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

bugtrack
2006-05-10T13:48:03Z

Last Modified: 05-10-2006 15:48 CEST
======================================================================
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.
======================================================================
Relationships ID Summary
----------------------------------------------------------------------
related to 0000521 Jack + Alsa not working in full duplex,...
======================================================================

----------------------------------------------------------------------
tiwai - 05-10-06 14:56
----------------------------------------------------------------------
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
----------------------------------------------------------------------
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
======================================================================

-------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo