IAMStats interface (control.h)

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The IAMStats interface retrieves performance data from the Filter Graph Manager. Filters can use this interface to record performance data.

Filter developers: As with all Filter Graph Manager interfaces, a filter must not hold a reference count on this interface, or it will cause a circular reference count. For more information, see IBaseFilter::JoinFilterGraph.

Inheritance

The IAMStats interface inherits from the IDispatch interface. IAMStats also has these types of members:

Methods

The IAMStats interface has these methods.

IAMStats::AddValue The AddValue method records a new value.
IAMStats::get_Count The get_Count method retrieves the number of statistics.
IAMStats::GetIndex The GetIndex method retrieves the index for a named statistic, or creates a new statistic.
IAMStats::GetValueByIndex The GetValueByIndex method retrieves a statistic, by index.
IAMStats::GetValueByName The GetValueByName method retrieves a statistic, by name.
IAMStats::Reset The Reset method resets all statistics to zero.

Remarks

Each statistic is defined by a name and an index. Use the GetIndex method to find the index from the name. Values are always double types. The following statistics are predefined.

Name	Description
RenderFile	Measures the time taken by each call to IGraphBuilder::RenderFile.
ConnectDirectInternal	Measures the time taken to connect two filters.
Build Mapper Cache	Measures the time taken to cache information about registered filters (used by the Filter Mapper object).
Process Category CategoryName	Measures the time taken to cache information about filters in a particular category, where CategoryName is the friendly name of the filter category. (See Filter Categories.)

 

For each of these statistics, the values represent time in milliseconds.

Requirements

Requirement	Value
Minimum supported client	Windows XP [desktop apps only]
Minimum supported server	Windows Server 2003 [desktop apps only]
Target Platform	Windows
Header	control.h (include Dshow.h)

See also

IDispatch