@colleague/speech-recognition-aws-polyfill
v0.3.1
Published
Polyfill for the SpeechRecognition browser API using AWS Transcribe
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speech-recognition-aws-polyfill
A polyfill for the experimental browser Speech Recognition API which falls back to AWS Transcribe.
Features
- Works without a server (browser-only)
- Supports the following browsers/versions (~94% coverage)
Note: this is not a polyfill for MediaDevices.getUserMedia()
- check the support table in the link above.
Who is it for?
This Library is a good fit if you are already using AWS services (or you would just prefer to use AWS).
A polyfill also exists at: /antelow/speech-polyfill, which uses Azure Cognitive Services as a fallback. However, it seems to have gone stale with no updates for ~2 years.
Prerequisites
- An AWS account
- A Cognito identity pool (unauthenticated or authenticated) with the
TranscribeStreaming
permission.
AWS Setup Guide
- In the AWS console, visit the Cognito section and click Manage Identity Pools.
- Click Create new identity pool and give it a name.
- To allow anyone who visits your app to use speech recognition (e.g. for public-facing web apps) check Enable access to unauthenticated identities
- If you want to configure authentication instead, do so now.
- Click Create Pool
- Choose or create a role for your users. If you are just using authenticated sessions, you are only interested in the second section. If you aren't sure what to do here, the default role is fine.
- Make sure your role has the
TranscribeStreaming
policy attached. To attach this to your role search for IAM -> Roles, find your role, click "Attach policies" and search for the TranscribeStreaming role. - Go back to Cognito and find your identity pool. Click Edit identity pool in the top right and make a note of your Identity pool ID
Usage
Install with npm i --save speech-recognition-aws-polyfill
Import into your application:
import SpeechRecognitionPolyfill from 'speech-recognition-aws-polyfill'
Or use from the unpkg CDN:
<script src="https://unpkg.com/speech-recognition-aws-polyfill"></script>
Create a new instance of the polyfill:
const recognition = new SpeechRecognitionPolyfill({
IdentityPoolId: 'eu-west-1:11111111-1111-1111-1111-1111111111', // your Identity Pool ID
region: 'eu-west-1' // your AWS region
})
Alternatively, use the create
method.
const SpeechRecognition = SpeechRecognititionPolyfill.create({
IdentityPoolId: 'eu-west-1:11111111-1111-1111-1111-1111111111', // your Identity Pool ID
region: "eu-west-1"
});
const recognition = new SpeechRecognition()
You can then interact with recognition
the same as you would with an instance of window.SpeechRecognition
The recognizer will stop capturing if it doesn't detect speech for a period. You can also stop manually with the stop()
method.
Support Table
Properties
| Property | Supported |
|-------------------|-----------|
| lang
| Yes |
| grammars
| No |
| continuous
| Yes |
| interimResults
| No |
| maxAlternatives
| No |
| serviceURI
| No |
Methods
| Method | Supported |
|-------------------|-----------|
| abort
| Yes |
| start
| Yes |
| stop
| Yes |
Events
| Events | Supported |
|---------------|-----------|
| audiostart
| Yes |
| audioend
| Yes |
| start
| Yes |
| end
| Yes |
| error
| Yes |
| nomatch
| Yes |
| result
| Yes |
| soundstart
| Partial |
| soundend
| Partial |
| speechstart
| Partial |
| speechend
| Partial |
Full Example
import SpeechRecognitionPolyfill from 'speech-recognition-aws-polyfill'
const recognition = new SpeechRecognitionPolyfill({
IdentityPoolId: 'eu-west-1:11111111-1111-1111-1111-1111111111', // your Identity Pool ID
region: 'eu-west-1' // your AWS region
})
recognition.lang = 'en-US'; // add this to the config above instead if you want
document.body.onclick = function() {
recognition.start();
console.log('Listening');
}
recognition.onresult = function(event) {
const { transcript } = event.results[0][0]
console.log('Heard: ', transcript)
}
recognition.onerror = console.error
Roadmap
- Further increase parity between the two implementations by better supporting additional options and events.
- Build a companion polyfill for speech synthesis (TTS) using AWS Polly
- Provide a way to output the transcription as an RxJS observable
Contributing and Bugs
Questions, comments and contributions are very welcome. Just raise an Issue/PR (or, check out the fancy new Github Discussions feature)
License
MIT