Re: aupreset values
Re: aupreset values
- Subject: Re: aupreset values
- From: Sven Thoennissen via Coreaudio-api <email@hidden>
- Date: Tue, 19 May 2020 15:42:54 +0200
Hi Brad,
A while ago I have wondered the same because it would be nice to control the
volume envelope with MIDI CCs.
I took the same approach like you did, and managed to write a small test
program that maps CC#72 to the VolEnvRelease parameter.
I used Logic Pro X and created a track with the AUSampler instrument (AU
Instruments -> Apple -> AUSampler). In the sampler I created a connection and
saved the preset, I guess this is what you did in AULab.
It still seems to work with iOS 13.
Though it seems kind of a hack to read, modify, and write back to the AU
fullState.
If you are interested I can send you the project. It’s a 4.9 MB zip file.
Best,
Sven
> Am 18.05.2020 um 10:31 schrieb Brad Howes via Coreaudio-api
> <email@hidden>:
>
> Hi,
>
> I’m wondering if there is any documentation for the values one finds in an
> ‘aupreset’ file? In particular the constants for ‘control’, ‘destination’,
> 'scale’, ‘source’, and ‘transform’ values in a ‘Connections’ array. I suspect
> these are all just internal values to the audio units being used. I am using
> the modern AVAudioSampler in an iOS app and I would like to offer controls
> for the shape of the envelope that is used by the instrument when it
> generates output. I know from experiments with AU Lab what destination values
> to use (I think):
>
> attack time - 570425244
> hold time - 571473920
> decay time - 572522496
> release time - 573571072
> sustain level - 574619649
>
> In AULab there are also some ‘* Factor’ destinations for the above times, but
> I am not clear how these affect the final envelope.
>
> As mentioned, my ultimate goal is to allow the user to adjust the filter
> shape with performance parameter changes, just like in AU Lab, by performing
> the following steps:
>
> Load a soundtont file
> Fetch the preset definition from AVAudioSampler via
> kAudioUnitProperty_ClassInfo property
> Modify preset with the proper parameter definitions and connections as
> gleaned from AU Lab presets
> Update the AUAudioSampler with the changed preset definition
>
> Does this seem reasonable? Thanks in advance for any doc / reference links
> you can provide.
>
> Regards,
>
> Brad
>
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| References: | |
| | >aupreset values (From: Brad Howes via Coreaudio-api <email@hidden>) |