #define AV_BE2NE64C(x) AV_BE2NEC(64, x)
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105 #define AV_LE2NE16C(x) AV_LE2NEC(16, x)
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106 #define AV_LE2NE32C(x) AV_LE2NEC(32, x)
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107 #define AV_LE2NE64C(x) AV_LE2NEC(64, x)
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108
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109 #endif /* AVUTIL_BSWAP_H */
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