av_log2_i          64 libavutil/integer.c     int na= (av_log2_i(a)+16) >> 4;
av_log2_i          65 libavutil/integer.c     int nb= (av_log2_i(b)+16) >> 4;
av_log2_i         109 libavutil/integer.c     int i= av_log2_i(a) - av_log2_i(b);
av_log2_i         191 libavutil/integer.c             assert(av_log2_i(ai) == av_log2(a));