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Data update

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This commit is contained in:
Ingy döt Net 2025-06-11 20:16:52 -04:00
parent 72eb4943cb
commit 4d5544505c
2347 changed files with 62432 additions and 16731 deletions
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58
Task/Musical-scale/Java/musical-scale.java
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@ -1,4 +1,6 @@
import java.util.List;
import java.util.stream.IntStream;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.LineUnavailableException;
@ -7,48 +9,54 @@ import javax.sound.sampled.SourceDataLine;
public final class MusicalScale {
public static void main(String[] aArgs) {
List<Double> frequencies = List.of( 261.63, 293.66, 329.63, 349.23, 392.00, 440.00, 493.88, 523.25 );
final int duration = 500;
List<Double> frequencies = List.of( 261.63, 293.66, 329.63, 349.23, 392.00, 440.00, 493.88, 523.25 );
prepareSourceDataLine();
final int duration = 500; // in milliseconds
final int volume = 1;
for ( int i = 0; i < 3; i++ ) {
IntStream.range(0, 3).forEach( _ -> {
for ( double frequency : frequencies ) {
musicalTone(frequency, duration, volume);
}
}
} );
sourceDataLine.close();
}
private static void musicalTone(double aFrequency, int aDuration, int aVolume) {
byte[] buffer = new byte[1];
AudioFormat audioFormat = getAudioFormat();
private static void musicalTone(double frequency, int duration, int volume) {
sourceDataLine.start();
try ( SourceDataLine sourceDataLine = AudioSystem.getSourceDataLine(audioFormat) ) {
sourceDataLine.open(audioFormat);
sourceDataLine.start();
for ( int i = 0; i < aDuration * 8; i++ ) {
double angle = i / ( SAMPLE_RATE / aFrequency ) * 2 * Math.PI;
buffer[0] = (byte) ( Math.sin(angle) * 127 * aVolume );
sourceDataLine.write(buffer, BYTE_OFFSET, buffer.length);
}
sourceDataLine.drain();
sourceDataLine.stop();
sourceDataLine.close();
} catch (LineUnavailableException exception) {
exception.printStackTrace();
}
IntStream.range(0, 8 * duration).forEach( i -> {
final double angle = i / ( SAMPLE_RATE / frequency ) * 2 * Math.PI;
byte[] buffer = new byte[] { (byte) ( Math.sin(angle) * 127 * volume ) };
sourceDataLine.write(buffer, BYTE_OFFSET, buffer.length);
} );
sourceDataLine.drain();
sourceDataLine.stop();
}
private static AudioFormat getAudioFormat() {
private static void prepareSourceDataLine() {
final int sampleSizeInBits = 8;
final int numberChannels = 1;
final boolean signedData = true;
final boolean isBigEndian = false;
return new AudioFormat(SAMPLE_RATE, sampleSizeInBits, numberChannels, signedData, isBigEndian);
AudioFormat audioFormat = new AudioFormat(
SAMPLE_RATE, sampleSizeInBits, numberChannels, signedData, isBigEndian);
try {
sourceDataLine = AudioSystem.getSourceDataLine(audioFormat);
sourceDataLine.open(audioFormat);
} catch (LineUnavailableException lue) {
lue.printStackTrace();
}
}
private static SourceDataLine sourceDataLine;
private static float SAMPLE_RATE = 8_000.0F;
private static final int BYTE_OFFSET = 0;

68
Task/Musical-scale/JavaScript/musical-scale.js
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@ -1,36 +1,36 @@
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Sample Page</title>
<script>
function musicalScale(freqArr){
// create web audio api context
var AudioContext = window.AudioContext || window.webkitAudioContext;
var audioCtx = new AudioContext();
const SEMITONE = 2 ** (1 / 12)
// create oscillator and gain node
var oscillator = audioCtx.createOscillator();
var gainNode = audioCtx.createGain();
// connect oscillator to gain node to speakers
oscillator.connect(gainNode);
gainNode.connect(audioCtx.destination);
// set frequencies to play
duration = 0.5 // seconds
freqArr.forEach(function (freq, i){
oscillator.frequency.setValueAtTime(freq, audioCtx.currentTime + i * duration);
});
// start playing!
oscillator.start();
// stop playing!
oscillator.stop(audioCtx.currentTime + freqArr.length * duration);
function incrementSemitones(root) {
return (n) => root * SEMITONE ** n
}
</script>
</head>
<body>
<button onclick="musicalScale([261.63, 293.66, 329.63, 349.23, 392.00, 440.00, 493.88, 523.25]);">Play scale</button>
</body>
</html>
function playNotes(root, notes, { seconds, wave } = {}) {
const ctx = new AudioContext()
const oscillator = ctx.createOscillator()
const freqs = notes.map(incrementSemitones(root))
oscillator.connect(ctx.createGain().connect(ctx.destination))
oscillator.type = wave ?? 'sine'
const duration = seconds ?? 0.3
for (const [i, freq] of freqs.entries()) {
oscillator.frequency.setValueAtTime(freq, ctx.currentTime + i * duration)
}
oscillator.start()
oscillator.stop(ctx.currentTime + freqs.length * duration)
return new Promise((res) => oscillator.addEventListener('ended', res))
}
const A = 440
const C = incrementSemitones(A)(-9) // ~= 261.63
const major = [0, 2, 4, 5, 7, 9, 11, 12]
const minor = [0, 2, 3, 5, 7, 8, 10, 12]
void (async function main() {
await playNotes(C, major, { seconds: 0.3, wave: 'sine' })
await playNotes(A, minor, { seconds: 0.1, wave: 'triangle' })
})()