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Piano: Use LibDSP to implement delay

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This is the first step in transitioning Piano to a full LibDSP backend.
For now, the delay effect is replaced with a (mostly identical)
implementation in LibDSP.

The new ProcessorParameterSlider attaches to a LibDSP::Processor's
range parameter (LibDSP::ProcessorRangeParameter) and changes it
automatically. It also has the ability to update an external GUI::Label.
This is used for the three delay parameters and it will become useful
for auto-generating UI for Processors.
This commit is contained in:
kleines Filmröllchen 2021-08-27 16:20:09 +02:00 • committed by Ali Mohammad Pur
parent a749b16674
commit 0dc6fe9102
8 changed files with 84 additions and 49 deletions
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28
Userland/Applications/Piano/Track.cpp
View file

@ -10,10 +10,13 @@
#include <AK/Math.h>
#include <AK/NumericLimits.h>
#include <LibAudio/Loader.h>
#include <LibDSP/Music.h>
#include <math.h>
Track::Track(const u32& time)
: m_time(time)
, m_temporary_transport(create<LibDSP::Transport>(120, 4))
, m_delay(create<LibDSP::Effects::Delay>(m_temporary_transport))
{
set_volume(volume_max);
set_sustain_impl(1000);
@ -96,14 +99,11 @@ void Track::fill_sample(Sample& sample)
new_sample.right += note_sample.right * m_power[note] * volume_factor * (static_cast<double>(volume()) / volume_max);
}
if (m_delay) {
new_sample.left += m_delay_buffer[m_delay_index].left * 0.333333;
new_sample.right += m_delay_buffer[m_delay_index].right * 0.333333;
m_delay_buffer[m_delay_index].left = new_sample.left;
m_delay_buffer[m_delay_index].right = new_sample.right;
if (++m_delay_index >= m_delay_samples)
m_delay_index = 0;
}
auto new_sample_dsp = LibDSP::Signal(LibDSP::Sample { new_sample.left / NumericLimits<i16>::max(), new_sample.right / NumericLimits<i16>::max() });
auto delayed_sample = m_delay->process(new_sample_dsp).get<LibDSP::Sample>();
new_sample.left = delayed_sample.left * NumericLimits<i16>::max();
new_sample.right = delayed_sample.right * NumericLimits<i16>::max();
sample.left += new_sample.left;
sample.right += new_sample.right;
@ -111,8 +111,6 @@ void Track::fill_sample(Sample& sample)
void Track::reset()
{
memset(m_delay_buffer.data(), 0, m_delay_buffer.size() * sizeof(Sample));
m_delay_index = 0;
memset(m_note_on, 0, sizeof(m_note_on));
memset(m_power, 0, sizeof(m_power));
@ -360,13 +358,3 @@ void Track::set_release(int release)
VERIFY(release >= 0);
m_release = release;
}
void Track::set_delay(int delay)
{
VERIFY(delay >= 0);
m_delay = delay;
m_delay_samples = m_delay == 0 ? 0 : (sample_rate / (beats_per_minute / 60)) / m_delay;
m_delay_buffer.resize(m_delay_samples);
memset(m_delay_buffer.data(), 0, m_delay_buffer.size() * sizeof(Sample));
m_delay_index = 0;
}