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const { spawn } = require('child_process');
const FIFO = require('fifo-js');
const http = require('http');
class TrackPlayer {
constructor(file) {
this.file = file;
this.volume = 0;
this.storedVolume = this.volume;
}
loadProcess() {
this.fifo = new FIFO();
this.process = spawn('mpv', [
'--no-video',
'--loop',
'--volume=' + this.volume,
'--input-file=' + this.fifo.path,
this.file,
]);
this.process.stderr.pipe(process.stderr);
}
sendCommand(command) {
if (this.fifo) {
this.fifo.write(command);
}
}
seekToStart() {
this.sendCommand('seek 0 absolute');
}
pause() {
this.sendCommand('set pause yes');
}
play() {
this.sendCommand('set pause no');
}
setVolume(volume) {
if (Math.floor(volume) !== this.storedVolume) {
this.storedVolume = Math.floor(volume);
this.sendCommand(`set volume ${volume}`);
}
this.volume = volume;
}
}
const tracks = {
mantis: new TrackPlayer('track1.wav'),
bass: new TrackPlayer('track2.wav'),
main: new TrackPlayer('track3.wav')
};
for (const track of Object.values(tracks)) {
track.loadProcess();
track.pause();
}
setTimeout(() => {
for (const track of Object.values(tracks)) {
track.seekToStart();
track.play();
}
let targetMode = [
{track: 'main', volume: 100}
];
setInterval(() => {
if (!Array.isArray(targetMode)) {
console.log('targetMode is not an array.');
targetMode = [];
}
for (const [key, track] of Object.entries(tracks)) {
const mode = targetMode.find(m => m.track === key) || {volume: 0};
track.setVolume(track.volume + 0.1 * (mode.volume - track.volume));
}
}, 100);
const server = http.createServer((request, response) => {
response.setHeader('Access-Control-Allow-Origin', '*');
response.setHeader('Access-Control-Allow-Headers', 'Authorization, Cache-Control, Access-Control-Allow-Headers, Origin,Accept, X-Requested-With, Content-Type, Access-Control-Request-Method, Access-Control-Request-Headers');
console.log('Got request.');
if (request.method === 'GET') {
response.write('Please use POST.');
response.end();
} else if (request.method === 'POST') {
let allData = '';
request.on('data', data => {
allData += data;
});
request.on('end', () => {
try {
targetMode = JSON.parse(allData);
response.write('Set.');
} catch (error) {
response.write('Invalid JSON.');
}
response.end();
});
} else {
response.end();
}
});
server.listen(8000);
}, 250);
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