MASK_Y_TOP_ROW    505 libavcodec/rv40.c                     | ((cbp[POS_CUR]                           <<  4) & ~MASK_Y_TOP_ROW)
MASK_Y_TOP_ROW    519 libavcodec/rv40.c             y_h_deblock &= ~MASK_Y_TOP_ROW;
MASK_Y_TOP_ROW    521 libavcodec/rv40.c             y_h_deblock &= ~(MASK_Y_TOP_ROW << 16);