CBaseRenderer Class

项目
06/30/2006

This is the base renderer class for writing renderers. This class handles a single input pin, all state changes, and synchronization.

Protected Data Members

Member	Description
m_bAbort	Stop rendering data.
m_bEOS	Indicator for whether there are more samples in the stream.
m_bEOSDelivered	Indicator for whether an EC_COMPLETE event has been delivered.
m_bRepaintStatus	Flag to determine if an EC_REPAINT message can be signaled.
m_bStreaming	Indicator for whether the filter graph is currently streaming.
m_dwAdvise	Timer advise token returned by the clock.
m_EndOfStreamTimer	Time that specifies the end of the stream.
m_evComplete	Event signaled when the pause state is complete.
m_InterfaceLock	Critical section for interfaces.
m_pInputPin	Renderer input pin object.
m_pMediaSample	Current media sample about to be, or being rendered.
m_pPosition	CRendererPosPassThru object for passing positioning data upstream.
m_pQSink	Quality control sink.
m_RendererLock	Controller for access to current media sample.
m_RenderEvent	Used to signal timer events.
m_SignalTime	Amount of time that must elapse before CBaseRenderer returns EC_COMPLETE.
m_ThreadSignal	Event signaled to release the source filter thread.

Member Functions

Member function	Description
Active	Called when the state is switched to paused or running. Override to add functionality.
CBaseRenderer	Constructs a CBaseRenderer object.
CheckReady	Determines if the event is set.
DisplayRendererState	Displays the status of the video renderer. This function is available only in debug mode.
GetRealState	Retrieves the actual state of the renderer.
GetRenderEvent	Retrieves the event to render.
IsEndOfStream	Determines if the end of the stream has been reached.
IsEndOfStreamDelivered	Determines if the end of the stream has been delivered to the filter graph manager.
IsStreaming	Determines if the filter is currently rendering data.
NotifyEndOfStream	Sends an EC_COMPLETE event to the filter graph manager.
NotReady	Forces the m_evComplete event into a nonsignaled state.
Ready	Puts the m_evComplete event into a signaled state.
ResetEndOfStreamTimer	Sets the end of stream timer to zero.
ScheduleSample	Sets up an advise link with the clock.
SendNotifyWindow	Passes the notification window handle to the upstream filter.
SendRepaint	Conditionally signals an EC_REPAINT message to the filter graph.
SetAbortSignal	Sets the abort signal flag.
SetRepaintStatus	Resets the repaint status flag.
SignalTimerFired	Resets the current advise time to zero after a timer fires.
TimerCallback	Checks if it is time to signal the end of the current data stream.

Overrideable Member Functions

Member function	Description
BeginFlush	Signals the start of flushing on the input pin.
BreakConnect	Breaks the input pin connection and resets the end-of-stream flags.
CancelNotification	Cancels any currently scheduled notification with the clock.
CheckMediaType	Determines if the renderer will accept a given media type.
ClearPendingSample	Called to release the pending sample after it has been rendered.
CompleteConnect	Called as part of the connection protocol. Override to add functionality.
CompleteStateChange	Ensures that a sample is waiting before allowing a pause.
DoRenderSample	Called when a sample is ready to render.
EndFlush	Called when the input pin receives an end-flush notification.
EndOfStream	Called when the input pin receives an end-of-stream notification.
GetCurrentSample	Retrieves the current sample waiting at the video renderer.
GetPin	Returns a CBasePin object to the renderer.
GetPinCount	Returns the number of input pins supported.
GetMediaPositionInterface	Retrieves IMediaPosition and IMediaSeeking interfaces for the video renderer.
GetSampleTimes	Retrieves sample time information for this sample.
HaveCurrentSample	Determines if a sample is waiting at the renderer.
Inactive	Called when going into a stopped state. Override to add functionality.
NonDelegatingQueryInterface	Returns an interface and increments the reference count.
OnReceiveFirstSample	Provides derived classes with an opportunity to render static data.
OnRenderEnd	Notifies the derived class that a sample has just finished rendering.
OnRenderStart	Notifies the derived class that a sample is about to be rendered.
OnStartStreaming	Notifies the derived class that rendering has started.
OnStopStreaming	Notifies the derived class that rendering has stopped.
OnWaitEnd	Notifies the derived class that a wait for a rendering time has just ended.
OnWaitStart	Notifies the derived class that a wait for a rendering time is about to start.
Pause	Tells the renderer to transition to the new (paused) state.
PrepareReceive	Called to schedule a clock time when the renderer receives a sample.
PrepareRender	Allows derived classes to set themselves just before a sample is rendered.
Receive	Called by the source filter when a sample is available to render.
Render	Asks the derived class to render the sample.
ResetEndOfStream	Resets the end-of-stream flag.
Run	Transitions the renderer to State_Running if it is not already in this state.
SendEndOfStream	Sets the end-of-stream flag.
SetMediaType	Informs the derived class of the selected media type.
ShouldDrawSampleNow	Determines if the sample should be drawn between the start and stop times given.
SourceThreadCanWait	Sets or resets the thread event.
StartStreaming	Called to schedule any pending sample with the clock, and to display any timing information.
Stop	Tells the renderer to transition to the new (stopped) state.
StopStreaming	Sets an internal flag to indicate not to schedule arrival of any more samples.
WaitForRenderTime	Waits for either the time to arrive or for rendering to be stopped.

Implemented IMediaFilter Methods

Method	Description
GetState	Determines the state of the renderer.

Implemented IBaseFilter Methods

Method	Description
FindPin	Retrieves a pointer to the pin with the specified identifier. (There is only one pin.)

Helper Function

Function	Description
WaitForReceiveToComplete	Waits for the CBaseRenderer::Receive method to complete.

Requirements

DirectShow applications and DirectShow filters have different include file and link library requirements. See Setting Up the Build Environment for more information.

OS Versions: Windows CE 2.12 and later. Version 2.12 requires DXPAK 1.0 or later.
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Last updated on Wednesday, April 13, 2005

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