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av_compare_ts() 

Originally committed as revision 21671 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2010-02-07 16:26:50 +00:00
parent 9e5381a21b
commit 78b0182375
2 changed files with 17 additions and 0 deletions
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8
libavutil/mathematics.c
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@ -136,6 +136,14 @@ int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq){
return av_rescale_rnd(a, b, c, AV_ROUND_NEAR_INF);
}
int av_compare_ts(int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b){
int64_t a= tb_a.num * (int64_t)tb_b.den;
int64_t b= tb_b.num * (int64_t)tb_a.den;
if (av_rescale_rnd(ts_a, a, b, AV_ROUND_DOWN) < ts_b) return -1;
if (av_rescale_rnd(ts_b, b, a, AV_ROUND_DOWN) < ts_a) return 1;
return 0;
}
#ifdef TEST
#include "integer.h"
#undef printf

9
libavutil/mathematics.h
View File

@ -80,4 +80,13 @@ int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding) av_cons
*/
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq) av_const;
/**
* Compares 2 timestamps each in its own timebases.
* The result of the function is undefined if one of the timestamps
* is outside the int64_t range when represented in the others timebase.
* @returns -1 if ts_a is before ts_b, 1 if ts_a is after ts_b or 0 if they represent the same position
*/
int av_compare_ts(int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b);
#endif /* AVUTIL_MATHEMATICS_H */