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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /Documentation/userspace-api/media/v4l/vidioc-overlay.rst | |
parent | Initial commit. (diff) | |
download | linux-430c2fc249ea5c0536abd21c23382884005c9093.tar.xz linux-430c2fc249ea5c0536abd21c23382884005c9093.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'Documentation/userspace-api/media/v4l/vidioc-overlay.rst')
-rw-r--r-- | Documentation/userspace-api/media/v4l/vidioc-overlay.rst | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/Documentation/userspace-api/media/v4l/vidioc-overlay.rst b/Documentation/userspace-api/media/v4l/vidioc-overlay.rst new file mode 100644 index 000000000..f2efaaba2 --- /dev/null +++ b/Documentation/userspace-api/media/v4l/vidioc-overlay.rst @@ -0,0 +1,52 @@ +.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later +.. c:namespace:: V4L + +.. _VIDIOC_OVERLAY: + +******************** +ioctl VIDIOC_OVERLAY +******************** + +Name +==== + +VIDIOC_OVERLAY - Start or stop video overlay + +Synopsis +======== + +.. c:macro:: VIDIOC_OVERLAY + +``int ioctl(int fd, VIDIOC_OVERLAY, const int *argp)`` + +Arguments +========= + +``fd`` + File descriptor returned by :c:func:`open()`. + +``argp`` + Pointer to an integer. + +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. |