Re: USB Audio/Midiman - partial success

[Takashi Iwai <tiwai@suse.de>]

At Mon, 23 Sep 2002 21:14:36 -0700 (PDT),
Fedor G. Pikus <fedorp@wv.mentorg.com> wrote:
> 
> On Mon, 23 Sep 2002, Clemens Ladisch wrote:
> > Fedor G. Pikus wrote:
> > > On Fri, 20 Sep 2002, Clemens Ladisch wrote:
> > >
> > > >       case EXPIRED:
> > > >               snd_printd("capture read error (DMA or IRQ trouble?)\n");
> > > >               err = -EIO;
> > > >
> > > > Are you _really_ sure you have recompiled the entire alsa-driver package
> > > > with debug output, installed it correctly, and there's nothing in the log?
> > >
> > > kernel: ALSA ../alsa-kernel/core/pcm_lib.c:2212: EXPIRED in snd_pcm_lib_read1 ...
> >
> > The "capture read error" message should have been printed.
> > I guess debug output isn't really enabled for your ALSA core.
> I also thought so when I found that snd_printd. I use cvscompile which
> does add --with-debug-full to configure (and I tried running configure manually
> with this switch), --with-debug=full must not be working (I noticed earlier
> "full" does not generate the messages which are generated by "detect", so
> I'm not sure what "full" actually does).

well, snd_printdd() is activated only when --with-debug=detect is
used.  but snd_printd() is activated even with --with-debug=full.

yeah, this debug option looks confusing.  everybody would think that
full is full, but not fulfilled in reality :)

> > > when everything works ok it gets interrupted but when I'm trying to record
> > > at 96000 it does not. Where do I look now?
> >
> > In theory, snd_complete_urb is called when some data has been received
> > from the device, and this function calls retire_capture_urb. Please check
> > whether those functions are really called.
> They do get called, it goes like this:
> pcm_lib.c:2168 unlocked IRQ, waiting for 10 seconds
> snd_complete_urb called
> retire_capture_urb called
> retire_capture_urb done
> snd_complete_urb exits (by exiting through the bottom, never through return)
> ... repeat about 740 times the above 4 lines ...
> pcm_lib.c:2170 timed out after 10 seconds

does it means that complete is called _after_ the 10-sec-wait message?
could you tell me the function (line) corresponding to the original
source (the line is shifted so i cannot see where it is).


Takashi


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