[wdmaudiodev] Re: Question about APO and multichannel inputs
- From: Larry Osterman <Larry.Osterman@xxxxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Tue, 11 Aug 2009 04:46:21 +0000
Note that your IsInputFormatSupported call won't always be made in audiodg.exe,
sometimes it will be made in the audio service itself.
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
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Arunasree_Swapna@xxxxxxxxxxxx
Sent: Monday, August 03, 2009 9:54 AM
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Subject: [wdmaudiodev] Re: Question about APO and multichannel inputs
I am faced with a similar problem with an LFX APO we have.
Why is the behavior different for different players and how do we use the API
IsInputFormatSupported() and IsOutputFormatSupported() correctly, so we can do
the right thing?
Any code snippets?
~Aruna
Arunasree Swapna
Software Engineer
Logitech
360-514-5760 (office)
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"Cheng-mean Liu (SOCCER)" <soccerl@xxxxxxxxxxxxx>
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[wdmaudiodev] Re: Question about APO and multichannel inputs
When running with different players, are you seeing different behavior (call
parameters, return code) in your APO's handling of IsInputFormatSupported()?
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of MikeLee@xxxxxxxxxxxxxx
Sent: Monday, August 03, 2009 5:46 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Question about APO and multichannel inputs
Hi All,
I am developing a LFX APO to implement a stereo headphone with surround effect.
The APO includes a multi-channel to stereo virtualizer. The APO can accept both
stereo input and multi-channel input and output stereo virtualized sound. Now,
we are testing our APO. If the test player is Windows Media player, the APO
works fine. We can try a 2-channel songs and then a 6-channel music. The APO
input channel number is changing with the file content which is playing by WMP.
But, it is not the case of other players. When we use WinAmp as player and play
a stereo music file and then drag a 6 channel file to play. The result is we
can not see any format change action in APO side. And the input format remain
unchanged 2 channel. The 6 channel file is down mixed to 2-channel to be
received by APO. Since APO did not get the exact multi-channel data, the
virtualized result is not what we desired.
I tried another player; it has the same behaviors as WinAmp.
Does any one know why it happens?
Why WMP can void this problem?
I am trying to fix the input format to 6-channel( by change
IsInputFormatSupported() and IsOutputFormatSupported() ), but failed. Is it
possible?
Thanks in advance.
Mike
Software Dept.
VIA Technologies (China) Inc., Ltd.
E-mail: MikeLee@xxxxxxxxxxxxxx
Tele: 86-010-59852288 ext.3830
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