app.py

import gradio as gr
from transformers import pipeline
import numpy as np

# ─── LOAD MODEL ───────────────────────────────────────────

classifier = pipeline(
    "audio-classification",
    model="MIT/ast-finetuned-audioset-10-10-0.4593"
)

# ─── THREAT MAPPING ───────────────────────────────────────

def map_label(label, score):
    label = label.lower()

    if "engine" in label:
        return f"🪚 Chainsaw detected ({round(score, 2)})"

    if "gunshot" in label or "bang" in label or "explosion" in label:
        return f"🔫 Gunshot detected ({round(score, 2)})"

    if "vehicle" in label or "car" in label or "truck" in label:
        return f"🚗 Vehicle detected ({round(score, 2)})"

    if "speech" in label or "talk" in label or "shout" in label:
        return f"👤 Human detected ({round(score, 2)})"

    return f"🌿 Safe: {label} ({round(score, 2)})"

# ─── PREDICTION ───────────────────────────────────────────

def predict(audio):
    if audio is None:
        return "🎤 Waiting for audio..."

    sr, data = audio

    # Convert stereo → mono
    if len(data.shape) > 1:
        data = data.mean(axis=1)

    data = data.astype(np.float32)

    results = classifier({
        "raw": data,
        "sampling_rate": sr
    })

    top = results[0]

    # 🔥 APPLY MAPPING HERE
    return map_label(top["label"], top["score"])

# ─── UI ───────────────────────────────────────────────────

with gr.Blocks() as demo:
    gr.Markdown("## 🌲 Forest Guardian - Live Audio Detection")

    mic = gr.Audio(
        sources=["microphone"],
        streaming=True,   # 🔥 LIVE STREAMING
        type="numpy"
    )

    output = gr.Textbox(label="Detection Result")

    mic.stream(fn=predict, inputs=mic, outputs=output)

# ─── RUN ──────────────────────────────────────────────────

demo.launch()