/*
* Copyright (C) 2005 Luca Veltri - University of Parma - Italy
*
* This source code is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This source code is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this source code; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author(s):
* Luca Veltri (luca.veltri@unipr.it)
*/
package local.media;
import javax.sound.sampled.*;
import java.io.*;
/** AudioOutputStream is equivalent to javax.sound.sampled.AudioInputStream
* for audio playout.
* <p/>
* AudioOutputStream also provides audio codec conversion, as
* javax.sound.sampled.AudioSystem does for the corresponding
* javax.sound.sampled.AudioInputStream class.
*/
class AudioOutputStream extends OutputStream
{
static final int INTERNAL_BUFFER_SIZE=40960;
/** The SourceDataLine */
protected SourceDataLine source_line;
/** Converted InputStream. */
protected InputStream input_stream;
/** Piped OutputStream. */
protected OutputStream output_stream;
/** Internal buffer. */
private byte[] buff=new byte[INTERNAL_BUFFER_SIZE];
/** Creates a new AudioOutputStream from a SourceDataLine. */
public AudioOutputStream(SourceDataLine source_line)
{ this.source_line=source_line;
input_stream=null;
output_stream=null;
}
/** Creates a new AudioOutputStream from a SourceDataLine converting the audio format. */
public AudioOutputStream(SourceDataLine source_line, AudioFormat format) throws IOException
{ this.source_line=source_line;
PipedInputStream piped_input_stream=new PipedInputStream();
output_stream=new PipedOutputStream(piped_input_stream);
AudioInputStream audio_input_stream=new AudioInputStream(piped_input_stream,format,-1);
if (audio_input_stream==null)
{ String err="Failed while creating a new AudioInputStream.";
throw new IOException(err);
}
input_stream=AudioSystem.getAudioInputStream(source_line.getFormat(),audio_input_stream);
if (input_stream==null)
{ String err="Failed while getting a transcoded AudioInputStream from AudioSystem.";
err+="\n input codec: "+format.toString();
err+="\n output codec:"+source_line.getFormat().toString();
throw new IOException(err);
}
}
/** Closes this output stream and releases any system resources associated with this stream. */
public void close()
{ //source_line.close();
}
/** Flushes this output stream and forces any buffered output bytes to be written out. */
public void flush()
{ source_line.flush();
}
/** Writes b.length bytes from the specified byte array to this output stream. */
public void write(byte[] b) throws IOException
{ if (output_stream!=null)
{ output_stream.write(b);
int len=input_stream.read(buff,0,buff.length);
source_line.write(buff,0,len);
}
else
{ source_line.write(b,0,b.length);
}
}
/** Writes len bytes from the specified byte array starting at offset off to this output stream. */
public void write(byte[] b, int off, int len) throws IOException
{ if (output_stream!=null)
{ output_stream.write(b,off,len);
len=input_stream.read(buff,0,buff.length);
source_line.write(buff,0,len);
}
else
{ source_line.write(b,off,len);
}
}
/** Writes the specified byte to this output stream. */
public void write(int b) throws IOException
{ if (output_stream!=null)
{ output_stream.write(b);
int len=input_stream.read(buff,0,buff.length);
source_line.write(buff,0,len);
}
else
{ buff[0]=(byte)b;
source_line.write(buff,0,1);
}
}
}