[wdmaudiodev] Re: Windows 7 :: usbaudio.sys
- From: Tsai Tzung-Dar <tdtsai1973@xxxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Wed, 2 Nov 2011 07:19:19 -0700 (PDT)
Hi -t.
Would you be willing to email me (off list) the USB descriptors you're using?
As I know in Windows XP can playback the 24-bit data in both 3-byte and 4-byte
containers. But in Recording part only use 24bit data in 3bytes containers. And
if your device support multi-channels playback, the USBAudio.sys will choose
multi-channels alternate-setting to play frist.
BR,
Tzung-Dar Tsai
________________________________
寄件者： -t <tge96@xxxxxxxxx>
收件者： "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
寄件日期： 2011/11/2 (三) 12:55 AM
主旨： [wdmaudiodev] Re: Windows 7 :: usbaudio.sys
Hi Dan,
Yes, no problem :)
From: Daniel E. Germann <deg@xxxxxxxx>
>To: wdmaudiodev@xxxxxxxxxxxxx
>Sent: Saturday, October 29, 2011 5:36 AM
>Subject: [wdmaudiodev] Re: Windows 7 :: usbaudio.sys
>
>Hi, t.
>
>I have been able to successfully play and record under Windows 7 with our USB
>device, which packs 24-bit samples into 3-byte containers. There are
>artifacts due to a bug in waveIn/waveOut sample rate conversion, but if the
>application sample rate
matches the sample rate set in the control panel, it works fine.
>
>http://social.msdn.microsoft.com/Forums/en-US/windowspro-audiodevelopment/thread/725546ce-57bf-40d0-b7aa-47e51de9c3ae/
>
>Unfortunately, the same device can play successfully on Windows XP, but the
>application gets erroneous data when recording if the device is opened in
>24-bit mode. I tried packing the 24-bit data in both 3-byte and 4-byte
>containers, and the results were the same. The returned sample data is always
>000000 or FFFFFF. If the application opens the device in 16-bit mode, valid
>sample data is returned in the record buffer. This is particularly confusing,
>since the device always sends 24-bit data.
>
>Are you saying your device is able to play and record in 24-bit mode under
>Windows XP? If so, would you be willing to email me (off list) the USB
>descriptors you're using? We've been trying to figure out a solution for this
because many of our client's customers still use Windows XP.
>
>Thank you,
>-Dan
>
>
>>
>> Date: Fri, 28 Oct 2011 13:10:46 -0700 (PDT)
>> From: -t <tge96@xxxxxxxxx>
>> Subject: [wdmaudiodev] Windows 7 :: usbaudio.sys
>>
>> Hi,
>>
>> I'm wondering if you might know if usbaudio.sys in Windows 7 supports
>> playback of 4-byte subframes with 24-bit resolution?
>>
>> I have this topology working on my Windows XP 32-bit machine, and MacOS.
>> However, for some reason Windows 7 is giving me mixed results. My record
>> stream shows up in Sound, but my playback stream does not. The only thing
>> I'm doing that's a bit not standard is 4B subframe. I'm planning to try
>> with 3B subframe in the next couple of days or so, just to see if that works.
>>
>> First, I'd like to confirm whether or not usbaudio.sys in
Windows 7 support this topology or not?
>>
>> Many thanks,
>> -t
>
>
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