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schemas_navico.py
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import construct as c
sl_file_header = c.Struct(
version=c.Enum(c.Int16ul, slg=1, sl2=2, sl3=3),
hardware_version=c.Int16ul,
block_size=c.Int16ul,
p_=c.Padding(2)
)
SL2_HEADER = dict(
version=2,
hardware_version=1,
block_size=3200, # sometimes 1970 sometimes 3200
)
SL3_HEADER = dict(
version=3,
hardware_version=1,
block_size=3200,
)
ValidFlags = c.FlagsEnum(
c.Int16ul,
GPSSpeedValid=1 << 1,
WaterTemperatureValid=1 << 2,
PositionValid=1 << 4,
WaterSpeedValid=1 << 6,
TrackValid=1 << 7,
HeadingValid=1 << 8,
AltitudeValid=1 << 9,
**{f'Flag{i}': 1 << i for i in (0, 3, 5, 10, 11, 12, 13, 14, 15)}
)
ChannelType = c.Enum(
c.Int16ul, Primary=0, Secondary=1, DownScan=2,
Unknown1=3, Unknown2=4, SidescanComposite=5, SidescanStarboard=13, SidescanPort=14)
Frequency = c.Enum(
c.Int8ul, KHz200=0, KHz50=1, KHz83=2, KHz455=3, KHz800=4,
Khz38=5, KHz28=6, Khz130Khz210=7, Khz90Khz150=8, KHz40Khz60=9,
KHz25KHz45=10)
sl2_frame = c.Struct(
# 0
frame_offset=c.Int32ul,
last_frame_offset_primary=c.Default(c.Int32ul, 0),
last_frame_offset_secondary=c.Default(c.Int32ul, 0),
last_frame_offset_down_scan=c.Default(c.Int32ul, 0),
last_frame_offset_left=c.Default(c.Int32ul, 0),
last_frame_offset_right=c.Default(c.Int32ul, 0),
last_frame_offset_composite=c.Default(c.Int32ul, 0),
# 28
frame_size=c.Int16ul,
previous_frame_size=c.Int16ul,
channel_type=ChannelType,
packet_size=c.Int16ul,
# 36
frame_index=c.Int32ul,
upper_limit_feet=c.Float32l,
lower_limit_feet=c.Float32l,
# 48
_pad48=c.Padding(53 - 48),
frequency=Frequency,
_pad51=c.Padding(60 - 54),
# 60
creation_date_time=c.Default(c.Int32sl, -1),
water_depth_feet=c.Float32l,
keel_depth_feet=c.Float32l,
# 68
_pad2=c.Padding(100 - 72),
# 100
gps_speed_knots=c.Float32l,
water_temperature_c=c.Float32l,
easting=c.Int32sl,
northing=c.Int32sl,
water_speed_knots=c.Float32l,
course_over_ground_radians=c.Float32l,
altitude_ft=c.Float32l,
heading_radians=c.Float32l,
# 132
flags=ValidFlags,
# 134
_pad3=c.Padding(140 - 134),
# 140
time_offset=c.Int32ul,
sounded_data=c.Array(count=c.this.packet_size, subcon=c.Int8ul)
)
sl3_frame = c.Struct(
# 0
frame_offset=c.Int32ul,
# 4
_pad4=c.Padding(4),
# 8
frame_size=c.Rebuild(c.Int16ul, c.this.packet_size + 168),
previous_frame_size=c.Int16ul,
channel_type=ChannelType,
# 14
_pad14=c.Padding(2),
# 16
frame_index=c.Int32ul,
upper_limit_feet=c.Float32l,
lower_limit_feet=c.Float32l,
# 28
_pad28=c.Padding(40 - 28),
# 40
creation_date_time=c.Default(c.Int32sl, -1),
packet_size=c.Int16ul,
# 44
_pad46=c.Padding(2),
water_depth_feet=c.Float32l,
frequency=Frequency,
_pad53=c.Padding(80 - 53),
gps_speed_knots=c.Float32l,
water_temperature_c=c.Float32l,
easting=c.Int32sl,
northing=c.Int32sl,
_pad100=c.Padding(4),
track_radians=c.Float32l,
altitude_ft=c.Float32l,
heading_radians=c.Float32l,
flags=ValidFlags,
_pad116=c.Padding(122 - 116),
time_offset=c.Int32ul,
last_frame_offset_primary=c.Default(c.Int32ul, 0),
last_frame_offset_secondary=c.Default(c.Int32ul, 0),
last_frame_offset_down_scan=c.Default(c.Int32ul, 0),
last_frame_offset_left=c.Default(c.Int32ul, 0),
last_frame_offset_right=c.Default(c.Int32ul, 0),
last_frame_offset_composite=c.Default(c.Int32ul, 0),
_pad152=c.Padding(164 - 152),
last_3d_scan_channel=c.Default(c.Int32ul, 0),
sounded_data=c.Array(c.this.packet_size, c.Int8ul)
)