Re: iOS : ExtAudioFileWriteAsync alternatives / Audio Queue Services availability?
Re: iOS : ExtAudioFileWriteAsync alternatives / Audio Queue Services availability?
- Subject: Re: iOS : ExtAudioFileWriteAsync alternatives / Audio Queue Services availability?
- From: Arshia Cont <email@hidden>
- Date: Wed, 14 Feb 2018 23:02:56 +0100
Huh.. Just needed some one else to say it.. back to basics.. :)
Thanks Matt for taking time to reply.
Sent from my iPhone
> On 14 Feb 2018, at 21:31, Matt Ingalls <email@hidden> wrote:
>
> OK I see what you are doing now.
>
> Sounds like increasing kExtAudioFileProperty_IOBufferSizeBytes could prevent
> an overflow.
> but maybe doing your own async writes would be safer :). ExtAudioFile is a
> pretty old API..
>
> -m
>
>> On Feb 14, 2018, at 11:24 AM, Arshia Cont <email@hidden> wrote:
>>
>> Matt,
>>
>> Thanks for the reply! :)
>>
>> AVAudioFile would be one way to go except that I am recording live streams,
>> and using AVAudioFile I should make the ‘write’ asynchronous myself and make
>> sure the direct-to-disk stuff won’t hic the AudioIO thread.
>>
>> This is supposed to be the promise of ‘ExtAudioFileWriteAsync’.
>>
>> Has anyone tried playing around with the
>> kExtAudioFileProperty_IOBufferSizeBytes property of Extended Audio File
>> Services? I have feeling that this is the way to go (increasing the buffer
>> so that writing would occur less frequently.
>>
>> Apparently the kExtAudioFileError_AsyncWriteBufferOverflow is thrown when
>> write requests are arriving faster than the system’s ability to access disk
>> (can happen at any time and all of a sudden). The bad news is that when this
>> is thrown it actually halts the IOThread! Can’t figure out why… .
>>
>> Hint that can help: I am recording two live streams (stereo) at the same
>> time (i.e. two audio files).
>>
>> Any hints?
>>
>>> On 14 Feb 2018, at 19:01, Matt Ingalls <email@hidden> wrote:
>>>
>>> Have you tried AVAudioFile?
>>>
>>>> On Feb 13, 2018, at 12:59 PM, Arshia Cont <email@hidden> wrote:
>>>>
>>>> Hello list,
>>>>
>>>> This is my first post here so sorry if this is already asked!
>>>>
>>>> We have been using ExtAudioFileWriteAsync on iOS successfully to write two
>>>> PCM Audio Streams to disk. We have been getting reports from users nagging
>>>> on sudden audio drop outs on some [older] devices and during
>>>> “performance”. We managed finally to find the root of the problem to the
>>>> thrown kExtAudioFileError_AsyncWriteBufferOverflow exception which means
>>>> (probably?) that ExtAudioFileWriteAsync is not keeping the pace with the
>>>> system writing to disk.
>>>>
>>>> So I believe we must use lower level calls here (?).
>>>>
>>>> What would be an alternative for ExtAudioFileWriteAsync?
>>>
>>>>
>>>> I have been looking at Audio Queue Services for months but
>>>> documentation/examples are so old that it keeps me away from it… or should
>>>> we dive in?
>>>>
>>>> Thanks in advance,
>>>>
>>>>
>>>> Arshia Cont
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>
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