package com.darkprograms.speech.recognizer;
import javaFlacEncoder.FLACEncoder;
import javaFlacEncoder.FLACFileOutputStream;
import javaFlacEncoder.StreamConfiguration;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import java.io.File;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
/*************************************************************************************************************
* Class that contains methods to encode Wave files to FLAC files
* THIS IS THANKS TO THE javaFlacEncoder Project created here: http://sourceforge.net/projects/javaflacencoder/
************************************************************************************************************/
public class FlacEncoder {
/**
* Constructor
*/
public FlacEncoder() {
}
/**
* Converts a wave file to a FLAC file(in order to POST the data to Google and retrieve a response) <br>
* Sample Rate is 8000 by default
*
* @param inputFile Input wave file
* @param outputFile Output FLAC file
*/
public void convertWaveToFlac(File inputFile, File outputFile) {
StreamConfiguration streamConfiguration = new StreamConfiguration();
streamConfiguration.setSampleRate(8000);
streamConfiguration.setBitsPerSample(16);
streamConfiguration.setChannelCount(1);
try {
AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(inputFile);
AudioFormat format = audioInputStream.getFormat();
int frameSize = format.getFrameSize();
FLACEncoder flacEncoder = new FLACEncoder();
FLACFileOutputStream flacOutputStream = new FLACFileOutputStream(outputFile);
flacEncoder.setStreamConfiguration(streamConfiguration);
flacEncoder.setOutputStream(flacOutputStream);
flacEncoder.openFLACStream();
int[] sampleData = new int[(int) audioInputStream.getFrameLength()];
byte[] samplesIn = new byte[frameSize];
int i = 0;
while (audioInputStream.read(samplesIn, 0, frameSize) != -1) {
if (frameSize != 1) {
ByteBuffer bb = ByteBuffer.wrap(samplesIn);
bb.order(ByteOrder.LITTLE_ENDIAN);
short shortVal = bb.getShort();
sampleData[i] = shortVal;
} else {
sampleData[i] = samplesIn[0];
}
i++;
}
flacEncoder.addSamples(sampleData, i);
flacEncoder.encodeSamples(i, false);
flacEncoder.encodeSamples(flacEncoder.samplesAvailableToEncode(), true);
audioInputStream.close();
flacOutputStream.close();
} catch (Exception ex) {
ex.printStackTrace();
}
}
/**
* Converts a wave file to a FLAC file(in order to POST the data to Google and retrieve a response) <br>
* Sample Rate is 8000 by default
*
* @param inputFile Input wave file
* @param outputFile Output FLAC file
*/
public void convertWaveToFlac(String inputFile, String outputFile) {
convertWaveToFlac(new File(inputFile), new File(outputFile));
}
}