v4l2中文手册(规范)全五章(包含驱动编写)pdf_v4l2.pdf中文手册

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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

注：

译：鱼在飞（Ch1~4）， fishOnFly@outlook.com

Tekkaman Ninja

审校：

目

录

Chapter 1. 通用 API（Common API Elements） ............................................................................................. 1

1.1. 打开和关闭设备（Opening and Closing Devices） ....................................................................... 1

1.1.1. 设备命名(Device Naming) .................................................................................................... 1

1.1.2. 相关设备(Related Devices) .................................................................................................. 2

1.1.3. 并发打开(Multiple Opens) ................................................................................................... 3

1.1.4. 共享数据流(Shared Data Streams) ...................................................................................... 3

1.1.5. 函数(Functions) .................................................................................................................... 3

1.2. 功能查询(Querying Capabilities) .................................................................................................... 3

1.3. 应用程序的优先级(Application Priority) ........................................................................................ 4

1.4. 视频输入/输出(Video Inputs and Outputs) .................................................................................... 4

1.5. 音频输入/输出(Audio Inputs and Outputs) .................................................................................... 5

1.6. 高频头和调制器（Tuners and Modulators） ................................................................................ 8

1.6.1. 高频头(Tuners) ..................................................................................................................... 8

1.6.2. 调制器（Modulators） ........................................................................................................ 9

1.6.3. 无线频率(Radio Frequency) ................................................................................................. 9

1.6.4. 卫星接收器(Satellite Receivers) ......................................................................................... 10

1.7. 视频标准(Video Standards) .......................................................................................................... 10

1.8. 用户控制(User Controls) ............................................................................................................... 14

1.9. 扩展控制(Extended Controls) ....................................................................................................... 20

1.9.1. 介绍(Introduction) .............................................................................................................. 20

1.9.2. 扩展类控制 API(The Extended Control API） ................................................................... 21

1.9.3. 扩展 control 值的枚举(Enumeration Extended Controls) ................................................. 21

1.9.4. 创建 control 面板(Creating Control Panels) ....................................................................... 22

1.9.5. MPEG Control Reference .................................................................................................... 22

1.9.6. 摄像头 control 参考(Camera Control Reference) .............................................................. 27

1.10. 数据格式(Data Formats) ............................................................................................................. 27

1.10.1. 协商数据格式(Data Format Negotiation) ........................................................................ 27

1.10.2. 枚举图片格式(Image Format Enumeration) ................................................................... 28

1.11. 图片修剪，插入和缩放(Image Cropping，Insertion and Scalling) ........................................... 28

1.11.1. 修剪结构(Cropping Structures) ........................................................................................ 29

1.11.2. 缩放调整(Scaling Adjustments) ....................................................................................... 30

1.11.3. 样例程序(Examples) ......................................................................................................... 30

1.12. Streaming 参数(Streaming Parameters) ...................................................................................... 34

Notes ........................................................................................................................................................ 34

Chapter 2. 图像格式(Image Formats) ............................................................................................................ 35

2.1. 标准图片格式(Standard Image Formats) ..................................................................................... 36

2.2. 色彩空间(Colorspaces) .................................................................................................................. 37

2.3. 索引格式(Indexed Format) ............................................................................................................ 40

2.4. RGB 格式(RGB Formats) ................................................................................................................ 40

2.5. YUV 格式(YUV Formats) ................................................................................................................ 43

2.6. 压缩格式(Compressed Formats) ................................................................................................... 44

2.7. 保留的格式标识符(Reserved Format Identifiers) ........................................................................ 45

Chapter 3. 输入/输出(Input/Output) ............................................................................................................. 46

3.1. 读和写(Read/Write) ...................................................................................................................... 46

3.2. 流式 I/O(内存映射缓冲区)(Streaming I/O(Memory Mapping)) .................................................. 47

3.3. 流 I/O(用户空间缓冲区(用户指针))(Streaming I/O(User Pointers)) ........................................... 50

3.4. 异步 I/O(Asynchronous I/O) .......................................................................................................... 52

3.5. 缓冲(Buffers) .................................................................................................................................. 52

3.5.1. 时码(Timecodes) ................................................................................................................ 55

3.6. field 次序(Field Order) ................................................................................................................... 55

Notes ........................................................................................................................................................ 56

Chapter 4. 接口(Interface) .............................................................................................................................. 57

4.1. 视频采集接口(Video Capture Interface) ........................................................................................ 57

4.1.1. 查询设备属性(Querying Capabilities) ................................................................................. 57

4.1.2. 附加功能(Supplemental Functions) ..................................................................................... 57

4.1.3. 图片格式协商(Image Format Negotiation) ......................................................................... 58

4.1.4. 读取图片(Reading Images) ................................................................................................... 58

4.2. Video Overlay Interface .................................................................................................................... 58

4.2.1. 查询设备属性(Querying Capabilities） ............................................................................... 59

4.2.2. 附加功能(Supplemental Functions) ..................................................................................... 59

4.2.3. 设置(Setup) ........................................................................................................................... 59

4.2.4．Overlay 窗口（Overlay Window） ..................................................................................... 59

4.2.5. 使能 overlay（Enabling Overlay）....................................................................................... 60

4.3. 视频输出接口(Video Output Interface) ......................................................................................... 61

4.3.1. 设备功能查询(Querying Capabilities) ................................................................................. 61

4.3.2. 附加功能（Supplemental Functions） ............................................................................... 61

4.3.3. 图片格式协商（Images Format Negotiation） .................................................................. 61

4.3.4. 写图片（Writing Image） .................................................................................................... 61

4.4. 视频输出 overlay 接口（Video Output Overlay Interface） ......................................................... 62

4.4.1. 设备功能查询（Querying Capabilities） ............................................................................ 62

4.4.2. 帧缓冲（Framebuffer） ...................................................................................................... 62

4.4.3. overlay 窗口和缩放 ............................................................................................................... 63

4.4.4. 使能 overlay（Enabling Overlay）....................................................................................... 63

4.5. 编码接口（Codec Interface） ........................................................................................................ 64

4.6. 特效设备接口（Effect Devices Interface） .................................................................................... 64

4.7. 原始 VBI 数据接口（Raw VBI Data Interface） ............................................................................. 64

4.8. 分离 VBI 数据接口（Sliced VBI Data Interface） .......................................................................... 64

4.9. 图文电视接口（Teltext Interface） ............................................................................................... 64

4.10. 无线电接口（Radio Interface） ................................................................................................... 65

4.11. 无线数据广播系统（Radio Data Interface） .............................................................................. 65

Notes ........................................................................................................................................................ 65

Chapter 5. 驱动编写 ....................................................................................................................................... 66

III