package javazoom.jlGui;

/**
 * BasicPlayer.
 *
 *-----------------------------------------------------------------------
 *  This program 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 program 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 program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *----------------------------------------------------------------------
 */
import java.io.*;
import java.util.*;
import	java.net.URL;

import	javax.sound.sampled.AudioFormat;
import  javax.sound.sampled.AudioFileFormat;
import	javax.sound.sampled.AudioInputStream;
import	javax.sound.sampled.AudioSystem;
import	javax.sound.sampled.DataLine;
import	javax.sound.sampled.LineUnavailableException;
import	javax.sound.sampled.SourceDataLine;
import	javax.sound.sampled.UnsupportedAudioFileException;
import	javax.sound.sampled.FloatControl;
import	javax.sound.sampled.Control;
import 	javazoom.Util.Debug;

/**
 * BasicPlayer implements basics features of a player. The playback is done
 * with a thread.
 * BasicPlayer is the result of jlGui 0.5 from JavaZOOM and BaseAudioStream
 * from Matthias Pfisterer JavaSound examples.
 *
 * @author	E.B from JavaZOOM
 *
 * Homepage : http://www.javazoom.net
 *
 */
public class BasicPlayer implements Runnable
{

	private static final int		EXTERNAL_BUFFER_SIZE = 4000 * 4;

	private Thread					m_thread = null;
	private Object					m_dataSource;
	private AudioInputStream		m_audioInputStream;
	private AudioFileFormat			m_audioFileFormat;
	private SourceDataLine			m_line;
	private FloatControl			m_gainControl;
	private FloatControl			m_panControl;

	/**
	 * These variables are used to distinguish stopped, paused, playing states.
	 * We need them to control Thread.
	 */
	private static final int		PLAYING=0;
	private static final int		PAUSED=1;
	private static final int		STOPPED=2;
	private static final int		READY=3;
	private int						m_status = READY;
	private	long					doSeek = -1;
	private File					_file = null;
	private BasicPlayerListener		m_bpl = null;

	/**
	 * Constructs a Basic Player.
	 */
	public BasicPlayer()
	{
		m_dataSource = null;
		m_audioInputStream = null;
		m_audioFileFormat = null;
		m_line = null;
		m_gainControl = null;
		m_panControl = null;
	}

	/**
	 * Constructs a Basic Player with a BasicPlayerListener.
	 */
	public BasicPlayer(BasicPlayerListener bpl)
	{
		this();
		m_bpl = bpl;
	}

	/**
	 * Sets the data source as a file.
	 */
	protected void setDataSource(File file) throws UnsupportedAudioFileException, LineUnavailableException, IOException
	{
		if (file != null)
		{
			m_dataSource = file;
			initAudioInputStream();
		}
	}


	/**
	 * Sets the data source as an url.
	 */
	protected void setDataSource(URL url) throws UnsupportedAudioFileException, LineUnavailableException, IOException
	{
		if (url != null)
		{
			m_dataSource = url;
			initAudioInputStream();
		}
	}


	/**
	 * Inits Audio ressources from the data source.<br>
	 * - AudioInputStream <br>
	 * - AudioFileFormat
	 */
	private void initAudioInputStream() throws UnsupportedAudioFileException, LineUnavailableException, IOException
	{
		if (m_dataSource instanceof URL)
		{
			initAudioInputStream((URL) m_dataSource);
		}
		else if (m_dataSource instanceof File)
		{
			initAudioInputStream((File) m_dataSource);
		}
	}

	/**
	 * Inits Audio ressources from file.
	 */
	private void initAudioInputStream(File file) throws	UnsupportedAudioFileException, IOException
	{
		_file = file;
		m_audioInputStream = AudioSystem.getAudioInputStream(file);
		m_audioFileFormat = AudioSystem.getAudioFileFormat(file);
	}

	/**
	 * Inits Audio ressources from URL.
	 */
	private void initAudioInputStream(URL url) throws UnsupportedAudioFileException, IOException
	{
		m_audioInputStream = AudioSystem.getAudioInputStream(url);
		m_audioFileFormat = AudioSystem.getAudioFileFormat(url);
	}

	/**
	 * Inits Audio ressources from AudioSystem.<br>
	 * DateSource must be present.
	 */
	protected void initLine() throws LineUnavailableException
	{
		if (m_line == null)
		{
			createLine();
			trace(1,getClass().getName(), "Create Line OK ");
			openLine();
		}
		else
		{
			AudioFormat	lineAudioFormat = m_line.getFormat();
			AudioFormat	audioInputStreamFormat = m_audioInputStream == null ? null : m_audioInputStream.getFormat();
			if (!lineAudioFormat.equals(audioInputStreamFormat))
			{
				m_line.close();
				openLine();
			}
		}
	}

