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author | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-07-08 11:40:06 -0300 |
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committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-07-08 11:59:40 -0300 |
commit | 60c2820d0f6d3497975b6488e2599f8f611d8b95 (patch) | |
tree | b3b03707c6438ea9b99cc57e847ebf517f968ab1 /Documentation/media/uapi/v4l/vidioc-overlay.rst | |
parent | a97369b5e21ea9b8b5fef7c0f4f48bbe60c07ca3 (diff) | |
download | linux-60c2820d0f6d3497975b6488e2599f8f611d8b95.tar.bz2 |
doc_rst: rename the media Sphinx suff to Documentation/media
The name of the subsystem is "media", and not "linux_tv". Also,
as we plan to add other stuff there in the future, let's
rename also the media uAPI book to media_uapi, to make it
clearer.
No functional changes.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'Documentation/media/uapi/v4l/vidioc-overlay.rst')
-rw-r--r-- | Documentation/media/uapi/v4l/vidioc-overlay.rst | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/Documentation/media/uapi/v4l/vidioc-overlay.rst b/Documentation/media/uapi/v4l/vidioc-overlay.rst new file mode 100644 index 000000000000..191dbc144ef7 --- /dev/null +++ b/Documentation/media/uapi/v4l/vidioc-overlay.rst @@ -0,0 +1,55 @@ +.. -*- coding: utf-8; mode: rst -*- + +.. _VIDIOC_OVERLAY: + +******************** +ioctl VIDIOC_OVERLAY +******************** + +Name +==== + +VIDIOC_OVERLAY - Start or stop video overlay + + +Synopsis +======== + +.. cpp:function:: int ioctl( int fd, int request, const int *argp ) + + +Arguments +========= + +``fd`` + File descriptor returned by :ref:`open() <func-open>`. + +``request`` + VIDIOC_OVERLAY + +``argp`` + + +Description +=========== + +This ioctl is part of the :ref:`video overlay <overlay>` I/O method. +Applications call :ref:`VIDIOC_OVERLAY` to start or stop the overlay. It +takes a pointer to an integer which must be set to zero by the +application to stop overlay, to one to start. + +Drivers do not support :ref:`VIDIOC_STREAMON` or +:ref:`VIDIOC_STREAMOFF <VIDIOC_STREAMON>` with +``V4L2_BUF_TYPE_VIDEO_OVERLAY``. + + +Return Value +============ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + +EINVAL + The overlay parameters have not been set up. See :ref:`overlay` + for the necessary steps. |