In all criminal prosecutions the accused shall enjoy the right to a speedy and public trial by impartial jury of the county in which the crime shall have been committed; provided that the venue may be changed to any other county of the judicial district in which the indictment is found, upon the application of the accused, in such manner as now is, or may be, prescribed by law; and to be informed of the nature and cause of the accusation against him, and to have a copy thereof; and to be confronted with the witnesses against him; to have compulsory process for obtaining witness in his favor, and to be heard by himself and his counsel.