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jeremybenn |
/* GstInputStream.java -- Trampoline class for an InputStream, mean to be used
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by native code.
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Copyright (C) 2007 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.javax.sound.sampled.gstreamer.io;
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import gnu.classpath.Pointer;
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import java.io.IOException;
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import java.io.InputStream;
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/**
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* Encapsulates the functionality of an InputStream Object.
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*
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* This class is only meant to be used by the native code, to allow reading
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* of the given InputStream as part of a the GStreamer InputStream Source
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* Plugin.
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*
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* <strong>Note:</strong> this class will be not garbage collected as the
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* native code contains strong references to internal fields.
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* The native layer provides a method that can be called by the C code to
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* free the resources and to let the garbage collected to handle this class
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* when not needed anymore.
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*
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* @author Mario Torre <neugens@limasoftware.net>
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*/
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public class GstInputStream
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{
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/** The real InputStream on which to perform reading operations. */
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private InputStream istream;
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/**
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* Initialized in the native code, don't change without changes
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* in the native layer.
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*/
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private Pointer gstInputStream = null;
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public GstInputStream(InputStream istream)
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{
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this.istream = istream;
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init_instance();
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}
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public int read(byte[] buf, int off, int len) throws IOException
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{
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return this.istream.read(buf, off, len);
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}
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public int available() throws IOException
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{
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return this.istream.available();
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}
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/**
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* Return a reference to the GstInputStream native class as a Pointer object.
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* This method is intended as an helper accessor and the returned pointer
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* needs to be casted and used in the native code only.
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*
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* @return Pointer to the native GstInputStream class.
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*/
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public Pointer getNativeClass()
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{
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return this.gstInputStream;
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}
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/* native methods */
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/**
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* Initialize the native peer and enables the object cache.
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* It is meant to be used by the class constructor.
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*/
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native private final void init_instance();
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/**
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* Initialize the native peer and enables the object cache.
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* It is meant to be used by the static initializer.
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*/
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native private static final void init_id_cache();
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static
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{
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System.loadLibrary("gstreamerpeer"); //$NON-NLS-1$
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init_id_cache();
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}
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}
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