Take a look at this repository: https://github.com/VinamraVij/react-native-audio-wave-recording. I've implemented a method for recording audio with a waveform display and added animations that sync with the waveform and audio during recording. You may need to adjust the pitch values to improve the waveform visualization, as the pitch settings vary between Android and iOS.

Checkout video https://www.youtube.com/watch?v=P3E_8gZ27MU

I've just bump with this post, I am building a React Native Waveform visualiser, still work in progres with the android side, but its working on the iOS side.

Pretty much is a port from WaveForm on IOS ,using Igor Shubin's solution.

You are very welcome to check out the code at https://github.com/juananime/react-native-audiowaveform

1. To try straight away:

   npm react-native-audiowaveform --save
   

Cheers!

The solution is very easy, there is a library called hark which can help you to listen to audio streams and emit events (speaking / not speaking)

Here is the library link with NPM: https://www.npmjs.com/package/hark

Example:

import hark from 'hark';

var speech = hark(stream, options); // stream is the sound coming from user's mic
speech.on('speaking', function() {
   setSpeaking(true);
});

speechEvents.on('stopped_speaking', function() {
  setSpeaking(false);
});