app.py

"""
Main entry point for the Audio Translation Web Application
Handles file upload, processing pipeline, and UI rendering
"""

import logging
logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
    handlers=[
        logging.FileHandler("app.log"),
        logging.StreamHandler()
    ]
)
logger = logging.getLogger(__name__)

import streamlit as st
import os
import time
import subprocess
from utils.stt import transcribe_audio
from utils.translation import translate_text
from utils.tts import get_tts_engine, generate_speech

# Initialize environment configurations
os.makedirs("temp/uploads", exist_ok=True)
os.makedirs("temp/outputs", exist_ok=True)

def configure_page():
    """Set up Streamlit page configuration"""
    logger.info("Configuring Streamlit page")
    st.set_page_config(
        page_title="Audio Translator",
        page_icon="🎧",
        layout="wide",
        initial_sidebar_state="expanded"
    )
    st.markdown("""
        <style>
            .reportview-container {margin-top: -2em;}
            #MainMenu {visibility: hidden;}
            .stDeployButton {display:none;}
            .stAlert {padding: 20px !important;}
        </style>
    """, unsafe_allow_html=True)

def handle_file_processing(upload_path):
    """
    Execute the complete processing pipeline:
    1. Speech-to-Text (STT)
    2. Machine Translation
    3. Text-to-Speech (TTS)
    """
    logger.info(f"Starting processing for: {upload_path}")
    progress_bar = st.progress(0)
    status_text = st.empty()
    
    try:
        # STT Phase
        logger.info("Beginning STT processing")
        status_text.markdown("🔍 **Performing Speech Recognition...**")
        with st.spinner("Initializing Whisper model..."):
            english_text = transcribe_audio(upload_path)
        progress_bar.progress(30)
        logger.info(f"STT completed. Text length: {len(english_text)} characters")

        # Translation Phase
        logger.info("Beginning translation")
        status_text.markdown("🌐 **Translating Content...**")
        with st.spinner("Loading translation model..."):
            chinese_text = translate_text(english_text)
        progress_bar.progress(60)
        logger.info(f"Translation completed. Translated length: {len(chinese_text)} characters")

        # TTS Phase
        logger.info("Beginning TTS generation")
        status_text.markdown("🎵 **Generating Chinese Speech...**")
        
        # Initialize TTS engine with appropriate language code for Chinese
        engine = get_tts_engine(lang_code='z')  # 'z' for Mandarin Chinese
        
        # Generate speech and get the file path
        output_path = engine.generate_speech(chinese_text, voice="zf_xiaobei")
        progress_bar.progress(100)
        logger.info(f"TTS completed. Output file: {output_path}")
        
        # Store the text for streaming playback
        st.session_state.current_text = chinese_text
        
        status_text.success("✅ Processing Complete!")
        return english_text, chinese_text, output_path
        
    except Exception as e:
        logger.error(f"Processing failed: {str(e)}", exc_info=True)
        status_text.error(f"❌ Processing Failed: {str(e)}")
        st.exception(e)
        raise

def render_results(english_text, chinese_text, output_path):
    """Display processing results in organized columns"""
    logger.info("Rendering results")
    st.divider()
    
    col1, col2 = st.columns([2, 1])
    with col1:
        st.subheader("Recognition Results")
        st.code(english_text, language="text")
        
        st.subheader("Translation Results")
        st.code(chinese_text, language="text")

    with col2:
        st.subheader("Audio Output")
        # Standard audio player for the full file
        st.audio(output_path)
        
        # Download button
        with open(output_path, "rb") as f:
            st.download_button(
                label="Download Audio",
                data=f,
                file_name="translated_audio.wav",
                mime="audio/wav"
            )
        
        # Streaming playback controls
        st.subheader("Streaming Playback")
        if st.button("Stream Audio"):
            engine = get_tts_engine(lang_code='z')
            streaming_placeholder = st.empty()
            
            # Stream the audio in chunks
            for sample_rate, audio_chunk in engine.generate_speech_stream(
                chinese_text, 
                voice="zf_xiaobei"
            ):
                # Create a temporary file for each chunk
                temp_chunk_path = f"temp/outputs/chunk_{time.time()}.wav"
                import soundfile as sf
                sf.write(temp_chunk_path, audio_chunk, sample_rate)
                
                # Play the chunk
                with streaming_placeholder:
                    st.audio(temp_chunk_path, sample_rate=sample_rate)
                
                # Clean up the temporary chunk file
                os.remove(temp_chunk_path)

def initialize_session_state():
    """Initialize session state variables"""
    if 'current_text' not in st.session_state:
        st.session_state.current_text = None

def main():
    """Main application workflow"""
    logger.info("Starting application")
    configure_page()
    initialize_session_state()
    
    st.title("🎧 High-Quality Audio Translation System")
    st.markdown("Upload English Audio → Get Chinese Speech Output")

    # Voice selection in sidebar
    st.sidebar.header("TTS Settings")
    voice_options = {
        "Xiaobei (Female)": "zf_xiaobei",
        "Yunjian (Male)": "zm_yunjian",
    }
    selected_voice = st.sidebar.selectbox(
        "Select Voice",
        list(voice_options.keys()),
        format_func=lambda x: x
    )
    speed = st.sidebar.slider("Speech Speed", 0.5, 2.0, 1.0, 0.1)

    uploaded_file = st.file_uploader(
        "Select Audio File (MP3/WAV)",
        type=["mp3", "wav"],
        accept_multiple_files=False
    )

    if uploaded_file:
        logger.info(f"File uploaded: {uploaded_file.name}")
        upload_path = os.path.join("temp/uploads", uploaded_file.name)
        with open(upload_path, "wb") as f:
            f.write(uploaded_file.getbuffer())
        
        results = handle_file_processing(upload_path)
        if results:
            render_results(*results)

if __name__ == "__main__":
    main()