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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 "STIDecoder.hpp"
#include "buffer_unpack.hpp"
#include "crc.h"
#include "Log.h"
#include <cstdio>
#include <cassert>
#include <sstream>
namespace EdiDecoder {
using namespace std;
STIDecoder::STIDecoder(STIDataCollector& data_collector, bool verbose) :
m_data_collector(data_collector),
m_dispatcher(std::bind(&STIDecoder::packet_completed, this), verbose)
{
using std::placeholders::_1;
using std::placeholders::_2;
m_dispatcher.register_tag("*ptr",
std::bind(&STIDecoder::decode_starptr, this, _1, _2));
m_dispatcher.register_tag("dsti",
std::bind(&STIDecoder::decode_dsti, this, _1, _2));
m_dispatcher.register_tag("ss",
std::bind(&STIDecoder::decode_ssn, this, _1, _2));
m_dispatcher.register_tag("*dmy",
std::bind(&STIDecoder::decode_stardmy, this, _1, _2));
m_dispatcher.register_tag("ODRa",
std::bind(&STIDecoder::decode_odraudiolevel, this, _1, _2));
m_dispatcher.register_tag("ODRv",
std::bind(&STIDecoder::decode_odrversion, this, _1, _2));
}
void STIDecoder::push_bytes(const vector<uint8_t> &buf)
{
m_dispatcher.push_bytes(buf);
}
void STIDecoder::push_packet(const vector<uint8_t> &buf)
{
m_dispatcher.push_packet(buf);
}
void STIDecoder::setMaxDelay(int num_af_packets)
{
m_dispatcher.setMaxDelay(num_af_packets);
}
#define AFPACKET_HEADER_LEN 10 // includes SYNC
bool STIDecoder::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 STIDecoder::decode_dsti(const vector<uint8_t> &value, uint16_t)
{
size_t offset = 0;
const uint16_t dstiHeader = read_16b(value.begin() + offset);
offset += 2;
sti_management_data md;
md.stihf = (dstiHeader >> 15) & 0x1;
md.atstf = (dstiHeader >> 14) & 0x1;
md.rfadf = (dstiHeader >> 13) & 0x1;
uint8_t dfcth = (dstiHeader >> 8) & 0x1F;
uint8_t dfctl = dstiHeader & 0xFF;
md.dflc = dfcth * 250 + dfctl; // modulo 5000 counter
const size_t expected_length = 2 +
(md.stihf ? 3 : 0) +
(md.atstf ? 1 + 4 + 3 : 0) +
(md.rfadf ? 9 : 0);
if (value.size() != expected_length) {
throw std::runtime_error("EDI dsti: decoding error:"
"value.size() != expected_length: " +
to_string(value.size()) + " " +
to_string(expected_length));
}
if (md.stihf) {
const uint8_t stat = value[offset++];
const uint16_t spid = read_16b(value.begin() + offset);
m_data_collector.update_stat(stat, spid);
offset += 2;
}
if (md.atstf) {
uint8_t utco = value[offset];
offset++;
uint32_t seconds = read_32b(value.begin() + offset);
offset += 4;
m_data_collector.update_edi_time(utco, seconds);
md.tsta = read_24b(value.begin() + offset);
offset += 3;
}
else {
// Null timestamp, ETSI ETS 300 799, C.2.2
md.tsta = 0xFFFFFF;
}
if (md.rfadf) {
std::array<uint8_t, 9> rfad;
copy(value.cbegin() + offset,
value.cbegin() + offset + 9,
rfad.begin());
offset += 9;
m_data_collector.update_rfad(rfad);
}
m_data_collector.update_sti_management(md);
return true;
}
bool STIDecoder::decode_ssn(const vector<uint8_t> &value, uint16_t n)
{
sti_payload_data sti;
sti.stream_index = n - 1; // n is 1-indexed
sti.rfa = value[0] >> 3;
sti.tid = value[0] & 0x07;
uint16_t istc = read_24b(value.begin() + 1);
sti.tidext = istc >> 13;
sti.crcstf = (istc >> 12) & 0x1;
sti.stid = istc & 0xFFF;
if (sti.rfa != 0) {
etiLog.level(warn) << "EDI: rfa field in SSnn tag non-null";
}
copy( value.cbegin() + 3,
value.cend(),
back_inserter(sti.istd));
m_data_collector.add_payload(move(sti));
return true;
}
bool STIDecoder::decode_stardmy(const vector<uint8_t>& /*value*/, uint16_t)
{
return true;
}
bool STIDecoder::decode_odraudiolevel(const vector<uint8_t>& value, uint16_t)
{
constexpr size_t expected_length = 2 * sizeof(int16_t);
audio_level_data audio_level;
if (value.size() == expected_length) {
audio_level.left = read_16b(value.begin());
audio_level.right = read_16b(value.begin() + 2);
}
else {
audio_level.left = 0;
audio_level.right = 0;
etiLog.level(warn) << "EDI: ODR AudioLevel TAG has wrong length!";
}
m_data_collector.update_audio_levels(audio_level);
// Not being able to decode the audio level is a soft-failure, it should
// not disrupt decoding the actual audio data.
return true;
}
bool STIDecoder::decode_odrversion(const vector<uint8_t>& value, uint16_t)
{
const auto vd = parse_odr_version_data(value);
m_data_collector.update_odr_version(vd);
return true;
}
void STIDecoder::packet_completed()
{
m_data_collector.assemble();
}
}
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