def test_parse_emsg(self):
emsg1 = Box.parse(self.l_emsg1)
self.assertEqual(emsg1["type"], b'emsg')
self.assertEqual(emsg1["version"], 0)
self.assertEqual(emsg1["id"], 811)
self.assertEqual(emsg1["event_duration"], 233472)
self.assertEqual(emsg1["scheme_id_uri"], b'urn:scte:scte35:2013:bin')
self.assertEqual(
emsg1["message_data"],
b'\xfc0!\x00\x00\x00\x00\x00\x00\x00\xff\xf0\x10\x05\x00\x00\x03+\x7f\xef\x7f\xfe\x00\x1a\x17\xb0\xc0\x00\x00\x00\x00\x00\xe4a$\x02'
)
emsg2 = Box.parse(self.l_emsg2)
self.assertEqual(emsg2["type"], b'emsg')
self.assertEqual(emsg2["version"], 0)
self.assertEqual(emsg2["id"], 812)
self.assertEqual(emsg2["event_duration"], 233472)
self.assertEqual(emsg2["scheme_id_uri"], b'urn:scte:scte35:2013:bin')
self.assertEqual(
emsg2["message_data"],
b'\xfc0!\x00\x00\x00\x00\x00\x00\x00\xff\xf0\x10\x05\x00\x00\x03,\x7f\xef\x7f\xfe\x00\x1a\x17\xb0\xc0\x00\x00\x00\x00\x00\xfe\xcc\xb92'
)
embe1 = Box.parse(self.l_embe)
self.assertEqual(embe1["type"], b'embe')
def test_smhd_parse(self):
in_bytes = b'\x00\x00\x00\x10smhd\x00\x00\x00\x00\x00\x00\x00\x00'
self.assertEqual(
Box.parse(in_bytes + b'padding'),
Container(offset=0)
(type=b"smhd")(version=0)(flags=0)
(balance=0)(reserved=0)(end=len(in_bytes))
)
def test_mdhd_parse(self):
self.assertEqual(
Box.parse(
b'\x00\x00\x00\x20mdhd\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0fB@\x00\x00\x00\x00U\xc4\x00\x00'
),
Container(offset=0)(type=b"mdhd")(version=0)(flags=0)(
creation_time=0)(modification_time=0)(timescale=1000000)(
duration=0)(language="und")(end=32))
def test_stsd_parse(self):
tx3g_data = b'\x00\x00\x00\x00\x01\xFF\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x12\xFF\xFF\xFF\xFF\x00\x00\x00\x12ftab\x00\x01\x00\x01\x05Serif'
in_bytes = b'\x00\x00\x00\x50stsd\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x40tx3g\x00\x00\x00\x00\x00\x00\x00\x01' + tx3g_data
self.assertEqual(
Box.parse(in_bytes + b'padding'),
Container(offset=0)(type=b"stsd")(version=0)(flags=0)(entries=[
Container(format=b'tx3g')(data_reference_index=1)(
data=tx3g_data)
])(end=len(in_bytes)))
def test_parse_stsd_urim(self):
urim_sample_entry = Box.parse(self.l_stsd_emsg1)
self.assertEqual(len(urim_sample_entry["entries"]), 1)
for entry in urim_sample_entry["entries"]:
self.assertEqual(entry["format"], b"urim")
for l_child in entry["children"]:
if l_child["type"] != b"uriI":
self.assertEqual(l_child["type"][0:3], b'uri')
self.assertEqual(l_child["theURI"],
b"urn:mpeg:dash:event:2012")
def test_ftyp_parse(self):
self.assertEqual(
Box.parse(b'\x00\x00\x00\x18ftypiso5\x00\x00\x00\x01iso5avc1'),
Container(offset=0)
(type=b"ftyp")
(major_brand=b"iso5")
(minor_version=1)
(compatible_brands=[b"iso5", b"avc1"])
(end=24)
)
def test_tenc_parse(self):
self.assertEqual(
Box.parse(b'\x00\x00\x00 tenc\x00\x00\x00\x00\x00\x00\x01\x083{\x96C!\xb6CU\x9eY>\xcc\xb4l~\xf7'),
Container(offset=0)
(type=b"tenc")
(version=0)
(flags=0)
(is_encrypted=1)
(iv_size=8)
(key_ID=UUID('337b9643-21b6-4355-9e59-3eccb46c7ef7'))
(end=32)
)
def test_parse_trun(self):
trun_box1 = Box.parse(self.l_trun_emsg)
