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Implement highly experimental frequency detection

pull/35/head
James Ball 2021-05-22 18:42:30 +01:00
rodzic 943f275214
commit ce6616f398
8 zmienionych plików z 1037 dodań i 9 usunięć
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82
src/main/java/sh/ball/audio/AudioPlayer.java
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@ -14,6 +14,7 @@ import xt.audio.Structs.XtMix;
import xt.audio.Structs.XtStreamParams; import xt.audio.Structs.XtStreamParams;
import java.io.*; import java.io.*;
import java.util.ArrayList;
import java.util.HashMap; import java.util.HashMap;
import java.util.Map; import java.util.Map;
import java.util.concurrent.ArrayBlockingQueue; import java.util.concurrent.ArrayBlockingQueue;
@ -25,6 +26,8 @@ import sh.ball.shapes.Vector2;
import javax.sound.sampled.AudioFormat; import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream; import javax.sound.sampled.AudioInputStream;
import java.util.List; import java.util.List;
import java.util.concurrent.Semaphore;
import java.util.concurrent.locks.ReentrantLock;
public class AudioPlayer implements Renderer<List<Shape>, AudioInputStream> { public class AudioPlayer implements Renderer<List<Shape>, AudioInputStream> {
@ -37,6 +40,8 @@ public class AudioPlayer implements Renderer<List<Shape>, AudioInputStream> {
private final XtFormat format; private final XtFormat format;
private final BlockingQueue<List<Shape>> frameQueue = new ArrayBlockingQueue<>(BUFFER_SIZE); private final BlockingQueue<List<Shape>> frameQueue = new ArrayBlockingQueue<>(BUFFER_SIZE);
private final Map<Object, Effect> effects = new HashMap<>(); private final Map<Object, Effect> effects = new HashMap<>();
private final ReentrantLock lock = new ReentrantLock();
private final List<Listener> listeners = new ArrayList<>();
private ByteArrayOutputStream outputStream; private ByteArrayOutputStream outputStream;
private boolean recording = false; private boolean recording = false;
@ -58,6 +63,7 @@ public class AudioPlayer implements Renderer<List<Shape>, AudioInputStream> {
private int render(XtStream stream, XtBuffer buffer, Object user) throws InterruptedException { private int render(XtStream stream, XtBuffer buffer, Object user) throws InterruptedException {
XtSafeBuffer safe = XtSafeBuffer.get(stream); XtSafeBuffer safe = XtSafeBuffer.get(stream);
safe.lock(buffer); safe.lock(buffer);
lock.lock();
float[] output = (float[]) safe.getOutput(); float[] output = (float[]) safe.getOutput();
for (int f = 0; f < buffer.frames; f++) { for (int f = 0; f < buffer.frames; f++) {
@ -73,9 +79,7 @@ public class AudioPlayer implements Renderer<List<Shape>, AudioInputStream> {
output[f * format.channels.outputs] = leftChannel; output[f * format.channels.outputs] = leftChannel;
output[f * format.channels.outputs + 1] = rightChannel; output[f * format.channels.outputs + 1] = rightChannel;
if (recording) { writeChannels(leftChannel, rightChannel);
writeVector(leftChannel, rightChannel);
}
audioFramesDrawn++; audioFramesDrawn++;
@ -90,17 +94,33 @@ public class AudioPlayer implements Renderer<List<Shape>, AudioInputStream> {
} }
} }
safe.unlock(buffer); safe.unlock(buffer);
lock.unlock();
return 0; return 0;
} }
private void writeVector(float leftChannel, float rightChannel) { private void writeChannels(float leftChannel, float rightChannel) {
int left = (int)(leftChannel * Short.MAX_VALUE); int left = (int)(leftChannel * Short.MAX_VALUE);
int right = (int)(rightChannel * Short.MAX_VALUE); int right = (int)(rightChannel * Short.MAX_VALUE);
outputStream.write((byte) left); byte b0 = (byte) left;
outputStream.write((byte)(left >> 8)); byte b1 = (byte)(left >> 8);
outputStream.write((byte) right); byte b2 = (byte) right;
outputStream.write((byte)(right >> 8)); byte b3 = (byte)(right >> 8);
if (recording) {
outputStream.write(b0);
outputStream.write(b1);
outputStream.write(b2);
outputStream.write(b3);
}
for (Listener listener : listeners) {
listener.write(b0);
listener.write(b1);
listener.write(b2);
listener.write(b3);
listener.notifyIfFull();
}
framesRecorded++; framesRecorded++;
} }
@ -194,6 +214,24 @@ public class AudioPlayer implements Renderer<List<Shape>, AudioInputStream> {
effects.remove(identifier); effects.remove(identifier);
} }
@Override
public void read(byte[] buffer) throws InterruptedException {
Listener listener = new Listener(buffer);
try {
lock.lock();
listeners.add(listener);
} finally {
lock.unlock();
}
listener.waitUntilFull();
try {
lock.lock();
listeners.remove(listener);
} finally {
lock.unlock();
}
}
@Override @Override
public void startRecord() { public void startRecord() {
outputStream = new ByteArrayOutputStream(); outputStream = new ByteArrayOutputStream();
