[wdmaudiodev] Re: MSVAD multistr multiple streams supported or NOT !!!!
- From: Tim Roberts <timr@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Fri, 13 Mar 2009 10:17:03 -0700
Vipin Kumar wrote:
> Hi,
> Thanks for the reply.
>
> if only single stream is supported then what's the difference between
> MSVAD simple and MSVAD multstr ?????
I didn't say "only single stream is supported". I said that the
operating system will route all unsophisticated application streams to
the kernel mixer, and then route that single mixed output stream to your
driver. A sophisticated application certainly could instantiate your
device and route multiple streams directly into it, bypassing the kernel
mixers. The vast majority of applications don't do that, and as a
result the "multiple stream" support isn't widely useful.
> and why this comment exists ( code to process multiple streams is
> below the comment) in minwave.cpp in multstr directory
>
> minwave.cpp in multstr LINE no. 322
>
> // This version supports multiple playback streams.
> //
>
> can you please throw some light in here ( if we don't support multiple
> streams then why the code is written to support multiple streams ?? )
You can certainly support multiple streams, but they can only be used by
applications that expect to talk to devices with multiple streams.
Again, the vast majority of applications just route their output to the
default sound device, which feeds to the kernel mixer, and from there
into a single stream in your device.
> Actually i am writing a terminal services auduo output/input stuff.
> so all the users will select one audio device, and it will handle all
> the streams ( one stream for one user or session) and so on.
What do you expect to do with this data? Do you understand that
Terminal Services already supports routing audio to and from the client?
--
Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.
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