# 对接USB摄像头

开发者套件支持接入UVC协议的USB摄像头，本节介绍如何接入并测试USB摄像头。

1. 将USB摄像头接入开发者套件任意一个空闲USB接口（USB 3.0 Type-A）。
2. 以root用户登录开发者套件，执行命令，可以通过回显看到通过USB接口接入的摄像头。

```
lsusb
```


  回显如下：

```
Bus 005 Device 003: ID 0bda:9143 Realtek Semiconductor Corp. USB Camera
```


3. 开发者套件可自动检测USB摄像头接入并创建设备节点“/dev/video0”。用户可通过v4l2命令确认USB摄像头工作是否正常，执行以下命令。

```
sudo v4l2-ctl -d /dev/video0 --all
```


  系统回显如下，包含摄像机帧率、分辨率等信息：

```
Driver Info:
Driver name      : uvcvideo
Card type        : USB Camera: USB Camera
Bus info         : usb-a5100000.usb_2-1
Driver version   : 5.10.0
Capabilities     : 0x84a00001
Video Capture
Metadata Capture
Streaming
Extended Pix Format
Device Capabilities
Device Caps      : 0x04200001
Video Capture
Streaming
Extended Pix Format
Media Driver Info:
Driver name      : uvcvideo
Model            : USB Camera: USB Camera
Serial           : 200901010001
Bus info         : usb-a5100000.usb_2-1
Media version    : 5.10.0
Hardware revision: 0x00002021 (8225)
Driver version   : 5.10.0
Interface Info:
ID               : 0x03000002
Type             : V4L Video
Entity Info:
ID               : 0x00000001 (1)
Name             : USB Camera: USB Camera
Function         : V4L2 I/O
Flags            : default
Pad 0x01000007   : 0: Sink
Link 0x02000013: from remote pad 0x100000a of entity 'Realtek Extended Controls Unit' (Video Pixel Formatter): Data, Enabled, Immutable
Priority: 2
Video input : 0 (Camera 1: ok)
Format Video Capture:
Width/Height      : 1280/720
Pixel Format      : 'MJPG' (Motion-JPEG)
Field             : None
Bytes per Line    : 0
Size Image        : 1843200
Colorspace        : sRGB
Transfer Function : Rec. 709
YCbCr/HSV Encoding: ITU-R 601
Quantization      : Default (maps to Full Range)
Flags             :
Crop Capability Video Capture:
Bounds      : Left 0, Top 0, Width 1280, Height 720
Default     : Left 0, Top 0, Width 1280, Height 720
Pixel Aspect: 1/1
Selection Video Capture: crop_default, Left 0, Top 0, Width 1280, Height 720, Flags:
Selection Video Capture: crop_bounds, Left 0, Top 0, Width 1280, Height 720, Flags:
Streaming Parameters Video Capture:
Capabilities     : timeperframe
Frames per second: 30.000 (30/1)
Read buffers     : 0
```