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Add windowing before FFT to avoid flickering spectrogram

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This commit is contained in:
Martin Dahlgren 2019-06-03 12:58:33 +02:00
parent f78c7377c9
commit 17adece6ad
1 changed files with 3 additions and 2 deletions
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5
servers/audio/effects/audio_effect_spectrum_analyzer.cpp
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@ -81,9 +81,10 @@ void AudioEffectSpectrumAnalyzerInstance::process(const AudioFrame *p_src_frames
float *fftw = temporal_fft.ptrw();
for (int i = 0; i < to_fill; i++) { //left and right buffers
fftw[(i + temporal_fft_pos) * 2] = p_src_frames[i].l;
float window = -0.5 * Math::cos(2.0 * Math_PI * (double)i / (double)to_fill) + 0.5;
fftw[(i + temporal_fft_pos) * 2] = window * p_src_frames[i].l;
fftw[(i + temporal_fft_pos) * 2 + 1] = 0;
fftw[(i + temporal_fft_pos + fft_size * 2) * 2] = p_src_frames[i].r;
fftw[(i + temporal_fft_pos + fft_size * 2) * 2] = window * p_src_frames[i].r;
fftw[(i + temporal_fft_pos + fft_size * 2) * 2 + 1] = 0;
}