[wdmaudiodev] Re: Few Questions on AVStream
- From: Tim Roberts <timr@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Wed, 07 Jan 2009 10:36:05 -0800
swapnil kamble wrote:
>
> I have capture filter with orphan pin that is used
> as a capture pin. Now I made this filter registered under "Audio
> Capture Sources". It appears there too.
> Correct me, if I am wrong.
> I am trying get the sink pin of the filter that we
> built, as capture pin. Because that's the only pin that appears in the
> Capture Filter.
I don't understand this. Is it a capture filter (which has a source
pin) or a render filter (which has a sink pin)?
> So Pin Struct is
>
> Sink Pin =
> {
> &AudioCapturePinDispatch,
> NULL,
> {
> SIZEOF_ARRAY( PinInterfaces_Wave ),
> (KSPIN_INTERFACE*) &PinInterfaces_Wave,
> SIZEOF_ARRAY( PinMediums_Wave ),
> (KSPIN_MEDIUM*) &PinMediums_Wave,
> SIZEOF_ARRAY( PinAudioFormatRanges_WaveSink ),
> PinAudioFormatRanges_WaveSink,
> KSPIN_DATAFLOW_OUT,
> KSPIN_COMMUNICATION_SINK,
> &KSCATEGORY_AUDIO, // Category
> &g_PINNAME_AUDIO_CAPTURE, // Name
> 0
> },
A sink pin will not have dataflow going OUT. Sinks have data coming
IN. The name comes from plumbing. Your sink has water coming IN. The
faucet is the source.
> 2.from KSPIN_COMMUNICATION_BOTH to
> KSPIN_COMMUNICATION_SINK,
>
> 3. from NULL to
> SIZEOF_ARRAY( PinInterfaces_Wave ),
> (KSPIN_INTERFACE*) &PinInterfaces_Wave,
> SIZEOF_ARRAY( PinMediums_Wave ),
> (KSPIN_MEDIUM*) &PinMediums_Wave,
>
> These are basically must for getting driver under "Audio Capture
> Sources".
For an audio capture source, you do not want KSPIN_COMMUNICATION_SINK.
Use either SOURCE or BOTH.
> 1. when I right click on my Capture Pin and chooses "Render this Pin"
> my IntersectHandler and DispatchSetFormat and DispatchSetCreate are
> invoked repeatedly. And all call succeeds to return SUCSESS. But error
> comes as "Filter Graph Can't Render this pin....No h/w avaialable with
> error code (0x80040256)"
That's VFW_E_NO_AUDIO_HARDWARE. Do you actually have a sound card in
this computer?
--
Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.
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