realtime analysis means that you are limited to processing the audio as it flows through the plugin. you cannot read ahead, or behind, you cannot change the amount of data you receive or the rate at which you receive it. your methods must be realtime safe.
non-realtime analysis means, in practice, that you are given a file or fixed buffer with all the data in it, and you can process it in any order, and chunk sizes you want, using any algorithms you feel like. On Thu, Apr 2, 2015 at 6:30 PM, Kevin Callahan <kc...@mac.com> wrote: > > On Apr 2, 2015, at 3:22 PM, Paul Davis <p...@linuxaudiosystems.com> wrote: > > aubio is a common starting point for open source pitch detection, as is > the CLAM project. however, my impression is that to do it well, you want > non-realtime analysis, which means that normal AU's are not ideal. the VAMP > plugin suite is another open source API and set of plugins specifically > designed for non-realtime analysis. > > please don't use these sources if you intend to write proprietary software > (though of course, nothing is going to stop you). > > > When you speak of real-time analysis, would guitar tuners be an example? > I’m not making a guitar tuner, but that’s the sort of thing I need to do. > > > On Thu, Apr 2, 2015 at 5:30 PM, Kevin Callahan <kc...@mac.com> wrote: > >> I’m writing an iOS app in Swift (will also write a Mac version later) and >> would like to add pitch detection. Is there an open-source project that >> does frequency pitch detection? Would I use AVAudioSession to capture the >> audio, then drop down into CoreAudio to do the pitch detection? >> >> In my initial research, I’ve learned there are many algorithms and ways >> to go about doing pitch detection - each having strengths and weaknesses. >> >> Can someone please point me in the best direction to get started? >> >> Thanks, >> -K >> _______________________________________________ >> 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/paul%40linuxaudiosystems.com >> >> This email sent to p...@linuxaudiosystems.com > > >
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