[wdmaudiodev] Re: AVStream-based MIDI support
- From: Eugene Gavrilov <egavrilov@xxxxxxxxxxxxx>
- To: Matt Gonzalez <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Fri, 30 Jun 2006 01:39:43 +0400
Hello Matt,
Sorry, I've just noticed your reply to my question. Glad to meet you
here!
> In that case, I think you'd want to do this:
> KsStreamPointerAdvanceOffsets(LeadingEdgeStreamPointer,0,12,FALSE)
> 4 bytes for the timestamp + 4 bytes for the ByteCount field + 4 bytes
> for the MIDI data.
Yep, I implemented in similar way, but had to use
KsStreamPointerAdvance() instead of AdvanceOffsets(). This worked
fine. (The problem was with SysEx data and one unnecessary byte for
regular MIDI data).
> It's not documented or anything, but it worked for me.
Yes. We even sent a request to Microsoft and got some clarifications,
but there was a minor issue - additional zeroes sent to the
application. It was possible to solve this only by using
KsStreamPointerAdvance(). (Strangely, AdvanceOffsets() was supposed to
produce the same result, but it did not).
Regards,
Eugene Gavrilov
Software Engineer,
CEntrance, Inc.
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