| .. -*- coding: utf-8; mode: rst -*- |
| |
| .. _VIDEO_COMMAND: |
| |
| ============= |
| VIDEO_COMMAND |
| ============= |
| |
| Name |
| ---- |
| |
| VIDEO_COMMAND |
| |
| .. attention:: This ioctl is deprecated. |
| |
| Synopsis |
| -------- |
| |
| .. c:function:: int ioctl(int fd, VIDEO_COMMAND, struct video_command *cmd) |
| :name: VIDEO_COMMAND |
| |
| |
| 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_COMMAND for this command. |
| |
| - .. row 3 |
| |
| - struct video_command \*cmd |
| |
| - Commands the decoder. |
| |
| |
| Description |
| ----------- |
| |
| This ioctl is obsolete. Do not use in new drivers. For V4L2 decoders |
| this ioctl has been replaced by the |
| :ref:`VIDIOC_DECODER_CMD` ioctl. |
| |
| This ioctl commands the decoder. The ``video_command`` struct is a |
| subset of the ``v4l2_decoder_cmd`` struct, so refer to the |
| :ref:`VIDIOC_DECODER_CMD` documentation for |
| more information. |
| |
| .. c:type:: struct video_command |
| |
| .. code-block:: c |
| |
| /* The structure must be zeroed before use by the application |
| This ensures it can be extended safely in the future. */ |
| struct video_command { |
| __u32 cmd; |
| __u32 flags; |
| union { |
| struct { |
| __u64 pts; |
| } stop; |
| |
| struct { |
| /* 0 or 1000 specifies normal speed, |
| 1 specifies forward single stepping, |
| -1 specifies backward single stepping, |
| >1: playback at speed/1000 of the normal speed, |
| <-1: reverse playback at (-speed/1000) of the normal speed. */ |
| __s32 speed; |
| __u32 format; |
| } play; |
| |
| struct { |
| __u32 data[16]; |
| } raw; |
| }; |
| }; |
| |
| |
| 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. |