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Commit 27a709ea authored by Neil Gershenfeld's avatar Neil Gershenfeld
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add prior node version

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<pre>
shopcam server, prior node version
to clone: git clone https://gitlab.cba.mit.edu/pub/cams.git
to reinitialize: ./init
to run: node cams.js
uses ffmpeg for screen capture
uses convert to make thumbnails
uses compare to measure activity
can use uvcdynctrl -f to list resolutions
can use sudo guvcview to adjust camera
can use http-server-with-auth to serve:
http-server-with-auth -p port --username username --password password
http-server-with-auth -p port --username username --password password --ssl --cert cert.pem --key key.pem
index is at http://this_address:this_port
last image is at http://this_address:this_port/oldimage.jpg
can use Ubuntu MATE on Raspberry Pi 3:
sudo apt-get install nodejs-legacy npm ffmpeg imagemagick guvcview
sudo npm install -g http-server-with-auth
System -> Administration -> Time and Date -> Keep synchronized with internet servers
can use Logitech C920 HD Webcam
can start cams script on boot with cams.service:
edit cams script with port, username, and password
sudo cp cams.service /lib/systemd/system
sudo systemctl daemon-reload
sudo systemctl enable cams.service
sudo systemctl start cams.service
journalctl -u cams.service
node/cams 0 → 100755
View file @ 27a709ea
#!/bin/bash
cd /home/fab/cams
node cams.js &
http-server-with-auth -p set_port_number --username set_username --password set_password &
node/cams.js 0 → 100644
View file @ 27a709ea
//
// cams.js
// shopcam activity monitor
// Neil Gershenfeld
// 12/11/17
//
// settings
//
var image_width = 1600
var image_height = 1200
var thumbnail_size = 200
var video_filter = 'vflip,hflip'
var difference_threshold = .05
var millisecond_image_delay = 15000
var days_to_save = 150
//
// requires
//
const fs = require('fs')
const exec = require('child_process').exec
const execSync = require('child_process').execSync
//
// image update function
//
function update() {
//
// name image with time
//
var date = new Date()
var year = date.getFullYear()
var month = ('0'+(1+parseInt(date.getMonth()))).slice(-2)
var day = ('0'+date.getDate()).slice(-2)
var hour = ('0'+date.getHours()).slice(-2)
var minute = ('0'+date.getMinutes()).slice(-2)
var second = ('0'+date.getSeconds()).slice(-2)
var name = year+'-'+month+'-'+day+'-'+hour+'-'+minute+'-'+second+'.jpg'
//
// take new image
//
console.log('\ncapture '+name)
var success = true
do {
try {
execSync('ffmpeg -y -f v4l2 -s '+image_width+'x'+image_height+' -i /dev/video0 -vframes 1 -vf '+video_filter+' image.jpg')
}
catch(err) {
success = false
}
}
while (success != true)
//
// remove prior images
//
date.setDate(date.getDate()-days_to_save)
var oldyear = date.getFullYear()
var oldmonth = ('0'+(1+parseInt(date.getMonth()))).slice(-2)
var oldday = ('0'+date.getDate()).slice(-2)
var oldhour = ('0'+date.getHours()).slice(-2)
var oldminute = ('0'+date.getMinutes()).slice(-2)
var prefix = oldyear+'-'+oldmonth+'-'+oldday+'-'+oldhour+'-'+oldminute+'*'
console.log('remove '+prefix)
execSync('rm -f images/'+prefix+'*')
execSync('rm -f thumbnails/'+prefix+'*')
//
// check if image has changed beyond threshold
//
try {
execSync('compare -metric RMSE image.jpg oldimage.jpg null: 2>&1')
}
catch(err) {
var ret = String(err.stdout).split(' ')
var ptrl = ret[1].indexOf('(')
var ptrr = ret[1].indexOf(')')
var diff = parseFloat(ret[1].slice(ptrl+1,ptrr))
console.log('image difference: '+diff)
}
if (diff > difference_threshold) {
//
// size has changed, keep image
//
console.log('activity detected, save image')
execSync('convert image.jpg -resize '+thumbnail_size+'x'+thumbnail_size+' thumbnails/'+name)
execSync('cp image.jpg images/'+name)
//
// rebuild day's index
//
console.log('reindex day')
execSync("echo '<html><body>' > index/newindex.html")
execSync("echo '<script src=../display.js></script>' > index/newindex.html")
execSync('ls images | awk \'/^'+year+'-'+month+'-'+day+'/ { print "<img src=\\"../thumbnails/" $1 "\\" id=\\"" $1 "\\" style=\\"width:20%;height:auto;cursor:pointer;\\" onmousedown=display(\\"" $1 "\\")>" }\' >> index/newindex.html')
execSync("mv index/newindex.html index/"+month+"-"+day+".html")
//
// delay before next image
//
console.log('delay before next image')
execSync('mv image.jpg oldimage.jpg')
setTimeout(update,millisecond_image_delay)
}
else {
//
// size hasn't changed
//
console.log('no activity detected, don\'t save image')
//
// no delay before next image
//
execSync('mv image.jpg oldimage.jpg')
setTimeout(update,0)
}
}
//
// take initial image
//
var success = true
do {
try {
execSync('ffmpeg -y -f v4l2 -s '+image_width+'x'+image_height+' -i /dev/video0 -vframes 1 -vf '+video_filter+' oldimage.jpg')
}
catch(err) {
success = false
}
}
while (success != true)
//
// start update
//
update()
node/cams.service 0 → 100644
View file @ 27a709ea
[Unit]
Description=cams
After=network.target
[Service]
Type=forking
ExecStart=/bin/bash /home/fab/cams/cams
[Install]
WantedBy=multi-user.target
node/display.js 0 → 100644
View file @ 27a709ea
var lastid
function display(id) {
var img = document.getElementById(lastid)
if (img != null) {
img.src = "../thumbnails/"+id
img.style.width = "20%"
}
var img = document.getElementById(id)
img.src = "../images/"+id
img.style.width = "100%"
lastid = id
}
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