Hi,
I downloaded the open source project Guitar Tuner (http://sourceforge.net/projects/guitartuner/)
Inside it there is an index.html file, a TunerApplet.jar file and a TunerApplet.java file (As well as some images and GPL etc.)
When i open index.html the applet displays as it should however if I try to recompile (Even without making any changes to the code) I get an error.
I am compiling with the command Sam-Rudges-MacBook-Pro:GuitarTuner samarudge$ javac tunerapplet.java then putting it all into a .jar archive using Sam-Rudges-MacBook-Pro:GuitarTuner samarudge$ jar cvf TunerApplet.jar TunerApplet.class But when I open the web page again (After closing FireFox and clearing cache) the applet displays but shows the error
"Error: Unable To Start Acquisition"
If you look in the code (below) the string from the error is on line 111
/*
GuitarTuner : automatic Guitar Tuner on Applet
Copyright (C) 2005 (Arnault PACHOT)
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 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
Contact : Arnault PACHOT
"OpenStudio, Editeur de logiciels libres"
Le bourg, 43160 Saint Pal de Senouire, FRANCE.
info@openstudio.fr*/
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import javax.sound.sampled.*;
import java.net.*;
import java.io.*;
public class TunerApplet extends Applet implements MouseListener, ActionListener, MouseMotionListener
{
Image img;
Image imgE;
Image imgA;
Image imgD;
Image imgG;
Image imgB;
Image imgSelected = null;
TargetDataLine targetDataLine;
CaptureThread captureThread;
AudioFormat audioFormat;
double freqMin = 77.781;
double freqMax = 87.307;
double freqOK = 82.406;
int coordSelectedx = 70;
int coordSelectedy = 134;
int xPos = 171;
int yPos = 98-40;
int dispError = 0;
Panel infoPanel = new Panel();
Button closeButton = new Button("Close");
boolean bStopTuner = false;
public void start ()
{
img = getImage(getCodeBase(),"TunerApplet.jpg");
imgE = getImage(getCodeBase(),"Eselected.jpg");
imgA = getImage(getCodeBase(),"Aselected.jpg");
imgD = getImage(getCodeBase(),"Dselected.jpg");
imgG = getImage(getCodeBase(),"Gselected.jpg");
imgB = getImage(getCodeBase(),"Bselected.jpg");
imgSelected = imgE;
this.addMouseListener(this);
this.addMouseMotionListener(this);
infoPanel.setLayout(new BorderLayout());
Panel buttonPanel = new Panel();
Label titleLabel = new Label("GuitarTuner");
TextArea infoArea = new TextArea("GuitarTuner has been developed by OpenStudio\nwww.openstudio.fr\nCopyright (2005) Arnault Pachot.\n\nThis 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 any later version.\n\nThis 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. (see http://www.gnu.org/copyleft/gpl.html)\n\nYou should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.\n\nContact : Arnault PACHOT\nOpenStudio, Editeur de logiciels libres\nLe bourg, 43160 Saint Pal de Senouire, FRANCE.\ninfo@openstudio.fr\n", 8, 40, TextArea.SCROLLBARS_VERTICAL_ONLY );
infoArea.setBackground(Color.lightGray);
buttonPanel.add(closeButton);
buttonPanel.setBackground(Color.lightGray);
closeButton.addActionListener(this);
//infoPanel.add(titleLabel);
infoPanel.setBackground(Color.lightGray);
infoPanel.add(infoArea);
infoPanel.add(buttonPanel, BorderLayout.SOUTH);
infoPanel.setVisible(false);
add(infoPanel);
audioFormat = new AudioFormat(8000.0F,8,1,true,false);
DataLine.Info dataLineInfo = new DataLine.Info(TargetDataLine.class,audioFormat);
try
{
targetDataLine = (TargetDataLine)AudioSystem.getLine(dataLineInfo);
targetDataLine.open(audioFormat);
captureThread = new CaptureThread();
captureThread.start();
}
catch (Exception e2)
{
dispError = 1;
repaint();
System.out.println("Error : Unable to start acqusition -> "+e2);
}
}
public class CaptureThread extends Thread
{
public void run()
{
try
{
int cnt2 = 0;
int spectreSize = 2048*2*2*2*2;
int sampleSize = 2048*2*2;
double divi = 4*2*(4096/4000);
byte data[] = new byte[spectreSize];
int valtemp = 0;
targetDataLine.start();
int nbValues = 0;
double tempValue = 0;
int nbMesures = 1;
double[] ar = new double[spectreSize];
double[] ai = new double[spectreSize];
while(((cnt2 = targetDataLine.read(data,0,sampleSize)) > 0))
{
try
{
for(int i = 0; i < sampleSize; i++)
{
ar[i] = (double)data[i];
ai[i] = 0.0;
}
for (int i=sampleSize; i<spectreSize; i++)
{
ar[i] = 0.0;
ai[i] = 0.0;
}
