Re: iOS CoreAudio MIDISynth music device configuration
Re: iOS CoreAudio MIDISynth music device configuration
- Subject: Re: iOS CoreAudio MIDISynth music device configuration
- From: "email@hidden" <email@hidden>
- Date: Wed, 04 Jul 2018 19:01:52 -0700
Are you using the C API or the Objective C API?
Why do you have multiple 16-channel MIDISynth units running? You could
possibly run out of CPU because they cannot steal voices from each other.
If your MIDISynth code works for one bank but not another, I find it hard to
imagine it is a configuration issue.
Can you point me to the banks in question?
-DS
> On Jul 3, 2018, at 3:02 PM, Bartosz Nowotny <email@hidden> wrote:
>
> Hello
>
> I need advice on how to properly configure AudioUnits in my MIDISynth iOS app.
>
> In my code I start by configuring AudioSession: I set the right category
> (playback), preferred sample rate and buffer size and then start the session.
> Next up, I create the graph: multiple synth units
> (kAudioUnitSubType_MIDISynth) -> multichannel mixer -> remote IO.
> For mixer unit, I configure number of input elements (buses) and maximum
> frames per slice.
> For synth units, I configure the soundbank URL and maximum frames per slice.
>
> This set up is enough for my app to successfully produce music by sending
> MIDI note on/off events to specific synth units. For some soundfonts, the
> produced sound is not correct, as if it was distorted. Because the soundfonts
> I'm using are popular and publicly available soundfonts, tested on multiple
> devices and different synths, I'm pretty certain the soundfonts are not at
> fault here. My best guess is that I'm missing parts of the configuration:
>
> 1. Is any additional configuration required for any of the AudioUnits I use?
> In particular, should I configure synth units output stream format, so that
> for instance, the sample rate matches what is actually used by the hardware?
> Should I also configure stream format for the mixer or IO units? How should
> the stream format configs look like?
> 2. If I do need to do the above configuration, how should I respond to audio
> session route changes? I noticed, for instance, that plugging in headphones
> changes the hardware output sample rate from 48kHz to 44.1kHz.
>
> Regards,
> Bartosz
>
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