app.py

import spaces
import os
import sys
sys.path.append("neutts-air")
from neuttsair.neutts import NeuTTSAir
import numpy as np
import gradio as gr

SAMPLES_PATH = os.path.join(os.getcwd(), "neutts-air", "samples")
DEFAULT_REF_TEXT = "So I'm live on radio. And I say, well, my dear friend James here clearly, and the whole room just froze. Turns out I'd completely misspoken and mentioned our other friend."
DEFAULT_REF_PATH = os.path.join(SAMPLES_PATH, "dave.wav")
DEFAULT_GEN_TEXT = "My name is Dave, and um, I'm from London."

# --- Force CPU usage ---
tts = NeuTTSAir(
    backbone_repo="neuphonic/neutts-air",
    backbone_device="cpu",
    codec_repo="neuphonic/neucodec",
    codec_device="cpu"
)

def infer(
    ref_text: str,
    ref_audio_path: str,
    gen_text: str,
) -> tuple[int, np.ndarray]:
    """
    Generates speech using NeuTTS-Air given a reference audio and text, and new text to synthesize.

    Args:
        ref_text (str): The text corresponding to the reference audio.
        ref_audio_path (str): The file path to the reference audio.
        gen_text (str): The new text to synthesize.
    Returns:
        tuple [int, np.ndarray]: A tuple containing the sample rate (24000) and the generated audio waveform as a numpy array.
    """

    gr.Info("Starting inference request (CPU mode)!")
    gr.Info("Encoding reference...")
    ref_codes = tts.encode_reference(ref_audio_path)

    gr.Info(f"Generating audio for input text: {gen_text}")
    wav = tts.infer(gen_text, ref_codes, ref_text)

    return (24_000, wav)

demo = gr.Interface(
    fn=infer,
    inputs=[
        gr.Textbox(label="Reference Text", value=DEFAULT_REF_TEXT),
        gr.Audio(type="filepath", label="Reference Audio", value=DEFAULT_REF_PATH),
        gr.Textbox(label="Text to Generate", value=DEFAULT_GEN_TEXT),
    ],
    outputs=gr.Audio(type="numpy", label="Generated Speech"),
    title="NeuTTS-Air☁️ (CPU Mode)",
    description="Upload a reference audio sample, provide the reference text, and enter new text to synthesize (running on CPU)."
)

if __name__ == "__main__":
    demo.launch(allowed_paths=[SAMPLES_PATH], mcp_server=True, inbrowser=True)