Development: Discussion of Video4Linux API Enhancements

This page gathers ideas, suggestions, and drafts for V4L API enhancements. Discussion can take place on the V4L mailing list.

Ideas

• [Your idea here]

Drafts

VIDIOC_ENUM_FRAME_FORMATS

Topic

Draft for a new ioctl that allows frame format enumeration

Reason for enhancement

The V4L2 API lacks a way for applications to enumerate frame rates and other frame format related information. Enumerating supported frame rates, formats, and resolutions is required for webcam applications. (See discussion on video4linux-list: Thread: Frame rate enumeration ioctl)

Date/Author

2006-05-31, Martin Rubli

Mailing list

RFC: ioctl for frame format enumeration

Download draft

HTML, Text only/Wiki

Status

replaced by VIDIOC_ENUM_FRAMESIZES and VIDIOC_ENUM_FRAMEINTERVALS

VIDIOC_ENUM_FRAMESIZES, VIDIOC_ENUM_FRAMEINTERVALS

Topic

Draft for two new ioctls that allow frame size and frame interval enumeration

Reason for enhancement

The V4L2 API lacks a way for applications to enumerate frame rates and other frame format related information. Enumerating supported frame rates, formats, and resolutions is required for webcam applications. (See discussion on video4linux-list: Thread: Frame rate enumeration ioctl)

Date/Author

2006-07-06, Martin Rubli

Mailing list

RFC: ioctls for frame format enumeration (2nd version)

Download draft

• VIDIOC_ENUM_FRAMESIZES: HTML Text
• VIDIOC_ENUM_FRAMEINTERVALS: HTML Text

Status

Implemented by the Linux UVC driver, to be submitted to V4L2

Usage sample

frmfmtenum.c