Rhino Speech-to-Intent
React Native Quick Start

Platforms

• Android (5.0+, API 21+)
• iOS (11.0+)

Requirements

• Picovoice Account and AccessKey
• React Native 0.62.2+

Picovoice Account & AccessKey

Signup or Login to Picovoice Console to get your AccessKey. Make sure to keep your AccessKey secret.

Quick Start

Setup

1. Setup the React Native environment .

2. Install the npm packages:

   • @picovoice/rhino-react-native
   • @picovoice/react-native-voice-processor

npm install @picovoice/react-native-voice-processor @picovoice/rhino-react-native

3. Enable the proper permission for recording with the hardware's microphone on both iOS and Android:

<key>NSMicrophoneUsageDescription</key>
<string>[Permission explanation]</string>

<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.INTERNET" />

Usage

Request audio recording permissions from the user:

const recordAudioRequest = async () => {
  if (Platform.OS == 'android') {
    // Android requires an explicit call to ask for permission
    const granted = await PermissionsAndroid.request(
      PermissionsAndroid.PERMISSIONS.RECORD_AUDIO,
      {
        title: 'Microphone Permission',
        message: '[Permission explanation]',
        buttonNeutral: 'Ask Me Later',
        buttonNegative: 'Cancel',
        buttonPositive: 'OK',
      }
    );
    return (granted === PermissionsAndroid.RESULTS.GRANTED)
  } else {
    // iOS will automatically ask for permission
    return true;
  }
};

const hasPermission = await recordAudioRequest();

Create an instance of RhinoManager that infers intent from spoken commands within a given context :

import {RhinoManager} from '@picovoice/rhino-react-native';

let inferenceCallback = (inference) => {
  if (inference.isUnderstood) {
    let intent = inference.intent;
    let slots = inference.slots;
    // take action based on inferred intent and slot values
  } else {
    // handle unsupported commands
  }
};

let rhinoManager = await RhinoManager.create(
  "${ACCESS_KEY}",
  "${CONTEXT_FILE_PATH}",
  inferenceCallback
);

Once you have instantiated a RhinoManager, you can start audio capture and intent inference by calling:

let didStart = await this._rhinoManager.process();

When RhinoManager returns an inference result via the inferenceCallback, it will automatically stop audio capture for you. When you wish to result, call .process() again.

Once your app is done with using RhinoManager, be sure you explicitly release the resources allocated for it:

await rhinoManager.delete();

Custom Contexts

Create a custom context using the Picovoice Console . Download the custom context file (.rhn) and add it to the platform projects:

• Android custom models must be added to ./android/app/src/main/assets/.

• iOS custom models can be added anywhere under ./ios, but they must be included as a bundled resource in XCode by right-clicking on the Navigation tab, and clicking Add Files To ....

Alternatively, if the context file is deployed to the device with a different method, the absolute path to the file on device can be used.

Non-English Languages

Use the corresponding model file (.pv), to detect non-English wake words. The model files for all supported languages are available on the Rhino GitHub repository .

Add the model file to your assets/resource directory and pass in the relative path using the modelPath argument:

let rhinoManager = await RhinoManager.create(
  "${ACCESS_KEY}",
  "${CONTEXT_FILE_PATH}",
  inferenceCallback,
  processErrorCallback,
  "${MODEL_FILE_PATH}"
);

Alternatively, if the model file is deployed to the device with a different method, the absolute path to the file on device can be used.

Demo

For the Rhino React Native SDK, there is a React Native demo project available on the Rhino GitHub repository .

Setup

Clone the Rhino repository from GitHub:

git clone --recurse-submodules https://github.com/Picovoice/rhino.git

Usage

1. Install dependencies and setup environment:

cd rhino/demo/react-native

npm run android-install
# or
npm run ios-install

2. Connect a mobile device or launch a simulator. Then run the android-run or ios-run and replace ${LANGUAGE} with the language code of your choice (e.g. de -> German, ko -> Korean). To see a list of available languages, command without a language code.

npm run android-run ${LANGUAGE}
# or
npm run ios-run ${LANGUAGE}

For more information on our Rhino demos for React Native, head over to our GitHub repository .

Resources