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ChecksumCalculator.py
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ChecksumCalculator.py
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#!/usr/bin/python
#
# Copyright (c) 2015 YUV Checksum calculator authors. All Rights Reserved.
#
# Use of this source code is governed by a GPL v2 license
# that can be found in the LICENSE file in the root of the source tree.
#
from sys import exit, argv
import argparse
import hashlib
import logging
log = logging.getLogger(__name__)
class ChecksumCalculator(object):
"""Class ChecksumCalculator
Calculate checksum of a YUV file.
Support format: IYUV or monochrome Y data
Init: Enter a dictionary with required key value (See argument)
Calculation: call member function calculate()
"""
def __init__(self, args):
self.input_file = args.input_file
self.output_file = args.output_file
self.start = args.start
self.frames_to_calculate = args.frames_to_calculate
self.is_mono = args.is_mono
self.combine_calculate = args.combine_calculate
self.use_md5 = args.use_md5
self.use_sha1 = args.use_sha1
self.width, self.height = args.resolution
self.luma_size = self.width * self.height
self.chroma_size = 0 if self.is_mono else self.luma_size >> 2
if self.use_md5:
self.checksum_func = hashlib.md5
else:
self.checksum_func = hashlib.sha1
def calculate(self):
# frame_left = self.frames_to_calculate
frame_count = 1
skip_byte = (self.luma_size + self.chroma_size) * self.start
# Start calculation frame by frame and save to output file
print("Calculating....")
self.input_file.seek(skip_byte)
chunk = self.input_file.read(self.luma_size)
while chunk and frame_count <= self.frames_to_calculate:
# Log frame number
frame_num_str = "[" + str(frame_count) + "] "
# Luma part
checksum = self.checksum_func()
checksum.update(chunk)
if not self.combine_calculate:
self.output_file.write(checksum.hexdigest() + '\n')
log.debug(frame_num_str + "Y " + checksum.hexdigest())
# Chroma part
if not self.is_mono:
channel = 0
while channel < 2:
chunk = self.input_file.read(self.chroma_size)
if not self.combine_calculate:
checksum = self.checksum_func()
checksum.update(chunk)
if not self.combine_calculate:
self.output_file.write(checksum.hexdigest() + '\n')
log.debug(frame_num_str + ("U " if channel == 0 else "V ") + checksum.hexdigest())
channel += 1
if self.combine_calculate:
self.output_file.write(checksum.hexdigest() + '\n')
log.debug(frame_num_str + checksum.hexdigest())
chunk = self.input_file.read(self.luma_size)
# frame_left -= 1
frame_count += 1
print("Done! {frames} calculated at file {file_name}".format(frames=self.frames_to_calculate,
file_name=self.output_file.name))
return 0
def setup_logger():
# Setup logging information
formatter = logging.Formatter('%(message)s')
console = logging.StreamHandler()
console.setFormatter(formatter)
log.addHandler(console)
log.setLevel(logging.WARNING) # Change debug level here
def get_version():
"""Return this module version"""
return '%(prog)s ' + 'v0.1 alpha'
def arg_parser():
parser = argparse.ArgumentParser(description='Calculate IYUV MD5 or SHA', prog='YUV Checksum Calculator')
parser.add_argument('-v', '--version', action='version', version=get_version())
parser.add_argument('-i', '--input', type=argparse.FileType('rb'), dest='input_file', required=True,
metavar='<file name>',
help='YUV input file name.')
parser.add_argument('-o', '--output', type=argparse.FileType('wt'), dest='output_file', default='out.checksum',
metavar='<file name>',
help='Checksum output file name (text file).')
parser.add_argument('-r', '--res', type=int, nargs=2, dest='resolution', required=True,
metavar=('<W>', '<H>'),
help='Image resolution (Width, Height).')
parser.add_argument('-s', '--start', type=int, dest='start',
metavar='<N>', default=0,
help='N means frame start index (start from 0).')
parser.add_argument('-n', '--frames', type=int, nargs='?', dest='frames_to_calculate', default=0,
metavar='<frame count>',
help='Total frame number need to be calculated. No arg means calculate till EOF.')
parser.add_argument('-m', '--mono', dest='is_mono', action='store_true', default=False,
help='Specify input file is monochrome YUV file.')
parser.add_argument('-c', '--combine', dest='combine_calculate', action='store_true',
help='Only calculate one MD5 for YUV 3 channel combined.')
# parser.add_argument('-p', '--rpadding', type=int, default=0, nargs=1, dest='rpadding',
# metavar='<padding>', help='YUV right padding (in pixels). e.g. To skip 16 pixel data, enter \"-p 16\"')
group = parser.add_mutually_exclusive_group()
group.add_argument('--md5', dest='use_md5', action='store_true',
help='Calculate MD5 checksum (default is true).')
group.add_argument('--sha1', dest='use_sha1', action='store_true',
help='Calculate SHA1 instead of MD5.')
return parser
def arg_parse():
parser = arg_parser()
args = parser.parse_args()
if not args.use_sha1:
args.use_md5 = True
return args
def main():
setup_logger()
args = arg_parse()
checksum_calculator = ChecksumCalculator(args)
exit_status = checksum_calculator.calculate()
return exit_status
if __name__ == '__main__':
exit(main())