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