#Speech

Convert text to speech using Apple's on-device speech synthesis capabilities.

#Overview

This provider uses Apple's AVSpeechSynthesizer to perform text-to-speech entirely on-device. Audio is synthesized locally and returned to your app as a WAV byte stream.

#Requirements

• iOS 13+ – Required for programmatic audio rendering with AVSpeechSynthesizer.write(...).
• iOS 17+ – Required to use Personal Voice if available on device.

#Usage

#Basic Speech

import { apple } from '@react-native-ai/apple'
import { experimental_generateSpeech as speech } from 'ai'

const response = await speech({
  model: apple.speechModel(),
  text: 'Hello from Apple on-device speech!',
})

// Access the buffer in a preferred way
console.log(response.audio.uint8Array)
console.log(response.audio.base64)

#Language and Voice Selection

You can control the output language or select a specific voice by identifier. To see what voices are available on the device:

import { AppleSpeech } from '@react-native-ai/apple'

const voices = await AppleSpeech.getVoices()

Use a specific voice by passing its identifier:

await speech({
  model: apple.speechModel(),
  text: 'Custom voice synthesis',
  voice: 'com.apple.voice.super-compact.en-US.Samantha',
})

Or specify only language to use the system’s default voice for that locale:

await speech({
  model: apple.speechModel(),
  text: 'Bonjour tout le monde!',
  language: 'en-US',
})

#Voices and Asset Management

The system provides a catalog of built‑in voices, including enhanced and premium variants, which may require a one‑time system download. If you have created a Personal Voice on device (iOS 17+), it appears in the list and is flagged accordingly.

#Direct API Access

For advanced use cases, you can access the speech API directly:

#AppleSpeech

import { AppleSpeech } from '@react-native-ai/apple'

// List available voices (identifier, name, language, quality, traits)
const voices = await AppleSpeech.getVoices()

// Generate audio as an ArrayBuffer-like WAV payload
const buffer = await AppleSpeech.generate('Hello world', {
  language: 'en-US',
})

// Convert to Uint8Array if needed

Returned voice objects include:

• identifier: string
• name: string
• language: BCP‑47 code, e.g. en-US
• quality: default | enhanced | premium
• isPersonalVoice: boolean (iOS 17+)
• isNoveltyVoice: boolean (iOS 17+)

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