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| 'use strict';
// Dependencies: Built-in
const cp = require('child_process');
const Emitter = require('events').EventEmitter;
// Dependencies: Internal
const CaptureStream = require('./capture-stream');
// Program specific
const priv = new WeakMap();
try {
cp.spawnSync('kill -9 $(pgrep "aplay")');
} catch (error) {}
try {
cp.spawnSync('kill -9 $(pgrep "arecord")');
} catch (error) {}
class Microphone extends Emitter {
constructor(options) {
super();
options = options || {};
const state = {
arecord: null,
aplay: null,
currentTime: 0,
isListening: false,
interval: null,
cs: new CaptureStream(),
time: null,
};
priv.set(this, state);
Object.defineProperties(this, {
currentTime: {
get: () => Number(state.currentTime.toFixed(3)),
},
isListening: {
get: () => state.isListening,
},
});
}
listen(options) {
const state = priv.get(this);
const time = 0;
let offset = null;
let args = [];
if (state.isListening) {
return state.cs;
}
options = options || {};
if (Array.isArray(options)) {
// mic.listen(['-f', 'cd', '-c', 1, '-r', 48000 ]);
args = options;
} else {
// Don't need to check for null, since those are handled above
/* istanbul ignore else */
if (typeof options === 'object') {
// mic.listen({
// ...
// });
//
args = Object.keys(options).reduce((accum, key) => {
const value = options[key];
let option = '';
/* istanbul ignore else */
if (key.length === 1) {
// mic.listen({
// c: 1,
// f: 'cd',
// });
//
option = '-';
}
// mic.listen({
// '-c': 1,
// '-f': 'cd',
// });
//
option += key;
accum.push(option, value);
return accum;
}, []);
}
}
if (args.length === 0) {
args = defaults.slice();
}
/* istanbul ignore else */
if (state.arecord === null) {
state.isListening = true;
state.currentTime = 0;
state.startTime = Date.now();
state.interval = setInterval(() => {
const now = Date.now();
if (offset === null) {
offset = now - state.startTime;
}
state.currentTime = time + (now - state.startTime - offset) / 1000;
this.emit('timeupdate', this.currentTime);
}, 100);
// Apply some reasonable defaults...
arecord.keys.forEach(key => {
if (!args.includes(key)) {
args.push(key, arecord.options[key]);
}
});
state.arecord = cp.spawn('arecord', args);
/* istanbul ignore if */
if (this.debug) {
state.arecord.stderr.on('data', data => {
const lines = data.toString().split('\n').filter(Boolean).map(line => line.trim());
console.error(lines.join('\n'));
});
}
state.arecord.stdout.on('data', data => {
state.cs.push(data);
this.emit('data', data);
this.emit('timeupdate', this.currentTime);
});
state.arecord.on('close', (code, signal) => {
Iif (code !== null && signal === null) {
if (state.interval) {
clearInterval(state.interval);
}
state.arecord = null;
state.currentTime = 0;
state.startTime = 0;
state.isListening = false;
this.emit('close');
}
});
this.emit('listen');
}
return state.cs;
}
monitor(catpureStream) {
const state = priv.get(this);
if (state.isListening) {
state.aplay = cp.spawn('aplay', ['-f', 'cd' /*, '-D', 'plughw:0,0' */ ]);
}
if (catpureStream) {
return catpureStream.pipe(state.aplay.stdin);
} else {
return state.cs.pipe(state.aplay.stdin);
}
}
stop() {
const state = priv.get(this);
if (!state.isListening) {
return this;
}
state.isListening = false;
if (state.interval) {
clearInterval(state.interval);
}
if (state.arecord) {
state.arecord.kill('SIGTERM');
state.arecord = null;
}
if (state.aplay) {
state.aplay.kill('SIGTERM');
state.aplay = null;
}
this.emit('stop');
return this;
}
}
const defaults = ['-f', 'cd', '-r', '48000' /*, '-D', 'plughw:0,0' */ ];
const arecord = {
options: {
// Disable until we can figure out how best to
// apply these without clumisly over-riding related flags
// '-f': 'cd',
// '-c': 1,
// '-r': 48000,
// '-D': 'plughw:0,0',
},
};
arecord.keys = Object.keys(arecord.options);
module.exports = Microphone;
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