// @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; }