espeak-ng-python

espeak-ng

A Python bindings library for the eSpeak NG utility, which is a compact open source software text-to-speech synthesizer with distributions for all major operating systems.

Platform support:

Support	Platform	Architecture	Notes
✅	MacOS	arm64	Tested with M1
✅	Linux	arm64	Tested with Debian (Ubuntu)

Dependencies

This library provides Python bindings for the underlying espeak-ng (or espeak), so obviously, you must have this library installed. Follow instructions below for platform-specific instructions.

MacOS (using brew)

$ brew tap justinokamoto/espeak-ng
$ brew install espeak-ng

Debian (Ubuntu)

# Install espeak library and headers, along with Python's C API headers
$ apt install libespeak-ng-dev python3-dev

Installation

Provided you have installed the required dependencies described from the previous section, you can download this Python package from the Pythin Package Index:

$ pip install espeak-ng-python

Usage

For all functions that this library wraps, it provides a near 1-to-1 wrapper interface, where all parameters are provided with identical names. Only difference being that wrapper functions throw exceptions rather than returning error codes (which is the more 'Pythonic' way of error handling).

For more in-depth documentation you can read the comments within the extension source code here: src/espeak_ng/extension/_espeakngmodule.c

Quick Start

Synchronous Mode

import espeak_ng

# Initialize the espeak library
espeak_ng.initialize()

# This function will return after synthesis is complete
espeak_ng.synth("Hello, world.")

Asynchronous Mode

espeak offers a async interface. Below is an example snippet using this interface:

import espeak_ng

# NOTE: It's important to return 0 on success, otherwise synthesis will stop
def my_callback_func(wav: bytes, num_samples: int, event: espeak_ng.Event) -> int:
  # ... my code here
  return 0

# Initialize the espeak library in an asynchronous output mode
espeak_ng.initialize(output=espeak_AUDIO_OUTPUT.AUDIO_OUTPUT_PLAYBACK)

# This function will return immediately and the callback will be triggered as the synthesis
progresses
espeak_ng.set_synth_callback(my_callback_func)

Configuration

espeak supports various languages. To see all available options, you can list all voices:

import espeak_ng

espeak_ng.list_voices()

To configure the voice, you can use the set_voice_by_properties function. Examples below:

import espeak_ng

espeak_ng.set_voice_by_properties(name="en-us")
espeak_ng.set_voice_by_properties(gender=1)
espeak_ng.set_voice_by_properties(age=30)

Building Locally

Install dependencies from the above "Dependencies" section. Then build this package using pip:

# Use pip to build in development (`-e` is for 'editable install')
$ pip install -e .

To run tests, use the helper runtests script:

$ python3 -m runtests

To build a local distribution archive, run:

$ pip wheel .