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Add av_clip_uintp2() function

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Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard
2011-05-13 16:39:17 +01:00
committed by Ronald S. Bultje
parent 2c9a5172d3
commit 1550f45a89
2 changed files with 16 additions and 3 deletions
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15
libavutil/common.h
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@@ -169,6 +169,18 @@ static av_always_inline av_const int32_t av_clipl_int32_c(int64_t a)
else return a;
}
/**
* Clip a signed integer to an unsigned power of two range.
* @param a value to clip
* @param p bit position to clip at
* @return clipped value
*/
static av_always_inline av_const unsigned av_clip_uintp2_c(int a, int p)
{
if (a & ~((1<<p) - 1)) return -a >> 31 & ((1<<p) - 1);
else return a;
}
/**
* Clip a float value into the amin-amax range.
* @param a value to clip
@@ -362,6 +374,9 @@ static av_always_inline av_const int av_popcount_c(uint32_t x)
#ifndef av_clipl_int32
# define av_clipl_int32 av_clipl_int32_c
#endif
#ifndef av_clip_uintp2
# define av_clip_uintp2 av_clip_uintp2_c
#endif
#ifndef av_clipf
# define av_clipf av_clipf_c
#endif