ioctl VIDIOC_ENUM_DV_TIMINGS
Prev | Appendix A. Function Reference | Next

## Name

VIDIOC_ENUM_DV_TIMINGS — Enumerate supported Digital Video timings

## Synopsis

`int ioctl(` | int fd,
| int request,
| struct v4l2_enum_dv_timings *argp`)`;

## Arguments

`fd`

  File descriptor returned by `open()`.

`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 struct 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 error code 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.

Table A.23. struct v4l2_enum_dv_timings

__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.
struct v4l2_dv_timings | `timings` | The timings.

## 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.

EINVAL

  The struct v4l2_enum_dv_timings `index` is out of bounds.

ENODATA

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

Prev | Up | Next
ioctl VIDIOC_ENUMAUDOUT | Home | ioctl VIDIOC_ENUM_FMT