An open-source lightweight Equestrian lossless (if possible) audio codec
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#!/usr/bin/env node
global.fs = require('fs');
global.os = require('os');
global.path = require('path');
global.zlib = require('zlib');
global.child_process = require('child_process');
global.version = "1.1";
global.argv = process.argv;
argv.shift(); argv.shift();
console.log("Equestria Lossless Audio Codec");
console.log(" (c) Copyright, Equestria.dev");
console.log("ELAC Decoder");
console.log(" (c) Copyright, Equestria.dev");
console.log("version " + version);
console.log("");
try {
child_process.execSync("ffmpeg -version");
child_process.execSync("ffprobe -version");
child_process.execSync("ffplay -version");
} catch (e) {
console.error("Unable to start the ELAC Decoder:\n ffmpeg was not found or is incomplete");
process.exit(2);
}
if (argv.length < 1) {
console.error("Unable to start the ELAC Decoder:\n No input file has been specified");
process.exit(2);
}
global.inputFile = argv[0].trim();
global.file = path.basename(inputFile);
if (!fs.existsSync(inputFile)) {
console.error("Unable to decode \"" + file + "\":\n \"" + inputFile + "\": no such file or directory");
process.exit(2);
}
console.log("Reading Equestria Lossless Audio Codec data...");
try {
global.data = JSON.parse(zlib.inflateSync(fs.readFileSync(inputFile), {
level: -1,
strategy: 0,
memLevel: 9
}).toString());
} catch (e) {
console.error("Unable to decode \"" + file + "\":\n \"" + inputFile + "\": unable to decode file");
process.exit(2);
}
if (!data._eqmc) {
console.error("Unable to decode \"" + file + "\":\n \"" + inputFile + "\": not a valid ELAC file");
process.exit(2);
}
global.inputs = data.files;
for (let input of inputs) {
console.log("\n" + input._id + ":\n " + Object.keys(input.tags).map(i => { return i + ": " + input.tags[i]; }).join("\n ") + "\n");
try {
if (fs.existsSync(os.tmpdir() + "/elac-play-temp")) {
fs.rmSync(os.tmpdir() + "/elac-play-temp", { recursive: true });
}
fs.mkdirSync(os.tmpdir() + "/elac-play-temp", { recursive: true });
} catch (e) {
console.error("Unable to decode \"" + file + "\":\n Cannot create temporary working directory");
process.exit(2);
}
console.log("Decoding \"" + inputFile + ":/" + input._id + "\"...");
let outFile = os.tmpdir() + "/elac-play-temp/" + input._id + ".mp3";
if (input.lossless) {
outFile = os.tmpdir() + "/elac-play-temp/" + input._id + ".flac";
}
fs.writeFileSync(outFile, zlib.inflateSync(Buffer.from(input.data, "base64"), {
level: -1,
strategy: 0,
memLevel: 9
}));
console.log("Moving to \"" + inputFile + "." + input._id + ".wav\"...");
child_process.execFileSync("ffmpeg", [ "-v", "quiet", "-i", outFile, "-map_metadata", "-1", "-fflags", "+bitexact", "-flags:v", "+bitexact", "-flags:a", "+bitexact", "-metadata", "id3v2_priv.XMP=", outFile + ".wav" ]);
fs.renameSync(outFile + ".wav", inputFile + "." + input._id + ".wav");
try {
fs.rmSync(os.tmpdir() + "/elac-play-temp", { recursive: true });
} catch (e) {
console.error("Unable to encode \"" + file + "\":\n Cannot clear temporary working directory");
process.exit(2);
}
}
console.log("Done!");