ioctl VIDIOC_ENUM_DV_TIMINGS, VIDIOC_SUBDEV_ENUM_DV_TIMINGS

&manvol;

VIDIOC_ENUM_DV_TIMINGS

VIDIOC_SUBDEV_ENUM_DV_TIMINGS

Enumerate supported Digital Video timings

    	int ioctl
    	int fd
    	int request
    	struct v4l2_enum_dv_timings *argp

## Arguments

`fd`

- &fd;

`request`

- VIDIOC_ENUM_DV_TIMINGS, VIDIOC_SUBDEV_ENUM_DV_TIMINGS

`argp`

## Description

### Experimental

This is an experimental interface and may change in the future.

While some DV receivers or transmitters support a wide range of timings, others support only a limited number of timings. With this ioctl applications can enumerate a list of known supported timings. Call &VIDIOC-DV-TIMINGS-CAP; to check if it also supports other standards or even custom timings that are not in this list.

To query the available timings, applications initialize the index field and zero the reserved array of &v4l2-enum-dv-timings; and call the `VIDIOC_ENUM_DV_TIMINGS` ioctl on a video node with a pointer to this structure. Drivers fill the rest of the structure or return an &EINVAL; when the index is out of bounds. To enumerate all supported DV timings, applications shall begin at index zero, incrementing by one until the driver returns EINVAL. Note that drivers may enumerate a different set of DV timings after switching the video input or output.

When implemented by the driver DV timings of subdevices can be queried by calling the `VIDIOC_SUBDEV_ENUM_DV_TIMINGS` ioctl directly on a subdevice node. The DV timings are specific to inputs (for DV receivers) or outputs (for DV transmitters), applications must specify the desired pad number in the &v4l2-enum-dv-timings; pad field. Attempts to enumerate timings on a pad that doesn't support them will return an &EINVAL;.

## struct v4l2_enum_dv_timings

&cs-str;
__u32 | index | Number of the DV timings, set by the application.
__u32 | pad | Pad number as reported by the media controller API. This field is only used when operating on a subdevice node. When operating on a video node applications must set this field to zero.
__u32 | reserved[2] | Reserved for future extensions. Drivers and applications must set the array to zero.
&v4l2-dv-timings; | timings | The timings.

&return-value;

EINVAL

- The &v4l2-enum-dv-timings; index is out of bounds or the pad number is invalid.

ENODATA

- Digital video presets are not supported for this input or output.