helperfunctions.py

import os
import time
import uuid
import hashlib
import subprocess


def generate_uuid(user_ip, url):
    """
    Generates a uuid based on User IP, URL & timestamp
    """
    # Converting User IP to bytes and Hashing it using SHA-1
    user_ip_bytes = user_ip.encode('utf-8')
    hashed_user_ip = hashlib.sha1(user_ip_bytes).hexdigest()
    
    # Converting URL to bytes and Hashing it using SHA-1
    url_bytes = url.encode('utf-8')
    hashed_url = hashlib.sha1(url_bytes).hexdigest()

    # Combining Hashed User IP, URL and Current Timestamp to Create a Unique Identifier
    unique_id = f"{hashed_user_ip}-{hashed_url}-{int(time.time())}"

    # Generate a UUID from the Unique Identifier
    uuid_value = uuid.uuid5(uuid.NAMESPACE_URL, unique_id)
    return str(uuid_value)

def extract_audio(video_path):
    """
    Extract audio from a video file (MP4 or WebM) and save it as an MP3 file using ffmpeg.

    Args:
        video_path (str): Path to the input video file.

    Returns:
        str: Path of extracted audio.
    """
    try:
        # Path for Extracted Audio File
        filename, extension = os.path.splitext(video_path)
        audio_path = filename + '.mp3'

        # Choosing the Appropriate Codec for the Output Audio Format (MP3)
        audio_codec = "libmp3lame" if extension.lower() in (".mp4", ".webm") else "mp3"

        # Extracting Audio using FFMPEG Command
        command = ["ffmpeg", "-i", video_path, "-vn", "-acodec", 
                    audio_codec, audio_path, '-loglevel', 'quiet']
        subprocess.run(command, check=True)
        
        return audio_path
    
    except Exception as e:
        print(f"Error in extract_audio: {e}")

def burn_subtitles(video_file_path, subtitle_file_path):
    '''
    Burns the subtitles onto the video

    Args:
        video_file_path (str): Path to the input video file.
        subtitle_file_path (str): Path to the subtitle file.

    Returns:
        str: Path of output video with subtitles.
    '''
    try:
        # Getting Output File Path
        video_filename, video_extension = os.path.splitext(video_file_path)
        subtitle_filename, subtitle_extension = os.path.splitext(subtitle_file_path)
        output_file_path = video_filename + subtitle_extension.replace('.', '_') + video_extension

        # Burning the Subtitles onto Video using FFMPEG Command
        command = ['ffmpeg', '-i', video_file_path, 
                '-vf', f'subtitles={subtitle_file_path}',
                output_file_path, '-loglevel', 'quiet']
        subprocess.run(command, check=True)

        return output_file_path
        
    except Exception as e:
        print(f"Error in burn_subtitles: {e}")

def convert_to_srt_time_format(seconds):
    '''
    Converts seconds into .srt format
    '''
    try:
        hours = seconds // 3600
        seconds %= 3600
        minutes = seconds // 60
        seconds %= 60
        milliseconds = int((seconds - int(seconds)) * 1000)
        return f"{int(hours):02d}:{int(minutes):02d}:{int(seconds):02d},{milliseconds:03d}"
    
    except Exception as e:
        print(f"Error in save_translated_subtitles: {e}")

def save_translated_subtitles(subtitles, media_path):
    '''
    Saves the translated subtitles into .srt file
    '''
    try:
        # Converting to SRT Format
        srt_content = ""
        counter = 1
        for subtitle in subtitles:
            start_time = subtitle['start']
            end_time = subtitle['end']
            text = subtitle['text']
            
            srt_content += f"{counter}\n"
            srt_content += f"{convert_to_srt_time_format(start_time)} --> {convert_to_srt_time_format(end_time)}\n"
            srt_content += f"{text}\n\n"
            
            counter += 1
        
        # Saving SRT content to a .srt file
        subtitles_filename = os.path.splitext(media_path)[0]
        subtitles_filename = f'{subtitles_filename}.srt'
        with open(subtitles_filename, 'w', encoding='utf-8') as srt_file:
            srt_file.write(srt_content)

        return subtitles_filename
    
    except Exception as e:
        print(f"Error in save_translated_subtitles: {e}")

def convert_audio(input_file, audio_format, audio_quality):
    '''
    Converts the audio according to the given audio parameters
    '''
    try:
        # Getting Output File Path
        output_file = f"{input_file.rsplit('.', 1)[0]}_converted.{audio_format}"

        # Running the command using Subprocess
        command = [
            'ffmpeg', '-i', input_file,
            '-b:a', audio_quality[:-3], output_file, 
            '-loglevel', 'quiet'
        ]
        subprocess.run(command)
    
    except Exception as e:
        print(f"Error in convert_audio: {e}")