Display sound data value from ByteArrayOutputStream

Question

hi People,
Can advise what is the function that i can use to retrieve or display the data that i stored in ByteArrayoutputStream buffer?
So far i can only store the data in... but how can i retrieve and display them on output panel?
Many Thanks

Answer 1

Hi again,
I have modify my code and found the error.. But this time i can't display the value correctly. Please advise...
//This method captures audio input from a microphone and saves it in a ByteArrayOutputStream object.
private void captureAudio(){
try{
//Get and display a list of available mixers.
Mixer.Info[] mixerInfo = AudioSystem.getMixerInfo();
System.out.println("Available mixers:");
for(int cnt = 0; cnt < mixerInfo.length; cnt++){
System.out.println(mixerInfo[cnt].getName());
}//end for loop
//Get everything set up for capture
audioFormat = getAudioFormat();
DataLine.Info dataLineInfo = new DataLine.Info(TargetDataLine.class,audioFormat);
//Select one of the available mixers.
Mixer mixer = AudioSystem.getMixer(mixerInfo[3]);
//Get a TargetDataLine on the selected mixer.
targetDataLine = (TargetDataLine)mixer.getLine(dataLineInfo);
//Prepare the line for use.
targetDataLine.open(audioFormat);
targetDataLine.start();
//Create a thread to capture the microphone
// data and start it running. It will run
// until the Stop button is clicked.
Thread captureThread = new CaptureThread();
captureThread.start();
} catch (Exception e) {
System.out.println(e);
System.exit(0);
}//end catch
}//end captureAudio method
public int[] ConvertSoundData (byte[] SoundData, int SampleTotal){
//Determine the original Endian encoding format
boolean isBigEndian = audioFormat.isBigEndian();
//this array is the value of the signal at time i*h
int x[] = new int[SampleTotal];
int value;
//convert each pair of byte values from the byte array to an Endian value
for (int i = 0; i < SampleTotal*2; i+=2) {
int b1 = SoundData;
     int b2 = SoundData[i + 1];
     if (b1 < 0) b1 += 0x100;
     if (b2 < 0) b2 += 0x100;
     //Store the data based on the original Endian encoding format
     if (!isBigEndian) value = (b1 << 8) + b2;
     else value = b1 + (b2 << 8);
     x[i/2] = value;
return x;
//This method creates and returns an
// AudioFormat object for a given set of format
// parameters. If these parameters don't work
// well for you, try some of the other
// allowable parameter values, which are shown
// in comments following the declartions.
private AudioFormat getAudioFormat(){
float sampleRate = 8000.0F;
//8000,11025,16000,22050,44100
int sampleSizeInBits = 16;
//8,16
int channels = 1;
//1,2
boolean signed = true;
//true,false
boolean bigEndian = false;
//true,false
return new AudioFormat(
sampleRate,
sampleSizeInBits,
channels,
signed,
bigEndian);
}//end getAudioFormat
//=============================================//
//Inner class to capture data from microphone
class CaptureThread extends Thread{
//An arbitrary-size temporary holding buffer
byte tempBuffer[] = new byte[10000];
public void run(){
byteArrayOutputStream = new ByteArrayOutputStream();
stopCapture = false;
try{//Loop until stopCapture is set by another thread that services the Stop button.
while(!stopCapture){
//Read data from the internal buffer of the data line.
//targetDataLine.read(byte[] b, int off, int len)
int cnt = targetDataLine.read(tempBuffer, 0, tempBuffer.length);
if(cnt > 0){
float sample_rate = audioFormat.getSampleRate();
float T = audioFormat.getFrameSize() / audioFormat.getFrameRate();
int n = (int) (sample_rate * T ) / 2;
System.out.println(n); ---------> to print the number of sample
//Save data in output stream object.
byteArrayOutputStream.write(tempBuffer, 0, cnt);
int[] SoundData = ConvertSoundData(tempBuffer,n);
for(int index = 0; index < SoundData.length; index++){
System.out.println(index + " " + SoundData[index]); ----------> to print the ALL sound data in the returned array.
}//end if
}//end while
byteArrayOutputStream.close();
}catch (Exception e) {
System.out.println(e);
System.exit(0);
}//end catch
}//end run
}//end inner class CaptureThread
The result i got during i sing "hmmm" to my microphone is as below:
1
0 1281
1
0 61184
1
0 24830
1
0 25598
1
0 33279
1
0 25350
1
0 19728
1
0 54537
Below is my question:
1) Why the number of sample keep on remained as 1? Since the sampling frequency is 8000Hz..
2) Why my index variable remained as 0? I suppose i will have 8000 values since my sampling rate is 8000Hz... Is it impossible to print 8000 data within 1 sec?
Is it advisable if i transfer the obtained numeric array directly for FFT analysis?
(I wish to do a real time frequency analyzer. With MATLAB, I can only do an analyzer by retrieving the .wav data content.)
I am shame to say i am still not clear enough with the sampling and data retrieve algorithm. Thats why i will have difficulties to delliver correct idea.
Appreciate if you have any tutorial can share with me so that i can understand more.
Thank you again.