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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2019-2020, William McPherson <willmcpherson2@gmail.com>
* Copyright (c) 2021, kleines Filmröllchen <filmroellchen@serenityos.org>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "Track.h"
#include <AK/Forward.h>
#include <AK/Math.h>
#include <AK/NonnullRefPtr.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(LibDSP::Transport::construct(120, 4))
, m_delay(make_ref_counted<LibDSP::Effects::Delay>(m_temporary_transport))
, m_synth(make_ref_counted<LibDSP::Synthesizers::Classic>(m_temporary_transport))
{
set_volume(volume_max);
}
void Track::fill_sample(Sample& sample)
{
m_temporary_transport->time() = m_time;
auto playing_notes = LibDSP::RollNotes {};
for (size_t i = 0; i < note_count; ++i) {
auto& notes_at_pitch = m_roll_notes[i];
for (auto& note : notes_at_pitch) {
if (note.is_playing(m_time))
playing_notes.set(i, note);
}
auto& key_at_pitch = m_keyboard_notes[i];
if (key_at_pitch.has_value() && key_at_pitch.value().is_playing(m_time))
playing_notes.set(i, key_at_pitch.value());
// No need to keep non-playing keyboard notes around.
else
m_keyboard_notes[i] = {};
}
auto synthesized_sample = m_synth->process(playing_notes).get<LibDSP::Sample>();
auto delayed_sample = m_delay->process(synthesized_sample).get<LibDSP::Sample>();
// HACK: Convert to old Piano range: 16-bit int
delayed_sample *= NumericLimits<i16>::max();
delayed_sample.left = clamp(delayed_sample.left, NumericLimits<i16>::min(), NumericLimits<i16>::max());
delayed_sample.right = clamp(delayed_sample.right, NumericLimits<i16>::min(), NumericLimits<i16>::max());
// TODO: Use the master processor
delayed_sample *= static_cast<double>(m_volume) / static_cast<double>(volume_max) * volume_factor;
sample.left += delayed_sample.left;
sample.right += delayed_sample.right;
}
void Track::reset()
{
for (size_t note = 0; note < note_count; ++note)
m_roll_iterators[note] = m_roll_notes[note].begin();
}
void Track::sync_roll(int note)
{
auto it = m_roll_notes[note].find_if([&](auto& roll_note) { return roll_note.off_sample > m_time; });
if (it.is_end())
m_roll_iterators[note] = m_roll_notes[note].begin();
else
m_roll_iterators[note] = it;
}
void Track::set_roll_note(int note, u32 on_sample, u32 off_sample)
{
RollNote new_roll_note = { on_sample, off_sample, (u8)note, 0 };
VERIFY(note >= 0 && note < note_count);
VERIFY(new_roll_note.off_sample < roll_length);
VERIFY(new_roll_note.length() >= 2);
for (auto it = m_roll_notes[note].begin(); !it.is_end();) {
if (it->on_sample > new_roll_note.off_sample) {
m_roll_notes[note].insert_before(it, new_roll_note);
sync_roll(note);
return;
}
if (it->on_sample <= new_roll_note.on_sample && it->off_sample >= new_roll_note.on_sample) {
it.remove(m_roll_notes[note]);
sync_roll(note);
return;
}
if ((new_roll_note.on_sample == 0 || it->on_sample >= new_roll_note.on_sample - 1) && it->on_sample <= new_roll_note.off_sample) {
it.remove(m_roll_notes[note]);
it = m_roll_notes[note].begin();
continue;
}
++it;
}
m_roll_notes[note].append(new_roll_note);
sync_roll(note);
}
void Track::set_keyboard_note(int note, Switch state)
{
VERIFY(note >= 0 && note < note_count);
if (state == Switch::Off) {
// If the note is playing, we need to start releasing it, otherwise just delete
if (auto& maybe_roll_note = m_keyboard_notes[note]; maybe_roll_note.has_value()) {
auto& roll_note = maybe_roll_note.value();
if (roll_note.is_playing(m_time))
roll_note.off_sample = m_time;
else
m_keyboard_notes[note] = {};
}
} else
// FIXME: The end time needs to be far in the future.
m_keyboard_notes[note]
= RollNote { m_time, m_time + static_cast<u32>(sample_rate) * 10'000, static_cast<u8>(note), 0 };
}
void Track::set_volume(int volume)
{
VERIFY(volume >= 0);
m_volume = volume;
}
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