[wdmaudiodev] Re: avstream for audio capture sources
- From: Tim Roberts <timr@xxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Tue, 16 Aug 2016 17:02:36 -0700
若水 wrote:
Dear Tim Roberts:
Thank you for help. My base sample is avshws code. It is a video
sample, not an audio-only sample. If I have an audio-only sample,
maybe I could find my bug easy. Could you give me an audio-only
sample? Thanks.
The avshws sample is a fine start, but it only has a video pin. To turn
this into an audio sample, you'll need to change the category list to
include KSCATEGORY_AUDIO, and of course you'll have to change the
datatypes to audio types. The avssamp sample includes both a video and
an audio pin, and can give you examples of the structure's you'll need.
It shouldn't take much more than that to get you listed as a source in
DirectShow. To be recognized as a system audio device outside of
DirectShow, there are some more things you must do. You must have at
least one internal node, which means you need a KSNODE_DESCRIPTOR and a
KSTOPOLOGY_CONNECTION structure in your KSFILTER_DESCRIPTOR. These can
be very simple, but they must be present.
--
Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.
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