[wdmaudiodev] How to test for greater than 16-bit sample size
- From: "Perry, Chris" <Chris_Perry@xxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Wed, 22 Mar 2006 16:17:21 -0500
Okay, now that we're on the subject, how can I query the audio hardware
to
see if it supports BitsPerSample greater than 16-bits? IKsProperty or
IKsControl might be a way to do but GetCaps in Direct Sound, or the Wave
APIs or MMIO APIs will not report this nor will enumerating pin
properties
in DirectShow.
Chris Perry
Bose Corporation
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Marc Lindahl
Sent: Wednesday, March 22, 2006 4:06 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: My first WASAPI implementation.
That's exactly why, it was done before that format was around.
Also made it easy on apps to support multiple possible heterogeneous
sound cards, they simply opened all available stereo pairs regardless.
On Mar 22, 2006, at 3:52 PM, wdmaudiodev-bounce@xxxxxxxxxxxxx wrote:
> I never really did understand why vendors would publish a bunch of
> stereo pairs rather than one device that had many channels. Was this
to
> support
> legacy OS's that didn't have WAVEFORMATEXTENSIBLE?
>
> If I have one 8-channel stream I want to output, the last thing I want
> to
> do is open 4 virtual stereo devices and issues the play command to
each
> one.
>
> Chris Perry
> Bose Corporation
>
> -----Original Message-----
> From: wdmaudiodev-bounce@xxxxxxxxxxxxx
> [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Frank Yerrace
> Sent: Wednesday, March 22, 2006 3:36 PM
> To: wdmaudiodev@xxxxxxxxxxxxx
> Subject: [wdmaudiodev] Re: My first WASAPI implementation.
>
>
>> my biggest gripe currently is not knowing if its possible for a
device
> manufacturer to define a huge 16 output (or more) endpoint in one
> IAudioClient without having to fake it with WAVEFORMATEXTENSIBLE's
> nChannels set to 16 and dwChannelMask set to 0x00, or to have that
> manufacturer define a bunch of separate stereo pairs to do the job.
>
> Can you clarify what you would *like* to see here? At this time, we
> feel
> that if the hardware is intended to be used as a 16-channel output,
> then
> it should be presented as a single 16-channel output accessed through
a
> single instance of IAudioRenderClient using a 16-channel
> WAVEFORMATEXTENSIBLE.
>
> Frank Yerrace
> Microsoft Corporation
>
> This posting is provided "AS IS" with no warranties, and confers no
> rights
>
>
> -----Original Message-----
> From: wdmaudiodev-bounce@xxxxxxxxxxxxx
> [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of David Viens
> Sent: Wednesday, March 22, 2006 12:17 PM
> To: wdmaudiodev@xxxxxxxxxxxxx
> Subject: [wdmaudiodev] Re: My first WASAPI implementation.
>
> Ron Kuper wrote:
>> David, were the "suprises" pleasant or unpleasant?
>
> Ha, of course I meant "surprisingly good" results,
> with little to no clicking (but sometimes occurring with even
> moderate DSP cpu loads)
>
> I ran the code with my onboard NVidia AMD nforce4 ac97,
> a Roland ua-1a device running "USB composite device",
> and my Terratec EWS88MT's extra output (fixed at 48 Khz)
> - not the full 12/10 combo which doesnt appear.
> cant try my various SB cards, because of lack of working drivers.
>
> I'm trying to put latency down, but i got tired of shooting in the
dark
> with trying things. Thats why i'm awaiting answers before continuing.
> Knowing that vista is now scheduled to release in 2007, its not that
> urgent it would seem.
> The way it currently works is a bit odd, with the 100-nano second
> "periods"
> settings, which cant seem to fit on even sample frames in some
> circumstances,
> or .. sigh allow for power of two sized buffers.
>
> Also since no pro audio card has Vista drivers yet, my biggest gripe
> currently
> is not knowing if its possible for a device manufacturer to define a
> huge
> 16 output (or more) endpoint in one IAudioClient without having to
fake
> it with
> WAVEFORMATEXTENSIBLE's nChannels set to 16 and dwChannelMask set to
> 0x00,
> or to have that manufacturer define a bunch of separate stereo pairs
to
> do the job.
>
> (i never implemented WDM-KS's pin querrying stuff mind you - so might
> be
> a similar thing)
>
> I've got another bag of questions...
>
> --
> David Viens, Plogue Art et Technologie Inc,
> Montreal. http://www.plogue.com
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