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farfromrefug committed Feb 7, 2022
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# @nativescript-community/texttospeech :loudspeaker:

A Text to Speech NativeScript plugin for Android & iOS

#### Native Controls

- Android - [TextToSpeech](https://developer.android.com/reference/android/speech/tts/TextToSpeech.html)
- iOS - [AVSpeechSynthesizer](https://developer.apple.com/reference/avfoundation/avspeechsynthesizer)
- Android - [TextToSpeech](https://developer.android.com/reference/android/speech/tts/TextToSpeech.html)
- iOS - [AVSpeechSynthesizer](https://developer.apple.com/reference/avfoundation/avspeechsynthesizer)

## Installation

Run the following command from the root of your project:


```
tns plugin add @nativescript-community/texttospeech
```
Expand All @@ -37,41 +36,41 @@ import { TNSTextToSpeech, SpeakOptions } from '@nativescript-community/texttospe
const TTS = new TNSTextToSpeech();

const speakOptions: SpeakOptions = {
text: 'Whatever you like', /// *** required ***
speakRate: 0.5, // optional - default is 1.0
pitch: 1.0, // optional - default is 1.0
volume: 1.0, // optional - default is 1.0
locale: 'en-GB', // optional - default is system locale,
finishedCallback: Function, // optional
text: 'Whatever you like', /// *** required ***
speakRate: 0.5, // optional - default is 1.0
pitch: 1.0, // optional - default is 1.0
volume: 1.0, // optional - default is 1.0
locale: 'en-GB', // optional - default is system locale,
finishedCallback: Function, // optional
};

// Call the `speak` method passing the SpeakOptions object
TTS.speak(speakOptions).then(
() => {
// everything is fine
},
(err) => {
// oops, something went wrong!
}
() => {
// everything is fine
},
(err) => {
// oops, something went wrong!
}
);
```

#### API

- `speak(options: SpeakOptions): Promise<any>` - start speaking with the given options
- `pause(): void` - pause the speech
- `resume(): void` - resume the speech
- `destroy(): void` - release resources for the speech synthesizer/engine

- `SpeakOptions = {}`
- `text: string` ** required **
- `queue?: boolean = false`
- `pitch?: number = 1.0`
- `speakRate?: number = 1.0`
- `volume?: number = 1.0`
- `locale?: string = default system locale`
- `language?: string = default system language` ** Android only **
- `finishedCallback?: Function`
- `speak(options: SpeakOptions): Promise<any>` - start speaking with the given options
- `pause(): void` - pause the speech
- `resume(): void` - resume the speech
- `destroy(): void` - release resources for the speech synthesizer/engine

- `SpeakOptions = {}`
- `text: string` ** required **
- `queue?: boolean = false`
- `pitch?: number = 1.0`
- `speakRate?: number = 1.0`
- `volume?: number = 1.0`
- `locale?: string = default system locale`
- `language?: string = default system language` ** Android only **
- `finishedCallback?: Function`

If you wish to set a custom locale, you need to provide a valid BCP-47 code, e.g. `en-US`. If you wish to set only a custom language (without a preferred country code), you need to provide a valid ISO 639-1 language code. If both are set, the custom locale will be used.

Expand All @@ -81,28 +80,28 @@ Example with language code only:

```js
const speakOptions: SpeakOptions = {
text: 'Whatever you like', // *** required ***
language: 'en', // english language will be used
text: 'Whatever you like', // *** required ***
language: 'en', // english language will be used
};
```

Example with locale:

```js
const speakOptions: SpeakOptions = {
text: 'Whatever you like', // *** required ***
locale: 'en-AU', // australian english language will be used
text: 'Whatever you like', // *** required ***
locale: 'en-AU', // australian english language will be used
};
```

### Tip

- The speech synthesizer takes a moment to initialize on most devices. A simple way to get around this (tested in the demo app) is to create your new instance of the TNSTextToSpeech and then immediately call the `init` method . This will force the synthesizer to "warm up" . Now when you call the `speak` method for your app's functionality it will already have "warmed up" the synthesizer so the delay should be minimal.
It's possible this "Warm up" process could be put into the plugin source itself, I don't have time to do it right now but welcome any contribution that is well tested to make this the default behavior of the synthesizers.
- The speech synthesizer takes a moment to initialize on most devices. A simple way to get around this (tested in the demo app) is to create your new instance of the TNSTextToSpeech and then immediately call the `init` method . This will force the synthesizer to "warm up" . Now when you call the `speak` method for your app's functionality it will already have "warmed up" the synthesizer so the delay should be minimal.
It's possible this "Warm up" process could be put into the plugin source itself, I don't have time to do it right now but welcome any contribution that is well tested to make this the default behavior of the synthesizers.

### Android Only Methods

- `getAvailableLanguages(): Promise<Array<Language>>;` - returns an array of available languages (use to prevent using non-existing language/local codes)
- `getAvailableLanguages(): Promise<Array<Language>>;` - returns an array of available languages (use to prevent using non-existing language/local codes)

## Credits

Expand Down

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