@ -211,4 +249,32 @@ public class AudioPlayer implements Renderer<List<Shape>, AudioInputStream> {
return new AudioInputStream(new ByteArrayInputStream(input), audioFormat, framesRecorded); return new AudioInputStream(new ByteArrayInputStream(input), audioFormat, framesRecorded);
} }
private static class Listener {
private final byte[] buffer;
private final Semaphore sema;
private int offset;
private Listener(byte[] buffer) {
this.buffer = buffer;
this.sema = new Semaphore(0);
}
private void waitUntilFull() throws InterruptedException {
sema.acquire();
}
private void notifyIfFull() {
if (offset >= buffer.length) {
sema.release();
}
}
private void write(byte b) {
if (offset < buffer.length) {
buffer[offset++] = b;
}
}
}
} }

105
src/main/java/sh/ball/audio/FrequencyAnalyser.java 100644
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@ -0,0 +1,105 @@
package sh.ball.audio;
import sh.ball.audio.fft.FFTFactory;
import sh.ball.audio.fft.Transform;
import java.util.ArrayList;
import java.util.List;
public class FrequencyAnalyser<S, T> implements Runnable {
private static final float NORMALIZATION_FACTOR_2_BYTES = Short.MAX_VALUE + 1.0f;
private final Renderer<S, T> renderer;
private final List<FrequencyListener> listeners = new ArrayList<>();
private final int frameSize;
private final int sampleRate;
public FrequencyAnalyser(Renderer<S, T> renderer, int frameSize, int sampleRate) {
this.renderer = renderer;
this.frameSize = frameSize;
this.sampleRate = sampleRate;
}
public void addListener(FrequencyListener listener) {
listeners.add(listener);
}
private void notifyListeners(double frequency) {
for (FrequencyListener listener : listeners) {
listener.updateFrequency(frequency);
}
}
// Adapted from https://stackoverflow.com/questions/53997426/java-how-to-get-current-frequency-of-audio-input
@Override
public void run() {
final byte[] buf = new byte[2 << 16]; // <--- increase this for higher frequency resolution
final int numberOfSamples = (buf.length / 2) / frameSize;
Transform fft = FFTFactory.getInstance().create(numberOfSamples);
int frequencyBin = sampleRate / (numberOfSamples / 2);
while (true) {
try {
renderer.read(buf);
} catch (InterruptedException e) {
e.printStackTrace();
}
// the stream represents each sample as two bytes -> decode
final float[] samples = decode(buf);
final float[][] transformed = fft.transform(samples);
final float[] realPart = transformed[0];
final float[] imaginaryPart = transformed[1];
final double[] magnitudes = toMagnitudes(realPart, imaginaryPart);
int maxIndex = 0;
double max = Double.NEGATIVE_INFINITY;
for (int i = 1; i < magnitudes.length / 2; i++) {
if (i * frequencyBin < 20 || i * frequencyBin > 20000) {
continue;
}
if (magnitudes[i] > max) {
maxIndex = i;
max = magnitudes[i];
}
}
System.out.println((maxIndex + 1) * frequencyBin * 1.05);
}
}
private float[] decode(final byte[] buf) {
final float[] fbuf = new float[(buf.length / 2) / frameSize];
int byteNum = 0;
int i = 0;
for (int pos = 0; pos < buf.length; pos += frameSize) {
if (byteNum < 2) {
int sample = byteToIntLittleEndian(buf, pos, frameSize);
// normalize to [0,1] (not strictly necessary, but makes things easier)
fbuf[i] = sample / NORMALIZATION_FACTOR_2_BYTES;
i++;
}
byteNum++;
byteNum %= 4;
}
return fbuf;
}
private double[] toMagnitudes(final float[] realPart, final float[] imaginaryPart) {
final double[] powers = new double[realPart.length / 2];
for (int i = 0; i < powers.length; i++) {
powers[i] = Math.sqrt(realPart[i] * realPart[i] + imaginaryPart[i] * imaginaryPart[i]);
}
return powers;
}
private static int byteToIntLittleEndian(final byte[] buf, final int offset, final int bytesPerSample) {
int sample = 0;
for (int byteIndex = 0; byteIndex < bytesPerSample; byteIndex++) {
final int aByte = buf[offset + byteIndex] & 0xff;
sample += aByte << 8 * (byteIndex);
}
return sample;
}
}

6
src/main/java/sh/ball/audio/FrequencyListener.java 100644
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@ -0,0 +1,6 @@
package sh.ball.audio;
public interface FrequencyListener {
void updateFrequency(double frequency);
}

2
src/main/java/sh/ball/audio/Renderer.java
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@ -14,6 +14,8 @@ public interface Renderer<S, T> extends Runnable {
void removeEffect(Object identifier); void removeEffect(Object identifier);
void read(byte[] buffer) throws InterruptedException;
void startRecord(); void startRecord();
T stopRecord(); T stopRecord();

279
src/main/java/sh/ball/audio/fft/FFTFactory.java 100644
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@ -0,0 +1,279 @@
/*
* =================================================
* Copyright 2011 tagtraum industries incorporated
* All rights reserved.
