1.. -*- coding: utf-8; mode: rst -*- 2 3.. _VIDEO_COMMAND: 4 5============= 6VIDEO_COMMAND 7============= 8 9Name 10---- 11 12VIDEO_COMMAND 13 14.. attention:: This ioctl is deprecated. 15 16Synopsis 17-------- 18 19.. c:function:: int ioctl(int fd, VIDEO_COMMAND, struct video_command *cmd) 20 :name: VIDEO_COMMAND 21 22 23Arguments 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3 44 45 - struct video_command \*cmd 46 47 - Commands the decoder. 48 49 50Description 51----------- 52 53This ioctl is obsolete. Do not use in new drivers. For V4L2 decoders 54this ioctl has been replaced by the 55:ref:`VIDIOC_DECODER_CMD` ioctl. 56 57This ioctl commands the decoder. The ``video_command`` struct is a 58subset of the ``v4l2_decoder_cmd`` struct, so refer to the 59:ref:`VIDIOC_DECODER_CMD` documentation for 60more 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 93Return Value 94------------ 95 96On success 0 is returned, on error -1 and the ``errno`` variable is set 97appropriately. The generic error codes are described at the 98:ref:`Generic Error Codes <gen-errors>` chapter. 99