Re: Supporting KSPROPERTY_PIN_CONSTRAINEDDATARANGES under AVStream

yinmun <yinmun@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
>I have tried the method you proposed, but when I tried to retrieve the pin
>properties of my filter loaded using GraphEdit, it'll prompt me KSPROXY.AX
>encountered Access Violation error.
>
>My approach is as follows, please advise and point out my mistake, thanks.

Well, I see a mistake, but I'm not sure it's related. You don't set
IoStatus.Information in the "success" case.

I'm still confused as to why you have to do this. If you have your data
structures set up properly, AVStream should be handling this property for
you automatically.

> PKSMULTIPLE_ITEM pItem;
> PKSDATAFORMAT pDataRangePtr;
> switch(pKsProperty->Id)
> {
> case KSPROPERTY_PIN_CONSTRAINEDDATARANGES:
> {
> ULONG ulOutputSize = IoGetCurrentIrpStackLocation(pIrp) ->
>
>Parameters.DeviceIoControl.OutputBufferLength;
>
> int nCount = 1;
> int nMinBufferSize = sizeof(KSMULTIPLE_ITEM) +
> (nCount *
>(sizeof(KSDATAFORMAT)));
>
> if(pData != NULL && ulOutputSize >= nMinBufferSize)
> {
> pItem = (PKSMULTIPLE_ITEM)pData;
> pItem->Count = nCount;
> pItem->Size = nMinBufferSize;
>
> pDataRangePtr = (PKSDATAFORMAT)(pItem + 1);
> for(i = 0; i < nCount; i++)
> {
> RtlCopyMemory(pDataRangePtr,
> PinDefaultDataRanges[i],
> sizeof(KSDATAFORMAT));
> pDataRangePtr++;
> }

pIrp->IoStatus.Information = nMinBufferSize;

> Status = STATUS_SUCCESS;
> }
> else
> {
> pIrp->IoStatus.Information = nMinBufferSize;
> Status = STATUS_BUFFER_OVERFLOW;
> }
> }
> break;

--
- Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc
.

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