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Merge commit 'bf07d813f6c88b5a76980f321cf7272d799c4216' 

* commit 'bf07d813f6c88b5a76980f321cf7272d799c4216':
  libavutil: Add av_clip_intp2

Merged-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-02-21 11:02:17 +01:00
parent 3fdcb8ccdc bf07d813f6
commit 88d850ecb3
1 changed files with 17 additions and 0 deletions
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17
libavutil/common.h
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@ -184,6 +184,20 @@ static av_always_inline av_const int32_t av_clipl_int32_c(int64_t a)
else return (int32_t)a;
}
/**
* Clip a signed integer into the -(2^p),(2^p-1) range.
* @param a value to clip
* @param p bit position to clip at
* @return clipped value
*/
static av_always_inline av_const int av_clip_intp2_c(int a, int p)
{
if ((a + (1 << p)) & ~((1 << (p + 1)) - 1))
return (a >> 31) ^ ((1 << p) - 1);
else
return a;
}
/**
* Clip a signed integer to an unsigned power of two range.
* @param a value to clip
@ -446,6 +460,9 @@ static av_always_inline av_const int av_popcount64_c(uint64_t x)
#ifndef av_clipl_int32
# define av_clipl_int32 av_clipl_int32_c
#endif
#ifndef av_clip_intp2
# define av_clip_intp2 av_clip_intp2_c
#endif
#ifndef av_clip_uintp2
# define av_clip_uintp2 av_clip_uintp2_c
#endif