BLE MIDI I/O – DECODE X NET

iOSのBLE通信によるMIDI I/Fを使って実際に音源を鳴らすテストをしてみました。
BLEはこれまでもいろいろなデバイスでテストをしてきましたが、PGMIDIというライブラリとその実装が下記サイトにあり、とてもわかりやすかったため参考にさせていただきました。

参考) https://github.com/JunichiMinamino/BleMidiTest
https://github.com/JunichiMinamino/BleMidiTest/blob/main/BleMidiTest/ViewController.m

上記ViewControllerでは、UIをコードで書いているところをInterfaceBuilderに置き換えて、私がテストしたい必要最低限のところのみ実装しました。
Delegate以下はそのまま使わせていただきました。
実は手持ちのドラム音源Roland TD-17に直接接続したかったのですが、BLEでは接続できないようなので、YAMAHA UD-BT01にUSB-MIDIを接続してテストしました。
やりたいことは、TD-17のSD,BDの音をiPhoneから鳴らすことと、パッドを叩くとそのノート情報を受信することです。

メイン画面をナビゲータ画面の一つとしておくと、CABTMIDICentralViewControllerを呼び出すだけで、BLE接続に関する処理を全てやってくれます。(とても便利!)
ここでは、セントラルによる接続のみにしました。

#import <CoreAudioKit/CoreAudioKit.h>
#import "MidiViewController.h"
#import "PGMidi.h"

@interface MidiViewController () <PGMidiDelegate, PGMidiSourceDelegate>
{
    PGMidi *_midi;
    __weak IBOutlet UILabel *_labelCount;
    __weak IBOutlet UILabel *_labelReceive;
}
@end

@implementation MidiViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
        self.title = @"MidiView";
    }
    return self;
}
- (void)viewDidLoad {
    [super viewDidLoad];
    _midi = [[PGMidi alloc] init];
    _midi.networkEnabled = YES;
    _midi.delegate = self;
    for (PGMidiSource *source in _midi.sources) {
        [source addDelegate:self];
    }
    _midi.virtualDestinationEnabled = YES;
    _midi.virtualSourceEnabled = YES;
}
- (IBAction)btnConnect:(UIButton *)sender {
    CABTMIDICentralViewController *pCentralVC = [[CABTMIDICentralViewController alloc] init];
    [self.navigationController pushViewController:pCentralVC animated:YES];
}
- (IBAction)btnDownSD:(UIButton *)sender {
    const UInt8 noteOn[] = {0x99, 38, 127};
    [_midi sendBytes:noteOn size:sizeof(noteOn)];
}
- (IBAction)btnUpSD:(UIButton *)sender {
    const UInt8 noteOff[] = {0x89, 38, 0};
    [_midi sendBytes:noteOff size:sizeof(noteOff)];
}
- (IBAction)btnDownBD:(UIButton *)sender {
    const UInt8 noteOn[] = {0x99, 36, 127};
    [_midi sendBytes:noteOn size:sizeof(noteOn)];
}
- (IBAction)btnUpBD:(UIButton *)sender {
    const UInt8 noteOff[] = {0x89, 36, 0};
    [_midi sendBytes:noteOff size:sizeof(noteOff)];
}

#pragma mark - PGMidiDelegate
- (void)midi:(PGMidi *)midi sourceAdded:(PGMidiSource *)source
{
    [source addDelegate:self];
    [self updateCountLabel];
    [self updateReceiveLabel:[NSString stringWithFormat:@"Source added: %@", ToString(source)]];
}
- (void)midi:(PGMidi *)midi sourceRemoved:(PGMidiSource *)source
{
    [self updateCountLabel];
    [self updateReceiveLabel:[NSString stringWithFormat:@"Source removed: %@", ToString(source)]];
}
// Connect USB keyboard
- (void)midi:(PGMidi *)midi destinationAdded:(PGMidiDestination *)destination
{
    [self updateCountLabel];
    [self updateReceiveLabel:[NSString stringWithFormat:@"Desintation added: %@", ToString(destination)]];
}
- (void)midi:(PGMidi *)midi destinationRemoved:(PGMidiDestination *)destination
{
    [self updateCountLabel];
    [self updateReceiveLabel:[NSString stringWithFormat:@"Desintation removed: %@", ToString(destination)]];
}
- (void)updateReceiveLabel:(NSString *)string
{
    _labelReceive.text = string;
    NSLog(@"%@", string);
}
- (void)updateCountLabel
{
    NSString *strCount = [NSString stringWithFormat:@"sources=%u destinations=%u", (unsigned)_midi.sources.count, (unsigned)_midi.destinations.count];
    _labelCount.text = strCount;
    NSLog(@"%@", strCount);
}
const char *isToString(BOOL b)
{
    return b ? "yes":"no";
}
NSString *ToString(PGMidiConnection *connection)
{
    return [NSString stringWithFormat:@"< PGMidiConnection: name=%@ isNetwork=%s >", connection.name, isToString(connection.isNetworkSession)];
}
#pragma mark - PGMidiSourceDelegate
- (void)callMIDIPacket:(NSInteger)iIndex packet:(const MIDIPacket *)packet
{
    Byte bNoteOn = 0x9;
    Byte bNoteOff = 0x8;
    
    if (packet->data[0] >> 4 == bNoteOn) {
        [self updateReceiveLabel:[NSString stringWithFormat:@"NoteOn: %d %d %d", packet->data[0], packet->data[1], packet->data[2]]];
        
