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FFmpeg/libavcodec/bswap.h

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  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 ARCH_X86

  14. static inline unsigned short ByteSwap16(unsigned short x)

  15. {

  16.   __asm("xchgb %b0,%h0"	:

  17.         "=q" (x)	:

  18.         "0" (x));

  19.     return x;

  20. }

  21. #define bswap_16(x) ByteSwap16(x)

  22. 

  23. static inline unsigned int ByteSwap32(unsigned int x)

  24. {

  25. #if __CPU__ > 386

  26.  __asm("bswap	%0":

  27.       "=r" (x)     :

  28. #else

  29.  __asm("xchgb	%b0,%h0\n"

  30.       "	rorl	$16,%0\n"

  31.       "	xchgb	%b0,%h0":

  32.       "=q" (x)		:

  33. #endif

  34.       "0" (x));

  35.   return x;

  36. }

  37. #define bswap_32(x) ByteSwap32(x)

  38. 

  39. static inline unsigned long long int ByteSwap64(unsigned long long int x)

  40. {

  41.   register union { __extension__ uint64_t __ll;

  42.           uint32_t __l[2]; } __x;

  43.   asm("xchgl	%0,%1":

  44.       "=r"(__x.__l[0]),"=r"(__x.__l[1]):

  45.       "0"(bswap_32((unsigned long)x)),"1"(bswap_32((unsigned long)(x>>32))));

  46.   return __x.__ll;

  47. }

  48. #define bswap_64(x) ByteSwap64(x)

  49. 

  50. #elif defined(ARCH_SH4)

  51. 

  52. static inline uint16_t ByteSwap16(uint16_t x) {

  53. 	__asm__("swap.b %0,%0":"=r"(x):"0"(x));

  54. 	return x;

  55. }

  56. 

  57. static inline uint32_t ByteSwap32(uint32_t x) {

  58. 	__asm__(

  59. 	"swap.b %0,%0\n"

  60. 	"swap.w %0,%0\n"

  61. 	"swap.b %0,%0\n"

  62. 	:"=r"(x):"0"(x));

  63. 	return x;

  64. }

  65. 

  66. #define bswap_16(x) ByteSwap16(x)

  67. #define bswap_32(x) ByteSwap32(x)

  68. 

  69. static inline uint64_t ByteSwap64(uint64_t x)

  70. {

  71.     union { 

  72.         uint64_t ll;

  73.         struct {

  74.            uint32_t l,h;

  75.         } l;

  76.     } r;

  77.     r.l.l = bswap_32 (x);

  78.     r.l.h = bswap_32 (x>>32);

  79.     return r.ll;

  80. }

  81. #define bswap_64(x) ByteSwap64(x)

  82. 

  83. #else

  84. 

  85. #define bswap_16(x) (((x) & 0x00ff) << 8 | ((x) & 0xff00) >> 8)

  86. 			

  87. 

  88. // code from bits/byteswap.h (C) 1997, 1998 Free Software Foundation, Inc.

  89. #define bswap_32(x) \

  90.      ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >>  8) | \

  91.       (((x) & 0x0000ff00) <<  8) | (((x) & 0x000000ff) << 24))

  92. 

  93. static inline uint64_t ByteSwap64(uint64_t x)

  94. {

  95.     union { 

  96.         uint64_t ll;

  97.         uint32_t l[2]; 

  98.     } w, r;

  99.     w.ll = x;

  100.     r.l[0] = bswap_32 (w.l[1]);

  101.     r.l[1] = bswap_32 (w.l[0]);

  102.     return r.ll;

  103. }

  104. #define bswap_64(x) ByteSwap64(x)

  105. 

  106. #endif	/* !ARCH_X86 */

  107. 

  108. #endif	/* !HAVE_BYTESWAP_H */

  109. 

  110. // be2me ... BigEndian to MachineEndian

  111. // le2me ... LittleEndian to MachineEndian

  112. 

  113. #ifdef WORDS_BIGENDIAN

  114. #define be2me_16(x) (x)

  115. #define be2me_32(x) (x)

  116. #define be2me_64(x) (x)

  117. #define le2me_16(x) bswap_16(x)

  118. #define le2me_32(x) bswap_32(x)

  119. #define le2me_64(x) bswap_64(x)

  120. #else

  121. #define be2me_16(x) bswap_16(x)

  122. #define be2me_32(x) bswap_32(x)

  123. #define be2me_64(x) bswap_64(x)

  124. #define le2me_16(x) (x)

  125. #define le2me_32(x) (x)

  126. #define le2me_64(x) (x)

  127. #endif

  128. 

  129. #endif /* __BSWAP_H__ */