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bswap.h (2897B)

      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_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_BFIN
     44 #   include "bfin/bswap.h"
     45 #elif ARCH_SH4
     46 #   include "sh4/bswap.h"
     47 #elif ARCH_X86
     48 #   include "x86/bswap.h"
     49 #endif
     50 
     51 #endif /* HAVE_AV_CONFIG_H */
     52 
     53 #define AV_BSWAP16C(x) (((x) << 8 & 0xff00)  | ((x) >> 8 & 0x00ff))
     54 #define AV_BSWAP32C(x) (AV_BSWAP16C(x) << 16 | AV_BSWAP16C((x) >> 16))
     55 #define AV_BSWAP64C(x) (AV_BSWAP32C(x) << 32 | AV_BSWAP32C((x) >> 32))
     56 
     57 #define AV_BSWAPC(s, x) AV_BSWAP##s##C(x)
     58 
     59 #ifndef av_bswap16
     60 static av_always_inline av_const uint16_t av_bswap16(uint16_t x)
     61 {
     62    x= (x>>8) | (x<<8);
     63    return x;
     64 }
     65 #endif
     66 
     67 #ifndef av_bswap32
     68 static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
     69 {
     70    return AV_BSWAP32C(x);
     71 }
     72 #endif
     73 
     74 #ifndef av_bswap64
     75 static inline uint64_t av_const av_bswap64(uint64_t x)
     76 {
     77    return (uint64_t)av_bswap32(x) << 32 | av_bswap32(x >> 32);
     78 }
     79 #endif
     80 
     81 // be2ne ... big-endian to native-endian
     82 // le2ne ... little-endian to native-endian
     83 
     84 #if AV_HAVE_BIGENDIAN
     85 #define av_be2ne16(x) (x)
     86 #define av_be2ne32(x) (x)
     87 #define av_be2ne64(x) (x)
     88 #define av_le2ne16(x) av_bswap16(x)
     89 #define av_le2ne32(x) av_bswap32(x)
     90 #define av_le2ne64(x) av_bswap64(x)
     91 #define AV_BE2NEC(s, x) (x)
     92 #define AV_LE2NEC(s, x) AV_BSWAPC(s, x)
     93 #else
     94 #define av_be2ne16(x) av_bswap16(x)
     95 #define av_be2ne32(x) av_bswap32(x)
     96 #define av_be2ne64(x) av_bswap64(x)
     97 #define av_le2ne16(x) (x)
     98 #define av_le2ne32(x) (x)
     99 #define av_le2ne64(x) (x)
    100 #define AV_BE2NEC(s, x) AV_BSWAPC(s, x)
    101 #define AV_LE2NEC(s, x) (x)
    102 #endif
    103 
    104 #define AV_BE2NE16C(x) AV_BE2NEC(16, x)
    105 #define AV_BE2NE32C(x) AV_BE2NEC(32, x)
    106 #define AV_BE2NE64C(x) AV_BE2NEC(64, x)
    107 #define AV_LE2NE16C(x) AV_LE2NEC(16, x)
    108 #define AV_LE2NE32C(x) AV_LE2NEC(32, x)
    109 #define AV_LE2NE64C(x) AV_LE2NEC(64, x)
    110 
    111 #endif /* AVUTIL_BSWAP_H */