Hi, In my app I am using MusicLibraryRequest<Artist> to fetch all of the artists in someone's Library collection. With this response I then fetch each artists albums: artist.with([.album]). The response from this only gives albums in the users Library collection. I would like to augment it with all of the albums for an artist from the full catalogue. I'm using MusicKit and targeting iOS18 and visionOS 2. Could someone please point me towards the best way to approach this?

Hi, I recently updated to ios 18. And yes the music is playing in background with camera app. But unable to play music with notes app open

Hello, I'm getting an unknown, never-before-seen error at application launch, when running my iOS SpriteKit game on the iOS 18 arm64 simulator from Xcode 16.0 (16A242d) — AudioConverterOOP.cpp:847 Failed to prepare AudioConverterService: -302 This is occurs on all iOS 18 simulator devices, between application(_:didFinishLaunchingWithOptions:) and the first applicationDidBecomeActive(_:) — the SKScene object may have been already initialized by SpriteKit, but the scene's didMove(to:) method hasn't been called yet. Also, note that the error message is being emitted from a secondary (non-main) thread, obviously not created by the app. After the error occurs, no SKScene is able to play audio — this had never occurred on iOS versions prior to 18, neither on physical devices nor on the simulator. Has anyone seen anything like this on a physical device running 18? Unfortunately, at the moment I cannot test myself on an 18 device, only on the simulator... Thank you, D.

I have a text-to-speech app that generates speech using non-Apple technology. My users are requesting to use it for phone and FaceTime calls. Is there any way I can play generated audio through a phone or FaceTime call?

Hello! I’m making an app which will have a waveform of the frequency of what’s playing on a Mac. The question is whether it is possible to have access to the signal of the media and use it with the FFT?

