FreeBSD Webcam:传送门

1 查看摄像头USB驱动

CMD

ls /dev/v*

Result

/dev/vcs /dev/vcs4 /dev/vcsa1 /dev/vcsa5 /dev/vhost-net

/dev/vcs1 /dev/vcs5 /dev/vcsa2 /dev/vcsa6 /dev/vhost-vsock

/dev/vcs2 /dev/vcs6 /dev/vcsa3 /dev/vga_arbiter /dev/video0

/dev/vcs3 /dev/vcsa /dev/vcsa4 /dev/vhci

/dev/v4l:

by-id by-path

/dev/vfio:

vfio

Analysis

输入命令后,出现的结果里含有/dev/video0说明USB摄像头驱动安装成功,Ubuntu18.0以自动安装了USB摄像头驱动.

/dev/video0

2 查看USB信息

2.1 摄像头ID

CMD

lsusb

Result

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

Bus 001 Device 003: ID 0ac8:3420 Z-Star Microelectronics Corp. Venus USB2.0 Camera

Bus 001 Device 002: ID 17ef:6019 Lenovo

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Analysis

由第二行信息Device 003:ID 3240可知摄像头ID为3240.

2.2 查看设备名称

CMD

cd /dev

dmesg | grep video

Result

[ 22.137377] Linux video capture interface: v2.00

[ 27.358749] uvcvideo: Found UVC 1.00 device A4tech USB2.0 Camera (0ac8:3420)

[ 27.360265] uvcvideo 1-5:1.0: Entity type for entity Processing 2 was not initialized!

[ 27.360267] uvcvideo 1-5:1.0: Entity type for entity Camera 1 was not initialized!

[ 27.360268] uvcvideo 1-5:1.0: Entity type for entity Extension 4 was not initialized!

[ 27.360442] usbcore: registered new interface driver uvcvideo

Analysis

第二行信息Found UVC,可知摄像头使用UVC协议.

2.3 查看摄像头协议

cd /dev

sudo cat /sys/kernel/debug/usb/devices

Result

T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh=12

B: Alloc= 0/800 us ( 0%), #Int= 0, #Iso= 0

D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS=64 #Cfgs= 1

P: Vendor=1d6b ProdID=0002 Rev= 4.15

S: Manufacturer=Linux 4.15.0-43-generic xhci-hcd

S: Product=xHCI Host Controller

S: SerialNumber=0000:00:14.0

C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA

I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub

E: Ad=81(I) Atr=03(Int.) MxPS= 4 Ivl=256ms

T: Bus=01 Lev=01 Prnt=01 Port=03 Cnt=01 Dev#= 2 Spd=1.5 MxCh= 0

D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1

P: Vendor=17ef ProdID=6019 Rev= 1.00

S: Manufacturer=PixArt

S: Product=Lenovo USB Optical Mouse

C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=100mA

I:* If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=02 Driver=usbhid

E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=10ms

T: Bus=01 Lev=01 Prnt=01 Port=04 Cnt=02 Dev#= 3 Spd=480 MxCh= 0

D: Ver= 2.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS=64 #Cfgs= 1

P: Vendor=0ac8 ProdID=3420 Rev= 1.fa

S: Manufacturer=Vimicro Corp.

S: Product=A4tech USB2.0 Camera

C:* #Ifs= 4 Cfg#= 1 Atr=80 MxPwr=320mA

A: FirstIf#= 0 IfCount= 2 Cls=0e(video) Sub=03 Prot=00

A: FirstIf#= 2 IfCount= 2 Cls=01(audio) Sub=02 Prot=00

I:* If#= 0 Alt= 0 #EPs= 1 Cls=0e(video) Sub=01 Prot=00 Driver=uvcvideo

E: Ad=81(I) Atr=03(Int.) MxPS= 10 Ivl=2ms

I:* If#= 1 Alt= 0 #EPs= 0 Cls=0e(video) Sub=02 Prot=00 Driver=uvcvideo

I: If#= 1 Alt= 1 #EPs= 1 Cls=0e(video) Sub=02 Prot=00 Driver=uvcvideo

E: Ad=82(I) Atr=05(Isoc) MxPS= 128 Ivl=125us

I: If#= 1 Alt= 2 #EPs= 1 Cls=0e(video) Sub=02 Prot=00 Driver=uvcvideo

E: Ad=82(I) Atr=05(Isoc) MxPS= 512 Ivl=125us

I: If#= 1 Alt= 3 #EPs= 1 Cls=0e(video) Sub=02 Prot=00 Driver=uvcvideo

E: Ad=82(I) Atr=05(Isoc) MxPS=1024 Ivl=125us

I: If#= 1 Alt= 4 #EPs= 1 Cls=0e(video) Sub=02 Prot=00 Driver=uvcvideo

E: Ad=82(I) Atr=05(Isoc) MxPS=1536 Ivl=125us

I: If#= 1 Alt= 5 #EPs= 1 Cls=0e(video) Sub=02 Prot=00 Driver=uvcvideo

E: Ad=82(I) Atr=05(Isoc) MxPS=2048 Ivl=125us

I: If#= 1 Alt= 6 #EPs= 1 Cls=0e(video) Sub=02 Prot=00 Driver=uvcvideo

E: Ad=82(I) Atr=05(Isoc) MxPS=2688 Ivl=125us

I: If#= 1 Alt= 7 #EPs= 1 Cls=0e(video) Sub=02 Prot=00 Driver=uvcvideo

E: Ad=82(I) Atr=05(Isoc) MxPS=3072 Ivl=125us

I:* If#= 2 Alt= 0 #EPs= 0 Cls=01(audio) Sub=01 Prot=00 Driver=snd-usb-audio

I:* If#= 3 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio

I: If#= 3 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio

E: Ad=83(I) Atr=01(Isoc) MxPS= 98 Ivl=1ms

T: Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=5000 MxCh= 6

B: Alloc= 0/800 us ( 0%), #Int= 0, #Iso= 0

D: Ver= 3.00 Cls=09(hub ) Sub=00 Prot=03 MxPS= 9 #Cfgs= 1

P: Vendor=1d6b ProdID=0003 Rev= 4.15

S: Manufacturer=Linux 4.15.0-43-generic xhci-hcd

S: Product=xHCI Host Controller

S: SerialNumber=0000:00:14.0

C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA

I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub

E: Ad=81(I) Atr=03(Int.) MxPS= 4 Ivl=256ms

Analysis

由信息P: Vendor=0ac8 ProdID=3420 Rev= 1.fa知此信息(ProdID=3240)为摄像头信息.

3 捕捉视频

3.1 camorama软件

安装

sudo apt-get install camorama

启动

camorama

camorama界面:

图3.1 Camorama视频捕捉软件

3.2 cheese视频捕捉软件

安装

sudo apt-get install cheese

启动

cheese

Cheese软件界面:

图3.2 Cheese视频捕捉软件

# 4 总结

- Ubuntu使用USB摄像头,需安装USB驱动;

- 注意查看摄像头使用的协议;