这个设置为0是什么意思,我看到常量值没有0
public static final int BVCU_MEDIADIR_VIDEOSEND = 1;
public static final int BVCU_MEDIADIR_VIDEORECV = 2;
public static final int BVCU_MEDIADIR_AUDIOSEND = 4;
public static final int BVCU_MEDIADIR_AUDIORECV = 8;
public static final int BVCU_MEDIADIR_TALKONLY = 12;
public static final int BVCU_MEDIADIR_DATASEND = 16;
public static final int BVCU_MEDIADIR_DATARECV = 32;
public static final int BVCU_MEDIADIR_CALL_AUDIO = 64;