ffmpeg_files/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 // This file in MPlayer is otherwise the same as in FFmpeg, except it
  23 // includes "libavutil/common.h" instead of "common.h".
  24
  25 /**
  26  * @file libavutil/bswap.h
  27  * byte swapping routines
  28  */
  29
  30 #ifndef MP_AVUTIL_BSWAP_H
  31 #define MP_AVUTIL_BSWAP_H
  32
  33 #include <stdint.h>
  34 #include "libavutil/common.h"
  35 #include "config.h"
  36
  37 #if   ARCH_ARM
  38 #   include "arm/bswap.h"
  39 #elif ARCH_BFIN
  40 #   include "bfin/bswap.h"
  41 #elif ARCH_SH4
  42 #   include "sh4/bswap.h"
  43 #elif ARCH_X86
  44 #   include "x86/bswap.h"
  45 #endif
  46
  47 #ifndef bswap_16
  48 static av_always_inline av_const uint16_t bswap_16(uint16_t x)
  49 {
  50     x= (x>>8) | (x<<8);
  51     return x;
  52 }
  53 #endif
  54
  55 #ifndef bswap_32
  56 static av_always_inline av_const uint32_t bswap_32(uint32_t x)
  57 {
  58     x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
  59     x= (x>>16) | (x<<16);
  60     return x;
  61 }
  62 #endif
  63
  64 #ifndef bswap_64
  65 static inline uint64_t av_const bswap_64(uint64_t x)
  66 {
  67 #if 0
  68     x= ((x<< 8)&0xFF00FF00FF00FF00ULL) | ((x>> 8)&0x00FF00FF00FF00FFULL);
  69     x= ((x<<16)&0xFFFF0000FFFF0000ULL) | ((x>>16)&0x0000FFFF0000FFFFULL);
  70     return (x>>32) | (x<<32);
  71 #else
  72     union {
  73         uint64_t ll;
  74         uint32_t l[2];
  75     } w, r;
  76     w.ll = x;
  77     r.l[0] = bswap_32 (w.l[1]);
  78     r.l[1] = bswap_32 (w.l[0]);
  79     return r.ll;
  80 #endif
  81 }
  82 #endif
  83
  84 // be2me ... big-endian to machine-endian
  85 // le2me ... little-endian to machine-endian
  86
  87 #ifdef WORDS_BIGENDIAN
  88 #define be2me_16(x) (x)
  89 #define be2me_32(x) (x)
  90 #define be2me_64(x) (x)
  91 #define le2me_16(x) bswap_16(x)
  92 #define le2me_32(x) bswap_32(x)
  93 #define le2me_64(x) bswap_64(x)
  94 #else
  95 #define be2me_16(x) bswap_16(x)
  96 #define be2me_32(x) bswap_32(x)
  97 #define be2me_64(x) bswap_64(x)
  98 #define le2me_16(x) (x)
  99 #define le2me_32(x) (x)
 100 #define le2me_64(x) (x)
 101 #endif
 102
 103 #endif /* AVUTIL_BSWAP_H */