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Piano: Rewrite application
Goals: - Switch to a more typical LibGUI arrangement - Separate GUI (MainWidget) and audio (AudioEngine) - Improve on existing features while retaining the same feature set Improvements: - Each GUI element is a separate widget - The wave (WaveWidget) scales with the window - The piano roll (RollWidget) scales horizontally and scrolls vertically - The piano (KeysWidget) fits as many notes as possible - The knobs (KnobsWidget) are now sliders - All mouse and key events are handled in constant time - The octave can be changed while playing notes - The same note can be played with the mouse, keyboard and roll at the same time, and the volume of the resulting note is scaled accordingly - Note frequency constants use the maximum precision available in a double
This commit is contained in:
William McPherson
Andreas Kling
parent
ddefb95b21
commit
4a36a51618
17 changed files with 1647 additions and 762 deletions
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@ -1,5 +1,6 @@
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/*
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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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@ -27,63 +28,186 @@
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#pragma once
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#include <AK/Types.h>
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#include <LibDraw/Color.h>
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namespace Music {
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// CD quality
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// - Stereo
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// - 16 bit
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// - 44,100 samples/sec
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// - 1,411.2 kbps
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struct Sample {
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i16 left;
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i16 right;
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};
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enum WaveType { Sine, Saw, Square, Triangle, Noise, InvalidWave };
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constexpr int sample_count = 1024;
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enum PianoKey {
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K_None,
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K_C1, K_Db1, K_D1, K_Eb1, K_E1, K_F1, K_Gb1, K_G1, K_Ab1, K_A1, K_Bb1, K_B1,
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K_C2, K_Db2, K_D2, K_Eb2, K_E2, K_F2, K_Gb2, K_G2,
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constexpr int buffer_size = sample_count * sizeof(Sample);
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constexpr double sample_rate = 44100;
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constexpr double volume = 1800;
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enum Switch {
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Off,
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On,
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};
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inline bool is_white(PianoKey n)
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{
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switch (n) {
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case K_C1:
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case K_D1:
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case K_E1:
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case K_F1:
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case K_G1:
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case K_A1:
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case K_B1:
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case K_C2:
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case K_D2:
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case K_E2:
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case K_F2:
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case K_G2:
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return true;
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default:
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return false;
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}
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}
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enum Note {
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C1, Db1, D1, Eb1, E1, F1, Gb1, G1, Ab1, A1, Bb1, B1,
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C2, Db2, D2, Eb2, E2, F2, Gb2, G2, Ab2, A2, Bb2, B2,
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C3, Db3, D3, Eb3, E3, F3, Gb3, G3, Ab3, A3, Bb3, B3,
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C4, Db4, D4, Eb4, E4, F4, Gb4, G4, Ab4, A4, Bb4, B4,
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C5, Db5, D5, Eb5, E5, F5, Gb5, G5, Ab5, A5, Bb5, B5,
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C6, Db6, D6, Eb6, E6, F6, Gb6, G6, Ab6, A6, Bb6, B6,
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C7, Db7, D7, Eb7, E7, F7, Gb7, G7, Ab7, A7, Bb7, B7,
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enum Direction {
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Down,
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Up,
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};
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const double note_frequency[] = {
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/* Octave 1 */ 32.70, 34.65, 36.71, 38.89, 41.20, 43.65, 46.25, 49.00, 51.91, 55.00, 58.27, 61.74,
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/* Octave 2 */ 65.41, 69.30, 73.42, 77.78, 82.41, 87.31, 92.50, 98.00, 103.83, 110.00, 116.54, 123.47,
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/* Octave 3 */ 130.81, 138.59, 146.83, 155.56, 164.81, 174.61, 185.00, 196.00, 207.65, 220.00, 233.08, 246.94,
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/* Octave 4 */ 261.63, 277.18, 293.66, 311.13, 329.63, 349.23, 369.99, 392.00, 415.30, 440.00, 466.16, 493.88,
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/* Octave 5 */ 523.25, 554.37, 587.33, 622.25, 659.25, 698.46, 739.99, 783.99, 830.61, 880.00, 932.33, 987.77,
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/* Octave 6 */ 1046.50, 1108.73, 1174.66, 1244.51, 1318.51, 1396.91, 1479.98, 1567.98, 1661.22, 1760.00, 1864.66, 1975.53,
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/* Octave 7 */ 2093.00, 2217.46, 2349.32, 2489.02, 2637.02, 2793.83, 2959.96, 3135.96, 3322.44, 3520.00, 3729.31, 3951.07,
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enum Wave {
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Sine,
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Triangle,
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Square,
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Saw,
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Noise,
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};
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constexpr const char* wave_strings[] = {
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"Sine",
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"Triangle",
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"Square",
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"Saw",
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"Noise",
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};
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constexpr int first_wave = Sine;
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constexpr int last_wave = Noise;
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enum KeyColor {
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White,
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Black,
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};
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constexpr KeyColor key_pattern[] = {
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White,
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Black,
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White,
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Black,
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White,
