📄 pullbufferstream.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Sat May 20 18:57:53 PDT 2000 --><TITLE>: Interface PullBufferStream</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../overview-summary.html"><FONT ID="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT ID="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT ID="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../deprecated-list.html"><FONT ID="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../index-all.html"><FONT ID="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../help-doc.html"><FONT ID="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../javax/media/protocol/Positionable.html"><B>PREV CLASS</B></A> <A HREF="../../../javax/media/protocol/PullSourceStream.html"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="PullBufferStream.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">javax.media.protocol</FONT><BR>Interface PullBufferStream</H2><HR><DL><DT>public interface <B>PullBufferStream</B><DT>extends <A HREF="../../../javax/media/protocol/SourceStream.html">SourceStream</A></DL><P>Abstracts a read interface that data is pulled from in the form of Buffer objects This interface allows a sourcestream to transfer data in the form of an entire media chunk to the user of this sourcestream. The media object or chunk transferred is the Buffer object as defined in javax.media.Buffer. The user of the stream will allocate an empty Buffer object and pass this over to the sourcestream in the read() method. The source of the stream will allocate the Buffer object's data and header, set them on the Buffer and send them over to the user. The structure of the data and header of the Buffer object is determined by the format attribute of the Buffer object or the content type of the sourcestream<BR><BR> It is possible for the user of the stream to indicate to the sourcestream to NOT allocate the data object, but to instead use the data passed in the read() method. In this case, the user must pass non null data object to the stream in the Buffer object. The type of data can be determined by the getDataType() method on the format object returned by calling <code>getFormat</code> on this bufferstream. The <code>getDataType</code> method will return a Class describing the Buffer's data and can be used by the stream user to allocate its own data and hand it over to the read method.<P><DL><DT><B>Since: </B><DD>JMF 2.0</DD><DT><B>See Also: </B><DD><A HREF="../../../javax/media/Format.html"><CODE>Format</CODE></A>, <A HREF="../../../javax/media/Buffer.html"><CODE>Buffer</CODE></A>, <A HREF="../../../javax/media/protocol/PullBufferDataSource.html"><CODE>PullBufferDataSource</CODE></A></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><A NAME="fields_inherited_from_class_javax.media.protocol.SourceStream"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from interface javax.media.protocol.<A HREF="../../../javax/media/protocol/SourceStream.html">SourceStream</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../javax/media/protocol/SourceStream.html#LENGTH_UNKNOWN">LENGTH_UNKNOWN</A></CODE></TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../javax/media/Format.html">Format</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/protocol/PullBufferStream.html#getFormat()">getFormat</A></B>()</CODE><BR> Get the format type of the data that this source stream provides.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/protocol/PullBufferStream.html#read(javax.media.Buffer)">read</A></B>(<A HREF="../../../javax/media/Buffer.html">Buffer</A> buffer)</CODE><BR> Block and read a buffer from the stream.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/protocol/PullBufferStream.html#willReadBlock()">willReadBlock</A></B>()</CODE><BR> Find out if data is available now.</TD></TR></TABLE> <A NAME="methods_inherited_from_class_javax.media.protocol.SourceStream"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from interface javax.media.protocol.<A HREF="../../../javax/media/protocol/SourceStream.html">SourceStream</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../javax/media/protocol/SourceStream.html#endOfStream()">endOfStream</A>, <A HREF="../../../javax/media/protocol/SourceStream.html#getContentDescriptor()">getContentDescriptor</A>, <A HREF="../../../javax/media/protocol/SourceStream.html#getContentLength()">getContentLength</A></CODE></TD></TR></TABLE> <A NAME="methods_inherited_from_class_javax.media.Controls"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from interface javax.media.<A HREF="../../../javax/media/Controls.html">Controls</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><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></TR></TABLE> <P><!-- ============ FIELD DETAIL =========== --><!-- ========= CONSTRUCTOR DETAIL ======== --><!-- ============ METHOD DETAIL ========== --><A NAME="method_detail"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Method Detail</B></FONT></TD></TR></TABLE><A NAME="willReadBlock()"><!-- --></A><H3>willReadBlock</H3><PRE>public boolean <B>willReadBlock</B>()</PRE><DL><DD>Find out if data is available now. Returns <CODE>true</CODE> if a call to <CODE>read</CODE> would block for data.<DD><DL></DL></DD><DD><DL><DT><B>Returns:</B><DD><CODE>true</CODE> if read would block; otherwise returns <CODE>false</CODE>.</DL></DD></DL><HR><A NAME="read(javax.media.Buffer)"><!-- --></A><H3>read</H3><PRE>public void <B>read</B>(<A HREF="../../../javax/media/Buffer.html">Buffer</A> buffer) throws java.io.IOException</PRE><DL><DD>Block and read a buffer from the stream. <code>buffer</code> should be non-null. <p><DD><DL></DL></DD><DD><DL><DT><B>Throws:</B><DD>java.io.IOException - Thrown if an error occurs while reading.</DL></DD></DL><HR><A NAME="getFormat()"><!-- --></A><H3>getFormat</H3><PRE>public <A HREF="../../../javax/media/Format.html">Format</A> <B>getFormat</B>()</PRE><DL><DD>Get the format type of the data that this source stream provides.<DD><DL></DL></DD><DD><DL><DT><B>Returns:</B><DD>A <CODE>Format</CODE> object that describes the data in this stream.</DL></DD></DL><!-- ========= END OF CLASS DATA ========= --><HR><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_bottom"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_bottom_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../overview-summary.html"><FONT ID="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT ID="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT ID="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../deprecated-list.html"><FONT ID="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../index-all.html"><FONT ID="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../help-doc.html"><FONT ID="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../javax/media/protocol/Positionable.html"><B>PREV CLASS</B></A> <A HREF="../../../javax/media/protocol/PullSourceStream.html"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="PullBufferStream.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><font size="-1"> <a href="mailto:jmf-bugs@sun.com">Submit a bug or feature</a> <br>Copyright 1999-2000 Sun Microsystems, Inc. 901 San Antonio Road, Palo Alto, California, 94303, U.S.A. All Rights Reserved. See the <a href="spec-license.html">Specification License</a> for more details. <br>Sun, Sun Microsystems, and Java are trademarks or registered trademarks of Sun Microsystems, Inc. in the US and other countries.</font></BODY></HTML>
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