app.py

import numpy as np
import re
import concurrent.futures
import gradio as gr
from datetime import datetime
import random
import moviepy
from transformers import pipeline
from transformers.pipelines.audio_utils import ffmpeg_read
from moviepy import (
    VideoFileClip,
    TextClip, 
    CompositeVideoClip,
    CompositeAudioClip,
    AudioFileClip,
    concatenate_videoclips,
    concatenate_audioclips
)
from moviepy.audio.AudioClip import AudioArrayClip
from gtts import gTTS
import subprocess
import speech_recognition as sr
import json
from nltk.tokenize import sent_tokenize
import logging
from textblob import TextBlob
import whisper
import time
import os
import openai 
from openai import OpenAI 

client = OpenAI(
    api_key= os.environ.get("openAI_api_key"),  # This is the default and can be omitted
)

def silence(duration, fps=44100):
    """
    Returns a silent AudioClip of the specified duration.
    """
    return AudioArrayClip(np.zeros((int(fps*duration), 2)), fps=fps)

def count_words_or_characters(text):
    # Count non-Chinese words
    non_chinese_words = len(re.findall(r'\b[a-zA-Z0-9]+\b', text))
    
    # Count Chinese characters
    chinese_chars = len(re.findall(r'[\u4e00-\u9fff]', text))
    
    return non_chinese_words + chinese_chars
    
# Define the passcode
PASSCODE = "show_feedback_db"

css = """
/* Adjust row height */
.dataframe-container tr {
    height: 50px !important; 
}

/* Ensure text wrapping and prevent overflow */
.dataframe-container td {
    white-space: normal !important; 
    word-break: break-word !important;
}

/* Set column widths */
[data-testid="block-container"] .scrolling-dataframe th:nth-child(1), 
[data-testid="block-container"] .scrolling-dataframe td:nth-child(1) {
    width: 6%; /* Start column */
}

[data-testid="block-container"] .scrolling-dataframe th:nth-child(2), 
[data-testid="block-container"] .scrolling-dataframe td:nth-child(2) {
    width: 47%; /* Original text */
}

[data-testid="block-container"] .scrolling-dataframe th:nth-child(3), 
[data-testid="block-container"] .scrolling-dataframe td:nth-child(3) {
    width: 47%; /* Translated text */
}

[data-testid="block-container"] .scrolling-dataframe th:nth-child(4), 
[data-testid="block-container"] .scrolling-dataframe td:nth-child(4) {
    display: none !important;
}
"""

# Function to save feedback or provide access to the database file
def handle_feedback(feedback):
    feedback = feedback.strip()  # Clean up leading/trailing whitespace
    if not feedback:
        return "Feedback cannot be empty.", None

    if feedback == PASSCODE:
        # Provide access to the feedback.db file
        return "Access granted! Download the database file below.", "feedback.db"
    else:
        # Save feedback to the database
        with sqlite3.connect("feedback.db") as conn:
            cursor = conn.cursor()
            cursor.execute("CREATE TABLE IF NOT EXISTS studio_feedback (id INTEGER PRIMARY KEY, comment TEXT)")
            cursor.execute("INSERT INTO studio_feedback (comment) VALUES (?)", (feedback,))
            conn.commit()
        return "Thank you for your feedback!", None

# Configure logging
logging.basicConfig(level=logging.DEBUG, format="%(asctime)s - %(levelname)s - %(message)s")
logger = logging.getLogger(__name__)
logger.info(f"MoviePy Version: {moviepy.__version__}")

def transcribe_video(video_path):
    # Load the video file and extract audio
    video = VideoFileClip(video_path)
    audio_path = "audio.wav"
    video.audio.write_audiofile(audio_path)
    
    # Load Whisper model
    model = whisper.load_model("large")  # Options: tiny, base, small, medium, large

    # Transcribe with Whisper
    result = model.transcribe(audio_path, word_timestamps=True)
    
    # Extract timestamps, text, and compute word count
    total_words = 0
    total_duration = 0
    transcript_with_timestamps = []
    
    for segment in result["segments"]:
        start = segment["start"]
        end = segment["end"]
        text = segment["text"]

        transcript_with_timestamps.append({
            "start": start,
            "end": end,
            "text": text
        })

        word_count = count_words_or_characters(text)
        total_words += word_count
        total_duration += (end - start)
    
    # Compute average words per second
    avg_words_per_second = total_words / total_duration if total_duration > 0 else 0
    
    # Add total statistics to the result
    transcript_stats = {
        "total_words": total_words,
        "total_duration": total_duration,
        "avg_words_per_second": avg_words_per_second
    }
    logger.debug(f"Transcription stats:\n{transcript_stats}")
    # Get the detected language
    detected_language = result["language"]
    logger.debug(f"Detected language:\n{detected_language}")
    return transcript_with_timestamps, detected_language

# Function to get the appropriate translation model based on target language
def get_translation_model(source_language, target_language):
    """
    Get the translation model based on the source and target language.

