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-rw-r--r--lib/edi/PFT.cpp574
-rw-r--r--lib/edi/PFT.hpp166
-rw-r--r--lib/edi/STIDecoder.cpp191
-rw-r--r--lib/edi/STIDecoder.hpp122
-rw-r--r--lib/edi/STIWriter.cpp139
-rw-r--r--lib/edi/STIWriter.hpp84
-rw-r--r--lib/edi/buffer_unpack.hpp62
-rw-r--r--lib/edi/common.cpp323
-rw-r--r--lib/edi/common.hpp92
9 files changed, 1753 insertions, 0 deletions
diff --git a/lib/edi/PFT.cpp b/lib/edi/PFT.cpp
new file mode 100644
index 0000000..aff7929
--- /dev/null
+++ b/lib/edi/PFT.cpp
@@ -0,0 +1,574 @@
+/* ------------------------------------------------------------------
+ * Copyright (C) 2017 AVT GmbH - Fabien Vercasson
+ * Copyright (C) 2017 Matthias P. Braendli
+ * matthias.braendli@mpb.li
+ *
+ * http://opendigitalradio.org
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+ * express or implied.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ * -------------------------------------------------------------------
+ */
+
+#include <stdio.h>
+#include <cassert>
+#include <cstring>
+#include <sstream>
+#include <stdexcept>
+#include <algorithm>
+#include "crc.h"
+#include "PFT.hpp"
+#include "Log.h"
+#include "buffer_unpack.hpp"
+extern "C" {
+#include "fec/fec.h"
+}
+
+namespace EdiDecoder {
+namespace PFT {
+
+using namespace std;
+
+const findex_t NUM_AFBUILDERS_TO_KEEP = 10;
+
+static bool checkCRC(const uint8_t *buf, size_t size)
+{
+ const uint16_t crc_from_packet = read_16b(buf + size - 2);
+ uint16_t crc_calc = 0xffff;
+ crc_calc = crc16(crc_calc, buf, size - 2);
+ crc_calc ^= 0xffff;
+
+ return crc_from_packet == crc_calc;
+}
+
+class FECDecoder {
+ public:
+ FECDecoder() {
+ m_rs_handler = init_rs_char(
+ symsize, gfPoly, firstRoot, primElem, nroots, pad);
+ }
+ FECDecoder(const FECDecoder& other) = delete;
+ FECDecoder& operator=(const FECDecoder& other) = delete;
+ ~FECDecoder() {
+ free_rs_char(m_rs_handler);
+ }
+
+ // return -1 in case of failure, non-negative value if errors
+ // were corrected.
+ // Known positions of erasures should be given in eras_pos to
+ // improve decoding probability. After calling this function
+ // eras_pos will contain the positions of the corrected errors.
+ int decode(vector<uint8_t> &data, vector<int> &eras_pos) {
+ assert(data.size() == N);
+ const size_t no_eras = eras_pos.size();
+
+ eras_pos.resize(nroots);
+ int num_err = decode_rs_char(m_rs_handler, data.data(),
+ eras_pos.data(), no_eras);
+ if (num_err > 0) {
+ eras_pos.resize(num_err);
+ }
+ return num_err;
+ }
+
+ // return -1 in case of failure, non-negative value if errors
+ // were corrected. No known erasures.
+ int decode(vector<uint8_t> &data) {
+ assert(data.size() == N);
+ int num_err = decode_rs_char(m_rs_handler, data.data(), nullptr, 0);
+ return num_err;
+ }
+
+ private:
+ void* m_rs_handler;
+
+ const int firstRoot = 1; // Discovered by analysing EDI dump
+ const int gfPoly = 0x11d;
+
+ // The encoding has to be 255, 207 always, because the chunk has to
+ // be padded at the end, and not at the beginning as libfec would
+ // do
+ const size_t N = 255;
+ const size_t K = 207;
+ const int primElem = 1;
+ const int symsize = 8;
+ const size_t nroots = N - K; // For EDI PFT, this must be 48
+ const size_t pad = ((1 << symsize) - 1) - N; // is 255-N
+
+};
+
+size_t Fragment::loadData(const std::vector<uint8_t> &buf)
+{
+ const size_t header_len = 14;
+ if (buf.size() < header_len) {
+ return 0;
+ }
+
+ size_t index = 0;
+
+ // Parse PFT Fragment Header (ETSI TS 102 821 V1.4.1 ch7.1)
+ if (not (buf[0] == 'P' and buf[1] == 'F') ) {
