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I have a USB audio interface that is causing kernel traps and the audio output to "skip" or dropout every few seconds. This behavior occurs with a completely fresh install of Catalina as well as Big Sur with the stock Music app on a 2019 MacBook Pro 16 (full specs below).
The Console logs show coreaudiod got an error from a kernel trap, a "USB Sound assertion" in AppleUSBAudio/AppleUSBAudio-401.4/KEXT/AppleUSBAudioDevice.cpp at line 6644, and the Music app "skipping cycle due to overload."
I've added a short snippet from Console logs around the time of the audio skip/drop out. The more complete logs are at this gist:
https://gist.github.com/djflux/08d9007e2146884e6df1741770de5105
I've also opened a Feedback Assistant ticket (FB9037528):
https://feedbackassistant.apple.com/feedback/9037528
Does anyone know what could be causing this issue?
Thanks for any help.
Cheers,
Flux aka Andy.
Hardware Overview:
Model Name: MacBook Pro
Model Identifier: MacBookPro16,1
Processor Name: 8-Core Intel Core i9
Processor Speed: 2.4 GHz
Number of Processors: 1
Total Number of Cores: 8
L2 Cache (per Core): 256 KB
L3 Cache: 16 MB
Hyper-Threading Technology: Enabled
Memory: 64 GB
System Firmware Version: 1554.80.3.0.0 (iBridge: 18.16.14347.0.0,0)
System Software Overview:
System Version: macOS 11.2.3 (20D91)
Kernel Version: Darwin 20.3.0
Boot Volume: Macintosh HD
Boot Mode: Normal
Computer Name: mycomputername
User Name: myusername
Secure Virtual Memory: Enabled
System Integrity Protection: Enabled
USB interface: Denon DJ DS1
Snippet of Console logs
error 21:07:04.848721-0500 coreaudiod HALS_IOA1Engine::EndWriting: got an error from the kernel trap, Error: 0xE00002D7
default 21:07:04.848855-0500 Music HALC_ProxyIOContext::IOWorkLoop: skipping cycle due to overload
default 21:07:04.857903-0500 kernel USB Sound assertion (Resetting engine due to error returned in Read Handler) in /AppleInternal/BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleUSBAudio/AppleUSBAudio-401.4/KEXT/AppleUSBAudioDevice.cpp at line 6644
...
default 21:07:05.102746-0500 coreaudiod Audio IO Overload inputs: 'private' outputs: 'private' cause: 'Unknown' prewarming: no recovering: no
default 21:07:05.102926-0500 coreaudiod CAReportingClient.mm:508 message {
HostApplicationDisplayID = "com.apple.Music";
cause = Unknown;
deadline = 2615019;
"input_device_source_list" = Unknown;
"input_device_transport_list" = USB;
"input_device_uid_list" = "AppleUSBAudioEngine:Denon DJ:DS1:000:1,2";
"io_buffer_size" = 512;
"io_cycle" = 1;
"is_prewarming" = 0;
"is_recovering" = 0;
"issue_type" = overload;
lateness = "-535";
"output_device_source_list" = Unknown;
"output_device_transport_list" = USB;
"output_device_uid_list" = "AppleUSBAudioEngine:Denon DJ:DS1:000:1,2";
}: (null)
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I was watching a video when I noticed a periodical popping sound. Thought it was a problem with the video, but the issue persists on all other videos or sound tracks. Gets very annoying! Quite disappointed to find this flaw in a brand new Mac Book Pro.
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Hello, I am an audio developer, currently using macOS version 14.1.1. I noticed that after disabling the microphone, the small yellow dot in the Control Center disappears immediately, but the one in the menu bar takes about 20 seconds to disappear. I tested the built-in Voice Memos app and found the same behavior. Our users may be concerned about their privacy being violated, even though the software is not using the microphone at that time.
We believe this is a bug, and the microphone icon in the menu bar should disappear immediately after the microphone is no longer in use. Do you have plans to fix this issue in future versions? Additionally, is there any workaround for the current version?
As a supplement, we are using CoreAudio API with AudioDeviceStart & AudioDeviceStop, not AudioUnit.
Post not yet marked as solved
Hi,
This topic is about Workgroups.
I create child processes and I'd like to communicate a os_workgroup_t to my child process so they can join the work group as well.
As far as I understand, the os_workgroup_t value is local to the process.
I've found that one can use os_workgroup_copy_port() and os_workgroup_create_with_port(), but I'm not familiar at all with ports and I wonder what would be the minimal effort to achieve that.
Thank you very much!
