ラズパイ4デジカメ計画③〜Nodejsでlibcameraを使ったカメラ機能を実装する

            $ sudo raspi-config

        

            $ vcgencmd get_camera
supported=0 detected=0, libcamera interfaces=0

        

            $ sudo nano /boot/config.txt

        

            #...省略

dtoverlay=ov5647

#...

        

            $ ls /dev/ | grep video
video0
#...

        

            $ vcgencmd get_camera
supported=1 detected=0, libcamera interfaces=1

        

            $ libcamera-hello
Preview window unavailable
[0:00:49.368615839] [1674]  INFO Camera camera_manager.cpp:297 libcamera v0.0.5+83-bde9b04f
[0:00:49.427213820] [1675]  INFO RPI vc4.cpp:437 Registered camera /base/soc/i2c0mux/i2c@1/ov5647@36 to Unicam device /dev/media4 and ISP device /dev/media0
[0:00:49.427555432] [1675]  INFO RPI pipeline_base.cpp:1101 Using configuration file '/usr/share/libcamera/pipeline/rpi/vc4/rpi_apps.yaml'
[0:00:49.429376080] [1674]  INFO Camera camera.cpp:1033 configuring streams: (0) 1296x972-YUV420
[0:00:49.429980469] [1675]  INFO RPI vc4.cpp:565 Sensor: /base/soc/i2c0mux/i2c@1/ov5647@36 - Selected sensor format: 1296x972-SGBRG10_1X10 - Selected unicam format: 1296x972-pGAA
#0 (0.00 fps) exp 33222.00 ag 8.00 dg 1.00
#...
#140 (30.02 fps) exp 33222.00 ag 8.00 dg 1.00
#141 (30.02 fps) exp 33222.00 ag 8.00 dg 1.00

        

            $ libcamera-jpeg -n -o test.jpg
[0:01:00.920428999] [1681]  INFO Camera camera_manager.cpp:297 libcamera v0.0.5+83-bde9b04f
[0:01:00.966632314] [1682]  INFO RPI vc4.cpp:437 Registered camera /base/soc/i2c0mux/i2c@1/ov5647@36 to Unicam device /dev/media4 and ISP device /dev/media0
[0:01:00.966773925] [1682]  INFO RPI pipeline_base.cpp:1101 Using configuration file '/usr/share/libcamera/pipeline/rpi/vc4/rpi_apps.yaml'
[0:01:00.968313777] [1681]  INFO Camera camera.cpp:1033 configuring streams: (0) 1296x972-YUV420
[0:01:00.968866702] [1682]  INFO RPI vc4.cpp:565 Sensor: /base/soc/i2c0mux/i2c@1/ov5647@36 - Selected sensor format: 1296x972-SGBRG10_1X10 - Selected unicam format: 1296x972-pGAA
[0:01:06.120863607] [1681]  INFO Camera camera.cpp:1033 configuring streams: (0) 2592x1944-YUV420 (1) 2592x1944-SGBRG10_CSI2P
[0:01:06.125998310] [1682]  INFO RPI vc4.cpp:565 Sensor: /base/soc/i2c0mux/i2c@1/ov5647@36 - Selected sensor format: 2592x1944-SGBRG10_1X10 - Selected unicam format: 2592x1944-pGAA
Still capture image received

        

            $ tree
.
├── main.js
├── src
│   ├── camera_ctrl.js
│   └── switch_ctrl.js
└── package.json

        

            $ nano package.json

        

            {
    "name": "rpi-legacy-camera-app",
    "version": "0.0.1",
    "description": "RPi legacy camera app for armhf",
    "main": "main.js",
    "private": true,
    "dependencies": {
        "pigpio": "^3.3.1"
    }
}

        

            $ yarn install

        

            $ nano main.js

        

            const fs = require('node:fs');
const path = require('node:path');
const sw = require('./src/switch_ctrl');

//👇Ctrl&Cキーでプロセスを終了させる場合
process.on('SIGINT', () => {
    process.exit(0);
});

const sleep = (_ms) => {
    return new Promise(resolve => { setTimeout(() => resolve(), _ms)});
}

(async () => {
    //👇静止画の保存先としてtmpフォルダを作成
    const _dir = path.resolve(__dirname, 'tmp');
    if (!fs.existsSync(_dir)) {
        console.log('tmpフォルダを作成します。');
        fs.mkdirSync(_dir);
    }
    console.log(`An app is getting started!`);
    while(true) {
        //👇シャッタースイッチが押されたかを確認
        await sw.push();
        //👇100msほど時間間隔を空ける
        await sleep(100);
    }
})();

        

            $ nano src/switch_ctrl.js

        

            const { execSync } = require('node:child_process');
const camera = require('./camera_ctrl');

const Gpio = require('pigpio').Gpio;
//👇38番ピン(GPIO20)をシャッタースイッチに設定
const button = new Gpio(20, {
    mode: Gpio.INPUT,
    pullUpDown: Gpio.PUD_UP,
});

const sleep = (_ms) => {
    return new Promise(resolve => { setTimeout(() => resolve(), _ms)});
}

const callShutdown = async () => {
    execSync(`/sbin/shutdown -h now 'Turn off by GPIO'`);
};

const push = async () => {
    const _start = Date.now();
    //👇ボタンが押された状態(0)が開始する
    if (button.digitalRead() === 0) {
        console.log("Button has been pushed!");
        while(true) {
            //👇ボタンが離された状態(1)に戻るまで待機
            if (button.digitalRead() === 1) {
                break;
            }
            await sleep(50);
        }
        //👇ボタンが押されてから離されるまでの時間[ms]を取得
        const _end = Date.now() - _start;
        if (_end > 5000) {
            //👇ボタンが5秒長押しで電源オフ
            console.log("SHUTDONW signal detected! Bye-bye!!");
            await callShutdown();
        }
        else if (_end < 50) {
            //まれに入力シグナルのノイズ電圧を誤検出する際の対策
            return;
        }
        else {
            //👇ボタン押し5秒未満ならカメラ撮影処理を開始
            console.log(`Let me take a picture!`);
            await camera.shutter();
        }
    }
    return;
};

exports.push = push;

