As the summer continues, I have been diving deeper and deeper into MusicKit, largely with great results. A few issues have arisen that I've outlined here, feedbacks already filed and numbers included here. All of this happens on the lasted developer beta and latest Xcode beta. Thanks! FB10967343 - Setting the queue with library and non-library items at the same time doesn't work correctly In my app, I am working on a feature that lets a user shuffle songs from a collection of albums that may or may not be in their library. However, I’ve discovered an issue where the queue does not seem to work correctly when mixing these types. I’ve attempted to load ApplicationMusicPlayer by creating a Queue and to load applicationQueuePlayer using a MPMusicPlayerPlayParametersQueueDescriptor, but the same issue occurs each time. The queue is able to play songs from the same source, but if it’s been playing a library song and tries to move to a non-library song, the queue stops.  The first thing I do is pick random songs from each album, using a MusicLibraryRequest or a MusicCatalogResourceRequest as appropriate, then taking a randomElement() from the ensuing MusicItemCollection for the album.  I append each track to an array, which I then cast to MusicItemCollection so I’ve now got a MusicItemCollection consisting of the tracks I want. If I’m in MusicKit land, I simply set the queue as follows:  player.queue = ApplicationMusicPlayer.Queue(for: tracks) It takes a bit more doing in MediaPlayer, but in theory this should also work, right?    do {         let paramObjects = tracks.compactMap {             $0.playParameters         }         let params = try paramObjects.map({try JSONEncoder().encode($0)}) let dicts = try params.compactMap {               try JSONSerialization.jsonObject(with: $0, options: []) as? [String:Any]           }           let finalParams = dicts.compactMap {                 MPMusicPlayerPlayParameters(dictionary: $0)             } let descriptor = MPMusicPlayerPlayParametersQueueDescriptor(playParametersQueue: finalParams) mediaPlayer.setQueue(with: descriptor) } catch { print(error) } In either case, the following issue occurs: say that I end up with a queue made up of one library song, then one non-library song. The player will play just the first song, then it acts as if the queue has ended. Say that it has two non-library songs, then one library song. Just the two non-library songs play. Indeed, printing queue.entries shows just the number of items that were from the same source type. FB10967076 - Publishing changes from background thread error when inserting queue items When using the .insert method on ApplicationMusicPlayer.Queue on the last iOS 16 and Xcode betas, it returns a “Publishing changes from background thread” error even though the function I’m doing in is marked as a @MainActor and the stacktace indicates it was on the main thread. FB10967277 - song.with([.albums], preferredSource: .library) generates thousands of lines of EntityQueries in the console I’ve noticed that when using the preferredSource: .library when requesting additional properties on a library item creates ~6,000 of “EntityQuery” entries in the console, all in the span of a second. This doesn’t seem to be leading to any major performance issues, but it sure seems like something isn't right. let request = MusicLibraryRequest<Song>.init() do { let response = try await request.response() guard let song = response.items.first else { return } let songWithAlbums = try await song.with([.albums], preferredSource: .library) } catch { print(error) } generates the following output (except... 6,000 of them) 2022-07-31 13:02:07.729003-0400 MusicKitFutzing[9405:2192606] [EntityQuery] Finished fetching results in 0s 2022-07-31 13:02:07.729047-0400 MusicKitFutzing[9405:2192605] [EntityQuery] Finished executing query in 0.00100017s 2022-07-31 13:02:07.729202-0400 MusicKitFutzing[9405:2192611] [EntityQuery] Finished executing query in 0s 2022-07-31 13:02:07.729240-0400 MusicKitFutzing[9405:2192605] [EntityQuery] Finished fetching results in 0s

Hi, Is it possible to get the various audio variants for a given song ID, I am unable to find any documentation for this online. In particular, could I see if Dolby Atmos is available for the track? Here is an example of a request I am sending: https://api.music.apple.com/v1/catalog/us/songs/1168770969

I have an IOSurface and I want to turn that into a CIImage. However, the constructor of CIImage takes a IOSurfaceRef instead of a IOSurface. On most platforms, this is not an issue because the two types are toll-free bridgeable... except for Mac Catalyst, where this fails. I observed the same back in Xcode 13 on macOS. But there I could force-cast the IOSurface to a IOSurfaceRef: let image = CIImage(ioSurface: surface as! IOSurfaceRef) This cast fails at runtime on Catalyst. I found that unsafeBitCast(surface, to: IOSurfaceRef.self) actually works on Catalyst, but it feels very wrong. Am I missing something? Why aren't the types bridgeable on Catalyst? Also, there should ideally be an init for CIImage that takes an IOSurface instead of a ref.

