Re(2): CoreMIDI (drivers)
Re(2): CoreMIDI (drivers)
- Subject: Re(2): CoreMIDI (drivers)
- From: "Sean Morrell" <email@hidden>
- Date: Mon, 08 Oct 2001 14:57:37 -0700
email@hidden writes:
>
On Monday, October 8, 2001, at 10:54 PM, pete wrote:
>
>
> I am developing a final year University project in Cocoa. The
>
> project uses MIDI, and I have an emagic usb MIDI adapter. I have
>
> emailed emagic to ask for a beta of their driver, but they informed me
>
> that the driver will be released by Apple. If there are any Apple bods
>
> on the list, could they answer the following questions:
>
>
>
>
Apple is releasing MIDI drivers for device which are USB MIDI compliant,
>
and for serial MIDI . These are locate inside the
>
/System/Library/Extensions folder in 10.1 (and already 10.0) . So if
>
this device is USB MIDI compliant it should be OK.
The AppleUSBAudio driver does indeed add the allowable formats and sample
rates of any given channel. And this works fine if the device supports
all the channels run at each channel's highest bit depth and sample rate.
With our device however, we can't just add all possible formats and sample
rates of each channel. The device will certainly support the highest bit
depth and sample rate on any channel, but only one channel. For multiple
channels to be used, either the bit depth or sample rate must be lowered,
across ALL channels. I don't see the AppleUSBAudio driver coded to handle
this situation, where the available format and sample rate for any channel
is dependent on the current format and sample rate of other enabled
channels.
Does CoreAudio provide applications the ability to load a custom device
configuration dialog implemented by the driver?
>
>
>
Otherwise Apple has released sample code that third party company could
>
take inspiration of.
>
>
Laurent
>
>
Laurent Cerveau
>
Applications Engineering
>
Apple Computer Inc.
>
email@hidden
>
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