    Parameters:
    - target_language (str): The language to translate the content into (e.g., 'es', 'fr').
    - source_language (str): The language of the input content (default is 'en' for English).
    
    Returns:
    - str: The translation model identifier.
    """
    # List of allowable languages
    allowable_languages = ["en", "es", "fr", "zh", "de", "it", "pt", "ja", "ko", "ru"]

    # Validate source and target languages
    if source_language not in allowable_languages:
        logger.debug(f"Invalid source language '{source_language}'. Supported languages are: {', '.join(allowable_languages)}")
        # Return a default model if source language is invalid
        source_language = "en"  # Default to 'en'

    if target_language not in allowable_languages:
        logger.debug(f"Invalid target language '{target_language}'. Supported languages are: {', '.join(allowable_languages)}")
        # Return a default model if target language is invalid
        target_language = "zh"  # Default to 'zh'

    if source_language == target_language:
        source_language = "en"  # Default to 'en'
        target_language = "zh"  # Default to 'zh'

    # Return the model using string concatenation
    return f"Helsinki-NLP/opus-mt-{source_language}-{target_language}"

def translate_single_entry(entry, translator):
    original_text = entry["text"]
    translated_text = translator(original_text)[0]['translation_text']
    return {
        "start": entry["start"],
        "original": original_text,
        "translated": translated_text,
        "end": entry["end"]
    }

def translate_text(transcription_json, source_language, target_language):
    # Load the translation model for the specified target language
    translation_model_id = get_translation_model(source_language, target_language)
    logger.debug(f"Translation model: {translation_model_id}")
    translator = pipeline("translation", model=translation_model_id)

    # Use ThreadPoolExecutor to parallelize translations
    with concurrent.futures.ThreadPoolExecutor() as executor:
        # Submit all translation tasks and collect results
        translate_func = lambda entry: translate_single_entry(entry, translator)
        translated_json = list(executor.map(translate_func, transcription_json))

    # Sort the translated_json by start time
    translated_json.sort(key=lambda x: x["start"])

    # Log the components being added to translated_json
    for entry in translated_json:
        logger.debug("Added to translated_json: start=%s, original=%s, translated=%s, end=%s",
                     entry["start"], entry["original"], entry["translated"], entry["end"])

    return translated_json

def update_translations(file, edited_table, mode):
    """
    Update the translations based on user edits in the Gradio Dataframe.
    """
    output_video_path = "output_video.mp4"
    logger.debug(f"Editable Table: {edited_table}")

    if file is None:
        logger.info("No file uploaded. Please upload a video/audio file.")
        return None, [], None, "No file uploaded. Please upload a video/audio file."
        
    try:
        start_time = time.time()  # Start the timer

        # Convert the edited_table (list of lists) back to list of dictionaries
        updated_translations = [
            {
                "start": row["start"],  # Access by column name
                "original": row["original"],
                "translated": row["translated"],
                "end": row["end"]
            }
            for _, row in edited_table.iterrows()
        ]

        # Call the function to process the video with updated translations
        add_transcript_voiceover(file.name, updated_translations, output_video_path, mode=="Transcription with Voiceover")

        # Calculate elapsed time
        elapsed_time = time.time() - start_time
        elapsed_time_display = f"Updates applied successfully in {elapsed_time:.2f} seconds."

        return output_video_path, elapsed_time_display

    except Exception as e:
        raise ValueError(f"Error updating translations: {e}")

def process_entry(entry, i, video_width, video_height, add_voiceover, target_language):
    logger.debug(f"Processing entry {i}: {entry}")

    # Create text clip for subtitles
    txt_clip = TextClip(
        text=entry["translated"],
        font="./NotoSansSC-Regular.ttf",
        method='caption',
        color='yellow',
        stroke_color='black',  # Border color
        stroke_width=2,  # Border thickness
        font_size=int(video_height // 20),
        size=(int(video_width * 0.8), None)
    ).with_start(entry["start"]).with_duration(entry["end"] - entry["start"]).with_position(('bottom')).with_opacity(0.8)

    audio_segment = None
    if add_voiceover:
        segment_audio_path = f"segment_{i}_voiceover.wav"
        desired_duration = entry["end"] - entry["start"]
        generate_voiceover_OpenAI([entry], target_language, desired_duration, segment_audio_path)
        audio_clip = AudioFileClip(segment_audio_path)
        # Get and log all methods in AudioFileClip        
        logger.info("Methods in AudioFileClip:")
        for method in dir(audio_clip):
            logger.info(method)
        
        # Log duration of the audio clip and the desired duration for debugging.
        logger.debug(f"Audio clip duration: {audio_clip.duration}, Desired duration: {desired_duration}")

        if audio_clip.duration < desired_duration:
            # Pad with silence if audio is too short
            silence_duration = desired_duration - audio_clip.duration

            # Concatenate the original audio and silence
            audio_clip = concatenate_audioclips([audio_clip, silence(duration=silence_duration)])
            logger.info(f"Padded audio with {silence_duration} seconds of silence.")
        
