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/*
Copyright (C) 2019
Matthias P. Braendli, matthias.braendli@mpb.li
http://opendigitalradio.org
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "ETIDecoder.hpp"
#include "buffer_unpack.hpp"
#include "crc.h"
#include "Log.h"
#include <cstdio>
#include <cassert>
#include <sstream>
namespace EdiDecoder {
using namespace std;
ETIDecoder::ETIDecoder(ETIDataCollector& data_collector, bool verbose) :
m_data_collector(data_collector),
m_dispatcher(std::bind(&ETIDecoder::packet_completed, this), verbose)
{
using std::placeholders::_1;
using std::placeholders::_2;
m_dispatcher.register_tag("*ptr",
std::bind(&ETIDecoder::decode_starptr, this, _1, _2));
m_dispatcher.register_tag("deti",
std::bind(&ETIDecoder::decode_deti, this, _1, _2));
m_dispatcher.register_tag("est",
std::bind(&ETIDecoder::decode_estn, this, _1, _2));
m_dispatcher.register_tag("*dmy",
std::bind(&ETIDecoder::decode_stardmy, this, _1, _2));
}
void ETIDecoder::push_bytes(const vector<uint8_t> &buf)
{
m_dispatcher.push_bytes(buf);
}
void ETIDecoder::push_packet(const vector<uint8_t> &buf)
{
m_dispatcher.push_packet(buf);
}
void ETIDecoder::setMaxDelay(int num_af_packets)
{
m_dispatcher.setMaxDelay(num_af_packets);
}
#define AFPACKET_HEADER_LEN 10 // includes SYNC
bool ETIDecoder::decode_starptr(const vector<uint8_t> &value, uint16_t)
{
if (value.size() != 0x40 / 8) {
etiLog.log(warn, "Incorrect length %02lx for *PTR", value.size());
return false;
}
char protocol_sz[5];
protocol_sz[4] = '\0';
copy(value.begin(), value.begin() + 4, protocol_sz);
string protocol(protocol_sz);
uint16_t major = read_16b(value.begin() + 4);
uint16_t minor = read_16b(value.begin() + 6);
m_data_collector.update_protocol(protocol, major, minor);
return true;
}
bool ETIDecoder::decode_deti(const vector<uint8_t> &value, uint16_t)
{
/*
uint16_t detiHeader = fct | (fcth << 8) | (rfudf << 13) | (ficf << 14) | (atstf << 15);
packet.push_back(detiHeader >> 8);
packet.push_back(detiHeader & 0xFF);
*/
uint16_t detiHeader = read_16b(value.begin());
eti_fc_data fc;
fc.atstf = (detiHeader >> 15) & 0x1;
fc.ficf = (detiHeader >> 14) & 0x1;
bool rfudf = (detiHeader >> 13) & 0x1;
uint8_t fcth = (detiHeader >> 8) & 0x1F;
uint8_t fct = detiHeader & 0xFF;
fc.dflc = fcth * 250 + fct; // modulo 5000 counter
uint32_t etiHeader = read_32b(value.begin() + 2);
uint8_t stat = (etiHeader >> 24) & 0xFF;
fc.mid = (etiHeader >> 22) & 0x03;
fc.fp = (etiHeader >> 19) & 0x07;
uint8_t rfa = (etiHeader >> 17) & 0x3;
if (rfa != 0) {
etiLog.log(warn, "EDI deti TAG: rfa non-zero");
}
bool rfu = (etiHeader >> 16) & 0x1;
uint16_t mnsc = rfu ? 0xFFFF : etiHeader & 0xFFFF;
const size_t fic_length_words = (fc.ficf ? (fc.mid == 3 ? 32 : 24) : 0);
const size_t fic_length = 4 * fic_length_words;
const size_t expected_length = 2 + 4 +
(fc.atstf ? 1 + 4 + 3 : 0) +
fic_length +
(rfudf ? 3 : 0);
if (value.size() != expected_length) {
throw std::logic_error("EDI deti: Assertion error:"
"value.size() != expected_length: " +
to_string(value.size()) + " " +
to_string(expected_length));
}
m_data_collector.update_err(stat);
m_data_collector.update_mnsc(mnsc);
size_t i = 2 + 4;
if (fc.atstf) {
uint8_t utco = value[i];
i++;
uint32_t seconds = read_32b(value.begin() + i);
i += 4;
m_data_collector.update_edi_time(utco, seconds);
fc.tsta = read_24b(value.begin() + i);
i += 3;
}
else {
// Null timestamp, ETSI ETS 300 799, C.2.2
fc.tsta = 0xFFFFFF;
}
if (fc.ficf) {
vector<uint8_t> fic(fic_length);
copy( value.begin() + i,
value.begin() + i + fic_length,
fic.begin());
i += fic_length;
m_data_collector.update_fic(move(fic));
}
if (rfudf) {
uint32_t rfud = read_24b(value.begin() + i);
// high 16 bits: RFU in LIDATA EOH
// low 8 bits: RFU in TIST (not supported)
m_data_collector.update_rfu(rfud >> 8);
if ((rfud & 0xFF) != 0xFF) {
etiLog.level(warn) << "EDI: RFU in TIST not supported";
}
i += 3;
}
m_data_collector.update_fc_data(fc);
return true;
}
bool ETIDecoder::decode_estn(const vector<uint8_t> &value, uint16_t n)
{
uint32_t sstc = read_24b(value.begin());
eti_stc_data stc;
stc.stream_index = n - 1; // n is 1-indexed
stc.scid = (sstc >> 18) & 0x3F;
stc.sad = (sstc >> 8) & 0x3FF;
stc.tpl = (sstc >> 2) & 0x3F;
uint8_t rfa = sstc & 0x3;
if (rfa != 0) {
etiLog.level(warn) << "EDI: rfa field in ESTn tag non-null";
}
copy( value.begin() + 3,
value.end(),
back_inserter(stc.mst));
m_data_collector.add_subchannel(move(stc));
return true;
}
bool ETIDecoder::decode_stardmy(const vector<uint8_t>& /*value*/, uint16_t)
{
return true;
}
void ETIDecoder::packet_completed()
{
m_data_collector.assemble();
}
}
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