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 */