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ais8.cpp
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ais8.cpp
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// Since 2010-05-19
// Binary Broadcast Message (BBM) - 8
#include "ais.h"
#include <iomanip>
Ais8::Ais8(const char *nmea_payload) {
assert(nmea_payload);
assert(nmea_ord_initialized); // Make sure we have the lookup table built
init();
const int payload_len = strlen(nmea_payload)*6 - 46; // in bits w/o DAC/FI
//std::cout << "payload_len: " << strlen(nmea_payload) << " " << strlen(nmea_payload)*6 << " " << payload_len << " " << payload_len / 8 << "\n";
if (payload_len < 0 or payload_len > 952) {
status = AIS_ERR_BAD_BIT_COUNT;
return;
}
std::bitset<MAX_BITS> bs; // FIX: shouldn't this be a max of 1192?
status = aivdm_to_bits(bs, nmea_payload);
if (had_error()) return; // checks status
if (!decode_header8(bs)) return; // side effect - sets status
// Handle all the byte aligned payload
for (int i=0; i<payload_len/8; i++) {
const int start = 56+i*8;
//std::cout << "payload: " << i << " " << start <<"\n";
payload.push_back(ubits(bs,start,8));
}
const int remainder = payload_len % 8; // FIX: need to handle spare bits!!
//std::cout << "remainder: " << remainder << "\n";
if (remainder > 0) {
const int start = (payload_len/8) * 8;
//std::cout << "start: " << start <<"\n";
payload.push_back(ubits(bs, start, remainder));
}
}
bool Ais8::decode_header8(const std::bitset<MAX_BITS> &bs) {
message_id = ubits(bs, 0, 6);
if (8 != message_id) { status = AIS_ERR_WRONG_MSG_TYPE; return false; }
repeat_indicator = ubits(bs,6,2);
mmsi = ubits(bs,8,30);
spare = ubits(bs,38,2);
dac = ubits(bs,40,10);
fi = ubits(bs,50,6);
return true;
}
void Ais8::print() {
std::cout << "AIS_broadcast_binary_message: " << message_id
<< "\t\tdac: " << dac << "\tfi:" << fi << "\n";
std::cout << "\tpayload: "; // << std::hex << std::uppercase; // << std::setfill('0') << std::setw(2) << "\n";
for (std::vector<unsigned char>::iterator i = payload.begin(); i != payload.end(); i++) {
std::cout << std::hex <<std::setfill('0') << std::setw(2)<< int(*i);
}
std::cout << std::dec << std::nouppercase << std::endl;
//std::cout << "test: " << 1 << " " << 255 << " " << std::hex << 255 << std::endl;
}
//////////////////////////////////////////////////////////////////////
Ais8_1_11::Ais8_1_11(const char *nmea_payload) {
assert(nmea_payload);
init();
//CHECKPOINT;
if (strlen(nmea_payload) != 59) { status = AIS_ERR_BAD_BIT_COUNT; return; }
std::bitset<354> bs; // 352 + 2 spares to be 6 bit aligned
status = aivdm_to_bits(bs, nmea_payload);
if (had_error()) return; // checks status
// CHECKPOINT;
message_id = ubits(bs, 0, 6);
if (8 != message_id) { status = AIS_ERR_WRONG_MSG_TYPE; return; }
repeat_indicator = ubits(bs,6,2);
mmsi = ubits(bs,8,30);
spare = ubits(bs,38,2);
dac = ubits(bs,40,10);
fi = ubits(bs,50,6);
//CHECKPOINT;
// FIX: if dac is not 001, it could still possibly be correct
if ( 1 != dac || 11 != fi ) { status = AIS_ERR_WRONG_MSG_TYPE; return; }
y = sbits(bs,56,24) / 60000.; // YES, lat is first
x = sbits(bs,80,25) / 60000.;
day = ubits(bs,105,5);
hour = ubits(bs,110,5);
minute = ubits(bs,115,6);
wind_ave = ubits(bs,121,7);
wind_gust = ubits(bs,128,7);
wind_dir = ubits(bs,135,9);
wind_gust_dir = ubits(bs,144,9);
air_temp = ubits(bs,153,11) / 10. - 60;
rel_humid = ubits(bs,164,7);
dew_point = ubits(bs,171,10) / 10. - 20; // FIX: please be right
air_pres = ubits(bs,181,9) + 800;
air_pres_trend = ubits(bs,190,2);
horz_vis = ubits(bs,192,8) / 10.;
water_level = ubits(bs,200,9) / 10. - 10; // FIX: please be right for -10.0 to 30.0
water_level_trend = ubits(bs,209,2);
surf_cur_speed = ubits(bs,211,8) / 10.;
surf_cur_dir = ubits(bs,219,9);
cur_speed_2 = ubits(bs,228,8) / 10.;
cur_dir_2 = ubits(bs,236,9);
cur_depth_2 = ubits(bs,245,5);
cur_speed_3 = ubits(bs,250,8) / 10.;
cur_dir_3 = ubits(bs,258,9);
cur_depth_3 = ubits(bs,267,5);
wave_height = ubits(bs,272,8) / 10.;
wave_period = ubits(bs,280,6);
wave_dir = ubits(bs,286,9);
swell_height = ubits(bs,295,8) / 10.;
swell_period = ubits(bs,303,6);
swell_dir = ubits(bs,309,9);
sea_state = ubits(bs,318,4);
water_temp = ubits(bs,322,10) / 10. - 10; // FIX: please be right for -10.0 to +50.0
precip_type = ubits(bs,332,3);
salinity = ubits(bs,335,9);
ice = ubits(bs,344,2);
extended_water_level = ubits(bs,346,6); // FIX: how to treat this???
}
void Ais8_1_11::print() {
std::cout << "BBM_imo_1_11_met_hydro: " << message_id
<< "\t\tdac: " << dac << "\tfi:" << fi << "\n";
std::cout << "\tspare:" << spare << "\n"
<< "\tlocation:" << x << " " << y << "\t(lon, lat WGS84)" << "\n"
<< "\ttime:" << day << "T" << hour << ":" << minute << "Z\n"
<< "\twind:" << wind_ave << " " << wind_dir << "\n"
<< "\tgust:" << wind_gust << " " << wind_gust_dir << "\n"
<< "\tair_temp:" << air_temp << "\thumidity:" << rel_humid << "\t:" << horz_vis << "\n"
<< "\tdew_point:" << dew_point << "\tair_pres:" << air_pres << " trend: " << air_pres_trend << "\n"
<< "\twater_level:" << water_level << " trend: " << water_level_trend << "\n"
<< "\tcurrent:" << surf_cur_speed << " kts dir: " << surf_cur_dir << "\n"
<< "\tcurr2:" << cur_speed_2 << " kts dir: " << cur_dir_2 << "\t " << cur_depth_2 << " m deep\n"
<< "\tcurr3:" << cur_speed_3 << " kts dir: " << cur_dir_3 << "\t " << cur_depth_3 << " m deep\n"
<< "\twaves:" << wave_height << " " << wave_period << " " << wave_dir << "\n"
<< "\tswell:" << swell_height << " " << swell_period << " " << swell_dir << "\n"
<< "\tsea_state:" << sea_state << "\twater_temp:" << water_temp << "\n"
<< "\tprecip_type:" << precip_type << "\tsalinity:" << salinity << "\n"
<< "\tice:" << ice << "\n"
<< "\tspare_or_extended_wl:" << extended_water_level << std::endl;
}