self.assertEqual(trun_box1["type"], b'trun')
self.assertEqual(trun_box1["version"], 0)
self.assertEqual(
trun_box1["flags"]["sample_composition_time_offsets_present"],
False)
self.assertEqual(trun_box1["flags"]["sample_flags_present"], False)
self.assertEqual(trun_box1["flags"]["sample_size_present"], True)
self.assertEqual(trun_box1["flags"]["sample_duration_present"], True)
self.assertEqual(trun_box1["flags"]["first_sample_flags_present"],
False)
self.assertEqual(trun_box1["flags"]["data_offset_present"], True)
self.assertEqual(trun_box1["sample_count"], 1)
self.assertEqual(trun_box1["data_offset"], 112)
self.assertEqual(len(trun_box1["sample_info"]), 1)
self.assertEqual(trun_box1["sample_info"][0]["sample_duration"], 25600)
self.assertEqual(trun_box1["sample_info"][0]["sample_size"], 8)
trun_box2 = Box.parse(self.l_trun2_emsg)
self.assertEqual(trun_box2["type"], b'trun')
self.assertEqual(trun_box2["version"], 0)
self.assertEqual(
trun_box2["flags"]["sample_composition_time_offsets_present"],
False)
self.assertEqual(trun_box2["flags"]["sample_flags_present"], False)
self.assertEqual(trun_box2["flags"]["sample_size_present"], True)
self.assertEqual(trun_box2["flags"]["sample_duration_present"], True)
self.assertEqual(trun_box2["flags"]["first_sample_flags_present"],
False)
self.assertEqual(trun_box2["flags"]["data_offset_present"], True)
self.assertEqual(trun_box2["sample_count"], 1)
self.assertEqual(trun_box2["data_offset"], 112)
self.assertEqual(len(trun_box2["sample_info"]), 1)
self.assertEqual(trun_box2["sample_info"][0]["sample_duration"],
233472)
self.assertEqual(trun_box2["sample_info"][0]["sample_size"], 90)
def test_parse_edit_list(self):
elst_b = Box.parse(
b'\x00\x00\x00\x1celst\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x0f\xa0\x00\x00\x04\x00\x00\x01\x00\x00'
)
[Container(edit_duration=4000)(media_time=1024)]
self.assertEqual(elst_b["type"], b"elst")
self.assertEqual(len(elst_b["entries"]), 1)
self.assertEqual(elst_b["entries"][0]["edit_duration"], 4000)
self.assertEqual(elst_b["entries"][0]["media_time"], 1024)
self.assertEqual(elst_b["entries"][0]["media_rate_integer"], 1)
self.assertEqual(elst_b["entries"][0]["media_rate_fraction"], 0)
t = dict(
type=b"elst",
version=1,
flags=0,
entries=[dict(edit_duration=1,media_time=1, media_rate_integer=1, media_rate_fraction=1)\
,dict(edit_duration=2,media_time=2, media_rate_integer=1,
media_rate_fraction=1) ],
)
elst_b = Box.build(t)
t2 = Box.parse(elst_b)
self.assertEqual(len(t["entries"]), len(t2["entries"]))
def test_parse_stbl_progressive(self):
stbl = Box.parse(l_stbl_audio_4s)
self.assertNotEqual(stbl, None)
stsd = BoxUtil.find_and_return_first(stbl, b'stsd')
self.assertEqual(len(stsd["entries"]), 1)
self.assertEqual(stsd["entries"][0]["format"], b"mp4a")
mp4a = stsd["entries"][0]
self.assertEqual(mp4a["channels"], 2)
self.assertEqual(mp4a["sampling_rate"], 48000)
stsz = BoxUtil.find_and_return_first(stbl, b'stsz')
self.assertNotEqual(stsz, None)
self.assertEqual(stsz["sample_count"], 189)
stco = BoxUtil.find_and_return_first(stbl, b'stco')
self.assertNotEqual(stco, None)