Hello everyone, I'm new to Core Audio and still haven't found my footing. I'm learning how to capture audio from the default device, using Audio Units. On my MacBook, the default audio input is mono. But when I write a piece of code to capture audio using AUHAL, I'm discovering that I need to provide an AudioBufferList with two channels, not one. Also, when I try to capture audio from an audio interface with 20 audio inputs, I must provide an AudioBufferList with two channels, and not with 20 channels. To investigate the issue, I wrote a small diagnostic program, which opens the default audio device and probes it for the number of channels. Depending on which way I'm probing, I'm getting different results. When I probe the stream format, I'm getting information that there is 1 channels. But when I probe the input audio unit, I'm getting information that there are 2 input channels. Here's my program to demonstrate the issue: // InputDeviceChannels.m // Compile with: // clang -framework CoreAudio -framework AudioToolbox -framework CoreFoundation -framework AudioUnit -o InputDeviceChannels InputDeviceChannels.m // // On my system, this prints: // Device Name: MacBook Pro Microphone // Number of Channels (Stream Format): 1 // Number of Elements (Element Count): 2 #import <AudioToolbox/AudioToolbox.h> #import <AudioUnit/AudioUnit.h> #import <CoreAudio/CoreAudio.h> #import <Foundation/Foundation.h> void printDeviceInfo(AudioUnit audioUnit) { UInt32 size; OSStatus err; AudioStreamBasicDescription streamFormat; size = sizeof(streamFormat); err = AudioUnitGetProperty(audioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 1, &streamFormat, &size); if (err != noErr) { printf("Error getting stream format\n"); exit(1); } int numChannels = streamFormat.mChannelsPerFrame; UInt32 elementCount; size = sizeof(elementCount); err = AudioUnitGetProperty(audioUnit, kAudioUnitProperty_ElementCount, kAudioUnitScope_Input, 0, &elementCount, &size); if (err != noErr) { printf("Error getting element count\n"); exit(1); } printf("Number of Channels (Stream Format): %d\n", numChannels); printf("Number of Elements (Element Count): %d\n", elementCount); } void printDeviceName(AudioDeviceID deviceID) { UInt32 size; OSStatus err; CFStringRef deviceName = NULL; size = sizeof(deviceName); err = AudioObjectGetPropertyData( deviceID, &(AudioObjectPropertyAddress){kAudioDevicePropertyDeviceNameCFString, kAudioObjectPropertyScopeGlobal, kAudioObjectPropertyElementMain}, 0, NULL, &size, &deviceName); if (err != noErr) { printf("Error getting device name\n"); exit(1); } char deviceNameStr[256]; if (!CFStringGetCString(deviceName, deviceNameStr, sizeof(deviceNameStr), kCFStringEncodingUTF8)) { printf("Error converting device name to C string\n"); exit(1); } CFRelease(deviceName); printf("Device Name: %s\n", deviceNameStr); } int main(int argc, const char *argv[]) { @autoreleasepool { OSStatus err; // Get the default input device ID AudioDeviceID input_device_id = kAudioObjectUnknown; { UInt32 property_size = sizeof(input_device_id); AudioObjectPropertyAddress input_device_property = { kAudioHardwarePropertyDefaultInputDevice, kAudioObjectPropertyScopeGlobal, kAudioObjectPropertyElementMain, }; err = AudioObjectGetPropertyData(kAudioObjectSystemObject, &input_device_property, 0, NULL, &property_size, &input_device_id); if (err != noErr || input_device_id == kAudioObjectUnknown) { printf("Error getting default input device ID\n"); exit(1); } } // Print the device name using the input device ID printDeviceName(input_device_id); // Open audio unit for the input device AudioComponentDescription desc = {kAudioUnitType_Output, kAudioUnitSubType_HALOutput, kAudioUnitManufacturer_Apple, 0, 0}; AudioComponent component = AudioComponentFindNext(NULL, &desc); AudioUnit audioUnit; err = AudioComponentInstanceNew(component, &audioUnit); if (err != noErr) { printf("Error creating AudioUnit\n"); exit(1); } // Enable IO for input on the AudioUnit and disable output UInt32 enableInput = 1; UInt32 disableOutput = 0; err = AudioUnitSetProperty(audioUnit, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Input, 1, &enableInput, sizeof(enableInput)); if (err != noErr) { printf("Error enabling input on AudioUnit\n"); exit(1); } err = AudioUnitSetProperty(audioUnit, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Output, 0, &disableOutput, sizeof(disableOutput)); if (err != noErr) { printf("Error disabling output on AudioUnit\n"); exit(1); } // Set the current device to the input device err = AudioUnitSetProperty(audioUnit, kAudioOutputUnitProperty_CurrentDevice, kAudioUnitScope_Global, 0, &input_device_id, sizeof(input_device_id)); if (err != noErr) { printf("Error setting device for AudioUnit\n"); exit(1); } // Initialize AudioUnit err = AudioUnitInitialize(audioUnit); if (err != noErr) { printf("Error initializing AudioUnit\n"); exit(1); } // Print device info printDeviceInfo(audioUnit); // Clean up AudioUnitUninitialize(audioUnit); AudioComponentInstanceDispose(audioUnit); } return 0; } It prints: Device Name: MacBook Pro Microphone Number of Channels (Stream Format): 1 Number of Elements (Element Count): 2 I tried to set the number of channels to 1 on the input unit, but it didn’t change anything. After calling setNumberOfChannels(1, audioUnit), I’m still getting the same output. Note 1: I know that I can ignore one channel, etc, etc. My purpose here is not to "somehow get it to work", I already did that. My purpose is to understand the API, so that I'll be able to write code that handles any number of audio inputs. Note 2: I already read a bunch of documentation, especially this here: https://developer.apple.com/library/archive/technotes/tn2091/ - perhaps the channel map could help here, but I can’t make sense of it - I tried to use it based on my understanding but I only got the -50 OSStatus. How should I understand this? Is it that that audio unit is an abstraction layer and automatically converts mono input into stereo input? Can I ask AUHAL to provide me the same number of input channels that the audio device has?

