getSubSampleFactors 2288 libswscale/swscale.c     getSubSampleFactors(&c->chrSrcHSubSample, &c->chrSrcVSubSample, srcFormat);
getSubSampleFactors 2289 libswscale/swscale.c     getSubSampleFactors(&c->chrDstHSubSample, &c->chrDstVSubSample, dstFormat);