How to add multiple resolutions to CMIO camera extension

I am looking to do the OOB (Out of band) pairing using QR code with a device from iOS app. I referred the documentation but could not find if this is feasible or not. Few forum says it is not feasible, few says it is. May I know the latest state from Apple development support team?

Hello Apple, I am concerned about the new iOS Screen Mirroring that is available on iOS. I have an app that is only meant to be viewed on iPhones (not Macs or Computers, due to security reasons. I am assuming that Screen Mirroring is using AirPlay underneath, otherwise is there an API being planned or coming that can disable this functionality or is there a way for my app to opt out out of iOS Screen Mirroring? Thanks.

Hello everyone, I am thrilled about the iPhone Mirroring demo on WWDC24 and I have a few thoughts to share. Will it work through a local network, or can the iPhone be accessed within a global network? Will there be an API to initiate iPhone mirroring via an app? This would be a great feature for MDMs, allowing administrators to provide support for their users. Could you share more details from the development perspective?

Hi everyone, I'm currently developing an iOS app using React Native and recently got accepted into the Apple Music Global Affiliate Program. To fully utilize this opportunity, I need to implement the following functionalities: Authorize Apple Music usage Play Apple Music within my app Identify if a user has an Apple Music subscription Initiate and complete Apple Music subscription within my app I've successfully implemented the first three functionalities using the react-native-apple-music module. Now, I need your help to understand how I can directly trigger the Apple Music subscription process from within my app. Thank you for your help!

Hello, this is building off of another post in which several other posters and I had already attempted solving the issue in hacky ways. I am using MPMusicPlayerController.applicationQueuePlayer. My end goal here is to dynamically add items to the queue when it has ended based on my application's business logic. There is no way for me to know what these items will be when I am initially setting the queue. I have an updated implementation that seems to cover most edge cases, except for a glaringly obvious one – if there is just one item in the queue, and the user skips the track via MPRemoteCommandCenter (eg. lock screen), then it does not work. Currently, when I receive a MPMusicPlayerControllerPlaybackStateDidChange notification, I run this block: if player.playbackState == .paused,            player.currentPlaybackTime == 0,            player.indexOfNowPlayingItem == 0 {             EndOfQueueManager.handle()         } In the absence of a mechanism to detect the end of the queue from the framework, I would love to add the ability to add a target to MPRemoteCommand, like you can do for AVPlayer. I have tried to do exactly that, but it does not work: MPRemoteCommandCenter.shared().nextTrackCommand.addTarget { (event) -> MPRemoteCommandHandlerStatus in         if queue.count == 1 {             EndOfQueueManager.handle() }         return .success } I already have a functioning AVPlayer implementation that achieves my goal without any compromises or edge cases. I would be very disappointed if there is no way to do this with MPMusicPlayerController – being notified about the queue ending feels like a fairly rudimentary API hook.

Hello, I am wondering how one can play music videos (with the actual video playing) with the ApplicationMusicPlayer using MusicKit for Swift? There is not much documentation on this, so any help would be appreciated.

I'm working on a macOS application that captures audio and video. When the user selects a video capture source (most likely an elgato box), I would like the application to automatically select the audio input from the same device. I was achieving this by pairing video and audio sources that had the same name, but this doesn't work when the user plugs in two capture devices of the same make and model. With the command system_profiler SPUSBDataType I can list all the USB devices, and I can see that the two elgato boxes have different serial numbers. If I could find this serial number, then I could figure out which AVCaptureDevices come from the same hardware. Is there a way to get the manufacturer's serial number from the AVCaptureDevice object? Or a way to identify the USB device for an AVCaptureDevice, and from there I could get the serial or some other unique ID?

