ffmpeg/libavutil/bswap.h

   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 "libavutil/avconfig.h"
  31 #include "attributes.h"
  32
  33 #ifdef HAVE_AV_CONFIG_H
  34
  35 #include "config.h"
  36
  37 #if   ARCH_AARCH64
  38 #   include "aarch64/bswap.h"
  39 #elif ARCH_ARM
  40 #   include "arm/bswap.h"
  41 #elif ARCH_AVR32
  42 #   include "avr32/bswap.h"
  43 #elif ARCH_SH4
  44 #   include "sh4/bswap.h"
  45 #elif ARCH_X86
  46 #   include "x86/bswap.h"
  47 #endif
  48
  49 #endif /* HAVE_AV_CONFIG_H */
  50
  51 #define AV_BSWAP16C(x) (((x) << 8 & 0xff00)  | ((x) >> 8 & 0x00ff))
  52 #define AV_BSWAP32C(x) (AV_BSWAP16C(x) << 16 | AV_BSWAP16C((x) >> 16))
  53 #define AV_BSWAP64C(x) (AV_BSWAP32C(x) << 32 | AV_BSWAP32C((x) >> 32))
  54
  55 #define AV_BSWAPC(s, x) AV_BSWAP##s##C(x)
  56
  57 #ifndef av_bswap16
  58 static av_always_inline av_const uint16_t av_bswap16(uint16_t x)
  59 {
  60     x= (x>>8) | (x<<8);
  61     return x;
  62 }
  63 #endif
  64
  65 #ifndef av_bswap32
  66 static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
  67 {
  68     return AV_BSWAP32C(x);
  69 }
  70 #endif
  71
  72 #ifndef av_bswap64
  73 static inline uint64_t av_const av_bswap64(uint64_t x)
  74 {
  75     return (uint64_t)av_bswap32(x) << 32 | av_bswap32(x >> 32);
  76 }
  77 #endif
  78
  79 // be2ne ... big-endian to native-endian
  80 // le2ne ... little-endian to native-endian
  81
  82 #if AV_HAVE_BIGENDIAN
  83 #define av_be2ne16(x) (x)
  84 #define av_be2ne32(x) (x)
  85 #define av_be2ne64(x) (x)
  86 #define av_le2ne16(x) av_bswap16(x)
  87 #define av_le2ne32(x) av_bswap32(x)
  88 #define av_le2ne64(x) av_bswap64(x)
  89 #define AV_BE2NEC(s, x) (x)
  90 #define AV_LE2NEC(s, x) AV_BSWAPC(s, x)
  91 #else
  92 #define av_be2ne16(x) av_bswap16(x)
  93 #define av_be2ne32(x) av_bswap32(x)
  94 #define av_be2ne64(x) av_bswap64(x)
  95 #define av_le2ne16(x) (x)
  96 #define av_le2ne32(x) (x)
  97 #define av_le2ne64(x) (x)
  98 #define AV_BE2NEC(s, x) AV_BSWAPC(s, x)
  99 #define AV_LE2NEC(s, x) (x)
 100 #endif
 101
 102 #define AV_BE2NE16C(x) AV_BE2NEC(16, x)
 103 #define AV_BE2NE32C(x) AV_BE2NEC(32, x)
 104 #define AV_BE2NE64C(x) AV_BE2NEC(64, x)
 105 #define AV_LE2NE16C(x) AV_LE2NEC(16, x)
 106 #define AV_LE2NE32C(x) AV_LE2NEC(32, x)
 107 #define AV_LE2NE64C(x) AV_LE2NEC(64, x)
 108
 109 #endif /* AVUTIL_BSWAP_H */