* =================================================
*/
// FROM: https://github.com/hendriks73/jipes/blob/master/src/main/java/com/tagtraum/jipes/math/FFTFactory.java
// LICENSE: https://github.com/hendriks73/jipes/blob/master/LICENSE.txt
// GNU LESSER GENERAL PUBLIC LICENSE Version 2.1, February 1999
package sh.ball.audio.fft;
/**
* <p>Factory for FFTransforms. Using the factory allows for sliding-in a faster, perhaps
* native implementation (like it's done in <a href="http://www.beatunes.com/">beaTunes</a>).
* </p>
* <p>In order to use a factory other than the default factory, you need to specify
* its classname with the system property <code>com.tagtraum.jipes.math.FFTFactory</code>.
* I.e.
* <xmp>-Dcom.tagtraum.jipes.math.FFTFactory=YOUR.CLASSNAME.HERE</xmp>
* <p>
*
* @author <a href="mailto:hs@tagtraum.com">Hendrik Schreiber</a>
*/
public abstract class FFTFactory {
public static final String FACTORYCLASS_PROPERTY_NAME = FFTFactory.class.getName();
private static FFTFactory instance;
protected FFTFactory() {
}
/**
* Creates a factory for FFT Transform objects.
*
* @return factory instance
*/
public synchronized static FFTFactory getInstance() {
if (instance == null) {
final String factoryClassname = System.getProperty(FACTORYCLASS_PROPERTY_NAME);
if (factoryClassname != null) {
try {
instance = (FFTFactory) Class.forName(factoryClassname, true, Thread.currentThread().getContextClassLoader()).newInstance();
} catch (Exception e) {
e.printStackTrace();
}
}
if (instance == null) {
// fall back to built-in factory
instance = new JavaFFTFactory();
}
}
return instance;
}
/**
* Creates an instance of the fast Fourier transform (FFT).
* By specifying the number of samples implementations can pre-create lookup tables to speed
* up the actual transform.
*
* @param numberOfSamples number of samples the FFT instance should be able to process
* @return FFT instance
*/
public abstract Transform create(int numberOfSamples);
/**
* Default implementation for a Java FFT factory.
*/
private static class JavaFFTFactory extends FFTFactory {
private JavaFFT last;
@Override
public synchronized Transform create(final int numberOfSamples) {
if (last != null && last.numberOfSamples == numberOfSamples) return last;
last = new JavaFFT(numberOfSamples);
return last;
}
}
/**
* Default implementation for a Java FFT.
*/
private static class JavaFFT implements Transform {
private static final int MAX_FAST_BITS = 16;
private static final int[][] FFT_BIT_TABLE = new int[MAX_FAST_BITS][];
private final int numberOfSamples;
private final int[] reverseIndices;
private float[] frequencies;
static {
int len = 2;
for (int b = 1; b <= MAX_FAST_BITS; b++) {
FFT_BIT_TABLE[b - 1] = new int[len];
for (int i = 0; i < len; i++) {
FFT_BIT_TABLE[b - 1][i] = reverseBits(i, b);
}
len <<= 1;
}
}
private JavaFFT(final int numberOfSamples) {
if (!isPowerOfTwo(numberOfSamples)) throw new IllegalArgumentException("N is not a power of 2");
if (numberOfSamples <=0) throw new IllegalArgumentException("N must be greater than 0");
this.numberOfSamples = numberOfSamples;
final int numberOfBits = getNumberOfNeededBits(numberOfSamples);
this.reverseIndices = new int[numberOfSamples];
for (int i = 0; i < numberOfSamples; i++) {
final int j = fastReverseBits(i, numberOfBits);
this.reverseIndices[i] = j;
}
this.frequencies = new float[numberOfSamples];
for (int index=0; index<numberOfSamples; index++) {
if (index <= numberOfSamples / 2) {
this.frequencies[index] = index / numberOfSamples;
} else {
this.frequencies[index] = -((numberOfSamples - index) / (float) numberOfSamples);
}
}
}
public float[][] inverseTransform(final float[] real, final float[] imaginary) throws UnsupportedOperationException {
final float[][] out = new float[2][real.length];
transform(true, real, imaginary, out[0], out[1]);
return out;
}
public float[][] transform(final float[] real) throws UnsupportedOperationException {
final float[][] out = new float[3][real.length];
transform(false, real, null, out[0], out[1]);
out[2] = frequencies.clone();
return out;
}
public float[][] transform(final float[] real, final float[] imaginary) throws UnsupportedOperationException {
final float[][] out = new float[3][real.length];
transform(false, real, imaginary, out[0], out[1]);
out[2] = frequencies.clone();
return out;
}
/**
* Actual fast Fourier transform implementation.