+ throw invalid_argument("Invalid PFT SYNC bytes");
+ }
+ index += 2; // Psync
+
+ _Pseq = read_16b(buf.begin()+index); index += 2;
+ _Findex = read_24b(buf.begin()+index); index += 3;
+ _Fcount = read_24b(buf.begin()+index); index += 3;
+ _FEC = unpack1bit(buf[index], 0);
+ _Addr = unpack1bit(buf[index], 1);
+ _Plen = read_16b(buf.begin()+index) & 0x3FFF; index += 2;
+
+ const size_t required_len = header_len +
+ (_FEC ? 1 : 0) +
+ (_Addr ? 2 : 0) +
+ 2; // CRC
+ if (buf.size() < required_len) {
+ return 0;
+ }
+
+ // Optional RS Header
+ _RSk = 0;
+ _RSz = 0;
+ if (_FEC) {
+ _RSk = buf[index]; index += 1;
+ _RSz = buf[index]; index += 1;
+ }
+
+ // Optional transport header
+ _Source = 0;
+ _Dest = 0;
+ if (_Addr) {
+ _Source = read_16b(buf.begin()+index); index += 2;
+ _Dest = read_16b(buf.begin()+index); index += 2;
+ }
+
+ index += 2;
+ const bool crc_valid = checkCRC(buf.data(), index);
+ const bool buf_has_enough_data = (buf.size() >= index + _Plen);
+
+ if (not buf_has_enough_data) {
+ return 0;
+ }
+
+ _valid = ((not _FEC) or crc_valid) and buf_has_enough_data;
+
+#if 0
+ if (!_valid) {
+ stringstream ss;
+ ss << "Invalid PF fragment: ";
+ if (_FEC) {
+ ss << " RSk=" << (uint32_t)_RSk << " RSz=" << (uint32_t)_RSz;
+ }
+
+ if (_Addr) {
+ ss << " Source=" << _Source << " Dest=" << _Dest;
+ }
+ etiLog.log(debug, "%s\n", ss.str().c_str());
+ }
+#endif
+
+ _payload.clear();
+ if (_valid) {
+ copy( buf.begin()+index,
+ buf.begin()+index+_Plen,
+ back_inserter(_payload));
+ index += _Plen;
+ }
+
+ return index;
+}
+
+
+AFBuilder::AFBuilder(pseq_t Pseq, findex_t Fcount, size_t lifetime)
+{
+ _Pseq = Pseq;
+ _Fcount = Fcount;
+ assert(lifetime > 0);
+ lifeTime = lifetime;
+}
+
+void AFBuilder::pushPFTFrag(const Fragment &frag)
+{
+ if (_Pseq != frag.Pseq() or _Fcount != frag.Fcount()) {
+ throw invalid_argument("Invalid PFT fragment Pseq or Fcount");
+ }
+ const auto Findex = frag.Findex();
+ const bool fragment_already_received = _fragments.count(Findex);
+
+ if (not fragment_already_received)
+ {
+ _fragments[Findex] = frag;
+ }
+}
+
+bool Fragment::checkConsistency(const Fragment& other) const
+{
+ /* Consistency check, TS 102 821 Clause 7.3.2.
+ *
+ * Every PFT Fragment produced from a single AF or RS Packet shall have
+ * the same values in all of the PFT Header fields except for the Findex,
+ * Plen and HCRC fields.
+ */
+
+ return other._Fcount == _Fcount and
+ other._FEC == _FEC and
+ other._RSk == _RSk and
+ other._RSz == _RSz and
+ other._Addr == _Addr and
+ other._Source == _Source and
+ other._Dest == _Dest and
+
+ /* The Plen field of all fragments shall be the s for the initial f-1
+ * fragments and s - (L%f) for the final fragment.
+ * Note that when Reed Solomon has been used, all fragments will be of
+ * length s.
+ */
+ (_FEC ? other._Plen == _Plen : true);
+}
+
+
+AFBuilder::decode_attempt_result_t AFBuilder::canAttemptToDecode() const
+{
+ if (_fragments.empty()) {
+ return AFBuilder::decode_attempt_result_t::no;
+ }
+
+ if (_fragments.size() == _Fcount) {
+ return AFBuilder::decode_attempt_result_t::yes;
+ }
+
+ /* Check that all fragments are consistent */
+ const Fragment& first = _fragments.begin()->second;
+ if (not std::all_of(_fragments.begin(), _fragments.end(),
+ [&](const pair<int, Fragment>& pair) {
+ const Fragment& frag = pair.second;
+ return first.checkConsistency(frag) and _Pseq == frag.Pseq();
+ }) ) {
+ throw invalid_argument("Inconsistent PFT fragments");
+ }
+
+ // Calculate the minimum number of fragments necessary to apply FEC.
