misc/winutils/include/libavutil/bswap.h
changeset 7813 7ac83d79b897
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7812:00696c1450da 7813:7ac83d79b897
       
     1 /*
       
     2  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
       
     3  *
       
     4  * This file is part of Libav.
       
     5  *
       
     6  * Libav 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  * Libav 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 Libav; 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_ARM
       
    38 #   include "arm/bswap.h"
       
    39 #elif ARCH_AVR32
       
    40 #   include "avr32/bswap.h"
       
    41 #elif ARCH_BFIN
       
    42 #   include "bfin/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 */