ioctl VIDIOC_ENUM_DV_TIMINGS
&manvol;

# VIDIOC_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

`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 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.

### struct v4l2_enum_dv_timings

&cs-str;
__u32 | index | Number of the DV timings, set by the application.
__u32 | reserved[3] | Reserved for future extensions. Drivers 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.