Re: Supporting KSPROPERTY_PIN_CONSTRAINEDDATARANGES under AVStream

Hi Tim,

Thanks again for replying, I really appreciate that =)

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.

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

.

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