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corrupt_Gen.py
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corrupt_Gen.py
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# -*- coding: utf-8 -*-
"""
Created on Tue Feb 7 13:23:55 2023
@author: LIU TIANYI
"""
import argparse
import os
import binascii
import random
import re
import struct
import subprocess
from fractions import Fraction
# parameters
# GOP_size = 16
parser = argparse.ArgumentParser(description="CorruptionGenerator")
parser.add_argument("-P", "--prob", type=str, required=True)
parser.add_argument("-L", "--pos", type=str, required=True)
parser.add_argument("-S", "--len", type=str, required=True)
args = parser.parse_args()
corr_prob = int(args.prob)
corr_pos = float(args.pos)
corr_len = int(args.len)
def remove_ranges(data, ranges):
ranges = sorted(ranges, reverse=True)
for start, end in ranges:
data_ = data[:start] + data[end:]
# if length of data_ is odd, start from the next byte
if len(data_) % 2 != 0:
data_ = data[:start+1] + data[end+1:]
data = data_
return data
for f in ['test', 'train']:
for root, dirs, files in os.walk('./' + f + '/GT_h264/'):
print('root:',root)
print('dirs:',dirs)
print('files:',files)
print('\n')
for filename in files:
with open(root + filename, 'rb') as BS:
hexBS = binascii.hexlify(BS.read())
# Find all the location of content fragment
startIndex = [a.start() for a in re.finditer(b'000001', hexBS)]
header_index = [l.start() for l in re.finditer(b'00000167', hexBS)]
I_index = [m.start() for m in re.finditer(b'00000165', hexBS)]
P_index = [n.start() for n in re.finditer(b'00000141', hexBS)]
B_index = [o.start() for o in re.finditer(b'00000101', hexBS)]
frameIndexes = I_index + P_index + B_index
startIndex.sort()
frameIndexes.sort()
# corruption occurs between each I-frame and next GOP header
crpt_middle = []
if len(I_index) > 2 and I_index [-2] > max(header_index):
I_index = I_index[:-1]
for i in I_index:
# randomly select frames in this GOP
print("In GOP starts with I-frame index: " + str(i))
if i < max(I_index):
next_header_index = min(idx for idx in header_index if idx > i)
last_frame_in_GOP = max(idx for idx in frameIndexes if idx < next_header_index)
x_list = []
if len(frameIndexes[frameIndexes.index(i): frameIndexes.index(last_frame_in_GOP)+1]) < corr_prob:
corr_prob_ = len(frameIndexes[frameIndexes.index(i): frameIndexes.index(last_frame_in_GOP)+1])
x_list = random.sample(frameIndexes[frameIndexes.index(i): frameIndexes.index(last_frame_in_GOP)+1], corr_prob_) # randomly select n frame in this GOP
else:
x_list = random.sample(frameIndexes[frameIndexes.index(i): frameIndexes.index(last_frame_in_GOP)+1], corr_prob) # randomly select n frame in this GOP
print("x_list: ", x_list)
# x = random.choice(frameIndexes[frameIndexes.index(i): frameIndexes.index(last_frame_in_GOP)+1])
for x in x_list:
y = min(idx for idx in startIndex if idx > x)
num = len(frameIndexes[frameIndexes.index(i): frameIndexes.index(last_frame_in_GOP)+1])
j = 0
while True:
if y-x > corr_len:
print("corruption occurs between " + str(x) + " and " + str(y))
# get corruption position (2048 Bytes)
es = int(y-x-7-corr_len)
print("possible error space (position): " + str(es) + "\n")
crpt_middle.append((int(x+7+es*corr_pos), int(x+7+es*corr_pos)+corr_len))
break
if j == num:
print("corruption occurs between " + str(x) + " and " + str(y))
