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FT8 demod: implemented decoder

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This commit is contained in:
f4exb
2023-01-19 23:51:43 +01:00
parent 0d77b37ec1
commit b1cf15213c
22 changed files with 968 additions and 72 deletions
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ft8/unpack.cpp
+60 -49
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@@ -27,19 +27,17 @@
namespace FT8 {
int Packing::ihashcall(std::string call, int m)
int Packing::ihashcall(std::string rawcall, int m)
{
while (call.size() > 0 && call[0] == ' ')
call.erase(0, 1);
while (call.size() > 0 && call[call.size() - 1] == ' ')
call.erase(call.end() - 1);
std::string call = trim(rawcall);
const char *chars = " 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ/";
while (call.size() < 11)
while (call.size() < 11) {
call += " ";
}
unsigned long long x = 0;
for (int i = 0; i < 11; i++)
{
int c = call[i];
@@ -48,6 +46,7 @@ int Packing::ihashcall(std::string call, int m)
int j = p - chars;
x = 38 * x + j;
}
x = x * 47055833459LL;
x = x >> (64 - m);
@@ -66,17 +65,24 @@ std::string Packing::unpackcall(int x)
const char *c3 = "0123456789";
const char *c4 = " ABCDEFGHIJKLMNOPQRSTUVWXYZ";
if (x == 0)
if (x == 0) {
return "DE";
if (x == 1)
}
if (x == 1) {
return "QRZ";
if (x == 2)
}
if (x == 2) {
return "CQ";
}
if (x <= 1002)
{
sprintf(tmp, "CQ %d", x - 3);
return tmp;
return std::string(tmp);
}
if (x <= 532443)
{
x -= 1003;
@@ -88,11 +94,10 @@ std::string Packing::unpackcall(int x)
x %= 27;
int ci4 = x;
sprintf(tmp, "CQ %c%c%c%c", c4[ci1], c4[ci2], c4[ci3], c4[ci4]);
return tmp;
return std::string(tmp);
}
if (x < NTOKENS)
{
if (x < NTOKENS) {
return "<TOKEN>";
}
@@ -103,14 +108,13 @@ std::string Packing::unpackcall(int x)
// 22-bit hash...
std::string s;
hashes_mu.lock();
if (hashes22.count(x) > 0)
{
if (hashes22.count(x) > 0) {
s = hashes22[x];
}
else
{
} else {
s = "<...22>";
}
hashes_mu.unlock();
return s;
}
@@ -133,7 +137,7 @@ std::string Packing::unpackcall(int x)
a[6] = '\0';
return a;
return std::string(a);
}
// unpack a 15-bit grid square &c.
@@ -172,44 +176,41 @@ std::string Packing::unpackgrid(int ng, int ir, int i3)
ng -= NGBASE;
if (ng == 1)
{
if (ng == 1) {
return " "; // ???
}
if (ng == 2)
{
if (ng == 2) {
return "RRR ";
}
if (ng == 3)
{
if (ng == 3) {
return "RR73";
}
if (ng == 4)
{
if (ng == 4) {
return "73 ";
}
int db = ng - 35;
char tmp[16];
if (db >= 0)
{
if (db >= 0) {
sprintf(tmp, "%s+%02d", ir ? "R" : "", db);
}
else
{
} else {
sprintf(tmp, "%s-%02d", ir ? "R" : "", 0 - db);
}
return tmp;
return std::string(tmp);
}
void Packing::remember_call(std::string call)
{
hashes_mu.lock();
if (call.size() >= 3 && call[0] != '<')
{
hashes22[ihashcall(call, 22)] = call;
hashes12[ihashcall(call, 12)] = call;
}
hashes_mu.unlock();
}
@@ -236,11 +237,14 @@ std::string Packing::unpack_4(int a77[], std::string& call1str, std::string& cal
}
call[11] = '\0';
std::string callstr(call);
remember_call(call);
remember_call(callstr);
if (un64(a77, 73, 1) == 1) {
return std::string("CQ ") + call;
if (un64(a77, 73, 1) == 1)
{
call1str = std::string("CQ ") + callstr;
return call1str;
}
int x12 = un64(a77, 0, 12);
@@ -255,7 +259,6 @@ std::string Packing::unpack_4(int a77[], std::string& call1str, std::string& cal
}
hashes_mu.unlock();
int swap = un64(a77, 70, 1);
std::string msg;
@@ -274,14 +277,16 @@ std::string Packing::unpack_4(int a77[], std::string& call1str, std::string& cal
int suffix = un64(a77, 71, 2);
if (suffix == 1) {
msg += " RRR";
if (suffix == 1)
{
locstr = " RRR";
} else if (suffix == 2) {
msg += " RR73";
locstr = " RR73";
} else if (suffix == 3) {
msg += " 73";
locstr = " 73";
}
msg += locstr;
return msg;
}
@@ -323,7 +328,7 @@ std::string Packing::unpack_1(int a77[], std::string& call1str, std::string& cal
remember_call(call1str);
remember_call(call2str);
const char *pr = (i3 == 1 ? "/R" : "/P");
const std::string pr = (i3 == 1 ? "/R" : "/P");
return call1str + (rover1 ? pr : "") + " " + call2str + (rover2 ? pr : "") + " " + locstr;
}
@@ -340,11 +345,13 @@ std::string Packing::unpack_0_0(int a77[], std::string& call1str, std::string& c
const char *cc = " 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ+-./?";
boost::multiprecision::int128_t x = un128(a77, 0, 71);
std::string msg = "0123456789123";
for (int i = 0; i < 13; i++)
{
msg[13 - 1 - i] = cc[(int) (x % 42)];
x = x / 42;
}
call1str = msg;
return msg;
}
@@ -392,6 +399,7 @@ std::string Packing::unpack_3(int a77[], std::string& call1str, std::string& cal
int statei = serial - 8001;
std::string serialstr;
int nstates = sizeof(ru_states) / sizeof(ru_states[0]);
if (serial > 8000 && statei < nstates)
{
serialstr = ru_states[statei];
@@ -400,16 +408,17 @@ std::string Packing::unpack_3(int a77[], std::string& call1str, std::string& cal
{
char tmp[32];
sprintf(tmp, "%04d", serial);
serialstr = tmp;
serialstr = std::string(tmp);
}
std::string msg;
if (tu)
{
if (tu) {
msg += "TU; ";
}
msg += call1str + " " + call2str + " ";
if (r)
{
msg += "R ";
@@ -417,8 +426,9 @@ std::string Packing::unpack_3(int a77[], std::string& call1str, std::string& cal
{
char tmp[16];
sprintf(tmp, "%d ", rst);
msg += tmp;
msg += std::string(tmp);
}
msg += serialstr;
remember_call(call1str);
@@ -479,7 +489,7 @@ std::string Packing::unpack_0_3(int a77[], int n3, std::string& call1str, std::s
{
char tmp[16];
sprintf(tmp, "%d%c ", n_transmitters + 1, clss + 'A');
msg += tmp;
msg += std::string(tmp);
}
if (section - 1 >= 0 && section - 1 < (int)(sizeof(sections) / sizeof(sections[0]))) {
@@ -531,8 +541,9 @@ std::string Packing::unpack(int a77[], std::string& call1, std::string& call2, s
}
char tmp[64];
call1 = "UNK";
sprintf(tmp, "UNK i3=%d n3=%d", i3, n3);
return tmp;
return std::string(tmp);
}
} // namespace FT8