Synopsis
========
-.. cpp:function:: int ioctl( int fd, int request, v4l2_std_id *argp )
+.. c:function:: int ioctl( int fd, VIDIOC_QUERYSTD, v4l2_std_id *argp )
+ :name: VIDIOC_QUERYSTD
Arguments
``fd``
File descriptor returned by :ref:`open() <func-open>`.
-``request``
- VIDIOC_QUERYSTD
-
``argp``
the set must contain all standards supported by the current video input
or output.
-.. note:: Drivers shall *not* switch the video standard
+.. note::
+
+ Drivers shall *not* switch the video standard
automatically if a new video standard is detected. Instead, drivers
should send the ``V4L2_EVENT_SOURCE_CHANGE`` event (if they support
this) and expect that userspace will take action by calling