I try to create a continuous sound (440Hz) with the setLoopPoints method.
It tryed several examples i found on fora and google but i don't get it
working.
The return value of track.setLoopPoints(0,sound.length/4, -1) is 0, and
thats ok.
Can someone tell me what i am doing wrong?
Here is my code:
int sr = 48000;
int numOfSamples = sr;
double sample[] = new double[numOfSamples];
byte sound[] = new byte[2 * numOfSamples];
// fill out the array
for (int i = 0; i < numOfSamples; ++i) {
sample[i] = Math.sin(2 * Math.PI * i / (sr / 440));
}
int i = 0;
for (double dVal : sample) {
// scale to maximum amplitude
final short val = (short) ((dVal * 32767));
// in 16 bit wav PCM, first byte is the low order byte
sound[i++] = (byte) (val & 0x00ff);
sound[i++] = (byte) ((val & 0xff00) >>> 8);
}
// Obtain a minimum buffer size
int minBuffer = AudioTrack.getMinBufferSize(sr,
AudioFormat.CHANNEL_OUT_MONO,
AudioFormat.ENCODING_PCM_16BIT);
// Create an AudioTrack
AudioTrack track = new AudioTrack(
AudioManager.STREAM_MUSIC,
sr,
AudioFormat.CHANNEL_OUT_STEREO,
AudioFormat.ENCODING_PCM_16BIT,
sound.length,
AudioTrack.MODE_STATIC);
// Write audio data to track
track.write(sound, 0, sound.length);
int a = track.setLoopPoints(0,sound.length/4, -1);
// Begin playing track
track.play();
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