[ALSA - driver 0000758]: Full duplex is not working in OSS emulation.

[bugtrack@alsa-project.org]

A NOTE has been added to this issue.
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<https://bugtrack.alsa-project.org/alsa-bug/view.php?id=758> 
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Reported By:                croiset
Assigned To:                
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Project:                    ALSA - driver
Issue ID:                   758
Category:                   PCI - RME 96
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     new
Distribution:               Redhat 7.2
Kernel Version:             2.4.7
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Date Submitted:             12-29-2004 10:15 CET
Last Modified:              05-10-2006 14:56 CEST
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Summary:                    Full duplex is not working in OSS emulation.
Description: 
If I play something with one player, I am unable to record something on the
same device.
The same thing ispossible with the other cards I have.
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Relationships       ID      Summary
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related to          0000521 Jack + Alsa not working in full duplex,...
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----------------------------------------------------------------------
 croiset - 05-09-06 15:49 
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We put some logs in rme96.c for debugging the problem.

We obtain this :

The function snd_rme96_capture_hw_params returns -EBUSY when we open the
analog capture device when the analog output device is already opened in
play mode because :

rme96->playback_periodsize = 2048
rme96->capture_frlog = 2
params_period_size(params)=2048

then the tsst in line 1052 (alsa 1.0.11) is valid and then returns -EBUSY

If the analog output device is not opened, when we capture, the values are
:
rme96->playback_periodsize = 0
rme96->capture_frlog = 2
params_period_size(params)=2048

then the test is not valid and the device is working.

----------------------------------------------------------------------
 tiwai - 05-10-06 14:56 
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That makes sense.  RME96 requests exactly the same condition for playback
and capture sides.
When you use OSS, each ioctl tries to change one parameter, and at some
stage, it results in an incompatible state.  Usually this should be
restricted via hw_constraint settings, but rme96.c has no proper code for
that.

Issue History
Date Modified  Username       Field                    Change              
======================================================================
12-29-04 10:15 croiset        New Issue                                    
12-29-04 10:15 croiset        Distribution              => Redhat 7.2      
12-29-04 10:15 croiset        Kernel Version            => 2.4.7           
12-29-04 14:17 tiwai          Note Added: 0002998                          
12-29-04 14:54 croiset        Note Added: 0003000                          
12-29-04 17:39 tiwai          Note Added: 0003004                          
12-29-04 17:56 croiset        Note Added: 0003005                          
12-29-04 17:59 croiset        Note Added: 0003006                          
12-29-04 18:05 croiset        Note Edited: 0003006                         
12-29-04 18:18 croiset        Note Edited: 0003006                         
01-03-05 16:30 croiset        Note Added: 0003067                          
09-14-05 16:16 jdthood        Relationship added       related to 0000521  
12-30-05 23:08 rlrevell       Note Added: 0007278                          
01-02-06 09:12 croiset        Note Added: 0007368                          
05-09-06 14:09 croiset        Note Added: 0009657                          
05-09-06 15:49 croiset        Note Added: 0009659                          
05-10-06 14:56 tiwai          Note Added: 0009717                          
======================================================================




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