Method play

examples/src/Examples.hpp:178–233

struct ex_osc_pop : public labsound_example
{
    virtual void play(int argc, char** argv) override final
    {
        const auto defaultAudioDeviceConfigurations = GetDefaultAudioDeviceConfiguration();
        context = lab::MakeRealtimeAudioContext(defaultAudioDeviceConfigurations.second, defaultAudioDeviceConfigurations.first);
        lab::AudioContext& ac = *context.get();

        std::shared_ptr<OscillatorNode> oscillator;
        std::shared_ptr<RecorderNode> recorder;
        std::shared_ptr<GainNode> gain;
        {
            oscillator = std::make_shared<OscillatorNode>(ac);

            gain = std::make_shared<GainNode>(ac);
            gain->gain()->setValue(1);

            // osc -> destination
            context->connect(gain, oscillator, 0, 0);
            context->connect(context->device(), gain, 0, 0);

            oscillator->frequency()->setValue(1000.f);
            oscillator->setType(OscillatorType::SINE);

            recorder = std::make_shared<RecorderNode>(ac, defaultAudioDeviceConfigurations.second);
            context->addAutomaticPullNode(recorder);
            recorder->startRecording();
            context->connect(recorder, gain, 0, 0);
        }

        // retain nodes until demo end
        _nodes.push_back(oscillator);
        _nodes.push_back(recorder);
        _nodes.push_back(gain);

        // queue up 5 1/2 second chirps
        for (float i = 0; i < 5.f; i += 1.f)
        {
            oscillator->start(0);
            oscillator->stop(0.5f);
            Wait(1000);
        }

        recorder->stopRecording();
        context->removeAutomaticPullNode(recorder);
        recorder->writeRecordingToWav("ex_osc_pop.wav", false);

        // wait at least one context update to allow the disconnections to occur, and for any final
        // render quantum to finish.
        // @TODO the only safe and reasonable thing is to expose a "join" on the context that
        // disconnects the destination node from its graph, then waits a quantum.

        // @TODO the example app should have a set<shared_ptr<AudioNode>> so that the shared_ptrs
        // are not released until the example is finished.

        context->disconnect(context->device());
        Wait(100);
    }
};