app.py

import os
import librosa
import numpy as np
import joblib
import gradio as gr
from huggingface_hub import hf_hub_download

# --- Load model from Hugging Face Hub ---
MODEL_REPO = "sangambhamare/TruthDetection"
MODEL_FILENAME = "model.joblib"
model_path = hf_hub_download(repo_id=MODEL_REPO, filename=MODEL_FILENAME)
model = joblib.load(model_path)

# --- Load interactive report HTML (must be in same directory) ---
report_html = ""
if os.path.exists("interactive_report.html"):
    with open("interactive_report.html", "r", encoding="utf-8") as f:
        report_html = f.read()

# --- MFCC feature extraction ---
def extract_mfcc(file_path):
    y, sr = librosa.load(file_path, sr=None)
    mfcc = librosa.feature.mfcc(y=y, sr=sr, n_mfcc=13)
    return np.mean(mfcc, axis=1)

# --- Prediction function ---
def predict_audio(audio_file):
    try:
        features = extract_mfcc(audio_file).reshape(1, -1)
        prediction = model.predict(features)[0]
        return "True Story" if prediction == 1 else "Deceptive Story"
    except Exception as e:
        return f"Error: {e}"

# --- Gradio Interface ---
with gr.Blocks() as demo:
    gr.Markdown("<h1 style='text-align: center;'>Truth Detection from Audio Stories</h1>")
    gr.Markdown(
        "<p style='text-align: center;'>"
        "This tool analyzes an audio story and predicts whether it is true or deceptive "
        "based on MFCC features and a trained Random Forest classifier."
        "</p>"
    )

    audio_input = gr.Audio(type="filepath", label="Upload WAV Audio File")
    output = gr.Textbox(label="Prediction")
    submit_btn = gr.Button("Predict")
    submit_btn.click(fn=predict_audio, inputs=audio_input, outputs=output)

    if report_html:
        gr.Markdown("<hr>")
        gr.Markdown("<h3 style='text-align: center;'>Interactive Report</h3>")
        gr.HTML(value=report_html)

    gr.Markdown("<p style='text-align: center; font-size: 12px; color: gray;'>Developed by Sangam Sanjay Bhamare, 2025.</p>")

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