From: bugtrack@alsa-project.org
To: alsa-devel@alsa-project.org
Subject: [ALSA - driver 0001726]: Front and Rear channels swap after first play when playing Surround40 on au8830
Date: Fri, 28 Apr 2006 05:27:49 +0200 [thread overview]
Message-ID: <842e621a608ccb00f6f094656e0f96fd@bugtrack.alsa-project.org> (raw)
A NOTE has been added to this issue.
======================================================================
<https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1726>
======================================================================
Reported By: Raymond
Assigned To: mjander
======================================================================
Project: ALSA - driver
Issue ID: 1726
Category: PCI - au88x0
Reproducibility: always
Severity: major
Priority: normal
Status: assigned
Distribution: Fedora Core 1
Kernel Version: 2.4.22-1.2199.nptl
======================================================================
Date Submitted: 01-08-2006 17:41 CET
Last Modified: 04-28-2006 05:27 CEST
======================================================================
Summary: Front and Rear channels swap after first play when
playing Surround40 on au8830
Description:
The front and rear channels are correct for playing Surround40 only at the
first time after the driver is loaded.
The front and rear channels (Surround40) always swapped afterward using
speaker-test or xine.
Playing stereo sound is OK.
speaker-test -c4 -D hw:0,0
speaker-test 1.0.11rc2
Playback device is hw:0,0
Stream parameters are 48000Hz, S16_LE, 4 channels
Using 16 octaves of pink noise
Rate set to 48000Hz (requested 48000Hz)
Buffer size range from 2 to 8192
Period size range from 1 to 512
Periods = 4
Buffer time size 2525
To choose buffer_size = 8192
To choose period_size = 2048
was set period_size = 512
was set buffer_size = 8192
0 - Front Left
1 - Front Right
3 - Rear Right
2 - Rear Left
Time per period = 11.856821
0 - Front Left
1 - Front Right
3 - Rear Right
2 - Rear Left
======================================================================
----------------------------------------------------------------------
Raymond - 04-06-06 16:52
----------------------------------------------------------------------
Using the graphic equalizer and the following plugin which route 2 channels
to 4-channels.
pcm.test {
type plug
slave {
pcm "hw:0,0"
channels 4
}
ttable.0.0 0.5
ttable.0.1 1.0
ttable.1.2 0.75
ttable.1.3 0.25
}
The left peak is supposed to be always one half of the right peak.
aplay -D test stereo.wav
mplayer -ao alsa:device=test stereo.wav
left peak is 3 times of right peak indicates swap of front/rear channels
It's interesting that random swapping of channels can be reproduced by
speaker-test
speaker-test -D test -c 2 -t sine
----------------------------------------------------------------------
Raymond - 04-28-06 05:27
----------------------------------------------------------------------
> When run speaker-test several times in a row it swaps channels in that
order:
> Front Left become Front Right
> Front Right become Rear Left
> Rear Right become Front Left
> Rear Left become Rear Right
> For reproduce this I just run "speaker-test -t wav -c4 -D hw:0,0" for 3
to 17
> times in a row. On next run it restores channel order.
This seem to be an odd behaviour of speaker-test -t wav as described in
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=2026
Issue History
Date Modified Username Field Change
======================================================================
01-08-06 17:41 Raymond New Issue
01-08-06 17:41 Raymond Distribution => Fedora Core 1
01-08-06 17:41 Raymond Kernel Version => 2.4.22-1.2199.nptl
01-27-06 16:45 Raymond File Added: au88x0_surround40.patch
02-04-06 06:26 Raymond Note Added: 0007912
02-10-06 05:36 ponchick Note Added: 0007987
02-10-06 06:32 Raymond Note Added: 0007991
02-10-06 10:50 ponchick Note Added: 0007998
02-10-06 11:25 Raymond Note Added: 0008000
02-10-06 13:49 Raymond Note Added: 0008003
02-10-06 13:56 Raymond Note Edited: 0008003
02-12-06 07:48 Raymond Note Edited: 0008003
02-12-06 10:12 Raymond Note Edited: 0008000
02-16-06 05:37 ponchick Note Added: 0008085
02-16-06 08:12 Raymond Note Added: 0008088
02-16-06 10:12 Raymond Note Added: 0008090
02-16-06 10:28 Raymond Note Edited: 0008090
02-16-06 16:07 Raymond Note Added: 0008097
02-17-06 03:35 ponchick Note Added: 0008104
02-17-06 04:28 Raymond Note Added: 0008105
02-17-06 04:35 Raymond Note Edited: 0008105
02-17-06 05:56 Raymond Note Edited: 0008105
02-17-06 06:09 Raymond Note Edited: 0008105
02-26-06 07:22 ponchick Note Added: 0008198
02-26-06 13:28 Raymond Note Added: 0008200
02-26-06 14:08 Raymond Note Edited: 0008200
02-27-06 06:57 ponchick Note Added: 0008216
02-27-06 14:09 Raymond Note Added: 0008222
02-28-06 04:42 Raymond Note Added: 0008239
03-03-06 07:18 Raymond Note Added: 0008334
03-03-06 09:19 Raymond Note Edited: 0008334
03-24-06 14:57 Raymond File Added: AU8830.conf
03-24-06 15:04 Raymond Note Added: 0008918
03-31-06 10:22 Raymond Note Added: 0009043
04-03-06 14:24 Raymond Note Added: 0009096
04-06-06 16:52 Raymond Note Added: 0009125
04-28-06 05:27 Raymond Note Added: 0009538
======================================================================
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next reply other threads:[~2006-04-28 3:27 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-28 3:27 bugtrack [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-04-06 14:52 [ALSA - driver 0001726]: Front and Rear channels swap after first play when playing Surround40 on au8830 bugtrack
2006-04-03 12:24 bugtrack
2006-03-31 8:22 bugtrack
2006-03-24 14:05 bugtrack
2006-03-03 6:18 bugtrack
2006-02-28 3:42 bugtrack
2006-02-27 13:09 bugtrack
2006-02-27 5:57 bugtrack
2006-02-26 12:28 bugtrack
2006-02-26 6:22 bugtrack
2006-02-17 3:28 bugtrack
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2006-02-16 4:37 bugtrack
2006-02-10 12:49 bugtrack
2006-02-10 10:25 bugtrack
2006-02-10 9:50 bugtrack
2006-02-10 5:32 bugtrack
2006-02-10 4:36 bugtrack
2006-02-04 5:26 bugtrack
2006-01-08 16:41 bugtrack
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