How to use microphone-stream - 4 common examples

function convertAudioToBinaryMessage(audioChunk) {
    let raw = mic.toRaw(audioChunk);

    if (raw == null)
        return;

    // downsample and convert the raw audio bytes to PCM
    let downsampledBuffer = audioUtils.downsampleBuffer(raw, sampleRate);
    let pcmEncodedBuffer = audioUtils.pcmEncode(downsampledBuffer);

    // add the right JSON headers and structure to the message
    let audioEventMessage = getAudioEventMessage(Buffer.from(pcmEncodedBuffer));

    //convert the JSON object + headers into a binary event stream message
    let binary = eventStreamMarshaller.marshall(audioEventMessage);

    return binary;
}

startMic.on('data', (chunk) => {
          var raw = mic.toRaw(chunk);
          if (raw == null) {
            return;
          }

        buffer = buffer.concat(...raw)
        this.setState({audioBuffer: buffer})
      });

getUserMedia({ audio: true }, (err, userMedia) => {
    if (err) {
      onUserMediaError(err)
    } else {
      theUserMedia = userMedia
      var micStream = new MicrophoneStream(userMedia, { objectMode: true, bufferSize: 1024 })
      micStream.on('data', data => {
        onData(Buffer.from(data.getChannelData(0).buffer))
      })
    }
  })
}

window.navigator.mediaDevices.getUserMedia({ video: false, audio: true }).then((stream) => {
        const startMic = new mic();

        startMic.setStream(stream);

        startMic.on('data', (chunk) => {
          var raw = mic.toRaw(chunk);
          if (raw == null) {
            return;
          }

        buffer = buffer.concat(...raw)
        this.setState({audioBuffer: buffer})
      });

      this.setState({recording: true})
      this.setState({micStream: startMic})
    })