http://wenku.baidu.com/link?url=5oV7j5aOBKjhbUPDo2siO-qcdY747-ewNluCOQqS4QqBP-sngluGTgA4Ap4heRCdyp56NR2D15jLqQqUKhwMhVppgj_qipO7TgcABJpZo4G
我会用opencv做,不然得用其他的解码器。