6.2.2.15. VIDEO_COMMAND¶
6.2.2.15.2. Synopsis¶
-
int
ioctl
(int fd, VIDEO_COMMAND, struct video_command *cmd)¶
6.2.2.15.3. Arguments¶
int fd | File descriptor returned by a previous call to open(). |
int request | Equals VIDEO_COMMAND for this command. |
struct video_command *cmd | Commands the decoder. |
6.2.2.15.4. Description¶
This ioctl is obsolete. Do not use in new drivers. For V4L2 decoders this ioctl has been replaced by the ioctl VIDIOC_DECODER_CMD, VIDIOC_TRY_DECODER_CMD ioctl.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
ioctl VIDIOC_DECODER_CMD, VIDIOC_TRY_DECODER_CMD documentation for
more information.
-
struct
video_command
¶
/* 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;
};
};
6.2.2.15.5. 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
Generic Error Codes chapter.