/*
* _______ _____ _____ _____
* |__ __| | __ \ / ____| __ \
* | | __ _ _ __ ___ ___ ___| | | | (___ | |__) |
* | |/ _` | '__/ __|/ _ \/ __| | | |\___ \| ___/
* | | (_| | | \__ \ (_) \__ \ |__| |____) | |
* |_|\__,_|_| |___/\___/|___/_____/|_____/|_|
*
* -------------------------------------------------------------
*
* TarsosDSP is developed by Joren Six at IPEM, University Ghent
*
* -------------------------------------------------------------
*
* Info: http://0110.be/tag/TarsosDSP
* Github: https://github.com/JorenSix/TarsosDSP
* Releases: http://0110.be/releases/TarsosDSP/
*
* TarsosDSP includes modified source code by various authors,
* for credits and info, see README.
*
*/
package be.tarsos.dsp.test;
import static org.junit.Assert.assertEquals;
import java.io.ByteArrayInputStream;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;
import org.junit.Test;
import be.tarsos.dsp.AudioDispatcher;
import be.tarsos.dsp.io.TarsosDSPAudioFloatConverter;
import be.tarsos.dsp.io.TarsosDSPAudioFormat;
import be.tarsos.dsp.io.jvm.JVMAudioInputStream;
import be.tarsos.dsp.pitch.DTMF;
import be.tarsos.dsp.pitch.Goertzel;
import be.tarsos.dsp.pitch.Goertzel.FrequenciesDetectedHandler;
public class GoertzelTest {
/**
* Generate a buffer with one sine wave.
*
* @param f0
* the frequency of the sine wave;
* @param size
* the size of the buffer in samples.
* @return a buffer (float array) with audio information for the sine wave.
*/
public static float[] testAudioBufferSine(final double f0, int size) {
final double sampleRate = 44100.0;
final double amplitudeF0 = 1.0;
final float[] buffer = new float[size];
for (int sample = 0; sample < buffer.length; sample++) {
final double time = sample / sampleRate;
buffer[sample] = (float) (amplitudeF0 * Math.sin(2 * Math.PI * f0
* time));
}
return buffer;
}
/**
* Append float buffers to form one big float buffer.
*
* @param floatBuffers
* The float buffers to append.
* @return An appended float buffer with all the information in the array of
* buffers.
*/
public static float[] appendBuffers(final float[]...floatBuffers){
int size = 0;
for(int i = 0 ; i < floatBuffers.length ; i ++){
size += floatBuffers[i].length;
}
final float[] floatBuffer = new float[size];
int index = 0;
for(int i = 0 ; i < floatBuffers.length; i ++){
for(int j = 0 ; j < floatBuffers[i].length ; j++){
floatBuffer[index] = floatBuffers[i][j];
index++;
}
}
return floatBuffer;
}
/**
* Test detection of a simple sine wave (one frequency).
* @throws LineUnavailableException
* @throws UnsupportedAudioFileException
*/
@Test
public void testDetection() throws LineUnavailableException, UnsupportedAudioFileException{
final float[][] floatSinBuffers = {testAudioBufferSine(6000,10240),testAudioBufferSine(2000,10240),testAudioBufferSine(4000,10240)};
final float[] floatBuffer = appendBuffers(floatSinBuffers);
final TarsosDSPAudioFormat format = new TarsosDSPAudioFormat(44100, 16, 1, true, false);
final TarsosDSPAudioFloatConverter converter = TarsosDSPAudioFloatConverter.getConverter(format);
final byte[] byteBuffer = new byte[floatBuffer.length * format.getFrameSize()];
assertEquals("Specified 16 bits so framesize should be 2.", 2, format.getFrameSize());
converter.toByteArray(floatBuffer, byteBuffer);
final ByteArrayInputStream bais = new ByteArrayInputStream(byteBuffer);
final AudioInputStream inputStream = new AudioInputStream(bais, JVMAudioInputStream.toAudioFormat(format),floatBuffer.length);
JVMAudioInputStream stream = new JVMAudioInputStream(inputStream);
final AudioDispatcher dispatcher = new AudioDispatcher(stream, 1024, 0);
double[] frequencies = {6000,3000,5000,5800,6500};
dispatcher.addAudioProcessor(new Goertzel(44100,1024,frequencies,new FrequenciesDetectedHandler() {
@Override
public void handleDetectedFrequencies(double time,final double[] frequencies, final double[] powers, final double[] allFrequencies, final double allPowers[]) {
assertEquals("Should only detect 6000 Hz",(int)frequencies[0],6000);
}
}));
//dispatcher.addAudioProcessor(new BlockingAudioPlayer(format,1024, 0));
dispatcher.run();
}
/**
* Test detection of multiple frequencies.
