使用播放器的媒体状态.
0 什么都没有，
1 次开放，
2 缓冲，
3 玩，
4 暂停，
5 停了，
6 结束，
7 错误

Use the media state from the player.
0 nothing,
1 opening,
2 buffering,
3 playing,
4 paused,
5 stopped,
6 ended,
7 error

    if not self.player.get_media():
        print "fail"
        return
    else:
        media_state = self.player.get_state()
        while media_state != 3 and media_state != 4:
            media_state = self.player.get_state()
            print repr(media_state)
    print repr(media_state)