115 lines
4.4 KiB
C++
115 lines
4.4 KiB
C++
/**************************************************************************/
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/* midi_driver.h */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#ifndef MIDI_DRIVER_H
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#define MIDI_DRIVER_H
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#include "core/typedefs.h"
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#include "core/variant/variant.h"
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/**
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* Multi-Platform abstraction for accessing to MIDI.
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*/
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class MIDIDriver {
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static MIDIDriver *singleton;
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static uint8_t last_received_message;
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protected:
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// Categories of message for parser logic.
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enum class MessageCategory {
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Data,
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Voice,
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SysExBegin,
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SystemCommon, // excluding System Exclusive Begin/End
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SysExEnd,
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RealTime,
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};
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// Convert midi data to InputEventMIDI and send it to Input.
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// p_data_len is the length of the buffer passed at p_data, this must be
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// at least equal to the data required by the passed message type, but
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// may be larger. Only the required data will be read.
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static void send_event(int p_device_index, uint8_t p_status,
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const uint8_t *p_data = nullptr, size_t p_data_len = 0);
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class Parser {
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public:
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Parser() = default;
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Parser(int p_device_index) :
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device_index{ p_device_index } {}
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virtual ~Parser() = default;
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// Push a byte of MIDI stream. Any completed messages will be
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// forwarded to MIDIDriver::send_event.
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void parse_fragment(uint8_t p_fragment);
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static MessageCategory category(uint8_t p_midi_fragment);
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// If the byte is a Voice Message status byte return the contained
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// channel number, otherwise zero.
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static uint8_t channel(uint8_t p_status_byte);
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// If the byte is a status byte for a message with a fixed number of
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// additional data bytes, return the number expected, otherwise zero.
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static size_t expected_data(uint8_t p_status_byte);
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static size_t expected_data(MIDIMessage p_msg_type);
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// If the fragment is a status byte return the message type
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// represented, otherwise MIDIMessage::NONE.
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static MIDIMessage status_to_msg_enum(uint8_t p_status_byte);
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private:
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int device_index = 0;
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static constexpr size_t DATA_BUFFER_SIZE = 2;
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uint8_t status_byte = 0;
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uint8_t data_buffer[DATA_BUFFER_SIZE] = { 0 };
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size_t received_data_len = 0;
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bool skipping_sys_ex = false;
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};
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PackedStringArray connected_input_names;
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public:
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static MIDIDriver *get_singleton();
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MIDIDriver();
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virtual ~MIDIDriver() = default;
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virtual Error open() = 0;
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virtual void close() = 0;
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PackedStringArray get_connected_inputs() const;
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};
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#endif // MIDI_DRIVER_H
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