Re: AudioQueueNewOutput and the runloop
Re: AudioQueueNewOutput and the runloop
- Subject: Re: AudioQueueNewOutput and the runloop
- From: patrick machielse <email@hidden>
- Date: Mon, 22 Oct 2012 22:23:00 +0200
I'm still bitten by this issue:
> In my (iOS) application I use an AudioQueue. It is created like this:
>
> AudioQueueNewOutput(&asbd, queueCallback, (__bridge void *)self, NULL, kCFRunLoopCommonModes, 0, &newQueue);
>
>
> in 'queueCallback', eventually AVAssetReader is used to decode frames from an audio file
>
> CMSampleBufferRef nextBuffer = [output copyNextSampleBuffer];
>
>
> Sometimes this call hangs:
>
> Thread 21 AQClient, Queue : (null)
> #0 0x3a0bdeb4 in mach_msg_trap ()
> #1 0x3a0be04c in mach_msg ()
> #2 0x38043044 in __CFRunLoopServiceMachPort ()
> #3 0x38041da2 in __CFRunLoopRun ()
> #4 0x37fb4ebc in CFRunLoopRunSpecific ()
> #5 0x37fb4d48 in CFRunLoopRunInMode ()
> #6 0x3842e658 in -[AVRunLoopCondition _waitInMode:untilDate:] ()
> #7 0x383e49b8 in -[AVAssetReaderOutput copyNextSampleBuffer] ()
>
> Is there any connection between the runloop of the main thread and the runloop configuration of the AudioQueue that might explain this?
>
> Could I configure my queue in AudioQueueNewOutput() in a different way?
I'd be grateful if anyone can speculate on _why_ -[AVAssetReaderOutput copyNextSampleBuffer] might sometimes hang in CFRunLoopRunInMode when called on an audioqueue callback.
Thanks,
patrick
--
Patrick Machielse
Hieper Software
http://www.hieper.nl
email@hidden
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Coreaudio-api mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden