// requirements
const fs = require('fs');
const metadata = require('musicmetadata');

// extract metadata for further processing
exports.extractMetadata = function extractMetadata(sourceFile, callback) {
    const stream = fs.createReadStream(sourceFile);
    metadata(stream, function (err, metadata) {
        if (err) {
            return callback(err);
        }
        stream.close();
        callback(null, sourceFile, metadata)
    });
};