Method play

examples/src/Examples.hpp:400–494

struct ex_frequency_modulation : public labsound_example
{
    virtual void play(int argc, char ** argv) override
    {
        UniformRandomGenerator fmrng;

        const auto defaultAudioDeviceConfigurations = GetDefaultAudioDeviceConfiguration();
        context = lab::MakeRealtimeAudioContext(defaultAudioDeviceConfigurations.second, defaultAudioDeviceConfigurations.first);
        lab::AudioContext& ac = *context.get();

        std::shared_ptr<OscillatorNode> modulator;
        std::shared_ptr<GainNode> modulatorGain;
        std::shared_ptr<OscillatorNode> osc;
        std::shared_ptr<ADSRNode> trigger;

        std::shared_ptr<GainNode> signalGain;
        std::shared_ptr<GainNode> feedbackTap;
        std::shared_ptr<DelayNode> chainDelay;

        {
            modulator = std::make_shared<OscillatorNode>(ac);
            modulator->setType(OscillatorType::TRIANGLE);
            modulator->start(0);

            modulatorGain = std::make_shared<GainNode>(ac);

            osc = std::make_shared<OscillatorNode>(ac);
            osc->setType(OscillatorType::SINE);
            osc->frequency()->setValue(300);
            osc->start(0);

            trigger = std::make_shared<ADSRNode>(ac);
            trigger->oneShot()->setBool(true);

            signalGain = std::make_shared<GainNode>(ac);
            signalGain->gain()->setValue(1.0f);

            feedbackTap = std::make_shared<GainNode>(ac);
            feedbackTap->gain()->setValue(0.5f);

            chainDelay = std::make_shared<DelayNode>(ac, 4);
            chainDelay->delayTime()->setFloat(0.0f);  // passthrough delay, not sure if this has the same DSP semantic as ChucK

            // device
            //   signalGain <- chainDelay <- feedbackTap <- signalGain <- trigger <- osc
            //   osc->freq <- modulatorGain <- modulator
                        
            // Set up FM processing chain:
            context->connect(modulatorGain, modulator, 0, 0);  // Modulator to Gain
            context->connectParam(osc->frequency(), modulatorGain, 0);  // Gain to frequency parameter

#if 1
            // with adsr
            context->connect(trigger, osc, 0, 0);  // Osc to ADSR
            context->connect(signalGain, trigger, 0, 0);  // ADSR to signalGain
#else
            // sans adsr
            context->connect(signalGain, osc, 0, 0);  // Osc to ADSR
#endif