Re: C AudioUnit
Re: C AudioUnit
- Subject: Re: C AudioUnit
- From: Brian Willoughby <email@hidden>
- Date: Sun, 31 Jan 2016 14:41:28 -0800
I'm fairly certain that there are no examples of a plain C AudioUnit. There has been much talk over the decades about the possibilities, but I do not recall anyone ever completing the task, much less sharing their results.
If you have very little C++ experience, then you have no hope of converting the existing C++ examples into plain C, even though it is theoretically possible.
You mention Swift, and I'd say that is the language you should avoid when writing an AudioUnit. Stick with the C++ examples for AudioUnits, and learn enough about C++ to add your member variables in the right places, and implement your very simple processing in the Render() function. This will get you the furthest with minimal effort.
You don't really need to design any new C++ classes to implement a simple AudioUnit. But you will need to have a reasonable understanding of a couple of the classes in the AudioUnit example code. That's because some of your variables might be shared across all channels (such as filter coefficients), while other variables will surely be specific to a single channel (such as filter state). e.g., I wrote some dynamics processing AudioUnits, and I needed to make the overall volume the same for all channels, particularly for stereo and surround instances of my plugin. Those variables are declared in a different object than the channel object.
If you want to use Swift in a full application, that's fine, but remember that AudioUnits are plugin components. You're probably going to find it more difficult to implement an AudioUnit with mixed C++/Swift than either pure C++ or even plain C.
Brian Willoughby
Sound Consulting
On Jan 31, 2016, at 1:08 PM, Charles Constant <email@hidden> wrote:
> Does anyone know of any sample code for an AudioUnit written in plain C (as opposed to C++, or Obj-C)? ...assuming that is even possible.
>
> The most relevant references I've found, so far, for what I need to do are Apple's "AUBase.cpp" and "ReverseOfflineUnitVersion.cpp" examples. I have very little C++ experience, and have no idea how I could implement this in C.
>
> I realize C++ is "the" choice writing AudioUnits. However (a) the AudioUnit I need to write is very simple (not much more than an offline mixer) (b) I can reuse some code from my existing C render procs (c) C++ would add extra time for me to get up to speed with a mixed C++/Swift project. My guess is that plain C would work better in my current project, if there's some sample code of a pure C AudioUnit.
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| | >C AudioUnit (From: Charles Constant <email@hidden>) |