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Video for Linux Two API Specification

Revision 0.24

Michael H Schimek

󴖦󴖦󴖦󴖦󴖦󴖦󴖦󴖦󴖦󴖦󴖦󴖦

<mschimek@gmx.at>

󴖦󴖦󴖦󴖦󴖦󴖦󴖦󴖦󴖦󴖦

Bill Dirks

Hans Verkuil

Martin Rubli

1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Bill

Dirks, Michael H. Schimek, Hans Verkuil, Martin Rubli

This document is copyrighted

1999-2008 by Bill Dirks, Michael H. Schimek, Hans

Verkuil and Martin Rubli.

Permission is granted to copy, distribute and/or modify this document under the

terms of the GNU Free Documentation License, Version 1.1 or any later version

published by the Free Software Foundation; with no Invariant Sections, with no

Front-Cover Texts, and with no Back-Cover Texts. A copy of the license is

included in the appendix entitled "GNU Free Documentation License".

Programming examples can be used and distributed without restrictions.

Table of Contents

Introduction

1. Common API Elements

1.1. Opening and Closing Devices

1.1.1. Device Naming

1.1.2. Related Devices

1.1.3. Multiple Opens

1.1.4. Shared Data Streams

1.1.5. Functions

1.2. Querying Capabilities

1.3. Application Priority

1.4. Video Inputs and Outputs

1.5. Audio Inputs and Outputs

1.6. Tuners and Modulators

1.6.1. Tuners

1.6.2. Modulators

1.6.3. Radio Frequency

1.6.4. Satellite Receivers

1.7. Video Standards

1.8. User Controls

页码，1/263Video for Linux Two API Specification

2009-10-31http://v4l2spec.bytesex.org/spec-single/v4l2.html

1.9. Extended Controls

1.9.1. Introduction

1.9.2. The Extended Control API

1.9.3. Enumerating Extended Controls

1.9.4. Creating Control Panels

1.9.5. MPEG Control Reference

1.9.6. Camera Control Reference

1.10. Data Formats

1.10.1. Data Format Negotiation

1.10.2. Image Format Enumeration

1.11. Image Cropping, Insertion and Scaling

1.11.1. Cropping Structures

1.11.2. Scaling Adjustments

1.11.3. Examples

1.12. Streaming Parameters

2. Image Formats

2.1. Standard Image Formats

2.2. Colorspaces

2.3. Indexed Format

2.4. RGB Formats

Packed RGB formats󴖦--󴖦Packed RGB formats

V4L2_PIX_FMT_SBGGR8 ('BA81')󴖦--󴖦Bayer RGB format

V4L2_PIX_FMT_SBGGR16 ('BA82')󴖦--󴖦Bayer RGB format

2.5. YUV Formats

Packed YUV formats󴖦--󴖦Packed YUV formats

V4L2_PIX_FMT_GREY ('GREY')󴖦--󴖦Grey-scale image

V4L2_PIX_FMT_Y16 ('Y16 ')󴖦--󴖦Grey-scale image

V4L2_PIX_FMT_YUYV ('YUYV')󴖦--󴖦Packed format with

horizontal chroma

resolution, also known as YUV 4:2:2

V4L2_PIX_FMT_UYVY ('UYVY')󴖦--󴖦Variation of

V4L2_PIX_FMT_YUYV

with

different order of samples in memory

V4L2_PIX_FMT_Y41P ('Y41P')󴖦--󴖦Format with

horizontal chroma

resolution, also known as YUV 4:1:1

V4L2_PIX_FMT_YVU420 ('YV12'), V4L2_PIX_FMT_YUV420 ('YU12')󴖦--󴖦Planar

formats with

horizontal and vertical chroma resolution, also known

as YUV 4:2:0

V4L2_PIX_FMT_YVU410 ('YVU9'), V4L2_PIX_FMT_YUV410 ('YUV9')󴖦--󴖦Planar

formats with

horizontal and vertical chroma resolution, also known

as YUV 4:1:0

V4L2_PIX_FMT_YUV422P ('422P')󴖦--󴖦Format with

horizontal chroma

resolution, also known as YUV 4:2:2. Planar layout as opposed to

V4L2_PIX_FMT_YUYV

V4L2_PIX_FMT_YUV411P ('411P')󴖦--󴖦Format with

horizontal chroma

resolution, also known as YUV 4:1:1. Planar layout as opposed to

V4L2_PIX_FMT_Y41P

V4L2_PIX_FMT_NV12 ('NV12'), V4L2_PIX_FMT_NV21 ('NV21')󴖦--󴖦Formats with

horizontal and vertical chroma resolution, also known as YUV 4:2:0.

