mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
92 lines
2.0 KiB
C
92 lines
2.0 KiB
C
#ifndef __BSWAP_H__
|
|
#define __BSWAP_H__
|
|
|
|
#ifdef HAVE_BYTESWAP_H
|
|
#include <byteswap.h>
|
|
#else
|
|
|
|
#ifdef ARCH_X86
|
|
inline static unsigned short ByteSwap16(unsigned short x)
|
|
{
|
|
__asm("xchgb %b0,%h0" :
|
|
"=q" (x) :
|
|
"0" (x));
|
|
return x;
|
|
}
|
|
#define bswap_16(x) ByteSwap16(x)
|
|
|
|
inline static unsigned int ByteSwap32(unsigned int x)
|
|
{
|
|
#if __CPU__ > 386
|
|
__asm("bswap %0":
|
|
"=r" (x) :
|
|
#else
|
|
__asm("xchgb %b0,%h0\n"
|
|
" rorl $16,%0\n"
|
|
" xchgb %b0,%h0":
|
|
"=q" (x) :
|
|
#endif
|
|
"0" (x));
|
|
return x;
|
|
}
|
|
#define bswap_32(x) ByteSwap32(x)
|
|
|
|
inline static unsigned long long int ByteSwap64(unsigned long long int x)
|
|
{
|
|
register union { __extension__ uint64_t __ll;
|
|
uint32_t __l[2]; } __x;
|
|
asm("xchgl %0,%1":
|
|
"=r"(__x.__l[0]),"=r"(__x.__l[1]):
|
|
"0"(bswap_32((unsigned long)x)),"1"(bswap_32((unsigned long)(x>>32))));
|
|
return __x.__ll;
|
|
}
|
|
#define bswap_64(x) ByteSwap64(x)
|
|
|
|
#else
|
|
|
|
#define bswap_16(x) (((x) & 0x00ff) << 8 | ((x) & 0xff00) >> 8)
|
|
|
|
|
|
// code from bits/byteswap.h (C) 1997, 1998 Free Software Foundation, Inc.
|
|
#define bswap_32(x) \
|
|
((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
|
|
(((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
|
|
|
|
inline static uint64_t ByteSwap64(uint64_t x)
|
|
{
|
|
union {
|
|
uint64_t ll;
|
|
uint32_t l[2];
|
|
} w, r;
|
|
w.ll = x;
|
|
r.l[0] = bswap_32 (w.l[1]);
|
|
r.l[1] = bswap_32 (w.l[0]);
|
|
return r.ll;
|
|
}
|
|
#define bswap_64(x) ByteSwap64(x)
|
|
|
|
#endif /* !ARCH_X86 */
|
|
|
|
#endif /* !HAVE_BYTESWAP_H */
|
|
|
|
// be2me ... BigEndian to MachineEndian
|
|
// le2me ... LittleEndian to MachineEndian
|
|
|
|
#ifdef WORDS_BIGENDIAN
|
|
#define be2me_16(x) (x)
|
|
#define be2me_32(x) (x)
|
|
#define be2me_64(x) (x)
|
|
#define le2me_16(x) bswap_16(x)
|
|
#define le2me_32(x) bswap_32(x)
|
|
#define le2me_64(x) bswap_64(x)
|
|
#else
|
|
#define be2me_16(x) bswap_16(x)
|
|
#define be2me_32(x) bswap_32(x)
|
|
#define be2me_64(x) bswap_64(x)
|
|
#define le2me_16(x) (x)
|
|
#define le2me_32(x) (x)
|
|
#define le2me_64(x) (x)
|
|
#endif
|
|
|
|
#endif /* __BSWAP_H__ */
|