Alex
After update XCode to 15, I encountered a crash with UnsafeMutableRawPointer. To recreate the problem I write this simple test code.
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
test()
}
private func test() {
var abl = AudioBufferList()
let capacity = 4096
let lp1 = UnsafeMutableAudioBufferListPointer(&abl)
let outputBuffer1 = UnsafeMutablePointer<Int8>.allocate(capacity: capacity)
let outputBuffer2 = UnsafeMutablePointer<Int8>.allocate(capacity: capacity)
// It crashed here
lp1[0].mData = UnsafeMutableRawPointer(outputBuffer1)
lp1[0].mNumberChannels = 1
lp1[0].mDataByteSize = UInt32(capacity)
lp1[1].mData = UnsafeMutableRawPointer(outputBuffer2)
lp1[1].mNumberChannels = 1
lp1[1].mDataByteSize = UInt32(capacity)
let lp2 = UnsafeMutableAudioBufferListPointer(&abl)
let data = (
UnsafeMutablePointer<Int16>.allocate(capacity: 4096),
packet: 1
)
lp2[0].mData = UnsafeMutableRawPointer(data.0)
}
}
I checked the XCode 15 Release Notes and found out they did something with the pointer default initialization
P1020R1 - Smart pointer creation with default initialization
Is this causing the problem or I'm doing it wrong? Because it work perfectly fine with XCode 14.3.1 and below
P/s: I can't provide the full crash logs cause it's company property but I can provide these:
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Triggered by Thread: 5
Application Specific Information:
stack buffer overflow
Thread 5 name: Dispatch queue: com.apple.NSXPCConnection.user.endpoint
Thread 5 Crashed:
0 libsystem_kernel.dylib 0x20419ab78 __pthread_kill + 8
1 libsystem_pthread.dylib 0x23de0c3bc pthread_kill + 268
2 libsystem_c.dylib 0x1d780c44c __abort + 128
3 libsystem_c.dylib 0x1d77f7868 __stack_chk_fail + 96
Clearly there are something wrong with the memory address after init UnsafeMutableRawPointer from the UnsafeMutablePointer<Int8>
Post not yet marked as solved
hi,
so i have a little bit of work left on the Asus Xonar family of audio devices.
thanks to APPUL's samplepciaudiodriver code and their excellent documentation, Evegeny Gavrilov's kxAudio driver for MAC and Takashi Iwai's exceptional documentation of the ALSA API i have something that is ready for testing.
the stats look good, but unfortunately i this is my second HDAV1.3 deluxe. the other one is also in the same room consuming all of my devices with powered audio outputs.
no matter, i am in the process of acquiring another xonar sound card in this family.
which brings me to my question: what is the benefit of getting an apple developer account for 99 dollars a year? will i be able to distribute a beta kext with my signature that will allow people to test the binary?
i don't think others could run a self-signed kext built on one machine, on another, correct? so would a developer license allow others to test a binary built on my machine, assuming they're x86?
my hope is that the developer program would allow me to test the binaries and solicit input from enthusiast mac pro owners WORLD WIDE.
i them hope to create a new program that will give us the wealth mixers/controls this fantastic line is capable of providing.
Post not yet marked as solved
Hello,
I used kAudioDevicePropertyDeviceIsRunningSomewhere to check if an internal or external microphone is being used.
My code works well for the internal microphone, and for microphones which are connected using a cable.
External microphones which are connected using bluetooth are not reporting their status.
The status is always requested successfully, but it is always reported as inactive.
Main relevant parts in my code :
static inline AudioObjectPropertyAddress
makeGlobalPropertyAddress(AudioObjectPropertySelector selector) {
AudioObjectPropertyAddress address = {
selector,
kAudioObjectPropertyScopeGlobal,
kAudioObjectPropertyElementMaster,
};
return address;
}
static BOOL getBoolProperty(AudioDeviceID deviceID,
AudioObjectPropertySelector selector)
{
AudioObjectPropertyAddress const address =
makeGlobalPropertyAddress(selector);
UInt32 prop;
UInt32 propSize = sizeof(prop);
OSStatus const status =
AudioObjectGetPropertyData(deviceID, &address, 0, NULL, &propSize, &prop);
if (status != noErr) {
return 0; //this line never gets executed in my tests. The call above always succeeds, but it always gives back "false" status.
}
return static_cast<BOOL>(prop == 1);
}
...