+ // This can't be done with the last fragment that may have a
+ // smaller size
+ // ETSI TS 102 821 V1.4.1 ch 7.4.4
+ auto frag_it = _fragments.begin();
+ if (frag_it->second.Fcount() == _Fcount - 1) {
+ frag_it++;
+
+ if (frag_it == _fragments.end()) {
+ return AFBuilder::decode_attempt_result_t::no;
+ }
+ }
+
+ const Fragment& frag = frag_it->second;
+
+ if ( frag.FEC() )
+ {
+ const uint16_t _Plen = frag.Plen();
+
+ /* max number of RS chunks that may have been sent */
+ const uint32_t _cmax = (_Fcount*_Plen) / (frag.RSk()+48);
+ assert(_cmax > 0);
+
+ /* Receiving _rxmin fragments does not guarantee that decoding
+ * will succeed! */
+ const uint32_t _rxmin = _Fcount - (_cmax*48)/_Plen;
+
+ if (_fragments.size() >= _rxmin) {
+ return AFBuilder::decode_attempt_result_t::maybe;
+ }
+ }
+
+ return AFBuilder::decode_attempt_result_t::no;
+}
+
+std::vector<uint8_t> AFBuilder::extractAF() const
+{
+ if (not _af_packet.empty()) {
+ return _af_packet;
+ }
+
+ bool ok = false;
+
+ if (canAttemptToDecode() != AFBuilder::decode_attempt_result_t::no) {
+
+ auto frag_it = _fragments.begin();
+ if (frag_it->second.Fcount() == _Fcount - 1) {
+ frag_it++;
+
+ if (frag_it == _fragments.end()) {
+ throw std::runtime_error("Invalid attempt at extracting AF");
+ }
+ }
+
+ const Fragment& ref_frag = frag_it->second;
+ const auto RSk = ref_frag.RSk();
+ const auto RSz = ref_frag.RSz();
+ const auto Plen = ref_frag.Plen();
+
+ if ( ref_frag.FEC() )
+ {
+ const uint32_t cmax = (_Fcount*Plen) / (RSk+48);
+
+ // Keep track of erasures (missing fragments) for
+ // every chunk
+ map<int, vector<int> > erasures;
+
+
+ // Assemble fragments into a RS block, immediately
+ // deinterleaving it.
+ vector<uint8_t> rs_block(Plen * _Fcount);
+ for (size_t j = 0; j < _Fcount; j++) {
+ const bool fragment_present = _fragments.count(j);
+ if (fragment_present) {
+ const auto& fragment = _fragments.at(j).payload();
+
+ if (j != _Fcount - 1 and fragment.size() != Plen) {
+ throw runtime_error("Incorrect fragment length " +
+ to_string(fragment.size()) + " " +
+ to_string(Plen));
+ }
+
+ if (j == _Fcount - 1 and fragment.size() > Plen) {
+ throw runtime_error("Incorrect last fragment length " +
+ to_string(fragment.size()) + " " +
+ to_string(Plen));
+ }
+
+ size_t k = 0;
+ for (; k < fragment.size(); k++) {
+ rs_block[k * _Fcount + j] = fragment[k];
+ }
+
+ for (; k < Plen; k++) {
+ rs_block[k * _Fcount + j] = 0x00;
+ }
+ }
+ else {
+ // fill with zeros if fragment is missing
+ for (size_t k = 0; k < Plen; k++) {
+ rs_block[k * _Fcount + j] = 0x00;
+
+ const size_t chunk_ix = (k * _Fcount + j) / (RSk + 48);
+ const size_t chunk_offset = (k * _Fcount + j) % (RSk + 48);
+ erasures[chunk_ix].push_back(chunk_offset);
+ }
+ }
+ }
+
+ // The RS block is a concatenation of chunks of RSk bytes + 48 parity
+ // followed by RSz padding
+
+ FECDecoder fec;
+ for (size_t i = 0; i < cmax; i++) {
+ // We need to pad the chunk ourself
+ vector<uint8_t> chunk(255);
+ const auto& block_begin = rs_block.begin() + (RSk + 48) * i;
+ copy(block_begin, block_begin + RSk, chunk.begin());
+ // bytes between RSk and 207 are 0x00 already
+ copy(block_begin + RSk, block_begin + RSk + 48,
+ chunk.begin() + 207);
+
+ int errors_corrected = -1;
+ if (erasures.count(i)) {
+ errors_corrected = fec.decode(chunk, erasures[i]);
+ }
+ else {
+ errors_corrected = fec.decode(chunk);
+ }
+
+ if (errors_corrected == -1) {
+ _af_packet.clear();
+ return {};
+ }
+
+#if 0
+ if (errors_corrected > 0) {
+ etiLog.log(debug, "Corrected %d errors at ", errors_corrected);
+ for (const auto &index : erasures[i]) {
+ etiLog.log(debug, " %d", index);
+ }
+ etiLog.log(debug, "\n");
+ }
+#endif
+
+ _af_packet.insert(_af_packet.end(), chunk.begin(), chunk.begin() + RSk);
+ }
+
+ _af_packet.resize(_af_packet.size() - RSz);
+ }
+ else {
+ // No FEC: just assemble fragments
+
+ for (size_t j = 0; j < _Fcount; ++j) {
+ const bool fragment_present = _fragments.count(j);
+ if (fragment_present)
+ {
+ const auto& fragment = _fragments.at(j);
+
+ _af_packet.insert(_af_packet.end(),
+ fragment.payload().begin(),
+ fragment.payload().end());
+ }
+ else {
+ throw logic_error("Missing fragment");
+ }
+ }
+ }
+
+ // EDI specific, must have a CRC.
