app.py

import os
from pathlib import Path

import numpy as np
import gradio as gr
from huggingface_hub import hf_hub_download
from TTS.api import TTS

# ---------- Config for your private model repo ----------
REPO_ID = "DhanuakaDev/SinTts-prev-v0.1"  # private model repo
CHECKPOINT_FILENAME = "checkpoint_80000.pth"  # change if your file name differs
CONFIG_FILENAME = "config.json"

# Get token from Space secret (Settings -> Variables and secrets)
HF_TOKEN = os.environ.get("HF_TOKEN")

# ---------- Download files from private repo ----------
# hf_hub_download returns a local path in the cache
checkpoint_path = hf_hub_download(
    repo_id=REPO_ID,
    filename=CHECKPOINT_FILENAME,
    token=HF_TOKEN,      # required for private repos
    repo_type="model",   # explicit, though "model" is default
)

config_path = hf_hub_download(
    repo_id=REPO_ID,
    filename=CONFIG_FILENAME,
    token=HF_TOKEN,
    repo_type="model",
)

# ---------- Load TTS model (same style as your local script) ----------
tts = TTS(
    model_path=str(checkpoint_path),
    config_path=str(config_path),
    progress_bar=False,
    gpu=False,   # Space uses CPU; enable GPU only if you switch hardware
)

SAMPLE_RATE = tts.synthesizer.output_sample_rate

# ---------- Inference function ----------
def tts_generate(text: str):
    text = text.strip()
    if not text:
        return None

    # Generate audio (same call as in your local script)
    wav = tts.tts(text)

    # Ensure numpy 1D array for Gradio
    wav = np.asarray(wav, dtype="float32").flatten()

    # Gradio Audio(type="numpy") expects (sample_rate, np.ndarray)
    return (SAMPLE_RATE, wav)

# ---------- Gradio UI ----------
demo = gr.Interface(
    fn=tts_generate,
    inputs=gr.Textbox(
        label="Input text",
        placeholder="Type Sinhala text here…",
        lines=3,
    ),
    outputs=gr.Audio(
        label="Generated speech",
        type="numpy",
    ),
    title="Sinhala TTS ",
    description="Sinhala TTS model - Research-stage model",
)

if __name__ == "__main__":
    demo.launch()