__block BOOL microphoneActive = NO;
iterateThroughAllInputDevices(^(AudioObjectID object, BOOL *stop) {
if (getBoolProperty(object, kAudioDevicePropertyDeviceIsRunningSomewhere) !=
0) {
microphoneActive = YES;
*stop = YES;
}
});
What could cause this and how could it be fixed?
Thank you for your help in advance!
Post not yet marked as solved
I am trying to migrate an Audio Unit host based on the AUv2 C API to the newer AUv3 API. While the migration itself was relatively straightforward (in terms of getting it to compile), the actual rendering fails at run-time with error -10876 aka. kAudioUnitErr_NoConnection.
The app does not use AUGraph or AVAudioEngine, perhaps that is an issue? Since the AUv3 and the AUv2 API are bridged in both directions and the rendering works fine with the v2 API, I would expect there to be some way to make it work via the v3 API though.
Perhaps someone has an idea why (or under which circumstances) the render block throws this error?
For context, the app is Mixxx, an open-source DJing application, and here is the full diff between my AUv2 -> v3 migration: https://github.com/fwcd/mixxx/pull/5/files
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I am getting an error in iOS 16. This error doesn't appear in previous iOS versions.
I am using RemoteIO to playback live audio at 4000 hz. The error is the following:
Input data proc returned inconsistent 2 packets for 186 bytes; at 2 bytes per packet, that is actually 93 packets
This is how the audio format and the callback is set:
// Set the Audio format
AudioStreamBasicDescription audioFormat;
audioFormat.mSampleRate = 4000;
audioFormat.mFormatID = kAudioFormatLinearPCM;
audioFormat.mFormatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
audioFormat.mFramesPerPacket = 1;
audioFormat.mChannelsPerFrame = 1;
audioFormat.mBitsPerChannel = 16;
audioFormat.mBytesPerPacket = 2;
audioFormat.mBytesPerFrame = 2;
AURenderCallbackStruct callbackStruct;
// Set output callback
callbackStruct.inputProc = playbackCallback;
callbackStruct.inputProcRefCon = (__bridge void * _Nullable)(self);
status = AudioUnitSetProperty(audioUnit,
kAudioUnitProperty_SetRenderCallback,
kAudioUnitScope_Global,
kOutputBus,
&callbackStruct,
sizeof(callbackStruct));
Note that the mSampleRate I set is 4000 Hz.
In iOS 15 I get 0.02322 seconds of buffer duration (IOBufferDuration) and 93 frames in each callback. This is expected, because:
number of frames * buffer duration = sampling rate
93 * 0.02322 = 4000 Hz
However, in iOS 16 I am getting the aforementioned error in the callback.
Input data proc returned inconsistent 2 packets for 186 bytes; at 2 bytes per packet, that is actually 93 packets
Since the number of frames is equal to the number of packets, I am getting 1 or 2 frames in the callback and the buffer duration is of 0.02322 seconds. This didn't affect the playback of the "raw" signal, but it did affect the playback of the "processed" signal.
number of frames * buffer duration = sampling rate
2 * 0.02322 = 0.046 Hz
That doesn't make any sense. This error appears for different sampling rates (8000, 16000, 32000), but not for 44100. However I would like to keep 4000 as my sampling rate.
I have also tried to set the sampling rate by using the setPreferredSampleRate(_:) function of AVAudioSession, but the attempt didn't succeed. The sampling rate was still 44100 after calling that function.
Any help on this issue would be appreciated.
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“I am trying to monitor sound input on an output device with the lowest possible latency on MAC and iPhone. I would like to know if it is possible to send the input buffer to the output device without having to do it through the callbacks of both processes, that is, as close as possible to redirecting them by hardware. I am using the Core Audio API, specifically AudioQueue Services, to achieve this. I also use HAL for configuration, but I would not like to depend too much on HAL since I understand that it is not accessible from iOS.
Post not yet marked as solved
We've been doing the following in our app for years without issues:
[[NSSound soundSystem:@"Basso"] play]
Suddenly we're seeing hundreds of crashes from macOS 14.0 users and we're not sure what's causing this. There are no memory leaks within the app and all the stack traces are around NSSound:
0 AudioToolbox 0x1f558 MEDeviceStreamClient::RemoveRunningClient(AQIONodeClient&, bool, bool) + 3096
1 AudioToolbox 0x1e8fc AQMEDevice::RemoveRunningClient(AQIONodeClient&, bool) + 108
2 AudioToolbox 0x1e854 AQMixEngine_Base::RemoveRunningClient(AQIONodeClient&, bool) + 76
3 AudioToolbox 0xcdd78 AudioQueueObject::StopRunning(AQIONode*, bool) + 244
4 AudioToolbox 0xcbdd0 AudioQueueObject::Stop(bool, bool, int*) + 736
5 AudioToolbox 0xf1840 AudioQueueXPC_Server::Stop(unsigned int, bool) + 172
6 AudioToolbox 0x1418b4 ___ZN20AudioQueueXPC_Bridge4StopEjb_block_invoke + 72
7 libdispatch.dylib 0x3910 _dispatch_client_callout + 20
8 libdispatch.dylib 0x130f8 _dispatch_sync_invoke_and_complete_recurse + 64
9 AudioToolbox 0x141844 AudioQueueXPC_Bridge::Stop(unsigned int, bool) + 184
10 AudioToolbox 0xa09b0 AQ::API::V2Impl::AudioQueueStop(OpaqueAudioQueue*, unsigned char) + 492
11 AVFAudio 0xbe12c AVAudioPlayerCpp::disposeQueue(bool) + 188
12 AVFAudio 0x341dc -[AudioPlayerImpl dealloc] + 72
13 AVFAudio 0x358a0 -[AVAudioPlayer dealloc] + 36
14 AppKit 0x1b13b4 -[NSAVAudioPlayerSoundEngine dealloc] + 44
15 AppKit 0x1b132c -[NSSound dealloc] + 164
16 libobjc.A.dylib 0xf418 AutoreleasePoolPage::releaseUntil(objc_object**) + 196
17 libobjc.A.dylib 0xbaf0 objc_autoreleasePoolPop + 260
18 CoreFoundation 0x3c57c _CFAutoreleasePoolPop + 32
19 Foundation 0x30e88 -[NSAutoreleasePool drain] + 140
20 Foundation 0x31f94 _NSAppleEventManagerGenericHandler + 92
21 AE 0xbd8c _AppleEventsCheckInAppWithBlock + 13808
22 AE 0xb6b4 _AppleEventsCheckInAppWithBlock + 12056
23 AE 0x4cc4 aeProcessAppleEvent + 488
24 HIToolbox 0x402d4 AEProcessAppleEvent + 68
25 AppKit 0x3a29c _DPSNextEvent + 1440
26 AppKit 0x80db94 -[NSApplication(NSEventRouting) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 716
27 AppKit 0x2d43c -[NSApplication run] + 476
28 AppKit 0x4708 NSApplicationMain + 880
29 ??? 0x180739058 (Missing)
Hi all,
Apple dropping on-going development for FireWire devices that were supported with the Core Audio driver standard is a catastrophe for a lot of struggling musicians who need to both keep up to date on security updates that come with new OS releases, and continue to utilise their hard earned investments in very expensive and still pristine audio devices that have been reduced to e-waste by Apple's seemingly tone-deaf ignorance in the cries for on-going support.
I have one of said audio devices, and I'd like to keep using it while keeping my 2019 Intel Mac Book Pro up to date with the latest security updates and OS features.
Probably not the first time you gurus have had someone make the logical leap leading to a request for something like this, but I was wondering if it might be somehow possible of shoe-horning the code used in previous versions of Mac OS that allowed the Mac to speak with the audio features of such devices to run inside the Ventura version of the OS.
Would it possible? Would it involve a lot of work? I don't think I'd be the only person willing to pay for a third party application or utility that restored this functionality.
There has to be 100's of thousands of people who would be happy to spare some cash to stop their multi-thousand dollar investment in gear to be so thoughtlessly resigned to the scrap heap.
Any comments or layman-friendly explanations as to why this couldn’t happen would be gratefully received!
Thanks,
em
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Hi community
I'm developing an application for MacOS and i need to capture the mic audio stream. Currently using CoreAudio in Swift i'm able to capture the audio stream using IO Procs and have applied the AUVoiceProcessing for prevent echo from speaker device. I was able to connect the audio unit and perform the echo cancellation.
The problem that i'm getting is that when i'm using AUVoiceProcessing the gain of the two devices get reduced and that affects the volume of the two devices (microphone and speaker).
I have tried to disable the AGC using the property kAUVoiceIOProperty_VoiceProcessingEnableAGCbut the results are the same.
There is any option to disable the gain reduction or there is a better approach to get the echo cancellation working?
