Dive into the technical aspects of audio on your device, including codecs, format support, and customization options.

Audio Documentation

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mp3 audio plays on my device and simulator but some users have issue
Hi I just released an app which is live. i have a strange issue: while the audio files in the app play fine on my device, but some users are unable to hear. One friend said it played yesterday but not today. Any idea why? The files are mp3, I see them in Build Phase, and in the project obviously. Here's the audio view code, thank you! import AVFoundation struct MeditationView: View { @State private var player: AVAudioPlayer? @State private var isPlaying = false @State private var selectedMeditation: String? var isiPad = UIDevice.current.userInterfaceIdiom == .pad let columns = [GridItem(.flexible()),GridItem(.flexible())] let tracks = ["Intro":"intro.mp3", "Peace" : "mysoundbath1.mp3", "Serenity" : "mysoundbath2.mp3", "Relax" : "mysoundbath3.mp3"] var body: some View { VStack{ VStack{ VStack{ Image("dhvani").resizable().aspectRatio(contentMode: .fit) .frame(width: 120) Text("Enter the world of Dhvani soundbath sessions, click lotus icon to play.") .font(.custom("Times New Roman", size: 20)) .lineLimit(nil) .multilineTextAlignment(.leading) .fixedSize(horizontal: false, vertical: true) .italic() .foregroundStyle(Color.ashramGreen) .padding() } LazyVGrid(columns:columns, spacing:10){ ForEach(tracks.keys.sorted(),id:\.self){ track in Button { self.playMeditation(named: tracks[track]!) } label: { Image("lotus") .resizable() .frame(width: 40,height: 40) .background(Color.ashramGreen) .cornerRadius(10) } Text(track) .font(.custom("Times New Roman", size: 22)) .foregroundStyle(Color.ashramGreen) .italic() } } HStack(spacing:20) { Button(action: { self.togglePlayPause() }) { Image(systemName: isPlaying ? "playpause.fill" : "play.fill") .resizable() .frame(width: 20, height: 20) .foregroundColor(Color.ashramGreen) } Button(action: { self.stopMeditation() }) { Image(systemName: "stop.fill") .resizable() .frame(width: 20, height: 20) .foregroundColor(Color.ashramGreen) } } }.padding() .background(Color.ashramBeige) .cornerRadius(20) Spacer() //video play VStack{ Text("Chant") .font(.custom("Times New Roman", size: 24)) .foregroundStyle(Color.ashramGreen) .padding(5) WebView(urlString: "https://www.youtube.com/embed/ny3TqP9BxzE") .frame(height: isiPad ? 400 : 200) .cornerRadius(10) .padding() Text("Courtesy Sri Ramanasramam").font(.footnote).italic() } }.background(Color.ashramBeige) } //View func playMeditation(named name: String) { if let url = Bundle.main.url(forResource: name, withExtension: nil) { do { player = try AVAudioPlayer(contentsOf: url) player?.play() isPlaying = true } catch { print("Error playing meditation") } } } func togglePlayPause() { if let player = player { if player.isPlaying { player.pause() isPlaying = false } else { player.play() isPlaying = true } } } func stopMeditation() { player?.stop() isPlaying = false } } #Preview { MeditationView() }
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335
Nov ’24
AudioQueue error 561145187
our app meet a wired problem for online version. more and more user get 561145187 when try to call this code: AudioQueueNewInput(&self->_recordFormat, inputBufferHandler, (__bridge void *)(self), NULL, NULL, 0, &self->_audioQueue)" I search for several weeks, but nothing help. we sum up all issues devices, found some similarity: only happens on iPad OS 14.0 + occurred when app started or wake from background (we call the code when app received "UIApplicationDidBecomeActiveNotification") Any Idea why this happens?
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1.2k
Nov ’24
No charts genres for some storefronts
Hello, This is about the Get Catalog Top Charts Genres endpoint : GET https://api.music.apple.com/v1/catalog/{storefront}/genres I noticed that for some storefronts, no genre is returned. You can try with the following storefront values : France (fr) Poland (pl) Kyrgyzstan (kg) Uzbekistan (uz) Turkmenistan (tm) Is that a bug or is it on purpose ? Thank you.
