Musical scale: Difference between revisions
→{{header|Java}}
Line 898:
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import java.util.List;
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import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;
/**
* Java can play sounds without external libraries.
*/
public class MusicalScale {
public static void main(String[] args) throws LineUnavailableException {
List<Integer> frequencies = List.of( 262, 294, 330, 349, 392, 440, 494, 523 ); // CDEFGABC
final int duration = 500;
final int volume = 1;
for ( int i = 0; i < 3; i++ ) {
for ( int frequency : frequencies ) {
musicalTone(frequency, duration, volume);
}
}
}
private static void musicalTone(int aFrequency, int aDuration, int aVolume) throws LineUnavailableException {
byte[] buffer = new byte[1];
AudioFormat audioFormat = getAudioFormat();
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();
}
private static AudioFormat getAudioFormat() {
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);
}
private static float SAMPLE_RATE = 8_000.0F;
private static final int BYTE_OFFSET = 0;
}
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=={{header|JavaScript}}==
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