One luminance and one chrominance plane with alternating chroma samples

as opposed to

V4L2_PIX_FMT_YVU420

2.6. Compressed Formats

2.7. Reserved Format Identifiers

3. Input/Output

3.1. Read/Write

页码，2/263Video for Linux Two API Specification

2009-10-31http://v4l2spec.bytesex.org/spec-single/v4l2.html

ioctl VIDIOC_ENCODER_CMD, VIDIOC_TRY_ENCODER_CMD󴖦--󴖦Execute an encoder

command

ioctl VIDIOC_ENUMAUDIO󴖦--󴖦Enumerate audio inputs

ioctl VIDIOC_ENUMAUDOUT󴖦--󴖦Enumerate audio outputs

ioctl VIDIOC_ENUM_FMT󴖦--󴖦Enumerate image formats

ioctl VIDIOC_ENUM_FRAMESIZES󴖦--󴖦Enumerate frame sizes

ioctl VIDIOC_ENUM_FRAMEINTERVALS󴖦--󴖦Enumerate frame intervals

ioctl VIDIOC_ENUMINPUT󴖦--󴖦Enumerate video inputs

ioctl VIDIOC_ENUMOUTPUT󴖦--󴖦Enumerate video outputs

ioctl VIDIOC_ENUMSTD󴖦--󴖦Enumerate supported video standards

ioctl VIDIOC_G_AUDIO, VIDIOC_S_AUDIO󴖦--󴖦Query or select the current audio

input and its attributes

ioctl VIDIOC_G_AUDOUT, VIDIOC_S_AUDOUT󴖦--󴖦Query or select the current audio

output

ioctl VIDIOC_G_CHIP_IDENT󴖦--󴖦Identify the chips on a TV card

ioctl VIDIOC_G_CROP,

VIDIOC_S_CROP󴖦--󴖦Get or set the current cropping

rectangle

ioctl VIDIOC_G_CTRL,

VIDIOC_S_CTRL󴖦--󴖦Get or set the value of a control

ioctl VIDIOC_G_ENC_INDEX󴖦--󴖦Get meta data about a compressed video stream

ioctl VIDIOC_G_EXT_CTRLS, VIDIOC_S_EXT_CTRLS, VIDIOC_TRY_EXT_CTRLS󴖦-- Get or

set the value of several controls, try control values

ioctl VIDIOC_G_FBUF, VIDIOC_S_FBUF󴖦--󴖦Get or set frame buffer overlay

parameters

ioctl VIDIOC_G_FMT, VIDIOC_S_FMT, VIDIOC_TRY_FMT󴖦--󴖦Get or set the data

format, try a format

ioctl VIDIOC_G_FREQUENCY, VIDIOC_S_FREQUENCY󴖦--󴖦Get or set tuner or

modulator radio frequency

ioctl VIDIOC_G_INPUT, VIDIOC_S_INPUT󴖦--󴖦Query or select the current video

input

ioctl VIDIOC_G_JPEGCOMP, VIDIOC_S_JPEGCOMP󴖦--󴖦

ioctl VIDIOC_G_MODULATOR, VIDIOC_S_MODULATOR󴖦--󴖦Get or set modulator

attributes

ioctl VIDIOC_G_OUTPUT,

VIDIOC_S_OUTPUT󴖦--󴖦Query or select the current video

output

ioctl VIDIOC_G_PARM,

VIDIOC_S_PARM󴖦--󴖦Get or set streaming parameters

ioctl VIDIOC_G_PRIORITY,

VIDIOC_S_PRIORITY󴖦--󴖦Query or request the access

priority associated with a file descriptor

ioctl

VIDIOC_G_SLICED_VBI_CAP󴖦--󴖦Query sliced VBI capabilities

ioctl VIDIOC_G_STD, VIDIOC_S_STD󴖦--󴖦Query or select the video standard of

the current input

ioctl VIDIOC_G_TUNER, VIDIOC_S_TUNER󴖦--󴖦Get or set tuner attributes

ioctl VIDIOC_LOG_STATUS󴖦--󴖦Log driver status information

ioctl VIDIOC_OVERLAY󴖦--󴖦Start or stop video overlay

ioctl VIDIOC_QBUF, VIDIOC_DQBUF󴖦--󴖦Exchange a buffer with the driver

ioctl VIDIOC_QUERYBUF󴖦--󴖦Query the status of a buffer

ioctl VIDIOC_QUERYCAP󴖦--󴖦Query device capabilities

ioctl VIDIOC_QUERYCTRL, VIDIOC_QUERYMENU󴖦--󴖦Enumerate controls and menu

control items

ioctl VIDIOC_QUERYSTD󴖦--󴖦Sense the video standard received by the current

input

ioctl VIDIOC_REQBUFS󴖦--󴖦Initiate Memory Mapping or User Pointer I/O

ioctl VIDIOC_STREAMON, VIDIOC_STREAMOFF󴖦--󴖦Start or stop streaming I/O

V4L2 mmap()󴖦--󴖦Map device memory into application address space

页码，4/263Video for Linux Two API Specification

2009-10-31http://v4l2spec.bytesex.org/spec-single/v4l2.html

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