+ if( _af_packet.size() >= 12 ) {
+ ok = checkCRC(_af_packet.data(), _af_packet.size());
+
+ if (not ok) {
+ etiLog.log(debug, "Too many errors to reconstruct AF from %zu/%u"
+ " PFT fragments\n", _fragments.size(), _Fcount);
+ }
+ }
+ }
+
+ if (not ok) {
+ _af_packet.clear();
+ }
+
+ return _af_packet;
+}
+
+std::string AFBuilder::visualise() const
+{
+ stringstream ss;
+ ss << "|";
+ for (size_t i = 0; i < _Fcount; i++) {
+ if (_fragments.count(i)) {
+ ss << ".";
+ }
+ else {
+ ss << " ";
+ }
+ }
+ ss << "| " << AFBuilder::dar_to_string(canAttemptToDecode()) << " " << lifeTime;
+ return ss.str();
+}
+
+void PFT::pushPFTFrag(const Fragment &fragment)
+{
+ // Start decoding the first pseq we receive. In normal
+ // operation without interruptions, the map should
+ // never become empty
+ if (m_afbuilders.empty()) {
+ m_next_pseq = fragment.Pseq();
+ etiLog.log(debug,"Initialise next_pseq to %u\n", m_next_pseq);
+ }
+
+ if (m_afbuilders.count(fragment.Pseq()) == 0) {
+ // The AFBuilder wants to know the lifetime in number of fragments,
+ // we know the delay in number of AF packets. Every AF packet
+ // is cut into Fcount fragments.
+ const size_t lifetime = fragment.Fcount() * m_max_delay;
+
+ // Build the afbuilder in the map in-place
+ m_afbuilders.emplace(std::piecewise_construct,
+ /* key */
+ std::forward_as_tuple(fragment.Pseq()),
+ /* builder */
+ std::forward_as_tuple(fragment.Pseq(), fragment.Fcount(), lifetime));
+ }
+
+ auto& p = m_afbuilders.at(fragment.Pseq());
+ p.pushPFTFrag(fragment);
+
+ if (m_verbose) {
+ etiLog.log(debug, "Got frag %u:%u, afbuilders: ",
+ fragment.Pseq(), fragment.Findex());
+ for (const auto &k : m_afbuilders) {
+ const bool isNextPseq = (m_next_pseq == k.first);
+ etiLog.level(debug) << (isNextPseq ? "->" : " ") <<
+ k.first << " " << k.second.visualise();
+ }
+ }
+}
+
+
+std::vector<uint8_t> PFT::getNextAFPacket()
+{
+ if (m_afbuilders.count(m_next_pseq) == 0) {
+ if (m_afbuilders.size() > m_max_delay) {
+ m_afbuilders.clear();
+ etiLog.level(debug) << " Reinit";
+ }
+
+ return {};
+ }
+
+ auto &builder = m_afbuilders.at(m_next_pseq);
+
+ using dar_t = AFBuilder::decode_attempt_result_t;
+
+ if (builder.canAttemptToDecode() == dar_t::yes) {
+ auto afpacket = builder.extractAF();
+ assert(not afpacket.empty());
+ incrementNextPseq();
+ return afpacket;
+ }
+ else if (builder.canAttemptToDecode() == dar_t::maybe) {
+ if (builder.lifeTime > 0) {
+ builder.lifeTime--;
+ }
+
+ if (builder.lifeTime == 0) {
+ // Attempt Reed-Solomon decoding
+ auto afpacket = builder.extractAF();
+
+ if (afpacket.empty()) {
+ etiLog.log(debug,"pseq %d timed out after RS", m_next_pseq);
+ }
+ incrementNextPseq();
+ return afpacket;
+ }
+ }
+ else {
+ if (builder.lifeTime > 0) {
+ builder.lifeTime--;
+ }
+
+ if (builder.lifeTime == 0) {
+ etiLog.log(debug, "pseq %d timed out\n", m_next_pseq);
+ incrementNextPseq();
+ }
+ }
+
+ return {};
+}
+
+void PFT::setMaxDelay(size_t num_af_packets)
+{
+ m_max_delay = num_af_packets;
+}
+
+void PFT::setVerbose(bool enable)
+{
+ m_verbose = enable;
+}
+
+void PFT::incrementNextPseq()
+{
+ if (m_afbuilders.count(m_next_pseq - NUM_AFBUILDERS_TO_KEEP) > 0) {
+ m_afbuilders.erase(m_next_pseq - NUM_AFBUILDERS_TO_KEEP);
+ }
+
+ m_next_pseq++;
+}
+
+}
+}
diff --git a/lib/edi/PFT.hpp b/lib/edi/PFT.hpp
new file mode 100644
index 0000000..779509b
--- /dev/null
+++ b/lib/edi/PFT.hpp
@@ -0,0 +1,166 @@
+/* ------------------------------------------------------------------
+ * Copyright (C) 2017 AVT GmbH - Fabien Vercasson
+ * Copyright (C) 2017 Matthias P. Braendli
+ * matthias.braendli@mpb.li
+ *
+ * http://opendigitalradio.org
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+ * express or implied.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ * -------------------------------------------------------------------
+ */
+
+#pragma once
+#include <stdio.h>
+#include <vector>
+#include <map>
+#include <stdint.h>
+
+namespace EdiDecoder {
+namespace PFT {
+
+using pseq_t = uint16_t;
+using findex_t = uint32_t; // findex is a 24-bit value
+
+class Fragment
+{
+ public:
+ // Load the data for one fragment from buf into
+ // the Fragment.
