How to use the microsoft-cognitiveservices-speech-sdk.AudioInputStream function in microsoft-cognitiveservices-speech-sdk

  "use strict";
  
  // pull in the required packages.
  var sdk = require("microsoft-cognitiveservices-speech-sdk");
  var fs = require("fs");
  
  // replace with your own subscription key,
  // service region (e.g., "westus"), and
  // the name of the file you want to run
  // through the speech recognizer.
  var subscriptionKey = "YourSubscriptionKey";
  var serviceRegion = "YourServiceRegion"; // e.g., "westus"
  var filename = "YourAudioFile.wav"; // 16000 Hz, Mono
  
  // create the push stream we need for the speech sdk.
  var pushStream = sdk.AudioInputStream.createPushStream();
  
  // open the file and push it to the push stream.
  fs.createReadStream(filename).on('data', function(arrayBuffer) {
    pushStream.write(arrayBuffer.slice());
  }).on('end', function() {
    pushStream.close();
  });
  
  // we are done with the setup
  console.log("Now recognizing from: " + filename);
  
  // now create the audio-config pointing to our stream and
  // the speech config specifying the language.
  var audioConfig = sdk.AudioConfig.fromStreamInput(pushStream);
  var speechConfig = sdk.SpeechConfig.fromSubscription(subscriptionKey, serviceRegion);

function openPushStream(filename) {
        // create the push stream we need for the speech sdk.
        var pushStream = sdk.AudioInputStream.createPushStream();
    
        // open the file and push it to the push stream.
        fs.createReadStream(filename).on('data', function(arrayBuffer) {
            pushStream.write(arrayBuffer.slice());
        }).on('end', function() {
            pushStream.close();
        });
    
        return pushStream;
    }