Re: pcm_multi poll timeout error

[John Rigg <ad@carbon-black.co.uk>]

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.

Hi Takashi

Thanks for the information. Now I'm puzzled. I assumed that pcm_multi
was working from the messages from jackd -v, but didn't actually try
recording and playing back simultaneously (haven't got that far setting
up my system). However, I just received the following info from another
user who tried my makeshift patch:

>> On Fri, Dec 09, 2005 at 02:10:49PM +0100, Achim_Kuntz wrote:
>> 
>>>I can confirm your results with my 2 x hdsp 9652 setup.
>>>With your patch applied jackd works in duplex mode using the multi device.
.... 
>> Can you actually record and play back simultaneously?
....
>Yes, I can record and play back simultaneously with the patch applied.
>I tested playback for all 2*24=48 channels of the multi device while 
>recording audio from the first channel of the first hdsp card, i.e. I 
>tested all playback channels but not all recording channels. Everything 
>seemed to work as intended.

I can't understand why this works after my patch broke snd_pcm_link .

John


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