mirror of https://github.com/AlfredoSequeida/fvid
Add Cython and Password Support
This combines the password and Cython PRs into one.
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Theelgirl
GitHub
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commit
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227
fvid/fvid.py
227
fvid/fvid.py
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@ -1,35 +1,101 @@
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from bitstring import Bits, BitArray
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from magic import Magic
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import mimetypes
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from PIL import Image
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import glob
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from operator import sub
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import numpy as np
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from tqdm import tqdm
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import ffmpeg
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import binascii
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import argparse
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import sys
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import os
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import getpass
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import io
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import gzip
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import pickle
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from cryptography.hazmat.backends import default_backend
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from cryptography.hazmat.primitives import hashes
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from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
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from Crypto.Cipher import AES
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try:
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from fvid_cython import cy_get_bits_from_image as cy_gbfi
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except (ImportError, ModuleNotFoundError):
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use_cython = False
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else:
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use_cython = True
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DELIMITER = bin(int.from_bytes("HELLO MY NAME IS ALFREDO".encode(), "big"))
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FRAMES_DIR = "./fvid_frames/"
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SALT = '63929291bca3c602de64352a4d4bfe69'.encode() # It need be the same in one instance of coding/decoding
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DEFAULT_KEY = ' '*32
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DEFAULT_KEY = DEFAULT_KEY.encode()
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NOTDEBUG = True
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class WrongPassword(Exception):
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pass
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class MissingArgument(Exception):
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pass
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def get_password(password_provided):
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if password_provided=='default':
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return DEFAULT_KEY
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else:
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if password_provided == None:
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password_provided = getpass.getpass("Enter password:")
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password = str(password_provided).encode()
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kdf = PBKDF2HMAC(
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algorithm=hashes.SHA512(),
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length=32,
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salt=SALT,
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iterations=100000,
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backend=default_backend()
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)
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key = kdf.derive(password)
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return key
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def get_bits_from_file(filepath):
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def get_bits_from_file(filepath, key):
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print('Reading file...')
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bitarray = BitArray(filename=filepath)
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# adding a delimiter to know when the file ends to avoid corrupted files
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# when retrieving
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bitarray.append(DELIMITER)
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cipher = AES.new(key, AES.MODE_EAX, nonce=SALT)
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ciphertext, tag = cipher.encrypt_and_digest(bitarray.tobytes())
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filename = os.path.basename(filepath)
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pickled = pickle.dumps({'tag':tag,
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'data':ciphertext,
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'filename':filepath})
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print('Ziping...')
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#zip
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out = io.BytesIO()
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with gzip.GzipFile(fileobj=out, mode='w') as fo:
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fo.write(pickled)
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zip = out.getvalue()
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#zip
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del bitarray
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del pickled
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bitarray = BitArray(zip)
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return bitarray.bin
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def less(val1, val2):
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return val1 < val2
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def get_bits_from_image(image):
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if use_cython:
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bits = cy_gbfi(image)
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return bits, False
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width, height = image.size
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done = False
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@ -37,28 +103,13 @@ def get_bits_from_image(image):
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px = image.load()
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bits = ""
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delimiter_str = DELIMITER.replace("0b", "")
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delimiter_length = len(delimiter_str)
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pbar = tqdm(range(height), desc="Getting bits from frame")
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pbar = range(height)
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white = (255, 255, 255)
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black = (0, 0, 0)
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for y in pbar:
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for x in range(width):
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# check if we have hit the delimiter
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if bits[-delimiter_length:] == delimiter_str:
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# remove delimiter from bit data to have an exact one to one
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# copy when decoding
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bits = bits[: len(bits) - delimiter_length]
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pbar.close()
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return (bits, True)
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pixel = px[x, y]
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pixel_bin_rep = "0"
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@ -89,19 +140,19 @@ def get_bits_from_image(image):
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def get_bits_from_video(video_filepath):
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# get image sequence from video
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print('Reading video...')
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image_sequence = []
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ffmpeg.input(video_filepath).output(
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f"{FRAMES_DIR}decoded_frames%03d.png"
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).run(quiet=True)
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os.system('ffmpeg -i ' + video_filepath + ' ./fvid_frames/decoded_frames_%d.png');
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for filename in glob.glob(f"{FRAMES_DIR}decoded_frames*.png"):
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# for filename in glob.glob(f"{FRAMES_DIR}decoded_frames*.png"):
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for filename in sorted(glob.glob(f"{FRAMES_DIR}decoded_frames*.png"), key=os.path.getmtime) :
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image_sequence.append(Image.open(filename))
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bits = ""
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sequence_length = len(image_sequence)
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for index in range(sequence_length):
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print('Bits are in place')
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for index in tqdm(range(sequence_length)):
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b, done = get_bits_from_image(image_sequence[index])
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bits += b
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@ -112,20 +163,43 @@ def get_bits_from_video(video_filepath):
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return bits
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def save_bits_to_file(file_path, bits):
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def save_bits_to_file(file_path, bits, key):
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# get file extension
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bitstring = Bits(bin=bits)
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mime = Magic(mime=True)
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mime_type = mime.from_buffer(bitstring.tobytes())
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#zip
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print('Unziping...')
