apps/codecs/lib/ffmpeg_bswap.h

   1 /**
   2  * @file bswap.h
   3  * byte swap.
   4  */
   5
   6 #ifndef __BSWAP_H__
   7 #define __BSWAP_H__
   8
   9 #ifdef HAVE_BYTESWAP_H
  10 #include <byteswap.h>
  11 #else
  12
  13 #ifdef ROCKBOX
  14 #include "codecs.h"
  15
  16 /* rockbox' optimised inline functions */
  17 #define bswap_16(x) swap16(x)
  18 #define bswap_32(x) swap32(x)
  19
  20 static inline uint64_t ByteSwap64(uint64_t x)
  21 {
  22     union {
  23         uint64_t ll;
  24         struct {
  25            uint32_t l,h;
  26         } l;
  27     } r;
  28     r.l.l = bswap_32 (x);
  29     r.l.h = bswap_32 (x>>32);
  30     return r.ll;
  31 }
  32 #define bswap_64(x) ByteSwap64(x)
  33
  34 #elif defined(ARCH_X86)
  35 static inline unsigned short ByteSwap16(unsigned short x)
  36 {
  37   __asm("xchgb %b0,%h0" :
  38         "=q" (x)        :
  39         "0" (x));
  40     return x;
  41 }
  42 #define bswap_16(x) ByteSwap16(x)
  43
  44 static inline unsigned int ByteSwap32(unsigned int x)
  45 {
  46 #if __CPU__ > 386
  47  __asm("bswap   %0":
  48       "=r" (x)     :
  49 #else
  50  __asm("xchgb   %b0,%h0\n"
  51       " rorl    $16,%0\n"
  52       " xchgb   %b0,%h0":
  53       "=q" (x)          :
  54 #endif
  55       "0" (x));
  56   return x;
  57 }
  58 #define bswap_32(x) ByteSwap32(x)
  59
  60 static inline unsigned long long int ByteSwap64(unsigned long long int x)
  61 {
  62   register union { __extension__ uint64_t __ll;
  63           uint32_t __l[2]; } __x;
  64   asm("xchgl    %0,%1":
  65       "=r"(__x.__l[0]),"=r"(__x.__l[1]):
  66       "0"(bswap_32((unsigned long)x)),"1"(bswap_32((unsigned long)(x>>32))));
  67   return __x.__ll;
  68 }
  69 #define bswap_64(x) ByteSwap64(x)
  70
  71 #elif defined(ARCH_SH4)
  72
  73 static inline uint16_t ByteSwap16(uint16_t x) {
  74         __asm__("swap.b %0,%0":"=r"(x):"0"(x));
  75         return x;
  76 }
  77
  78 static inline uint32_t ByteSwap32(uint32_t x) {
  79         __asm__(
  80         "swap.b %0,%0\n"
  81         "swap.w %0,%0\n"
  82         "swap.b %0,%0\n"
  83         :"=r"(x):"0"(x));
  84         return x;
  85 }
  86
  87 #define bswap_16(x) ByteSwap16(x)
  88 #define bswap_32(x) ByteSwap32(x)
  89
  90 static inline uint64_t ByteSwap64(uint64_t x)
  91 {
  92     union {
  93         uint64_t ll;
  94         struct {
  95            uint32_t l,h;
  96         } l;
  97     } r;
  98     r.l.l = bswap_32 (x);
  99     r.l.h = bswap_32 (x>>32);
 100     return r.ll;
 101 }
 102 #define bswap_64(x) ByteSwap64(x)
 103
 104 #else
 105
 106 #define bswap_16(x) (((x) & 0x00ff) << 8 | ((x) & 0xff00) >> 8)
 107
 108
 109 // code from bits/byteswap.h (C) 1997, 1998 Free Software Foundation, Inc.
 110 #define bswap_32(x) \
 111      ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >>  8) | \
 112       (((x) & 0x0000ff00) <<  8) | (((x) & 0x000000ff) << 24))
 113
 114 static inline uint64_t ByteSwap64(uint64_t x)
 115 {
 116     union {
 117         uint64_t ll;
 118         uint32_t l[2];
 119     } w, r;
 120     w.ll = x;
 121     r.l[0] = bswap_32 (w.l[1]);
 122     r.l[1] = bswap_32 (w.l[0]);
 123     return r.ll;
 124 }
 125 #define bswap_64(x) ByteSwap64(x)
 126
 127 #endif  /* !ARCH_X86 */
 128
 129 #endif  /* !HAVE_BYTESWAP_H */
 130
 131 // be2me ... BigEndian to MachineEndian
 132 // le2me ... LittleEndian to MachineEndian
 133
 134 #ifdef ROCKBOX_BIG_ENDIAN
 135 #define be2me_16(x) (x)
 136 #define be2me_32(x) (x)
 137 #define be2me_64(x) (x)
 138 #define le2me_16(x) bswap_16(x)
 139 #define le2me_32(x) bswap_32(x)
 140 #define le2me_64(x) bswap_64(x)
 141 #else
 142 #define be2me_16(x) bswap_16(x)
 143 #define be2me_32(x) bswap_32(x)
 144 #define be2me_64(x) bswap_64(x)
 145 #define le2me_16(x) (x)
 146 #define le2me_32(x) (x)
 147 #define le2me_64(x) (x)
 148 #endif
 149
 150 #endif /* __BSWAP_H__ */