        # Set the audio_segment to the required duration.
        audio_segment = audio_clip.with_start(entry["start"]).with_duration(desired_duration)

    return i, txt_clip, audio_segment

def add_transcript_voiceover(video_path, translated_json, output_path, add_voiceover=False, target_language="en"):
    """
    Add transcript and voiceover to a video, segment by segment.
    """
    video = VideoFileClip(video_path)
    font_path = "./NotoSansSC-Regular.ttf"

    text_clips = []
    audio_segments = []

    with concurrent.futures.ThreadPoolExecutor() as executor:
        futures = [executor.submit(process_entry, entry, i, video.w, video.h, add_voiceover, target_language) 
                   for i, entry in enumerate(translated_json)]

        # Collect results with original index i
        results = []
        for future in concurrent.futures.as_completed(futures):
            try:
                i, txt_clip, audio_segment = future.result()
                results.append((i, txt_clip, audio_segment))
            except Exception as e:
                logger.error(f"Error processing entry: {e}")
                
    # Sort by original index i
    results.sort(key=lambda x: x[0])
    
    # Extract sorted clips
    text_clips = [clip for i, clip, segment in results]

    final_video = CompositeVideoClip([video] + text_clips)

    logger.info("Methods in CompositeVideoClip:")
    for method in dir(final_video):
        logger.info(method)
    
    if add_voiceover:
        audio_segments = [segment for i, clip, segment in results if segment is not None]
        final_audio = CompositeAudioClip(audio_segments)  # Critical fix
        final_audio = final_audio.with_duration(video.duration)

        final_video = final_video.with_audio(final_audio)

    logger.info(f"Saving the final video to: {output_path}")
    final_video.write_videofile(output_path, codec="libx264", audio_codec="aac")

    logger.info("Video processing completed successfully.")

def generate_voiceover(translated_json, language, output_audio_path):
    """
    Generate voiceover from translated text for a given language.
    """
    # Concatenate translated text into a single string
    full_text = " ".join(entry["translated"] for entry in translated_json)

    try:
        tts = gTTS(text=full_text, lang=language)
        time.sleep(10)  # Add a delay of 10 seconds between requests
        tts.save(output_audio_path)
    except Exception as e:
        raise ValueError(f"Error generating voiceover: {e}")

def truncated_linear(x):
    if x < 15:
        return 1
    elif x > 25:
        return 1.3
    else:
        slope = (1.3 - 1) / (25 - 15)
        return 1 + slope * (x - 15)

def calculate_speed(text, desired_duration):
    # Calculate characters per second
    char_count = len(text)
    chars_per_second = char_count / (desired_duration + 0.001)
    
    # Apply truncated linear function to get speed
    speed = truncated_linear(chars_per_second)
    
    return speed

def generate_voiceover_OpenAI(translated_json, language, desired_duration, output_audio_path):
    """
    Generate voiceover from translated text for a given language using OpenAI TTS API.
    """
    # Concatenate translated text into a single string
    full_text = " ".join(entry["translated"] for entry in translated_json)

    # Define the voice based on the language (for now, use 'alloy' as default)
    voice = "alloy"  # Adjust based on language if needed

    # Define the model (use tts-1 for real-time applications)
    model = "tts-1"

    max_retries = 3
    retry_count = 0

    while retry_count < max_retries:
        try:
            speed_tts = calculate_speed(full_text, desired_duration)
            # Create the speech using OpenAI TTS API
            response = client.audio.speech.create(
                model=model,
                voice=voice,
                input=full_text,
                speed=speed_tts
            )
            # Save the audio to the specified path
            with open(output_audio_path, 'wb') as f:
                for chunk in response.iter_bytes():
                    f.write(chunk)
            logging.info(f"Voiceover generated successfully for {output_audio_path}")
            break

        except Exception as e:
            retry_count += 1
            logging.error(f"Error generating voiceover (retry {retry_count}/{max_retries}): {e}")
            time.sleep(5)  # Wait 5 seconds before retrying

    if retry_count == max_retries:
        raise ValueError(f"Failed to generate voiceover after {max_retries} retries.")

