Re: iOS 4.1: using AVAssetReader to stream from an audio file interrupts audio callback
Re: iOS 4.1: using AVAssetReader to stream from an audio file interrupts audio callback
- Subject: Re: iOS 4.1: using AVAssetReader to stream from an audio file interrupts audio callback
- From: Paul Davis <email@hidden>
- Date: Mon, 1 Nov 2010 21:41:49 -0400
On Mon, Nov 1, 2010 at 7:05 PM, Nikolai Collinsky
<email@hidden> wrote:
> OK, turns out the iPhone developer forums have a bit more information. Just posting here to help anyone hunting for information and seeing this thread.
>
> The solution in my case was a one liner; make sure:
>
> status = AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers, sizeof (UInt32), &(UInt32) {1});
>
> was established alongside setting up kAudioSessionCategory_MediaPlayback.
>
> So it is possible to stream directly from the iPod Library without prior file copy and with a background producer/consumer thread. BBCut now works with this 4.1 AVAssetReader.
I don't know much about what you're doing or using, but in case you
are not aware of this, you cannot plan on doing filesystem I/O from
within the audio callback. if that's not relevant and/or not the
problem, i apologize for butting in. if it is related, you need to use
a lock-free ringbuffer between the thread doing filesystem i/o and the
audio callback thread.
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