coremidi

问题 I'm missing something here, but I'm not sure how to fix it. The first version of this works: - (void) sendBytes:(const UInt8*)bytes size:(UInt32)size { Byte packetBuffer[size+100]; MIDIPacketList *packetList = (MIDIPacketList*)packetBuffer; MIDIPacket *packet = MIDIPacketListInit(packetList); MIDIPacketListAdd(packetList, sizeof(packetBuffer), packet, 0, size, bytes); [self sendPacketList:packetList]; } For DRYness, I try to make a method out of the packet list creation: - (MIDIPacketList*)

问题 This question already has an answer here : Swift: Pass data to a closure that captures context (1 answer) Closed 2 years ago . I'm working on an application that utilises MIDI equipment. After some fooling around in a playground with CoreMIDI, I found how to get MIDI input signal, so I implemented this: func makeInputSource() { var midiClient : MIDIClientRef = 0 var inPort : MIDIPortRef = 0 MIDIClientCreate("WobClient" as CFString, nil, nil, &midiClient) MIDIInputPortCreate(midiClient,

问题 I am encountering very bad problem using Sierra + xcode 8 + iOS Simulator: I develop midi application, but now , when I start the iOS Simulator I get no midi-port available, I mean: Usualle using Studio Midi is possible to see the virtual iOS device, plus you can see se the session, typically named Session 1. being this is possible to re-route the MidiNetwork ( midi_driver ) to a physical port, but now, using Sierra the iOS Simulatore is not visible no longer, and I do not know ( and where to

问题 I am able to create a midiclient via MIDIClientCreate when the scheme is a 64 bit processor (iPhone 5 and later). It does not work for 32 bit processors e.g. iPhone 4s. #if !arch(arm64) || !arch(x86_64) var status = OSStatus(noErr) var s:CFString = "MyClient" var client : Unmanaged<MIDIClient>? status = MIDIClientCreate(s, MIDINotifyProc( COpaquePointer( [ MyMIDINotifyProc ] ) ), nil, &client) if status == OSStatus(noErr) { if let c = client { var val = c.takeRetainedValue() Blammo. Bad

问题 I am looking at some of the examples of midi output using core midi. Specifically this question and this I have code that works based on these in objC and I now want to try to translate that to swift. the line I least understand is this one: MIDIPacketList* pktList = (MIDIPacketList*) pktBuffer; I read this as declaring a pointer pktlist of type MIDIPacketList and assigning it the value of pktBuffer, cast to the type MIDIPacketList I'm new to C and objC and this makes no sense to me.

问题 I am struggling to initialize the MIDIMetaEvent structure found in MusicPlayer.h with swift The header file defines the structure as follows: struct MIDIMetaEvent { var metaEventType: UInt8 var unused1: UInt8 var unused2: UInt8 var unused3: UInt8 var dataLength: UInt32 var data: (UInt8) } Which seems fairly straightforward up until that 'data' member. Is that a 1 element tuple definition? I can easily initialize all other struct elements but have tried in vain to set 'data' to anything else

问题 I have been unable to find much information on CoreMIDI for iOS. Is it even possible to play a MIDI sound by sending a message to the device itself. Does the iPhone or iPad have a MIDI device installed or do you have to have a device connected to interface with? 回答1: You should give a look at pete goodliffe's blog and he generously provides an example project. It helped me a lot to start programming CoreMIDI. Now about your questions, on iOS, mostly CoreMIDI network sessions are used. The

问题 It may be that this is actually not possible currently, which would be unfortunate. I'm trying to call the CoreMIDI API to set up a MIDI input. This is what I'm trying to do in Swift: var midiClient = MIDIClientRef() var inputPort = MIDIEndpointRef() var status: OSStatus func readProc(packetList: UnsafePointer<MIDIPacketList>, readProcRefCon: UnsafeMutablePointer<Void>, srcConnRefCon: UnsafeMutablePointer<Void>) -> Void { } status = MIDIClientCreate("MIDI client", nil, nil, &midiClient);

问题 I'm sending a string of MIDI packets using MIDIPacketListAdd. I want to change the packets dynamically during playback, so I'm using a NSTimer to add each packet before the scheduled time the packet should go out. The code works perfectly, the address of the current packet is updated correctly, I have verified that all the data is correct. However, no MIDI data is being sent when MIDIPacketListAdd is called from the timer. I add the first two packets before starting the timer to make sure

问题 I'm trying to get MIDI sessions working with swift code and am running into issues with some of the delegates. This is a working example in Objective-C . OSStatus status = MIDIClientCreate(CFSTR("MIDI Client"), MIDIStateChangedHandler, nil, &client); void MIDIStateChangedHandler(const MIDINotification *message, void *refCon) { NSLog(@"MIDIStateChanged!"); } This is what I'm trying with Swift : var status = MIDIClientCreate("the client", notifyProc: MIDIStateChangedHandler, notifyRefCon: nil,