moved in libavcodec

Originally committed as revision 594 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 86 insertions, 0 deletions

diff --git a/libavcodec/bswap.h b/libavcodec/bswap.h
new file mode 100644
index 0000000000..af80e507f6
--- /dev/null
+++ b/libavcodec/bswap.h
@@ -0,0 +1,86 @@
+#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__ unsigned long long int __ll;
+          unsigned long int __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))
+
+#define bswap_64(x) \
+     (__extension__						\
+      ({ union { __extension__ unsigned long long int __ll;	\
+                 unsigned long int __l[2]; } __w, __r;		\
+         __w.__ll = (x);					\
+         __r.__l[0] = bswap_32 (__w.__l[1]);			\
+         __r.__l[1] = bswap_32 (__w.__l[0]);			\
+         __r.__ll; }))
+#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__ */