IAMLatency interface (strmif.h)
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The IAMLatency
interface reports the amount of latency that a filter introduces into the graph. Latency is defined as the time that it takes the filter to process a sample. For a source filter, latency is the filter's maximum buffer size, measured in time. For example, a video capture filter that buffers one frame at 30 frames per second introduces a latency of about 33 milliseconds.
Currently, there is no support for using this interface by itself. A source filter that streams live or real-time data should implement the IAMPushSource interface, which inherits from this interface.
The IAMLatency interface inherits from the IUnknown interface. IAMLatency also has these types of members:
The IAMLatency interface has these methods.
IAMLatency::GetLatency The GetLatency method retrieves the expected latency associated with this filter. |
Requirement | Value |
---|---|
Minimum supported client | Windows XP [desktop apps only] |
Minimum supported server | Windows Server 2003 [desktop apps only] |
Target Platform | Windows |
Header | strmif.h (include Dshow.h) |