SpyDroid源码分析系列5：Session之方法分析

下面开始分析函数.

~~~~~~~~~~~~~~~~~~~~~~~~~~

public Session() 
{
this(null, null);
try 
{
mOrigin = InetAddress.getLocalHost();
} 
catch (Exception ignore) 
{
mOrigin = null;
}
}
/** 
* Creates a streaming session that can be customized by adding tracks.
* @param destination The destination address of the streams
* @param origin The origin address of the streams (appears in the session description)
*/
public Session(InetAddress origin, InetAddress destination) 
{
long uptime = System.currentTimeMillis();
mDestination = destination;
mOrigin = origin;
mTimestamp = (uptime/1000)<<32 
& 
(
(
(
uptime-( 
(uptime/1000)*1000
 )
)>>32
)/1000
); // NTP timestamp
}
//两个初始化函数，设计到的变量有mOrigin,mDestination,mTimestamp.
//System.currentTimeMillis()产生一个当前的毫秒,这个毫秒其实就是自1970年1月1日0时起的毫秒数
~~~~~~~~~~~~~~~~~~~~~~~~

public void addAudioTrack(AudioStream track) 
{
mAudioStream = track;
}
public void removeAudioTrack() 
{
mAudioStream = null;
}
public AudioStream getAudioTrack() 
{
return mAudioStream;
}
//对mAudioStream的setter和getter方法

~~~~~~~~~~~

public void addVideoTrack(VideoStream track) 
{
mVideoStream = track;
}
public void removeVideoTrack() 
{
mVideoStream = null;
}
public VideoStream getVideoTrack() 
{
return mVideoStream;
}
//对mVideoStream的setter和getter方法

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

public boolean trackExists(int id) 
{
if (id==0) 
return mAudioStream!=null;
else
return mVideoStream!=null;
}
//判断频道是否存在
//0表示音频 1表示视频
~~~~~~~~~~~~~~~~~~~~~~~~~~

public Stream getTrack(int id) 
{
if (id==0)
return mAudioStream;
else
return mVideoStream;
}
//对视频流和音频流的返回

~~~~~~~~~~~~~~~~~~~~~~~~~~~~

public void setContext(Context context) 
{
mContext = context;
}
//设置mContext对象

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

public void setOrigin(InetAddress origin) 
{
mOrigin = origin;
}
//设置mOrigin对象

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

public void setDestination(InetAddress destination) throws IllegalStateException 
{
mDestination =  destination;
}
public InetAddress getDestination() 
{
return mDestination;
}
//设置mDestination
//对mDestination的getter和setter方法

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

public void setTimeToLive(int ttl) 
{
mTimeToLive = ttl;
}
//设置TTL

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

public boolean isStreaming() 
{
if ( (mAudioStream!=null && mAudioStream.isStreaming()) || (mVideoStream!=null && mVideoStream.isStreaming()) )
return true;
else 
return false;
}
//判断是否正在传输阶段

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

public long getBitrate() 
{
long sum = 0;
if (mAudioStream != null) sum += mAudioStream.getBitrate();
if (mVideoStream != null) sum += mVideoStream.getBitrate();
return sum;
}
//获取传输速率
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

剩下的6个函数需要对后面的几个类了解之后才能顺利进行！