streaming speech to text api recognition requests nodejs

1const recorder = require('node-record-lpcm16');
2
3// Imports the Google Cloud client library
4const speech = require('@google-cloud/speech');
5
6// Creates a client
7const client = new speech.SpeechClient();
8
9/**
10 * TODO(developer): Uncomment the following lines before running the sample.
11 */
12// const encoding = 'Encoding of the audio file, e.g. LINEAR16';
13// const sampleRateHertz = 16000;
14// const languageCode = 'BCP-47 language code, e.g. en-US';
15
16const request = {
17  config: {
18    encoding: encoding,
19    sampleRateHertz: sampleRateHertz,
20    languageCode: languageCode,
21  },
22  interimResults: false, // If you want interim results, set this to true
23};
24
25// Create a recognize stream
26const recognizeStream = client
27  .streamingRecognize(request)
28  .on('error', console.error)
29  .on('data', data =>
30    process.stdout.write(
31      data.results[0] && data.results[0].alternatives[0]
32        ? `Transcription: ${data.results[0].alternatives[0].transcript}\n`
33        : '\n\nReached transcription time limit, press Ctrl+C\n'
34    )
35  );
36
37// Start recording and send the microphone input to the Speech API.
38// Ensure SoX is installed, see https://www.npmjs.com/package/node-record-lpcm16#dependencies
39recorder
40  .record({
41    sampleRateHertz: sampleRateHertz,
42    threshold: 0,
43    // Other options, see https://www.npmjs.com/package/node-record-lpcm16#options
44    verbose: false,
45    recordProgram: 'rec', // Try also "arecord" or "sox"
46    silence: '10.0',
47  })
48  .stream()
49  .on('error', console.error)
50  .pipe(recognizeStream);
51
52console.log('Listening, press Ctrl+C to stop.');