Re(3): CoreMIDI (drivers)
Re(3): CoreMIDI (drivers)
- Subject: Re(3): CoreMIDI (drivers)
- From: "Sean Morrell" <email@hidden>
- Date: Mon, 08 Oct 2001 15:13:47 -0700
Sorry everyone,
My response, surrounded by '-----' below, was not intended for this
thread.
Sorry for the confusion,
Sean
email@hidden writes:
>
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
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>> project uses MIDI, and I have an emagic usb MIDI adapter. I have
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>> emailed emagic to ask for a beta of their driver, but they informed me
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>> that the driver will be released by Apple. If there are any Apple bods
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>> on the list, could they answer the following questions:
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>>
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>
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>Apple is releasing MIDI drivers for device which are USB MIDI compliant,
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>and for serial MIDI . These are locate inside the
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>/System/Library/Extensions folder in 10.1 (and already 10.0) . So if
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>this device is USB MIDI compliant it should be OK.
>
>
The AppleUSBAudio driver does indeed add the allowable formats and sample
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rates of any given channel. And this works fine if the device supports
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all the channels run at each channel's highest bit depth and sample rate.
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With our device however, we can't just add all possible formats and sample
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rates of each channel. The device will certainly support the highest bit
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depth and sample rate on any channel, but only one channel. For multiple
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channels to be used, either the bit depth or sample rate must be lowered,
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across ALL channels. I don't see the AppleUSBAudio driver coded to handle
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this situation, where the available format and sample rate for any channel
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is dependent on the current format and sample rate of other enabled
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channels.
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>
Does CoreAudio provide applications the ability to load a custom device
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configuration dialog implemented by the driver?
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>
>
>
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>Otherwise Apple has released sample code that third party company could
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>take inspiration of.
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>
>
>Laurent
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>
>
>Laurent Cerveau
>
>Applications Engineering
>
>Apple Computer Inc.
>
>email@hidden
>
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>
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