Re: pcm_multi poll timeout error

[Lee Revell <rlrevell@joe-job.com>]

On Mon, 2005-12-12 at 12:31 +0100, Takashi Iwai wrote:
> At Fri, 9 Dec 2005 20:15:02 +0000,
> John Rigg wrote:
> > 
> > On Fri, Dec 09, 2005 at 12:55:27PM -0500, Jeremy Hall wrote:
> > > In the new year, John Rigg wrote:
> > > > On Fri, Dec 09, 2005 at 12:40:05PM +0100, Takashi Iwai wrote:
> > > > > The link_fd returns the file descriptor for linking multiple PCM
> > > > > streams.  If you comment it out, it means that no link is possible.
> > > > > It means that snd_pcm_link() didn't do anything in fact after your
> > > > > patch.
> > > > 
> > > > I can't understand why this works after my patch broke snd_pcm_link .
> > >
> > > It probably works because the rme cards are synced by an external means 
> > > such as word clock or the entity they are connected to has master sync
> > 
> > Makes sense. So, the situation appears to be:
> > 1 - The link code is unnecessary for duplex operation of multiple
> > clock-synchronised sound cards with jackd.
> > 2 - It breaks the above when present.
> 
> Hm, the question is what the cable-sync really does.  Basically the
> linked PCM streams in ALSA are just for trigger actions,
> i.e. start/stop streams.  The others are not really related.
> 
> However, the recent changes of multi pcm tries to use only one pollfd
> as a master, and this seems broken in your case.  Or, it's really the
> matter of linked streams.
> 
> Will come back to this issue later...
> 

Takashi-san,

I'm not sure I fully understand - are you saying JACK is broken or that
it's an ALSA bug?

Lee


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