Documentation/media/uapi/dvb/video-fast-forward.rst

   1 .. -*- coding: utf-8; mode: rst -*-
   2
   3 .. _VIDEO_FAST_FORWARD:
   4
   5 ==================
   6 VIDEO_FAST_FORWARD
   7 ==================
   8
   9 Name
  10 ----
  11
  12 VIDEO_FAST_FORWARD
  13
  14
  15 Synopsis
  16 --------
  17
  18 .. cpp:function:: int ioctl(fd, int request = VIDEO_FAST_FORWARD, int nFrames)
  19
  20
  21 Arguments
  22 ---------
  23
  24 .. flat-table::
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  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_FAST_FORWARD for this command.
  40
  41     -  .. row 3
  42
  43        -  int nFrames
  44
  45        -  The number of frames to skip.
  46
  47
  48 Description
  49 -----------
  50
  51 This ioctl call asks the Video Device to skip decoding of N number of
  52 I-frames. This call can only be used if VIDEO_SOURCE_MEMORY is
  53 selected.
  54
  55
  56 Return Value
  57 ------------
  58
  59 On success 0 is returned, on error -1 and the ``errno`` variable is set
  60 appropriately. The generic error codes are described at the
  61 :ref:`Generic Error Codes <gen-errors>` chapter.
  62
  63
  64
  65 .. flat-table::
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  68
  69
  70     -  .. row 1
  71
  72        -  ``EPERM``
  73
  74        -  Mode VIDEO_SOURCE_MEMORY not selected.