利用VF2部署一個網絡攝像頭

本來今天想下載編譯openWRT，后來發現tf卡空間分配問題，明天再調整吧，看了看桌上的USB攝像頭，今天晚上就你出場了。

一開始我是猶豫的，因為RISC-V的生態，不一定能部署的上相關軟件，但是JH7110，加上Imagination的GPU，再加上Debian OS，想不出會有什么不兼容的場景，最大風險可能來自CPU，有的話應該都能解決掉，那就上吧。

一、軟件環境

（一）操作系統

官方的Debian鏡像（starfive-jh7110-202306-SD-minimal-desktop.img），也沒用去update了，反正也挺新的。

root@starfive:# uname -a
Linux starfive 5.15.0-starfive #1 SMP Sun Jun 11 07:48:39 UTC 2023 riscv64 GNU/Linux

就是因為文件名上帶minimal，可能需要安裝的東西會比較多，反正我心里有個數。

（二）安裝libjpeg62-turbo-dev

root@starfive:# apt install libjpeg62-turbo-dev
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following additional packages will be installed:
  libc-dev-bin libc-devtools libc6-dev libcrypt-dev libnsl-dev libtirpc-dev
  linux-libc-dev manpages manpages-dev rpcsvc-proto
Suggested packages:
  glibc-doc
The following NEW packages will be installed:
  libc-dev-bin libc-devtools libc6-dev libcrypt-dev libjpeg62-turbo-dev
  libnsl-dev libtirpc-dev linux-libc-dev manpages manpages-dev rpcsvc-proto
0 upgraded, 11 newly installed, 0 to remove and 0 not upgraded.
Need to get 8933 kB of archives.
After this operation, 44.8 MB of additional disk space will be used.
Do you want to continue? [Y/n] y

（三）安裝imagemagick

root@starfive:#  apt install imagemagick
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following additional packages will be installed:
  imagemagick-6.q16 libnetpbm11 netpbm
Suggested packages:
  imagemagick-doc autotrace cups-bsd | lpr | lprng curl enscript ffmpeg gimp
  gnuplot grads graphviz hp2xx html2ps libwmf-bin mplayer povray radiance
  texlive-base-bin transfig ufraw-batch xdg-utils
  imagemagick imagemagick-6.q16 libnetpbm11 netpbm
0 upgraded, 4 newly installed, 0 to remove and 0 not upgraded.
After this operation, 7693 kB of additional disk space will be used.

（四）安裝libv4l-dev

root@starfive:# apt install libv4l-dev
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following additional packages will be installed:
  libv4l2rds0
Suggested packages:
  pkg-config
The following NEW packages will be installed:
  libv4l-dev libv4l2rds0
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 291 kB of archives.
After this operation, 1948 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 https://snapshot.debian.org/archive/debian-ports/20221225T084846Z unstable/main riscv64 libv4l2rds0 riscv64 1.22.1-5+b1 [80.4 kB]
Get:2 https://snapshot.debian.org/archive/debian-ports/20221225T084846Z unstable/main riscv64 libv4l-dev riscv64 1.22.1-5+b1 [211 kB]
Fetched 291 kB in 5s (61.7 kB/s)

（五）安裝編譯工具

發現gcc、git、cmake啥都沒用，果然夠minimal，逐一apt install。

root@starfive: # apt install gcc
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following additional packages will be installed:
  gcc-12 libasan8 libcc1-0 libgcc-12-dev
Suggested packages:
  gcc-multilib make autoconf automake libtool flex bison gdb gcc-doc
  gcc-12-doc gcc-12-locales
The following NEW packages will be installed:
  gcc gcc-12 libasan8 libcc1-0 libgcc-12-dev
0 upgraded, 5 newly installed, 0 to remove and 0 not upgraded.
Need to get 18.6 MB of archives.
After this operation, 70.0 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 https://snapshot.debian.org/archive/debian-ports/20221225T084846Z unstable/main riscv64 libcc1-0 riscv64 12.2.0-10 [38.4 kB]
Get:2 https://snapshot.debian.org/archive/debian-ports/20221225T084846Z unstable/main riscv64 libasan8 riscv64 12.2.0-10 [2067 kB]
Get:3 https://snapshot.debian.org/archive/debian-ports/20221225T084846Z unstable/main riscv64 libgcc-12-dev riscv64 12.2.0-10 [1951 kB]
Get:4 https://snapshot.debian.org/archive/debian-ports/20221225T084846Z unstable/main riscv64 gcc-12 riscv64 12.2.0-10 [14.6 MB]
Get:5 https://snapshot.debian.org/archive/debian-ports/20221225T084846Z unstable/main riscv64 gcc riscv64 4:12.2.0-1 [5200 B]
Fetched 18.6 MB in 3min 55s (79.5 kB/s)

