godot/drivers/coremidi/midi_driver_coremidi.cpp

/*************************************************************************/
/*  midi_driver_coremidi.cpp                                             */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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#ifdef COREMIDI_ENABLED

#include "midi_driver_coremidi.h"

#include "core/string/print_string.h"

#include <CoreAudio/HostTime.h>
#include <CoreServices/CoreServices.h>

void MIDIDriverCoreMidi::read(const MIDIPacketList *packet_list, void *read_proc_ref_con, void *src_conn_ref_con) {
	MIDIPacket *packet = const_cast<MIDIPacket *>(packet_list->packet);
	for (UInt32 i = 0; i < packet_list->numPackets; i++) {
		receive_input_packet(packet->timeStamp, packet->data, packet->length);
		packet = MIDIPacketNext(packet);
	}
}

Error MIDIDriverCoreMidi::open() {
	CFStringRef name = CFStringCreateWithCString(nullptr, "Godot", kCFStringEncodingASCII);
	OSStatus result = MIDIClientCreate(name, nullptr, nullptr, &client);
	CFRelease(name);
	if (result != noErr) {
		ERR_PRINT("MIDIClientCreate failed, code: " + itos(result));
		return ERR_CANT_OPEN;
	}

	result = MIDIInputPortCreate(client, CFSTR("Godot Input"), MIDIDriverCoreMidi::read, (void *)this, &port_in);
	if (result != noErr) {
		ERR_PRINT("MIDIInputPortCreate failed, code: " + itos(result));
		return ERR_CANT_OPEN;
	}

	int sources = MIDIGetNumberOfSources();
	for (int i = 0; i < sources; i++) {
		MIDIEndpointRef source = MIDIGetSource(i);
		if (source) {
			MIDIPortConnectSource(port_in, source, (void *)this);
			connected_sources.insert(i, source);
		}
	}

	return OK;
}

void MIDIDriverCoreMidi::close() {
	for (int i = 0; i < connected_sources.size(); i++) {
		MIDIEndpointRef source = connected_sources[i];
		MIDIPortDisconnectSource(port_in, source);
	}
	connected_sources.clear();

	if (port_in != 0) {
		MIDIPortDispose(port_in);
		port_in = 0;
	}

	if (client != 0) {
		MIDIClientDispose(client);
		client = 0;
	}
}

PackedStringArray MIDIDriverCoreMidi::get_connected_inputs() {
	PackedStringArray list;

	for (int i = 0; i < connected_sources.size(); i++) {
		MIDIEndpointRef source = connected_sources[i];
		CFStringRef ref = nullptr;
		char name[256];

		MIDIObjectGetStringProperty(source, kMIDIPropertyDisplayName, &ref);
		CFStringGetCString(ref, name, sizeof(name), kCFStringEncodingUTF8);
		CFRelease(ref);

		list.push_back(name);
	}

	return list;
}

MIDIDriverCoreMidi::MIDIDriverCoreMidi() {}

MIDIDriverCoreMidi::~MIDIDriverCoreMidi() {
	close();
}

#endif // COREMIDI_ENABLED