demultiplexer.html

JMF原版英文说明文档

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<TD><CODE><A HREF="../../javax/media/MediaHandler.html#setSource(javax.media.protocol.DataSource)">setSource</A></CODE></TD>
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<TD><B>Methods inherited from interface javax.media.<A HREF="../../javax/media/Controls.html">Controls</A></B></TD>
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<TD><CODE><A HREF="../../javax/media/Controls.html#getControl(java.lang.String)">getControl</A>, 
<A HREF="../../javax/media/Controls.html#getControls()">getControls</A></CODE></TD>
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<B>Method Detail</B></FONT></TD>
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<A NAME="getSupportedInputContentDescriptors()"><!-- --></A><H3>
getSupportedInputContentDescriptors</H3>
<PRE>
public <A HREF="../../javax/media/protocol/ContentDescriptor.html">ContentDescriptor</A>[] <B>getSupportedInputContentDescriptors</B>()</PRE>
<DL>
<DD>Lists the all of the input content descriptors that this <CODE>Demultiplexer</CODE> supports.<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="start()"><!-- --></A><H3>
start</H3>
<PRE>
public void <B>start</B>()
           throws java.io.IOException</PRE>
<DL>
<DD>Signals that data is going to start being read from the <CODE>Demultiplexer</CODE>. 
 The <CODE>start</CODE> method is called before any calls are made to <code>readFrame</code>.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Throws:</B><DD>java.io.IOException - If there is an error when trying to read from the <code>DataSource</code>.</DL>
</DD>
</DL>
<HR>

<A NAME="stop()"><!-- --></A><H3>
stop</H3>
<PRE>
public void <B>stop</B>()</PRE>
<DL>
<DD>Signals that data is going to stop being read from the <CODE>Demultiplexer</CODE>.
 After the <CODE>stop</CODE> method is called, <code>readFrame</code> will not be called again unless  
 <code>start</code> is called first.<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getTracks()"><!-- --></A><H3>
getTracks</H3>
<PRE>
public <A HREF="../../javax/media/Track.html">Track</A>[] <B>getTracks</B>()
                  throws java.io.IOException,
                         <A HREF="../../javax/media/BadHeaderException.html">BadHeaderException</A></PRE>
<DL>
<DD><p>
 Retrieves the individual tracks that the media stream contains.
 A stream can contain multiple media tracks, such as separate tracks for
 audio, video, and midi data. The information specific to a track
 is abstracted by an instance of a class that implements the <code>Track</code> interface.
 The <code>Track</code> interface also provides methods for enabling or disabling
 a track.
 <p>
 When <CODE>getTracks</CODE> is called, the stream header is read and
 parsed (if there is one), the track information is retrieved,
 the maximum frame size for each track is computed, and 
 the play list is built (if applicable).<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>An array of <code>Track</code> objects. The length of the array
 is equal to the number of tracks in the stream.<DT><B>Throws:</B><DD><A HREF="../../javax/media/BadHeaderException.html">BadHeaderException</A> - If the header information
 is incomplete or inconsistent.<DD>java.io.IOException - If there is an error when trying to read from the <code>DataSource</code>.</DL>
</DD>
</DL>
<HR>

<A NAME="isPositionable()"><!-- --></A><H3>
isPositionable</H3>
<PRE>
public boolean <B>isPositionable</B>()</PRE>
<DL>
<DD>Checks whether or not the stream can be repositioned
 to the beginning.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD><CODE>true</CODE> if the stream can be repositioned, <CODE>false</CODE> if it cannot.</DL>
</DD>
</DL>
<HR>

<A NAME="isRandomAccess()"><!-- --></A><H3>
isRandomAccess</H3>
<PRE>
public boolean <B>isRandomAccess</B>()</PRE>
<DL>
<DD>Checks whether or not the stream can be positioned at any <CODE>Time</CODE>.
 If <CODE>isRandomAccess</CODE> returns <CODE>true</CODE>, then the stream is also positionable (<CODE>isPositionable</CODE> returns <CODE>true</CODE>).
 However, a stream can be positionable but not random access--the <CODE>isPositionable</CODE> method might return <CODE>true</CODE> even
 if <CODE>isRandomAccess</CODE> returns <CODE>false</CODE>.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD><CODE>true</CODE> if the stream is a random access stream, <CODE>false</CODE> if it is not.</DL>
</DD>
</DL>
<HR>

<A NAME="setPosition(javax.media.Time, int)"><!-- --></A><H3>
setPosition</H3>
<PRE>
public <A HREF="../../javax/media/Time.html">Time</A> <B>setPosition</B>(<A HREF="../../javax/media/Time.html">Time</A>&nbsp;where,
                        int&nbsp;rounding)</PRE>
<DL>
<DD>Sets the stream position (media time) to the specified <CODE>Time</CODE>.
 Returns the rounded position that was actually set.
 Implementations should set the position to a key frame, if possible.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>time</CODE> - The new stream position, specified as a <CODE>Time</CODE>.<DD><CODE>round</CODE> - The rounding technique to be used: <CODE>RoundUp</CODE>, <CODE>RoundDown</CODE>, or <CODE>RoundNearest</CODE>.<DT><B>Returns:</B><DD>The actual stream position that was set as a <CODE>Time</CODE> object.</DL>
</DD>
</DL>
<HR>

<A NAME="getMediaTime()"><!-- --></A><H3>
getMediaTime</H3>
<PRE>
public <A HREF="../../javax/media/Time.html">Time</A> <B>getMediaTime</B>()</PRE>
<DL>
<DD>Gets the current media time. This is the stream position that the next <CODE>readFrame</CODE> will read.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>The current position in the media stream as a <CODE>Time</CODE> object.</DL>
</DD>
</DL>
<HR>

<A NAME="getDuration()"><!-- --></A><H3>
getDuration</H3>
<PRE>
public <A HREF="../../javax/media/Time.html">Time</A> <B>getDuration</B>()</PRE>
<DL>
<DD>Gets the duration of this media stream
 when played at the default rate.
 <p>
 Note that each track can have a different duration and a
 different start time. This method returns
 the total duration from when the first track starts and the last track ends.<DD><DL>
<DT><B>Specified by: </B><DD><A HREF="../../javax/media/Duration.html#getDuration()">getDuration</A> in interface <A HREF="../../javax/media/Duration.html">Duration</A></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>A <CODE>Time</CODE> object that represents the duration
 or <CODE>DURATION_UNKNOWN</CODE> if the duration cannot be determined.</DL>
</DD>
</DL>
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