diff options
Diffstat (limited to 'libavutil/common.h')
| -rw-r--r-- | libavutil/common.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/libavutil/common.h b/libavutil/common.h index eb40e12990..3265f9cca4 100644 --- a/libavutil/common.h +++ b/libavutil/common.h @@ -153,6 +153,20 @@ static av_always_inline av_const int32_t av_clipl_int32_c(int64_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 * @param p bit position to clip at @@ -386,6 +400,9 @@ 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 |