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blackclue.py
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blackclue.py
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# The code in this file has been copied from
# https://github.com/gandy92/blackclue
# with the modification that it does not use the command-line interface click
# Apache License
# Version 2.0, January 2004
# http://www.apache.org/licenses/
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from __future__ import print_function
import io
import logging
import os
import construct
from pymp4.parser import Box
log = logging.getLogger(__name__)
construct.setglobalfullprinting(True)
# data offset, has_length, termination
emb_file_def = {
b'sttm': (4, False, None, None),
b'ptnm': (4, False, None, None),
b'ptrh': (4, False, None, None),
b'thum': (8, True, None, '.jpg'),
b'gps ': (4, False, b'\x00', '.nmea'),
b'3gf ': (4, False, b'\xff'*10, '.3gf'),
}
def dump(file, dump_embedded, dump_raw_blocks, extended_scan, verbose):
""" Extract GPS and Acceleration data from BlackVue MP4 recordings.
BlackVue extracts data embedded in the MP4 recordings of a BlackVue Dashcam.
"""
for filename in file:
filebase = os.path.splitext(filename)[0]
with open(filename, 'rb') as fd:
fd.seek(0, io.SEEK_END)
eof = fd.tell()
fd.seek(0)
while fd.tell() < eof:
try:
box = Box.parse_stream(fd)
# print(box)
content = dict(box.__getstate__())
ctype = content['type'].decode('utf8')
if 'data' in content and ctype == 'free':
offset = content['offset']
end = content['end']
data = content['data']
if verbose:
print("Found container of type '{}', data has length {}.".format(ctype, len(data)))
if dump_embedded:
with open(filename+"-{:012d}-{}.bin".format(offset, ctype),"wb") as ofd:
ofd.write(data)
idx = 0
while idx < len(data):
block_len = int.from_bytes(data[idx:idx+4], 'big')
block_data = data[idx+4:idx+block_len]
if verbose:
print("Found block with len {}".format(block_len))
if block_len == 0:
break
if dump_raw_blocks:
with open(filebase+"-{:012d}-{}-{:08d}.bin".format(offset, ctype, idx), "wb") as ofd:
ofd.write(block_data)
if block_data[0:4] in emb_file_def:
first, has_length, termination, ext = emb_file_def[block_data[0:4]]
# some data like thmb indicates the length:
last = first + int.from_bytes(block_data[4:8], 'big') if has_length else block_len
# other data like gps is zero terminated:
last = block_data.find(termination) if termination is not None else last
if ext is not None:
with open(filebase+ext, "wb") as ofd:
ofd.write(block_data[first:last])
if ext == '.3gf':
with open(filebase+ext+".txt", "wt") as ofd:
n=0
while first < last:
chunk = block_data[first:first+10]
time_ms = int.from_bytes(chunk[0:4], 'big')
if time_ms == 0xffffffff:
break
acc_1u = int.from_bytes(chunk[4:6], 'big')
acc_2u = int.from_bytes(chunk[6:8], 'big')
acc_3u = int.from_bytes(chunk[8:10], 'big')
acc_1s = int.from_bytes(chunk[4:6], 'big', signed=True)
acc_2s = int.from_bytes(chunk[6:8], 'big', signed=True)
acc_3s = int.from_bytes(chunk[8:10], 'big', signed=True)
ofd.write(("{:8d} "+
"{:08x} {:04x} {:04x} {:04x} "+
"{:6d} {:6d} {:6d} {:6d}\n").format(
n, time_ms, acc_1u, acc_2u, acc_3u, time_ms, acc_1s, acc_2s, acc_3s
))
first += 10
n += 1
idx += block_len
if verbose:
("Got to idx {}.".format(idx))
if not extended_scan:
break
except construct.core.ConstError:
break
except Exception as e:
print(e)
raise