I'm trying to create an app that uses the Apple Music API and while I can fetch playlists as I desire when selecting a song from a playlist the music does not play. First I'm getting the playlists, then showing those playlists on a list in a view. Then pass that "song" which is a Track type into a PlayBackView. There are several UI components in that view but I want to boil it down here for simplicity's sake to better understand my problem. struct PlayBackView: View { @State private var playState: PlayState = .pause private let player = ApplicationMusicPlayer.shared @State var song: Track private var isPlaying: Bool { return (player.state.playbackStatus == .playing) } var body: some View { VStack { AsyncImage(url: song.artwork?.url(width: 100, height: 100)) { image in image .resizable() .frame(maxWidth: .infinity) .aspectRatio(1.0, contentMode: .fit) } placeholder: { Image(systemName: "music.note") .resizable() .frame(width: 100, height: 100) } // Song Title Text(song.title) .font(.title) // Album Title Text(song.albumTitle ?? "Album Title Not Found") .font(.caption) // Play/Pause Button Button(action: { handlePlayButton() }, label: { Image(systemName: playPauseImage) }) .padding() .foregroundStyle(.white) .font(.largeTitle) Image(systemName: airplayImage) .font(ifDeviceIsConnected ? .largeTitle : .title3) } .padding() } private func handlePlayButton() { Task { if isPlaying { player.pause() playState = .play } else { playState = .pause await playTrack(song: song) } } } @MainActor public func playTrack(song: Track) async { do { try await player.play() playState = .play } catch { print(error.localizedDescription) } } } These are the errors I'm seeing printing in the console in Xcode prepareToPlay failed [no target descriptor] The operation couldn’t be completed. (MPMusicPlayerControllerErrorDomain error 1.) ASYNC-WATCHDOG-1: Attempting to wake up the remote process ASYNC-WATCHDOG-2: Tearing down connection

Hi, I am trying to detect if an audio stream is Dolby Atmos. I have existing code that determines if a stream is Dolby Atmos based on the following: Channel count is greater than equal to 8 Binaural is true Immersive is true Downmix is false I am trying to determine if these rules are correct and documentation that specifies these rules that I can reference in the future. Any help you can provide is greatly appreciated. Regards, John

Is it possible to play audio in the Background or when the app is Terminated? If yes, how can I play audio in the Background or when the app is Terminated in iOS using Swift? I am receiving an audio link in a Firebase notification. How can I play this audio link when the app is in the Background or Terminated?

RealityContentKit bundle resource issue Recently I always encounter weird loading bugs from RealityKitContent bundle. When I was trying to load audio resource as AudioFileResource or AudioFileGroupResource by loading from *.usda from RealityKitContent bundle, with this method. My code is nothing complicated but simple as below: let primPath: String = "/SampleAudios/SE_bounce_audio" guard let resource = try? AudioFileGroupResource.load(named: primPath, from: "MyScene.usda", in: realityKitContentBundle) else { return } And the runtime program "sometimes"(whenever I change something RCP it somethings work again but the behavior is unpredictable) reports that it "Cannot find MyScene.usda:/SampleAudios/SE_bounce_audio in RealityKitContent.bundle". I put MyScene.usda under the root folder of RealityKitContent package because I found that RealityKit just cannot find any *.usda scene if you didn't put that on the root level (could be a bug because of the way it indexes its files). I even double checked my .usda file with usdview, the primPath is absolutely correct. I think there are some unknown issues when RealityKitContent copy resources and build the package. I tried to play with the package Package.swift file a bit to see if I could manually copy my resources (everything) and let the package carry my resources but it just didn't work. So right now I just keep this file untouched below (just upgrade the swift-tools-version to 6.0 as only that can supports .visionOS(.v2)): // swift-tools-version:6.0 // The swift-tools-version declares the minimum version of Swift required to build this package. import PackageDescription let package = Package( name: "RealityKitContent", platforms: [ .visionOS(.v2) ], products: [ // Products define the executables and libraries a package produces, and make them visible to other packages. .library( name: "RealityKitContent", targets: ["RealityKitContent"]), ], dependencies: [ // Dependencies declare other packages that this package depends on. // .package(url: /* package url */, from: "1.0.0"), ], targets: [ // Targets are the basic building blocks of a package. A target can define a module or a test suite. // Targets can depend on other targets in this package, and on products in packages this package depends on. .target( name: "RealityKitContent" ), ] ) That is just issue one, RealityKitContent package build issue. Audio file format issue Another is about Audio File Format RCP supports. I remember is a place (WWDC?) saying .wav and .mp4 are supported to be used as audio source. But when I try to set up Spatial Audio, I find sometimes *.wav or *.mp3 can also be imported as AudioSourceFile. But the behavior is unpredictable. With two *.wav files SE_ball_hit_01.wav and SE_ball_hit_02.wav, only SE_ball_hit_01.wav is supported, 02 is reported as the format is not supported/ Check out my screenshots to see the details of two files. Two files have almost the same format (same sample rate or channel). I understand there might be different requirements for a source file to be used as Spatial or Ambient audio. But I haven't figured that out or there is nothing I can find helpful on Apple Documentation. So what is the rules? Thanks for reading and any thought is welcomed.

