## Q

quality management protocol
  A protocol that defines how the filter graph adapts dynamically to hardware and network conditions to increase or decrease the media data flow. The IQualityControl interface is used to send quality control notifications from a renderer to an upstream filter or directly to a designated quality control manager, if one exists. (See quality sink.) The base classes implement passing quality control notifications upstream by providing the IQualityControl interface on the output pins of filters. Quality control notification uses a Quality structure, which indicates whether the renderer is overloaded or underloaded.
quality sink
  A filter object designated by the IQualityControl::SetSink method to receive quality messages. When IQualityControl::SetSink is called, the filter is instructed not to send quality control messages upstream, but rather to send them to the object passed to the SetSink method. This object is called a quality-control manager. See quality management protocol.

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