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 <arshiac...@antescofo.com> 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 <m...@8dio.com> wrote: >> >> Have you tried AVAudioFile? >> >>> On Feb 13, 2018, at 12:59 PM, Arshia Cont <arshiac...@antescofo.com> 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 >>> _______________________________________________ >>> Do not post admin requests to the list. They will be ignored. >>> Coreaudio-api mailing list (Coreaudio-api@lists.apple.com) >>> Help/Unsubscribe/Update your Subscription: >>> https://lists.apple.com/mailman/options/coreaudio-api/matt%408dio.com >>> >>> This email sent to m...@8dio.com >> > _______________________________________________ Do not post admin requests to the list. They will be ignored. Coreaudio-api mailing list (Coreaudio-api@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/coreaudio-api/archive%40mail-archive.com This email sent to arch...@mail-archive.com
