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fvid
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Add H265 and Zfec

This commit is contained in:
Theelgirl 2021-02-25 10:52:28 -08:00
parent 2726bf9489
commit c99c8858ee
1 changed files with 204 additions and 53 deletions
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257
fvid/fvid.py
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@ -11,6 +11,11 @@ import io
import gzip
import json
import base64
import decimal
import random
import magic
from zfec import easyfec as ef
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes
@ -18,7 +23,7 @@ from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
from Crypto.Cipher import AES
try:
from fvid_cython import cy_get_bits_from_image as cy_gbfi
from fvid_cython import cy_gbfi, cy_gbfi_h265
use_cython = True
except (ImportError, ModuleNotFoundError):
@ -34,6 +39,15 @@ NOTDEBUG = True
TEMPVIDEO = "_temp.mp4"
FRAMERATE = "1"
# DO NOT CHANGE: (2, 3-8) works sometimes
# this is the most effieicnt by far though
KVAL = 4
MVAL = 5
# this can by ANY integer that is a multiple of (KVAL/MVAL)
# but it MUST stay the same between encoding/decoding
# reccomended 8-64
BLOCK = 16
class WrongPassword(Exception):
pass
@ -67,21 +81,51 @@ def get_password(password_provided: str) -> bytes:
key = kdf.derive(password)
return key
def get_bits_from_file(filepath: str, key: bytes) -> BitArray:
def encode_zfec(bit_array: BitArray) -> BitArray:
global KVAL, MVAL, BLOCK
"""
Get/read bits from file
Apply Reed-Solomon error correction every byte to maximize retrieval
possibility as opposed to applying it to the entire file
bit_array -- BitArray containing raw file data
ecc -- The error correction value to be used (default DEFAULT_ECC)
"""
bits = bit_array.bin
# split bits into blocks of bits
byte_list = split_string_by_n(bits, BLOCK)
ecc_bytes = ""
print("Applying Zfec Error Correction...")
encoder = ef.Encoder(KVAL, MVAL)
for b in tqdm(byte_list):
ecc_bytes += ''.join(map(bytes.decode, encoder.encode(b.encode('utf-8'))))
return BitArray(bytes=ecc_bytes.encode('utf-8'))
def get_bits_from_file(
filepath: str, key: bytes, zfec: bool
) -> BitArray:
"""
Get/read bits fom file, encrypt data, and zip
filepath -- the file to read
key -- key used to encrypt file
zfec -- if reed solomon should be used to encode bits
"""
print("Reading file...")
bitarray = BitArray(filename=filepath)
# adding a delimiter to know when the file ends to avoid corrupted files
# when retrieving
if zfec:
bitarray = encode_zfec(bitarray)
# encrypt data
cipher = AES.new(key, AES.MODE_EAX, nonce=SALT)
ciphertext, tag = cipher.encrypt_and_digest(bitarray.tobytes())
@ -89,6 +133,7 @@ def get_bits_from_file(filepath: str, key: bytes) -> BitArray:
# because json can only serialize strings, the byte objects are encoded
# using base64
data_bytes = json.dumps(
{
"tag": base64.b64encode(tag).decode("utf-8"),
@ -97,7 +142,7 @@ def get_bits_from_file(filepath: str, key: bytes) -> BitArray:
}
).encode("utf-8")
print("Zipping...")
