This is needed since it is often required to atomically changeĮach of the new ioctls expects a pointer to a structĬontains a pointer to the control array, a count of the number ofĬontrols in that array and a control class. VIDIOC_S_CTRL ioctls that act on a singleĬontrol). TheĮxtended Controls API as well as all Extended Controls classes are These new uses and so it was extended into the (not terribly originallyĮven though the MPEG encoding API was the first effort to use theĮxtended Control API, nowadays there are also other classes of ExtendedĬontrols, such as Camera Controls and FM Transmitter Controls. Unfortunately, the original control API lacked some features needed for Of the resulting MPEG stream, not how the video is actually encoded into The MPEG encoding chip since the MPEG standard only defines the format Relating to how the video is encoded into an MPEG stream are specific to Large and the currently supported hardware MPEG encoders each only Implementing this extended control mechanism: the MPEG standard is quite The MPEG encoding API was the driving force behind designing and Where each driver implements only a subset of a larger API. However, it turned out toīe a very useful model for implementing more complicated driver APIs User settings (brightness, saturation, etc). The control mechanism as originally designed was meant to be used for
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