Computer with a video subsystem that contains timers which are used to create calibration tables correlating time intervals with the decoding and converting of video input signals

摘要

An apparatus and method for modifying the functionality of a computer system based on the dynamically determined operational capabilities of the system is disclosed. The system includes: 1) a video input component for receiving a video input stream including a plurality of video frames encoded in one of a plurality of available video formats; 2) a video decode component coupled to the video input component for decompressing and decoding the video input stream thereby producing a decoded video input stream in a different one of the plurality of available video formats; 3) a video adapter component coupled to the video decode component for converting the decoded video input stream to one of a plurality of available display resolutions; 4) a first timer for measuring a first time interval required by the video decode component to complete decompression and decode of one or more of the video frames of the plurality of video frames; and 5) a second timer for measuring a second time interval required by the video adapter component to complete conversion of the decoded video input stream. The time intervals are stored in calibration tables which can be used to resize a pair of video windows displayed on a video display device.