22f93bccb4
Reworked the handling of ALSA RawMidi input to support:
- Running Status.
- RealTime Category messages arriving during other messages data.
- Multiple connected RawMidi interfaces.
(cherry picked from commit 81575174cb)
106 lines
3.9 KiB
C++
106 lines
3.9 KiB
C++
/*************************************************************************/
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/* midi_driver_alsamidi.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) 2007-2022 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
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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_ALSAMIDI_H
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#define MIDI_DRIVER_ALSAMIDI_H
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#ifdef ALSAMIDI_ENABLED
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#include "core/os/midi_driver.h"
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#include "core/os/mutex.h"
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#include "core/os/thread.h"
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#include "core/safe_refcount.h"
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#include "core/vector.h"
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#include "../alsa/asound-so_wrap.h"
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#include <stdio.h>
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class MIDIDriverALSAMidi : public MIDIDriver {
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Thread thread;
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Mutex mutex;
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class InputConnection {
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public:
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InputConnection() = default;
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InputConnection(snd_rawmidi_t *midi_in) :
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rawmidi_ptr{ midi_in } {}
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// Read in and parse available data, forwarding any complete messages through the driver.
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int read_in(MIDIDriverALSAMidi &driver, uint64_t timestamp);
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snd_rawmidi_t *rawmidi_ptr = nullptr;
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private:
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static const size_t MSG_BUFFER_SIZE = 3;
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uint8_t buffer[MSG_BUFFER_SIZE] = { 0 };
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size_t expected_data = 0;
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size_t received_data = 0;
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bool skipping_sys_ex = false;
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void parse_byte(uint8_t byte, MIDIDriverALSAMidi &driver, uint64_t timestamp);
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};
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Vector<InputConnection> connected_inputs;
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SafeFlag exit_thread;
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static void thread_func(void *p_udata);
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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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// If the passed byte is a status byte, return the associated message category,
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// else return MessageCategory::Data.
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static MessageCategory msg_category(uint8_t msg_part);
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// Return the number of data bytes expected for the provided status byte.
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static size_t msg_expected_data(uint8_t status_byte);
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void lock() const;
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void unlock() const;
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public:
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virtual Error open();
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virtual void close();
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virtual PoolStringArray get_connected_inputs();
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MIDIDriverALSAMidi();
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virtual ~MIDIDriverALSAMidi();
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};
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#endif // ALSAMIDI_ENABLED
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#endif // MIDI_DRIVER_ALSAMIDI_H
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