确保stop或pause后不再派发prebuffer事件
确保stop或pause后不再派发prebuffer事件

fengyapeng/muplayer,Denniskevin/muplayer,sdgdsffdsfff/muplayer,wangjun/muplayer,cnbin/muplayer,Baidu-Music-FE/muplayer,cnbin/muplayer,Baidu-Music-FE/muplayer,wangjun/muplayer,Denniskevin/muplayer,fengyapeng/muplayer,sdgdsffdsfff/muplayer