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Add a macro to pack 4 bytes into native byte-order so they can be written

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at once using a single 32-bit store.

Originally committed as revision 23715 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ronald S. Bultje 2010-06-22 19:15:27 +00:00
parent caaf098cec
commit b39a2d19d4
1 changed files with 8 additions and 0 deletions
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8
libavcodec/mathops.h
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@ -146,5 +146,13 @@ if ((y) < (x)) {\
# define NEG_USR32(a,s) (((uint32_t)(a))>>(32-(s))) # define NEG_USR32(a,s) (((uint32_t)(a))>>(32-(s)))
#endif #endif
#ifndef PACK4x8
# if HAVE_BIGENDIAN
# define PACK4x8(a,b,c,d) (((a) << 24) | ((b) << 16) | ((c) << 8) | (d))
# else
# define PACK4x8(a,b,c,d) (((d) << 24) | ((c) << 16) | ((b) << 8) | (a))
# endif
#endif
#endif /* AVCODEC_MATHOPS_H */ #endif /* AVCODEC_MATHOPS_H */