[ALSA - lib 0000929]: Left/Right reversed when using the raw iec958 on Audigy2

[bugtrack@alsa-project.org]

A NOTE has been added to this issue.
======================================================================
<https://bugtrack.alsa-project.org/alsa-bug/view.php?id=929> 
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Reported By:                TheOrwithVagrant
Assigned To:                
======================================================================
Project:                    ALSA - lib
Issue ID:                   929
Category:                   hw specific configuration
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     new
======================================================================
Date Submitted:             02-21-2005 14:56 CET
Last Modified:              03-19-2005 11:46 CET
======================================================================
Summary:                    Left/Right reversed when using the raw iec958 on
Audigy2
Description: 
When using an spdif-attatched amplifier, the iec958/spdif raw device to
play a sound (or video file), the left and right channels end up
reversed.

Example:

This produces "correct" left and right mappings

extract_ac3 AC3TEST.VOB |ac3dec

The following, however, reverses left & right:

extract_ac3 AC3TEST.VOB |ac3dec -R

Likewise, when playing a dvd with mplayer, things are correct if i merely
use -ao alsa, but end up with left/right reversed if i use -ao
alsa:device=iec958.

It appears to be an error in Audigy2.conf - changing the line

value [ 255 255 0 0 0 0 0 0  0 255 0 0 0 0 0 0 255 0 0 0 0 0 0 0 ]

to

value [ 255 255 0 0 0 0 0 0  255 0 0 0 0 0 0 0 0 255 0 0 0 0 0 0 ]

as in Audigy.conf, makes the channels appear from the right speaker even
when using the raw spdif device.
======================================================================

----------------------------------------------------------------------
 TheOrwithVagrant - 03-19-05 11:36 
----------------------------------------------------------------------
As stated earlier in the comments, this channel reversal was a "fix" to
make AC3 passthrough work on Audigy2. However, apart from having the side
effect that made me file this bug, that fix also didn't work for
everyone.
However, James Courtier-Dutton is working on a proper fix in the DSP code
of the actual driver which makes this Audigy2.conf "error" unneccessary.
As soon as James's fix is committed in CVS, I think this bug can be
closed.

----------------------------------------------------------------------
 jcdutton - 03-19-05 11:46 
----------------------------------------------------------------------
A proper fix for this is using DSP code. I recently posted an email to
alsa-user with a patch for people to try, who are having problems with AC3
out on the raw iec58 device. So, depending on their feedback, it will be
fixed soon.

Issue History
Date Modified  Username       Field                    Change              
======================================================================
02-21-05 14:56 TheOrwithVagrantNew Issue                                    
02-21-05 15:04 pzad           Note Added: 0003679                          
02-21-05 15:14 TheOrwithVagrantNote Added: 0003680                          
02-22-05 03:59 rlrevell       Note Added: 0003684                          
03-19-05 09:21 jdthood        Note Added: 0004013                          
03-19-05 09:58 jdthood        Note Added: 0004028                          
03-19-05 11:36 TheOrwithVagrantNote Added: 0004032                          
03-19-05 11:46 jcdutton       Note Added: 0004033                          
======================================================================




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