[ALSA - lib 0002095]: Choppy sound using default dmix config for some applications but not others.

[bugtrack@alsa-project.org]

A NOTE has been added to this issue.
======================================================================
<https://bugtrack.alsa-project.org/alsa-bug/view.php?id=2095> 
======================================================================
Reported By:                BigBaaadBob
Assigned To:                perex
======================================================================
Project:                    ALSA - lib
Issue ID:                   2095
Category:                   1_pcm_d - direct PCM plugins (dmix+)
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     assigned
======================================================================
Date Submitted:             05-03-2006 01:09 CEST
Last Modified:              05-09-2006 18:19 CEST
======================================================================
Summary:                    Choppy sound using default dmix config for some
applications but not others.
Description: 
As reported in http://forums.gentoo.org/viewtopic-t-457951.html
alsa 1.0.11 causes skipping sound in some applications but not others.

Sound skips in rhytymbox and totem, but not xmms, realplayer, or mplayer.

This occurs with default dmix setup (i.e. with no .asoundrc).  Creating an
.asoundrc like this causes the skipping to stop for those applications
that skip.

pcm.!default {
  type hw
  card 0
}

This has been reported using the cmipci driver, the Intel ICH4 driver, the
i915GM driver, and on a ppc iBook G4.

On user reports that fiddling with the .asoundrc parameters can lessen the
problem, but not eliminate the problem.
======================================================================

----------------------------------------------------------------------
 dsandras - 05-09-06 13:20 
----------------------------------------------------------------------
Many Ekiga users are also complaining about this problem. Reverting to an
older libasound2 makes it disappear.

It also crashes the Ekiga ALSA plugin:
#3  0xb6376fe5 in free () from /lib/tls/libc.so.6
#4  0xb58b6f70 in snd_pcm_adpcm_decode () from /usr/lib/libasound.so.2
#5  0xb58955b9 in snd_pcm_hw_free () from /usr/lib/libasound.so.2
#6  0xb58bc3ed in _snd_pcm_rate_linear_open () from
/usr/lib/libasound.so.2
#7  0xb58955b9 in snd_pcm_hw_free () from /usr/lib/libasound.so.2
#8  0xb589fc2e in snd_pcm_close () from /usr/lib/libasound.so.2


I think that the person who will fix that problem should check everything
works OK with Ekiga and contact me personally in case of problem.

(The backtrace above is obtained after a export MALLOC_CHECK_=2 to force
crashes in case of memory allocation problems).

----------------------------------------------------------------------
 snark - 05-09-06 18:19 
----------------------------------------------------------------------
I must precise that we were about to release ekiga 2.0.2 when our users
began to report sloppy sound issues... and decided to postpone it, since
it wasn't acceptable to release a new stable point which breaks so easily.
:-(

The fact that we have several users showing the issue also means that we
can probably find beta testers for a real fix :-)

I'll try to have them try the defaults.pcm.dmix_max_periods -1 workaround.

Issue History
Date Modified  Username       Field                    Change              
======================================================================
05-03-06 01:09 BigBaaadBob    New Issue                                    
05-03-06 01:27 wellwhoopdedoooNote Added: 0009580                          
05-03-06 01:28 wellwhoopdedoooIssue Monitored: wellwhoopdedooo                  
 
05-03-06 01:29 wellwhoopdedoooNote Edited: 0009580                         
05-03-06 01:31 BigBaaadBob    Note Added: 0009581                          
05-03-06 11:45 tiwai          Note Added: 0009586                          
05-03-06 19:27 tiwai          Note Added: 0009601                          
05-05-06 22:49 BigBaaadBob    Note Added: 0009632                          
05-09-06 06:48 razamatan      Note Added: 0009651                          
05-09-06 06:49 razamatan      Issue Monitored: razamatan                    
05-09-06 06:55 razamatan      Note Edited: 0009651                         
05-09-06 07:23 razamatan      Note Edited: 0009651                         
05-09-06 13:20 dsandras       Note Added: 0009654                          
05-09-06 18:19 snark          Note Added: 0009671                          
======================================================================




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