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| import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.nio.ByteBuffer;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JSlider;
import javax.swing.SwingConstants;
public class JFrame_sliderSine extends JFrame {
/**
*
*/
private static final long serialVersionUID = 3481827887325136254L;
private SampleThread m_thread;
private JSlider m_sliderPitch;
//Launch the app
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
JFrame_sliderSine frame = new JFrame_sliderSine();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public JFrame_sliderSine() {
//UI stuff, created with WindowsBuilder
addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
m_thread.exit();
System.exit(0);
}
});
setTitle("Slider Frequency Sine Wave Demo");
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 793, 166);
setLocationRelativeTo(null);
getContentPane().setLayout(new BorderLayout(0, 0));
m_sliderPitch = new JSlider();
m_sliderPitch.setName("");
m_sliderPitch.setMinimum(100);
m_sliderPitch.setPaintLabels(true);
m_sliderPitch.setPaintTicks(true);
m_sliderPitch.setMajorTickSpacing(500);
m_sliderPitch.setMinorTickSpacing(100);
m_sliderPitch.setMaximum(4100);
m_sliderPitch.setValue(880);
getContentPane().add(m_sliderPitch);
JLabel lblAdjustPitch = new JLabel("Adjust pitch");
lblAdjustPitch.setHorizontalAlignment(SwingConstants.CENTER);
lblAdjustPitch.setFont(new Font("Tahoma", Font.PLAIN, 18));
getContentPane().add(lblAdjustPitch, BorderLayout.NORTH);
//Non-UI stuff
m_thread = new SampleThread();
m_thread.start();
}
class SampleThread extends Thread{
final static public int SAMPLING_RATE = 44100;
final static public int SAMPLE_SIZE = 2; //Sample size in bytes
final static public double BUFFER_DURATION = 0.426; //About a 500ms buffer
//You can play with the size of this buffer if you want. Making it smaller speeds up
//the response to the slider movement, but if you make it too small you will get
//noise in your output from buffer underflows, etc...
// Size in bytes of sine wave samples we'll create on each loop pass
final static public int SINE_PACKET_SIZE = (int)(BUFFER_DURATION * SAMPLING_RATE * SAMPLE_SIZE);
SourceDataLine line; //$
public double fFreq;
public boolean bExitThread = false;
//Get the number of queued samples in the SourceDataLine buffer
private int getLineSampleCount() {
return line.getBufferSize() - line.available();
}
//Continually fill the audio output buffer whenever it starts to get empty, SINE_PACKET_SIZE/2
//samples at a time, until we tell the thread to exit
public void run() {
//Position through the sine wave as a percentage (i.e. 0-1 is 0-2*PI)
double fCyclePosition = 0;
//Open up the audio output, using a sampling rate of 44100hz, 16 bit samples, mono, and big
// endian byte ordering. Ask for a buffer size of at least 2*SINE_PACKET_SIZE
try {
AudioFormat format = new AudioFormat(44100, 16, 1, true, true);
DataLine.Info info = new DataLine.Info(SourceDataLine.class, format, SINE_PACKET_SIZE * 2);
if(!AudioSystem.isLineSupported(info)) throw new LineUnavailableException();
line = (SourceDataLine)AudioSystem.getLine(info);
line.open(format);
line.start();
} catch (LineUnavailableException e){
System.out.println("Line of that type is not available");
e.printStackTrace();
System.exit(-1);
}
System.out.println("Requested line buffer size = " + SINE_PACKET_SIZE*2);
System.out.println("Actual line buffer size = " + line.getBufferSize());
ByteBuffer cBuff = ByteBuffer.allocate(SINE_PACKET_SIZE);
//On each pass main loop fills the available free space in the audio buffer
//Main loop creates audio samples for sine wave, runs until we tell the thread to exit
//Each sample is spaced 1/SAMPLING_RATE apart in time
while(bExitThread == false) {
fFreq = m_sliderPitch.getValue();
double fCycleInc = fFreq / SAMPLING_RATE; //Fraction of cycle between samples
cBuff.clear(); //Toss out samples from previous pass
//Generate SINE_PACKET_SIZE samples based on the current fCycleInc from fFreq
for(int i = 0; i < SINE_PACKET_SIZE / SAMPLE_SIZE; i++){
cBuff.putShort((short)(Short.MAX_VALUE * Math.sin(2 * Math.PI * fCyclePosition)));
fCyclePosition += fCycleInc;
if(fCyclePosition > 1) fCyclePosition -= 1;
}
//Write sine samples to the line buffer
// If the audio buffer is full, this would block until there is enough room,
// but we are not writing unless we know there is enough space.
line.write(cBuff.array(), 0, cBuff.position());
//Wait here until there are less than SINE_PACKET_SIZE samples in the buffer
//(Buffer size is 2*SINE_PACKET_SIZE at least, so there will be room for
// at least SINE_PACKET_SIZE samples when this is true)
try {
while(getLineSampleCount() > SINE_PACKET_SIZE) Thread.sleep(1);
} catch (InterruptedException e) {
}
}
line.drain();
line.close();
}
public void exit() {
bExitThread = true;
}
}
} |
valeur de BUFFER_DURATION
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