MFBeginRegisterWorkQueueWithMMCSSEx function (mfapi.h)

Associates a work queue with a Multimedia Class Scheduler Service (MMCSS) task.

Syntax

HRESULT MFBeginRegisterWorkQueueWithMMCSSEx(
  [in] DWORD            dwWorkQueueId,
  [in] LPCWSTR          wszClass,
  [in] DWORD            dwTaskId,
  [in] LONG             lPriority,
  [in] IMFAsyncCallback *pDoneCallback,
  [in] IUnknown         *pDoneState
);

Parameters

[in] dwWorkQueueId

The identifier of the work queue. For private work queues, the identifier is returned by the MFAllocateWorkQueue function. For platform work queues, see Work Queue Identifiers.

[in] wszClass

The name of the MMCSS task. For more information, see Multimedia Class Scheduler Service.

[in] dwTaskId

The unique task identifier. To obtain a new task identifier, set this value to zero.

[in] lPriority

The base relative priority for the work-queue threads. For more information, see AvSetMmThreadPriority.

[in] pDoneCallback

A pointer to the IMFAsyncCallback interface of a callback object. The caller must implement this interface.

[in] pDoneState

A pointer to the IUnknown interface of a state object, defined by the caller. This parameter can be NULL. You can use this object to hold state information. The object is returned to the caller when the callback is invoked.

Return value

If this function succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Remarks

This function extends the MFBeginRegisterWorkQueueWithMMCSS function by adding the lPriority parameter.

This function is asynchronous. When the operation completes, the callback object's IMFAsyncCallback::Invoke method is called. At that point, call MFEndRegisterWorkQueueWithMMCSS to complete the asynchronous request.

To unregister the work queue from the MMCSS task, call MFBeginUnregisterWorkQueueWithMMCSS.

Requirements

See also

Media Foundation Functions

Work Queue and Threading Improvements

Work Queues