MediaPipe Audio Task that performs neural text-to-speech synthesis in unary and streaming modes via WASM SIMD or WebGPU.
Signature:
export declare class TextToSpeech extends TaskRunner
Methods
| Method | Modifiers | Description |
|---|---|---|
| createFromOptions(wasmFileset, options) | static |
Initializes the Wasm runtime and creates a new TextToSpeech instance based on the provided options. |
| createFromModelPath(wasmFileset, modelAssetPath) | static |
Initializes the Wasm runtime and creates a new TextToSpeech instance from a model asset path. |
| createFromModelBuffer(wasmFileset, modelAssetBuffer) | static |
Initializes the Wasm runtime and creates a new TextToSpeech instance from a model asset buffer or stream. |
| setOptions(options) | Sets the options for TextToSpeech and initializes the underlying engine. Options cannot be updated once the engine has been created. |
|
| listVoices() | Queries available voices bundled in the initialized model. | |
| synthesize(text, options) | Synthesizes a complete utterance and returns the full PCM audio buffer. | |
| synthesizeStream(initialText, options, finishInput) | Starts a streaming synthesis session returning a TextToSpeechStream (supporting both readNext() and for await (const chunk of stream)). |
|
| cancel() | Cancels any in-flight unary or streaming synthesis on this TextToSpeech instance. |
|
| close() | Closes the TextToSpeech instance and releases native engine and Wasm memory. |
TextToSpeech.createFromOptions()
Initializes the Wasm runtime and creates a new TextToSpeech instance based on the provided options.
Signature:
static createFromOptions(wasmFileset: WasmFileset, options: TextToSpeechOptions): Promise<TextToSpeech>;
Parameters
| Parameter | Type | Description |
|---|---|---|
| wasmFileset | WasmFileset | A configuration object that provides the location of the Wasm binary and its loader. |
| options | TextToSpeechOptions | The options for TextToSpeech. Note that either a path to the model or the model buffer itself must be provided via baseOptions. |
Returns:
Promise<TextToSpeech>
TextToSpeech.createFromModelPath()
Initializes the Wasm runtime and creates a new TextToSpeech instance from a model asset path.
Signature:
static createFromModelPath(wasmFileset: WasmFileset, modelAssetPath: string | string): Promise<TextToSpeech>;
Parameters
| Parameter | Type | Description |
|---|---|---|
| wasmFileset | WasmFileset | A configuration object that provides the location of the Wasm binary and its loader. |
| modelAssetPath | string | string | The path or URL to the .litertlm model asset. |
Returns:
Promise<TextToSpeech>
TextToSpeech.createFromModelBuffer()
Initializes the Wasm runtime and creates a new TextToSpeech instance from a model asset buffer or stream.
Signature:
static createFromModelBuffer(wasmFileset: WasmFileset, modelAssetBuffer: Uint8Array | ReadableStreamDefaultReader): Promise<TextToSpeech>;
Parameters
| Parameter | Type | Description |
|---|---|---|
| wasmFileset | WasmFileset | A configuration object that provides the location of the Wasm binary and its loader. |
| modelAssetBuffer | Uint8Array | ReadableStreamDefaultReader | A Uint8Array or ReadableStreamDefaultReader containing the .litertlm model bytes. |
Returns:
Promise<TextToSpeech>
TextToSpeech.setOptions()
Sets the options for TextToSpeech and initializes the underlying engine. Options cannot be updated once the engine has been created.
Signature:
setOptions(options: TextToSpeechOptions): Promise<void>;
Parameters
| Parameter | Type | Description |
|---|---|---|
| options | TextToSpeechOptions | The options for TextToSpeech. |
Returns:
Promise<void>
TextToSpeech.listVoices()
Queries available voices bundled in the initialized model.
Signature:
listVoices(): Promise<VoiceInfo[]>;
Returns:
Promise<VoiceInfo[]>
TextToSpeech.synthesize()
Synthesizes a complete utterance and returns the full PCM audio buffer.
Signature:
synthesize(text: string, options?: SynthesisOptions): Promise<TextToSpeechResult>;
Parameters
| Parameter | Type | Description |
|---|---|---|
| text | string | The text to synthesize. |
| options | SynthesisOptions | Optional per-utterance voice or locale overrides. |
Returns:
Promise<TextToSpeechResult>
TextToSpeech.synthesizeStream()
Starts a streaming synthesis session returning a TextToSpeechStream (supporting both readNext() and for await (const chunk of stream)).
Signature:
synthesizeStream(initialText?: string, options?: SynthesisOptions, finishInput?: boolean): Promise<TextToSpeechStream>;
Parameters
| Parameter | Type | Description |
|---|---|---|
| initialText | string | Initial text to synthesize (pass "" when streaming incremental LLM text deltas via stream.pushText()). |
| options | SynthesisOptions | Optional per-utterance voice or locale overrides. |
| finishInput | boolean | Pass true (default) for single-utterance streaming, or false to keep the input stream open for stream.pushText() and stream.finishInput(). |
Returns:
Promise<TextToSpeechStream>
TextToSpeech.cancel()
Cancels any in-flight unary or streaming synthesis on this TextToSpeech instance.
Signature:
cancel(): void;
Returns:
void
TextToSpeech.close()
Closes the TextToSpeech instance and releases native engine and Wasm memory.
Signature:
close(): void;
Returns:
void