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FT8 demod: restore double precision for time variables

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This commit is contained in:
f4exb 2023-01-08 21:41:43 +01:00
parent 902e58b46b
commit 6594bf209e
6 changed files with 122 additions and 91 deletions
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18
ft8/fft.cpp
View File

@ -62,7 +62,7 @@ public:
// how much CPU time spent in FFTs that use this plan.
#if TIMING
float time_;
double time_;
#endif
const char *why_;
int uses_;
@ -100,7 +100,7 @@ Plan *get_plan(int n, const char *why)
}
}
float t0 = now();
double t0 = now();
// fftw_make_planner_thread_safe();
@ -172,7 +172,7 @@ Plan *get_plan(int n, const char *why)
if (0 && getpid() == plan_master_pid)
{
float t1 = now();
double t1 = now();
fprintf(stderr, "miss pid=%d master=%d n=%d t=%.3f total=%d type=%d, %s\n",
getpid(), plan_master_pid, n, t1 - t0, nplans, type, why);
}
@ -213,7 +213,7 @@ std::vector<std::complex<float>> one_fft(
fftwf_plan m_plan = p->fwd_;
#if TIMING
float t0 = now();
double t0 = now();
#endif
assert((int)samples.size() - i0 >= block);
@ -287,7 +287,7 @@ ffts_t ffts(const std::vector<float> &samples, int i0, int block, const char *wh
fftwf_plan m_plan = p->fwd_;
#if TIMING
float t0 = now();
double t0 = now();
#endif
// allocate our own b/c using p->m_in and p->m_out isn't thread-safe.
@ -356,7 +356,7 @@ std::vector<std::complex<float>> one_fft_c(
fftwf_plan m_plan = p->cfwd_;
#if TIMING
float t0 = now();
double t0 = now();
#endif
fftwf_complex *m_in = (fftwf_complex *)fftwf_malloc(block * sizeof(fftwf_complex));
@ -416,7 +416,7 @@ std::vector<std::complex<float>> one_fft_cc(
fftwf_plan m_plan = p->cfwd_;
#if TIMING
float t0 = now();
double t0 = now();
#endif
fftwf_complex *m_in = (fftwf_complex *)fftwf_malloc(block * sizeof(fftwf_complex));
@ -472,7 +472,7 @@ std::vector<std::complex<float>> one_ifft_cc(
fftwf_plan m_plan = p->crev_;
#if TIMING
float t0 = now();
double t0 = now();
#endif
fftwf_complex *m_in = (fftwf_complex *)fftwf_malloc(block * sizeof(fftwf_complex));
@ -519,7 +519,7 @@ std::vector<float> one_ifft(const std::vector<std::complex<float>> &bins, const
fftwf_plan m_plan = p->rev_;
#if TIMING
float t0 = now();
double t0 = now();
#endif
fftwf_complex *m_in = (fftwf_complex *)fftwf_malloc(sizeof(fftwf_complex) * ((p->n_ / 2) + 1));

