Class BeepGenerator

examples/audio_beep_player.cpp:41–112

 */

struct BeepGenerator    : public choc::audio::io::AudioMIDICallback
{
    BeepGenerator() : sineWave()
    {
        sineWave.setFrequency (440.0f, 44100.0f);
    }

    void sampleRateChanged (double newRate) override
    {
        std::cout << "Sample rate changed to: " << newRate << " Hz" << std::endl;
        sineWave.setFrequency (440.0f, static_cast<float> (newRate));
        maxSamples = static_cast<uint32_t> (2 * newRate);
    }

    void startBlock() override
    {
    }

    void processSubBlock (const choc::audio::AudioMIDIBlockDispatcher::Block& block,
                          bool replaceOutput) override
    {
        auto& output = block.audioOutput;

        if (! isPlaying)
        {
            if (replaceOutput)
                output.clear();

            return;
        }

        auto numFrames = output.getNumFrames();
        auto numChannels = output.getNumChannels();

        for (uint32_t frame = 0; frame < numFrames; ++frame)
        {
            if (samplesPlayed >= maxSamples)
            {
                isPlaying = false;

                for (uint32_t channel = 0; channel < numChannels; ++channel)
                    output.getSample (channel, frame) = 0.0f;

                continue;
            }

            auto sample = sineWave.getSample() * 0.1f;

            for (uint32_t channel = 0; channel < numChannels; ++channel)
            {
                if (replaceOutput)
                    output.getSample (channel, frame) = sample;
                else
                    output.getSample (channel, frame) += sample;
            }

            ++samplesPlayed;
        }