midi_engine.h

/*
 * Copyright © 2014-2023 Synthstrom Audible Limited
 *
 * This file is part of The Synthstrom Audible Deluge Firmware.
 *
 * The Synthstrom Audible Deluge Firmware is free software: you can redistribute it and/or modify it under the
 * terms of the GNU General Public License as published by the Free Software Foundation,
 * either version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program.
 * If not, see <https://www.gnu.org/licenses/>.
 */
 
#pragma once
 
#ifdef __cplusplus
 
#include "OSLikeStuff/scheduler_api.h"
#include "definitions_cxx.hpp"
#include "io/midi/learned_midi.h"
#include "playback/playback_handler.h"
 
class MIDICable;
class MIDIDrum;
class MIDIInstrument;
class MidiFollow;
class PlaybackHandler;

struct MIDISource {
    void const* source_{nullptr};
 
    MIDISource() = default;
    ~MIDISource() = default;
 
    MIDISource(MIDICable const* cable) : source_(cable) {};
    MIDISource(MIDIInstrument const* instrument) : source_(instrument) {};
    MIDISource(PlaybackHandler const* handler) : source_(handler) {};
    MIDISource(MidiFollow const* follow) : source_(follow) {};
    MIDISource(MIDIDrum const* drum) : source_(drum) {};
    MIDISource(Sound const* sound) : source_(sound) {};
 
    MIDISource(MIDICable const& cable) : source_(&cable) {};
    MIDISource(MIDIInstrument const& instrument) : source_(&instrument) {};
    MIDISource(MIDIDrum const& drum) : source_(&drum) {};
    MIDISource(Sound const& sound) : source_(&sound) {};
    MIDISource(MidiFollow const& follow) : source_(&follow) {};
    MIDISource(PlaybackHandler const& handler) : source_(&handler) {};
 
    MIDISource(MIDISource const& other) = default;
    MIDISource(MIDISource&& other) = default;
 
    MIDISource& operator=(MIDISource const& other) = default;
    MIDISource& operator=(MIDISource&& other) = default;
 
    bool operator==(MIDISource const& other) const { return source_ == other.source_; }
};
 
class MidiEngine {
public:
    MidiEngine();
 
    void sendNote(MIDISource source, bool on, int32_t note, uint8_t velocity, uint8_t channel, int32_t filter);
    void sendCC(MIDISource source, int32_t channel, int32_t cc, int32_t value, int32_t filter);
 
    void sendMidi(MIDISource source, MIDIMessage message, int32_t filter = kMIDIOutputFilterNoMPE, bool sendUSB = true);
    void sendClock(MIDISource source, bool sendUSB = true, int32_t howMany = 1);
    void sendStart(MIDISource source);
    void sendStop(MIDISource source);
    void sendPositionPointer(MIDISource source, uint16_t positionPointer);
    void sendContinue(MIDISource source);
 
    void checkIncomingMidi();
    void flushMIDI();
    void sendUsbMidi(MIDIMessage message, int32_t filter);
 
    void sendPGMChange(MIDISource source, int32_t channel, int32_t pgm, int32_t filter);
    void sendAllNotesOff(MIDISource source, int32_t channel, int32_t filter);
    void sendBank(MIDISource source, int32_t channel, int32_t num, int32_t filter);
    void sendSubBank(MIDISource source, int32_t channel, int32_t num, int32_t filter);
    void sendPitchBend(MIDISource source, int32_t channel, uint16_t bend, int32_t filter);
    void sendChannelAftertouch(MIDISource source, int32_t channel, uint8_t value, int32_t filter);
    void sendPolyphonicAftertouch(MIDISource source, int32_t channel, uint8_t value, uint8_t noteCode, int32_t filter);
    bool anythingInOutputBuffer();
 
    // If bit "16" (actually bit 4) is 1, this is a program change. (Wait, still?)
    LearnedMIDI globalMIDICommands[kNumGlobalMIDICommands];
 
    bool midiThru;
    LearnedMIDI midiFollowChannelType[kNumMIDIFollowChannelTypes]; // A, B, C
    MIDIFollowChannelType midiFollowFeedbackChannelType;           // A, B, C, NONE
    uint8_t midiFollowKitRootNote;
    bool midiFollowDisplayParam;
    MIDIFollowFeedbackAutomationMode midiFollowFeedbackAutomation;
    bool midiFollowFeedbackFilter;
    MIDITakeoverMode midiTakeover;
    bool midiSelectKitRow;
    TaskID routine_task_id;
 
    // shared buffer for formatting sysex messages.
    // Not safe for use in interrupts.
    uint8_t sysex_fmt_buffer[1024];

    void midiMessageReceived(MIDICable& cable, uint8_t statusType, uint8_t channel, uint8_t data1, uint8_t data2,
                             uint32_t* timer = nullptr);

    void midiSysexReceived(MIDICable& cable, uint8_t* data, int32_t len);
 
private:
    uint8_t serialMidiInput[3];
    uint8_t numSerialMidiInput;
 
    bool currentlyReceivingSysExSerial;
 
    using EventStackStorage = std::array<MIDISource, 16>;
    EventStackStorage eventStack_;
    EventStackStorage::iterator eventStackTop_;
};
 
extern MidiEngine midiEngine;
 
extern "C" {
#endif
#ifdef __cplusplus
}
#endif