MB_TYPE_REF0      100 libavcodec/h264data.c     { MB_TYPE_8x8   | MB_TYPE_P0L0 | MB_TYPE_P1L0 | MB_TYPE_REF0, 4 },
MB_TYPE_REF0      103 libavcodec/h264dec.h #define IS_REF0(a)         ((a) & MB_TYPE_REF0)