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in_ = io.BytesIO()
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in_.write(bitstring.bytes)
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in_.seek(0)
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with gzip.GzipFile(fileobj=in_, mode='rb') as fo:
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bitstring = fo.read()
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#zip
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unpickled = pickle.loads(bitstring)
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tag = unpickled['tag']
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ciphertext = unpickled['data']
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filename = unpickled['filename']
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cipher = AES.new(key, AES.MODE_EAX, nonce=SALT)
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bitstring = cipher.decrypt(ciphertext)
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print('Checking integrity...')
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try:
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cipher.verify(tag)
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except ValueError:
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raise WrongPassword("Key incorrect or message corrupted")
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bitstring = BitArray(bitstring)
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# If filepath not passed in use defualt
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# otherwise used passed in filepath
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if file_path == None:
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filepath = f"file{mimetypes.guess_extension(type=mime_type)}"
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filepath = filename
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else:
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filepath = file_path
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filepath = file_path # No need for mime Magic
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with open(
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filepath, "wb"
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@ -133,15 +207,6 @@ def save_bits_to_file(file_path, bits):
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bitstring.tofile(f)
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def make_image(bit_set, resolution=(1920, 1080)):
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width, height = resolution
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image = Image.new("1", (width, height))
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image.putdata(bit_set)
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return image
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def split_list_by_n(lst, n):
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for i in range(0, len(lst), n):
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@ -155,41 +220,41 @@ def make_image_sequence(bitstring, resolution=(1920, 1080)):
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set_size = width * height
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# bit_sequence = []
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bit_sequence = split_list_by_n(list(map(int, bitstring)), width * height)
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image_bits = []
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print('Making image sequence')
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print('Cutting...')
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#bitlist = list(tqdm(split_list_by_n(bitstring, set_size)))
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bitlist = list(split_list_by_n(bitstring, set_size))
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del bitstring
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bitlist[-1] = bitlist[-1] + '0'*(set_size - len(bitlist[-1]))
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# using bit_sequence to make image sequence
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index = 1
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bitlist = bitlist[::-1]
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print('Saving frames...')
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for _ in tqdm(range(len(bitlist))):
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bitl = bitlist.pop()
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# for bitl in tqdm(bitlist):
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# image_bits = list(map(int, tqdm(bitl)))
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image_bits = list(map(int, bitl))
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# print(image_bits)
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image_sequence = []
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for bit_set in bit_sequence:
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image_sequence.append(make_image(bit_set))
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return image_sequence
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image = Image.new("1", (width, height))
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image.putdata(image_bits)
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image.save(
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f"{FRAMES_DIR}encoded_frames_{index}.png"
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)
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index += 1
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def make_video(output_filepath, image_sequence, framerate="1/5"):
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def make_video(output_filepath, framerate="1/5"):
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if output_filepath == None:
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outputfile = "file.mp4"
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else:
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outputfile = output_filepath
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frames = glob.glob(f"{FRAMES_DIR}encoded_frames*.png")
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# for one frame
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if len(frames) == 1:
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ffmpeg.input(frames[0], loop=1, t=1).output(
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outputfile, vcodec="libx264rgb"
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).run(quiet=True)
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else:
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ffmpeg.input(
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f"{FRAMES_DIR}encoded_frames*.png",
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pattern_type="glob",
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framerate=framerate,
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).output(outputfile, vcodec="libx264rgb").run(quiet=True)
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os.system('ffmpeg -r ' + framerate + ' -i ./fvid_frames/encoded_frames_%d.png -c:v libx264rgb ' + outputfile)
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@ -219,11 +284,20 @@ def main():
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parser.add_argument("-i", "--input", help="input file", required=True)
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parser.add_argument("-o", "--output", help="output path")
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parser.add_argument("-f", "--framerate", help="set framerate for encoding (as a fraction)", default="1/5", type=str)
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parser.add_argument("-p", "--password", help="set password", nargs="?", type=str, default='default')
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args = parser.parse_args()
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setup()
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if not NOTDEBUG:
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print('args', args)
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print('PASSWORD', args.password, [len(args.password) if len(args.password) is not None else None for _ in range(0)])
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if not args.decode and not args.encode:
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raise MissingArgument('You should use either --encode or --decode!') #check for arguments
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key = get_password(args.password)
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if args.decode:
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bits = get_bits_from_video(args.input)
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@ -232,7 +306,7 @@ def main():
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if args.output:
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file_path = args.output
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save_bits_to_file(file_path, bits)
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save_bits_to_file(file_path, bits, key)
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elif args.encode:
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# isdigit has the benefit of being True and raising an error if the user passes a negative string
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@ -240,22 +314,17 @@ def main():
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if (not args.framerate.isdigit() and "/" not in args.framerate) or all(x in args.framerate for x in ("-", "/")):
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raise NotImplementedError("The framerate must be a positive fraction or an integer for now, like 3, '1/3', or '1/5'!")
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# get bits from file
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bits = get_bits_from_file(args.input)
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bits = get_bits_from_file(args.input, key)
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# create image sequence
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image_sequence = make_image_sequence(bits)
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make_image_sequence(bits)
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# save images
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for index in range(len(image_sequence)):
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image_sequence[index].save(
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f"{FRAMES_DIR}encoded_frames_{index}.png"
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)
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video_file_path = None
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if args.output:
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video_file_path = args.output
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make_video(video_file_path, image_sequence, args.framerate)
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make_video(video_file_path, args.framerate)
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cleanup()
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