self.assertEqual(len(stco["entries"]), 1)
stts = BoxUtil.find_and_return_first(stbl, b'stts')
self.assertNotEqual(stts, None)
self.assertEqual(len(stts["entries"]), 2)
def test_udta_terminator_parse(self):
ilst = b'\x00\x00\x00\x25\xA9\x74\x6F\x6F\x00\x00\x00\x1D\x64\x61\x74\x61\x00\x00\x00\x01\x00\x00\x00\x00\x4C\x61\x76\x66\x35\x37\x2E\x32\x35\x2E\x31\x30\x30'
input_bytes = (
b'\x00\x00\x00\x66udta'
b'\x00\x00\x00\x5ameta\x00\x00\x00\x00'
b'\x00\x00\x00\x21hdlr\x00\x00\x00\x00\x00\x00\x00\x00mdir\x61\x70\x70\x6C\x00\x00\x00\x00\x00\x00\x00\x00\x00'
b'\x00\x00\x00\x2Dilst' + ilst + b'\x00\x00\x00\x00')
self.assertEqual(
Box.parse(input_bytes),
Container(offset=0)(type=b'udta')(children=[
Container(offset=8)(type=b'meta')(version=0)(flags=0)(
children=[
Container(offset=20)(type=b'hdlr')(version=0)(flags=0)(
handler_type=b'mdir')(name=u'')(end=53),
Container(offset=53)(type=b'ilst')(data=ilst)(
end=len(input_bytes) - 4)
])(end=len(input_bytes) - 4)
])(end=len(input_bytes)))
def test_build_emib(self):
emib_b = Box.build(
dict(type=b"emib",
version=0,
reserved=1,
presentation_time_delta=-1000,
value=b'',
id=1,
scheme_id_uri=b"my_test_scheme",
duration=2000,
message_data=b"asdfdasgfaghhgsdgh"))
emib_b_p = Box.parse(emib_b)
self.assertEqual(emib_b_p["type"], b'emib')
self.assertEqual(emib_b_p["presentation_time_delta"], -1000)
self.assertEqual(emib_b_p["value"], b'')
self.assertEqual(emib_b_p["id"], 1)
self.assertEqual(emib_b_p["scheme_id_uri"], b"my_test_scheme")
self.assertEqual(emib_b_p["duration"], 2000)
self.assertEqual(emib_b_p["reserved"], 1)
self.assertEqual(emib_b_p["message_data"], b"asdfdasgfaghhgsdgh")
def test_build_emsg(self):
emsg_b = Box.build(
dict(type=b"emsg",
version=1,
presentation_time=1000,
value=b'',
id=1,
scheme_id_uri=b"my_test_scheme",
event_duration=20,
timescale=1,
message_data=b"asdfdasgfaghhgsdgh"))
emsg_b_p = Box.parse(emsg_b)
self.assertEqual(emsg_b_p["type"], b'emsg')
self.assertEqual(emsg_b_p["version"], 1)
self.assertEqual(emsg_b_p["presentation_time"], 1000)
self.assertEqual(emsg_b_p["value"], b'')
self.assertEqual(emsg_b_p["id"], 1)
self.assertEqual(emsg_b_p["scheme_id_uri"], b"my_test_scheme")
self.assertEqual(emsg_b_p["event_duration"], 20)
self.assertEqual(emsg_b_p["timescale"], 1)
self.assertEqual(emsg_b_p["message_data"], b"asdfdasgfaghhgsdgh")
def get_points_from_bv(path, use_nmea_stream_timestamp=False):
points = []
fd = open(path, 'rb')
fd.seek(0, io.SEEK_END)
eof = fd.tell()
fd.seek(0)
date = None
first_gps_date = None
first_gps_time = None
found_first_gps_date = False
found_first_gps_time = False
while fd.tell() < eof:
try:
box = Box.parse_stream(fd)
except RangeError:
print('error parsing blackvue GPS information, exiting')
sys.exit(1)
except ConstError:
print('error parsing blackvue GPS information, exiting')
sys.exit(1)
if box.type.decode('utf-8') == 'free':
length = len(box.data)
offset = 0
while offset < length:
newb = Box.parse(box.data[offset:])
if newb.type.decode('utf-8') == 'gps':
lines = newb.data
# Parse GPS trace
for l in lines.splitlines():
m = l.lstrip('[]0123456789')
