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72cbbd5297
This patch allows roll notes to be of different sizes. This necessitates a new internal representation of time. BPM and time signatures are mostly implemented but not exposed. Roll notes are now sample-accurate and the grid is aligned to 60 BPM 4/4. The roll is divided by the time signature raised to some power of 2, giving the musical divisions of (in the case of 4/4) 16, 32, 64 etc. Before, our timing was derived from the buffer size and we relied on that to implement delay. Delay has been rewritten to be sample-granular. It's now exposed as the proper "divisions of a beat". Something to be wary of is that the last buffer in the loop is also used for the start of the next loop. In other words, we loop mid-buffer. This means we write WAVs with a tiny bit of silence due to breaking the loop after filling half a buffer. The data structure for the roll is an array of SinglyLinkedLists of RollNotes. Separating by pitch (via the array layout) makes insertion much simpler and faster. Using sorted lists (and thus SinglyLinkedListIterators) to do lookups is very quick as you know the sample of the next note and can just compare it to the current sample. I implemented this with HashMaps and the cost of lookups was abysmal. I also tried a single SinglyLinkedList and the insertion code got even more complicated than it already is.
120 lines
4.3 KiB
C++
120 lines
4.3 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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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "Music.h"
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#include <AK/FixedArray.h>
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#include <AK/Noncopyable.h>
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#include <AK/SinglyLinkedList.h>
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#include <LibAudio/Buffer.h>
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typedef AK::SinglyLinkedListIterator<SinglyLinkedList<RollNote>, RollNote> RollIter;
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class AudioEngine {
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AK_MAKE_NONCOPYABLE(AudioEngine)
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AK_MAKE_NONMOVABLE(AudioEngine)
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public:
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AudioEngine();
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~AudioEngine();
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const FixedArray<Sample>& buffer() const { return *m_front_buffer_ptr; }
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const Vector<Audio::Sample>& recorded_sample() const { return m_recorded_sample; }
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const SinglyLinkedList<RollNote>& roll_notes(int note) const { return m_roll_notes[note]; }
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int octave() const { return m_octave; }
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int octave_base() const { return (m_octave - octave_min) * 12; }
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int wave() const { return m_wave; }
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int attack() const { return m_attack; }
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int decay() const { return m_decay; }
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int sustain() const { return m_sustain; }
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int release() const { return m_release; }
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int delay() const { return m_delay; }
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int time() const { return m_time; }
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void fill_buffer(FixedArray<Sample>& buffer);
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void reset();
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void set_should_loop(bool b) { m_should_loop = b; }
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String set_recorded_sample(const StringView& path);
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void set_note(int note, Switch);
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void set_note_current_octave(int note, Switch);
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void set_roll_note(int note, u32 on_sample, u32 off_sample);
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void set_octave(Direction);
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void set_wave(int wave);
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void set_wave(Direction);
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void set_attack(int attack);
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void set_decay(int decay);
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void set_sustain(int sustain);
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void set_release(int release);
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void set_delay(int delay);
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private:
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Audio::Sample sine(size_t note);
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Audio::Sample saw(size_t note);
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Audio::Sample square(size_t note);
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Audio::Sample triangle(size_t note);
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Audio::Sample noise() const;
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Audio::Sample recorded_sample(size_t note);
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void sync_roll(int note);
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void set_sustain_impl(int sustain);
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FixedArray<Sample> m_front_buffer { sample_count };
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FixedArray<Sample> m_back_buffer { sample_count };
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FixedArray<Sample>* m_front_buffer_ptr { &m_front_buffer };
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FixedArray<Sample>* m_back_buffer_ptr { &m_back_buffer };
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Vector<Sample> m_delay_buffer;
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Vector<Audio::Sample> m_recorded_sample;
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u8 m_note_on[note_count] { 0 };
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double m_power[note_count] { 0 };
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double m_pos[note_count]; // Initialized lazily.
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Envelope m_envelope[note_count] { Done };
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int m_octave { 4 };
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int m_wave { first_wave };
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int m_attack;
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double m_attack_step;
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int m_decay;
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double m_decay_step;
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int m_sustain;
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double m_sustain_level;
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int m_release;
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double m_release_step[note_count];
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int m_delay { 0 };
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size_t m_delay_samples { 0 };
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size_t m_delay_index { 0 };
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u32 m_time { 0 };
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bool m_should_loop { true };
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SinglyLinkedList<RollNote> m_roll_notes[note_count];
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RollIter m_roll_iters[note_count];
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};
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