mirror of
https://github.com/RGBCube/serenity
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c2340a1b1f
Previously, a collection of notes (Vector or Array) would be created and promptly deleted for every sample (at least 44 thousand times per second!). This was measured to be one of the most significant performance drawbacks as well as the most obvious performance improvement I could currently find here. Although it will not cause Piano to lag currently (at least on virtualized systems), I see an incoming issue once we get the capability to use more processors. Now, we use a HashMap correlating pitches to notes, and Track reuses the data structure in order to avoid reallocations. That is the reason for introducing the fast clear_with_capacity to HashMap.
149 lines
3.4 KiB
C++
149 lines
3.4 KiB
C++
/*
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* Copyright (c) 2021, kleines Filmröllchen <malu.bertsch@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/HashMap.h>
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#include <AK/Types.h>
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#include <AK/Variant.h>
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#include <AK/Vector.h>
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#include <LibAudio/Buffer.h>
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namespace LibDSP {
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// FIXME: Audio::Frame is 64-bit float, which is quite large for long clips.
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using Sample = Audio::Sample;
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Sample const SAMPLE_OFF = { 0.0, 0.0 };
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struct RollNote {
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constexpr u32 length() const { return (off_sample - on_sample) + 1; }
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u32 on_sample;
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u32 off_sample;
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u8 pitch;
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i8 velocity;
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};
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enum class SignalType : u8 {
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Invalid,
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Sample,
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Note
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};
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using RollNotes = OrderedHashMap<u8, RollNote>;
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struct Signal : public Variant<Sample, RollNotes> {
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using Variant::Variant;
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ALWAYS_INLINE SignalType type() const
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{
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return has<Sample>() ? SignalType::Sample : has<RollNotes>() ? SignalType::Note
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: SignalType::Invalid;
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}
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};
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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 size_t note_count = array_size(note_frequencies);
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constexpr double middle_c = note_frequencies[36];
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}
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