Sound Demo 3
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<language>Java</language>
<code id="4b58377106264" hidden>
javax.sound.sampled.AudioFormat audioFormat;
javax.sound.sampled.AudioInputStream audioInputStream;
javax.sound.sampled.SourceDataLine sourceDataLine;
float sampleRate = 16000.0F;
int sampleSizeInBits = 16;
int channels = 1;
boolean signed = true;
boolean bigEndian = true;
audioData = new byte[16000*16];
void fillBuffer(double startat,double freq) {
java.nio.ByteBuffer byteBuffer;
java.nio.ShortBuffer shortBuffer;
int byteLength;
byteBuffer = java.nio.ByteBuffer.wrap(audioData);
shortBuffer = byteBuffer.asShortBuffer();
byteLength = audioData.length;
channels = 1;//Java allows 1 or 2
int bytesPerSamp = 2;
int sampLength = byteLength / bytesPerSamp;
for (int cnt = 0; cnt < sampLength; cnt++)
{
double time = cnt / sampleRate;
double sinValue = playFunction(startat/2+time,freq);
shortBuffer.put((short)(16000 * sinValue));
}
}
void draw(int dauer, double start,double freq){
dauer = dauer * 2;
canvas.clear();
double oldy = 100;
canvas.setColor(200,200,200);
canvas.line(0,100,600,100);
canvas.setColor(0,0,0);
for(int x=0; x< 600; x++) {
double newy = 100+100*playFunction(start/2+((double)dauer/2/600*x),freq);
if(start/2+(double)dauer/2/600*x == 0){
canvas.setColor(200,200,200);
canvas.line(x,0,x,200);
canvas.setColor(0,0,0);
}
canvas.line((x-1),(int)(oldy),x,(int)(newy));
oldy = newy;
}
}
void play(int dauer, double startat,double freq){
dauer = dauer * 2;
audioData = new byte[16000*dauer];
try{
fillBuffer(startat,freq);
InputStream byteArrayInputStream = new ByteArrayInputStream(audioData);
audioFormat = new javax.sound.sampled.AudioFormat(sampleRate, sampleSizeInBits, channels, signed, bigEndian);
audioInputStream = new javax.sound.sampled.AudioInputStream(byteArrayInputStream, audioFormat,
audioData.length / audioFormat.getFrameSize());
javax.sound.sampled.DataLine.Info dataLineInfo =
new javax.sound.sampled.DataLine.Info(javax.sound.sampled.SourceDataLine.class, audioFormat);
sourceDataLine = (javax.sound.sampled.SourceDataLine)javax.sound.sampled.AudioSystem.getLine(dataLineInfo);
sourceDataLine.open(audioFormat);
sourceDataLine.start();
playBuffer = new byte[16384];
int cnt;
while ((cnt = audioInputStream.read(playBuffer, 0,playBuffer.length))!= -1)
if (cnt > 0) sourceDataLine.write(playBuffer, 0, cnt);
sourceDataLine.drain();
sourceDataLine.stop();
sourceDataLine.close();
}
catch (Exception e){e.printStackTrace();System.exit(0);}
}
</code>
Mit diesem Beispiel kann man Funktionen hörbar machen. In diesem Beispiel werden 3 Sinuskurven zu einem Ton zusammengefügt. Gleichzeitig wird mit <tt>gain</tt> ein Abklingen des Tones simuliert.