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423
Dec ’24
AVMIDIPlayer not working for all instruments
Hi, I test AVMIDIPlayer in order to replace classes written based on AVAudioEngine with callbacks functions sending MIDI events to test, I use an NSMutableData filled with: the MIDI header a track for time signature a track containing a few midi events. I then create an instance of the AVMIDIPlayer using the data Everything works fine for some instrument (00 … 20) or 90 but not for other instruments 60, 70, … The MiDI header and the time signature track are based on the MIDI.org sample, https://midi.org/standard-midi-files-specification RP-001_v1-0_Standard_MIDI_Files_Specification_96-1-4.pdf the midi events are: UInt8 trkEvents[] = { 0x00, 0xC0, instrument, // Tubular bell 0x00, 0x90, 0x4C, 0xA0, // Note 4C 0x81, 0x40, 0x48, 0xB0, // TS + Note 48 0x00, 0xFF, 0x2F, 0x00}; // End for (UInt8 i=0; i<3; i++) { printf("0x%X ", trkEvents[i]); } printf("\n"); [_midiTempData appendBytes:trkEvents length:sizeof(trkEvents)]; A template application is used to change the instrument in a NSTextField I was wondering if specifics are required for some instruments? The interface header: #import <AVFoundation/AVFoundation.h> NS_ASSUME_NONNULL_BEGIN @interface TestMIDIPlayer : NSObject @property (retain) NSMutableData *midiTempData; @property (retain) NSURL *midiTempURL; @property (retain) AVMIDIPlayer *midiPlayer; - (void)createTest:(UInt8)instrument; @end NS_ASSUME_NONNULL_END The implementation: #pragma mark - typedef struct _MThd { char magic[4]; // = "MThd" UInt8 headerSize[4]; // 4 Bytes, MSB first. Always = 00 00 00 06 UInt8 format[2]; // 16 bit, MSB first. 0; 1; 2 Use 1 UInt8 trackCount[2]; // 16 bit, MSB first. UInt8 division[2]; // }MThd; MThd MThdMake(void); void MThdPrint(MThd *mthd) ; typedef struct _MIDITrackHeader { char magic[4]; // = "MTrk" UInt8 trackLength[4]; // Ignore, because it is occasionally wrong. } Track; Track TrackMake(void); void TrackPrint(Track *track) ; #pragma mark - C Functions MThd MThdMake(void) { MThd mthd = { "MThd", {0, 0, 0, 6}, {0, 1}, {0, 0}, {0, 0} }; MThdPrint(&mthd); return mthd; } void MThdPrint(MThd *mthd) { char *ptr = (char *)mthd; for (int i=0;i<sizeof(MThd); i++, ptr++) { printf("%X", *ptr); } printf("\n"); } Track TrackMake(void) { Track track = { "MTrk", {0, 0, 0, 0} }; TrackPrint(&track); return track; } void TrackPrint(Track *track) { char *ptr = (char *)track; for (int i=0;i<sizeof(Track); i++, ptr++) { printf("%X", *ptr); } printf("\n"); } @implementation TestMIDIPlayer - (id)init { self = [super init]; printf("%s %p\n", __FUNCTION__, self); if (self) { _midiTempData = nil; _midiTempURL = [[NSURL alloc]initFileURLWithPath:@"midiTempUrl.mid"]; _midiPlayer = nil; [self createTest:0x0E]; NSLog(@"_midiTempData:%@", _midiTempData); } return self; } - (void)dealloc { [_midiTempData release]; [_midiTempURL release]; [_midiPlayer release]; [super dealloc]; } - (void)createTest:(UInt8)instrument { /* MIDI Header */ [_midiTempData release]; _midiTempData = nil; _midiTempData = [[NSMutableData alloc]initWithCapacity:1024]; MThd mthd = MThdMake(); MThd *ptrMthd = &mthd; ptrMthd->trackCount[1] = 2; ptrMthd->division[1] = 0x60; MThdPrint(ptrMthd); [_midiTempData appendBytes:ptrMthd length:sizeof(MThd)]; /* Track Header Time signature */ Track track = TrackMake(); Track *ptrTrack = &track; ptrTrack->trackLength[3] = 0x14; [_midiTempData appendBytes:ptrTrack length:sizeof(track)]; UInt8 trkEventsTS[]= { 0x00, 0xFF, 0x58, 0x04, 0x04, 0x04, 0x18, 0x08, // Time signature 4/4; 18; 08 0x00, 0xFF, 0x51, 0x03, 0x07, 0xA1, 0x20, // tempo 0x7A120 = 500000 0x83, 0x00, 0xFF, 0x2F, 0x00 }; // End [_midiTempData appendBytes:trkEventsTS length:sizeof(trkEventsTS)]; /* Track Header Track events */ ptrTrack->trackLength[3] = 0x0F; [_midiTempData appendBytes:ptrTrack length:sizeof(track)]; UInt8 trkEvents[] = { 0x00, 0xC0, instrument, // Tubular bell 0x00, 0x90, 0x4C, 0xA0, // Note 4C 0x81, 0x40, 0x48, 0xB0, // TS + Note 48 0x00, 0xFF, 0x2F, 0x00}; // End for (UInt8 i=0; i<3; i++) { printf("0x%X ", trkEvents[i]); } printf("\n"); [_midiTempData appendBytes:trkEvents length:sizeof(trkEvents)]; [_midiTempData writeToURL:_midiTempURL atomically:YES]; dispatch_async(dispatch_get_main_queue(), ^{ if (!_midiPlayer.isPlaying) [self midiPlay]; }); } - (void)midiPlay { NSError *error = nil; _midiPlayer = [[AVMIDIPlayer alloc]initWithData:_midiTempData soundBankURL:nil error:&error]; if (_midiPlayer) { [_midiPlayer prepareToPlay]; [_midiPlayer play:^{ printf("Midi Player ended\n"); [_midiPlayer stop]; [_midiPlayer release]; _midiPlayer = nil; }]; } } @end Call from AppDelegate - (IBAction)actionInstrument:(NSTextField*)sender { [_testMidiplayer createTest:(UInt8)sender.intValue]; }
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422
Dec ’24
Swift iOS CallKit audio resource contention
