Re: status of usb audio driver

[Takashi Iwai <tiwai@suse.de>]

At Thu, 13 Jun 2002 22:35:44 +0900,
Patrick Shirkey wrote:
> 
> Takashi Iwai wrote:
> >>This card is supposed to be 24bit/96Khz. In windows it works like this:
> >>
> >>4 i/o channels(2 in, 2 out) at 16bit/48Khz or less
> >>3 i/o channels(2 in, 1 out or 1 in, 2 out) at 24bit/48Khz or less
> >>1 channel at 24bit/96Khz
> > 
> >  
> > interesting.  i don't find any mono channel on the descriptions.
> > well, more investigations are necessary.
> > 
> 
> It is confusing to me also. From reading their docs I thought that the 
> card was all seperate mono channels lsusb has changed my opinion. I now 
> belive that Quattro stands for 2 stereo i/o devices not 4 mono i/o devices.
> 
> By saying in the docs that it supports 1 channel at 24bit/96Khz I guess 
> they mean 1 stereo in or 1 stereo out. that is good news to me becasue I 
> was under the impression that I had bought a turkey with only one mono 
> i/o channel at 24/96.
 
i remember a guy from midiman told me that they support two channels
24/96 i/o.  well, we have to try whether he's right :)

> >>>i've tested usb mic from Labtec, and it works.
> >>>so the problem is specific to the hardware, or multi-channels...
> >>>
> >>
> >>I just remembered that my mouse is a usb mouse too so that is not 
> >>unexpected.
> > 
> > 
> > too much bandwidth?
> > 
> 
> Testing again with the new code didn't lock up my mouse and this time 
> the file actually recorded data although I still cannot capture noise. 
> Do you have any ideas on how I can adjust the input levels internally 
> seeing as the card has no apparent internal mixer?
 
how is the windows driver?  do they have such one?

> Is this a case of having to write our own mixer device?
> 
> Does this part of lsusb have anything to do with mixer controls?
> 
> ----
>   wChannelConfig     0x0003
>            Left Front (L)
>            Right Front (R)
>          iChannelNames           0
>          iTerminal               0
> ----

no, this defines only the configuration of speaker positions.
apparently on all streams, the input terminal is directly connected to
the output terminal.  there is no volume/switch control found at all
(at least on usb device descriptions).

about the capture, it might be a problem of usb audio driver.
right now i cannot test the capture again, because usb mic was already
returned to the owner.  possibly i can test tomorrow...


BTW, the new version is already on cvs.
i again modified (clean up) a bit since the version you have, so
please check whether it still works for you (i believe it must do,
though).


Takashi

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