# this utc millisecond timestamp seems to be the camera's
# todo: unused?
# match = re.search('\[([0-9]+)\]', l)
# if match:
# utcdate = match.group(1)
#By default, use camera timestamp. Only use GPS Timestamp if camera was not set up correctly and date/time is wrong
if use_nmea_stream_timestamp == False:
if "$GPGGA" in m:
match = re.search('\[([0-9]+)\]', l)
if match:
epoch_in_local_time = match.group(1)
camera_date = datetime.datetime.utcfromtimestamp(
int(epoch_in_local_time) / 1000.0)
data = pynmea2.parse(m)
if (data.is_valid):
if found_first_gps_time == False:
first_gps_time = data.timestamp
found_first_gps_time = True
lat, lon, alt = data.latitude, data.longitude, data.altitude
points.append((camera_date, lat, lon, alt))
if use_nmea_stream_timestamp == True or found_first_gps_date == False:
if "GPRMC" in m:
try:
data = pynmea2.parse(m)
if data.is_valid:
date = data.datetime.date()
if found_first_gps_date == False:
first_gps_date = date
except pynmea2.ChecksumError as e:
# There are often Checksum errors in the GPS stream, better not to show errors to user
pass
except Exception as e:
print(
"Warning: Error in parsing gps trace to extract date information, nmea parsing failed"
)
if use_nmea_stream_timestamp == True:
if "$GPGGA" in m:
try:
data = pynmea2.parse(m)
if (data.is_valid):
lat, lon, alt = data.latitude, data.longitude, data.altitude
if not date:
timestamp = data.timestamp
else:
timestamp = datetime.datetime.combine(
date, data.timestamp)
points.append(
(timestamp, lat, lon, alt))
except Exception as e:
print(
"Error in parsing gps trace to extract time and gps information, nmea parsing failed due to {}"
.format(e))
#If there are no points after parsing just return empty vector
if points == []:
return []
#After parsing all points, fix timedate issues
if use_nmea_stream_timestamp == False:
# If we use the camera timestamp, we need to get the timezone offset, since Mapillary backend expects UTC timestamps
first_gps_timestamp = datetime.datetime.combine(
first_gps_date, first_gps_time)
delta_t = points[0][0] - first_gps_timestamp
if delta_t.days > 0:
hours_diff_to_utc = round(delta_t.total_seconds() /
3600)
else:
hours_diff_to_utc = round(
delta_t.total_seconds() / 3600) * -1
utc_points = []
for idx, point in enumerate(points):
delay_compensation = datetime.timedelta(
seconds=-1.8
) #Compensate for solution age when location gets timestamped by camera clock. Value is empirical from various cameras/recordings
new_timestamp = points[idx][0] + datetime.timedelta(
hours=hours_diff_to_utc) + delay_compensation
lat = points[idx][1]
lon = points[idx][2]
alt = points[idx][3]
utc_points.append((new_timestamp, lat, lon, alt))
points = utc_points
points.sort()
else:
#add date to points that don't have it yet, because GPRMC message came later
utc_points = []
for idx, point in enumerate(points):
if type(points[idx][0]) != type(
datetime.datetime.today()):
timestamp = datetime.datetime.combine(
first_gps_date, points[idx][0])
else:
timestamp = points[idx][0]
lat = points[idx][1]
lon = points[idx][2]
alt = points[idx][3]
utc_points.append((timestamp, lat, lon, alt))
points = utc_points
points.sort()
offset += newb.end
break
return points
def get_points_from_bv(path,use_nmea_stream_timestamp=False):
points = []
with open(path, 'rb') as fd:
fd.seek(0, io.SEEK_END)
eof = fd.tell()
fd.seek(0)
date = None
first_gps_date = None
first_gps_time = None
found_first_gps_date = False
found_first_gps_time = False
while fd.tell() < eof:
try:
box = Box.parse_stream(fd)
except RangeError:
print('error parsing blackvue GPS information, exiting')
sys.exit(1)
except ConstError:
print('error parsing blackvue GPS information, exiting')
sys.exit(1)
if box.type.decode('utf-8') == 'free':
length = len(box.data)
offset = 0
while offset < length:
newb = Box.parse(box.data[offset:])
if newb.type.decode('utf-8') == 'gps':
lines = newb.data
# Parse GPS trace
for l in lines.splitlines():
m = l.lstrip('[]0123456789')
