modules/codec/wmafixed/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 bswap.h
  23  * byte swap.
  24  */
  25
  26 #ifndef __BSWAP_H__
  27 #define __BSWAP_H__
  28
  29 #ifdef HAVE_BYTESWAP_H
  30 #include <byteswap.h>
  31 #else
  32
  33 #undef ROCKBOX
  34 #ifdef ROCKBOX
  35
  36 /* rockbox' optimised inline functions */
  37 #define bswap_16(x) swap16(x)
  38 #define bswap_32(x) swap32(x)
  39
  40 static inline uint64_t ByteSwap64(uint64_t x)
  41 {
  42     union {
  43         uint64_t ll;
  44         struct {
  45            uint32_t l,h;
  46         } l;
  47     } r;
  48     r.l.l = bswap_32 (x);
  49     r.l.h = bswap_32 (x>>32);
  50     return r.ll;
  51 }
  52 #define bswap_64(x) ByteSwap64(x)
  53
  54 #elif defined(ARCH_X86)
  55 static inline unsigned short ByteSwap16(unsigned short x)
  56 {
  57   __asm("xchgb %b0,%h0" :
  58         "=q" (x)        :
  59         "0" (x));
  60     return x;
  61 }
  62 #define bswap_16(x) ByteSwap16(x)
  63
  64 static inline unsigned int ByteSwap32(unsigned int x)
  65 {
  66 #if __CPU__ > 386
  67  __asm("bswap   %0":
  68       "=r" (x)     :
  69 #else
  70  __asm("xchgb   %b0,%h0\n"
  71       " rorl    $16,%0\n"
  72       " xchgb   %b0,%h0":
  73       "=q" (x)          :
  74 #endif
  75       "0" (x));
  76   return x;
  77 }
  78 #define bswap_32(x) ByteSwap32(x)
  79
  80 static inline unsigned long long int ByteSwap64(unsigned long long int x)
  81 {
  82   register union { __extension__ uint64_t __ll;
  83           uint32_t __l[2]; } __x;
  84   asm("xchgl    %0,%1":
  85       "=r"(__x.__l[0]),"=r"(__x.__l[1]):
  86       "0"(bswap_32((unsigned long)x)),"1"(bswap_32((unsigned long)(x>>32))));
  87   return __x.__ll;
  88 }
  89 #define bswap_64(x) ByteSwap64(x)
  90
  91 #elif defined(ARCH_SH4)
  92
  93 static inline uint16_t ByteSwap16(uint16_t x) {
  94         __asm__("swap.b %0,%0":"=r"(x):"0"(x));
  95         return x;
  96 }
  97
  98 static inline uint32_t ByteSwap32(uint32_t x) {
  99         __asm__(
 100         "swap.b %0,%0\n"
 101         "swap.w %0,%0\n"
 102         "swap.b %0,%0\n"
 103         :"=r"(x):"0"(x));
 104         return x;
 105 }
 106
 107 #define bswap_16(x) ByteSwap16(x)
 108 #define bswap_32(x) ByteSwap32(x)
 109
 110 static inline uint64_t ByteSwap64(uint64_t x)
 111 {
 112     union {
 113         uint64_t ll;
 114         struct {
 115            uint32_t l,h;
 116         } l;
 117     } r;
 118     r.l.l = bswap_32 (x);
 119     r.l.h = bswap_32 (x>>32);
 120     return r.ll;
 121 }
 122 #define bswap_64(x) ByteSwap64(x)
 123
 124 #else
 125
 126 #define bswap_16(x) (((x) & 0x00ff) << 8 | ((x) & 0xff00) >> 8)
 127
 128 // code from bits/byteswap.h (C) 1997, 1998 Free Software Foundation, Inc.
 129 #define bswap_32(x) \
 130      ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >>  8) | \
 131       (((x) & 0x0000ff00) <<  8) | (((x) & 0x000000ff) << 24))
 132
 133 static inline uint64_t ByteSwap64(uint64_t x)
 134 {
 135     union {
 136         uint64_t ll;
 137         uint32_t l[2];
 138     } w, r;
 139     w.ll = x;
 140     r.l[0] = bswap_32 (w.l[1]);
 141     r.l[1] = bswap_32 (w.l[0]);
 142     return r.ll;
 143 }
 144 #define bswap_64(x) ByteSwap64(x)
 145
 146 #endif  /* !ARCH_X86 */
 147
 148 #endif  /* !HAVE_BYTESWAP_H */
 149
 150 // be2me ... BigEndian to MachineEndian
 151 // le2me ... LittleEndian to MachineEndian
 152
 153 #ifdef WORDS_BIGENDIAN
 154 #define be2me_16(x) (x)
 155 #define be2me_32(x) (x)
 156 #define be2me_64(x) (x)
 157 #define le2me_16(x) bswap_16(x)
 158 #define le2me_32(x) bswap_32(x)
 159 #define le2me_64(x) bswap_64(x)
 160 #else
 161 #define be2me_16(x) bswap_16(x)
 162 #define be2me_32(x) bswap_32(x)
 163 #define be2me_64(x) bswap_64(x)
 164 #define le2me_16(x) (x)
 165 #define le2me_32(x) (x)
 166 #define le2me_64(x) (x)
 167 #endif
 168
 169 #endif /* __BSWAP_H__ */