*
* @param inverse inverse or not
* @param realIn real portion input
* @param imaginaryIn imaginary in
* @param realOut real out
* @param imaginaryOut imaginary out
*/
public void transform(final boolean inverse,
final float[] realIn,
final float[] imaginaryIn,
final float[] realOut,
final float[] imaginaryOut) {
if (realIn.length != numberOfSamples) {
throw new IllegalArgumentException("Number of samples must be " + numberOfSamples + " for this instance of JavaFFT");
}
for (int i = 0; i < numberOfSamples; i++) {
realOut[this.reverseIndices[i]] = realIn[i];
}
if (imaginaryIn != null) {
for (int i = 0; i < numberOfSamples; i++) {
imaginaryOut[this.reverseIndices[i]] = imaginaryIn[i];
}
}
int blockEnd = 1;
final double angleNumerator;
if (inverse) angleNumerator = -2.0 * Math.PI;
else angleNumerator = 2.0 * Math.PI;
for (int blockSize = 2; blockSize <= numberOfSamples; blockSize <<= 1) {
final double deltaAngle = angleNumerator / (float) blockSize;
final double sm2 = (-Math.sin(-2 * deltaAngle));
final double sm1 = (-Math.sin(-deltaAngle));
final double cm2 = (Math.cos(-2 * deltaAngle));
final double cm1 = (Math.cos(-deltaAngle));
final double w = 2 * cm1;
double ar1;
double ai1;
double ar2;
double ai2;
for (int i = 0; i < numberOfSamples; i += blockSize) {
ar2 = cm2;
ar1 = cm1;
ai2 = sm2;
ai1 = sm1;
for (int j = i, n = 0; n < blockEnd; j++, n++) {
final double ar0 = w * ar1 - ar2;
ar2 = ar1;
ar1 = ar0;
final double ai0 = w * ai1 - ai2;
ai2 = ai1;
ai1 = ai0;
final int k = j + blockEnd;
/* temp real, temp imaginary */
final double tr = ar0 * realOut[k] - ai0 * imaginaryOut[k];
final double ti = ar0 * imaginaryOut[k] + ai0 * realOut[k];
realOut[k] = (float) (realOut[j] - tr);
imaginaryOut[k] = (float)(imaginaryOut[j] - ti);
realOut[j] += tr;
imaginaryOut[j] += ti;
}
}
blockEnd = blockSize;
}
// normalize, if inverse transform
if (inverse) {
for (int i = 0; i < numberOfSamples; i++) {
realOut[i] /= (float) numberOfSamples;
imaginaryOut[i] /= (float) numberOfSamples;
}
}
}
private static int getNumberOfNeededBits(final int powerOfTwo) {
for (int i = 0; true; i++) {
final int j = powerOfTwo & 1 << i;
if (j != 0) return i;
}
}
private static int reverseBits(final int index, final int numberOfBits) {
int ind = index;
int rev = 0;
for (int i = 0; i < numberOfBits; i++) {
rev = rev << 1 | ind & 1;
ind >>= 1;
}
return rev;
}
private static int fastReverseBits(final int index, final int numberOfBits) {
if (numberOfBits <= MAX_FAST_BITS)
return FFT_BIT_TABLE[numberOfBits - 1][index];
else
return reverseBits(index, numberOfBits);
}
private static boolean isPowerOfTwo(final int number) {
return (number & (number - 1)) == 0;
}
@Override
public boolean equals(final Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
final JavaFFT javaFFT = (JavaFFT) o;
if (numberOfSamples != javaFFT.numberOfSamples) return false;
return true;
}
@Override
public int hashCode() {
return numberOfSamples;
}
@Override
public String toString() {
return "JavaFFT{" +
"N=" + numberOfSamples +
'}';
}
}
}

502
src/main/java/sh/ball/audio/fft/LICENSE.txt 100644
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@ -0,0 +1,502 @@
GNU LESSER GENERAL PUBLIC LICENSE
Version 2.1, February 1999
Copyright (C) 1991, 1999 Free Software Foundation, Inc.
