7.1.2.15. VIDEO_COMMAND

7.1.2.15.1. Name

VIDEO_COMMAND

Attention

This ioctl is deprecated.

7.1.2.15.2. Synopsis

int ioctl(int fd, VIDEO_COMMAND, struct video_command *cmd)

7.1.2.15.3. 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.

7.1.2.15.4. 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This ioctl is obsolete.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 For V4L2 decoders this ioctl has been replaced by the ioctl VIDIOC_DECODER_CMD, VIDIOC_TRY_DECODER_CMD ioctl.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;
        };
};

7.1.2.15.5. 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.