XSGIvcSetOutputPhaseH(3)

     NAME
          XSGIvcSetOutputPhaseH, XSGIvcQueryOutputPhaseH - Video
          Horizontal Phase Operations

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

          void XSGIvcSetOutputPhaseH(Display *display,
              int screen,
              int channel,
              int phaseH)

          Status XSGIvcQueryOutputPhaseH(Display *display,
              int screen,
              int channel,
              int *phaseHReturn)

     PARAMETERS
          display     Specifies the connection to the X server.

          screen      Specifies the screen of the X server.

          channel     Specifies the channel number.

          phaseH      The value to which the horizontal phase should
                      be set.

          phaseHReturn
                      Returns the value to which the horizontal phase
                      is set.


     DESCRIPTION
          These functions allow alteration and query of the horizontal
          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 pixels, such that:

            1 unit = 0.01 pixels

          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.

          Note that this function is valid only when the server is
          genlocked to an external source; it is not valid when the
          server is framelocked or is in frame reset mode.

          XSGIvcSetOutputPhaseH sets the video horizontal phase of a
          channel.

          XSGIvcQueryOutputPhaseH returns the current settings of the
          horizontal phase of a channel.


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


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


     SEE ALSO
          XSGIvc(3), XSGIvcSetScreenInputSyncSource(3)