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/*
* Jitsi, the OpenSource Java VoIP and Instant Messaging client.
*
* Distributable under LGPL license.
* See terms of license at gnu.org.
*/
package net.java.sip.communicator.impl.neomedia.protocol;
import java.io.*;
import javax.media.*;
import javax.media.protocol.*;
/**
* Implements a <tt>PullBufferDataSource</tt> wrapper which provides mute
* support for the wrapped instance.
* <p>
* Because the class wouldn't work for our use case without it,
* <tt>CaptureDevice</tt> is implemented and is being delegated to the wrapped
* <tt>DataSource</tt> (if it supports the interface in question).
* </p>
*
* @author Damian Minkov
* @author Lubomir Marinov
*/
public class MutePullBufferDataSource
extends PullBufferDataSourceDelegate<PullBufferDataSource>
implements MuteDataSource
{
/**
* The indicator which determines whether this <tt>DataSource</tt> is mute.
*/
private boolean mute;
/**
* Initializes a new <tt>MutePullBufferDataSource</tt> instance which is to
* provide mute support for a specific <tt>PullBufferDataSource</tt>.
*
* @param dataSource the <tt>PullBufferDataSource</tt> the new instance is
* to provide mute support for
*/
public MutePullBufferDataSource(PullBufferDataSource dataSource)
{
super(dataSource);
}
/**
* Sets the mute state of this <tt>DataSource</tt>.
*
* @param mute <tt>true</tt> to mute this <tt>DataSource</tt>; otherwise,
* <tt>false</tt>
*/
public void setMute(boolean mute)
{
this.mute = mute;
}
/**
* Determines whether this <tt>DataSource</tt> is mute.
*
* @return <tt>true</tt> if this <tt>DataSource</tt> is mute; otherwise,
* <tt>false</tt>
*/
public boolean isMute()
{
return mute;
}
/**
* Get wrapped DataSource.
*
* @return wrapped DataSource
*/
public PullBufferDataSource getWrappedDataSource()
{
return dataSource;
}
/**
* Implements {@link PullBufferDataSource#getStreams()}. Wraps the streams
* of the wrapped <tt>PullBufferDataSource</tt> into
* <tt>MutePullBufferStream</tt> instances in order to provide mute support
* to them.
*
* @return an array of <tt>PullBufferStream</tt> instances with enabled mute
* support
*/
public PullBufferStream[] getStreams()
{
PullBufferStream[] streams = dataSource.getStreams();
if (streams != null)
for (int streamIndex = 0; streamIndex < streams.length; streamIndex++)
streams[streamIndex] =
new MutePullBufferStream(streams[streamIndex]);
return streams;
}
/**
* Implements a <tt>PullBufferStream</tt> wrapper which provides mute
* support for the wrapped instance.
*/
private class MutePullBufferStream
extends SourceStreamDelegate<PullBufferStream>
implements PullBufferStream
{
/**
* Initializes a new <tt>MutePullBufferStream</tt> instance which is to
* provide mute support for a specific <tt>PullBufferStream</tt>.
*
* @param stream the <tt>PullBufferStream</tt> the new instance is to
* provide mute support for
*/
private MutePullBufferStream(PullBufferStream stream)
{
super(stream);
}
/**
* Implements {@link PullBufferStream#getFormat()}. Delegates to the
* wrapped <tt>PullBufferStream</tt>.
*
* @return the <tt>Format</tt> of the wrapped <tt>PullBufferStream</tt>
*/
public Format getFormat()
{
return stream.getFormat();
}
/**
* Implements PullBufferStream#read(Buffer). If this instance is muted
* (through its owning MutePullBufferDataSource), overwrites the data
* read from the wrapped PullBufferStream with silence data.
* @param buffer which data will be filled.
* @throws IOException Thrown if an error occurs while reading.
*/
public void read(Buffer buffer)
throws IOException
{
stream.read(buffer);
if (isMute())
MutePushBufferDataSource.mute(buffer);
}
/**
* Implements PullBufferStream#willReadBlock(). Delegates to the wrapped
* PullSourceStream.
* @return <tt>true</tt> if read would block; otherwise returns
* <tt>false</tt>.
*/
public boolean willReadBlock()
{
return stream.willReadBlock();
}
}
}
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