[wdmaudiodev] KSPIN_TOPO_XXX numbering question
- From: "Don Bell" <0dbell@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Wed, 18 Apr 2007 12:01:44 -0500
I am trying to understand the numbering (indexing) scheme of topology
pins and I was looking at the MSVAD Simple sample to try to correlate
this with what I understood (or didn't understand) so far.
In mintopo.cpp there is an ASCII diagram that describes the topology
for the Simple driver:
(you need to view this in monospaced font)
/*********************************************************************
* Topology/Wave bridge connection *
* *
* +------+ +------+ *
* | Wave | | Topo | *
* | | | | *
* Capture <---|0 1|<===|4 1|<--- Synth *
* | | | | *
* Render --->|2 3|===>|0 | *
* +------+ | | *
* | 2|<--- Mic *
* | | *
* | 3|---> Line Out *
* +------+ *
*********************************************************************/
In case the above couldn't display properly I will summarize here the
pin numbers according to the diagram (notice, the start from 0):
0. Capture
1. Render
2. Synth
3. Mic
4. Line Out
However, in simple.h the topology pin seem to be numbered differently:
// topology pins.
enum
{
KSPIN_TOPO_WAVEOUT_SOURCE = 0,
KSPIN_TOPO_SYNTHOUT_SOURCE,
KSPIN_TOPO_SYNTHIN_SOURCE,
KSPIN_TOPO_MIC_SOURCE,
KSPIN_TOPO_LINEOUT_DEST,
KSPIN_TOPO_WAVEIN_DEST
};
Not only they are numbered differently, there are 6 pins vs. only 5 in
the diagram.
What is the source of the discrepancy here? What am I missing?
Is it possible that the above enum is not really being used in the
Simple sample?
If so, how come KSPIN_TOPO_SYNTHOUT_SOURCE, for example, is being used
in PCCONNECTION_DESCRIPTOR MiniportConnections[] in toptable.h?
Thanks for any tip that could clarify my confusion.
Don
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