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Author |
Topic: writing .WAV files (Read 2496 times) |
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Dimitre
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writing .WAV files
« on: Sep 18th, 2003, 9:31pm » |
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program to genereate wave files
only runs inside proce55ing
Code:// wave generator
//
// this sketch generates a file called "tuu.wav" in
// proce55ing root directory.
// experiment values in variables altura and altura2
// to get tune variations
// try opening generated file in your favorite sound editor :)
//
// 17/07/2003
// bona (www.papamuerta.com) & dimitre
byte[] valor = new byte[200+88200];
// 88200 = 44100 samples/sec * 2 channels = 1 second of wave
int index;
float amplitude;
double sample, sample2;
float altura, altura2, divisor, divisor2;
void setup() {
System.arraycopy(waveHeader, 0, valor, 0, waveHeader.length);
// volume do som, vai de 0 a 127
amplitude = 100;
// frequencia em HZ, 440 é a nota Lá
altura = 240f;
altura2 = 1360f;
for (index=0; index<88200; index++) {
divisor = 88200/altura;
divisor2 = 88200/altura2;
// onda normal
// sample = (sin(2*PI*index/divisor) * amplitude);
// onda composta
sample = ((sin(2*PI*index/divisor) * amplitude) + (sin(2*PI*index/divisor2) * amplitude)) / 2;
//tremolo
//amplitude = (sin(index/1000f) * 127);
if (sample < 0) sample = 255 - (sample * -1) ;
valor[waveHeader.length+index] = byte(sample);
}
geraWave();
}
void geraWave(){
//File file = null;
//file = new File("tuu.wav");
try {
java.io.FileOutputStream fileoutputstream = new FileOutputStream("tuu.wav");
fileoutputstream.write(valor);
fileoutputstream.flush();
fileoutputstream.close();
}
catch(IOException ioexception){
ioexception.printStackTrace();
}
}
static byte waveHeader[] = {
(byte)0x52, (byte)0x49, (byte)0x46, (byte)0x46, (byte)0x8a, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x57,
(byte)0x41, (byte)0x56, (byte)0x45, (byte)0x66, (byte)0x6d, (byte)0x74, (byte)0x20, (byte)0x10, (byte)0x00,
(byte)0x00, (byte)0x00, (byte)0x01, (byte)0x00, (byte)0x01, (byte)0x00, (byte)0x44, (byte)0xac, (byte)0x00,
(byte)0x00, (byte)0x88, (byte)0x58, (byte)0x01, (byte)0x00, (byte)0x02, (byte)0x00, (byte)0x10, (byte)0x00,
(byte)0x64, (byte)0x61, (byte)0x74, (byte)0x61, (byte)0x8A, (byte)0x58, (byte)0x01, (byte)0x00
}; |
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| « Last Edit: Sep 18th, 2003, 9:33pm by Dimitre » |
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