* @throws LineUnavailableException
* @throws UnsupportedAudioFileException
*/
@Test
public void testDTMF() throws LineUnavailableException, UnsupportedAudioFileException{
final float[][] floatSinBuffers = {DTMF.generateDTMFTone('1'),DTMF.generateDTMFTone('2'),DTMF.generateDTMFTone('3'),DTMF.generateDTMFTone('4'),DTMF.generateDTMFTone('5'),DTMF.generateDTMFTone('6'),DTMF.generateDTMFTone('7'),DTMF.generateDTMFTone('8'),DTMF.generateDTMFTone('9')};
final float[] floatBuffer = appendBuffers(floatSinBuffers);
final int stepSize = 512;
final AudioFormat format = new AudioFormat(44100, 16, 1, true, false);
final TarsosDSPAudioFloatConverter converter = TarsosDSPAudioFloatConverter.getConverter(JVMAudioInputStream.toTarsosDSPFormat(format));
final byte[] byteBuffer = new byte[floatBuffer.length * format.getFrameSize()];
assertEquals("Specified 16 bits so framesize should be 2.", 2, format.getFrameSize());
converter.toByteArray(floatBuffer, byteBuffer);
final ByteArrayInputStream bais = new ByteArrayInputStream(byteBuffer);
final AudioInputStream inputStream = new AudioInputStream(bais, format,floatBuffer.length);
JVMAudioInputStream stream = new JVMAudioInputStream(inputStream);
final AudioDispatcher dispatcher = new AudioDispatcher(stream, stepSize, 0);
final StringBuilder data = new StringBuilder();
dispatcher.addAudioProcessor(new Goertzel(44100, stepSize,
DTMF.DTMF_FREQUENCIES, new FrequenciesDetectedHandler() {
@Override
public void handleDetectedFrequencies(double time,
final double[] frequencies, final double[] powers, final double[] allFrequencies, final double allPowers[]) {
// assertEquals("Should detect 2 frequencies.",2,frequencies.length);
assertEquals(
"Number of frequencies should be the same as the number of powers.",
frequencies.length, powers.length);
if (frequencies.length == 2) {
int rowIndex = -1;
int colIndex = -1;
for (int i = 0; i < 4; i++) {
if (frequencies[0] == DTMF.DTMF_FREQUENCIES[i] || frequencies[1] == DTMF.DTMF_FREQUENCIES[i])
rowIndex = i;
}
for (int i = 4; i < DTMF.DTMF_FREQUENCIES.length; i++) {
if (frequencies[0] == DTMF.DTMF_FREQUENCIES[i] || frequencies[1] == DTMF.DTMF_FREQUENCIES[i])
colIndex = i-4;
}
if(rowIndex>=0 && colIndex>=0){
char character = DTMF.DTMF_CHARACTERS[rowIndex][colIndex];
if(data.length()==0 || character != data.charAt(data.length()-1)){
data.append(character);
}
}
}
}
}));
//dispatcher.addAudioProcessor(new BlockingAudioPlayer(format, stepSize, 0));
dispatcher.run();
assertEquals("Decoded string should be 123456789", "123456789", data.toString());
assertEquals("Length should be 9", 9, data.length());
}
}