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LibDSP: Create Classic synth

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The Classic synthesizer is a replication of Piano's old synthesizer
engine that is removed in the next commit.
This commit is contained in:
kleines Filmröllchen 2021-09-28 18:00:12 +02:00 • committed by Andreas Kling
parent 7663fbb19e
commit 3ca059da2d
4 changed files with 221 additions and 1 deletions
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72
Userland/Libraries/LibDSP/Synthesizers.h Normal file
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/*
* Copyright (c) 2021, kleines Filmröllchen <malu.bertsch@gmail.com>.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include "LibDSP/Music.h"
#include <AK/SinglyLinkedList.h>
#include <LibDSP/Processor.h>
#include <LibDSP/ProcessorParameter.h>
#include <LibDSP/Transport.h>
namespace LibDSP::Synthesizers {
enum Waveform : u8 {
Sine,
Triangle,
Square,
Saw,
Noise,
};
struct PitchedEnvelope : Envelope {
constexpr PitchedEnvelope() = default;
constexpr PitchedEnvelope(double envelope, u8 note)
: Envelope(envelope)
, note(note)
{
}
constexpr PitchedEnvelope(Envelope envelope, u8 note)
: Envelope(envelope)
, note(note)
{
}
u8 note;
};
class Classic : public SynthesizerProcessor {
public:
Classic(NonnullRefPtr<Transport>);
static Envelope compute_envelope(RollNote&);
Waveform wave() const { return m_waveform.value(); }
private:
virtual Signal process_impl(Signal const&) override;
double volume_from_envelope(Envelope);
double wave_position(u8 note);
double samples_per_cycle(u8 note);
double sin_position(u8 note);
double triangle_position(u8 note);
double square_position(u8 note);
double saw_position(u8 note);
double noise_position(u8 note);
double get_random_from_seed(u64 note);
ProcessorEnumParameter<Waveform> m_waveform;
ProcessorRangeParameter m_attack;
ProcessorRangeParameter m_decay;
ProcessorRangeParameter m_sustain;
ProcessorRangeParameter m_release;
RollNotes m_playing_notes;
Array<double, note_count> last_random;
};
}