test/jdk/javax/sound/midi/Gervill/SoftLowFrequencyOscillator/TestProcessControlLogic.java

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/* @test
 @summary Test SoftLowFrequencyOscillator processControlLogic method
 @modules java.desktop/com.sun.media.sound
*/

import com.sun.media.sound.AudioSynthesizerPropertyInfo;
import com.sun.media.sound.SoftLowFrequencyOscillator;
import com.sun.media.sound.SoftSynthesizer;

public class TestProcessControlLogic {

    private static float control_rate = 147f;
    private static SoftSynthesizer synth = new SoftSynthesizer();
    private static SoftLowFrequencyOscillator lfo = new SoftLowFrequencyOscillator();

    private static void testLFO(boolean shared, int instance, float freq, float delay,
            float delay2) throws Exception {
        SoftLowFrequencyOscillator lfo =
            shared?TestProcessControlLogic.lfo:new SoftLowFrequencyOscillator();
        lfo.reset();
        double[] lfo_freq = lfo.get(instance, "freq");
        double[] lfo_delay = lfo.get(instance, "delay");
        double[] lfo_delay2 = lfo.get(instance, "delay2");
        double[] lfo_output = lfo.get(instance, null);
        lfo_freq[0] = freq;
        lfo_delay[0] = delay;
        lfo_delay2[0] = delay2;
        lfo.init(synth);

        // For delayCount amount time, the output LFO should be 0.5
        int delayCount = (int) ((Math.pow(2, delay / 1200.0) * control_rate));
        delayCount += (int) ((delay2 * control_rate) / 1000.0);
        for (int i = 0; i < delayCount; i++) {
            if (Math.abs(0.5 - lfo_output[0]) > 0.000001)
                throw new Exception("Incorrect LFO output ("
                        +"0.5 != "+lfo_output[0]+")!");
            lfo.processControlLogic();
        }

        // After the delay the LFO should start oscillate
        // Let make sure output is accurate enough
        double p_step = (440.0 / control_rate)
        * Math.exp((freq - 6900.0) * (Math.log(2) / 1200.0));
        double p = 0;
        for (int i = 0; i < 30; i++) {
            p += p_step;
            double predicted_output = 0.5 + Math.sin(p * 2 * Math.PI) * 0.5;
            if (Math.abs(predicted_output - lfo_output[0]) > 0.001)
                throw new Exception("Incorrect LFO output ("
                        +predicted_output+" != "+lfo_output[0]+")!");
            lfo.processControlLogic();
        }

    }

    public static void main(String[] args) throws Exception {

        // Get default control rate from synthesizer
        AudioSynthesizerPropertyInfo[] p = synth.getPropertyInfo(null);
        for (int i = 0; i < p.length; i++) {
            if (p[i].name.equals("control rate")) {
                control_rate = ((Float) p[i].value).floatValue();
                break;
            }
        }

        // Test LFO under various configurations
        for (int instance = 0; instance < 3; instance++)
            for (int d1 = -3000; d1 < 0; d1 += 1000)
                for (int d2 = 0; d2 < 5000; d2 += 1000)
                    for (int fr = -1000; fr < 1000; fr += 100) {
                        testLFO(true, instance,
                                (fr == -1000) ? Float.NEGATIVE_INFINITY : fr,
                                (d1 == -3000) ? Float.NEGATIVE_INFINITY : d1,
                                d2);
                        testLFO(false, instance,
                                (fr == -1000) ? Float.NEGATIVE_INFINITY : fr,
                                (d1 == -3000) ? Float.NEGATIVE_INFINITY : d1,
                                d2);
                    }

    }
}