# print("Zipping...")
# zip
out = io.BytesIO()
@ -109,49 +154,64 @@ def get_bits_from_file(filepath: str, key: bytes) -> BitArray:
del bitarray
bitarray = BitArray(zip)
# bitarray = BitArray(data_bytes)
return bitarray.bin
def get_bits_from_image(image: Image) -> str:
def get_bits_from_image(image: Image, use_h265: bool) -> str:
"""
extract bits from image (frame) pixels
image -- png image file used to extract bits from
"""
if use_cython:
bits = cy_gbfi(image)
return bits
# use two different functions so we can type pixel correctly
if use_cython and not use_h265:
return cy_gbfi(image)
elif use_cython and use_h265:
return cy_gbfi_h265(image)
width, height = image.size
px = image.load()
bits = ""
for y in range(height):
for x in range(width):
# use separate code path so we dont check inside every loop
if not use_h265:
for y in range(height):
for x in range(width):
pixel = px[x, y]
pixel_bin_rep = "0"
pixel = px[x, y]
# if the white difference is smaller, that means the pixel is
# closer to white, otherwise, the pixel must be black
if (
abs(pixel[0] - 255) < abs(pixel[0] - 0)
and abs(pixel[1] - 255) < abs(pixel[1] - 0)
and abs(pixel[2] - 255) < abs(pixel[2] - 0)
):
pixel_bin_rep = "1"
pixel_bin_rep = "0"
# adding bits
bits += pixel_bin_rep
else:
for y in range(height):
for x in range(width):
pixel = px[x, y]
pixel_bin_rep = "0"
# if the white difference is smaller, that means the pixel is
# closer to white, otherwise, the pixel must be black
if (
abs(pixel[0] - 255) < abs(pixel[0] - 0)
and abs(pixel[1] - 255) < abs(pixel[1] - 0)
and abs(pixel[2] - 255) < abs(pixel[2] - 0)
):
pixel_bin_rep = "1"
# pixel is either 0 or 255, black or white
if pixel == 255:
pixel_bin_rep = "1"
# adding bits
bits += pixel_bin_rep
# adding bits
bits += pixel_bin_rep
return bits
def get_bits_from_video(video_filepath: str) -> str:
def get_bits_from_video(video_filepath: str, use_h265: bool) -> str:
"""
extract the bits from a video by frame (using a sequence of images)
@ -161,14 +221,24 @@ def get_bits_from_video(video_filepath: str) -> str:
print("Reading video...")
image_sequence = []
os.system(
"ffmpeg -i "
+ video_filepath
+ " -c:v libx264rgb -filter:v fps=fps="
+ FRAMERATE
+ " "
+ TEMPVIDEO
)
if use_h265:
os.system(
"ffmpeg -i "
+ video_filepath
+ " -c:v libx265 -filter:v fps=fps="
+ FRAMERATE
+ " -x265-params lossless=1 -preset 6 -tune grain "
+ TEMPVIDEO
)
else:
os.system(
"ffmpeg -i "
+ video_filepath
+ " -c:v libx264rgb -filter:v fps=fps="
+ FRAMERATE
+ " "
+ TEMPVIDEO
)
os.system(
"ffmpeg -i " + TEMPVIDEO + " ./fvid_frames/decoded_frames_%d.png"
)
@ -185,19 +255,59 @@ def get_bits_from_video(video_filepath: str) -> str:
if use_cython:
print("Using Cython...")
for index in tqdm(range(sequence_length)):
bits += get_bits_from_image(image_sequence[index])
bits += get_bits_from_image(image_sequence[index], use_h265)
return bits
def save_bits_to_file(file_path: str, bits: str, key: bytes):
def decode_zfec(data_bytes: bytes) -> bytes:
global KVAL, MVAL, BLOCK
byte_list = split_string_by_n(data_bytes, int(BLOCK*(MVAL/KVAL)))
# appending to a single bytes object is very slow so we make 50-51 and combine at the end
decoded_bytes = [bytes()] * (int(len(byte_list) / 50) + 1)
print("Decoding Zfec Error Correction...")
decoder = ef.Decoder(KVAL, MVAL)
i = 0
for b in tqdm(byte_list):
base = split_string_by_n(b, len(b) // MVAL)
decoded_str_1 = decoder.decode(base[:KVAL], list(range(KVAL)), 0)
decoded_str_2 = decoder.decode(base[1:KVAL+1], list(range(KVAL+1))[1:], 0)
if decoded_str_1 == decoded_str_2:
decoded_bytes[i//50] += decoded_str_1
else: # its corrupted here
j = 10
while j > 0 and decoded_str_1 != decoded_str_2:
random.shuffle(base)
decoded_str_1 = decoder.decode(base[:KVAL], list(range(KVAL)), 0)
decoded_str_2 = decoder.decode(base[1:KVAL+1], list(range(KVAL+1))[1:], 0)
j -= 1
decoded_bytes[i//50] += decoded_str_1 # it should be correct by now
i += 1
decoded_bytestring = bytes()
for bytestring in tqdm(decoded_bytes):
decoded_bytestring += bytestring
return decoded_bytestring
def save_bits_to_file(
file_path: str, bits: str, key: bytes, zfec: bool
):
"""
save/write bits to a file
file_path -- the path to write to
bits -- the bits to write
key -- key userd for file decryption
zfec -- needed if reed solomon was used to encode bits
"""
bitstring = Bits(bin=bits)
@ -207,6 +317,9 @@ def save_bits_to_file(file_path: str, bits: str, key: bytes):
in_ = io.BytesIO()
in_.write(bitstring.bytes)
in_.seek(0)
# DOES NOT WORK IF WE DONT CHECK BUFFER, UNSURE WHY
filetype = magic.from_buffer(in_.read())
in_.seek(0)
with gzip.GzipFile(fileobj=in_, mode="rb") as fo:
bitstring = fo.read()
# zip
@ -220,8 +333,9 @@ def save_bits_to_file(file_path: str, bits: str, key: bytes):
filename = data["filename"]
# decrypting data
cipher = AES.new(key, AES.MODE_EAX, nonce=SALT)
bitstring = cipher.decrypt(ciphertext)
data_bytes = cipher.decrypt(ciphertext)
print("Checking integrity...")
