apps/codecs/libwmapro/libavutil/bswap.h

   1 /*
   2  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 libavutil/bswap.h
  23  * byte swapping routines
  24  */
  25
  26 #ifndef AVUTIL_BSWAP_H
  27 #define AVUTIL_BSWAP_H
  28
  29 #include <stdint.h>
  30 //#include "config.h"
  31
  32 #ifndef bswap_16
  33 static inline uint16_t bswap_16(uint16_t x)
  34 {
  35     x= (x>>8) | (x<<8);
  36     return x;
  37 }
  38 #endif
  39
  40 #ifndef bswap_32
  41 static inline uint32_t bswap_32(uint32_t x)
  42 {
  43     x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
  44     x= (x>>16) | (x<<16);
  45     return x;
  46 }
  47 #endif
  48
  49 #ifndef bswap_64
  50 static inline uint64_t bswap_64(uint64_t x)
  51 {
  52 #if 0
  53     x= ((x<< 8)&0xFF00FF00FF00FF00ULL) | ((x>> 8)&0x00FF00FF00FF00FFULL);
  54     x= ((x<<16)&0xFFFF0000FFFF0000ULL) | ((x>>16)&0x0000FFFF0000FFFFULL);
  55     return (x>>32) | (x<<32);
  56 #else
  57     union {
  58         uint64_t ll;
  59         uint32_t l[2];
  60     } w, r;
  61     w.ll = x;
  62     r.l[0] = bswap_32 (w.l[1]);
  63     r.l[1] = bswap_32 (w.l[0]);
  64     return r.ll;
  65 #endif
  66 }
  67 #endif
  68
  69 // be2me ... big-endian to machine-endian
  70 // le2me ... little-endian to machine-endian
  71
  72 #define HAVE_BIGENDIAN 0
  73 #if HAVE_BIGENDIAN
  74 #define be2me_16(x) (x)
  75 #define be2me_32(x) (x)
  76 #define be2me_64(x) (x)
  77 #define le2me_16(x) bswap_16(x)
  78 #define le2me_32(x) bswap_32(x)
  79 #define le2me_64(x) bswap_64(x)
  80 #else
  81 #define be2me_16(x) bswap_16(x)
  82 #define be2me_32(x) bswap_32(x)
  83 #define be2me_64(x) bswap_64(x)
  84 #define le2me_16(x) (x)
  85 #define le2me_32(x) (x)
  86 #define le2me_64(x) (x)
  87 #endif
  88
  89 #endif /* AVUTIL_BSWAP_H */