<eval id="4b58377106a33">
// erzeugt eine Art Glockenschlag
double playFunction(double x, double freq){
double gain = 1.0-Math.log(x+1)/1.8;
if(gain < 0) gain = 0;
double sinValue =
(Math.sin(2*Math.PI*freq*x) +
Math.sin(2*Math.PI*(freq/1.8)*x) +
Math.sin(2*Math.PI*(freq/1.5)*x))/3.0;
return (sinValue)*gain;
}
draw(5,0,500.0); // 5 Sekunden diese Funktion spielen und mit x=0 beginnen
play(5,0,500.0); // Frequenz von 500 Herz
</eval>
<canvas></canvas>
<code id="4b595bb5960fe" hidden>
void fillToneBuffer(byte[] a, double startat,double freq) {
java.nio.ByteBuffer byteBuffer;
java.nio.ShortBuffer shortBuffer;
int byteLength;
byteBuffer = java.nio.ByteBuffer.wrap(a);
shortBuffer = byteBuffer.asShortBuffer();
byteLength = a.length;
channels = 1;//Java allows 1 or 2
int bytesPerSamp = 2;
int sampLength = byteLength / bytesPerSamp;
for (int cnt = 0; cnt < sampLength; cnt++)
{
double time = cnt / sampleRate;
double sinValue = ToneFunction(startat/2+time,freq);
shortBuffer.put((short)(16000 * sinValue));
}
}
Vector tones = new Vector();
void fillTones() {
tones = new Vector();
for(int i=0; i < 8; i++){
tempBuffer = new byte[16000*1]; // 0.5 sekunden
double f = 0;
if(i == 0) f = 264.0;
if(i == 1) f = 297.0;
if(i == 2) f = 330.0;
if(i == 3) f = 352.0;
if(i == 4) f = 396.0;
if(i == 5) f = 440.0;
if(i == 6) f = 495.0;
if(i == 7) f = 528.0;
fillToneBuffer(tempBuffer,0,f);
tones.add(tempBuffer);
}
}
void playTone(int t) {
try{
audioData = (byte[]) tones.get(t);
InputStream byteArrayInputStream = new ByteArrayInputStream(audioData);
audioFormat = new javax.sound.sampled.AudioFormat(sampleRate, sampleSizeInBits, channels, signed, bigEndian);
audioInputStream = new javax.sound.sampled.AudioInputStream(byteArrayInputStream, audioFormat,
audioData.length / audioFormat.getFrameSize());
javax.sound.sampled.DataLine.Info dataLineInfo =
new javax.sound.sampled.DataLine.Info(javax.sound.sampled.SourceDataLine.class, audioFormat);
sourceDataLine = (javax.sound.sampled.SourceDataLine)javax.sound.sampled.AudioSystem.getLine(dataLineInfo);
sourceDataLine.open(audioFormat);
sourceDataLine.start();
playBuffer = new byte[16384];
int cnt;
while ((cnt = audioInputStream.read(playBuffer, 0,playBuffer.length))!= -1)
if (cnt > 0) sourceDataLine.write(playBuffer, 0, cnt);
sourceDataLine.drain();
sourceDataLine.stop();
sourceDataLine.close();
}
catch (Exception e){e.printStackTrace();System.exit(0);}
}
void playTones(String s) {
s = s.toLowerCase();
for(int i=0; i < s.length(); i++){
if(s.charAt(i) == 'c') playTone(0);
if(s.charAt(i) == 'd') playTone(1);
if(s.charAt(i) == 'e') playTone(2);
if(s.charAt(i) == 'f') playTone(3);
if(s.charAt(i) == 'g') playTone(4);
if(s.charAt(i) == 'a') playTone(5);
if(s.charAt(i) == 'h') playTone(6);
}
}
</code>
In diesem Beispiel werden zunächst die Grundtöne C,D,E,F,G,A und H in einem Vector durch die Funktion <tt>fillTones()</tt> vor berechnet. Anschließend wird eine Tonfolge ausgegeben. Sie können diese Zeichenkette und die <tt>ToneFunction</tt> beliebig anpassen.
<eval id="4b595bb5968ce">
double ToneFunction(double x, double freq){
double gain = 1.0-Math.log(x+1)/0.6;
if(gain < 0) gain = 0;
double sinValue =
(Math.sin(2*Math.PI*freq*x) +
Math.sin(2*Math.PI*(freq/1.8)*x) +
Math.sin(2*Math.PI*(freq/1.5)*x))/3.0;
return (sinValue)*gain;
}
fillTones();
playTones("E E F G G F E D C C D E E D D"); // spielt eine Tonfolge ab.
</eval>