Hello, currently working on a shareplay feature that allows users to pull 3d models from icloud and view it via volumes/immersive space on the vision pro. Was able to get the sharing working with multiple windows recently so now all that's left is to be able to sync/share the model in the SharePlay session. As I understand it, we should generally use GroupSessionMessenger for commands and light data like model positioning/syncing properties. Whereas for bigger pieces of data (images/videos/models), we should send these through GroupSessionJournal which the group session manages and syncs it for all users in the call. I have a button to get the current user's model data and add it to the journal via /// modelData is type `Data` try await journal.add(modelData) I have also set up a task to observe/receive updates to the journal's attachments in when receiving a group session. for await groupSession in MyModelActivity.sessions() { ... tasks.insert { Task { for await attachments in journal.attachments { for attachment in attachments { do { let modelData = try await attachment.load(Data.self) // throws error here - `notSupported` let modelUrl = writeModelDataToTempDirectory(modelData: modelData) self.modelUrlToLoadForGroupSession = modelUrl } catch let error { print("Error: \(error)") } } } } } } Not quite sure why I'm running into an error being thrown when attempting to load the attachment data on the other devices, any thoughts? The documentation for add(_:) and load(_:) say that the attachment should conform to Transferable but Data.Type should already conform to Transferable

Hello, We've a music app reading MPMediaItem. We got items using MPMediaQuery. But we realized that some downloaded tracks from Apple Music were fetched too. Not all downloaded track but only those who were played recently. Of course, since these tracks are protected with DRM we can't play them in our player. It's weird to get them in our query because we added predicate in order to dont fetch protected asset and iCloud item MPMediaPropertyPredicate(value: false, forProperty: MPMediaItemPropertyHasProtectedAsset) MPMediaPropertyPredicate(value: false, forProperty: MPMediaItemPropertyIsCloudItem) To be sure, we made a second check on each item we've fetched extension MPMediaItem { public func isValid() -> Bool { return self.assetURL != nil && !self.isCloudItem && !self.hasProtectedAsset } } But we still get these items. Their hasProtectedAsset attribute always return false. I dont know if it's a bug, but since we can't detect this items as Apple Music downloaded track, we can't either: filter them to not add them in our application library OR switch on a MPMusicPlayerController.applicationMusicPlayer to allow the user to play them

We have an app with a broadcast extension with a RPBroadcastSampleHandler. The implementation is working fine, however for quite some users the extension suddenly crashes during the broadcast. The stacktrace stacktrace of the crashing thread always looks like the shortened sample below. (Full crash reports and stack traces are attached to the submitted Feedbacks.) Looking at the stacktrace none of our code is running, just ReplayKit code handling XPC messages at that moment: Thread: #0 0x00000001e2cf342c in __pthread_kill () #1 0x00000001f6a51c0c in pthread_kill () #2 0x00000001a1bfaba0 in abort () #3 0x00000001a9e38588 in malloc_vreport () #4 0x00000001a9e35430 in malloc_zone_error () [...] #18 0x0000000218ac91bc in -[RPBroadcastSampleHandler processPayload:completion:] () #19 0x0000000198b81360 in __NSXPCCONNECTION_IS_CALLING_OUT_TO_EXPORTED_OBJECT_S2__ () Is anyone aware of there issues with ReplayKit? Are there known workarounds? Could anything we're doing affect crashes like this? Would greatly appreciate it if anyone from Apple DTS could look into this and flag the below Feedbacks to the relevant teams! Feedback IDs: FB13949098, FB13949188

I'm using a UIImageView to display album artwork when playing music. Every time new artwork is loaded, the memory usage increases. I'm using ARC and tried a autoreleasepool around the code. If I put the app in the background, the cache clears and it starts using up memory again. Here's my code: - (void) showArtwork { @autoreleasepool { MPMediaItem *currentItem = [self.musicPlayer nowPlayingItem]; if (currentItem) { MPMediaItemArtwork *artwork = [currentItem valueForProperty: MPMediaItemPropertyArtwork]; if (artwork) { UIImage *artworkImage = [artwork imageWithSize: CGSizeMake (339, 339)]; if (artworkImage) { [self.appCoverArt setImage: artworkImage]; } } } } } musicPlayer is the systemMusicPlayer appCoverArt is my UIIMageView 1. Is there a way to release an image from UIImageView before assigning a new image? 2. Is there a way to clear the pool other than putting the app in the background (which does clear the memory)?

Hello there, I am faced with the following situation: We are building a web app that manages playlists for different platforms, including Apple music We have the concept of teams in there, where a user can be part of multiple teams, and teams are managed by team admin A team admin could manage multiple teams The problem here is, that a team admin wouldn't be able to sign in to the Apple music account for multiple teams because if using the same computer we try to let the user sign in once and store the Music User Token, we can't do another login unless we unauthorized the previous one. Is there anything we can do about this? Thanks

I would like to enable users of my iOS app to place an object they want to scan, for example, on a turntable, instead of walking around it, in order to generate a 3D model of it afterward. How can I achieve this with the Object Capture API?