+ // \returns the number of bytes of useful data found in buf
+ // A non-zero return value doesn't imply a valid fragment
+ // the isValid() method must be used to verify this.
+ size_t loadData(const std::vector<uint8_t> &buf);
+
+ bool isValid() const { return _valid; }
+ pseq_t Pseq() const { return _Pseq; }
+ findex_t Findex() const { return _Findex; }
+ findex_t Fcount() const { return _Fcount; }
+ bool FEC() const { return _FEC; }
+ uint16_t Plen() const { return _Plen; }
+ uint8_t RSk() const { return _RSk; }
+ uint8_t RSz() const { return _RSz; }
+ const std::vector<uint8_t>& payload() const
+ { return _payload; }
+
+ bool checkConsistency(const Fragment& other) const;
+
+ private:
+ std::vector<uint8_t> _payload;
+
+ pseq_t _Pseq = 0;
+ findex_t _Findex = 0;
+ findex_t _Fcount = 0;
+ bool _FEC = false;
+ bool _Addr = false;
+ uint16_t _Plen = 0;
+ uint8_t _RSk = 0;
+ uint8_t _RSz = 0;
+ uint16_t _Source = 0;
+ uint16_t _Dest = 0;
+ bool _valid = false;
+};
+
+/* The AFBuilder collects Fragments and builds an Application Frame
+ * out of them. It does error correction if necessary
+ */
+class AFBuilder
+{
+ public:
+ enum class decode_attempt_result_t {
+ yes, // The AF packet can be build because all fragments are present
+ maybe, // RS decoding may correctly decode the AF packet
+ no, // Not enough fragments present to permit RS
+ };
+
+ static std::string dar_to_string(decode_attempt_result_t dar) {
+ switch (dar) {
+ case decode_attempt_result_t::yes: return "y";
+ case decode_attempt_result_t::no: return "n";
+ case decode_attempt_result_t::maybe: return "m";
+ }
+ return "?";
+ }
+
+ AFBuilder(pseq_t Pseq, findex_t Fcount, size_t lifetime);
+
+ void pushPFTFrag(const Fragment &frag);
+
+ /* Assess if it may be possible to decode this AF packet */
+ decode_attempt_result_t canAttemptToDecode() const;
+
+ /* Try to build the AF with received fragments.
+ * Apply error correction if necessary (missing packets/CRC errors)
+ * \return an empty vector if building the AF is not possible
+ */
+ std::vector<uint8_t> extractAF(void) const;
+
+ std::pair<findex_t, findex_t>
+ numberOfFragments(void) const {
+ return {_fragments.size(), _Fcount};
+ }
+
+ std::string visualise(void) const;
+
+ /* The user of this instance can keep track of the lifetime of this
+ * builder
+ */
+ size_t lifeTime;
+
+ private:
+
+ // A map from fragment index to fragment
+ std::map<findex_t, Fragment> _fragments;
+
+ // cached version of decoded AF packet
+ mutable std::vector<uint8_t> _af_packet;
+
+ pseq_t _Pseq;
+ findex_t _Fcount;
+};
+
+class PFT
+{
+ public:
+ void pushPFTFrag(const Fragment &fragment);
+
+ /* Try to build the AF packet for the next pseq. This might
+ * skip one or more pseq according to the maximum delay setting.
+ *
+ * \return an empty vector if building the AF is not possible
+ */
+ std::vector<uint8_t> getNextAFPacket(void);
+
+ /* Set the maximum delay in number of AF Packets before we
+ * abandon decoding a given pseq.
