app.py

import torch
import torchaudio
import os
import re
import streamlit as st
from difflib import SequenceMatcher
from transformers import pipeline

# Device setup
device = "cuda" if torch.cuda.is_available() else "cpu"

# Load Whisper model for transcription
MODEL_NAME = "alvanlii/whisper-small-cantonese"
language = "zh"
pipe = pipeline(
    task="automatic-speech-recognition",
    model=MODEL_NAME,
    chunk_length_s=60,
    device=device
)
pipe.model.config.forced_decoder_ids = pipe.tokenizer.get_decoder_prompt_ids(language=language, task="transcribe")

# Load quality rating model
rating_pipe = pipeline("text-classification", model="tabularisai/multilingual-sentiment-analysis")

# Sentiment label mapping
label_map = {"Negative": "Very Poor", "Neutral": "Neutral", "Positive": "Very Good"}

def remove_punctuation(text):
    return re.sub(r'[^\w\s]', '', text)

def transcribe_audio(audio_path):
    transcript = pipe(audio_path)["text"]
    return remove_punctuation(transcript)

def rate_quality(text):
    result = rating_pipe(text)[0]
    return label_map.get(result["label"], "Unknown")

# Streamlit UI
st.set_page_config(page_title="Cantonese Audio Transcription & Analysis", layout="centered")
st.title("🗣️ Cantonese Audio Transcriber & Sentiment Analyzer")
st.markdown("Upload your Cantonese audio file, and we will transcribe and analyze its sentiment.")

uploaded_file = st.file_uploader("Upload an audio file (WAV, MP3, etc.)", type=["wav", "mp3", "m4a"])
if uploaded_file is not None:
    with st.spinner("Processing audio..."):
        temp_audio_path = "temp_audio.wav"
        with open(temp_audio_path, "wb") as f:
            f.write(uploaded_file.getbuffer())
        transcript = transcribe_audio(temp_audio_path)
        sentiment = rate_quality(transcript)
        os.remove(temp_audio_path)
    
    st.subheader("Transcription")
    st.text_area("", transcript, height=150)
    
    st.subheader("Sentiment Analysis")
    st.markdown(f"### 🎭 Sentiment: **{sentiment}**")
    
    st.success("Processing complete! 🎉")