Re: AppleUSBAudio reads GET_MAX volume, won't change range on status interrupt
Re: AppleUSBAudio reads GET_MAX volume, won't change range on status interrupt
- Subject: Re: AppleUSBAudio reads GET_MAX volume, won't change range on status interrupt
- From: Alison Hughes <email@hidden>
- Date: Mon, 31 Jan 2011 17:37:13 -0800
Dominik,
Please file a bug report.
Thanks!
Alison
On Jan 31, 2011, at 6:49 AM, Dominik Peklo wrote:
>
> Dear Alison,
>
> My USB Audio 1.0 device has a feature unit with volume control. I've set up status interrupt endpoint notifying host of device originated volume changes. Observing traffic with USB bus analyzer, I can see that upon raising interrupt pointing to the feature unit, Mac OS X issues all the GET_CUR, GET_MIN, GET_MAX & GET_RES requests. However, even if I report modified GET_MAX value, the volume control range does not change and remains at the value initially reported during enumeration. You might ask why would I need to change the range on-the-fly - the device has two user selectable means of volume control, both with a different maximum gain. Is there anything I can do on the device side to make this work or should I just file a bug report?
>
> Best Regards,
> Dominik
>
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