+ */
+ void setMaxDelay(size_t num_af_packets);
+
+ /* Enable verbose fprintf */
+ void setVerbose(bool enable);
+
+ private:
+ void incrementNextPseq(void);
+
+ pseq_t m_next_pseq;
+ size_t m_max_delay = 10; // in AF packets
+
+ // Keep one AFBuilder for each Pseq
+ std::map<pseq_t, AFBuilder> m_afbuilders;
+
+ bool m_verbose = 0;
+};
+
+}
+
+}
diff --git a/lib/edi/STIDecoder.cpp b/lib/edi/STIDecoder.cpp
new file mode 100644
index 0000000..ca8cead
--- /dev/null
+++ b/lib/edi/STIDecoder.cpp
@@ -0,0 +1,191 @@
+/*
+ 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 <stdio.h>
+#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));
+}
+
+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::logic_error("EDI dsti: Assertion 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;
+}
+
+void STIDecoder::packet_completed()
+{
+ m_data_collector.assemble();
+}
+
+}
diff --git a/lib/edi/STIDecoder.hpp b/lib/edi/STIDecoder.hpp
new file mode 100644
index 0000000..201a176
--- /dev/null
+++ b/lib/edi/STIDecoder.hpp
@@ -0,0 +1,122 @@
+/*
+ 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.
+ */
+#pragma once
+
+#include "common.hpp"
+#include <cstdint>
+#include <deque>
+#include <string>
+#include <vector>
+
+namespace EdiDecoder {
+
+// Information for STI-D Management
+struct sti_management_data {
+ bool stihf;
+ bool atstf;
+ bool rfadf;
+ uint16_t dflc;
+
+ uint32_t tsta;
+};
+
+// Information for a subchannel available in EDI
+struct sti_payload_data {
+ uint16_t stream_index;
+ uint8_t rfa;
+ uint8_t tid;
+ uint8_t tidext;
+ bool crcstf;
+ uint16_t stid;
+ std::vector<uint8_t> istd;
+
+ // Return the length of ISTD in bytes
+ uint16_t stl(void) const { return istd.size(); }
+};
+
+/* A class that receives STI data must implement the interface described
+ * in the STIDataCollector. This can be e.g. a converter to ETI, or something that
+ * prepares data structures for a modulator.
+ */
+class STIDataCollector {
+ public:
+ // Tell the ETIWriter what EDI protocol we receive in *ptr.
+ // This is not part of the ETI data, but is used as check
+ virtual void update_protocol(
+ const std::string& proto,
+ uint16_t major,
+ uint16_t minor) = 0;
+
+ // STAT error field and service provider ID
+ virtual void update_stat(uint8_t stat, uint16_t spid) = 0;
+
+ // In addition to TSTA in ETI, EDI also transports more time
+ // stamp information.
+ virtual void update_edi_time(uint32_t utco, uint32_t seconds) = 0;
+
+ virtual void update_rfad(std::array<uint8_t, 9> rfad) = 0;
+ virtual void update_sti_management(const sti_management_data& data) = 0;
+
+ virtual void add_payload(sti_payload_data&& payload) = 0;
+
+ virtual void assemble() = 0;
+};
+
+/* The STIDecoder takes care of decoding the EDI TAGs related to the transport
+ * of ETI(NI) data inside AF and PF packets.
+ *
+ * PF packets are handed over to the PFT decoder, which will in turn return
+ * AF packets. AF packets are directly handled (TAG extraction) here.
+ */
+class STIDecoder {
+ public:
+ STIDecoder(STIDataCollector& data_collector, bool verbose);
+
+ /* Push bytes into the decoder. The buf can contain more
+ * than a single packet. This is useful when reading from streams
+ * (files, TCP)
+ */
+ void push_bytes(const std::vector<uint8_t> &buf);
+
+ /* Push a complete packet into the decoder. Useful for UDP and other
+ * datagram-oriented protocols.
+ */
+ void push_packet(const std::vector<uint8_t> &buf);
+
+ /* Set the maximum delay in number of AF Packets before we
+ * abandon decoding a given pseq.