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Here is the process in My application.Mic -> AVCaptureOutput -> Audio(PCM) -> Audio Encoder -> AAC Packet (Encoded)Camera -> AVCaptureOutput -> Image -> Video Encoder -> H.264 Video Packet.(Encoded)So, My App is Movie Encoder.Crash is happened when camera is switched. (Front Camera <-> Back Camera)Crash line is AudioConverterFillComplexBuffer.maybe NativeInt16ToFloat32Scaled_ARM..what does that mean??? why???0 AudioCodecs 0x0000000183fbe2bc NativeInt16ToFloat32Scaled_ARM + 1321 AudioCodecs 0x0000000183f63708 AppendInputData(void*, void const*, unsigned int*, unsigned int*, AudioStreamPacketDescription const*) + 562 AudioToolbox 0x000000018411aaac CodecConverter::AppendExcessInput(unsigned int&) + 1963 AudioToolbox 0x000000018411a59c CodecConverter::EncoderFillBuffer(unsigned int&, AudioBufferList&, AudioStreamPacketDescription*) + 6604 AudioToolbox 0x0000000184124ec0 AudioConverterChain::RenderOutput(CABufferList*, unsigned int, unsigned int&, AudioStreamPacketDescription*) + 1165 AudioToolbox 0x0000000184100d98 BufferedAudioConverter::FillBuffer(unsigned int&, AudioBufferList&, AudioStreamPacketDescription*) + 4446 AudioToolbox 0x00000001840d8c9c AudioConverterFillComplexBuffer + 3407 MovieEncoder 0x0000000100341fd4 __49-[AACEncoder encodeSampleBuffer:completionBlock:]_block_invoke (AACEncoder.m:247)
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Dear Sirs,
I'm trying to find a way to save and restore some settings of an Audio Server Plugin so that they will be available again after a reboot. I came across the functions WriteToStorage and CopyFromStorage which seem to work correct but after a reboot my settings seem to be gone. Am I doing something wrong and normally this storage should survive a reboot or is this not the intended way to have persistent settings. What would be the recommended way if I want to use these settings right from the start before and user mode app is started?
Thanks and best regards,
Johannes
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by defect auv3 extensions use objective-c for the dsp part can i use swift instead?
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That is, will my render callback ever be called after AudioOutputUnitStop() returns?In other words will it be safe to free resources used by the render callback or do I need to add realtime safe communication between the stopping thread and the callback thread?This question is intended for both macOS HAL Output and iOS Remote IO output units.
Hello,
I am using Core Audio to output a sine wave at a constant frequency (256Hz). The problem I have is that the sound starts very nice and pure, but gets distored over time - feels like there is some sort of a cumulative error which gets worse as the time goes by.
I am using AudioDeviceCreateIOProcID to create a callback, in which I populate the buffer with samples. I only have a single buffer, because my samples are interleaved. Buffer size is always constant (12800 bytes). Samples are floats (from -1 to 1).
Here is what I tried to identify the reasons for distortion:
I validated that each subsequent callback starts generating samples with the proper phase i.e. the one at which the previous callback ended. E.g. if the last sample from previous callback was 0.8f, then the first callback in next callback is going to be 0.82f as expected.
I was wondering if maybe hardware plays the buffer when I am filling it, so I even used mutex to lock the buffer as I am writing to it, but it did not do anything at all. This probably means that the buffer that is passed to callback by OS is already safe to write to.
I inspected AudioStreamBasicDescription, buffer size and how many bytes I write to the buffer - it all matches my expectations.
Any ideas on what might be causing this sound distortion over time?
Post not yet marked as solved
Hi!
I am working on an audio application on iOS. This is how I retreive the workgroup from the remoteIO audiounit (ioUnit). The unit is initialized and is working fine (meaning that it is regularly called by the system).
os_workgroup_t os_workgroup{nullptr};
uint32_t os_workgroup_index_size;
if (status = AudioUnitGetProperty(ioUnit, kAudioOutputUnitProperty_OSWorkgroup, kAudioUnitScope_Global, 0,
&os_workgroup, &os_workgroup_index_size);
status != noErr)
{
throw runtime_error("AudioUnitSetProperty kAudioOutputUnitProperty_OSWorkgroup - Failed with OSStatus: " +
to_string(status));
}
However the resulting os_workgroup's value is 0x40. Which seems not correct. No wonder I cannot join any other realtime threads to the workgroup as well. The returned status however is a solid 0.
Can anyone help?
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I'm very excited about the new AirTag product and am wondering if there will be any new APIs introduced in iOS 14.5+ to allow developers to build apps around them outside the context of the Find My network?
The contexts in which I am most excited about using AirTags are:
Gaming
Health / Fitness-focused apps
Accessibility features
Musical and other creative interactions within apps
I haven't been able to find any mention of APIs. Thanks in advance for any information that is shared here.
Alexander
djflux.
