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    SubjectRe: USB-audio strange problems
    > At Wed, 19 Mar 2008 22:12:47 +0100,
    > Pavel Machek wrote:
    > >
    > > Hi!
    > >
    > > Ok, so it took me a year to get back to this bug. Oops.
    >
    > Oh well, I don't remember what was the exactly problem...

    Yes, sorry about that.

    > > > Yep, let's fix it. Just to make sure (ane debugging easy atm), could
    > > > you attach the following?
    > > >
    > > > - content of /proc/asound/cards
    > > > - content of /proc/asound/card*/stream*
    > > > - the output of "lsusb -v"
    > > > - the generated file via "alsactl -f store somefile"
    > > >
    > > > If I remember correctly, alsamixer at least doesn't break if you build
    > > > snd-usb-audio driver with IGNORE_CTL_ERR enabled, right?
    > >
    > > I got the usb soundcard to work. I still have IGNORE_CTL_ERR enabled.
    > >
    > > Problem was not mixer after all... somehow it expects me to play sound
    > > as 8-bit, and then I can play 16-bit mono and actually hear
    > > it. _Strange_.
    > >
    > > So:
    > >
    > > mplayer -ao alsa:device=hw=0 -af format=u8 KDE_Startup.wav
    > > mplayer -ao alsa:device=hw=0 -af format=s16le -af resample=48000 -af channels=1 KDE_Logout_1.ogg
    > >
    > > ...plays both files.
    > >
    > > Forget about the first mplayer, and it will play nothing.
    >
    > Dalls DS4201 has a known bug that it doesn't handle U8 format but only
    > S8 format. The driver changes the supported format flags from U8 to
    > S8 when this USB ID is detected. So you cannot play U8 format
    > natively. (Still strange that it is accepted by mplayer.)

    But problem is: I have to. Otherwise the second mplayer will produce
    just silence.

    Also, even with that treatment, I'm unable to play stereo :-(.

    How to debug this?
    Pavel
    --
    (english) http://www.livejournal.com/~pavelmachek
    (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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