# this utc millisecond timestamp seems to be the camera's
# todo: unused?
# match = re.search('\[([0-9]+)\]', l)
# if match:
# utcdate = match.group(1)
#By default, use camera timestamp. Only use GPS Timestamp if camera was not set up correctly and date/time is wrong
if use_nmea_stream_timestamp==False:
if "$GPGGA" in m:
match = re.search('\[([0-9]+)\]', l)
if match:
epoch_in_local_time = match.group(1)
camera_date=datetime.datetime.utcfromtimestamp(int(epoch_in_local_time)/1000.0)
data = pynmea2.parse(m)
if(data.is_valid):
if found_first_gps_time == False:
first_gps_time = data.timestamp
found_first_gps_time = True
lat, lon, alt = data.latitude, data.longitude, data.altitude
points.append((camera_date, lat, lon, alt))
if use_nmea_stream_timestamp==True or found_first_gps_date==False:
if "GPRMC" in m:
try:
data = pynmea2.parse(m)
if data.is_valid:
date = data.datetime.date()
if found_first_gps_date == False:
first_gps_date=date
except pynmea2.ChecksumError as e:
# There are often Checksum errors in the GPS stream, better not to show errors to user
pass
except Exception as e:
print(
"Warning: Error in parsing gps trace to extract date information, nmea parsing failed")
if use_nmea_stream_timestamp==True:
if "$GPGGA" in m:
try:
data = pynmea2.parse(m)
if(data.is_valid):
lat, lon, alt = data.latitude, data.longitude, data.altitude
if not date:
timestamp = data.timestamp
else:
timestamp = datetime.datetime.combine(
date, data.timestamp)
points.append((timestamp, lat, lon, alt))
except Exception as e:
print(
"Error in parsing gps trace to extract time and gps information, nmea parsing failed due to {}".format(e))
#If there are no points after parsing just return empty vector
if points == []:
return []
#After parsing all points, fix timedate issues
if use_nmea_stream_timestamp==False:
# If we use the camera timestamp, we need to get the timezone offset, since Mapillary backend expects UTC timestamps
first_gps_timestamp = datetime.datetime.combine(first_gps_date, first_gps_time)
delta_t = points[0][0]-first_gps_timestamp
if delta_t.days>0:
hours_diff_to_utc = round(delta_t.total_seconds()/3600)
else:
hours_diff_to_utc = round(delta_t.total_seconds()/3600) * -1
utc_points=[]
for idx, point in enumerate(points):
delay_compensation = datetime.timedelta(seconds=-1.8) #Compensate for solution age when location gets timestamped by camera clock. Value is empirical from various cameras/recordings
new_timestamp = points[idx][0]+datetime.timedelta(hours=hours_diff_to_utc)+delay_compensation
lat = points[idx][1]
lon = points[idx][2]
alt = points[idx][3]
utc_points.append((new_timestamp, lat, lon, alt))
points = utc_points
points.sort()
else:
#add date to points that don't have it yet, because GPRMC message came later
utc_points=[]
for idx, point in enumerate(points):
if type(points[idx][0]) != type(datetime.datetime.today()):
timestamp = datetime.datetime.combine(
first_gps_date, points[idx][0])
else:
timestamp = points[idx][0]
lat = points[idx][1]
lon = points[idx][2]
alt = points[idx][3]
utc_points.append((timestamp, lat, lon, alt))
points = utc_points
points.sort()
offset += newb.end
break
return points
def test_parse_stbl_parse_samples_progressive(self):
moov_a = Box.parse(l_movie_box_audio)
res = BoxUtil.find_samples_progressive(moov_a, moov_a)
self.assertEqual(len(res), 189)
def get_points_from_bv(path):
points = []
fd = open(path, 'rb')
fd.seek(0, io.SEEK_END)
eof = fd.tell()
fd.seek(0)
date = None
while fd.tell() < eof:
try:
box = Box.parse_stream(fd)
except RangeError:
print('error parsing blackvue GPS information, exiting')
sys.exit(1)
except ConstError:
print('error parsing blackvue GPS information, exiting')
sys.exit(1)
if box.type.decode('utf-8') == 'free':
length = len(box.data)
offset = 0
while offset < length:
newb = Box.parse(box.data[offset:])
if newb.type.decode('utf-8') == 'gps':
lines = newb.data
for l in lines:
if "GPRMC" in l:
m = l.lstrip('[]0123456789')
try:
data = pynmea2.parse(m)
date = data.datetime.date()
except Exception as e:
print(
"Error in extracting the gps trace, nmea parsing failed due to {}"
.format(e))
break
# Parse GPS trace
for l in lines.splitlines():
