Re: Default ChannelLayout's
Re: Default ChannelLayout's
- Subject: Re: Default ChannelLayout's
- From: "B.J. Buchalter" <email@hidden>
- Date: Fri, 03 Jun 2005 09:57:54 -0400
on 6/3/05 2:44 AM, Derk-Jan Hartman at email@hidden wrote:
> Now it seems that as far as i can tell ALL setups do not know this
> themselves. You need to explicitly set this in Audio Midi Setup Util.
> Even worse it seems that even if it shows correctly in Audio Midi Setup
> util, you need to explicitly CHANGE, apply, change BACK and again apply
> to get this set.
This definitely appears to be a bit buggy. You should file a bug about the
AMS UI not taking the changes without switching back and forth (I kinda
noticed this as well).
IMHO, if there is no ChannelLayout defined when you query it, you should
assume that the device should be treated as stereo, with the L and R
channels on output channels 1 and 2. This is what QT did up until QT7 and we
never had any support questions about it (if people wanted to listen in
surround, they went and set the Channel Layout).
At QT7, the behavior seems to have changed, and QT7 seems to make some
assumptions about the channel layout based upon the number of available
channels, if the AMS channel layout has not been set. This has caused a
number of customers to call for support, because QT was playing mono signals
out Channel 3 (the assumed center channel).
Users expect the multichannel devices to work as stand-ins for stero devices
unless they explicitly configure things for multichannel/surround operation.
Perhaps if you detect a multichannel device with no channel layout, you can
put up a message telling the user that if they want surround output they
should go and set up the speaker layout in AMS.
Best regards,
B.J. Buchalter
Metric Halo
5 Donovan Drive
Hopewell Junction, NY 12533 USA
tel +1 845 223-6112
fax +1 603 250-2451
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