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Add av_clip_int8(), used in the upcoming VP8 decoder.

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Originally committed as revision 23713 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ronald S. Bultje 2010-06-22 19:11:33 +00:00
parent 890fe85f26
commit 45a1b86a05
1 changed files with 11 additions and 0 deletions
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11
libavutil/common.h
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@ -122,6 +122,17 @@ static inline av_const uint8_t av_clip_uint8(int a)
else return a; else return a;
} }
/**
* Clips a signed integer value into the -128,127 range.
* @param a value to clip
* @return clipped value
*/
static inline av_const int8_t av_clip_int8(int a)
{
if ((a+0x80) & ~0xFF) return (a>>31) ^ 0x7F;
else return a;
}
/** /**
* Clips a signed integer value into the 0-65535 range. * Clips a signed integer value into the 0-65535 range.
* @param a value to clip * @param a value to clip