【BIGTREETECH PI开发板】+04.UVC（USB摄像头）测试（zmj）

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【BIGTREETECH PI开发板】+04.UVC（USB摄像头）测试（zmj） [复制链接]

 

【BIGTREETECH PI开发板】+04.UVC（USB摄像头）测试（zmj）

BIGTREETECH PI开发板没有预留MIPI-CSI接口，但是它支持常见的USB摄像头（UVC），因此本节主要测试内容围绕USB-Camera展开。

//------UVC / USB-Camera
UVC通俗的讲就是USB摄像头，全称为USB Video Class，即：USB视频类，是一种为USB视频捕获设备定义的协议标准。

1. 摄像头接口设备

摄像头设备位于” /dev/video*“。一般情况下， /dev/video0为USB摄像头。

//------查看摄像头设备节点
a.通过设备列表查看
ls -la /dev/video*
b.通过v4l2-ctl工具查看
v4l2-ctl --list-devices
c.通过media0检查有效摄像头节点
media-ctl -d /dev/media0 -p

//------示例Log信息
biqu@BTT-CB1:~/zmj_ws/gui_gpu$ v4l2-ctl --list-devices
USB 2.0 Camera: USB Camera (usb-5101000.usb-1.1):
        /dev/video0
        /dev/video1
        /dev/media0

biqu@BTT-CB1:~/zmj_ws/gui_gpu$ ^C
biqu@BTT-CB1:~/zmj_ws/gui_gpu$ ^C
biqu@BTT-CB1:~/zmj_ws/gui_gpu$ ^C
biqu@BTT-CB1:~/zmj_ws/gui_gpu$ ls -la /dev/video*
crw-rw---- 1 root video 81, 0 Aug  6 10:02 /dev/video0
crw-rw---- 1 root video 81, 1 Aug  6 10:02 /dev/video1
biqu@BTT-CB1:~/zmj_ws/gui_gpu$ v4l2-ctl --list-devices
USB 2.0 Camera: USB Camera (usb-5101000.usb-1.1):
        /dev/video0
        /dev/video1
        /dev/media0

biqu@BTT-CB1:~/zmj_ws/gui_gpu$ media-ctl -d /dev/media0 -p
Media controller API version 5.16.17

Media device information
------------------------
driver          uvcvideo
model           USB 2.0 Camera: USB Camera
serial
bus info        usb-5101000.usb-1.1
hw revision     0x0
driver version  5.16.17

Device topology
- entity 1: USB 2.0 Camera: USB Camera (1 pad, 1 link)
            type Node subtype V4L flags 1
            device node name /dev/video0
        pad0: Sink
                <- "Extension 3":1 [ENABLED,IMMUTABLE]

- entity 4: USB 2.0 Camera: USB Camera (0 pad, 0 link)
            type Node subtype V4L flags 0
            device node name /dev/video1

- entity 8: Extension 3 (2 pads, 2 links)
            type V4L2 subdev subtype Unknown flags 0
        pad0: Sink
                <- "Processing 2":1 [ENABLED,IMMUTABLE]
        pad1: Source
                -> "USB 2.0 Camera: USB Camera":0 [ENABLED,IMMUTABLE]

- entity 11: Processing 2 (2 pads, 2 links)
             type V4L2 subdev subtype Unknown flags 0
        pad0: Sink
                <- "Camera 1":0 [ENABLED,IMMUTABLE]
        pad1: Source
                -> "Extension 3":0 [ENABLED,IMMUTABLE]

- entity 14: Camera 1 (1 pad, 1 link)
             type V4L2 subdev subtype Sensor flags 0
        pad0: Source
                -> "Processing 2":0 [ENABLED,IMMUTABLE]

biqu@BTT-CB1:~/zmj_ws/gui_gpu$

//------检查USB-Camera

 

2. USB摄像头测试

将USB摄像头插入开发板，将自动安装 uvc 添加设备节点。 注意：测试分辨率越高，视频效果越卡……

//------USB-Camera（某宝几十块买的USB摄像头）
a.确认USB摄像头的设备节点，此处为/dev/video0。
v4l2-ctl --list-devices
b.查看摄像头支持的格式与分辨率
v4l2-ctl --list-formats-ext -d /dev/video0
c.摄像头预览（视频）
gst-launch-1.0 v4l2src device=/dev/video0 ! "video/x-raw, width=640, Height=480, framerate=(fraction)30/1" ! queue ! glimagesink
或者
ffplay -f video4linux2 -framerate 30 -video_size hd720 /dev/video0
d.摄像头预览（拍照）
gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=3 ! jpegenc ! filesink location=~/pic_of_video0.jpg
e.USB-Camera设备信息（查看硬件变动信息即可）
dmesg | tail -11

//------测试Log信息（拍照）
biqu@BTT-CB1:~/zmj_ws/gui_gpu$ gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=3 ! jpegenc ! filesink location=~/pic_of_video0.jpg
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
Got EOS from element "pipeline0".
Execution ended after 0:00:02.205011637
Setting pipeline to NULL ...
Freeing pipeline ...
biqu@BTT-CB1:~/zmj_ws/gui_gpu$ ll ~
total 1172
drwxr-xr-x 10 biqu biqu    4096 Mar  3 11:39 crowsnest
drwxr-xr-x 11 biqu biqu    4096 Mar  3 11:27 klipper
drwxr-xr-x  9 biqu biqu    4096 Mar  3 11:40 KlipperScreen
drwxr-xr-x  5 biqu biqu    4096 Mar  3 09:25 klippy-env
drwxr-xr-x  5 biqu biqu    4096 Mar  3 11:39 mainsail
drwxr-xr-x  3 biqu biqu    4096 Mar  3 11:39 mainsail-config
drwxr-xr-x  8 biqu biqu    4096 Mar  3 09:26 moonraker
drwxr-xr-x  4 biqu biqu    4096 Mar  3 09:27 moonraker-env
drwxr-xr-x  8 biqu biqu    4096 Mar  3 11:40 moonraker-timelapse
-rw-r--r--  1 biqu biqu 1146415 Aug  6 10:13 pic_of_video0.jpg
drwxr-xr-x  3 biqu biqu    4096 Mar  3 11:40 print_area_bed_mesh
drwxr-xr-x 10 biqu biqu    4096 Mar  3 09:29 printer_data
drwxr-xr-x  8 biqu biqu    4096 Mar  3 11:40 sonar
drwxr-xr-x 17 biqu biqu    4096 Jul 23 12:47 zmj_ws
biqu@BTT-CB1:~/zmj_ws/gui_gpu$ eog ~/pic_of_video0.jpg

//------拍照功能测试：

 

//------视频功能测试：

uvc_video

 

//------end

tagetage

顶一下，楼主的USB 摄像头支持什么分辨率，多少fps，文中没有看到。最下面的视频是多少分辨率的，能到多少帧，是USB传输速度限制还是cpu处理能力限制了帧数呢？？？