	/**
	 * Inits a DateLine.<br>
	 *
	 * We check if the line supports Volume and Pan controls.
	 *
	 * From the AudioInputStream, i.e. from the sound file, we
	 * fetch information about the format of the audio data. These
	 * information include the sampling frequency, the number of
	 * channels and the size of the samples. There information
	 * are needed to ask JavaSound for a suitable output line
	 * for this audio file.
	 * Furthermore, we have to give JavaSound a hint about how
	 * big the internal buffer for the line should be. Here,
	 * we say AudioSystem.NOT_SPECIFIED, signaling that we don't
	 * care about the exact size. JavaSound will use some default
	 * value for the buffer size.
	 */
	private void createLine() throws LineUnavailableException
	{
		if (m_line == null)
		{
			AudioFormat	sourceFormat = m_audioInputStream.getFormat();
			trace(1,getClass().getName(), "Source format : ", sourceFormat.toString());
			AudioFormat	targetFormat = new AudioFormat( AudioFormat.Encoding.PCM_SIGNED,
														sourceFormat.getSampleRate(),
														16,
														sourceFormat.getChannels(),
														sourceFormat.getChannels() * 2,
														sourceFormat.getSampleRate(),
														false);

			trace(1,getClass().getName(), "Target format: " + targetFormat);
			m_audioInputStream = AudioSystem.getAudioInputStream(targetFormat, m_audioInputStream);
			AudioFormat audioFormat = m_audioInputStream.getFormat();
			trace(1,getClass().getName(), "Create Line : ", audioFormat.toString());
			DataLine.Info	info = new DataLine.Info(SourceDataLine.class, audioFormat, AudioSystem.NOT_SPECIFIED);
			m_line = (SourceDataLine) AudioSystem.getLine(info);

			/*-- Display supported controls --*/
			Control[] c = m_line.getControls();
			for (int p=0;p<c.length;p++)
			{
				trace(2,getClass().getName(), "Controls : "+c[p].toString());
			}
			/*-- Is Gain Control supported ? --*/
			if (m_line.isControlSupported(FloatControl.Type.MASTER_GAIN))
			{
				m_gainControl = (FloatControl) m_line.getControl(FloatControl.Type.MASTER_GAIN);
				trace(1,getClass().getName(), "Master Gain Control : ["+m_gainControl.getMinimum()+","+m_gainControl.getMaximum()+"]",""+m_gainControl.getPrecision());
			}

			/*-- Is Pan control supported ? --*/
			if (m_line.isControlSupported(FloatControl.Type.PAN))
			{
				m_panControl = (FloatControl) m_line.getControl(FloatControl.Type.PAN);
				trace(1,getClass().getName(), "Pan Control : ["+ m_panControl.getMinimum()+","+m_panControl.getMaximum()+"]",""+m_panControl.getPrecision());
			}
		}
	}


	/**
	 * Opens the line.
	 */
	private void openLine() throws LineUnavailableException
	{
		if (m_line != null)
		{
			AudioFormat	audioFormat = m_audioInputStream.getFormat();
			trace(1,getClass().getName(), "AudioFormat : "+audioFormat);
			m_line.open(audioFormat, m_line.getBufferSize());
		}
	}

	/**
	 * Stops the playback.<br>
	 *
	 * Player Status = STOPPED.<br>
	 * Thread should free Audio ressources.
	 */
	protected void stopPlayback()
	{
		if ( (m_status == PLAYING) || (m_status == PAUSED) )
		{
			if (m_line != null)
			{
				m_line.flush();
				m_line.stop();
			}
			m_status = STOPPED;
			trace(1,getClass().getName(), "Stop called");
		}
	}

	/**
	 * Pauses the playback.<br>
	 *
	 * Player Status = PAUSED.
	 */
	public void pausePlayback()
	{
		if (m_line != null)
		{
			if (m_status == PLAYING)
			{
				m_line.flush();
				m_line.stop();
				m_status = PAUSED;
				trace(1,getClass().getName(), "Pause called");
			}
		}
	}

	/**
	 * Resumes the playback.<br>
	 *
	 * Player Status = PLAYING.
	 */
	public void resumePlayback()
	{
		if (m_line != null)
		{
			if (m_status == PAUSED)
			{
				m_line.start();
				m_status = PLAYING;
				trace(1,getClass().getName(), "Resume called");
			}
		}
	}

	/**
	 * Starts playback.
	 */
	public String startPlayback()
	{
		if ((m_status == STOPPED) || (m_status == READY))
		{
			trace(1,getClass().getName(), "Start called");
			if (!(m_thread == null || !m_thread.isAlive()))
			{
				trace(1,getClass().getName(), "WARNING: old thread still running!!");
				while (m_status != READY)
				{
					try
					{
						if (m_thread != null) m_thread.sleep(1000);
					} catch (Exception e)
					  {
						  trace(1,getClass().getName(), "Waiting Error : "+e.getMessage());
					  }
					trace(1,getClass().getName(), "Waiting ...");