# every frames in this GOP have too small fragment, we assume that the header is detected and fill the content by one byte
crpt_middle.append((int(x+9), int(y+1)))
break
else:
# look for other frames by sequence in the GOP with enought length
fi = frameIndexes[frameIndexes.index(i): frameIndexes.index(last_frame_in_GOP)+1]
x = fi[j]
y = min(idx for idx in startIndex if idx > x)
j = j + 1
else:
x_list = []
# print(len(frameIndexes[frameIndexes.index(i):]))
if len(frameIndexes[frameIndexes.index(i):]) < corr_prob:
corr_prob_ = len(frameIndexes[frameIndexes.index(i):])
x_list = random.sample(frameIndexes[frameIndexes.index(i): ], corr_prob_) # randomly select n frame in this GOP
else:
x_list = random.sample(frameIndexes[frameIndexes.index(i): ], corr_prob) # randomly select n frame in this GOP
# x = random.choice(frameIndexes[frameIndexes.index(i):])
for x in x_list:
if x < max(frameIndexes): # not the last frame
y = min(idx for idx in startIndex if idx > x)
else:
y = len(hexBS)
print("corruption occurs between " + str(x) + " and " + str(y))
# get corruption position (2048 Bytes)
es = int(y-x-7-corr_len)
print("possible error space (position): " + str(es) + "\n")
crpt_middle.append((int(x+7+es*corr_pos), int(x+7+es*corr_pos)+corr_len))
crpt_middle.sort()
#At the coruption location between the selected index and its next start code
hexBS_new_middle = remove_ranges(hexBS, crpt_middle)
print("corruption position: " + str(crpt_middle))
# calculate the length difference between original and corrupted bitstream
diff = len(hexBS) - len(hexBS_new_middle)
print("length difference: " + str(diff))
bi_hexBS_new_middle = binascii.unhexlify(hexBS_new_middle)
# After corrupt each GOP, write the remained bitstream to file.
if not os.path.exists(f + "_" + str(corr_prob) + str(int(corr_pos*10)) + str(corr_len)):
os.makedirs(f + "_" + str(corr_prob) + str(int(corr_pos*10)) + str(corr_len))
if not os.path.exists(f + "_" + str(corr_prob) + str(int(corr_pos*10)) + str(corr_len) + "/BSC_h264/"):
os.makedirs(f + "_" + str(corr_prob) + str(int(corr_pos*10)) + str(corr_len) + "/BSC_h264/")
f_ = open(f + "_" + str(corr_prob) + str(int(corr_pos*10)) + str(corr_len) + "/BSC_h264/" + filename[:-5] + "_2" + filename[-5:], "wb")
f_.write(bi_hexBS_new_middle)
f_.close()
print(f + "_" + str(corr_prob) + str(corr_pos*10) + str(corr_len) + "/BSC_h264/" + filename[:-5] + "_2" + filename[-5:])
# # Gen GT and BSC_JPEG
for a in ['_144096', '_124096', '_142048', '_244096']:
for filename in os.listdir('train'+a+'/BSC_h264'):
print(' ')
print('files:',filename)
if filename[-5:] == ".h264":
if not os.path.exists("train"+a+"/BSC_JPEGImages/"):
os.makedirs("train"+a+"/BSC_JPEGImages/")
images_folder = 'train'+a+'/BSC_JPEGImages/' + filename[:-7] + '/'
if not os.path.exists(images_folder):
os.makedirs(images_folder)
cmd = 'ffmpeg -i train'+a+'/BSC_h264/' + filename + ' -start_number 0 -qscale:v 2 ' + images_folder + '%05d.jpg'
print(cmd)
subprocess.run(cmd, shell=True)
for filename in os.listdir('test'+a+'/BSC_h264'):
print(' ')
print('files:',filename)
if filename[-5:] == ".h264":
if not os.path.exists("test"+a+"/BSC_JPEGImages/"):
os.makedirs("test"+a+"/BSC_JPEGImages/")
images_folder = 'test'+a+'/BSC_JPEGImages/' + filename[:-7] + '/'
if not os.path.exists(images_folder):
os.makedirs(images_folder)
cmd = 'ffmpeg -i test'+a+'/BSC_h264/' + filename + ' -start_number 0 -qscale:v 2 ' + images_folder + '%05d.jpg'
print(cmd)
subprocess.run(cmd, shell=True)