How to have control on audio (wave file ), like pause, resume, forward, rewind

Java Sound & OpenAL
#1

Hi all,

I’m developing audio mixer to play audio (wave files) and to have control on it.
I’m able to play and stop the audio with AudioInputStream and SourceDataLine. But unable to pause and resume the playing/running audio file. :frowning:
Can any on help me how to get the control on audio file like pause, resume and forward/rewind (5sec, 10sec,…). :-[ .

I’m attaching the code, which I’m using for my application.


/*
 * Created on Aug 5, 2005
 */
package Samples.audio;

import java.io.File;
import java.io.IOException;

import java.net.URL;

import javax.sound.sampled.AudioFormat;
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;
/**
 * @author vinesh
 */
public class FoundationAudioStream 
	implements	Runnable{
		// better size
		private static final int	EXTERNAL_BUFFER_SIZE = 4000 * 4;

		private Thread				m_thread = null;
		private Object				m_dataSource;
		private AudioInputStream	m_audioInputStream;
		private SourceDataLine		m_sourceDataLine;
		public static long 			lastMicrosecondPosition=0;
		public static long 			currentMicrosecondPosition=0;
		
		private boolean 			pauseFlag=false;
		private int 				pauseCount;
		private int 				bufferSize;
		private int 				audioLength;         	// Length of the sound.
		public static	int 		audioPosition = 0;   	// Current position within the sound
		/**	This variable is used to distinguish stopped state from paused state. */
		private boolean			m_bRunning;

		protected FoundationAudioStream()
		{
			m_dataSource = null;
			m_audioInputStream = null;
			m_sourceDataLine = null;
			m_gainControl = null;
			m_panControl = null;
		}

		protected void setDataSource(File file)
			throws	UnsupportedAudioFileException, LineUnavailableException, IOException
		{
			m_dataSource = file;
			initAudioInputStream();
		}

		private void initAudioInputStream()
			throws	UnsupportedAudioFileException, LineUnavailableException, IOException{
			if (m_dataSource instanceof File)initAudioInputStream((File) m_dataSource);
		}

		private void initAudioInputStream(File file)
			throws	UnsupportedAudioFileException, IOException{
				m_audioInputStream = AudioSystem.getAudioInputStream(file);
				bufferSize = (int)file.length();
		}

		protected void initLine()
			throws	LineUnavailableException{
			if (m_sourceDataLine == null){
				createLine();
				openLine();
			}else{
				AudioFormat	lineAudioFormat = m_sourceDataLine.getFormat();
				AudioFormat	audioInputStreamFormat = m_audioInputStream == null ? null : m_audioInputStream.getFormat();
				if (!lineAudioFormat.equals(audioInputStreamFormat)){
					m_sourceDataLine.close();
					openLine();
				}
			}
		}

		private void createLine()
			throws	LineUnavailableException{
			if (m_sourceDataLine != null)return;
			AudioFormat	audioFormat = m_audioInputStream.getFormat();
			DataLine.Info	info = 
				new DataLine.Info(SourceDataLine.class, audioFormat, AudioSystem.NOT_SPECIFIED);
			m_sourceDataLine = (SourceDataLine) AudioSystem.getLine(info);
			
			/** reseting the lastMicrosecondPosition for progress bar. */
			lastMicrosecondPosition=0;
		}

		private void openLine()
			throws	LineUnavailableException{
			if (m_sourceDataLine == null)return;
			AudioFormat	audioFormat = m_audioInputStream.getFormat();
			m_sourceDataLine.open(audioFormat, m_sourceDataLine.getBufferSize());
		}

		/** Start the audio */
		public void start()
		{
			if (!(m_thread == null || !m_thread.isAlive()))
					out("WARNING: old thread still running!!");
			m_thread = new Thread(this);
			m_thread.start();
			m_sourceDataLine.start();
		}

		/** Stop the audio. */
		protected void stop()
		{
			if (m_bRunning)
			{
				if (m_sourceDataLine != null)
				{
					lastMicrosecondPosition=m_sourceDataLine.getMicrosecondPosition();
					m_sourceDataLine.stop();
					m_sourceDataLine.flush();
				}
				m_bRunning = false;
				/**	We re-initialize the AudioInputStream. */
				try{
					initAudioInputStream();
				}catch (UnsupportedAudioFileException e){}
				 catch (LineUnavailableException e){}
				 catch (IOException e){}
			}
		}

		/** Pause the audio */
		public void pause(){
			m_sourceDataLine.stop();}

		/** Continue playing audio after pause */
		public void resume(){
			m_sourceDataLine.start();}

	    /** Stop playing the audio and reset the position to 0 on progress bar */
	    public void resetAudio( ) {
	        stop( );
	        audioPosition = 0; 
	        TestAudioPlayer.songPerMillisecond.setValue(0);
	    }
	    
		public void run()
		{
			int	nBytesRead = 0;
			m_bRunning = true;
			byte[]	abData = new byte[EXTERNAL_BUFFER_SIZE];
			int currentCount=0;
			while (nBytesRead != -1 && m_bRunning)
			{
				try{
					nBytesRead = m_audioInputStream.read(abData, 0, abData.length);
				}catch (IOException e){
					e.printStackTrace();}
				if (nBytesRead >= 0 )
					int	nBytesWritten = m_sourceDataLine.write(abData, 0, nBytesRead);
			}
			/** for pause to lock the song played */
			if(pauseFlag)pauseCount=currentCount;
			m_sourceDataLine.drain();
			stop();

			/** Reset the progress bar position after audio is completed. */
			lastMicrosecondPosition=m_sourceDataLine.getMicrosecondPosition();
			if(!TestAudioPlayer.start.isEnabled())TestAudioPlayer.start.setEnabled(true);
			if(!TestAudioPlayer.select.isEnabled())TestAudioPlayer.select.setEnabled(true);
		}

		private static void out(String strMessage){
			System.out.println(strMessage);
		}

}

When I call pause method the audio will stop playing, but when I call resume method the audio will drain and stop playing. :frowning:

-vinesh