Unfortunately the AU Examples do not contain all of Apple's AU utility files. They just provide enough of the utility classes to get the examples going. So, while the examples are definitely essential to learning the different aspects of AU development, they do not cover the less-common types, such as MusicDevice. Here is a link to the full set of utility files:
https://developer.apple.com/library/ios/samplecode/CoreAudioUtilityClasses/Introduction/Intro.html If you look in there you will find MusicDeviceBase.h. These files are NOT part of the AudioUnit related frameworks installed on both iOS and OS X. I think they used to be installed by installing the Apple developer tools but were moved out of the installation years ago, being made available for downloading separately. Brian's comment about not inheriting from AUBase directly is 100% true. That said it is worthwhile to look at what is happening under the hood, especially with respect to the different AU types... If you dig a little deeper you will see how the inheritance hierarchy of MusicDevice determines what AU features it's children support. It inherits from AUBase, which gives all the essential implementations and then inherits from AUMIDIBase, which adds some added MIDI handling capabilities. I would look at the template-based Factory method in ComponentBase.h and AUMusicLookup::Lookup() in AUPluginDispatch.cpp to get familiar with AU types and the Apple-provided inheritance hierarchy. Finally, Apple have recently released a new v3.0 audio unit API. Most likely the above semantics have changed, but I haven't had time to investigate the precise differences. It is definitely worth a look and has probably simplified some of the development aspects you are currently encountering in this thread. --Christian On Sun, Sep 20, 2015 at 12:40 PM, Steven Brawer < [email protected]> wrote: > MusicDevice.h is not a class, nor are any classes named MusicDevice (or > MusicDeviceBase) declared in this file, nor does it include or reference > MusicDeviceBase. Rather, besides C-structs and some other definitions, this > file contains only calls to C functions (externs). Also, this file (and > others) has LOTS of documentation (uncharacteristic). > > So, perhaps Apple is providing in these frameworks a set of functions to > use. I think I did read somewhere that Apple was overhauling Core Audio, so > maybe this is it. Perhaps now one is expected to roll one’s own classes, or > Apple will (has already???) come up with some classes. > > I will check out the downloads and compare the C functions to the .cpp > files of the older frameworks. > > Thanks > > Steve > > > On Sep 20, 2015, at 12:18 PM, Jim Credland <[email protected]> > wrote: > > Download the samples here (see Download button at the top): > > > https://developer.apple.com/library/mac/samplecode/sc2195/Introduction/Intro.html > > Should have everything you need unless anyone knows a newer version. > > On 20 Sep 2015, at 17:12, Steven Brawer < > [email protected]> wrote: > > I have added the following frameworks to a project: CoreMIDI, CoreAudio, > CoreAudioKit, AudioToolbox, AudioUnit (XCode 7, OSX10.10.5). These were > downloaded when I upgraded the OS and XCode, and are in > System/Library/Frameworks, all dated with the date of my upgrade of OSX. > > All I see in the project are headers. > > There is a MusicDevice.h, but no MusicDeviceBase.h. There are no > AUEffect….. .h of any kind. Am I missing a framework, have things changed > considerably, or am I supposed to be using other frameworks that were not > downloaded? > > Thanks > > Steve > > > On Sep 19, 2015, at 6:15 PM, Brian Willoughby <[email protected]> > wrote: > > Yes. AUEffectBase handles one input stream to one output stream. All the > classes like AUInlineEffectBase and AUMIDIEffectBase that inherit from > AUEffectBase have the same assumptions. At the moment, I can't remember > whether additional streams require moving away from AUEffectBase or if > there are easy ways to adapt it. I do recall that I never finished my > side-chain effect that requires a second input stream. > > You're on the right track with MusicDeviceBase. If you search for that > class, you'll probably find more help getting started in that area. Synths > are a bit more rare than effects that have audio input, so you might have > to search a little further. > > Of course, the rarest plug-in is a synth that also accepts input audio for > any reason - whether side-chain, modulation, envelope tracking, etc. > > Brian Willoughby > > > On Sep 19, 2015, at 2:50 PM, Steven Brawer < > [email protected]> wrote: > > Thank you so much. This is really a big help. I am planning a plug-in > synth to generate audio, so I will start with MusicDeviceBase and plow on > from there. > > If a class name includes the word “Effect”, would it be for an effect > plug-in and not a synth plug-in? (That is, such a class expects a stream > input at the very least.) > > Steve > > > On Sep 19, 2015, at 5:33 PM, Brian Willoughby <[email protected]> > wrote: > > Ultimately, it's AUBase. > > However, you're most likely to use something like AUEffectBase, > AUInlineEffectBase, MusicDeviceBase, or AUMIDIEffectBase (which > incorporates AUMIDIBase). > > It's very difficult to work directly with AUBase unless you understand how > to provide everything required. The subclasses are there to provide the > general stuff for nearly all possibilities. > > If you have a synthesis plug-in, i.e. one that generates audio, then start > with MusicDeviceBase. If you have a standard effect, AUEffectBase is the > most common - one stream in, one stream out, any number of channels. There > are a few effects where AUInlineEffectBase makes sense, but it may not > always be easy to know when to choose it over AUEffectBase. > AUMIDIEffectBase combines AUEffectBase and AUMIDIBase, but I don't believe > that there are any base classes which combine MusicDeviceBase and > AUEffectBase, but I can't recall if there are actually any valid scenarios > where that would be needed. > > Brian Willoughby > Sound Consulting > > On Sep 19, 2015, at 1:29 PM, Steven Brawer < > [email protected]> wrote: > > What is the Core-Audio base class for creating a logic pro plug-in? > > > > > _______________________________________________ > Do not post admin requests to the list. 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