    } else if (packet->data[0] >> 4 == bNoteOff) {
        [self updateReceiveLabel:[NSString stringWithFormat:@"NoteOff: %d %d %d", packet->data[0], packet->data[1], packet->data[2]]];
    }
}
- (void)midiSource:(PGMidiSource *)midi midiReceived:(const MIDIPacketList *)packetList
{
    const MIDIPacket *packet = &packetList->packet[0];
    for (int i = 0; i < packetList->numPackets; ++i) {
        dispatch_async(dispatch_get_main_queue(), ^{
            [self callMIDIPacket:i packet:packet];
        });
        packet = MIDIPacketNext(packet);
    }
}
@end

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#import <CoreAudioKit/CoreAudioKit.h>

#import "MidiViewController.h"

#import "PGMidi.h"

@interface MidiViewController () <PGMidiDelegate, PGMidiSourceDelegate>

{

PGMidi *_midi;

__weak IBOutlet UILabel *_labelCount;

__weak IBOutlet UILabel *_labelReceive;

}

@end

@implementation MidiViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {

if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {

self.title = @"MidiView";

}

return self;

}

- (void)viewDidLoad {

[super viewDidLoad];

_midi = [[PGMidi alloc] init];

_midi.networkEnabled = YES;

_midi.delegate = self;

for (PGMidiSource *source in _midi.sources) {

[source addDelegate:self];

}

_midi.virtualDestinationEnabled = YES;

_midi.virtualSourceEnabled = YES;

}

- (IBAction)btnConnect:(UIButton *)sender {

CABTMIDICentralViewController *pCentralVC = [[CABTMIDICentralViewController alloc] init];

[self.navigationController pushViewController:pCentralVC animated:YES];

}

- (IBAction)btnDownSD:(UIButton *)sender {

const UInt8 noteOn[] = {0x99, 38, 127};

[_midi sendBytes:noteOn size:sizeof(noteOn)];

}

- (IBAction)btnUpSD:(UIButton *)sender {

const UInt8 noteOff[] = {0x89, 38, 0};

[_midi sendBytes:noteOff size:sizeof(noteOff)];

}

- (IBAction)btnDownBD:(UIButton *)sender {

const UInt8 noteOn[] = {0x99, 36, 127};

[_midi sendBytes:noteOn size:sizeof(noteOn)];

}

- (IBAction)btnUpBD:(UIButton *)sender {

const UInt8 noteOff[] = {0x89, 36, 0};

[_midi sendBytes:noteOff size:sizeof(noteOff)];

}

#pragma mark - PGMidiDelegate

- (void)midi:(PGMidi *)midi sourceAdded:(PGMidiSource *)source

{

[source addDelegate:self];

[self updateCountLabel];

[self updateReceiveLabel:[NSString stringWithFormat:@"Source added: %@", ToString(source)]];

}

- (void)midi:(PGMidi *)midi sourceRemoved:(PGMidiSource *)source

{

[self updateCountLabel];

[self updateReceiveLabel:[NSString stringWithFormat:@"Source removed: %@", ToString(source)]];

}

// Connect USB keyboard

- (void)midi:(PGMidi *)midi destinationAdded:(PGMidiDestination *)destination

{

[self updateCountLabel];

[self updateReceiveLabel:[NSString stringWithFormat:@"Desintation added: %@", ToString(destination)]];

}

- (void)midi:(PGMidi *)midi destinationRemoved:(PGMidiDestination *)destination

{

[self updateCountLabel];

[self updateReceiveLabel:[NSString stringWithFormat:@"Desintation removed: %@", ToString(destination)]];

}

- (void)updateReceiveLabel:(NSString *)string

{

_labelReceive.text = string;

NSLog(@"%@", string);

}

- (void)updateCountLabel

{

NSString *strCount = [NSString stringWithFormat:@"sources=%u destinations=%u", (unsigned)_midi.sources.count, (unsigned)_midi.destinations.count];

_labelCount.text = strCount;

NSLog(@"%@", strCount);

}

const char *isToString(BOOL b)

{

return b ? "yes":"no";

}

NSString *ToString(PGMidiConnection *connection)

{

return [NSString stringWithFormat:@"< PGMidiConnection: name=%@ isNetwork=%s >", connection.name, isToString(connection.isNetworkSession)];

}

#pragma mark - PGMidiSourceDelegate

- (void)callMIDIPacket:(NSInteger)iIndex packet:(const MIDIPacket *)packet

{

Byte bNoteOn = 0x9;

Byte bNoteOff = 0x8;

if (packet->data[0] >> 4 == bNoteOn) {

[self updateReceiveLabel:[NSString stringWithFormat:@"NoteOn: %d %d %d", packet->data[0], packet->data[1], packet->data[2]]];

} else if (packet->data[0] >> 4 == bNoteOff) {

[self updateReceiveLabel:[NSString stringWithFormat:@"NoteOff: %d %d %d", packet->data[0], packet->data[1], packet->data[2]]];

}

- (void)midiSource:(PGMidiSource *)midi midiReceived:(const MIDIPacketList *)packetList

{

const MIDIPacket *packet = &packetList->packet[0];

for (int i = 0; i < packetList->numPackets; ++i) {

dispatch_async(dispatch_get_main_queue(), ^{

[self callMIDIPacket:i packet:packet];

});

packet = MIDIPacketNext(packet);

}

@end

環境) iPhone6 / Build Target iOS 9.2 / Xcode 13.2.1 / macOS Big Sur 11.6.2
BLE-MIDIはデバイスによって(Linux,Windows,Macとか、BluetoohのバージョンにもよるのでそのPCの年代にもよる。また今回のようにUSB-MIDIを使うときはホスト側かデバイス側か、とかも考慮)接続ができなかったりすることが多く、実際に使いたい組み合わせで動作するときは、それをメモっておきたくなります。(In/Out両方同時に使えない楽器もあった)
今回のテストも、その一つでした。