text: /*
   * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
   *
   * This inFile is part of FFmpeg.
   *
   * FFmpeg is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * FFmpeg is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with FFmpeg; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  /**
   * @file
   * byte swapping routines
   */
  
  #ifndef AVUTIL_BSWAP_H
  #define AVUTIL_BSWAP_H
  
  #include <stdint.h>
  #include "libavutil/avconfig.h"
  #include "attributes.h"
  
  #ifdef HAVE_AV_CONFIG_H
  
  #include "config.h"
  
  #if   ARCH_AARCH64
  #   include "aarch64/bswap.h"
  #elif ARCH_ARM
  #   include "arm/bswap.h"
  #elif ARCH_AVR32
  #   include "avr32/bswap.h"
  #elif ARCH_SH4
  #   include "sh4/bswap.h"
  #elif ARCH_X86
  #   include "x86/bswap.h"
  #endif
  
  #endif /* HAVE_AV_CONFIG_H */
  
  #define AV_BSWAP16C(x) (((x) << 8 & 0xff00)  | ((x) >> 8 & 0x00ff))
  #define AV_BSWAP32C(x) (AV_BSWAP16C(x) << 16 | AV_BSWAP16C((x) >> 16))
  #define AV_BSWAP64C(x) (AV_BSWAP32C(x) << 32 | AV_BSWAP32C((x) >> 32))
  
  #define AV_BSWAPC(s, x) AV_BSWAP##s##C(x)
  
  #ifndef av_bswap16
  static av_always_inline av_const uint16_t av_bswap16(uint16_t x)
  {
      x= (x>>8) | (x<<8);
      return x;
  }
  #endif
  
  #ifndef av_bswap32
  static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
  {
      return AV_BSWAP32C(x);
  }
  #endif
  
  #ifndef av_bswap64
  static inline uint64_t av_const av_bswap64(uint64_t x)
  {
      return (uint64_t)av_bswap32(x) << 32 | av_bswap32(x >> 32);
  }
  #endif
  
  // be2ne ... big-endian to native-endian
  // le2ne ... little-endian to native-endian
  
  #if AV_HAVE_BIGENDIAN
  #define av_be2ne16(x) (x)
  #define av_be2ne32(x) (x)
  #define av_be2ne64(x) (x)
  #define av_le2ne16(x) av_bswap16(x)
  #define av_le2ne32(x) av_bswap32(x)
  #define av_le2ne64(x) av_bswap64(x)
  #define AV_BE2NEC(s, x) (x)
  #define AV_LE2NEC(s, x) AV_BSWAPC(s, x)
  #else
  #define av_be2ne16(x) av_bswap16(x)
  #define av_be2ne32(x) av_bswap32(x)
  #define av_be2ne64(x) av_bswap64(x)
  #define av_le2ne16(x) (x)
  #define av_le2ne32(x) (x)
  #define av_le2ne64(x) (x)
  #define AV_BE2NEC(s, x) AV_BSWAPC(s, x)
  #define AV_LE2NEC(s, x) (x)
  #endif
  
  #define AV_BE2NE16C(x) AV_BE2NEC(16, x)
  #define AV_BE2NE32C(x) AV_BE2NEC(32, x)
  #define AV_BE2NE64C(x) AV_BE2NEC(64, x)
  #define AV_LE2NE16C(x) AV_LE2NEC(16, x)
  #define AV_LE2NE32C(x) AV_LE2NEC(32, x)
  #define AV_LE2NE64C(x) AV_LE2NEC(64, x)
  
  #endif /* AVUTIL_BSWAP_H */
  