安裝完成后檢查下：

root@starfive:# gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/riscv64-linux-gnu/12/lto-wrapper
Target: riscv64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 12.2.0-10' --with-bugurl=file:///usr/share/doc/gcc-12/README.Bugs --enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-12 --program-prefix=riscv64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-libitm --disable-libquadmath --disable-libquadmath-support --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --disable-werror --disable-multilib --with-arch=rv64gc --with-abi=lp64d --enable-checking=release --build=riscv64-linux-gnu --host=riscv64-linux-gnu --target=riscv64-linux-gnu
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.2.0 (Debian 12.2.0-10)

二、源碼下載、編譯和安裝

（一）源碼下載

JH7110處理能力毋庸置疑，直接板子上編譯和安裝，源代碼直接從github上拉取。

git clone https://github.com/jacksonliam/mjpg-streamer.git
Cloning into 'mjpg-streamer'...
remote: Enumerating objects: 2964, done.
remote: Total 2964 (delta 0), reused 0 (delta 0), pack-reused 2964
Receiving objects: 100% (2964/2964), 3.48 MiB | 4.33 MiB/s, done.
Resolving deltas: 100% (1885/1885), done.

（二）源碼編譯和安裝

進入/mjpg-streamer/mjpg-streamer-experimental 文件夾，執行 make all。

檢查下生成的文件，

再安裝。

三、服務啟動

（一）前期工作

首先確保網絡正常連接。

之后插入USB camera，OS提示已經識別：

root@starfive: # [ 3976.150090] usb 1-1.3: new high-speed USB device number 3 using xhci_hcd
[ 3976.295340] usb 1-1.3: Found UVC 1.00 device HIK 720P Camera (2bdf:0280)
[ 3976.306997] input: HIK 720P Camera: HIK 720P Camer as /devices/platform/soc/2b000000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1                                                                     .3/1-1.3:1.0/input/input0

通過對比video大法判斷設備名，找出是/dev/video4：

root@starfive: # ls -l /dev/video*
crw-rw----+ 1 root video 81, 0 Dec 22  2022 /dev/video0
crw-rw----+ 1 root video 81, 1 Dec 22  2022 /dev/video1
crw-rw----+ 1 root video 81, 2 Dec 22  2022 /dev/video2
crw-rw----+ 1 root video 81, 3 Dec 22  2022 /dev/video3
crw-rw----+ 1 root video 81, 6 Aug 21 14:42 /dev/video4
crw-rw----+ 1 root video 81, 7 Aug 21 14:42 /dev/video5
crw-rw----+ 1 root video 81, 4 Dec 22  2022 /dev/video6
crw-rw----+ 1 root video 81, 5 Dec 22  2022 /dev/video7

(二)啟動USB攝像頭

直接輸入 mjpg_streamer 即可啟動服務，默認的是video0，VF2開發板的USB攝像頭是video4。在啟動服務命令中通過“-d /dev/video4” 選項來指定。

y是表示YUV格式。如果沒有-y，默認啟動是mjpeg格式
-d指定設備
-f 制訂幀數，默認30幀
-r指定視頻大小，如320×240
-q指定畫質，默認80對于輸出參數：
-p 指定端口，一般是8080
-w 指定網頁目錄，設置的是/www目錄
-c設置通過密碼訪問

./mjpg_streamer -i "./input_uvc.so -d /dev/video4 -f 30 -q 90 -n" -o "./output_http.so -w ./www"

啟動后的日志如下：

四、網絡攝像頭測試

（一）在線視頻查看

打開瀏覽器，訪問URL為：[VF2開發板 IP]:8080 ，得到的內容如下：

（二）取一張圖

取一張圖的URL為`IP:8080?action=snapshot，直接給自己照相：

五、一些體會

全程下來無錯誤，整個軟件安裝非常順利，本以為會出現的各種小問題一個都沒。
JH7110 CPU功能強大，之前在H616上也編譯過mjpg-streamer，耗時跟VF2完全不同，在VF2上簡直飛一般編譯安裝。
GPU（Imagination BXE-4-32 GPU）還沒有測試，按理來說Imagination的應該兼容性和性能不會有什么大問題，下次有時間可以測試下。

審核編輯：湯梓紅