Thank you very much Christian.
Correctly setting kNumberOfParameters to 1 now allows the Audio Unit to get to
the "render” stage of AUVal without crashing - haha.
Will check out SetParameter - in the example TremoloUnit it is used with two
arguments like so:
SetParameter (
kParameter_Frequency,
kDefaultValue_Tremolo_Freq
);
SetParameter (
kParameter_Depth,
kDefaultValue_Tremolo_Depth
);
SetParameter (
kParameter_Waveform,
kDefaultValue_Tremolo_Waveform
);
> On 23 May 2015, at 04:04, Christian Rober <[email protected]> wrote:
>
> Without testing it, your constructor seems to be throwing an exception (Open
> is a dispatched call to your constructor that catches any exceptions and
> returns them as normal OSStatus errors, see ComponentBase.cpp). The
> exception looks like it wraps an invalid parameter error (10878, seen in
> AUComponent.h).
>
> I think this exception is being thrown in your call to SetParameter. My
> first thought is that your kNumberOfParameters is set to 0. With no
> parameters reserved, trying to set one will throw that exact error/exception
> above.
>
> The other part of this is that you are accidentally calling SetParameter on
> AUBase/YourClass and not the global scope. Though, from the code you shared,
> I don't even know how a 2 parameter SetParameter call to the base class would
> even compile.
>
> I imagine the constructor body should look more like this:
>
> Hardgainer::Hardgainer (AudioUnit component) : AUEffectBase (component) {
> CreateElements ();
> Globals () -> UseIndexedParameters (kNumberOfParameters); // <-- Should
> be non-zero
> Globals () -> SetParameter (
> kParameter_Gain,
> kDefaultValue_Gain
> ); // <-- Need more
> arguments if calling AUBase::SetParameter.
> ….
>
> Note: The indexed parameter gets created in global scope by setting it on the
> global element first. Only after this initial global setting can it be
> safely used by the AU.
>
> --Christian
>
>
> On Fri, May 22, 2015 at 7:38 PM, Farhan Mannan <[email protected]
> <mailto:[email protected]>> wrote:
> I have used the current audio unit tutorial (1) with a bit of tinkering to
> create an Xcode project (2) that successfully builds a component but I can’t
> get it to validate. AUVal gives me error -10878. (3)
>
> I started in Xcode from the 'OS X > System Plug-in > Generic C++ plugin’
> template and copied all the methods in the tutorial for making the sample
> audio unit (TremoloUnit) as well as a couple of methods that were in the
> downloadable sample audio unit that seemed necessary to get it to build -
> essentially trying to mimic the mythical audio unit template that the guide
> refers to, but which is no longer available in Xcode and has been unavailable
> for some time.
>
> I think I have ended up implementing a version of every method in the sample
> audio unit so I’m now stuck as to why it doesn’t validate. I understand that
> the DSP code may be totally useless (it’s only meant to be a gain plugin) but
> the thing won’t even open.
>
> Any suggestions?
>
> Even if this project isn’t salvageable in its current form, is there another
> way I can go about starting to write audio units?
>
> (1)
> https://developer.apple.com/library/mac/documentation/MusicAudio/Conceptual/AudioUnitProgrammingGuide/TheAudioUnit/TheAudioUnit.html#//apple_ref/doc/uid/TP40003278-CH12-SW1
>
> <https://developer.apple.com/library/mac/documentation/MusicAudio/Conceptual/AudioUnitProgrammingGuide/TheAudioUnit/TheAudioUnit.html#//apple_ref/doc/uid/TP40003278-CH12-SW1>
>
> (2) https://github.com/farhanmannan/hardgainer
> <https://github.com/farhanmannan/hardgainer>
>
> (3) https://gist.github.com/farhanmannan/d5a83910d0b2f18840c1
> <https://gist.github.com/farhanmannan/d5a83910d0b2f18840c1>
> _______________________________________________
> Do not post admin requests to the list. They will be ignored.
> Coreaudio-api mailing list ([email protected]
> <mailto:[email protected]>)
> Help/Unsubscribe/Update your Subscription:
> https://lists.apple.com/mailman/options/coreaudio-api/recapitch%40gmail.com
> <https://lists.apple.com/mailman/options/coreaudio-api/recapitch%40gmail.com>
>
> This email sent to [email protected] <mailto:[email protected]>
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Coreaudio-api mailing list ([email protected])
Help/Unsubscribe/Update your Subscription:
https://lists.apple.com/mailman/options/coreaudio-api/archive%40mail-archive.com
This email sent to [email protected]