I noticed the following behavior with CallKit when receiving a VolP push notification: When the app is in the foreground and a CallKit incoming call banner appears, pressing the answer button directly causes the speaker indicator in the CallKit interface to turn on. However, the audio is not actually activated (the iPhone's orange microphone indicator does not light up). In the same foreground scenario, if I expand the CallKit banner before answering the call, the speaker indicator does not turn on, but the orange microphone indicator does light up, and audio works as expected. When the app is in the background or not running, the incoming call banner works as expected: I can answer the call directly without expanding the banner, and the speaker does not turn on automatically. The orange microphone indicator lights up as it should. Why is there a difference in behavior between answering directly from the banner versus expanding it first when the app is in the foreground? Is there a way to ensure consistent audio activation behavior across these scenarios?
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378
Dec ’24
Swift iOS CallKit audio resource contention
I noticed the following behavior with CallKit when receiving a VolP push notification: When the app is in the foreground and a CallKit incoming call banner appears, pressing the answer button directly causes the speaker indicator in the CallKit interface to turn on. However, the audio is not actually activated (the iPhone's orange microphone indicator does not light up). In the same foreground scenario, if I expand the CallKit banner before answering the call, the speaker indicator does not turn on, but the orange microphone indicator does light up, and audio works as expected. When the app is in the background or not running, the incoming call banner works as expected: I can answer the call directly without expanding the banner, and the speaker does not turn on automatically. The orange microphone indicator lights up as it should. Why is there a difference in behavior between answering directly from the banner versus expanding it first when the app is in the foreground? Is there a way to ensure consistent audio activation behavior across these scenarios? I tried reconfiguring the audio when answering a call, but an error occurred during setActive, preventing the configuration from succeeding. let audioSession = AVAudioSession.sharedInstance() do { try audioSession.setActive(false) try audioSession.setCategory(.playAndRecord, mode: .voiceChat, options: [.defaultToSpeaker]) try audioSession.setActive(true, options: []) } catch { print("Failed to activate audio session: \(error)") } action.fulfill() } Error Domain=NSOSStatusErrorDomain Code=561017449 "Session activation failed" UserInfo={NSLocalizedDescription=Session activation failed}
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482
Dec ’24
AVMIDIPlayer ignores initial track volume settings on first playback
Issue Description When playing certain MIDI files using AVMIDIPlayer, the initial volume settings for individual tracks are being ignored during the first playback. This results in all tracks playing at the same volume level, regardless of their specified volume settings in the MIDI file. Steps to Reproduce Load a MIDI file that contains different volume settings for multiple tracks Start playback using AVMIDIPlayer Observe that all tracks play at the same volume level, ignoring their individual volume settings Current Behavior All tracks play at the same volume level during initial playback Track volume settings specified in the MIDI file are not being respected This behavior consistently occurs on first playback of affected MIDI files Expected Behavior Each track should play at its specified volume level from the beginning Volume settings in the MIDI file should be respected from the first playback Workaround I discovered that the correct volume settings can be restored by: Starting playback of the MIDI file Setting the currentPosition property to (current time - 1 second) After this operation, all tracks play at their intended volume levels However, this is not an ideal solution as it requires manual intervention and may affect the playback experience. Questions Is there a way to ensure the track volume settings are respected during the initial playback? Is this a known issue with AVMIDIPlayer? Are there any configuration settings or alternative approaches that could resolve this issue? Technical Details iOS Version: 18.1.1 (22B91) Xcode Version: 16.1 (16B40)
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292
Dec ’24
AVSpeechSynthesizer - just not working on 15.1.1
So get a swift file and put this in it import Foundation import AVFoundation let synthesizer = AVSpeechSynthesizer() let utterance = AVSpeechUtterance(string: "Hello, testing speech synthesis on macOS.") if let voice = AVSpeechSynthesisVoice(identifier: "com.apple.voice.compact.en-GB.Daniel") { utterance.voice = voice print("Using voice: \(voice.name), \(voice.language)") } else { print("Daniel voice not found on macOS.") } synthesizer.speak(utterance) I get no speech output and this log output Error reading languages in for local resources. Error reading languages in for local resources. Using voice: Daniel, en-GB Program ended with exit code: 0 Why? and whats with "Error reading languages in for local resources." ?