        

            $ nano src/camera_ctrl.js

        

            const { execSync } = require('node:child_process');
const path = require('node:path');

let shutter_numb = 0;

const sleep = (_ms) => {
    return new Promise(resolve => { setTimeout(() => resolve(), _ms)});
}

const shutter = async () => {
    shutter_numb += 1;

    //👇保存先はtmpフォルダを指定
    const pwd = path.resolve(__dirname, '../tmp');

    const output = `${pwd}/${shutter_numb}-${(new Date()).toISOString()}.jpg`;
    const disp = 'DISPLAY=:0.0';
    const width = 640;
    const height = 480;
    const timeout = 2000
    const cmd = `libcamera-jpeg -o ${output} -f -t ${timeout} --width ${width} --height ${height}`;

    await execSync(`${disp} ${cmd}`);
    console.log('A picture has been saved.');
};

exports.shutter = shutter;

        

            $ sudo $(which node) main.js

        

            $ nano start-camera-app.sh

        

            #!/bin/bash

export DISPLAY=:0.0

WORK_DIR=/home/user/camera-worker
MY_NODE=/home/user/.nvm/versions/node/v16.20.2/bin/node

sudo $MY_NODE $WORK_DIR/main.js

        

            $ sudo chmod +x start-camera-app.sh 

        

            $ sudo nano /usr/share/applications/node-camera-app.desktop

        

            [Desktop Entry]
Name=node-camera-app
Type=Application
Version=1.0
Comment=libcamera app hosted by nodejs
Exec=/home/user/camera-worker/start-camera-app.sh
Terminal=true
Categories=Utility;

        

            $ sudo nano /etc/systemd/system/camera.service

        

            [Unit]
Description=Camera Launcher
After=multi-user.target

[Service]
User=user
Environment=DISPLAY=:0.0
Environment=XAUTHORITY=/home/user/.Xauthority
ExecStart=lxterminal -e /home/user/camera-worker/start-camera-app.sh
Restart=always

[Install]
WantedBy=multi-user.target

        

            $ sudo systemctl daemon-reload

        

            $ sudo systemctl start camera.service
$ sudo systemctl status camera.service
● camera.service - Camera Launcher
     Loaded: loaded (/etc/systemd/system/camera.service; enabled; vendor preset: enabled)
     Active: active (running) since Thu 2024-02-15 15:02:03 JST; 25min ago
   Main PID: 768 (lxterminal)
      Tasks: 14 (limit: 1539)
        CPU: 1min 49.635s
     CGroup: /system.slice/camera.service
             ├─ 768 lxterminal -e /home/user/camera-worker/start-camera-app.sh
             ├─1311 /bin/bash /home/user/camera-worker/start-camera-app.sh
             ├─1317 sudo /home/user/.nvm/versions/node/v16.20.2/bin/node /home/user/camera-worker/main.js
             └─1324 /home/user/.nvm/versions/node/v16.20.2/bin/node /home/user/camera-worker/main.js

Feb 15 15:02:03 raspberrypi systemd[1]: Started Camera Launcher.
Feb 15 15:02:05 raspberrypi lxterminal[768]: error: XDG_RUNTIME_DIR not set in the environment.
Feb 15 15:02:09 raspberrypi sudo[1317]: user : TTY=pts/0 ; PWD=/ ; USER=root ; COMMAND=/home/user/.nvm/versions/node/v16.2>
Feb 15 15:02:09 raspberrypi sudo[1317]: pam_unix(sudo:session): session opened for user root(uid=0) by (uid=1000)

        

            $ sudo systemctl stop camera.service

        

            $ sudo systemctl enable camera.service

        

            #!/bin/bash

echo '======= APP DOWNLOADER FROM RPI TO LOCAL MACHINE ======='

source .env
###☆.envファイルの例:
#TARGET_SSH_CLIENT=user
#TARGET_SSH_CIP=192.168.1.10
#WORKER_DIR=camera-worker

echo "TARGET_SSH_CLIENT=$TARGET_SSH_CLIENT"
echo "TARGET_SSH_CIP=$TARGET_SSH_CIP"
echo "WORKER_DIR=$WORKER_DIR"

rsync -avP --delete \
    --include="*.jp*g" \
    --include="*.png" \
    --exclude="*.*" \
    --exclude="node_modules/" \
    --exclude="src/" \
    -e ssh $TARGET_SSH_CLIENT@$TARGET_SSH_CIP:/home/$TARGET_SSH_CLIENT/$WORKER_DIR/tmp/ ./tmp

        

            $ systemd-analyze time
Startup finished in 3.706s (kernel) + 14.376s (userspace) = 18.082s
graphical.target reached after 14.277s in userspace

        

            $ systemd-analyze blame
7.972s hciuart.service
7.304s rc-local.service
2.117s e2scrub_reap.service
2.090s dev-mmcblk0p2.device
1.744s raspi-config.service
1.704s rpi-eeprom-update.service
1.501s udisks2.service
1.233s systemd-logind.service
1.157s dhcpcd.service
1.110s ModemManager.service
#...
  12ms plymouth-quit-wait.service

        

            $ sudo systemctl disable bluetooth.service
$ sudo systemctl disable hciuart.service

        

            $ systemd-analyze time
Startup finished in 4.109s (kernel) + 14.586s (userspace) = 18.696s
graphical.target reached after 14.497s in userspace