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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2019-2020, William McPherson <willmcpherson2@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "Music.h"
#include <AK/FixedArray.h>
#include <AK/Noncopyable.h>
#include <AK/Queue.h>
class AudioEngine {
AK_MAKE_NONCOPYABLE(AudioEngine)
AK_MAKE_NONMOVABLE(AudioEngine)
public:
AudioEngine();
~AudioEngine();
const FixedArray<Sample>& buffer() const { return *m_front_buffer_ptr; }
int octave() const { return m_octave; }
int octave_base() const { return (m_octave - octave_min) * 12; }
int wave() const { return m_wave; }
int attack() const { return m_attack; }
int decay() const { return m_decay; }
int sustain() const { return m_sustain; }
int release() const { return m_release; }
int delay() const { return m_delay; }
int time() const { return m_time; }
int tick() const { return m_tick; }
void fill_buffer(FixedArray<Sample>& buffer);
void set_note(int note, Switch);
void set_note_current_octave(int note, Switch);
void set_octave(Direction);
void set_wave(int wave);
void set_wave(Direction);
void set_attack(int attack);
void set_decay(int decay);
void set_sustain(int sustain);
void set_release(int release);
void set_delay(int delay);
private:
double sine(size_t note);
double saw(size_t note);
double square(size_t note);
double triangle(size_t note);
double noise() const;
void set_sustain_impl(int sustain);
FixedArray<Sample> m_front_buffer { sample_count };
FixedArray<Sample> m_back_buffer { sample_count };
FixedArray<Sample>* m_front_buffer_ptr { &m_front_buffer };
FixedArray<Sample>* m_back_buffer_ptr { &m_back_buffer };
Queue<NonnullOwnPtr<FixedArray<Sample>>> m_delay_buffers;
u8 m_note_on[note_count] { 0 };
double m_power[note_count] { 0 };
double m_pos[note_count]; // Initialized lazily.
Envelope m_envelope[note_count] { Done };
int m_octave { 4 };
int m_wave { first_wave };
int m_attack;
double m_attack_step;
int m_decay;
double m_decay_step;
int m_sustain;
double m_sustain_level;
int m_release;
double m_release_step[note_count];
int m_delay { 0 };
int m_time { 0 };
int m_tick { 8 };
};
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