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audio.js
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audio.js
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'use strict';
const child_process = require('child_process');
const crypto = require('crypto');
const fs = require('fs');
const https = require('https');
const TaskRoot = process.env.LAMBDA_TASK_ROOT;
exports.download = function (url, extension) {
return new Promise((resolve, reject) => {
let tmpFileName = randomFileName(extension);
let outfile = fs.createWriteStream(tmpFileName);
https.get(url, function (response) {
response.pipe(outfile);
outfile.on('finish', () => outfile.close(() => resolve(tmpFileName)));
}).on('error', function (err) {
fs.unlink(tmpFileName);
reject(err);
});
});
};
exports.transcode = function (file) {
return new Promise((resolve, reject) => {
let tmpFileName = randomFileName('wav');
let result = child_process.spawnSync(`${TaskRoot}/bin/ffmpeg`, [
'-i', file, '-ar', '8000', '-ac', '1', tmpFileName
]);
if (result.error || result.status !== 0) {
console.error(result.error);
console.error(result.status);
console.error(result.stdout.toString());
console.error(result.stderr.toString());
reject(result.error ? result.error : 'Unable to download file');
} else {
console.log(result.status);
console.log(result.stdout.toString());
console.log(result.stderr.toString());
console.log(`Transcoded to ${tmpFileName}`);
resolve(tmpFileName);
}
});
};
function randomFileName(extension) {
return '/tmp/' + crypto.randomBytes(16).toString('hex') + `.${extension}`;
}