[ALSA - driver 0000955]: CN-126 - USB 5.1 Audio adapter

[Fruhwirth Clemens <clemens@endorphin.org>]

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My USB audio class device doesn't show all mixer controls in ALSA.
For reference, for other users searching this archive, it's a "Creative
USB Sound Blaster Live! 24-bit External". 
(http://creative.com/products/product.asp?category=1&subcategory=206&product=10702&nav=2)

I have added some inspection code to usb-mixer.c, which basically dumps
all class specific USB interface descriptors. 

My card got 2 x OUTPUT_TERMINAL, 2 x INPUT_TERMINAL, 2 x FEATURE_UNIT
for the AudioControl class. But this doesn't make me any wiser.

I wonder why the snd_usb_create_mixer code does only loop over the
OUTPUT_TERMINAL class, even there is support code for all other types in
the parse_audio_unit code, which is called subsequently by
snd_usb_create_mixer.

My aim is to have controls available for the Line-in mixer, both for
recording and for direct re-mixing into the Main Out Plug.

Is there a developer owning such a box, or anyone who can guess what I'm
supposed to do with the additional AudioControl class controls? 

Are there any tools that helps inspecting the USB device, or further
dumping of class-specific content and/or inspection of the USB
flow between a vmware hosted windows system and the linux host system?

Thanks,

What's the reason why Bug#995 is not available to the public? I'm
getting access denied. Otherwise I would have put this message into the
bugtracker.
-- 
http://clemens.endorphin.org, for robots sp4mtrap@endorphin.org

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