Java AudioInputStream.skip方法代碼示例

import javax.sound.sampled.AudioInputStream; //導入方法依賴的package包/類
public static void main(String[] args) throws Exception {
    AudioFloatFormatConverter converter = new AudioFloatFormatConverter();
    byte[] data = { 10, 20, 30, 40, 30, 20, 10 };
    AudioFormat format = new AudioFormat(8000, 8, 1, true, false);
    AudioFormat format2 = new AudioFormat(16000, 8, 1, true, false);
    AudioInputStream ais = new AudioInputStream(new ByteArrayInputStream(
            data), format, data.length);
    AudioInputStream ais2 = converter.getAudioInputStream(format2, ais);
    byte[] data2 = new byte[30];
    int ret = ais2.read(data2, 0, data2.length);
    ais.reset();
    AudioInputStream ais3 = converter.getAudioInputStream(format2, ais);
    byte[] data3 = new byte[100];
    ais3.skip(7);
    int ret2 = ais3.read(data3, 7, data3.length);
    if (ret2 != ret - 7)
        throw new Exception("Skip doesn't work correctly (" + ret2 + " != "
                + (ret - 7) + ")");
    for (int i = 7; i < ret2 + 7; i++) {
        if (data3[i] != data2[i])
            throw new Exception("Skip doesn't work correctly (" + data3[i]
                    + " != " + data2[i] + ")");
    }
}
 

import javax.sound.sampled.AudioInputStream; //導入方法依賴的package包/類
public static void main(String[] args) throws Exception
{
    AudioSynthesizer synth = new SoftSynthesizer();
    AudioFormat format = new AudioFormat(44100, 16, 2, true, false);
    AudioInputStream stream = synth.openStream(format, null);

    // Make all voices busy, e.g.
    // send midi on and midi off on all available voices
    MidiChannel ch1 = synth.getChannels()[0];
    ch1.programChange(48); // Use contionus instrument like string ensemble
    for (int i = 0; i < synth.getMaxPolyphony(); i++) {
        ch1.noteOn(64, 64);
        ch1.noteOff(64);
    }

    // Now send single midi on, and midi off message
    ch1.noteOn(64, 64);
    ch1.noteOff(64);

    // Read 10 sec from stream, by this time all voices should be inactvie
    stream.skip(format.getFrameSize() * ((int)(format.getFrameRate() * 20)));

    // If no voice are active, then this test will pass
    VoiceStatus[] v = synth.getVoiceStatus();
    for (int i = 0; i < v.length; i++) {
        if(v[i].active)
        {
            throw new RuntimeException("Not all voices are inactive!");
        }
    }

    // Close the synthesizer after use
    synth.close();
}
 

import javax.sound.sampled.AudioInputStream; //導入方法依賴的package包/類
public static void main(String[] args) throws Exception
{
    // Create instance of the synthesizer with very low polyphony
    AudioSynthesizer synth = new SoftSynthesizer();
    AudioFormat format = new AudioFormat(44100, 16, 2, true, false);
    Map<String, Object> p = new HashMap<String, Object>();
    p.put("max polyphony", new Integer(5));
    AudioInputStream stream = synth.openStream(format, p);

    // Create instrument with too many regions (more than max polyphony)
    SF2Soundbank sf2 = new SF2Soundbank();

    SF2Sample sample = new SF2Sample(sf2);
    sample.setName("test sample");
    sample.setData(new byte[100]);
    sample.setSampleRate(44100);
    sample.setOriginalPitch(20);
    sf2.addResource(sample);

    SF2Layer layer = new SF2Layer(sf2);
    layer.setName("test layer");
    sf2.addResource(layer);

    for (int i = 0; i < 100; i++) {
        SF2LayerRegion region = new SF2LayerRegion();
        region.setSample(sample);
        layer.getRegions().add(region);
    }

    SF2Instrument ins = new SF2Instrument(sf2);
    ins.setPatch(new Patch(0,0));
    ins.setName("test instrument");
    sf2.addInstrument(ins);

    SF2InstrumentRegion insregion = new SF2InstrumentRegion();
    insregion.setLayer(layer);
    ins.getRegions().add(insregion);

    // Load the test soundbank into the synthesizer
    synth.unloadAllInstruments(synth.getDefaultSoundbank());
    synth.loadAllInstruments(sf2);

    // Send out one midi on message
    MidiChannel ch1 = synth.getChannels()[0];
    ch1.programChange(0);
    ch1.noteOn(64, 64);

    // Read 1 sec from stream
    stream.skip(format.getFrameSize() * ((int)(format.getFrameRate() * 2)));

    // Close the synthesizer after use
    synth.close();
}