+ */
+ void setMaxDelay(int num_af_packets);
+
+ private:
+ bool decode_starptr(const std::vector<uint8_t> &value, uint16_t);
+ bool decode_dsti(const std::vector<uint8_t> &value, uint16_t);
+ bool decode_ssn(const std::vector<uint8_t> &value, uint16_t n);
+ bool decode_stardmy(const std::vector<uint8_t> &value, uint16_t);
+
+ void packet_completed();
+
+ STIDataCollector& m_data_collector;
+ TagDispatcher m_dispatcher;
+
+};
+
+}
diff --git a/lib/edi/STIWriter.cpp b/lib/edi/STIWriter.cpp
new file mode 100644
index 0000000..399922a
--- /dev/null
+++ b/lib/edi/STIWriter.cpp
@@ -0,0 +1,139 @@
+/*
+ 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 "STIWriter.hpp"
+#include "crc.h"
+#include "Log.h"
+#include <cstdio>
+#include <cassert>
+#include <stdexcept>
+#include <sstream>
+#include <ctime>
+#include <iostream>
+#include <iomanip>
+#include <sstream>
+
+namespace EdiDecoder {
+
+using namespace std;
+
+void STIWriter::update_protocol(
+ const std::string& proto,
+ uint16_t major,
+ uint16_t minor)
+{
+ m_proto_valid = (proto == "DSTI" and major == 0 and minor == 0);
+
+ if (not m_proto_valid) {
+ throw std::invalid_argument("Wrong EDI protocol");
+ }
+}
+
+void STIWriter::reinit()
+{
+ m_proto_valid = false;
+ m_management_data_valid = false;
+ m_stat_valid = false;
+ m_time_valid = false;
+ m_payload_valid = false;
+ m_stiFrame.frame.clear();
+}
+
+void STIWriter::update_stat(uint8_t stat, uint16_t spid)
+{
+ m_stat = stat;
+ m_spid = spid;
+ m_stat_valid = true;
+
+ if (m_stat != 0xFF) {
+ etiLog.log(warn, "STI errorlevel %02x", m_stat);
+ }
+}
+
+void STIWriter::update_rfad(std::array<uint8_t, 9> rfad)
+{
+ (void)rfad;
+}
+
+void STIWriter::update_sti_management(const sti_management_data& data)
+{
+ m_management_data = data;
+ m_management_data_valid = true;
+}
+
+void STIWriter::add_payload(sti_payload_data&& payload)
+{
+ m_payload = move(payload);
+ m_payload_valid = true;
+}
+
+void STIWriter::update_edi_time(
+ uint32_t utco,
+ uint32_t seconds)
+{
+ if (not m_proto_valid) {
+ throw std::logic_error("Cannot update time before protocol");
+ }
+
+ m_utco = utco;
+ m_seconds = seconds;
+
+ // TODO check validity
+ m_time_valid = true;
+}
+
+
+void STIWriter::assemble()
+{
+ if (not m_proto_valid) {
+ throw std::logic_error("Cannot assemble STI before protocol");
+ }
+
+ if (not m_management_data_valid) {
+ throw std::logic_error("Cannot assemble STI before management data");
+ }
+
+ if (not m_payload_valid) {
+ throw std::logic_error("Cannot assemble STI without frame data");
+ }
+
+ // TODO check time validity
+
+ // Do copies so as to preserve existing payload data
+ m_stiFrame.frame = m_payload.istd;
+ m_stiFrame.timestamp.seconds = m_seconds;
+ m_stiFrame.timestamp.utco = m_utco;
+ m_stiFrame.timestamp.tsta = m_management_data.tsta;
+}
+
+sti_frame_t STIWriter::getFrame()
+{
+ if (m_stiFrame.frame.empty()) {
+ return {};
+ }
+
+ sti_frame_t sti;
+ swap(sti, m_stiFrame);
+ reinit();
+ return sti;
+}
+
+}
+
diff --git a/lib/edi/STIWriter.hpp b/lib/edi/STIWriter.hpp
new file mode 100644
index 0000000..a75cb69
--- /dev/null
+++ b/lib/edi/STIWriter.hpp
@@ -0,0 +1,84 @@
+/*
+ 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.
+ */
+#pragma once
+
+#include "common.hpp"
+#include "STIDecoder.hpp"
+#include <cstdint>
+#include <string>
+#include <vector>
+#include <list>
+
+namespace EdiDecoder {
+
+struct sti_frame_t {
+ std::vector<uint8_t> frame;
+ frame_timestamp_t timestamp;
+};
+
+class STIWriter : public STIDataCollector {
+ public:
+ // Tell the ETIWriter what EDI protocol we receive in *ptr.
+ // This is not part of the ETI data, but is used as check
+ virtual void update_protocol(
+ const std::string& proto,
+ uint16_t major,
+ uint16_t minor);
+
+ virtual void update_stat(uint8_t stat, uint16_t spid);
+
+ virtual void update_edi_time(
+ uint32_t utco,
+ uint32_t seconds);
+
+ virtual void update_rfad(std::array<uint8_t, 9> rfad);
+ virtual void update_sti_management(const sti_management_data& data);
+ virtual void add_payload(sti_payload_data&& payload);
+
+ virtual void assemble(void);
+
+ // Return the assembled frame or an empty frame if not ready
+ sti_frame_t getFrame();
+
+ private:
+ void reinit(void);
+
+ bool m_proto_valid = false;
+
+ bool m_management_data_valid = false;
+ sti_management_data m_management_data;
+
+ bool m_stat_valid = false;
+ uint8_t m_stat = 0;
+ uint16_t m_spid = 0;
+
+ bool m_time_valid = false;
+ uint32_t m_utco = 0;
+ uint32_t m_seconds = 0;
+
+ bool m_payload_valid = false;
+ sti_payload_data m_payload;
+
+ sti_frame_t m_stiFrame;
+};
+
+}
+
diff --git a/lib/edi/buffer_unpack.hpp b/lib/edi/buffer_unpack.hpp
new file mode 100644
index 0000000..05a1534
--- /dev/null
+++ b/lib/edi/buffer_unpack.hpp
@@ -0,0 +1,62 @@
+/*
+ Copyright (C) 2016
+ 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.
