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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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82
Userland/Applications/SoundPlayer/VisualizationWidget.h
View file

@ -6,18 +6,94 @@
#pragma once
#include <AK/Forward.h>
#include <AK/TypedTransfer.h>
#include <LibAudio/Buffer.h>
#include <LibGUI/Frame.h>
#include <LibGUI/Painter.h>
class VisualizationWidget : public GUI::Frame {
C_OBJECT(VisualizationWidget)
public:
virtual void set_buffer(RefPtr<Audio::Buffer> buffer) = 0;
virtual void set_samplerate(int) { }
virtual void render(GUI::PaintEvent&, FixedArray<double> const& samples) = 0;
void set_buffer(RefPtr<Audio::Buffer> buffer)
{
if (buffer.is_null())
return;
if (buffer->id() == m_last_buffer_id)
return;
m_last_buffer_id = buffer->id();
if (m_sample_buffer.size() != static_cast<size_t>(buffer->sample_count()))
m_sample_buffer.resize(buffer->sample_count());
for (size_t i = 0; i < static_cast<size_t>(buffer->sample_count()); i++)
m_sample_buffer.data()[i] = (buffer->samples()[i].left + buffer->samples()[i].right) / 2.;
m_frame_count = 0;
}
virtual void set_samplerate(int samplerate)
{
m_samplerate = samplerate;
}
virtual void paint_event(GUI::PaintEvent& event) override
{
if (m_sample_buffer.size() == 0) {
Frame::paint_event(event);
GUI::Painter painter(*this);
painter.add_clip_rect(event.rect());
painter.fill_rect(frame_inner_rect(), Color::Black);
return;
}
if (m_render_buffer.size() == 0)
return;
size_t buffer_position = (m_frame_count * REFRESH_TIME_MILLISECONDS) * m_samplerate / 1000;
if (buffer_position + m_render_buffer.size() >= m_sample_buffer.size())
buffer_position = m_sample_buffer.size() - m_render_buffer.size();
AK::TypedTransfer<double>::copy(m_render_buffer.data(), m_sample_buffer.span().slice(buffer_position).data(), m_render_buffer.size());
render(event, m_render_buffer);
}
virtual void timer_event(Core::TimerEvent&) override
{
update();
m_frame_count++;
}
size_t frame_count() const { return m_frame_count; }
ErrorOr<void> set_render_sample_count(size_t count)
{
auto new_buffer = TRY(FixedArray<double>::try_create(count));
m_render_buffer.swap(new_buffer);
return {};
}
virtual void start_new_file(StringView) { }
protected:
VisualizationWidget() = default;
int m_samplerate;
int m_last_buffer_id;
size_t m_frame_count;
Vector<double> m_sample_buffer;
FixedArray<double> m_render_buffer;
static constexpr size_t REFRESH_TIME_MILLISECONDS = 30;
VisualizationWidget()
: m_samplerate(-1)
, m_last_buffer_id(-1)
, m_frame_count(0)
{
start_timer(REFRESH_TIME_MILLISECONDS);
}
virtual ~VisualizationWidget() = default;
};