From ce6616f3986c828e97281d0d2783f320eb0b244f Mon Sep 17 00:00:00 2001 From: James Ball Date: Sat, 22 May 2021 18:42:30 +0100 Subject: [PATCH] Implement highly experimental frequency detection --- src/main/java/sh/ball/audio/AudioPlayer.java | 82 ++- .../java/sh/ball/audio/FrequencyAnalyser.java | 105 ++++ .../java/sh/ball/audio/FrequencyListener.java | 6 + src/main/java/sh/ball/audio/Renderer.java | 2 + .../java/sh/ball/audio/fft/FFTFactory.java | 279 ++++++++++ src/main/java/sh/ball/audio/fft/LICENSE.txt | 502 ++++++++++++++++++ .../java/sh/ball/audio/fft/Transform.java | 60 +++ src/main/java/sh/ball/gui/Controller.java | 10 +- 8 files changed, 1037 insertions(+), 9 deletions(-) create mode 100644 src/main/java/sh/ball/audio/FrequencyAnalyser.java create mode 100644 src/main/java/sh/ball/audio/FrequencyListener.java create mode 100644 src/main/java/sh/ball/audio/fft/FFTFactory.java create mode 100644 src/main/java/sh/ball/audio/fft/LICENSE.txt create mode 100644 src/main/java/sh/ball/audio/fft/Transform.java diff --git a/src/main/java/sh/ball/audio/AudioPlayer.java b/src/main/java/sh/ball/audio/AudioPlayer.java index c83af1b..6b51be6 100644 --- a/src/main/java/sh/ball/audio/AudioPlayer.java +++ b/src/main/java/sh/ball/audio/AudioPlayer.java @@ -14,6 +14,7 @@ import xt.audio.Structs.XtMix; import xt.audio.Structs.XtStreamParams; import java.io.*; +import java.util.ArrayList; import java.util.HashMap; import java.util.Map; import java.util.concurrent.ArrayBlockingQueue; @@ -25,6 +26,8 @@ import sh.ball.shapes.Vector2; import javax.sound.sampled.AudioFormat; import javax.sound.sampled.AudioInputStream; import java.util.List; +import java.util.concurrent.Semaphore; +import java.util.concurrent.locks.ReentrantLock; public class AudioPlayer implements Renderer, AudioInputStream> { @@ -37,6 +40,8 @@ public class AudioPlayer implements Renderer, AudioInputStream> { private final XtFormat format; private final BlockingQueue> frameQueue = new ArrayBlockingQueue<>(BUFFER_SIZE); private final Map effects = new HashMap<>(); + private final ReentrantLock lock = new ReentrantLock(); + private final List listeners = new ArrayList<>(); private ByteArrayOutputStream outputStream; private boolean recording = false; @@ -58,6 +63,7 @@ public class AudioPlayer implements Renderer, AudioInputStream> { private int render(XtStream stream, XtBuffer buffer, Object user) throws InterruptedException { XtSafeBuffer safe = XtSafeBuffer.get(stream); safe.lock(buffer); + lock.lock(); float[] output = (float[]) safe.getOutput(); for (int f = 0; f < buffer.frames; f++) { @@ -73,9 +79,7 @@ public class AudioPlayer implements Renderer, AudioInputStream> { output[f * format.channels.outputs] = leftChannel; output[f * format.channels.outputs + 1] = rightChannel; - if (recording) { - writeVector(leftChannel, rightChannel); - } + writeChannels(leftChannel, rightChannel); audioFramesDrawn++; @@ -90,17 +94,33 @@ public class AudioPlayer implements Renderer, AudioInputStream> { } } safe.unlock(buffer); + lock.unlock(); return 0; } - private void writeVector(float leftChannel, float rightChannel) { + private void writeChannels(float leftChannel, float rightChannel) { int left = (int)(leftChannel * Short.MAX_VALUE); int right = (int)(rightChannel * Short.MAX_VALUE); - outputStream.write((byte) left); - outputStream.write((byte)(left >> 8)); - outputStream.write((byte) right); - outputStream.write((byte)(right >> 8)); + byte b0 = (byte) left; + byte b1 = (byte)(left >> 8); + byte b2 = (byte) right; + 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++; } @@ -194,6 +214,24 @@ public class AudioPlayer implements Renderer, AudioInputStream> { 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 public void startRecord() { outputStream = new ByteArrayOutputStream(); @@ -211,4 +249,32 @@ public class AudioPlayer implements Renderer, AudioInputStream> { 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; + } + } + } } diff --git a/src/main/java/sh/ball/audio/FrequencyAnalyser.java b/src/main/java/sh/ball/audio/FrequencyAnalyser.java new file mode 100644 index 0000000..6681fb4 --- /dev/null +++ b/src/main/java/sh/ball/audio/FrequencyAnalyser.java @@ -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 implements Runnable { + + private static final float NORMALIZATION_FACTOR_2_BYTES = Short.MAX_VALUE + 1.0f; + + private final Renderer renderer; + private final List listeners = new ArrayList<>(); + private final int frameSize; + private final int sampleRate; + + public FrequencyAnalyser(Renderer 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; + } +} diff --git a/src/main/java/sh/ball/audio/FrequencyListener.java b/src/main/java/sh/ball/audio/FrequencyListener.java new file mode 100644 index 0000000..bf6519e --- /dev/null +++ b/src/main/java/sh/ball/audio/FrequencyListener.java @@ -0,0 +1,6 @@ +package sh.ball.audio; + +public interface FrequencyListener { + + void updateFrequency(double frequency); +} diff --git a/src/main/java/sh/ball/audio/Renderer.java b/src/main/java/sh/ball/audio/Renderer.java index 124eb73..669b95a 100644 --- a/src/main/java/sh/ball/audio/Renderer.java +++ b/src/main/java/sh/ball/audio/Renderer.java @@ -14,6 +14,8 @@ public interface Renderer extends Runnable { void removeEffect(Object identifier); + void read(byte[] buffer) throws InterruptedException; + void startRecord(); T stopRecord(); diff --git a/src/main/java/sh/ball/audio/fft/FFTFactory.java b/src/main/java/sh/ball/audio/fft/FFTFactory.java new file mode 100644 index 0000000..f7d271c --- /dev/null +++ b/src/main/java/sh/ball/audio/fft/FFTFactory.java @@ -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; + +/** + *

