Manipulating audio data with filters
yeti349_at_yahoo.com
Date: 12/31/04
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Date: 30 Dec 2004 16:28:28 -0800
Hi. I'm trying to capture .wav data and manipulate it using filters,
etc... I've read a million posts on this topic, but I'm still at a loss
as to my next move.
I believe the following code successfully converts audio byte[] data to
a short array. When you run it from the command line you'll get data
like:
-94
2822
-1
-43
-110
-1
-92
-89
74
314
Exactly what does this data represent? Is this data ready to have a FFT
run on it?
How do I go about drawing the waveform of this data?
Please have a look at the code and let me know how I should proceed to
accomplish these tasks. Thanks for the help!
import java.io.*;
import java.nio.*;
import java.net.*;
import java.awt.*;
import java.util.*;
import java.lang.*;
import java.math.*;
import javax.media.*;
import javax.swing.*;
import java.lang.Long.*;
import javax.sound.sampled.*;
public class Filters {
final double pi = Math.PI;
private Player audioPlayer = null;
private int frameRate;
private AudioInputStream audioInput;
public static void main(String args[]) {
int numChannels,frameLengthInt;
int totalFrames = 0;
long frameLengthLong;
byte[] audioData;
double[] doubArray;
SourceDataLine sourceData;
AudioInputStream audioInput;
ByteArrayOutputStream byteOut;
String output = "";
try {
if (args.length == 1) {
File sourceFile = new File(args[0]);
//File targetFile = new File(args[1]);
//audio player for file
Filters player = new Filters(sourceFile);
//put audio data into an input stream
audioInput =
AudioSystem.getAudioInputStream(sourceFile);
//output stream
byteOut = new ByteArrayOutputStream();
//get the file format info.
AudioFileFormat fileFormat =
AudioSystem.getAudioFileFormat(sourceFile);
//get file type (.wav, .au...etc)
AudioFileFormat.Type targetFileType =
fileFormat.getType();
//get the total length of the file
frameLengthLong = audioInput.getFrameLength();
//convert long to int
frameLengthInt = (int)frameLengthLong;
//get channels: mono=(1,2), stereo=(4)
numChannels = audioInput.getFormat().getFrameSize();
//total bytes of file
int numBytes = frameLengthInt * numChannels;
//put total bytes into binary form
audioData = new byte[numBytes];
//play audio file
player.play();
try {
int numBytesRead = 0;
int numFramesRead = 0;
while((numBytesRead = audioInput.read(audioData))
!= -1) {
numFramesRead = numBytesRead/numChannels;
totalFrames += numFramesRead;
short[] shortArray = new short[numBytes/2];
for (int x = 0; x < numBytes/2; x++) {
shortArray[x] = (short)
((audioData[x * numChannels + 1] << 8 ) |
audioData[x * numChannels + 0]);
if (shortArray[x] != 0) {
System.out.println(shortArray[x]);
}
}
}
}
catch (Exception ex) {}
//System.out.println("file format: ");
//create byte array input stream
//ByteArrayInputStream bAIS = new
ByteArrayInputStream(audioData);
//AudioInputStream opAIS = new AudioInputStream(
// bAIS,
// audioFormat,
// audioData.length / audioFormat.getFrameSize());
//write modifed data to target file
//int nWrittenBytes = AudioSystem.write(
// opAIS,
// targetFileType,
// targetFile);
}
else { usage();}
System.exit(0);
}
catch (Exception ex) {}
} //end main
// create media player
public Filters(URL url) throws IOException, NoPlayerException,
CannotRealizeException {
audioPlayer = Manager.createRealizedPlayer(url);
}
public Filters(File file) throws IOException, NoPlayerException,
CannotRealizeException {
this(file.toURL());
}
// play and stop file
public void play() {
audioPlayer.start();
}
public void stop() {
audioPlayer.stop();
audioPlayer.close();
}
// usage display
public static void usage() {
System.out.println("Usage: java Filters inputFile");
}
} //end class
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