Audio Visualizer

void EffectWaveform::Update(double deltaTime)
{
    auto sound = Simulator::Instance->GetSound();
    auto system = Simulator::Instance->GetSystem();
    auto dsp = Simulator::Instance->GetDSP();
    double timerMargin = 0.04;

    //WAVEFORM
    m_WaveTimer += deltaTime;

    if (m_WaveTimer > timerMargin && sound != nullptr)
    {
        m_WaveTimer -= timerMargin;

        //Get format
        FMOD_SOUND_TYPE type;
        FMOD_SOUND_FORMAT format;
        int channels, bits;
        sound->getFormat(&type, &format, &channels, &bits);

        //Get software format
        int sampleRate;
        system->getSoftwareFormat(&sampleRate, nullptr, nullptr);

        //Get length
        unsigned int length = 0;
        sound->getLength(&length, FMOD_TIMEUNIT_MS);

        //Get dsp data
        float frequency;
        dsp->getParameterFloat(FMOD_DSP_FFT_DOMINANT_FREQ, &frequency, 0, 0);

        FMOD_DSP_PARAMETER_FFT *data;
        char s[256];
        unsigned int len;
        dsp->getParameterData(FMOD_DSP_FFT_SPECTRUMDATA, (void**)(&data), &len, s, 256);

        //Get wave data
        auto windowsize = 1024;

        auto ch = data->numchannels;
        auto ln = data->length;

        m_WaveformLeft.clear();
        m_WaveformRight.clear();

        if (ch > 0 && ln > 0)
        {
            auto largest = 0.0f;
            auto resize = 1.0f;
            auto localVol = Simulator::Instance->GetVolume();
            if (localVol > 0.0f) resize = 1.0f / localVol;

            for (int channel = 0; channel < ch; ++channel)
            {
                for (int bin = 0; bin < ln / 8; ++bin)
                {
                    auto val = data->spectrum[channel][bin] * 10.0f;

                    if (val > largest) largest = val;

                    if (channel == 0)
                        m_WaveformLeft.push_back(val*resize);
                    else if (channel == 1)
                        m_WaveformRight.push_back(val*resize);
                }
            }

            Simulator::Instance->SetCurrentVolume(largest*resize);
        }
    }
}