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| author | Martin Dahlgren <mdahlgrengadd@users.noreply.github.com> | 2019-06-03 12:58:33 +0200 |
|---|---|---|
| committer | Martin Dahlgren <mdahlgrengadd@users.noreply.github.com> | 2019-06-03 12:58:33 +0200 |
| commit | 17adece6ad2c3b07a5fc8180245b507e9285c8fe (patch) | |
| tree | 79a4f221b8b4b326b7fea593f5e34af066a8ef6e | |
| parent | f78c7377c914f9f2f7dc428030a7cf07f7614df0 (diff) | |
| download | redot-engine-17adece6ad2c3b07a5fc8180245b507e9285c8fe.tar.gz | |
Add windowing before FFT to avoid flickering spectrogram
| -rw-r--r-- | servers/audio/effects/audio_effect_spectrum_analyzer.cpp | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/servers/audio/effects/audio_effect_spectrum_analyzer.cpp b/servers/audio/effects/audio_effect_spectrum_analyzer.cpp index 05cba416be..5a201b7dfa 100644 --- a/servers/audio/effects/audio_effect_spectrum_analyzer.cpp +++ b/servers/audio/effects/audio_effect_spectrum_analyzer.cpp @@ -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; } |