Re: Audio DSP plugin for multiple WMP10 Viewers

The Init method passes in a playback context ID that should enable you to
determine which control instance a particular plug-in instance is associated
with.

http://msdn.microsoft.com/library/en-us/wmplay10/mmp_sdk/iwmpplugininitdsp.asp


--
Jim Travis
Microsoft Corp.
Windows Media Player SDK

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"rbrian" <rbrian@xxxxxxxxxxxxxxxx> wrote in message
news:8CE46335-6D11-4D9C-8846-38696BA750F4@xxxxxxxxxxxxxxxx
> We are continuously serving multiple (up to 9) WMP video streams to users.
> To
> monitor these in our operations room, I wrote a VB app to view all the
> streams on one screen. It takes 1 to 9 URLs, scales the viewers to the
> frame,
> and displays the video. Audio can be selected from one viewer at a time to
> the default sound device, by muting all but one viewer.
> The next request was to visually monitor the audio for all streams (e.g.
> on-screen Vu meters) to detect if audio died on any channel. Using the
> Audio
> DSP plugin wizard, I modified the code to view audio (two rectangles -
> left &
> right - fed from IMediaObject::ProcessOutput).
>
> Problem - ALL the audio data from all streams are fed to this routine,
> with
> no obvious way to separate the data buffers according to the source
> viewer.
> So, all audio data comes into the same routine, and gets combined into one
> display. The IMediaObject doesn't appear to have any source associated
> with
> the buffers, that I could use to select the stream source. Even running
> multiple instances of the app resulted in all data getting combined and
> displayed in the active window.
>
> 1) Is it possible to separate the data in an Audio DSP plugin?
> 2) Is there another way (preferable do-able by a novice c programmer) to
> do
> this? (I tried others, but I don't think a visualization works
> simultaneously
> with Video - and as a plugin it may have the same data separation issue
> anyway?)
> 3) Any commercial app out there that does this?


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