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921
Dec ’24
SFCustomLanguageModelData.CustomPronunciation and X-SAMPA string conversion
Can anyone please guide me on how to use SFCustomLanguageModelData.CustomPronunciation? I am following the below example from WWDC23 https://wwdcnotes.com/documentation/wwdcnotes/wwdc23-10101-customize-ondevice-speech-recognition/ While using this kind of custom pronunciations we need X-SAMPA string of the specific word. There are tools available on the web to do the same Word to IPA: https://openl.io/ IPA to X-SAMPA: https://tools.lgm.cl/xsampa.html But these tools does not seem to produce the same kind of X-SAMPA strings used in demo, example - "Winawer" is converted to "w I n aU @r". While using any online tools it gives - "/wI"nA:w@r/".
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795
Dec ’24
Increased delay when AUGraph's output device is system output
I'm using an AUGraph to mix audio from different sources for a real time streaming application. Whenever the audio device used as the graph's output device is also the Mac's default output device, the measured latency increases by about 35 milliseconds for wired devices. Any idea why this is? Is there a way around this besides nagging the user to not the use the system output in our app?
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288
Dec ’24
Delay w/ new AudioTap API when system device is a BL device
I'm capturing audio from other applications on macOS to mix them with other sources in a real time streaming application. I noticed that audio data captured via the new tapping mechanism introduced in macOS 14.2 arrives delayed in my app, when the macOS system device is a Bluetooth headphone, e.g. Apple AirPods. Sometimes this delay is about 300-400 milliseconds, which makes it unusable for live streaming, because the audio is out of sync with the video and also audio captured from other devices. What is confusing to me, is that this also happens when my app does not even use that output device. Is this a known issue? Is there a way around this?
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379
Dec ’24
AudioServicesPlaySystemSound not playing through BluetoothA2DP device
Hello We have an application that play some sound via the system sound APIs from the AudioToolbox framework. AudioServicesCreateSystemSoundID(url as CFURL, &soundID) AudioServicesPlaySystemSoundWithCompletion(soundID) Our make sure that an active audio session is available before playing the system sound. But when the device is connected to a BluetoothA2DP device. The sound are played on through the device speaker and not through the bluetooth A2DP device. Our AudioSesison is configured with the following categories [.allowBluetooth, .defaultToSpeaker, .allowBluetoothA2DP] Sound played from the AVAudioPlayer are played on the allowBluetoothA2DP device with similar code. Is this a bug in the AudioToolbox framework?
