Line data    Source code

       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           0 :     return AV_BSWAP32C(x);
      71             : }
      72             : #endif
      73             : 
      74             : #ifndef av_bswap64
      75           0 : static inline uint64_t av_const av_bswap64(uint64_t x)
      76             : {
      77           0 :     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 */