I have an application that downloads content using AVAssetDownloadTask. In the iOS Settings app, these downloads are listed in the Storage section as a collection of downloaded movies, displaying the asset image, whether it's already watched, the file size, and an option to delete it. Curious about how other apps handle this display, I noticed that Apple Music shows every downloaded artist, album, and song individually. This feature made me wonder: can I achieve something similar in my application? On the other hand, apps like Spotify and Amazon Music don’t show any downloaded files in the Settings app. Is it possible to implement that approach as well? Here is print screen of the Apple Music Storage section in the Settings App: I tried moving the download directory into sub folder using the FileManager, but all the results made the downloads stop showing in the setting app

iOS Audio Lockscreen Problem in PWA Description When running a PWA on iOS; playing audio from the lockscreen works as expected until you leave the audio paused for 30 seconds. After this, the audio will cease to function until you return the PWA to the foreground. Reproduction In a PWA, create an HTML 5 audio element. Load an audio file into it. Set navigator.mediaSession data and action handlers for play and pause. Everything is in working order and your audio plays and pauses from the lock screen. Pause your audio and wait for 30 seconds. Now, press the play button. Your audio will no longer function. At this point, the only way to get the audio to function again is to open the PWA into the foreground. Once you do this, the audio will be in working order. What is expected In step number 6, when you press the play button, the audio should play. The lock screen audio should not enter a non-functional state or there should be some way to "wake up" the PWA. Closing If you follow these steps exactly on Android, you will see that the problem does not exist on those devices.

Audio getting disabled, Not able to control audio, When opening music player audio works but not on instagram or any other apps. Audio button on notification bar is greyed out as getting disabled.

Hi! I am working with a team in developing a multichannel based audio web application. The whole structure is based on multiple tracks playing in sync, so after some research and failed attempts, we ended up going with the solution of having one audio buffer (HTMLAudioElement), containing a multichannel file (specifically 8 channels) that we play, split the channels, process them separately, and play the result back to the user. We started doing this with multichannel wav files, and it worked great but every playback was way too large to be scalable, so we started looking into other multichannel-capable files. So far we have tried aac, opus and webm, none of which has worked properly in safari. I've looked in the apple developer documentation, HLS and all that, and seems like the only option is eac3, but I haven't been able to convert any of my files to that format, and I have been really trying. The other option we have been exploring is decoding opus files with WASM manually, but with little success to date. Has anyone been able to achieve anything similar to this? Thanks!