160
ft8/ft8.cpp
View File

@ -595,8 +595,8 @@ public:
int start_; // sample number of 0.5 seconds into samples[]
int rate_; // samples/second
float deadline_; // start time + budget
float final_deadline_; // keep going this long if no decodes
double deadline_; // start time + budget
double final_deadline_; // keep going this long if no decodes
std::vector<int> hints1_;
std::vector<int> hints2_;
int pass_;
@ -617,13 +617,19 @@ public:
Plan *plan32_;
FT8(const std::vector<float> &samples,
FT8(
const std::vector<float> &samples,
float min_hz,
float max_hz,
int start, int rate,
int hints1[], int hints2[], float deadline,
float final_deadline, cb_t cb,
std::vector<cdecode> prevdecs)
int start,
int rate,
int hints1[],
int hints2[],
double deadline,
double final_deadline,
cb_t cb,
std::vector<cdecode> prevdecs
)
{
samples_ = samples;
min_hz_ = min_hz;
@ -636,12 +642,11 @@ public:
cb_ = cb;
down_hz_ = 0;
for (int i = 0; hints1[i]; i++)
{
for (int i = 0; hints1[i]; i++) {
hints1_.push_back(hints1[i]);
}
for (int i = 0; hints2[i]; i++)
{
for (int i = 0; hints2[i]; i++) {
hints2_.push_back(hints2[i]);
}
@ -676,6 +681,7 @@ public:
float mx;
int mxi = -1;
float sum = 0;
for (int i = 0; i < 8; i++)
{
float x = std::abs(bins[si0 + si][bi0 + i]);
@ -686,6 +692,7 @@ public:
mx = x;
}
}
if (si >= 0 && si < 7)
{
float x = std::abs(bins[si0 + si][bi0 + costas[si - 0]]);
@ -723,12 +730,10 @@ public:
x += std::abs(bins[si0 + si][bi0 + bi]);
x += std::abs(bins[si0 + 36 + si][bi0 + bi]);
x += std::abs(bins[si0 + 72 + si][bi0 + bi]);
if (bi == costas[si])
{
if (bi == costas[si]) {
sig += x;
}
else
{
} else {
noise += x;
}
}
@ -952,17 +957,19 @@ public:
144000, 145800, 216000, 218700,
0};
int nice = -1;
for (int i = 0; nice_sizes[i]; i++)
{
int sz = nice_sizes[i];
if (fabs(samples_.size() - sz) < 0.05 * samples_.size())
{
nice = sz;
break;
}
}
if (nice != -1)
{
if (nice != -1) {
samples_.resize(nice);
}
@ -986,16 +993,21 @@ public:
{
// filter and reduce the sample rate from rate_ to nrate.
float t0 = now();
double t0 = now();
int osize = samples_.size();
float delta_hz; // how much it moved down
samples_ = reduce_rate(samples_,
samples_ = reduce_rate(
samples_,
min_hz_ - 3.1 - go_extra,
max_hz_ + 50 - 3.1 + go_extra,
rate_, nrate, delta_hz);
rate_,
nrate,
delta_hz
);
double t1 = now();
float t1 = now();
if (t1 - t0 > 0.1)
{
fprintf(stderr, "reduce oops, size %d -> %d, rate %d -> %d, took %.2f\n",
@ -1005,6 +1017,7 @@ public:
nrate,
t1 - t0);
}
if (0)
{
fprintf(stderr, "%.0f..%.0f, range %.0f, rate %d -> %d, delta hz %.0f, %.6f sec\n",
@ -1024,6 +1037,7 @@ public:
prevdecs_[i].hz1 -= delta_hz;
}
}
assert(max_hz_ + 50 < nrate / 2);
assert(min_hz_ >= 0);
@ -1055,21 +1069,26 @@ public:
// v[i] = 0;
v[i] = samples_[rnd()];
}
samples_.insert(samples_.end(), v.begin(), v.end());
}
int si0 = (start_ - tminus * rate_) / block;
if (si0 < 0)
if (si0 < 0) {
si0 = 0;
}
int si1 = (start_ + tplus * rate_) / block;
// a copy from which to subtract.
nsamples_ = samples_;
int any = 0;
for (int i = 0; i < (int)prevdecs_.size(); i++)
{
auto d = prevdecs_[i];
if (d.hz0 >= min_hz_ && d.hz0 <= max_hz_)
{
// reconstruct correct 79 symbols from LDPC output.
@ -1088,21 +1107,21 @@ public:
any += 1;
}
}
if (any)
{
if (any) {
samples_ = nsamples_;
}
for (pass_ = 0; pass_ < npasses; pass_++)
{
float total_remaining = deadline_ - now();
float remaining = total_remaining / (npasses - pass_);
if (pass_ == 0)
{
double total_remaining = deadline_ - now();
double remaining = total_remaining / (npasses - pass_);
if (pass_ == 0) {
remaining *= pass0_frac;
}
float deadline = now() + remaining;
double deadline = now() + remaining;
int new_decodes = 0;
samples_ = nsamples_;
@ -1154,35 +1173,42 @@ public:
{ return a.strength_ > b.strength_; });
char already[2000]; // XXX
for (int i = 0; i < (int)(sizeof(already) / sizeof(already[0])); i++)
for (int i = 0; i < (int)(sizeof(already) / sizeof(already[0])); i++) {
already[i] = 0;
}
for (int ii = 0; ii < (int)order.size(); ii++)
{
float tt = now();
double tt = now();
if (ii > 0 &&
tt > deadline &&
(tt > deadline_ || new_decodes >= pass_threshold) &&
(pass_ < npasses - 1 || tt > final_deadline_))
{
(pass_ < npasses - 1 || tt > final_deadline_)
) {
break;
}
float hz = order[ii].hz_;
if (already[(int)round(hz / already_hz)])
if (already[(int)round(hz / already_hz)]) {
continue;
}
int off = order[ii].off_;
int ret = one(bins, samples_.size(), hz, off);
if (ret)
{
if (ret == 2)
{
if (ret == 2) {
new_decodes++;
}
already[(int)round(hz / already_hz)] = 1;
}
}
}
} // pass
}
//
@ -3598,12 +3624,9 @@ public:
int correct_bits = 0;
for (int i = 0; i < 174; i++)
{
if (ll174[i] < 0 && a174[i] == 1)
{
if (ll174[i] < 0 && a174[i] == 1) {
correct_bits += 1;
}
else if (ll174[i] > 0 && a174[i] == 0)
{
} else if (ll174[i] > 0 && a174[i] == 0) {
correct_bits += 1;
}
}
@ -3615,9 +3638,15 @@ public:
{
// fine-tune offset and hz for better subtraction.
float best_off = best_off_samples / 200.0;
search_both_known(samples200, 200, re79,
best_hz, best_off,
best_hz, best_off);
search_both_known(
samples200,
200,
re79,
best_hz,
best_off,
best_hz,
best_off
);
best_off_samples = round(best_off * 200.0);
}
@ -3629,9 +3658,15 @@ public:
if (do_third == 2)
{
// fine-tune offset and hz for better subtraction.
search_both_known(samples_, rate_, re79,
best_hz, best_off,
best_hz, best_off);
search_both_known(
samples_,
rate_,
re79,
best_hz,
best_off,
best_hz,
best_off
);
}
float snr = guess_snr(m79);
@ -3639,9 +3674,18 @@ public:
if (cb_ != 0)
{
cb_mu_.lock();
int ret = cb_(a174, best_hz + down_hz_, best_hz + down_hz_,
best_off, comment.c_str(), snr, pass_, correct_bits);
int ret = cb_(
a174,
best_hz + down_hz_,
best_off,
comment.c_str(),
snr,
pass_,
correct_bits
);
cb_mu_.unlock();
if (ret == 2)
{
// a new decode. subtract it from nsamples_.
@ -3650,6 +3694,7 @@ public:
return ret;
}
return 1;
}
else
@ -3714,16 +3759,16 @@ void entry(
float max_hz,
int hints1[],
int hints2[],
float time_left,
float total_time_left,
double time_left,
double total_time_left,
cb_t cb,
int nprevdecs,
struct cdecode *xprevdecs
)
{
float t0 = now();
float deadline = t0 + time_left;
float final_deadline = t0 + total_time_left;
double t0 = now();
double deadline = t0 + time_left;
double final_deadline = t0 + total_time_left;
// decodes from previous runs, for subtraction.
std::vector<cdecode> prevdecs;
@ -3778,7 +3823,6 @@ void entry(
);
int npasses = nprevdecs > 0 ? npasses_two : npasses_one;
printf("FT8::entry: npasses: %d\n", npasses);
ft8->th_ = new std::thread([ft8, npasses] () { ft8->go(npasses); });

