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Re: USB Class Driver
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Re: USB Class Driver


  • Subject: Re: USB Class Driver
  • From: Lubor Prikryl <email@hidden>
  • Date: Mon, 31 Jan 2005 22:32:34 +0100

Hi Jeff,
Thanks for very good explanation.

<x-tad-bigger>- Is the uncertainty in SR a property of the driver or of the device? Of every device? I tested YAMAHA speakers and M-Audio FastTrack, both of them allow any frequency in certain range.


</x-tad-bigger>
I don't understand the question. To what uncertainty are you referring?


Sorry, instead of uncertain I had to write continuous (opposite to discrete).

Actually you answered this question in the following sentences:


The second statement is true only if the first statement is true. It is entirely possible and legal for a device to publish a discrete range or supported sample rates. In such case, the device will publish a physical format for each individual sample rate.



But I cannot understand why the device publishes continuous range even if only a few discrete values are really supported.


The way to find out which two AudioDevices make up the input and output side of a given USB Audio device is via kAudioDevicePropertyRelatedDevices. This property returns an array of AudioDeviceIDs for all the devices that share the same IOAudioDevice.

That's it, thanks!!!

Regards

Lubor Prikryl
DSound (CZ)
Audio Software Developer
email@hidden
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References: 
 >AudioOutputUnitStart (From: john <email@hidden>)
 >USB Class Driver (From: Lubor Prikryl <email@hidden>)
 >Re: USB Class Driver (From: Jeff Moore <email@hidden>)

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