Re: Communicate with AudioUnit from C program?
Re: Communicate with AudioUnit from C program?
- Subject: Re: Communicate with AudioUnit from C program?
- From: Paul Davis <email@hidden>
- Date: Fri, 30 Mar 2018 12:43:09 -0400
Sorry, that's not really feasible. I wasn't citing Ardour as a sensible
place to find example code - it's a huge program. I was just citing as
proof that using AU's in a command-line GUI-less application works fine.
If you really want to look, libs/ardour/audio_unit.cc is where 99% of our
interaction with the DSP side of an AU plugin happens, but I still don't
think you'll find it easy to locate the stuff you want.
On Fri, Mar 30, 2018 at 12:08 PM, Igor Clark <email@hidden> wrote:
> Hey, thanks Paul, that's great. I'm looking at the Ardour Github repo now,
> obviously it's pretty large - would you be able to point me to any
> particularly relevant parts to dig into? Especially where the MIDI aspects
> are concerned?
>
> Cheers!
>
>
> On 30/03/2018 15:22, Paul Davis wrote:
>
> The "headless" version of Ardour (all the functionality, no GUI) certainly
> does this. Its not a problem. We don't use XCode or any Apple tools except
> their somewhat ancient "utility libs" which are just wrappers around AU to
> make it slightly more C++ idiomatic.
>
> On Fri, Mar 30, 2018 at 9:10 AM, Igor Clark <email@hidden> wrote:
>
>> Hi all,
>>
>> Is it possible to load an existing AudioUnit MIDI plugin and interact it
>> with it from a CLI program written in C? I'd like to be able to use
>> commercial plug-ins in my MIDI processing app.
>>
>> I'm comfortable with how to communicate between C & C++ using 'extern'
>> etc, so that's not the main issue. Rather, I'm wondering whether it's
>> possible to have a C CLI app that loads the AU and sends MIDI passages to
>> it, so that the AU processes the data (ideally async) and then returns its
>> result back to the C app. I guess it's effectively writing an AU host app,
>> but does that all have to be done in Xcode, or is it possible to do it as a
>> straight C/C++ program using clang/llvm at the shell?
>>
>> Also, the AU Hosting Guide docs
>> <https://developer.apple.com/library/content/documentation/MusicAudio/Conceptual/AudioUnitHostingGuide_iOS/Introduction/Introduction.html>
>> talk about I/O, Mixer and Effect units - is there any other material that
>> focuses on how to do MIDI in AU? Or is a adaptor/translator layer necessary?
>>
>> Thanks for any pointers,
>> Igor
>>
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