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https://github.com/fergalmoran/ladybird.git
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21266f42f1
For DSP reasons I can't explain myself (yet, sorry), short-time Fourier transform (STFT) is much more accurate and aesthetically pleasing when the windows that select the samples for STFT overlap. This implements that behavior by storing the previous samples and performing windowed FFT over both it as well as the current samples. This gives us 50% overlap between windows, a common standard that is nice to look at.
41 lines
1.1 KiB
C++
41 lines
1.1 KiB
C++
/*
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* Copyright (c) 2021, Cesar Torres <shortanemoia@protonmail.com>
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* Copyright (c) 2022, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include "VisualizationWidget.h"
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#include <AK/Array.h>
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#include <AK/Complex.h>
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#include <AK/FixedArray.h>
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#include <LibAudio/Buffer.h>
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#include <LibGUI/Frame.h>
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class BarsVisualizationWidget final : public VisualizationWidget {
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C_OBJECT(BarsVisualizationWidget)
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public:
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~BarsVisualizationWidget() override = default;
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private:
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BarsVisualizationWidget();
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void render(GUI::PaintEvent&, FixedArray<double> const&) override;
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void context_menu_event(GUI::ContextMenuEvent& event) override;
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static constexpr size_t fft_size = 512;
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static constexpr size_t bar_count = 64;
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static constexpr size_t values_per_bar = (fft_size / 2) / bar_count;
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Array<Complex<double>, fft_size> m_fft_samples {};
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Array<double, fft_size> m_fft_window {};
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Array<double, fft_size / 2> m_previous_samples {};
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Array<int, bar_count> m_gfx_falling_bars {};
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bool m_is_using_last;
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bool m_adjust_frequencies;
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RefPtr<GUI::Menu> m_context_menu;
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};
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