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies
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That's all there is to it!

60
src/main/java/sh/ball/audio/fft/Transform.java 100644
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@ -0,0 +1,60 @@
/*
* =================================================
* Copyright 2011 tagtraum industries incorporated
* All rights reserved.
* =================================================
*/
// FROM: https://github.com/hendriks73/jipes/blob/master/src/main/java/com/tagtraum/jipes/math/Transform.java
// LICENSE: https://github.com/hendriks73/jipes/blob/master/LICENSE.txt
// GNU LESSER GENERAL PUBLIC LICENSE Version 2.1, February 1999
package sh.ball.audio.fft;
/**
* Transform that can be obtained for example through a {@link FFTFactory}.
* <p/>
* The forward transform is typically from the time domain to the frequency domain,
* the inverse the other way around. Note that not all methods of this interface are necessarily implemented
* by its implementing classes. Unsupported methods throw {@link UnsupportedOperationException}s.
* <p/>
* Date: 1/15/11
* Time: 8:03 PM
*
* @author <a href="mailto:hs@tagtraum.com">Hendrik Schreiber</a>
*/
public interface Transform {
/**
* Performs transform on real values.
*
* @param real input array of real numbers
* @return array with the real and the imaginary part of the transform, the third float array contains
* the normalized frequencies, i.e. 1.0 is equal to the sample rate of the input
* @throws UnsupportedOperationException should the implementation not support this operation
*/
public float[][] transform(float[] real) throws UnsupportedOperationException;
/**
* Performs a complex transform.
*
* @param real input array of floats
* @param imaginary input array of floats
* @return array with the real and the imaginary part of the transform, the third float array contains
* the normalized frequencies, i.e. 1.0 is equal to the sample rate of the input
* @throws UnsupportedOperationException should the implementation not support this operation
*/
public float[][] transform(float[] real, float[] imaginary) throws UnsupportedOperationException;
/**
* Performs an inverse transform.
*
* @param real input array of floats
* @param imaginary input array of floats
* @return array with the real and the imaginary part of the transform
* @throws UnsupportedOperationException should the implementation not support this operation
*/
public float[][] inverseTransform(float[] real, float[] imaginary) throws UnsupportedOperationException;
}

10
src/main/java/sh/ball/gui/Controller.java
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@ -1,6 +1,8 @@
package sh.ball.gui; package sh.ball.gui;
import javafx.scene.control.*; import javafx.scene.control.*;
import sh.ball.audio.FrequencyAnalyser;
import sh.ball.audio.FrequencyListener;
import sh.ball.audio.Renderer; import sh.ball.audio.Renderer;
import sh.ball.audio.effect.Effect; import sh.ball.audio.effect.Effect;
import sh.ball.audio.effect.EffectType; import sh.ball.audio.effect.EffectType;
@ -42,7 +44,7 @@ import sh.ball.parser.ParserFactory;
import sh.ball.shapes.Shape; import sh.ball.shapes.Shape;
import sh.ball.shapes.Vector2; import sh.ball.shapes.Vector2;
public class Controller implements Initializable { public class Controller implements Initializable, FrequencyListener {
private static final int SAMPLE_RATE = 192000; private static final int SAMPLE_RATE = 192000;
private static final InputStream DEFAULT_OBJ = Controller.class.getResourceAsStream("/models/cube.obj"); private static final InputStream DEFAULT_OBJ = Controller.class.getResourceAsStream("/models/cube.obj");
@ -220,6 +222,7 @@ public class Controller implements Initializable {
executor.submit(producer); executor.submit(producer);
new Thread(renderer).start(); new Thread(renderer).start();
new Thread(new FrequencyAnalyser<>(renderer, 2, SAMPLE_RATE)).start();
} }
private void toggleRecord() { private void toggleRecord() {
@ -338,4 +341,9 @@ public class Controller implements Initializable {
protected void setObjRotate(Vector3 vector) { protected void setObjRotate(Vector3 vector) {
producer.setFrameSettings(ObjSettingsFactory.rotation(vector)); producer.setFrameSettings(ObjSettingsFactory.rotation(vector));
} }
@Override
public void updateFrequency(double frequency) {
}
} }