Java Audio : Playing PCM amplitude Array
转载自:http://ganeshtiwaridotcomdotnp.blogspot.com/2011/12/java-audio-playing-pcm-amplitude-array.html
How to play a array of PCM amplitude values (integer or float array) in Java - Steps
Basic Steps :
- //initialize source data line - for playback
- SourceDataLine line = AudioSystem.getSourceDataLine(audioFormat);
- line.open(audioFormat);
- line.start();
- //play the byteArray
- line.write(byteArray, 0, byteArray .length);//(byte[] b, int off, int len)
- line.drain();
- line.close();
Converting integer array to bytearray :
We need to convert our PCM array to byteArray because the line.write requires byte[] b as parameter.
- byte b = (byte)(i*127f);
Full code : This example plays the randomly generated array :
- public class PlayAnArray {
- private static int sampleRate = 16000;
- public static void main(String[] args) {
- try {
- final AudioFormat audioFormat = new AudioFormat(sampleRate, 8, 1, true, true);
- SourceDataLine line = AudioSystem.getSourceDataLine(audioFormat );
- line.open(audioFormat );
- line.start();
- for (int i = 0; i < 5; i++) {//repeat in loop
- play(line, generateRandomArray());
- }
- line.drain();
- line.close();
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- private static byte[] generateRandomArray() {
- int size = 20000;
- System.out.println(size);
- byte[] byteArray = new byte[size];
- for (int i = 0; i < size; i++) {
- byteArray[i] = (byte) (Math.random() * 127f);
- }
- return byteArray;
- }
- private static void play(SourceDataLine line, byte[] array) {
- int length = sampleRate * array.length / 1000;
- line.write(array, 0, array.length);
- }
- }
You may modify generateRandomArray to play different waveforms like SINE wave, square wave... etc
For playing a wave file in java follow my post on How to play wave file on java
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