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/*
* Copyright (c) 2021, kleines Filmröllchen <filmroellchen@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Optional.h>
#include <AK/Types.h>
#include <LibDSP/Processor.h>
#include <LibDSP/Track.h>
using namespace std;
namespace LibDSP {
bool Track::add_processor(NonnullRefPtr<Processor> new_processor)
{
m_processor_chain.append(move(new_processor));
if (!check_processor_chain_valid()) {
(void)m_processor_chain.take_last();
return false;
}
return true;
}
bool Track::check_processor_chain_valid_with_initial_type(SignalType initial_type) const
{
Processor const* previous_processor = nullptr;
for (auto& processor : m_processor_chain) {
// The first processor must have the given initial signal type as input.
if (previous_processor == nullptr) {
if (processor.input_type() != initial_type)
return false;
} else if (previous_processor->output_type() != processor.input_type())
return false;
previous_processor = &processor;
}
return true;
}
bool AudioTrack::check_processor_chain_valid() const
{
return check_processor_chain_valid_with_initial_type(SignalType::Sample);
}
bool NoteTrack::check_processor_chain_valid() const
{
return check_processor_chain_valid_with_initial_type(SignalType::Note);
}
Sample Track::current_signal()
{
compute_current_clips_signal();
Optional<Signal> the_signal;
for (auto& processor : m_processor_chain) {
the_signal = processor.process(the_signal.value_or(m_current_signal));
}
VERIFY(the_signal.has_value() && the_signal->type() == SignalType::Sample);
return the_signal->get<Sample>();
}
void NoteTrack::compute_current_clips_signal()
{
u32 time = m_transport->time();
// Find the currently playing clip.
NoteClip* playing_clip = nullptr;
for (auto& clip : m_clips) {
if (clip.start() <= time && clip.end() >= time) {
playing_clip = &clip;
break;
}
}
auto& current_notes = m_current_signal.get<RollNotes>();
m_current_signal.get<RollNotes>().clear_with_capacity();
if (playing_clip == nullptr)
return;
// FIXME: performance?
for (auto const& note_list : playing_clip->notes()) {
for (auto const& note : note_list) {
if (note.on_sample >= time && note.off_sample >= time)
break;
if (note.on_sample <= time && note.off_sample >= time)
current_notes.set(note.pitch, note);
}
}
}
void AudioTrack::compute_current_clips_signal()
{
// Find the currently playing clip.
u32 time = m_transport->time();
AudioClip* playing_clip = nullptr;
for (auto& clip : m_clips) {
if (clip.start() <= time && clip.end() >= time) {
playing_clip = &clip;
break;
}
}
if (playing_clip == nullptr) {
m_current_signal = Signal(static_cast<Sample const&>(SAMPLE_OFF));
}
// Index into the clip's samples.
u32 effective_sample = time - playing_clip->start();
m_current_signal = Signal(playing_clip->sample_at(effective_sample));
}
}
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