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gr-satnogs
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Code Issues Releases Wiki Activity

Syncing works

This commit is contained in:
Sebastian 2018-01-02 22:42:51 +01:00
parent 9d1567ac3d
commit db8d2a5eb2
2 changed files with 104 additions and 27 deletions
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118
lib/noaa_apt_sink_impl.cc
View File

@ -31,6 +31,28 @@ namespace gr
{
namespace satnogs
{
const bool SYNCA_SEQ[] = {false, false, false, false,
true, true, false, false, // Pulse 1
true, true, false, false, // Pulse 2
true, true, false, false, // Pulse 3
true, true, false, false, // Pulse 4
true, true, false, false, // Pulse 5
true, true, false, false, // Pulse 6
true, true, false, false, // Pulse 7
false, false, false, false,
false, false, false, false};
const bool SYNCB_SEQ[] = {false, false, false, false,
true, true, true, false, false,
true, true, true, false, false,
true, true, true, false, false,
true, true, true, false, false,
true, true, true, false, false,
true, true, true, false, false,
true, true, true, false, false,
false};
noaa_apt_sink::sptr
noaa_apt_sink::make (const char *filename_png, size_t width, size_t height,
@ -61,7 +83,8 @@ namespace gr
d_current_y (0),
d_num_images (0),
f_max_level(0.0),
f_min_level(1.0)
f_min_level(1.0),
f_average(0.0)
{
set_history(d_history_length);
init_images();
@ -121,33 +144,58 @@ namespace gr
write_images();
}
void noaa_apt_sink_impl::end_line () {
d_current_y += 1;
d_current_x = 0;
if(d_current_y % 100 == 0) {
write_images();
}
void noaa_apt_sink_impl::set_pixel (size_t x, size_t y, float sample) {
sample = (sample - f_min_level) / (f_max_level - f_min_level) * 255;
d_full_image.set_pixel(x, y, sample);
if(d_current_y >= d_height) {
d_current_y = 0;
d_num_images += 1;
write_images();
init_images();
if(d_split) {
if(x < d_width / 2) {
d_left_image.set_pixel(x, y, sample);
}
else {
d_right_image.set_pixel(x - d_width / 2, y, sample);
}
}
}
void noaa_apt_sink_impl::set_pixel (float sample) {
sample = (sample - f_min_level) / (f_max_level - f_min_level) * 255;
d_full_image.set_pixel(d_current_x, d_current_y, sample);
void
noaa_apt_sink_impl::skip_to (size_t new_x, size_t pos, const float *samples) {
if(new_x > d_current_x) {
size_t dist = std::min(size_t(39), new_x - d_current_x);
for(size_t i = 0; i < dist; i++) {
set_pixel(new_x - dist + i, d_current_y, samples[pos - dist + i]);
}
}
d_current_x = new_x;
}
if(d_split) {
if(d_current_x < d_width / 2) {
d_left_image.set_pixel(d_current_x, d_current_y, sample);
noaa_apt_sync_marker
noaa_apt_sink_impl::is_marker(size_t pos, const float *samples) {
size_t count_a = 0;
size_t count_b = 0;
for(size_t i = 0; i < 40; i++) {
float sample = samples[pos - 39 + i];
sample = sample - f_average;
if((sample > 0 && SYNCA_SEQ[i]) || (sample < 0 && !SYNCA_SEQ[i])) {
count_a += 1;
}
else {
d_right_image.set_pixel(d_current_x - d_width / 2, d_current_y, sample);
if((sample > 0 && SYNCB_SEQ[i]) || (sample < 0 && !SYNCB_SEQ[i])) {
count_b += 1;
}
}
if(count_a > 35) {
return noaa_apt_sync_marker::SYNC_A;
}
else if(count_b > 35) {
return noaa_apt_sync_marker::SYNC_B;
}
else {
return noaa_apt_sync_marker::NONE;
}
}
@ -161,14 +209,38 @@ namespace gr
for (size_t i = d_history_length - 1; i < noutput_items + d_history_length - 1; i++) {
float sample = in[i];
f_min_level = std::fmin(f_min_level, sample);
f_max_level = std::fmax(f_max_level, sample);
f_min_level = std::fmin(f_min_level, sample);
set_pixel(sample);
f_average = 0.25 * sample + 0.75 * f_average;
if(d_synchronize_opt) {
if(is_marker(i, in) == noaa_apt_sync_marker::SYNC_A) {
skip_to(39, i, in);
}
else if(is_marker(i, in) == noaa_apt_sync_marker::SYNC_B) {
skip_to(d_width / 2 + 39, i, in);
}
}
set_pixel(d_current_x, d_current_y, sample);
d_current_x += 1;
if(d_current_x >= d_width) {
end_line();
d_current_y += 1;
d_current_x = 0;
if(d_current_y % 100 == 0) {
write_images();
}
if(d_current_y >= d_height) {
d_current_y = 0;
d_num_images += 1;
write_images();
init_images();
}
}
}

13
lib/noaa_apt_sink_impl.h
View File

@ -32,6 +32,7 @@ namespace gr
{
namespace satnogs
{
enum class noaa_apt_sync_marker {SYNC_A, SYNC_B, NONE};
class noaa_apt_sink_impl : public noaa_apt_sink
{
@ -44,7 +45,6 @@ namespace gr
bool d_flip;
size_t d_history_length;
size_t d_num_images;
png::image<png::gray_pixel> d_full_image;
png::image<png::gray_pixel> d_left_image;
png::image<png::gray_pixel> d_right_image;
@ -54,9 +54,11 @@ namespace gr
size_t d_current_x;
size_t d_current_y;
size_t d_num_images;
float f_max_level;
float f_min_level;
float f_average;
public:
noaa_apt_sink_impl (const char *filename_png, size_t width, size_t height,
@ -72,11 +74,14 @@ namespace gr
void
init_images ();
void
set_pixel (float sample);
noaa_apt_sync_marker
is_marker (size_t pos, const float *samples);
void
end_line ();
set_pixel (size_t x, size_t y, float sample);
void
skip_to (size_t new_x, size_t pos, const float *samples);
void
write_images ();