With 8 tracks and the 2 MB soundfont, my AUGraph is taking about a
minute to initialize, and about 10 minutes for the 31 MB soundfont. This
would be doubled if 16 tracks were implemented.
If your assumption about the single preset being loaded for the
AVAudioUnitSampler is correct, I may experiment with moving my project
from the AUGraph and AudioUnit MIDISynth to an AVEngine and
AVAudioSampler configuration, especially if MIDI functionality past note
on/off messages is unsupported.
Would it be safe to assume that the AVEngine is just faster than the
soon-to-be-deprecated AUGraph?
Thanks,
Tim
Date: Wed, 21 Feb 2018 19:20:19 +0100
From: Sven Thoennissen<[email protected]>
To: CoreAudio API<[email protected]>
Subject: Re: Channel Specific MIDI Reverb with an AUGraph
Message-ID:<[email protected]>
Content-Type: text/plain; charset=utf-8
Hello,
I can confirm your findings; could not find a way to accomplish reverb with
MIDISynth. In my app I use AVAudioUnitSampler for each MIDI channel. This
solution works fine for me, especially since my app needs to connect 3rd party
AU extension effects. Even if MIDISynth supported reverb it would probably only
be Apple's reverb AU internally (not that it’s bad; my app just needs to
support AU extensions).
But to my positive surprise I found that loading SoundFont presets is rather
fast on the iPad Air 2, a small fraction of a second if I would have to guess.
I only have simple SoundFont layers (1 instrument per preset), no complex stuff
like multiple instrument layers, like some GM SoundFonts out there.
I also would assume that AUSampler only loads the sample data of the preset you
specify, instead of the entire SoundFont.
How long is “unacceptably long” for you?
Sven
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