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