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536
Dec ’24
AVAudioEngineConfigurationChange Clearing AVPlayerNode
Hi all, I am working on an app where I have live prompts playing, in addition to a voice channel that sometimes becomes active. Right now I am using two different AVAudioSession Configurations so what we only switch to a mic enabled mode when we actually need input from the mic. These are defined below. When just using the device hardware, everything works as expected and the modes change and the playback continues as needed. However when using bluetooth devices such as AirPods where the switch from AD2P to HFP is needed, I am getting a AVAudioEngineConfigurationChange notification. In response I am tearing down the engine and creating a new one with the same 2 player nodes. This does work fine and there are no crashes, except all the audio I have scheduled on a player node has now been cleared. All the completion blocks marked with ".dataPlayedBack" return the second this event happens, and leaves me in a state where I now have a valid engine setup again but have no idea what actually played, or was errantly marked as such. Is this the expected behavior when getting a configuration change notification? Adding some information below to my audio graph for context: All my parts of the graph, I disconnect when getting this event and do the same to the new engine private var inputEngine: AVAudioEngine private var audioEngine: AVAudioEngine private let voicePlayerNode: AVAudioPlayerNode private let promptPlayerNode: AVAudioPlayerNode audioEngine.attach(voicePlayerNode) audioEngine.attach(promptPlayerNode) audioEngine.connect( voicePlayerNode, to: audioEngine.mainMixerNode, format: voiceNodeFormat ) audioEngine.connect( promptPlayerNode, to: audioEngine.mainMixerNode, format: nil ) An example of how I am scheduling playback, and where that completion is firing even if it didn't actually play. private func scheduleVoicePlayback(_ id: AudioPlaybackSample.Id, buffer: AVAudioPCMBuffer) async throws { guard !voicePlayerQueue.samples.contains(where: { $0 == id }) else { return } seprateQueue.append(buffer) if !isVoicePlaying { activateAudioSession() } voicePlayerQueue.samples.append(id) if !voicePlayerNode.isPlaying { voicePlayerNode.play() } if let convertedBuffer = buffer.convert(to: voiceNodeFormat) { await voicePlayerNode.scheduleBuffer(convertedBuffer, completionCallbackType: .dataPlayedBack) } else { throw AudioPlaybackError.failedToConvert } voiceSampleHasBeenPlayed(id) } And lastly my audio session configuration if its useful. extension AVAudioSession { static func setDefaultCategory() { do { try sharedInstance().setCategory( .playback, options: [ .duckOthers, .interruptSpokenAudioAndMixWithOthers ] ) } catch { print("Failed to set default category? \(error.localizedDescription)") } } static func setVoiceChatCategory() { do { try sharedInstance().setCategory( .playAndRecord, options: [ .defaultToSpeaker, .allowBluetooth, .allowBluetoothA2DP, .duckOthers, .interruptSpokenAudioAndMixWithOthers ] ) } catch { print("Failed to set category? \(error.localizedDescription)") } } }
1
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657
Dec ’24
AVAudioEngine - How to archive configured nodes to file?
I’m looking to add DAW-like capabilities to my macOS music app, and AVAudioEngine seems like the right tool for the job. However, I haven’t been able to find any documentation on how to save the user’s AVAudioEngine configuration—specifically the connections between nodes and the internal states of each node—to a file. Does AVAudioEngine provide any API for saving and restoring this state, or does it need to be handled manually? If it’s manual, are there any sample "DAW" apps or resources that demonstrate how this can be implemented? Any guidance would be greatly appreciated. Thanks, BD
1
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479
Dec ’24
Normal audio mode AirPods IOS 18.1
Hi everyone, I just upgraded my iPhone to 18.1.1. I noticed the absence of the normal mode on my AirPods. I can't stand the noise cancellation mode for too long and the transparency one is overwhelming everytime a hair is brushing near by my AirPods. Why is that? I don't really see the progression here. Can you this be fixed in the next version? I don't want to buy another brand, I use them everyday for many hours.
1
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403
Dec ’24
Error Domain=NSOSStatusErrorDomain Code=-16384, -16155, -16512
I’ve built a custom media player using AVSampleBufferAudioRenderer and AVSampleBufferRenderSynchronizer, and overall, it works great! However, I’ve noticed some unusual logs popping up: Domain: NSOSStatusErrorDomain Error Codes: -16384, -16155, -16512 *That error -16512 keeps happening repeatedly for one of our users, preventing them from playing any media at all. I’ve searched around but can’t find any documentation explaining what these errors mean. Has anyone run into this issue or have any suggestions? Any help would be hugely appreciated! Thanks!