computeFFT(1, spectreSize, ar, ai);
double maxFreq = 0;
double maxAmpl = 0;
double maxIndex = 0;
double erreur = 0;
for (int i=(int)(freqMin*divi); i<(freqMax*divi);i++)
{
if (Math.abs(ai[i]) > maxAmpl)
{
maxFreq = ar[i];
maxAmpl = Math.abs(ai[i]);
maxIndex = i;
}
}
if(maxAmpl > 0.01)
{
erreur = ((maxIndex/divi - freqOK) / (freqOK - freqMin));
tempValue += erreur;
nbValues+=1;
if (nbValues > (nbMesures - 1))
{
double angle = ((tempValue / nbMesures)) -0.25;
xPos = (int)(40*Math.sin(angle) + 171);
yPos = (int)(98 - (40*Math.cos(angle) ) );
nbValues = 0;
tempValue = 0;
repaint();
}
}
}
catch (Exception e2)
{
System.out.println(e2);
}
targetDataLine.flush();
}
}
catch (Exception e)
{
System.out.println(e);
System.exit(0);
}
}
}
public static void computeFFT(int sign, int n, double[] ar, double[] ai)
{
double scale = 2.0 / (double)n;
int i, j;
for(i = j = 0; i < n; ++i)
{
if (j >= i)
{
double tempr = ar[j] * scale;
double tempi = ai[j] * scale;
ar[j] = ar[i] * scale;
ai[j] = ai[i] * scale;
ar[i] = tempr;
ai[i] = tempi;
}
int m = n/2;
while ((m >= 1) && (j >= m))
{
j -= m;
m /= 2;
}
j += m;
}
int mmax, istep;
for(mmax = 1, istep = 2 * mmax; mmax < n; mmax = istep, istep = 2 * mmax)
{
double delta = sign * Math.PI / (double)mmax;
for(int m = 0; m < mmax; ++m)
{
double w = m * delta;
double wr = Math.cos(w);
double wi = Math.sin(w);
for(i = m; i < n; i += istep)
{
j = i + mmax;
double tr = wr * ar[j] - wi * ai[j];
double ti = wr * ai[j] + wi * ar[j];
ar[j] = ar[i] - tr;
ai[j] = ai[i] - ti;
ar[i] += tr;
ai[i] += ti;
}
}
mmax = istep;
}
}
public void paint(Graphics g)
{
if (img!=null)
{
g.drawImage(img,0,0,350, 200,this);
if (imgSelected!=null)
{
g.drawImage(imgSelected,coordSelectedx,coordSelectedy,this);
}
g.setColor(Color.black);
g.drawLine(xPos, yPos, 171, 98);
}
else
{
g.drawString("Loading...",20,60);
}
if (dispError == 1)
{
g.setColor(Color.black);
g.drawString("Error : Unable to start acquisition",86,124);
}
}
public void mouseClicked(MouseEvent e)
{
int x = e.getX();
int y = e.getY();
int selectedNote = 0;
if (x > 74 && y > 137 && x < 94 && y < 154)
{
freqMin = 77.781;
freqMax = 87.307;
freqOK = 82.406;
imgSelected = imgE;
coordSelectedx = 70;
}
if (x > 110 && y > 137 && x < 128 && y < 154)
{
freqMin = 103.826;
freqMax = 116.540;
freqOK = 110.0;
imgSelected = imgA;
coordSelectedx = 106;
}
if (x > 144 && y > 137 && x < 163 && y < 154)
{
freqMin = 138.591;
freqMax = 155.563;
freqOK = 146.832;
imgSelected = imgD;
coordSelectedx = 141;
}
if (x > 180 && y > 137 && x < 199 && y < 154)
{
freqMin = 184.997;
freqMax = 207.652;
freqOK = 195.997;
imgSelected = imgG;
coordSelectedx = 176;
}
if (x > 214 && y > 137 && x < 236 && y < 154)
{
freqMin = 233.081;
freqMax = 261.625;
freqOK = 246.941;
imgSelected = imgB;
coordSelectedx = 212;
}
if (x > 248 && y > 137 && x < 268 && y < 154)
{
freqMin = 311.126;
freqMax = 349.228;
freqOK = 329.627;
imgSelected = imgE;
coordSelectedx = 247;
}
if (x > 24 && y > 179 && x < 313 && y < 198)
{
infoPanel.setVisible(true);
validate();
repaint();
}
repaint();
}
public void mouseMoved(MouseEvent e)
{
int x = e.getX();
int y = e.getY();
if (x > 24 && y > 179 && x < 313 && y < 198)
{
setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
}
else
{
setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
}
}
//========================================================== ignored
//==== the other motion events must be here, but do nothing.
public void mouseDragged (MouseEvent e) {} // ignore
//==== these "slow" mouse events are ignored.
public void mouseEntered (MouseEvent e) {} // ignore
public void mouseExited (MouseEvent e) {} // ignore
public void mousePressed (MouseEvent e) {} // ignore
public void mouseReleased(MouseEvent e) {} // ignore
public void actionPerformed(ActionEvent evt)
{
if (evt.getSource()==closeButton)
{
infoPanel.setVisible(false);
repaint();
}
}
}I have even tried signing the file using Sam-Rudges-MacBook-Pro:GuitarTuner samarudge$ keytool -genkey -alias Tuner -keypass authentic -keystore Tuner -storepass authentic then Sam-Rudges-MacBook-Pro:GuitarTuner samarudge$ jarsigner -keystore Tuner -storepass authentic -keypass authentic TunerApplet.jar Tuner I am quite new to Java and was expecting just to be able to edit the file, compile and .jar it then possibly digitally sign it
What am I doing wrong?
Thanx,
Sam Rudge