@ -230,7 +344,12 @@ def save_bits_to_file(file_path: str, bits: str, key: bytes):
except ValueError:
raise WrongPassword("Key incorrect or message corrupted")
bitstring = BitArray(bitstring)
bitstring = Bits(data_bytes)
if zfec:
bitstring = Bits(
"0b" + decode_zfec(data_bytes).decode("utf-8")
)
# If filepath not passed in use default otherwise used passed in filepath
if file_path == None:
@ -286,11 +405,12 @@ def make_image_sequence(bitstring: BitArray, resolution: tuple = (1920, 1080)):
index = 1
bitlist = bitlist[::-1]
print("Saving frames...")
for _ in tqdm(range(len(bitlist))):
bitl = bitlist.pop()
image_bits = list(map(int, bitl))
# print(image_bits)
image = Image.new("1", (width, height))
image.putdata(image_bits)
@ -298,7 +418,7 @@ def make_image_sequence(bitstring: BitArray, resolution: tuple = (1920, 1080)):
index += 1
def make_video(output_filepath: str, framerate: int = FRAMERATE):
def make_video(output_filepath: str, framerate: int = FRAMERATE, use_h265: bool = False):
"""
Create video using ffmpeg
@ -311,13 +431,21 @@ def make_video(output_filepath: str, framerate: int = FRAMERATE):
else:
outputfile = output_filepath
os.system(
"ffmpeg -r "
+ framerate
+ " -i ./fvid_frames/encoded_frames_%d.png -c:v libx264rgb "
+ outputfile
)
if use_h265:
os.system(
"ffmpeg -r "
+ framerate
+ " -i ./fvid_frames/encoded_frames_%d.png -c:v libx265 "
+ " -x265-params lossless=1 -preset 6 -tune grain "
+ outputfile
)
else:
os.system(
"ffmpeg -r "
+ framerate
+ " -i ./fvid_frames/encoded_frames_%d.png -c:v libx264rgb "
+ outputfile
)
def cleanup():
"""
@ -336,7 +464,6 @@ def setup():
if not os.path.exists(FRAMES_DIR):
os.makedirs(FRAMES_DIR)
def main():
global FRAMERATE
parser = argparse.ArgumentParser(description="save files as videos")
@ -364,6 +491,27 @@ def main():
type=str,
default="default",
)
parser.add_argument(
"-z",
"--zfec",
help=(
"Apply Zfec error correcting. This is helpful if you're"
" finding that your data is not being decoded correctly. It adds"
" 2 extra bits per byte making it possible to recover all 8 bits"
" in the case the data changes during the decoding process at"
" the cost of making your video files larger. Note, if you use"
" this option, you must also use the -r flag to decode a video"
" back to a file, otherwise, your data will not be recovered"
" correctly."
),
action="store_true",
)
parser.add_argument(
"-5",
"--h265",
help="Use H.265 codec for improved efficiency",
action="store_true",
)
args = parser.parse_args()
@ -391,14 +539,14 @@ def main():
key = get_password(args.password)
if args.decode:
bits = get_bits_from_video(args.input)
bits = get_bits_from_video(args.input, args.h265)
file_path = None
if args.output:
file_path = args.output
save_bits_to_file(file_path, bits, key)
save_bits_to_file(file_path, bits, key, args.zfec)
elif args.encode:
@ -415,7 +563,7 @@ def main():
)
# get bits from file
bits = get_bits_from_file(args.input, key)
bits = get_bits_from_file(args.input, key, args.zfec)
# create image sequence
make_image_sequence(bits)
@ -425,6 +573,9 @@ def main():
if args.output:
video_file_path = args.output
make_video(video_file_path, args.framerate)
make_video(video_file_path, args.framerate, args.h265)
cleanup()
cleanup()
if __name__ == '__main__':
main()