XSGIvcSetOutputPhaseV(3)

     NAME
          XSGIvcSetOutputPhaseV, XSGIvcQueryOutputPhaseV - Video
          Vertical Phase Operations

     SYNOPSIS
          #include <X11/extensions/XSGIvc.h>

          void XSGIvcSetOutputPhaseV(Display *display,
              int screen,
              int channel,
              int phaseV)

          Status XSGIvcQueryOutputPhaseV(Display *display,
              int screen,
              int channel,
              int *phaseVReturn)

     PARAMETERS
          display     Specifies the connection to the X server.

          screen      Specifies the screen of the X server.

          channel     Specifies the channel number.

          phaseV      The value to which the vertical phase should be
                      set.

          phaseVReturn
                      Returns the value to which the vertical phase is
                      set.


     DESCRIPTION
          These functions allow alteration and query of the vertical
          phase relationship to genlock input (also known as genlock
          delay).  This control is only active when the server is
          locked to an external source.  The units are specified in
          terms of lines, such that:

            1 unit = 1 line

          Accuracy is not guaranteed because of variations in
          hardware, but will be close to the value you specify.
          Precision depends upon server implementation and is not
          guaranteed to be uniform across the full range.  You should
          get the current setting from the server after a set
          operation to determine the value to which the server is set.

          The function XSGIvcQueryChannelInfo returns the range of
          values that are valid on this channel.

          XSGIvcSetOutputPhaseV sets the video vertical phase of a
          channel.

          XSGIvcQueryOutputPhaseV returns the current settings of the
          vertical phase of a channel.


     EVENTS
          When this control is altered, the server generates a
          OutputPhaseVNotify event.


     RETURNED VALUE
          XSGIvcQueryOutputPhaseV returns TRUE if successful, FALSE
          upon failure.  Parameter errors are reported via BadValue or
          BadMatch.


     SEE ALSO
          XSGIvc