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79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2019-2020, William McPherson <willmcpherson2@gmail.com>
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* Copyright (c) 2021, JJ Roberts-White <computerfido@gmail.com>
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* Copyright (c) 2022, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "TrackManager.h"
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#include "Music.h"
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#include <AK/NoAllocationGuard.h>
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#include <AK/NonnullRefPtr.h>
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#include <AK/TypedTransfer.h>
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#include <LibDSP/Effects.h>
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#include <LibDSP/Synthesizers.h>
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TrackManager::TrackManager()
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: m_transport(make_ref_counted<DSP::Transport>(120, 4))
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, m_keyboard(make_ref_counted<DSP::Keyboard>(m_transport))
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, m_temporary_track_buffer(FixedArray<DSP::Sample>::must_create_but_fixme_should_propagate_errors(sample_count))
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{
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add_track();
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}
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void TrackManager::time_forward(int amount)
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{
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int new_value = (static_cast<int>(m_transport->time()) + amount) % roll_length;
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if (new_value < 0) { // If the new time value is negative add roll_length to wrap around
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m_transport->set_time(roll_length + new_value);
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} else {
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m_transport->set_time(new_value);
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}
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}
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void TrackManager::fill_buffer(FixedArray<DSP::Sample>& buffer)
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{
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NoAllocationGuard guard;
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VERIFY(buffer.size() == m_temporary_track_buffer.size());
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size_t sample_count = buffer.size();
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// No need to zero the temp buffer as the track overwrites it anyways.
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buffer.fill_with({});
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for (auto& track : m_tracks) {
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track->current_signal(m_temporary_track_buffer);
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for (size_t i = 0; i < sample_count; ++i)
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buffer[i] += m_temporary_track_buffer[i];
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}
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m_transport->set_time(m_transport->time() + sample_count);
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// FIXME: This should be handled automatically by Transport. It will also advance slightly past the loop point if we're unlucky.
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if (m_transport->time() >= roll_length)
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m_transport->set_time(0);
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}
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void TrackManager::reset()
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{
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m_transport->set_time(0);
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}
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void TrackManager::add_track()
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{
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auto new_track = make_ref_counted<DSP::NoteTrack>(m_transport, m_keyboard);
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MUST(new_track->resize_internal_buffers_to(m_temporary_track_buffer.size()));
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new_track->add_processor(make_ref_counted<DSP::Synthesizers::Classic>(m_transport));
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new_track->add_processor(make_ref_counted<DSP::Effects::Delay>(m_transport));
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new_track->add_clip(0, roll_length);
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m_tracks.append(move(new_track));
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}
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int TrackManager::next_track_index() const
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{
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auto next_track_index = m_current_track + 1;
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if (next_track_index >= m_tracks.size())
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return 0;
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return static_cast<int>(next_track_index);
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}
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