Documentation/media/uapi/dvb/video-command.rst

   1 .. -*- coding: utf-8; mode: rst -*-
   2
   3 .. _VIDEO_COMMAND:
   4
   5 =============
   6 VIDEO_COMMAND
   7 =============
   8
   9 Name
  10 ----
  11
  12 VIDEO_COMMAND
  13
  14 .. attention:: This ioctl is deprecated.
  15
  16 Synopsis
  17 --------
  18
  19 .. c:function:: int ioctl(int fd, VIDEO_COMMAND, struct video_command *cmd)
  20     :name: VIDEO_COMMAND
  21
  22
  23 Arguments
  24 ---------
  25
  26 .. flat-table::
  27     :header-rows:  0
  28     :stub-columns: 0
  29
  30
  31     -  .. row 1
  32
  33        -  int fd
  34
  35        -  File descriptor returned by a previous call to open().
  36
  37     -  .. row 2
  38
  39        -  int request
  40
  41        -  Equals VIDEO_COMMAND for this command.
  42
  43     -  .. row 3
  44
  45        -  struct video_command \*cmd
  46
  47        -  Commands the decoder.
  48
  49
  50 Description
  51 -----------
  52
  53 This ioctl is obsolete. Do not use in new drivers. For V4L2 decoders
  54 this ioctl has been replaced by the
  55 :ref:`VIDIOC_DECODER_CMD` ioctl.
  56
  57 This ioctl commands the decoder. The ``video_command`` struct is a
  58 subset of the ``v4l2_decoder_cmd`` struct, so refer to the
  59 :ref:`VIDIOC_DECODER_CMD` documentation for
  60 more information.
  61
  62 .. c:type:: struct video_command
  63
  64 .. code-block:: c
  65
  66         /* The structure must be zeroed before use by the application
  67         This ensures it can be extended safely in the future. */
  68         struct video_command {
  69                 __u32 cmd;
  70                 __u32 flags;
  71                 union {
  72                         struct {
  73                                 __u64 pts;
  74                         } stop;
  75
  76                         struct {
  77                                 /* 0 or 1000 specifies normal speed,
  78                                 1 specifies forward single stepping,
  79                                 -1 specifies backward single stepping,
  80                                 >1: playback at speed/1000 of the normal speed,
  81                                 <-1: reverse playback at (-speed/1000) of the normal speed. */
  82                                 __s32 speed;
  83                                 __u32 format;
  84                         } play;
  85
  86                         struct {
  87                                 __u32 data[16];
  88                         } raw;
  89                 };
  90         };
  91
  92
  93 Return Value
  94 ------------
  95
  96 On success 0 is returned, on error -1 and the ``errno`` variable is set
  97 appropriately. The generic error codes are described at the
  98 :ref:`Generic Error Codes <gen-errors>` chapter.