Factory for FFTransforms. Using the factory allows for sliding-in a faster, perhaps + * native implementation (like it's done in beaTunes). + *

+ *

In order to use a factory other than the default factory, you need to specify + * its classname with the system property com.tagtraum.jipes.math.FFTFactory. + * I.e. + *

-Dcom.tagtraum.jipes.math.FFTFactory=YOUR.CLASSNAME.HERE + *

+ * + * @author Hendrik Schreiber + */ +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>= 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 + + '}'; + } + } + + +} diff --git a/src/main/java/sh/ball/audio/fft/LICENSE.txt b/src/main/java/sh/ball/audio/fft/LICENSE.txt new file mode 100644 index 0000000..f166cc5 --- /dev/null +++ b/src/main/java/sh/ball/audio/fft/LICENSE.txt @@ -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 + of this license document, but changing it is not allowed. + +[This is the first released version of the Lesser GPL. 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See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + +Also add information on how to contact you by electronic and paper mail. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the library, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the + library `Frob' (a library for tweaking knobs) written by James Random Hacker. + + , 1 April 1990 + Ty Coon, President of Vice + +That's all there is to it! \ No newline at end of file diff --git a/src/main/java/sh/ball/audio/fft/Transform.java b/src/main/java/sh/ball/audio/fft/Transform.java new file mode 100644 index 0000000..e5b5ba4 --- /dev/null +++ b/src/main/java/sh/ball/audio/fft/Transform.java @@ -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}. + *

+ * 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. + *

+ * Date: 1/15/11 + * Time: 8:03 PM + * + * @author Hendrik Schreiber + */ +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; + +} \ No newline at end of file diff --git a/src/main/java/sh/ball/gui/Controller.java b/src/main/java/sh/ball/gui/Controller.java index c145d3c..797d9b6 100644 --- a/src/main/java/sh/ball/gui/Controller.java +++ b/src/main/java/sh/ball/gui/Controller.java @@ -1,6 +1,8 @@ package sh.ball.gui; import javafx.scene.control.*; +import sh.ball.audio.FrequencyAnalyser; +import sh.ball.audio.FrequencyListener; import sh.ball.audio.Renderer; import sh.ball.audio.effect.Effect; import sh.ball.audio.effect.EffectType; @@ -42,7 +44,7 @@ import sh.ball.parser.ParserFactory; import sh.ball.shapes.Shape; 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 InputStream DEFAULT_OBJ = Controller.class.getResourceAsStream("/models/cube.obj"); @@ -220,6 +222,7 @@ public class Controller implements Initializable { executor.submit(producer); new Thread(renderer).start(); + new Thread(new FrequencyAnalyser<>(renderer, 2, SAMPLE_RATE)).start(); } private void toggleRecord() { @@ -338,4 +341,9 @@ public class Controller implements Initializable { protected void setObjRotate(Vector3 vector) { producer.setFrameSettings(ObjSettingsFactory.rotation(vector)); } + + @Override + public void updateFrequency(double frequency) { + + } }