Cheetah - SKA - PSS - Prototype Time Domain Search Pipeline
UdpStream.cpp
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24 #include "cheetah/rcpt_low/UdpStream.h"
25 #include "cheetah/rcpt_low/BeamFormerPacket.h"
26 #include "panda/Log.h"
27 #include <iostream>
28 #include <algorithm>
29 
30 
31 namespace ska {
32 namespace cheetah {
33 namespace rcpt_low {
34 
35 template<typename Producer>
36 UdpStreamTmpl<Producer>::UdpStreamTmpl(Config const& config)
37  //: BaseT(config.engine(), ConnectionTraits::SocketType(config.engine(), config.local_end_point()))
38  : BaseT(config.engine(), ConnectionTraits::SocketType(config.engine(), config.remote_end_point()))
39  , _n_channels(config.number_of_channels())
40  , _n_samples(config.spectra_per_chunk())
41 {
42 }
43 
44 template<typename Producer>
45 UdpStreamTmpl<Producer>::~UdpStreamTmpl()
46 {
47 }
48 
49 template<typename Producer>
51 {
52  this->BaseT::init();
53  this->start();
54 }
55 
56 
57 template<typename Producer>
58 template<typename DataType>
59 std::shared_ptr<DataType> UdpStreamTmpl<Producer>::get_chunk(unsigned , PacketInspector const& packet)
60 {
61  auto chunk = BaseT::template get_chunk<DataType>();
62  if(chunk) {
63  chunk->resize( _n_samples, _n_channels);
64  }
65  const UdpStreamTmpl<Producer>::TsampType fraction = ((double)(packet.packet().timestamp_attoseconds()*1e-18)*ska::cheetah::data::seconds);
66  const UdpStreamTmpl<Producer>::TsampType seconds = ((double)(packet.packet().timestamp_seconds())*ska::cheetah::data::seconds);
67  const std::chrono::time_point<std::chrono::system_clock> system_epoch;
68  chunk->start_time(ska::cheetah::utils::ModifiedJulianClock::time_point(system_epoch+seconds+fraction));
69 
70  UdpStreamTmpl<Producer>::FrequencyType fch1 = packet.packet().first_channel_frequency();
71  UdpStreamTmpl<Producer>::FrequencyType bandwidth = (((double)std::ceil((packet.packet().channel_separation()*1e-9)*number_of_channels_low))*boost::units::si::mega * ska::cheetah::data::hertz);
72  UdpStreamTmpl<Producer>::FrequencyType foff = (-1.0*static_cast<UdpStreamTmpl<Producer>::FrequencyType>(bandwidth).value()/(double)number_of_channels_low)*boost::units::si::mega * ska::cheetah::data::hertz;
73  chunk->sample_interval(TimeType(((double)number_of_channels_low/static_cast<UdpStreamTmpl<Producer>::FrequencyType>(bandwidth).value())*1e-6 * ska::cheetah::data::seconds));
74  chunk->set_channel_frequencies_const_width(fch1, foff);
75  return chunk;
76 }
77 
78 
79 } // namespace rcpt_low
80 } // namespace cheetah
81 } // namespace ska
Some limits and constants for FLDO.
Definition: Brdz.h:35
The UDP stream from the BeamFormer.
Definition: UdpStream.h:47
BeamFormerPacket inspection and data extraction.