1
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959
Dec ’24
AVAudioSession's "availableInputs" not update in time
// Here addObserver for routeChangeNotification func testAudioRoute() { // My app is an VoIP app, so I need to set "playAndRecord" and "allowBluetooth" try? AVAudioSession.sharedInstance().setCategory(.playAndRecord, options: [.duckOthers, .allowBluetooth, .allowBluetoothA2DP]) NotificationCenter.default.addObserver(self, selector: #selector(currentRouteChanged(noti:)), name: AVAudioSession.routeChangeNotification, object: nil) } // Print the "availableInputs" once got a notification @objc func currentRouteChanged(noti: Notification) { let availableInputs = AVAudioSession.sharedInstance().availableInputs?.compactMap({ $0.portType }) ?? [] let currentRouteInputs = AVAudioSession.sharedInstance().currentRoute.inputs.compactMap({ $0.portType }) let currentRouteOutputs = AVAudioSession.sharedInstance().currentRoute.outputs.compactMap({ $0.portType }) print("willtest: \navailableInputs=\(availableInputs), \ncurrentRouteInputs=\(currentRouteInputs), \ncurrentRouteOutputs=\(currentRouteOutputs)") /* When BT (Airpods pro 2) CONNECTTED: it will print like below when notification comes, this is correct. ---------------------------------------------------------- willtest: availableInputs=[__C.AVAudioSessionPort(_rawValue: MicrophoneBuiltIn), __C.AVAudioSessionPort(_rawValue: BluetoothHFP)], currentRouteInputs=[], currentRouteOutputs=[__C.AVAudioSessionPort(_rawValue: BluetoothA2DPOutput)] ---------------------------------------------------------- When BT (Airpods pro 2) DISCONNECTTED: it will print like below when notification comes, this is wrong. ---------------------------------------------------------- availableInputs=[__C.AVAudioSessionPort(_rawValue: MicrophoneBuiltIn), __C.AVAudioSessionPort(_rawValue: BluetoothHFP)], currentRouteInputs=[], currentRouteOutputs=[__C.AVAudioSessionPort(_rawValue: Speaker)] */ } So my question here is: Why does the "availableInputs" still contain the "C.AVAudioSessionPort(_rawValue: BluetoothHFP)" item even though I have already disconnected the BT device? (Put AirPods in the case.) BTW, if I tap the "Manual" button once I disconnected the BT, it also prints the "wrong" value for "availableInputs", and it will become normal after about 3~4 seconds.
4
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494
Dec ’24
MusicKit lastPlayedDate always nil
I am having trouble accessing the lastPlayedData for any given album or track using MusicKit. The value is always nil, both on numerous albums and tracks I tested. Afaik this is not a property that has to be fetched separately like tracks for example. I am running this on my physical iPhone 12 18.1.1 with Xcode 16.1. The albums and tracks have definitely been played multiple times before. The app has permission to the library using MusicAuthorization.request() This post mentions the same problem but offers no solution. Thanks for any help
0
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443
Dec ’24
Listener for kAudioProcessPropertyIsRunningOutput
I'm trying to setup a listener for kAudioProcessPropertyIsRunningOutput but it's never triggered. I get calls for kAudioProcessPropertyIsRunning and kAudioProcessPropertyDevices but not for kAudioProcessPropertyIsRunningInput or kAudioProcessPropertyIsRunningOutput. class MyDelegate: PropertyListenerDelegate { func propertiesChanged(properties: [AudioObjectPropertyAddress]) { print(properties) } } var myDelegate = MyDelegate() var processes = try AudioHardwareSystem.shared.processes for process in processes { process.delegates += [myDelegate] try process.addListener(forProperties: [AudioObjectPropertyAddress(mSelector: kAudioPropertyWildcardPropertyID, mScope: kAudioObjectPropertyScopeWildcard, mElement: kAudioObjectPropertyElementWildcard)]) } Xcode 16.1 macOS 15.0.1
0
0
471
Dec ’24
AirPods Audio Sample Rate Issue on macOS Sequoia
I’m experiencing an unusual audio issue with AirPods on macOS Sequoia while developing VoIP applications like Zoom and FaceTime. When AirPods are connected, the other party’s voice sometimes sounds unnaturally stretched (approximately twice as long). This problem can be temporarily fixed by switching the sound output settings from AirPods to speakers and then back to AirPods. From our analysis, the issue appears to be related to the sample rate provided by AudioObjectGetPropertyData. Here’s what we’ve observed: When the issue occurs, the AudioStreamBasicDescription.sampleRate for AirPods is reported as 48000. Under normal conditions, it’s reported as 24000. It seems like the system is mistakenly returning a sample rate that doesn’t match the AirPods’ actual settings, perhaps defaulting to a system speaker value. Once the output setting is toggled, the correct sampleRate (24000) is retrieved. This discrepancy causes our application to transmit the audio stream at 48000, leading to the distorted playback. Has anyone encountered a similar issue or knows how to resolve it?
2
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581
Dec ’24