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White,
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Black,
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White,
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Black,
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White,
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Black,
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White,
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};
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const Color note_pressed_color(64, 64, 255);
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const Color column_playing_color(128, 128, 255);
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constexpr int notes_per_octave = 12;
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constexpr int white_keys_per_octave = 7;
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constexpr int black_keys_per_octave = 5;
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constexpr int octave_min = 1;
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constexpr int octave_max = 7;
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// Equal temperament, A = 440Hz
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// We calculate note frequencies relative to A4:
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// 440.0 * pow(pow(2.0, 1.0 / 12.0), N)
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// Where N is the note distance from A.
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constexpr double note_frequencies[] = {
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// Octave 1
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32.703195662574764,
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34.647828872108946,
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36.708095989675876,
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38.890872965260044,
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41.203444614108669,
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43.653528929125407,
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46.249302838954222,
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48.99942949771858,
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51.913087197493056,
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54.999999999999915,
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58.270470189761156,
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61.735412657015416,
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// Octave 2
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65.406391325149571,
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69.295657744217934,
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73.416191979351794,
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77.781745930520117,
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82.406889228217381,
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87.307057858250872,
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92.4986056779085,
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97.998858995437217,
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103.82617439498618,
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109.99999999999989,
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116.54094037952237,
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123.4708253140309,
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// Octave 3
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130.8127826502992,
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138.59131548843592,
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146.83238395870364,
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155.56349186104035,
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164.81377845643485,
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174.61411571650183,
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184.99721135581709,
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195.99771799087452,
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207.65234878997245,
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219.99999999999989,
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233.08188075904488,
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246.94165062806198,
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// Octave 4
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261.62556530059851,
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277.18263097687202,
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293.66476791740746,
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311.12698372208081,
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329.62755691286986,
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349.22823143300383,
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369.99442271163434,
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391.99543598174927,
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415.30469757994513,
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440,
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466.16376151808993,
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493.88330125612413,
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// Octave 5
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523.25113060119736,
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554.36526195374427,
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587.32953583481526,
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622.25396744416196,
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659.25511382574007,
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698.456462866008,
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739.98884542326903,
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783.99087196349899,
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830.60939515989071,
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880.00000000000034,
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932.32752303618031,
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987.76660251224882,
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// Octave 6
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1046.5022612023952,
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1108.7305239074892,
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1174.659071669631,
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1244.5079348883246,
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1318.5102276514808,
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1396.9129257320169,
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1479.977690846539,
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1567.9817439269987,
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1661.2187903197821,
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1760.000000000002,
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1864.6550460723618,
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1975.5332050244986,
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// Octave 7
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2093.0045224047913,
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2217.4610478149793,
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2349.3181433392633,
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2489.0158697766506,
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2637.020455302963,
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2793.8258514640347,
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2959.9553816930793,
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3135.9634878539991,
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3322.437580639566,
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3520.0000000000055,
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3729.3100921447249,
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3951.0664100489994,
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};
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constexpr int note_count = sizeof(note_frequencies) / sizeof(double);
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}
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using namespace Music;
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