node-client-voice.js

//"houndify" module contains both client-side ("HoundifyClient") and server-side ("HoundifyExpress") parts of SDK
var Houndify = require('houndify');
var wav = require('wav');
var fs = require('fs');
var path = require('path');

//parse arguments
var argv = require('minimist')(process.argv.slice(2));

//config file
var configFile = argv.config || 'config.json';
var config = require(path.join(__dirname, configFile));


function startVoiceRequest(sampleRate) {
  return new Houndify.VoiceRequest({

    clientId:  config.clientId, 
    clientKey: config.clientKey,

    sampleRate: sampleRate,
    enableVAD: true,

    //REQUEST INFO JSON
    //see https://houndify.com/reference/RequestInfo
    requestInfo: {
      UserID: "test_user",
      Latitude: 37.388309, 
      Longitude: -121.973968
    },

    onResponse: function(response, info) {
      console.log(response);
    },

    onTranscriptionUpdate: function(trObj) {
      console.log("Partial Transcript:", trObj.PartialTranscript);
    },

    onError: function(err, info) {
      console.log(err);
    }
    
  });
}


//Read wave file and stream it to Houndify backend
var voiceRequest;
var reader = new wav.Reader();

reader.on('format', function (format) {
  voiceRequest = startVoiceRequest(format.sampleRate);
});

reader.on('data', function (chunk) {
  var arrayBuffer = new Uint8Array(chunk).buffer;
  var view = new Int16Array(arrayBuffer);
  voiceRequest.write(view);
});

reader.on('end', function() { 
  voiceRequest.end(); 
});

var audioFile = argv.audio || path.join('test_audio', 'whatistheweatherthere.wav');
var audioFilePath = path.join(__dirname, audioFile);
var file = fs.createReadStream(audioFilePath);
file.pipe(reader);