# this utc millisecond timestamp seems to be the camera's
# todo: unused?
# match = re.search('\[([0-9]+)\]', l)
# if match:
# utcdate = match.group(1)
m = l.lstrip('[]0123456789')
if "GPRMC" in m:
try:
data = pynmea2.parse(m)
date = data.datetime.date()
except Exception as e:
print(
"Error in parsing gps trace to extract date information, nmea parsing failed due to {}"
.format(e))
if "$GPGGA" in m:
try:
if not date:
print(
"Error, could not extract date from the video gps trace, exiting..."
)
sys.exit(1)
data = pynmea2.parse(m)
timestamp = datetime.datetime.combine(
date, data.timestamp)
lat, lon, alt = data.latitude, data.longitude, data.altitude
points.append((timestamp, lat, lon, alt))
except Exception as e:
print(
"Error in parsing gps trace to extract time and gps information, nmea parsing failed due to {}"
.format(e))
points.sort()
offset += newb.end
break
return points
def detect_file_type(input_file):
device = "X"
make = "unknown"
model = "unknown"
if input_file.lower().endswith(".ts"):
with open(input_file, "rb") as f:
device = "A"
input_packet = f.read(188) #First packet, try to autodetect
if bytes("\xB0\x0D\x30\x34\xC3", encoding="raw_unicode_escape"
) in input_packet[4:20] or args.device_override == "V":
device = "V"
make = "Viofo"
model = "A119 V3"
if bytes("\x40\x1F\x4E\x54\x39", encoding="raw_unicode_escape"
) in input_packet[4:20] or args.device_override == "B":
device = "B"
make = "Blueskysea"
model = "B4K"
while device == "A":
currentdata = {}
input_packet = f.read(188)
if not input_packet:
break
#Autodetect camera type
if device == 'A' and input_packet.startswith(
bytes("\x47\x03\x00", encoding="raw_unicode_escape")):
bs = list(input_packet)
active = chr(bs[156])
lathem = chr(bs[157])
lonhem = chr(bs[158])
if lathem in "NS" and lonhem in "EW":
device = "B"
make = "Blueskysea"
model = "B4K"
print("Autodetected as Blueskysea B4K")
break
if device == 'A' and input_packet.startswith(
bytes("\x47\x43\x00", encoding="raw_unicode_escape")):
bs = list(input_packet)
active = chr(bs[34])
lathem = chr(bs[35])
lonhem = chr(bs[36])
if lathem in "NS" and lonhem in "EW":
device = "V"
print("Autodetected as Viofo A119 V3")
make = "Viofo"
model = "A119 V3"
break
if input_file.lower().endswith(
".mp4"): #Guess which MP4 method is used: Novatek, Subtitle, NMEA
with open(input_file, "rb") as fx:
if True:
fx.seek(0, io.SEEK_END)
eof = fx.tell()
fx.seek(0)
lines = []
while fx.tell() < eof:
try:
box = Box.parse_stream(fx)
except:
pass
#print (box.type.decode("utf-8"))
if box.type.decode("utf-8") == "free":
length = len(box.data)
offset = 0
while offset < length:
inp = Box.parse(box.data[offset:])
#print (inp.type.decode("utf-8"))
if inp.type.decode("utf-8") == "gps": #NMEA-based
lines = inp.data
for line in lines.splitlines():
m = str(line).lstrip("[]0123456789")
if "$GPGGA" in m:
