[xine-bugs] [ xine-Bugs-1650019 ] 5.1 surround sound channels wrong on AC'97 sound chip (ICH4)

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Bugs item #1650019, was opened at 2007-02-01 18:23
Message generated for change (Comment added) made by f-3582
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Category: audio output problems
Group: v1.1.4
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: F-3582 (f-3582)
Assigned to: Nobody/Anonymous (nobody)
Summary: 5.1 surround sound channels wrong on AC'97 sound chip (ICH4)

Initial Comment:
Hi,

I'm using a laptop with an Intel ICH4 AC'97 sound chip. Crappy thing, indeed. My problem is the following:

When testing the output with the built-in ALSA speaker test, the audio channels are addressed correctly:

0 - Front Left
1 - Front Right
2 - Rear Left
3 - Rear Right
4 - Center
5 - LFE

However, when playing 5.1 encoded audio or video, the channels 2/3 are addressed as 4/5 and vice versa. I can fix this by switching the jacks, but overall, it is pretty annoying. The test file I used was found here (called 6_channel_id.wav):

www.geocities.com/russell_garber/plug.html

The file worked correctly on a friend's Windows PC.

Does anyone know what causes this problem?

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>Comment By: F-3582 (f-3582)
Date: 2007-03-08 16:36

Message:
Logged In: YES 
user_id=1516719
Originator: YES

I just noticed one thing: AC3 surround sound goes to the right channels.
This problem only happens with wav files encoded to 5.1

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=109655&aid=1650019&group_id=9655