app/speech_google.py

"""Synthesizes speech from the input string of text or ssml.
Make sure to be working in a virtual environment.

Note: ssml must be well-formed according to:
    https://www.w3.org/TR/speech-synthesis/
"""
from google.cloud import texttospeech
from loguru import logger

class Speech:

    def __init__(self) -> None:

        # Instantiates a client
        self.client = texttospeech.TextToSpeechClient()

        # Select the type of audio file you want returned
        self.audio_config = texttospeech.AudioConfig(
            audio_encoding=texttospeech.AudioEncoding.MP3
        )

        logger.info(f"Initialized Speech()")

    def text_to_speech(self, text:str, language:str):

        logger.info(f"Converting text to speech.")

        # Set the text input to be synthesized
        synthesis_input = texttospeech.SynthesisInput(text=text)

        # Build the voice request, select the language code ("en-US") and the ssml
        # voice gender ("neutral")
        voice = texttospeech.VoiceSelectionParams(
            language_code="en-US", 
            ssml_gender=texttospeech.SsmlVoiceGender.NEUTRAL
        )

        # Perform the text-to-speech request on the text input with the selected
        # voice parameters and audio file type
        response = self.client.synthesize_speech(
            input=synthesis_input, voice=voice, audio_config=self.audio_config
        )

        # The response's audio_content is binary.
        with open("output.mp3", "wb") as out:
            # Write the response to the output file.
            out.write(response.audio_content)
            logger.info('Audio content written to file "output.mp3"')