[wdmaudiodev] RE： Re: Why would you want USB Audio 2.0 in Windows?
- From: Tsai Tzung-Dar <tdtsai1973@xxxxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Thu, 22 Oct 2009 22:48:06 -0700 (PDT)
Hi Frank:
Of course yes. And I can't find out any reason to say "No".
USB Audio Class 2.0 spec is final since 2006. Mac OSX can correctly support USB
Audio Class 2.0 device at Mac OSX 10.5.7. Why Microsoft don't support it.
Use USB Audio Class 20 spec it can let us full use USB High speed capability.
Its means we can provide over 192K 10ch 24bit in/out audio data at the same
time. We also can use it to provide Blue-Ray DVD audio content. Its even can
replace on board HDA Codec.
Our company have USB Audio Class 2.0 device and driver ready. We need WHQL
logo. But your DTM atest need to check UAA compliant. If you didn't provide USB
Audio Class 2.0 support. Its means we can't pass DTM test and get WHQL logo.
I think Many company have USB Audio Class 2.0 device and wait Microsoft support
USB Audio Class 2.0 UAA driver. So please enable USB Audio Class 2.0 support in
Windows.
BR,
Tzung-Dar Tsai
--- 09/10/23 (五)，Jerry Evans <jerry@xxxxxxxxxxx> 寫道：
> 寄件者: Jerry Evans <jerry@xxxxxxxxxxx>
> 主旨: [wdmaudiodev] Re: Why would you want USB Audio 2.0 in Windows?
> 收件者: wdmaudiodev@xxxxxxxxxxxxx
> 日期: 2009年10月23日,五,上午2:39
>
>
>
>
>
>
> In a nutshell:
> yes, yes and
> yes!. Having actually worked on firmware and drivers
> for a
> (never shipped) USB 2 audio device I know this would be a
> huge driver
> (groan) for USB 2 development.
>
>
>
> *Please* make sure the driver plays nice with exclusive
> mode WASAPI .
> Giving any Windows audio application a low latency,
> reliable, high
> bandwidth USB2 connection OOB would be splendid.
>
>
>
> Icing on the cake would be to have driver clients be able
> to sink
> signals to the USB2 microframe rate. This would make it
> *much* simpler
> to properly synch multiple USB audio sources. An advanced
> scenario
> perhaps but one that would reinforce the notion that
> Windows 7+ was the
> right platform for quality audio work.
>
>
>
> Thanks for asking.
>
>
>
> Jerry.
>
>
>
> David A. Hoatson wrote:
>
>
>
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>
> Frank,
>
> Thank you for
> asking! As
> Danijel mentioned USB Audio 2.0 support is
> important for
> higher sample rate / higher bit-depth / higher channel
> count hardware.
> If the hardware does 24-bit 192kHz then USB Audio 1.0
> cannot even do 2
> channels. Even with the more widely used 24-bit
> 96kHz, then channel
> count is limited to stereo. If someone wants to just
> use 24-bit 96kHz
> for 5.1 playback, this simply isn't possible with USB
> Audio 1.0.
>
> Now that there are
> more USB
> Audio 2.0 solutions coming to market, each company is
> having to develop
> it's own driver... and of course each will have varying
> degrees of
> success. Audio driver development is generally not
> the core competence
> for a chip-set company so they end up having a 3rd party
> company
> develop the driver. OEMs end up with the "not
> our fault" situation
> where the chip-set company blames the driver company and
> the driver
> company isn't being paid to fix bugs. The end
> result is products that
> don't work very well on Windows but work better on OS
> X.
>
> As it is now, all
> of the USB
> Audio 2.0 solutions are having to be qualified on OS X 10.6
> (which does
> support USB Audio 2.0).
>
> I think the key
> issue is
> market acceptance. Microsoft never supported audio on
> FireWire in the
> OS, and I would say there are fewer FireWire audio devices
> on the
> market as a result. If Microsoft supports USB Audio 2.0 in
> Windows 7
> SP1, I think you will see many USB Audio 2.0 devices hit
> the market.
>
> Thank
> you,
>
> David A.
> Hoatson
> Lynx Studio
> Technology,
> Inc.
> www.lynxstudio.com
>
>
>
>
>
> From:
> wdmaudiodev-bounce@xxxxxxxxxxxxx
> [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx]
> On Behalf Of Frank
> Yerrace
>
> Sent: Tuesday, October 20, 2009 6:24 PM
>
> To: wdmaudiodev@xxxxxxxxxxxxx
>
> Subject: [wdmaudiodev] Why would you want USB
> Audio 2.0 in
> Windows?
>
>
>
>
>
> There
> are occasional questions on this list about USB Audio 2.0
> support in
> Windows. We (the Windows sound team) are curious to hear
> specific
> reasons- scenarios, business, features, etc.- that would be
> enabled if
> USB Audio 2.0 support was included in Windows.
>
> Are any
> of you willing to share this? The more specific you can be,
> the better.
> If you do not want to share with the entire list then feel
> free to send
> a message to me directly.
>
> Frank
> Yerrace
> Microsoft
>
> This
> posting is provided "AS IS" with no warranties,
> and confers no rights.
>
>
>
>
>
>
>
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- » [wdmaudiodev] RE： Re: Why would you want USB Audio 2.0 in Windows? - Tsai Tzung-Dar
