// Inserts "rResource" into the flow graph downstream of the
// designated "rUpstreamResource" resource.
// The new resource will be inserted on the "outPortIdx" output
// link of "rUpstreamResource".
// If the flow graph is not "started", this call takes effect
// immediately. Otherwise, the call takes effect at the start of the
// next frame processing interval.
// Returns OS_SUCCESS if the resource was successfully inserted. Returns
// OS_INVALID_ARGUMENT if the caller specified an invalid port index.
OsStatus MpFlowGraphBase::insertResourceAfter(MpResource& rResource,
MpResource& rUpstreamResource,
int outPortIdx)
{
MpResource *pDownstreamResource;
int downstreamInPortIdx;
OsStatus res;
// Get information about the downstream end of the link
rUpstreamResource.getOutputInfo(outPortIdx, pDownstreamResource,
downstreamInPortIdx);
// Add the new resource to the flow graph
res = addResource(rResource);
if (res != OS_SUCCESS)
return res;
if (pDownstreamResource != NULL)
{
// Remove the link between the upstream and downstream resources
res = removeLink(rUpstreamResource, outPortIdx);
if (res != OS_SUCCESS)
{ // recover from remove link failure
removeResource(rResource);
return res;
}
// Add the link between output port 0 the new resource and the
// downstream resource
res = addLink(rResource, 0, *pDownstreamResource, downstreamInPortIdx);
if (res != OS_SUCCESS)
{ // recover from add link failure
removeResource(rResource);
addLink(rUpstreamResource, outPortIdx,
*pDownstreamResource, downstreamInPortIdx);
return res;
}
}
// Add the link between the upstream resource and input port 0 of
// the new resource
res = addLink(rUpstreamResource, outPortIdx, rResource, 0);
if (res != OS_SUCCESS)
{ // recover from add link failure
removeResource(rResource);
if (pDownstreamResource != NULL)
{
addLink(rUpstreamResource, outPortIdx,
*pDownstreamResource, downstreamInPortIdx);
}
}
return res;
}
