Google Cloud Text-to-Speech

import os
from google.cloud import texttospeech_v1 as texttospeech

def synthesize_text(text):
    """Synthesizes speech from the input string of text.

    Ensure GOOGLE_APPLICATION_CREDENTIALS environment variable is set
    or authenticate using `gcloud auth application-default login`.
    """

    # Instantiates a client
    client = texttospeech.TextToSpeechClient()

    # 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,
    )

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

    # Perform the text-to-speech request
    response = client.synthesize_speech(
        input=synthesis_input,
        voice=voice,
        audio_config=audio_config
    )

    # The response's audio_content is binary. Write it to a file.
    output_filename = "output.mp3"
    with open(output_filename, "wb") as out:
        out.write(response.audio_content)
    print(f'Audio content written to file "{output_filename}"')

if __name__ == "__main__":
    # For local development, set the GOOGLE_APPLICATION_CREDENTIALS environment variable.
    # For example: os.environ['GOOGLE_APPLICATION_CREDENTIALS'] = '/path/to/your/key.json'
    # Or use `gcloud auth application-default login`
    if not os.environ.get('GOOGLE_APPLICATION_CREDENTIALS'):
        print("Warning: GOOGLE_APPLICATION_CREDENTIALS not set. Assuming gcloud ADC is configured.")

    text_to_synthesize = "Hello, world! This is a test of the Google Cloud Text-to-Speech API."
    synthesize_text(text_to_synthesize)