multi_pcm poll timeout error

multi_pcm poll timeout error

[John Rigg]

The pcm_multi plugin doesn't work currently with jackd in duplex mode. 
It's OK for either capture or playback with multi cards, but a poll time out
occurs in duplex mode. Several users have experienced this problem with
multiple ice1712 and RME cards.
After some testing I found the following:

alsa-lib-1.0.8 works
alsa-lib-1.0.9rc1 onwards gives poll time out

These were both tested with a recent version of jackd (0.100.7 with
MMAP_COMPLEX patch) on Debian 3.1.
Don't know if it's relevant, but this appears to be about the time 
pcm_generic.h was added.

John


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Re: multi_pcm poll timeout error

[John Rigg]

On Sat, Dec 03, 2005 at 03:23:18PM +0000, John Rigg wrote:
> The pcm_multi plugin doesn't work currently with jackd in duplex mode. 
> It's OK for either capture or playback with multi cards, but a poll time out
> occurs in duplex mode. Several users have experienced this problem with
> multiple ice1712 and RME cards.
> After some testing I found the following:
> 
> alsa-lib-1.0.8 works
> alsa-lib-1.0.9rc1 onwards gives poll time out

The following patch comments out the offending code in
alsa-lib-1.0.10/src/pcm/pcm_multi.c and allows jackd to run in duplex
mode with multiple cards.
Obviously this isn't a proper fix (the code must have been added for
a reason) but it's working so far on my system.

John

--- src/pcm/pcm_multi.c.orig	2005-12-03 20:10:58.000000000 +0000
+++ src/pcm/pcm_multi.c	2005-12-03 20:20:56.000000000 +0000
@@ -597,7 +597,7 @@ static int snd_pcm_multi_resume(snd_pcm_
 	return err;
 }
 
-static int snd_pcm_multi_link_fd_failed(snd_pcm_t *pcm, int fd)
+/* static int snd_pcm_multi_link_fd_failed(snd_pcm_t *pcm, int fd)
 {
 	snd_pcm_multi_t *multi = pcm->private_data;
 	unsigned int i;
@@ -638,7 +638,7 @@ static int snd_pcm_multi_unlink(snd_pcm_
 		multi->slaves[i].linked = 0;
 	}
 	return 0;
-}
+} */
 
 static snd_pcm_sframes_t snd_pcm_multi_mmap_commit(snd_pcm_t *pcm,
 						   snd_pcm_uframes_t offset,
@@ -726,9 +726,9 @@ static snd_pcm_fast_ops_t snd_pcm_multi_
 	.rewind = snd_pcm_multi_rewind,
 	.forward = snd_pcm_multi_forward,
 	.resume = snd_pcm_multi_resume,
-	.link_fd = snd_pcm_multi_link_fd,
+//	.link_fd = snd_pcm_multi_link_fd,
 	.link = snd_pcm_generic_link2,
-	.unlink = snd_pcm_multi_unlink,
+//	.unlink = snd_pcm_multi_unlink,
 	.avail_update = snd_pcm_multi_avail_update,
 	.mmap_commit = snd_pcm_multi_mmap_commit,
 	.poll_descriptors_count = snd_pcm_multi_poll_descriptors_count,


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