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SoundPlayer: Auto refresh visualization widgets

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Visualization widgets should only have to tell how many samples they
need per frame and have a render method which receives all data relevant
to draw the next frame.
This commit is contained in:
Arne Elster 2022-01-09 22:46:06 +01:00 • committed by Andreas Kling
parent 02462b6068
commit 9edaa033e5
7 changed files with 115 additions and 107 deletions
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68
Userland/Applications/SoundPlayer/BarsVisualizationWidget.cpp
View file

@ -13,9 +13,7 @@
#include <LibGUI/Painter.h>
#include <LibGUI/Window.h>
u32 round_previous_power_of_2(u32 x);
void BarsVisualizationWidget::paint_event(GUI::PaintEvent& event)
void BarsVisualizationWidget::render(GUI::PaintEvent& event, FixedArray<double> const& samples)
{
GUI::Frame::paint_event(event);
GUI::Painter painter(*this);
@ -23,13 +21,13 @@ void BarsVisualizationWidget::paint_event(GUI::PaintEvent& event)
painter.add_clip_rect(event.rect());
painter.fill_rect(frame_inner_rect(), Color::Black);
if (m_sample_buffer.is_empty())
return;
for (size_t i = 0; i < samples.size(); i++)
m_fft_samples[i] = samples[i];
LibDSP::fft(m_sample_buffer.span(), false);
double max = AK::sqrt(m_sample_count * 2.);
LibDSP::fft(m_fft_samples.span(), false);
double max = AK::sqrt(samples.size() * 2.);
double freq_bin = m_samplerate / (double)m_sample_count;
double freq_bin = m_samplerate / (double)samples.size();
constexpr int group_count = 60;
Vector<double, group_count> groups;
@ -42,9 +40,9 @@ void BarsVisualizationWidget::paint_event(GUI::PaintEvent& event)
for (double& d : groups)
d = 0.;
int bins_per_group = ceil_div((m_sample_count - 1) / 2, group_count);
for (int i = 1; i < m_sample_count / 2; i++) {
groups[i / bins_per_group] += AK::fabs(m_sample_buffer.data()[i].real());
int bins_per_group = ceil_div((samples.size() - 1) / 2, static_cast<size_t>(group_count));
for (size_t i = 1; i < samples.size() / 2; i++) {
groups[i / bins_per_group] += AK::abs(m_fft_samples[i].real());
}
for (int i = 0; i < group_count; i++)
groups[i] /= max * freq_bin / (m_adjust_frequencies ? (clamp(AK::exp((double)i / group_count * 3.) - 1.75, 1., 15.)) : 1.);
@ -67,7 +65,8 @@ void BarsVisualizationWidget::paint_event(GUI::PaintEvent& event)
}
BarsVisualizationWidget::BarsVisualizationWidget()
: m_is_using_last(false)
: m_fft_samples(MUST(FixedArray<Complex<double>>::try_create(128)))
, m_is_using_last(false)
, m_adjust_frequencies(true)
{
m_context_menu = GUI::Menu::construct();
@ -76,54 +75,11 @@ BarsVisualizationWidget::BarsVisualizationWidget()
});
frequency_energy_action->set_checked(true);
m_context_menu->add_action(frequency_energy_action);
}
// black magic from Hacker's delight
u32 round_previous_power_of_2(u32 x)
{
x = x | (x >> 1);
x = x | (x >> 2);
x = x | (x >> 4);
x = x | (x >> 8);
x = x | (x >> 16);
return x - (x >> 1);
}
void BarsVisualizationWidget::set_buffer(RefPtr<Audio::Buffer> buffer, int samples_to_use)
{
if (m_is_using_last)
return;
m_is_using_last = true;
// FIXME: We should dynamically adapt to the sample count and e.g. perform the fft over multiple buffers.
// For now, the visualizer doesn't work with extremely low global sample rates.
if (buffer->sample_count() < 256) {
m_is_using_last = false;
return;
}
m_sample_count = round_previous_power_of_2(samples_to_use);
m_sample_buffer.resize(m_sample_count);
for (int i = 0; i < m_sample_count; i++) {
m_sample_buffer.data()[i] = (AK::fabs(buffer->samples()[i].left) + AK::fabs(buffer->samples()[i].right)) / 2.;
}
update();
}
void BarsVisualizationWidget::set_buffer(RefPtr<Audio::Buffer> buffer)
{
if (buffer.is_null())
return;
if (m_last_id == buffer->id())
return;
set_buffer(buffer, buffer->sample_count());
MUST(set_render_sample_count(128));
}
void BarsVisualizationWidget::context_menu_event(GUI::ContextMenuEvent& event)
{
m_context_menu->popup(event.screen_position());
}
void BarsVisualizationWidget::set_samplerate(int samplerate)
{
m_samplerate = samplerate;
}