def upload_and_manage(file, target_language, mode="transcription"):
    if file is None:
        logger.info("No file uploaded. Please upload a video/audio file.")
        return None, [], None, "No file uploaded. Please upload a video/audio file."

    try:
        start_time = time.time()  # Start the timer
        logger.info(f"Started processing file: {file.name}")

        # Define paths for audio and output files
        audio_path = "audio.wav"
        output_video_path = "output_video.mp4"
        voiceover_path = "voiceover.wav"
        logger.info(f"Using audio path: {audio_path}, output video path: {output_video_path}, voiceover path: {voiceover_path}")

        # Step 1: Transcribe audio from uploaded media file and get timestamps
        logger.info("Transcribing audio...")
        transcription_json, source_language = transcribe_video(file.name)
        logger.info(f"Transcription completed. Detected source language: {source_language}")

        # Step 2: Translate the transcription
        logger.info(f"Translating transcription from {source_language} to {target_language}...")
        translated_json = translate_text(transcription_json, source_language, target_language)
        logger.info(f"Translation completed. Number of translated segments: {len(translated_json)}")

        # Step 3: Add transcript to video based on timestamps
        logger.info("Adding translated transcript to video...")
        add_transcript_voiceover(file.name, translated_json, output_video_path, mode == "Transcription with Voiceover", target_language)
        logger.info(f"Transcript added to video. Output video saved at {output_video_path}")

        # Convert translated JSON into a format for the editable table
        logger.info("Converting translated JSON into editable table format...")
        editable_table = [
            [float(entry["start"]), entry["original"], entry["translated"], float(entry["end"])]
            for entry in translated_json
        ]

        # Calculate elapsed time
        elapsed_time = time.time() - start_time
        elapsed_time_display = f"Processing completed in {elapsed_time:.2f} seconds."
        logger.info(f"Processing completed in {elapsed_time:.2f} seconds.")

        return translated_json, editable_table, output_video_path, elapsed_time_display

    except Exception as e:
        logger.error(f"An error occurred: {str(e)}")
        return None, [], None, f"An error occurred: {str(e)}"
# Gradio Interface with Tabs
def build_interface():
    with gr.Blocks(css=css) as demo:
        gr.Markdown("## Video Localization")
        with gr.Row():
            with gr.Column(scale=4):
                file_input = gr.File(label="Upload Video/Audio File")
                language_input = gr.Dropdown(["en", "es", "fr", "zh"], label="Select Language")  # Language codes
                process_mode = gr.Radio(choices=["Transcription", "Transcription with Voiceover"], label="Choose Processing Type", value="Transcription")
                submit_button = gr.Button("Post and Process")
                editable_translations = gr.State(value=[])

            with gr.Column(scale=8):
                gr.Markdown("## Edit Translations")
                
                # Editable JSON Data
                editable_table = gr.Dataframe(
                    value=[],  # Default to an empty list to avoid undefined values
                    headers=["start", "original", "translated", "end"],
                    datatype=["number", "str", "str", "number"],
                    row_count=1,  # Initially empty
                    col_count=4,
                    interactive=[False, True, True, False],  # Control editability
                    label="Edit Translations",
                    wrap=True  # Enables text wrapping if supported
                )
                save_changes_button = gr.Button("Save Changes")
                processed_video_output = gr.File(label="Download Processed Video", interactive=True)  # Download button
                elapsed_time_display = gr.Textbox(label="Elapsed Time", lines=1, interactive=False)

            with gr.Column(scale=1):
                gr.Markdown("**Feedback**")
                feedback_input = gr.Textbox(
                    placeholder="Leave your feedback here...",
                    label=None,
                    lines=3,
                )
                feedback_btn = gr.Button("Submit Feedback")
                response_message = gr.Textbox(label=None, lines=1, interactive=False)
                db_download = gr.File(label="Download Database File", visible=False)
            
                # Link the feedback handling
                def feedback_submission(feedback):
                    message, file_path = handle_feedback(feedback)
                    if file_path:
                        return message, gr.update(value=file_path, visible=True)
                    return message, gr.update(visible=False)            

            save_changes_button.click(
                update_translations, 
                inputs=[file_input, editable_table, process_mode], 
                outputs=[processed_video_output, elapsed_time_display]
            )

            submit_button.click(
                upload_and_manage, 
                inputs=[file_input, language_input, process_mode], 
                outputs=[editable_translations, editable_table, processed_video_output, elapsed_time_display]
            )

            # Connect submit button to save_feedback_db function
            feedback_btn.click(
                feedback_submission, 
                inputs=[feedback_input], 
                outputs=[response_message, db_download]
            )

    return demo

# Launch the Gradio interface
demo = build_interface()
demo.launch()