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lavu: add av_gcd_q().

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This commit is contained in:
Nicolas George 2020-04-16 21:36:00 +02:00
parent beb98c0181
commit 6b65c4ec54
4 changed files with 20 additions and 2 deletions
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3
doc/APIchanges
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@ -15,6 +15,9 @@ libavutil: 2017-10-21
API changes, most recent first:
2020-05-23 - xxxxxxxxxx - lavu 56.47.100 - rational.h
Add av_gcd_q().
2020-05-22 - xxxxxxxxxx - lavu 56.46.101 - opt.h
Add AV_OPT_FLAG_CHILD_CONSTS.

9
libavutil/rational.c
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@ -182,3 +182,12 @@ uint32_t av_q2intfloat(AVRational q) {
return sign<<31 | (150-shift)<<23 | (n - (1<<23));
}
AVRational av_gcd_q(AVRational a, AVRational b, int max_den, AVRational def)
{
int64_t gcd, lcm;
gcd = av_gcd(a.den, b.den);
lcm = (a.den / gcd) * b.den;
return lcm < max_den ? av_make_q(av_gcd(a.num, b.num), lcm) : def;
}

6
libavutil/rational.h
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@ -207,6 +207,12 @@ int av_find_nearest_q_idx(AVRational q, const AVRational* q_list);
*/
uint32_t av_q2intfloat(AVRational q);
/**
* Return the best rational so that a and b are multiple of it.
* If the resulting denominator is larger than max_den, return def.
*/
AVRational av_gcd_q(AVRational a, AVRational b, int max_den, AVRational def);
/**
* @}
*/

4
libavutil/version.h
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@ -79,8 +79,8 @@
*/
#define LIBAVUTIL_VERSION_MAJOR 56
#define LIBAVUTIL_VERSION_MINOR 46
#define LIBAVUTIL_VERSION_MICRO 101
#define LIBAVUTIL_VERSION_MINOR 47
#define LIBAVUTIL_VERSION_MICRO 100
#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
LIBAVUTIL_VERSION_MINOR, \