![]() ![]() The EC_COMPLETE notification should be sent only once by a renderer each time it reaches the end of a stream. Once all remaining data has been received, the renderer should send an EC_COMPLETE notification to the Filter Graph Manager. A renderer should note this notification and continue to render any data it has already received. Renderers have special responsibilities when it comes to handling these notifications.Ī renderer receives an end-of-stream notification when its input pin's IPin::EndOfStream method is called by the upstream filter. It is passed through every filter in the graph and eventually ends at the renderer, which is responsible for subsequently sending an EC_COMPLETE notification to the Filter Graph Manager. Handling End-of-stream and Flushing NotificationsĪn end-of-stream notification begins at an upstream filter (such as the source filter) when that filter detects that it can send no more data. This topic discusses the responsibility of the renderer filter in handling stream notifications it receives and in sending appropriate filter graph notifications. Often, the Filter Graph Manager passes through the events it receives to the application. An application calls the IMediaEvent::GetEvent method on the Filter Graph Manager to retrieve these events. Application notifications, which are retrieved from the Filter Graph Manager by the controlling application.This is accomplished by calling the IMediaEventSink::Notify method on the Filter Graph Manager. Filter graph notifications, which are events sent from a filter to the Filter Graph Manager such as EC_COMPLETE.These can be begin-flushing, end-flushing or end-of-stream notifications and are sent by calling the appropriate method on the downstream filter's input pin (for example IPin::BeginFlush). Stream notifications, which are events that occur in the media stream and are passed from one filter to the next.There are essentially three kinds of notifications that occur in DirectShow: A brief review of DirectShow notifications might help to set the stage. ![]() This topic discusses many notifications that a renderer is responsible for handling. Because of the ongoing development of DirectShow, review your implementation periodically to ensure that the renderers are compatible with the most recent version of DirectShow. You can use the CBaseRenderer and CBaseVideoRenderer classes to help follow these guidelines when implementing an alternative video render. For alternative renderers to interact correctly with DirectShow-based applications, the renderers must adhere to the guidelines outlined in this article. You can use the DirectShow base classes to write alternative video renderers. Microsoft DirectShow provides a window-based video renderer it also provides a full-screen renderer in the run-time installation. VMR Renderless Playback Mode (Custom Allocator-Presenters).For more information, see the following topics: This approach will give you all of the benefits of the VMR/EVR, including support for DirectX Video Acceleration (DXVA), hardware deinterlacing, and frame stepping, and is likely to be more robust than a custom video renderer. Instead of writing a custom video renderer, it is recommended that you write a plug-in allocator-presenter for the Video Mixing Renderer (VMR) or Enhanced Video Renderer (EVR). ![]()
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