device = "N"
make = "NMEA-based video"
model = "unknown"
break
offset += inp.end
if box.type.decode(
"utf-8") == "gps": #has Novatek-specific stuff
fx.seek(0)
largeelem = fx.read()
startbytes = [
m.start()
for m in re.finditer(b'freeGPS', largeelem)
]
del largeelem
if len(startbytes) > 0:
make = "Novatek"
model = "MP4"
device = "T"
break
if box.type.decode("utf-8") == "moov":
try:
length = len(box.data)
except:
length = 0
offset = 0
while offset < length:
inp = Box.parse(box.data[offset:])
#print (inp.type.decode("utf-8"))
if inp.type.decode("utf-8") == "gps": #NMEA-based
lines = inp.data
print(len(inp.data))
for line in lines.splitlines():
m = str(line).lstrip("[]0123456789")
if "$GPGGA" in m:
device = "N"
make = "NMEA-based video"
model = "unknown"
#break
offset += inp.end
else:
pass
if device == "X":
fx.seek(0)
largeelem = fx.read()
startbytes = [
m.start() for m in re.finditer(
b'\x00\x14\x50\x4E\x44\x4D\x00\x00\x00\x00', largeelem)
]
del largeelem
if len(startbytes) > 0:
make = "Garmin"
model = "unknown"
device = "G"
if device == "X":
fx.seek(0)
largeelem = fx.read()
startbytes = [
m.start() for m in re.finditer(b'GPGGA', largeelem)
]
del largeelem
if len(startbytes) > 0:
make = "NEXTBASE"
model = "unknown"
device = "NB"
return device, make, model
def read(self) -> Telemetry:
tel = Telemetry()
with open(self.source, '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)
except RangeError:
print('error parsing blackvue GPS information, exiting')
sys.exit(1)
except ConstError:
print('error parsing blackvue GPS information, exiting')
sys.exit(1)
if box.type.decode('utf-8') == 'free':
length = len(box.data)
offset = 0
while offset < length:
newb = Box.parse(box.data[offset:])
if newb.type.decode('utf-8') == 'gps':
lines = newb.data.decode('utf-8')
# Parse GPS trace
timestamp = None
packet = None
for l in lines.splitlines():
m = l.lstrip('[]0123456789')
if not m:
continue
match = re.search('\[([0-9]+)\]', l)
# If new timestamp found
if match and match.group(1) != timestamp:
if packet:
tel.append(packet)
packet = Packet()
timestamp = match.group(1)
packet[TimestampElement.
name] = TimestampElement(
float(timestamp) * 1e-3)
#remove timestamp on tail if it exists
try:
m = m[:m.rindex('[')]
except:
pass
try:
m = m[:m.index("\x00")]
except:
pass
try:
nmea_data = pynmea2.parse(m)
if nmea_data and nmea_data.sentence_type == 'GGA':
packet[LatitudeElement.
name] = LatitudeElement(
nmea_data.latitude)
packet[LongitudeElement.
name] = LongitudeElement(
nmea_data.longitude)
if nmea_data.altitude:
packet[AltitudeElement.
name] = AltitudeElement(
nmea_data.altitude)
if nmea_data and nmea_data.sentence_type == 'VTG':
packet[
SpeedElement.name] = SpeedElement(
nmea_data.spd_over_grnd_kmph /
3.6) #convert to m/s
except:
self.logger.warn(
"Couldn't parse nmea sentence. Skipping..."
