Thanks Arshia! Really appreciate your pointers. That's great news. By the way, do you use Swift or OBjC with AVAudioEngine?
Thanks, Beinan On Fri, Aug 2, 2019 at 5:40 PM Arshia Cont <arshiac...@antescofo.com> wrote: > Beinan, > > This is my understanding of the situation talking to some of the CoreAudio > people at this year’s WWDC and following the recent evolution. Ofcourse it > all depends on what you’re currently doing with CoreAudio so my input is > biased on my needs which are low-latency real-time Audio I/O. > > AuGraph is officially marked as Deprecated starting iOS 13 (and > Catalina?). AVAudioEngine seems to be ready to provide the move. For my > concerns, it wasn’t still ready until the current Beta (again for > low-latency real-time audio). With the addition of the AVAudioSinkNode and > AVAudioSourceNode, AVAudioEngine can cope with what AUnit and AUGRAPH could > do on low-latency situations. In your case and from your description, you > should have a look at AVAudioSourceNode. > Here is what you need: > https://developer.apple.com/videos/play/wwdc2019/510/ > > It also seems like your deprecated warnings are much older than what I > describe above! I’ve been using AUnit and AuGraph until now without problem > removing Canonical (and other) deprecated stuff as they appeared. So if > you’re targeting iOS 12, you can still stay on older CoreAudio APIs. But > you might wanna start shopping on AVAudioEngine as it’s gonna be time to > move soon after adoption of Catalina/iOS13 in a few months. > > Any further insight from other users would be welcome. I’m going to start > testing the Sink and Source nodes for real-time use soon. > > Cheers, > > > Arshia Cont > www.antescofo.com > > > On 2 Aug 2019, at 11:01, Beinan Li via Coreaudio-api < > coreaudio-api@lists.apple.com> wrote: > > Hello CoreAudio, > > I'm seeking advice on migrating from CoreAudio/ObjC++ to > AVAudioEngine/Swift/ObjC: should I do it or when should I start worry? > > I have a legacy macOS/iOS project that uses CoreAudio heavily, mainly just > AudioQueue, but right now on Mojave / iOS 12 things start to breakdown or > throw "deprecated" warnings at me, e.g.: > > AudioSampleType is deprecated: The concept of canonical formats is > deprecated. > > And I need to at least bring in AVFoundation. This prompts me to shop > around for other solutions. > > My project is not a synth/FX app. It would only use metering/spectrogram > and some visualization at best. Low-latency is essential though. The info > about latest CoreAudio stack on the internet seems increasingly scarce and > I'm hesitating to adopt 3rd-party frameworks such as JUCE for such a small > project. So I'd love to give the Swift stack or even just ObjC/C stack a > serious try. > > Now my concern is mainly in the performance and latency. I've seen these > posts regarding using AVAudioEngine: > > > https://stackoverflow.com/questions/1877410/whats-the-difference-between-all-these-audio-frameworks > > > https://stackoverflow.com/questions/26115626/i-want-to-call-20-times-per-second-the-installtaponbusbuffersizeformatblock/26600077#26600077 > > > https://stackoverflow.com/questions/45644079/performance-between-coreaudio-and-avfoundation > > It seems there aren't a lot of agreements on whether or not the Swift > stack could achieve low-latency using its AU wrapper. Some says that the > performance is 30-40% worse than the CoreAudio stack. But there is also a > positive report: > > > https://stackoverflow.com/questions/45644079/performance-between-coreaudio-and-avfoundation > > Before I dive into a whole new world (Swift newbie), any suggestions from > the list would be greatly appreciated! > > > > Thanks, > Beinan > > _______________________________________________ > 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/arshiacont%40antescofo.com > > This email sent to arshiac...@antescofo.com > > >
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