tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1.. -*- coding: utf-8; mode: rst -*-
2
3.. _VIDEO_GET_FRAME_RATE:
4
5====================
6VIDEO_GET_FRAME_RATE
7====================
8
9Name
10----
11
12VIDEO_GET_FRAME_RATE
13
14
15Synopsis
16--------
17
18.. cpp:function:: int ioctl(int fd, int request = VIDEO_GET_FRAME_RATE, unsigned int *rate)
19
20
21Arguments
22---------
23
24.. flat-table::
25 :header-rows: 0
26 :stub-columns: 0
27
28
29 - .. row 1
30
31 - int fd
32
33 - File descriptor returned by a previous call to open().
34
35 - .. row 2
36
37 - int request
38
39 - Equals VIDEO_GET_FRAME_RATE for this command.
40
41 - .. row 3
42
43 - unsigned int \*rate
44
45 - Returns the framerate in number of frames per 1000 seconds.
46
47
48Description
49-----------
50
51This ioctl call asks the Video Device to return the current framerate.
52
53
54Return Value
55------------
56
57On success 0 is returned, on error -1 and the ``errno`` variable is set
58appropriately. The generic error codes are described at the
59:ref:`Generic Error Codes <gen-errors>` chapter.