Re: pcm_multi broken in alsa-lib - no duplex mode with jackd

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At Thu, 8 Mar 2007 21:51:28 +0000,
John Rigg wrote:
> 
> On Thu, Mar 08, 2007 at 07:58:23PM +0100, Takashi Iwai wrote:
> > At Thu, 08 Mar 2007 18:16:02 +0100,
> > Simon Lewis wrote:
> > > Many JACK users have successfully used the following patch:
> > > 
> > > http://www.sound-man.co.uk/linuxaudio/pcm_multi-patch
> > 
> > Well, the patch is no real fix.  It's likely a workaround for JACK,
> > though.  Someone has to take time to track down this bug more deeply.
> 
> True, the patch is just a workaround for JACK. However, I would
> argue that most users of pcm_multi are probably JACK users.

No, multi plugin is used in many surround PCM definitions as default.
It's pretty hidden, but multi streams are no rare case.

> Surely adding code that breaks something for the majority of users (no
> matter how correct that code is in isolation) is not a good thing.

Sure.  However, this code addition was for bugfixes of major other use
cases like above, IIRC.  The regression should be avoided and should
be fixed.  But the point is, we (at least, I) haven't been enough
informed, unfortunately (or simply burried in a big TODO list :)

Now, let's back to the original problem:  Could someone give a pointer
describing for this problem, or just explain a bit details here?
I vaguely remember but not precisely at all now...
I'm willing to dig down after knowing how I can reproduce the bug.


thanks,

Takashi

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