// @Test
public void playTest() throws Exception {
logger.info("start playTest");
SourceDataLine audioLine = null;
MediaAudio samples = beepSamples();
logger.info("sample is ready");
AudioFormat format =
new AudioFormat(
(float) samples.getSampleRate(),
(int) samples.getBytesPerSample() * 8,
samples.getChannels(),
true,
false);
DataLine.Info info = new DataLine.Info(SourceDataLine.class, format);
audioLine = (SourceDataLine) AudioSystem.getLine(info);
audioLine.open(format);
logger.info("beepstart");
audioLine.start();
Buffer buffer = samples.getData(0);
audioLine.write(
buffer.getByteArray(0, samples.getDataPlaneSize(0)), 0, samples.getDataPlaneSize(0));
audioLine.drain();
logger.info("beepend");
audioLine.close();
audioLine = null;
}
/**
* make sine wave humble MediaAudio.
*
* @return
*/
private MediaAudio beepSamples() {
int sampleRate = 44100; // 44.1KHz
int sampleNum = 44100; // 44100 samples(1sec)
int channel = 2; // 2channel(stereo)
int tone = 440; // 440Hz tone.
int bit = 16; // 16bit
ByteBuffer buffer = ByteBuffer.allocate((int) sampleNum * bit * channel / 8);
double rad = tone * 2 * Math.PI / sampleRate; // radian for each sample.
double max = (1 << (bit - 2)) - 1; // ampletude
buffer.order(ByteOrder.LITTLE_ENDIAN);
for (int i = 0; i < sampleNum; i++) {
short data = (short) (Math.sin(rad * i) * max);
for (int j = 0; j < channel; j++) {
buffer.putShort(data);
}
}
buffer.flip();
logger.info("data size for 1sec buffer.:" + buffer.remaining());
MediaAudio samples =
MediaAudio.make(
sampleNum, sampleRate, channel, Layout.CH_LAYOUT_STEREO, Type.SAMPLE_FMT_S16);
samples.getData(0).put(buffer.array(), 0, 0, buffer.remaining());
logger.info(
"{}",
samples.getDataPlaneSize(0)); // why this size is little bit bigger than original buffer?
samples.setComplete(true);
samples.setTimeBase(Rational.make(1, 44100));
samples.setTimeStamp(0);
samples.setNumSamples(sampleNum);
return samples;
}