5
ft8/ft8.h
View File

@ -26,7 +26,6 @@ namespace FT8 {
typedef int (*cb_t)(
int *a91,
float hz0,
float hz1,
float off,
const char *,
float snr,
@ -52,8 +51,8 @@ void entry(
float max_hz,
int hints1[],
int hints2[],
float time_left,
float total_time_left,
double time_left,
double total_time_left,
cb_t cb,
int,
struct cdecode *

2
ft8/util.cpp
View File

@ -30,7 +30,7 @@
namespace FT8 {
float now()
double now()
{
struct timeval tv;
gettimeofday(&tv, 0);

2
ft8/util.h
View File

@ -26,7 +26,7 @@
namespace FT8
{
float now();
double now();
void writewav(const std::vector<float> &samples, const char *filename, int rate);
std::vector<float> readwav(const char *filename, int &rate_out);
void writetxt(std::vector<float> v, const char *filename);

22
sdrbench/test_ft8.cpp
View File

@ -32,24 +32,17 @@ void MainBench::testFT8()
#else
QMutex cycle_mu;
volatile int cycle_count;
time_t saved_cycle_start;
std::map<std::string, bool> cycle_already;
int hcb(
int *a91,
float hz0,
float hz1,
float off,
const char *comment,
float snr,
int pass,
int correct_bits)
{
(void) hz1;
(void) comment;
(void) pass;
std::string msg = FT8::unpack(a91);
cycle_mu.lock();
@ -62,22 +55,17 @@ int hcb(
}
cycle_already[msg] = true;
cycle_count += 1;
cycle_mu.unlock();
struct tm result;
gmtime_r(&saved_cycle_start, &result);
printf("%02d%02d%02d %3d %3d %5.2f %6.1f %s\n",
result.tm_hour,
result.tm_min,
result.tm_sec,
printf("%d %3d %3d %5.2f %6.1f %s, %s\n",
pass,
(int)snr,
correct_bits,
off - 0.5,
hz0,
msg.c_str());
msg.c_str(),
comment);
fflush(stdout);
return 2; // 2 => new decode, do subtract.
@ -87,7 +75,7 @@ void MainBench::testFT8()
{
qDebug("MainBench::testFT8: start");
int hints[2] = { 2, 0 }; // CQ
double budget = 5; // compute for this many seconds per cycle
double budget = 2.5; // compute for this many seconds per cycle
int rate;
std::vector<float> s = FT8::readwav("/home/f4exb/.local/share/WSJT-X/save/230105_091630.wav", rate); // FIXME: download file