SUM_LEN           233 libavfilter/vf_ssim.c     int64_t (*sum1)[4] = sum0 + SUM_LEN(width);
SUM_LEN           261 libavfilter/vf_ssim.c     int (*sum1)[4] = sum0 + SUM_LEN(width);
SUM_LEN           413 libavfilter/vf_ssim.c     s->temp = av_mallocz_array(2 * SUM_LEN(inlink->w), (desc->comp[0].depth > 8) ? sizeof(int64_t[4]) : sizeof(int[4]));