React Native TTS is a text-to-speech library for React Native on iOS and Android.
npm install --save react-native-tts
react-native linkimport Tts from 'react-native-tts';Add utterance to TTS queue and start speaking. Returns promise with utteranceId.
Tts.speak('Hello, world!');Additionally, speak() allows to pass platform-specific options 'voiceId' on IOS and 'params' on Android to underlying platform API:
Tts.speak('Hello, world!', { iosVoiceId: 'com.apple.ttsbundle.Moira-compact' });
Tts.speak('Hello, world!', { androidParams: { KEY_PARAM_PAN: -1, KEY_PARAM_VOLUME: 0.5 } });Stop speaking and flush the TTS queue.
Tts.stop();On some platforms it could take some time to initialize TTS engine, and Tts.speak() will fail to speak until the engine is ready.
To wait for successfull initialization you could use getInitStatus() call.
Tts.getInitStatus().then(() => {
Tts.speak('Hello, world!');
});Enable lowering other applications output level while speaking (also referred to as "ducking").
Tts.setDucking(true);Returns list of available voices
(not supported on Android API Level < 21, returns empty list)
Tts.voices().then(voices => console.log(voices));
// Prints:
//
// [ { id: 'com.apple.ttsbundle.Moira-compact', name: 'Moira', language: 'en-IE', quality: 300 },
// ...
// { id: 'com.apple.ttsbundle.Samantha-compact', name: 'Samantha', language: 'en-US' } ]| Voice field | Description |
|---|---|
| id | Unique voice identifier (e.g. com.apple.ttsbundle.Moira-compact) |
| name | Name of the voice (iOS only) |
| language | BCP-47 language code (e.g. 'en-US') |
| quality | Voice quality (300 = normal, 500 = enhanced/very high) |
| latency | Expected synthesizer latency (100 = very low, 500 = very high) (Android only) |
| networkConnectionRequired | True when the voice requires an active network connection (Android only) |
| notInstalled | True when the voice may need to download additional data to be fully functional (Android only) |
Tts.setDefaultLanguage('en-IE');Sets default voice, pass one of the voiceId as reported by a call to Tts.voices()
(not available on Android API Level < 21)
Tts.setDefaultVoice('com.apple.ttsbundle.Moira-compact');Sets default speech rate. The rate parameter is a float where where 0.01 is a slowest rate and 0.99 is the fastest rate.
Tts.setDefaultRate(0.6);There is a significant difference to how the rate value is interpreted by iOS and Android native TTS APIs. To provide unified cross-platform behaviour, translation is applied to the rate value. However, if you want to turn off the translation, you can provide optional skipTransform parameter to Tts.setDefaultRate() to pass rate value unmodified.
Do not translate rate parameter:
Tts.setDefaultRate(0.6, true);Sets default pitch. The pitch parameter is a float where where 1.0 is a normal pitch. On iOS min pitch is 0.5 and max pitch is 2.0
Tts.setDefaultPitch(1.5);Subscribe to TTS events
Tts.addEventListener('tts-start', (event) => console.log("start", event));
Tts.addEventListener('tts-finish', (event) => console.log("finish", event));
Tts.addEventListener('tts-cancel', (event) => console.log("cancel", event));Copyright © 2016 Anton Krasovsky
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