summaryrefslogtreecommitdiff
path: root/Documentation/linux_tv/media/dvb/video-fast-forward.rst
blob: db338e9f5379c7a3d02aa0a029fd588c023c63a9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
.. -*- coding: utf-8; mode: rst -*-

.. _VIDEO_FAST_FORWARD:

==================
VIDEO_FAST_FORWARD
==================

Name
----

VIDEO_FAST_FORWARD


Synopsis
--------

.. cpp:function:: int ioctl(fd, int request = VIDEO_FAST_FORWARD, int nFrames)


Arguments
---------

.. flat-table::
    :header-rows:  0
    :stub-columns: 0


    -  .. row 1

       -  int fd

       -  File descriptor returned by a previous call to open().

    -  .. row 2

       -  int request

       -  Equals VIDEO_FAST_FORWARD for this command.

    -  .. row 3

       -  int nFrames

       -  The number of frames to skip.


Description
-----------

This ioctl call asks the Video Device to skip decoding of N number of
I-frames. This call can only be used if VIDEO_SOURCE_MEMORY is
selected.


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.



.. flat-table::
    :header-rows:  0
    :stub-columns: 0


    -  .. row 1

       -  ``EPERM``

       -  Mode VIDEO_SOURCE_MEMORY not selected.