ample/Ample/MidiManager.m
2021-08-07 15:12:45 -04:00

154 lines
4.1 KiB
Objective-C

//
// Midi.m
// Ample
//
// Created by Kelvin Sherlock on 8/6/2021.
// Copyright © 2021 Kelvin Sherlock. All rights reserved.
//
#import <Foundation/Foundation.h>
#import <CoreMIDI/CoreMIDI.h>
#import "MidiManager.h"
static NSArray *MidiSources(void) {
ItemCount count = MIDIGetNumberOfSources();
if (count <= 0) return @[];
NSMutableArray *rv = [NSMutableArray arrayWithCapacity: count + 1];
MIDIEndpointRef ep;
for(int i = 0; i < count; ++i) {
ep = MIDIGetSource(i);
if (!ep) continue;
// https://developer.apple.com/library/archive/qa/qa1374/_index.html
CFStringRef str = NULL;
MIDIObjectGetStringProperty(ep, kMIDIPropertyDisplayName, &str);
if (str) {
[rv addObject: (__bridge id _Nonnull)(str)];
CFRelease(str);
}
}
return rv;
}
static NSArray *MidiDestinations(void) {
ItemCount count = MIDIGetNumberOfDestinations();
if (count <= 0) return @[];
NSMutableArray *rv = [NSMutableArray arrayWithCapacity: count + 1];
MIDIEndpointRef ep;
for(int i = 0; i < count; ++i) {
ep = MIDIGetDestination(i);
if (!ep) continue;
// https://developer.apple.com/library/archive/qa/qa1374/_index.html
CFStringRef str = NULL;
MIDIObjectGetStringProperty(ep, kMIDIPropertyDisplayName, &str);
if (str) {
[rv addObject: (__bridge id _Nonnull)(str)];
CFRelease(str);
}
}
return rv;
}
NSString *kMidiSourcesChangedNotification = @"Midi Sources Changed";
NSString *kMidiDestinationsChangedNotification = @"Midi Destinations Changed";
@interface MidiManager () {
MIDIClientRef _client;
}
-(void)objectAddRemove: (const MIDIObjectAddRemoveNotification *)message;
-(void)objectPropertyChanged: (const MIDIObjectPropertyChangeNotification *)message;
@end
static MidiManager *singleton = nil;
@implementation MidiManager
-(void)awakeFromNib {
if (!singleton) singleton = self;
}
+(instancetype)sharedManager {
if (!singleton) singleton = [MidiManager new];
return singleton;
}
-(instancetype)init {
if (singleton) return singleton;
OSStatus status;
status = MIDIClientCreateWithBlock(
CFSTR("serial_midi"),
&_client,
^(const MIDINotification *message){
switch(message->messageID) {
case kMIDIMsgObjectAdded:
case kMIDIMsgObjectRemoved:
[self objectAddRemove: (const MIDIObjectAddRemoveNotification *)message];
break;
case kMIDIMsgPropertyChanged:
[self objectPropertyChanged: (const MIDIObjectPropertyChangeNotification *)message];
default:
break;
}
});
_sources = MidiSources();
_destinations = MidiDestinations();
return self;
}
-(void)objectAddRemove: (const MIDIObjectAddRemoveNotification *)message {
const MIDIObjectAddRemoveNotification *m = (const MIDIObjectAddRemoveNotification *)message;
NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
if (m->childType == kMIDIObjectType_Source) {
[self setSources: MidiSources()];
[nc postNotificationName: kMidiSourcesChangedNotification object: self];
}
if (m->childType == kMIDIObjectType_Destination) {
[self setDestinations: MidiDestinations()];
[nc postNotificationName: kMidiDestinationsChangedNotification object: self];
}
}
-(void)objectPropertyChanged: (const MIDIObjectPropertyChangeNotification *)message {
const MIDIObjectPropertyChangeNotification *m = (const MIDIObjectPropertyChangeNotification *)message;
if (m->propertyName == kMIDIPropertyDisplayName) {
[self setSources: MidiSources()];
[self setDestinations: MidiDestinations()];
NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
[nc postNotificationName: kMidiSourcesChangedNotification object: self];
[nc postNotificationName: kMidiDestinationsChangedNotification object: self];
}
}
-(void)dealloc {
if (_client)
MIDIClientDispose(_client);
}
@end