.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
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.. c:namespace:: DTV.video
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.. _VIDEO_COMMAND:
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=============
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VIDEO_COMMAND
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=============
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Name
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----
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VIDEO_COMMAND
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.. attention:: This ioctl is deprecated.
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Synopsis
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--------
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.. c:macro:: VIDEO_COMMAND
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``int ioctl(int fd, VIDEO_COMMAND, struct video_command *cmd)``
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Arguments
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---------
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.. flat-table::
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:header-rows: 0
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:stub-columns: 0
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- .. row 1
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- int fd
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- File descriptor returned by a previous call to open().
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- .. row 2
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- int request
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- Equals VIDEO_COMMAND for this command.
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- .. row 3
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- struct video_command \*cmd
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- Commands the decoder.
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Description
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-----------
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This ioctl is obsolete. Do not use in new drivers. For V4L2 decoders
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this ioctl has been replaced by the
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:ref:`VIDIOC_DECODER_CMD` ioctl.
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This ioctl commands the decoder. The ``video_command`` struct is a
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subset of the ``v4l2_decoder_cmd`` struct, so refer to the
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:ref:`VIDIOC_DECODER_CMD` documentation for
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more information.
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.. c:type:: video_command
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.. code-block:: c
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/* The structure must be zeroed before use by the application
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This ensures it can be extended safely in the future. */
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struct video_command {
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__u32 cmd;
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__u32 flags;
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union {
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struct {
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__u64 pts;
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} stop;
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struct {
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/* 0 or 1000 specifies normal speed,
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1 specifies forward single stepping,
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-1 specifies backward single stepping,
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>1: playback at speed/1000 of the normal speed,
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<-1: reverse playback at (-speed/1000) of the normal speed. */
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__s32 speed;
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__u32 format;
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} play;
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struct {
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__u32 data[16];
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} raw;
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};
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};
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Return Value
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------------
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On success 0 is returned, on error -1 and the ``errno`` variable is set
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appropriately. The generic error codes are described at the
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:ref:`Generic Error Codes <gen-errors>` chapter.
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