Hi there, I ve Been wondering about getting a 'music user token' for manipulating users playlists. The situation I found myself in is that that can only be done in the front-end, but by exposing the 'developer token' I need to generate, and the 'developer token' is the key to our app, if someone takes that, they can do anything with it, am I wrong? Thanks for your time!

I'm very excited about the new MusicLibrary API, but after a couple of days of playing around with it, I have to say that I find the implementation of filtering MusicLibraryRequests a little confusing. MPMediaQuery has a fairly extensive list of predicates that can be applied, including string and persistentID comparisons for artist, album artist genre, and more. It also lets you filter on an item’s title. MusicLibraryRequests let you filter on the item’s ID, or on its MusicKit Artist and Genre relationships. To me, this seems like it adds an extra step.  With an MPMediaQuery, if I wanted to fetch every album by a given artist, I’d apply an MPMediaPropertyPredicate looking at MPMediaItemPropertyAlbumArtist and compare the string. It was also easy to change the MPMediaPredicateComparison to .contains to match more widely. If I wanted to surface albums by “Aesop Rock” or “Aesop Rock & Blockhead,” I could use that. In the MusicLibraryRequest implementation, it looks like I need to perform a MusicLibraryRequest<Artist> first in order to get the Artist objects. There’s no filter for the name property, so if I don’t have their IDs, I’ve got to use filter(text:). From there, I can take the results of that request and apply them to my MusicLibraryRequest<Album> using the filter(matching:memberOf) function.  I could use filter(text:) on the MusicLibraryRequest<Album>, but that filters across multiple properties (title and artistName?) and is less precise than defining the actual property I want to match against. I think my ideal version of the MusicLibraryRequest API would offer something like filter(matching:equalTo:) or filter(matching:contains:) that worked off of KeyPaths rather than relationships. That seems more intuitive to me. I’m not saying we need every property from every filterable MPMediaItemProperty key, but I’d love to be able to do it on title, artistName, and other common metadata. That might look something like: filter(matching: \.title, contains: “Abbey Road”) filter(matching: \.artistName, equalTo: “Between The Buried And Me”) I noticed that filter(text:) is case insensitive, which is awesome, and something I’ve wanted for a long time in MPMediaPropertyPredicate. As a bonus, it would be great if a KeyPath based filter API supported a case sensitivity flag. This is less of a problem when dealing with Apple Music catalog content, but users’ libraries are a harsh environment, and you might have an artist “Between The Buried And Me” and one called “Between the Buried and Me.” It would be great to get albums from both with something like: filter(matching: \.artistName, equalTo: “Between The Buried And Me”, caseSensitive: false)  I've submitted the above as FB10185685. I also submitted another feedback this morning regarding filter(text:) and repeating text as FB10184823. My last wishlist item for this API (for the time being!) is exposing the MPMediaItemPropertyAlbumPersistentID as an available filter attribute. I know, I know… hear me out. If you take a look at the other thread I made today, you’ll see that due to missing metadata in MusicKit, I still have some use cases where I need to be able to reference an MPMediaItem and might need to fetch its containing MPMediaItemCollection to get at other tracks on the album. It would be nice to seamlessly be able to fetch the MPMediaItemCollection or the library Album using a shared identifier, especially when it comes to being able to play the album in MusicKit’s player rather than Media Player’s.  I've submitted that list bit as FB10185789 Thanks for bearing with my walls of text today. Keep up the great work!

Running in a Mac (Catalyst) target or Apple Silicon (designed for iPad). Just accessing the playbackStoreID from the MPMediaItem shows this error in the console: -[ITMediaItem valueForMPMediaEntityProperty:]: Unhandled MPMediaEntityProperty subscriptionStoreItemAdamID. The value returned is always “”. This works as expected on iOS and iPadOS, returning a valid playbackStoreID. import SwiftUI import MediaPlayer @main struct PSIDDemoApp: App { var body: some Scene { WindowGroup { Text("playbackStoreID demo") .task { let authResult = await MPMediaLibrary.requestAuthorization() if authResult == .authorized { if let item = MPMediaQuery.songs().items?.first { let persistentID = item.persistentID let playbackStoreID = item.playbackStoreID // <--- Here print("Item \(persistentID), \(playbackStoreID)") } } } } } } Xcode 15.1, also tested with Xcode 15.3 beta 2. MacOS Sonoma 14.3.1 FB13607631