Crate rust_tts_wrapper 

rust-tts-wrapper

Cross-platform TTS (Text-to-Speech) wrapper with a C ABI. Mirrors js-tts-wrapper and SwiftTTSWrapper, supporting 21 engines: system (speech-dispatcher), Sherpa-ONNX (191 local models), and 19 cloud providers.

Quick start (C)

tts_ctx* ctx = tts_create("system", NULL);
tts_speak(ctx, "Hello world");
tts_destroy(ctx);

Modules

engine

Core TTS engine trait.

factory

Engine factory: create engines by ID and list all registered engines.

types

Shared types used across the crate.

Structs

tts_ctx

Functions

tts_create

Create a new TTS engine instance.

tts_destroy

Destroy a TTS context and free all associated resources.

tts_free_bytes

Free a byte buffer returned by tts_synth_to_bytes.

tts_free_engine_info

Free an engine info array previously returned by tts_get_engines.

tts_free_voices

Free a voice array previously returned by tts_get_voices.

tts_get_engine_count

Return the number of registered engines.

tts_get_engines

Write engine descriptors into a caller-allocated array.

tts_get_last_error

Return the last error message as a C string, or null if none.

tts_get_voices

Retrieve the list of available voices for the engine.

tts_pause

Pause in-progress speech.

tts_resume

Resume paused speech.

tts_set_on_audio

Set the callback for streaming audio chunks.

tts_set_on_boundary

Set the callback for word boundary events.

tts_set_pitch

Set the speech pitch (1.0 = normal).

tts_set_rate

Set the speech rate (1.0 = normal).

tts_set_voice

Set the voice for subsequent speak calls.

tts_set_volume

Set the speech volume (1.0 = normal).

tts_speak

Speak text asynchronously using the engine in ctx.

tts_speak_sync

Speak text synchronously (blocks until complete).

tts_stop

Stop any in-progress speech.

tts_synth_to_bytes

Synthesize text to audio bytes without playback. Writes a heap-allocated buffer to *out_bytes and its length to *out_len. Caller must free with tts_free_bytes. Returns 0 on success, -1 on failure.

Type Aliases

CAudioCb

Opaque context holding an engine instance and its per-instance settings.

CBoundaryCb