ACX_EVENT_CALLBACKS structure (acxevents.h)
The ACX_EVENT_CALLBACKS structure identifies the driver callbacks for ACX event operations.
Syntax
typedef struct _ACX_EVENT_CALLBACKS {
ULONG Size;
PFN_ACX_EVENT_ENABLE EvtAcxEventEnable;
PFN_ACX_EVENT_DISABLE EvtAcxEventDisable;
PFN_ACX_OBJECT_PROCESS_EVENT_REQUEST EvtAcxEventProcessRequest;
} ACX_EVENT_CALLBACKS, *PACX_EVENT_CALLBACKS;
Members
Size
The length, in bytes, of this structure.
EvtAcxEventEnable
The EVT_ACX_EVENT_ENABLE callback.
EvtAcxEventDisable
The EVT_ACX_EVENT_DISABLE callback.
EvtAcxEventProcessRequest
The EVT_ACX_OBJECT_PROCESS_EVENT_REQUEST callback.
Remarks
An ACXEVENT represents an asynchronous notification available at the driver level. Events can be added to ACXCIRCUITs, ACXSTREAMs, ACXELEMENTs and ACXPINs. Internally they are exposed as KS Events to upper layers. For more information about KS Events, see KS Events.
Example
This example shows the use of ACX_EVENT_CALLBACKS.
ACX_EVENT_CALLBACKS eventCallbacks;
ACX_EVENT_CONFIG eventCfg;
//
// Add enable/disable callbacks for this element.
//
ACX_EVENT_CALLBACKS_INIT(&eventCallbacks);
eventCallbacks.EvtAcxEventEnable = &TestElement::EvtEventEnableCallback;
eventCallbacks.EvtAcxEventDisable = &TestElement::EvtEventDisableCallback;
ACX_EVENT_CONFIG_INIT(&eventCfg);
eventCfg.Set = &KSEVENTSETID_AudioControlChange;
eventCfg.Id = KSEVENT_CONTROL_CHANGE;
eventCfg.Callbacks = &eventCallbacks;
ACX requirements
Minimum ACX version: 1.0
For more information about ACX versions, see ACX version overview.
Requirements
| Requirement | Value |
|---|---|
| Header | acxevents.h |