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camera.js
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camera.js
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'use strict';
// Dependencies: Built-in
const cp = require('child_process');
const Stream = require('stream');
// Dependencies: Third Party
const got = require('got');
const ip = require('ip');
const MjpegConsumer = require('tessel-mjpeg-consumer');
// Dependencies: Internal
const CaptureStream = require('./capture-stream');
const priv = new WeakMap();
const isValidVideoDevice = device => {
return device && /\/dev\/video\d/.test(device);
};
const isValidRemoteStream = url => {
return url && url.endsWith('?action=stream');
};
const videoUrl = port => {
return `http://${ip.address()}:${port}/?action=stream`;
};
try {
cp.spawnSync('kill -9 $(pgrep "mjpg_streamer")');
} catch (error) {}
class Camera extends Stream {
constructor(options) {
super();
let device = '/dev/video0';
let dimensions = '800x600';
let fps = 30;
let port = 8080;
let quality = 100;
let timeout = 10000;
let url = ''; // use ip.address()
let state = {
frame: null,
mjpg: null,
process: null,
remote: null,
stream: null,
};
/* istanbul ignore else */
if (typeof options === 'undefined') {
options = {};
}
if (typeof options === 'string') {
url = options;
options = {};
}
// -r
if (options.dimensions) {
dimensions = options.dimensions;
} else {
if (options.width && options.height) {
dimensions = `${options.width}x${options.height}`;
}
}
// -q
if (options.fps) {
fps = options.fps;
}
// -q
if (options.quality) {
quality = options.quality;
}
// XXXX
if (options.port) {
port = options.port;
}
// /dev/video0|1
if (isValidVideoDevice(options.device)) {
device = options.device;
}
// No string url provided
/* istanbul ignore else */
if (!url) {
if (options.url && isValidRemoteStream(options.url)) {
url = options.url;
} else {
url = videoUrl(port);
}
}
if (options.timeout) {
timeout = options.timeout;
}
state.mjpg = {
fps,
device,
dimensions,
quality,
port,
};
state.remote = {
url,
timeout,
start() {
state.process = cp.spawn('mjpg_streamer', [
'-i',
`/usr/lib/input_uvc.so -n -q ${quality} -r ${dimensions} -f ${fps} -d ${device} `,
'-o',
`/usr/lib/output_http.so -p ${port}`,
]);
},
stop() {
/* istanbul ignore else */
if (state.process) {
state.process.kill('SIGTERM');
state.process = null;
}
}
};
priv.set(this, state);
Object.defineProperties(this, {
dimensions: {
get() {
return dimensions;
}
},
frame: {
get() {
return state.frame;
}
},
url: {
get() {
return url;
}
}
});
// state.process.stdout.on("data", (buffer) => {
// console.log(buffer.toString());
// });
// state.process.stderr.on("data", (buffer) => {
// console.log(buffer.toString());
// });
this.highWaterMark = 0;
this.readable = true;
this.writable = true;
this.stream();
}
stream() {
let state = priv.get(this);
if (!state.process) {
state.remote.start();
}
if (!state.stream) {
state.stream = got.stream(state.remote.url);
state.stream.on('error', () => {
state.stream = null;
this.stream();
});
let incoming = state.stream.pipe(new MjpegConsumer());
incoming.on('data', frame => state.frame = frame);
incoming.on('error', () => {
state.stream = null;
this.stream();
});
incoming.pipe(this);
}
return this;
}
capture() {
let cs = new CaptureStream(this);
this.stream();
this.once('data', data => {
cs.push(data);
cs.push(null);
cs.on('end', () => this.stop());
});
return cs;
}
stop() {
priv.get(this).remote.stop();
this.emit('stop');
return this;
}
// start() {
// priv.get(this).remote.start();
// return this;
// }
write(chunk) {
/* istanbul ignore else */
if (chunk) {
this.emit('data', chunk);
this.emit('frame', chunk);
}
}
}
module.exports = Camera;