Method updateWindow

src/audio_effects/STFT.cpp:107–141

void STFT::updateWindow(const int new_window_type)
{
    window_type = new_window_type;

    switch (window_type) {
        case RECTANGULAR: {
            for (int sample = 0; sample < fft_size; ++sample)
                fft_window[sample] = 1.0f;
            break;
        }
        case BART_LETT: {
            for (int sample = 0; sample < fft_size; ++sample)
                fft_window[sample] = 1.0f - fabs (2.0f * (float)sample / (float)(fft_size - 1) - 1.0f);
            break;
        }
        case HANN: {
            for (int sample = 0; sample < fft_size; ++sample)
                fft_window[sample] = 0.5f - 0.5f * cosf (2.0f * M_PI * (float)sample / (float)(fft_size - 1));
            break;
        }
        case HAMMING: {
            for (int sample = 0; sample < fft_size; ++sample)
                fft_window[sample] = 0.54f - 0.46f * cosf (2.0f * M_PI * (float)sample / (float)(fft_size - 1));
            break;
        }
    }

    float window_sum = 0.0f;
    for (int sample = 0; sample < fft_size; ++sample)
        window_sum += fft_window[sample];

    window_scale_factor = 0.0f;
    if (overlap != 0 && window_sum != 0.0f)
        window_scale_factor = 1.0f / (float)overlap / window_sum * (float)fft_size;
}