I have to convert a matlab code into Android. This matlab code contains energy calculation as shown below:
first I read the audio file into matrix x, and the sample frequency into fs, and then calculate the energy for each window:
[x, fs] = wavread('C:\1359873105438.wav')
energy=energy+sum(x(1:fs).^2)*Tss;
I am not sure how to convert this into Android/Java.
Have you been through this before? please help me to get over this problem.
thanks in advance for your help
Essentially, you have to do something like this:
double x;//Read Wave in here
for (i=0;i<x.length;i++)
{
energy+=Tss*(x[i]^2);
}
How to read the wave files borrowed from this article.
public class ReadExample
{
public static void main(String[] args)
{
try
{
// Open the wav file specified as the first argument
WavFile wavFile = WavFile.openWavFile(new File(args[0]));
// Get the number of audio channels in the wav file
int numChannels = wavFile.getNumChannels();
// Create a buffer of 100 frames
double[] buffer = new double[100 * numChannels];
int framesRead;
do
{
// Read frames into buffer
framesRead = wavFile.readFrames(buffer, 100);
// Loop through frames and look for minimum and maximum value
for (int s=0 ; s<framesRead * numChannels ; s++)
{
//This is where you put the your code in
}
}
while (framesRead != 0);
// Close the wavFile
wavFile.close();
}
catch (Exception e)
{
System.err.println(e);
}
}
}
Bottom line is, there isn't a nice clean way to do it like there is in matlab. There isn't even a function to directly read in a wave file. Still, it's relatively straight forward, using the WavFile class the website provides.