[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 15:48 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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----------------------------------------------------------------------
 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.

----------------------------------------------------------------------
 croiset - 05-10-06 15:48 
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How can we do this ?

There is already some code in lines 1146 for that limitation. If you use
playback mode the first time, you have RME96_SMALL_BLOCK_SIZE used, if you
use record the first time you use the value RME96_LARGE_BLOCK_SIZE. when
you want full duplex, the driver wants to use RME96_SMALL_BLOCK_SIZE and
RME96_LARGE_BLOCK_SIZE so you have the -EBUSY return.

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                          
05-10-06 15:48 croiset        Note Added: 0009718                          
======================================================================




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