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Add av_popcount() to libavutil/common.h and bump minor version

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Originally committed as revision 25120 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Tomas Härdin 2010-09-14 14:45:43 +00:00
parent 1d16a1cf99
commit bc6f0af289
2 changed files with 18 additions and 1 deletions
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2
libavutil/avutil.h
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@ -40,7 +40,7 @@
#define AV_VERSION(a, b, c) AV_VERSION_DOT(a, b, c)
#define LIBAVUTIL_VERSION_MAJOR 50
#define LIBAVUTIL_VERSION_MINOR 26
#define LIBAVUTIL_VERSION_MINOR 27
#define LIBAVUTIL_VERSION_MICRO 0
#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \

17
libavutil/common.h
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@ -192,6 +192,20 @@ static inline av_const int av_ceil_log2_c(int x)
return av_log2((x - 1) << 1);
}
/**
* Count number of bits set to one in x
* @param x value to count bits of
* @return the number of bits set to one in x
*/
static inline av_const int av_popcount_c(uint32_t x)
{
x -= (x >> 1) & 0x55555555;
x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
x = (x + (x >> 4)) & 0x0F0F0F0F;
x += x >> 8;
return (x + (x >> 16)) & 0x3F;
}
#define MKTAG(a,b,c,d) ((a) | ((b) << 8) | ((c) << 16) | ((d) << 24))
#define MKBETAG(a,b,c,d) ((d) | ((c) << 8) | ((b) << 16) | ((a) << 24))
@ -351,3 +365,6 @@ static inline av_const int av_ceil_log2_c(int x)
#ifndef av_clipf
# define av_clipf av_clipf_c
#endif
#ifndef av_popcount
# define av_popcount av_popcount_c
#endif