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POjava - for loop is executing more times than it should - metronome program
 

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  1. POjava - for loop is executing more times than it should - metronome program
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    <p>I am creating a metronome program and the for loop is executing +1 times than it should. </p> <pre><code>public class Tempo { String file; int bpm; public Tempo(int bpm, String file){ this.bpm=bpm; this.file=file; } public void tempoPlay () throws InterruptedException{ new Play(file).start(); Thread.sleep(60000/bpm); } public static void main(String[] args) throws InterruptedException { Tempo t = new Tempo(120, "C:\\Users\\Korisnik\\Desktop\\dome3.wav"); for(int i=0;i&lt;20;i++){ t.tempoPlay(); } } } </code></pre> <p>The first beat is rapidly followed by the second one but later as it goes it is sounding compliant. I've counted it plays 21 beats but it should play 20. Here's the Play class:</p> <pre><code>import java.io.File; import java.io.IOException; import javax.sound.sampled.AudioFormat; import javax.sound.sampled.AudioInputStream; import javax.sound.sampled.AudioSystem; import javax.sound.sampled.DataLine; import javax.sound.sampled.FloatControl; import javax.sound.sampled.LineUnavailableException; import javax.sound.sampled.SourceDataLine; import javax.sound.sampled.UnsupportedAudioFileException; class Play extends Thread { private String filename; private Position curPosition; private final int EXTERNAL_BUFFER_SIZE = 524288; // 128Kb enum Position { LEFT, RIGHT, NORMAL }; public Play(String wavfile) { filename = wavfile; curPosition = Position.NORMAL; } public Play(String wavfile, Position p) { filename = wavfile; curPosition = p; } @Override public void run() { File soundFile = new File(filename); if (!soundFile.exists()) { System.err.println("Wave file not found: " + filename); return; } AudioInputStream audioInputStream = null; try { audioInputStream = AudioSystem.getAudioInputStream(soundFile); } catch (UnsupportedAudioFileException e1) { e1.printStackTrace(); return; } catch (IOException e1) { e1.printStackTrace(); return; } AudioFormat format = audioInputStream.getFormat(); SourceDataLine auline = null; DataLine.Info info = new DataLine.Info(SourceDataLine.class, format); try { auline = (SourceDataLine) AudioSystem.getLine(info); auline.open(format); } catch (LineUnavailableException e) { e.printStackTrace(); return; } catch (Exception e) { e.printStackTrace(); return; } if (auline.isControlSupported(FloatControl.Type.PAN)) { FloatControl pan = (FloatControl) auline .getControl(FloatControl.Type.PAN); if (curPosition == Position.RIGHT) { pan.setValue(1.0f); } else if (curPosition == Position.LEFT) { pan.setValue(-1.0f); } } auline.start(); int nBytesRead = 0; byte[] abData = new byte[EXTERNAL_BUFFER_SIZE]; try { while (nBytesRead != -1) { nBytesRead = audioInputStream.read(abData, 0, abData.length); if (nBytesRead &gt;= 0) { auline.write(abData, 0, nBytesRead); } } } catch (IOException e) { e.printStackTrace(); return; } finally { auline.drain(); auline.close(); } } } </code></pre>
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    1. PTQuestion
    1. USAndrew Thompson
    1. USMihajel Petrovic
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      1. POjava - for loop is executing more times than it should - metronome program
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      1. VTUpMod
    1. CO1) I suggest to use a `Clip` for this. It has handy methods like [`loop(int)`](http://docs.oracle.com/javase/7/docs/api/javax/sound/sampled/Clip.html#loop%28int%29) See an example on the [Java Sound tag Wiki](http://stackoverflow.com/tags/javasound/info) 2) If a method requires a `File`, specify a `File` in the signature and be done with it, passing around strings that represent file paths leads to no end of confusion. 3) But having said that, unless you are getting the sound from the user (unlikely), the clip will need to be referenced by `URL` at run-time.
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      1. POjava - for loop is executing more times than it should - metronome program
      1. USAndrew Thompson
    2. COI ran your program adding a couple of `System.out.prints` in run (init/end) and after sorting the output and counting the line number, I got 20 calls to `run()`, beside that, using a different wav file (with a different sleep time that lets the plays to be solapated enough) I could clearly hear the file being played 20 times. Are you completely sure that there are 21 plays?
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      1. POjava - for loop is executing more times than it should - metronome program
      1. UShiguaro
 

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