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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.
54 lines
2.0 KiB
C++
54 lines
2.0 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 <LibGUI/ScrollableWidget.h>
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class AudioEngine;
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class RollWidget final : public GUI::ScrollableWidget {
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C_OBJECT(RollWidget)
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public:
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virtual ~RollWidget() override;
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private:
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explicit RollWidget(AudioEngine&);
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virtual void paint_event(GUI::PaintEvent&) override;
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virtual void mousedown_event(GUI::MouseEvent& event) override;
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virtual void mousewheel_event(GUI::MouseEvent&) override;
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AudioEngine& m_audio_engine;
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int m_roll_width;
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int m_num_notes;
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double m_note_width;
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int m_zoom_level { 1 };
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};
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