Hello, I hope this message finds you well. I am currently working on a Unity-based iOS application that requires continuous microphone input while also producing sound outputs. For this we need to use iOS echo cancellation, so some sounds need to be played via the iOS layer w/ echo cancellation, I am manually setting up the Audio Session after the app starts. Using the .playAndRecord mode of AVAudioSession. However, I am facing an issue where the volume of the sound output is inconsistent across different iOS devices and scenarios. The process is quite simple, for each AudioClip we are about to play via unity, we copy the buffer data to our iOS Swift layer, which then does all the processing then plays the audio via the native layer. Here are the specific issues I am encountering: The volume level for the game sound effects fluctuate between a normal audible volume and a very low volume. The sound output behaves differently depending on whether the app is launched with the device at full volume or on mute, and if the app is put into background and in foreground afterwards. The volume inconsistency affects my game negatively, as it is very hard to hear some audios, regardless of the device or its initial volume state. I have followed the basic setup for AVAudioSession as per the documentation, but the inconsistencies persist. I'm also aware that Unity uses FMOD to set up the audio routing in iOS, we configure our custom routing after that. We tried tweaking the output volume prior to playing an audio so there isn't much discrepancy, this seems to align the output volume, however there is still some places where the volume is super low, I've looked into the waveforms in Unity and they all seem consistent, there is no reason why the volume would take a dip. private var audioPlayer = AVAudioPlayerNode() @objc public func Play() { audioPlayer.volume = AVAudioSession.sharedInstance().outputVolume * 0.25 audioPlayer.play() } We also explored changing the audio session options to see if we had any luck but unfortunately nothing has changed. private func ConfigAudioSession() { let audioSession = AVAudioSession.sharedInstance(); do { try audioSession.setCategory(.playAndRecord, options: [.mixWithOthers, .allowBluetooth, .defaultToSpeaker]); try audioSession.setMode(.spokenAudio) try audioSession.setActive(true); } catch { //Treat error } } Could anyone provide guidance or suggest best practices to ensure a stable and consistent volume output in this scenario? Any advice on this issue would be greatly appreciated. Thank you in advance for your help!

I have an iPad Pro 12.9". I am looking to make an app which can take a simultaneous audio recording from two different microphones at the same time. I want to be able to specify which of the 5 built-in microphones each audio stream should use - ideally one should be from the microphone on the left side of the iPad, and the other should be from one of the mics at the top of the iPad. Is this possible to achieve with the API? The end goal here is to be able to use the two audio streams and do some DSP on the recordings to determine the approximate direction a particular sound comes from.

In my iOS app, I've the functionality to record audio and video using the AVFoundation framework. While audio recording works smoothly on some devices, such as iPads and certain others, I'm encountering issues with newer models like iPhone 14, 14 Pro, and 15 series. Specifically, when attempting to initiate audio recording by tapping the microphone icon, the interface becomes unresponsive and remains static. This issue surfaced following an update to iOS 17.2.1. It seems to affect only a subset of devices, despite video recording functioning correctly across all devices.

Just installed iOS 18 Beta 3. I am seeing my AccessibilityUIServer using the microphone and this is causing no notification sounds, inability to use Siri by voice and volume is grayed out. If I start to play anything with sound AccessibilityUIServer releases the microphone and I am able to use the app. Calls still work since AccessibilityUIServer will release and the phone will ring. Feed back ID is FB14241838.

I have a new iPhone 15 PRO and some new Usb-C Earphones too, both are 3 days old. Since the first day I have been having this Error 1852797029. I can be listening to music on Apple Music for a while but when I stop it and a while passes without resuming playback, when I resume it it gives me this error and I have to close the App and disconnecting and connecting the earphones again. It's very annoying and I'm very angry that this is happening to me from day one. With both devices completely new. Does anyone have a solution other than connecting and disconnecting the earphones?

I have an application which is based on a video streaming service. A critical thing about this app is that these videos must be secured all the way and can't be pirated. The current problem I have is that anyone can use voice recorder to capture my videos audio which isn't suitable this app purpose. My question is Is there anyway that I can disable using any voice recording apps (or the microphone) and detect if someone tried to while streaming videos from my app? Thanks in advance