)
if packet:
tel.append(packet)
offset += newb.end
break
return tel
def get_points_from_bv(path,use_nmea_stream_timestamp=False):
points = []
fd = open(path, 'rb')
fd.seek(0, io.SEEK_END)
eof = fd.tell()
fd.seek(0)
date = None
while fd.tell() < eof:
try:
box = Box.parse_stream(fd)
except RangeError:
print('error parsing blackvue GPS information, exiting')
sys.exit(1)
except ConstError:
print('error parsing blackvue GPS information, exiting')
sys.exit(1)
if box.type.decode('utf-8') == 'free':
length = len(box.data)
offset = 0
while offset < length:
newb = Box.parse(box.data[offset:])
if newb.type.decode('utf-8') == 'gps':
lines = newb.data
# Parse GPS trace
for l in lines.splitlines():
# this utc millisecond timestamp seems to be the camera's
# todo: unused?
# match = re.search('\[([0-9]+)\]', l)
# if match:
# utcdate = match.group(1)
#By default, use camera timestamp. Only use GPS Timestamp if camera was not set up correctly and date/time is wrong
if use_nmea_stream_timestamp==False:
m = l.lstrip('[]0123456789')
if "$GPGGA" in m:
match = re.search('\[([0-9]+)\]', l)
if match:
utcdate = match.group(1)
date=datetime.datetime.utcfromtimestamp(int(utcdate)/1000.0)
data = pynmea2.parse(m)
if(data.is_valid):
lat, lon, alt = data.latitude, data.longitude, data.altitude
points.append((date, lat, lon, alt))
else:
if "GPRMC" in m:
try:
data = pynmea2.parse(m)
date = data.datetime.date()
except Exception as e:
print(
"Error in parsing gps trace to extract date information, nmea parsing failed due to {}".format(e))
if "$GPGGA" in m:
try:
if not date:
#discarding Lat/Lon messages if date has not been set yet. TODO: we could save the messages and add the date later
continue
data = pynmea2.parse(m)
if(data.is_valid):
timestamp = datetime.datetime.combine(
date, data.timestamp)
lat, lon, alt = data.latitude, data.longitude, data.altitude
points.append((timestamp, lat, lon, alt))
except Exception as e:
print(
"Error in parsing gps trace to extract time and gps information, nmea parsing failed due to {}".format(e))
points.sort()
offset += newb.end
break
return points
def get_gps_data_nmea(input_file, device):
packetno = 0
locdata = {}
with open(input_file, "rb") as fx:
if True:
fx.seek(0, io.SEEK_END)
eof = fx.tell()
fx.seek(0)
prevts = 0
lines = []
while fx.tell() < eof:
try:
box = Box.parse_stream(fx)
except:
pass
if box.type.decode("utf-8") == "free":
try:
length = len(box.data)
except:
length = 0
offset = 0
while offset < length:
inp = Box.parse(box.data[offset:])
#print (inp.type.decode("utf-8"))
if inp.type.decode("utf-8") == "gps": #NMEA-based
lines = inp.data
for line in lines.splitlines():
m = str(line)
if "$GPRMC" in m:
currentdata = {}
currentdata["ts"] = int(m[3:13])
#print (m)
try:
currentdata["lat"] = float(
m.split(",")[3][0:2]) + float(
m.split(",")[3][2:]) / 60
currentdata["latR"] = m.split(",")[4]
if currentdata["latR"] == "S":
currentdata[
"lat"] = -currentdata["lat"]
currentdata["lon"] = float(
m.split(",")[5][0:3]) + float(
m.split(",")[5][3:]) / 60
currentdata["lonR"] = m.split(",")[6]
if currentdata["lonR"] == "N":
currentdata[
"lon"] = -currentdata["lon"]
except:
pass
try:
currentdata["bearing"] = float(
m.split(",")[9])
currentdata["speed"] = float(
m.split(",")[8]) * 1.6 / 3.6
except:
currentdata["bearing"] = 0
currentdata["speed"] = 0
active = (m.split(",")[2])
nts = currentdata["ts"]
currentdata["metric"] = 0
currentdata["prevdist"] = 0
try:
currentdata["mx"], currentdata[
"my"] = lonlat_metric(
currentdata["lon"],
currentdata["lat"])
except:
pass
if active == "A" and nts > prevts:
locdata[packetno] = currentdata
prevts = nts
packetno += 1
del currentdata
offset += inp.end
return locdata, packetno