Method play

examples/src/Examples.hpp:783–837

struct ex_hrtf_spatialization : public labsound_example
{
    virtual void play(int argc, char ** argv) override
    {
        const auto defaultAudioDeviceConfigurations = GetDefaultAudioDeviceConfiguration();
        context = lab::MakeRealtimeAudioContext(defaultAudioDeviceConfigurations.second, defaultAudioDeviceConfigurations.first);
        lab::AudioContext& ac = *context.get();
        
        if (!ac.loadHrtfDatabase("hrtf")) {
            std::string path = std::string(SAMPLE_SRC_DIR) + "/hrtf";
            if (!ac.loadHrtfDatabase(path)) {
                printf("Could not load spatialization database");
                return;
            }
        }

        std::shared_ptr<AudioBus> audioClip = MakeBusFromSampleFile("samples/trainrolling.wav", argc, argv);
        std::shared_ptr<SampledAudioNode> audioClipNode = std::make_shared<SampledAudioNode>(ac);
        if (audioClipNode)
        {
            std::shared_ptr<PannerNode> panner = std::make_shared<PannerNode>(ac);
            _nodes.push_back(audioClipNode);
            _nodes.push_back(panner);


            panner->setPanningModel(PanningModel::HRTF);
            {
                ContextRenderLock r(context.get(), "ex_hrtf_spatialization");
                audioClipNode->setBus(r, audioClip);
            }
            audioClipNode->schedule(0.0, -1);  // -1 to loop forever
            context->connect(panner, audioClipNode, 0, 0);
            context->connect(context->device(), panner, 0, 0);

            context->listener()->setPosition({0, 0, 0});
            panner->setVelocity(4, 0, 0);

            context->synchronizeConnections();
            //context->debugTraverse(context->device().get());

            const int seconds = 10;
            float halfTime = seconds * 0.5f;
            for (float i = 0; i < seconds; i += 0.01f)
            {
                float x = (i - halfTime) / halfTime;

                // Put position a +up && +front, because if it goes right through the
                // listener at (0, 0, 0) it abruptly switches from left to right.
                panner->setPosition({x, 0.1f, 0.1f});
                Wait(10);
            }
        }
        else
        {
            std::cerr << "Couldn't initialize train node to play" << std::endl;
        }
    }
};

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