Re: ExtAudioFileWriteAsync- skip on write?
Re: ExtAudioFileWriteAsync- skip on write?
- Subject: Re: ExtAudioFileWriteAsync- skip on write?
- From: Art Gillespie <email@hidden>
- Date: Thu, 1 Jul 2010 15:00:22 -0700
> Are you calling ExtAudioFileWriteAsync from within
> the render callback and it works fine?
Yes, though I don't have a 3G handy to test with. (Works fine on 3GS and 4.)
> In other words, I should have
> to create my own writer thread?
No, there's already an internal thread with ExtAudioFileWriteAsync.
>From the comments at ExtendedAudioFile.h:456
"Writes the provided buffer list to an internal ring buffer and
notifies an internal thread to perform the write at a later time."
On Thu, Jul 1, 2010 at 2:33 PM, Jonathan <email@hidden> wrote:
> - Hardware/OS: iPhone 3G (3.1.3)
> - Yep, I'm calling ExtAudioFileWriteAsync outside the render callback.
> - ExtAudioFileRef is passed via a struct to the render callback
>
> As far as the memory warning goes, I'll have to check that out. I
> wanted to reply right away, though, to verify something I think your
> message implies. Are you calling ExtAudioFileWriteAsync from within
> the render callback and it works fine? In other words, I should have
> to create my own writer thread?
>
> On Thu, Jul 1, 2010 at 2:27 PM, Art Gillespie <email@hidden> wrote:
>> I'm not seeing this here.
>>
>> * What hardware/OS version are you experiencing this with?
>> * Are you calling ExtAudioFileWriteAsync once *outside* the render
>> callback with 0 frames and NULL buffers to prime the internal ring
>> buffer?
>> * How are you synchronizing access to the ExtAudioFileRef?
>> * Do you get a memory warning at any point during the writing?
>>
>> Best,
>>
>> Art
>>
>> On Thu, Jul 1, 2010 at 9:57 AM, Jonathan <email@hidden> wrote:
>>> Hey guys,
>>>
>>> I'm still having an issue with ExtAudioFileWriteAsync causing skipping
>>> periodically on an iPhone. Isn't ExtAudioFileWriteAsync supposed to
>>> handle buffering, etc? I'm sure that the actual writes could cause
>>> some blocking, so I did move the function out of the render notify
>>> callback and into a writer thread, but the audio still skips every
>>> minute or so (presumably when the data is actually write to disk).
>>
>
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