+ */
+
+#pragma once
+#include <stdint.h>
+
+namespace EdiDecoder {
+
+template<class T>
+uint16_t read_16b(T buf)
+{
+ uint16_t value = 0;
+ value = (uint16_t)(buf[0]) << 8;
+ value |= (uint16_t)(buf[1]);
+ return value;
+}
+
+template<class T>
+uint32_t read_24b(T buf)
+{
+ uint32_t value = 0;
+ value = (uint32_t)(buf[0]) << 16;
+ value |= (uint32_t)(buf[1]) << 8;
+ value |= (uint32_t)(buf[2]);
+ return value;
+}
+
+template<class T>
+uint32_t read_32b(T buf)
+{
+ uint32_t value = 0;
+ value = (uint32_t)(buf[0]) << 24;
+ value |= (uint32_t)(buf[1]) << 16;
+ value |= (uint32_t)(buf[2]) << 8;
+ value |= (uint32_t)(buf[3]);
+ return value;
+}
+
+inline uint32_t unpack1bit(uint8_t byte, int bitpos)
+{
+ return (byte & 1 << (7-bitpos)) > (7-bitpos);
+}
+
+}
diff --git a/lib/edi/common.cpp b/lib/edi/common.cpp
new file mode 100644
index 0000000..b4b0c79
--- /dev/null
+++ b/lib/edi/common.cpp
@@ -0,0 +1,323 @@
+/*
+ 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 "common.hpp"
+#include "buffer_unpack.hpp"
+#include "Log.h"
+#include "crc.h"
+#include <iomanip>
+#include <sstream>
+#include <cassert>
+#include <cmath>
+#include <cstdio>
+
+namespace EdiDecoder {
+
+using namespace std;
+
+bool frame_timestamp_t::valid() const
+{
+ return tsta != 0xFFFFFF;
+}
+
+string frame_timestamp_t::to_string() const
+{
+ const time_t seconds_in_unix_epoch = to_unix_epoch();
+
+ stringstream ss;
+ if (valid()) {
+ ss << "Timestamp: ";
+ }
+ else {
+ ss << "Timestamp not valid: ";
+ }
+ ss << std::put_time(std::gmtime(&seconds_in_unix_epoch), "%c %Z") <<
+ " + " << ((double)tsta / 16384000.0);
+ return ss.str();
+}
+
+time_t frame_timestamp_t::to_unix_epoch() const
+{
+ // EDI epoch: 2000-01-01T00:00:00Z
+ // Convert using
+ // TZ=UTC python -c 'import datetime; print(datetime.datetime(2000,1,1,0,0,0,0).strftime("%s"))'
+ return 946684800 + seconds - utco;
+}
+
+std::chrono::system_clock::time_point frame_timestamp_t::to_system_clock() const
+{
+ auto ts = chrono::system_clock::from_time_t(to_unix_epoch());
+
+ // PPS offset in seconds = tsta / 16384000
+ ts += chrono::nanoseconds(std::lrint(tsta / 0.016384));
+
+ return ts;
+}
+
+
+TagDispatcher::TagDispatcher(
+ std::function<void()>&& af_packet_completed, bool verbose) :
+ m_af_packet_completed(move(af_packet_completed))
+{
+ m_pft.setVerbose(verbose);
+}
+
+void TagDispatcher::push_bytes(const vector<uint8_t> &buf)
+{
+ copy(buf.begin(), buf.end(), back_inserter(m_input_data));
+
+ while (m_input_data.size() > 2) {
+ if (m_input_data[0] == 'A' and m_input_data[1] == 'F') {
+ const decode_state_t st = decode_afpacket(m_input_data);
+
+ if (st.num_bytes_consumed == 0 and not st.complete) {
+ // We need to refill our buffer
+ break;
+ }
+
+ if (st.num_bytes_consumed) {
+ vector<uint8_t> remaining_data;
+ copy(m_input_data.begin() + st.num_bytes_consumed,
+ m_input_data.end(),
+ back_inserter(remaining_data));
+ m_input_data = remaining_data;
+ }
+
+ if (st.complete) {
+ m_af_packet_completed();
+ }
+ }
+ else if (m_input_data[0] == 'P' and m_input_data[1] == 'F') {
+ PFT::Fragment fragment;
+ const size_t fragment_bytes = fragment.loadData(m_input_data);
+
+ if (fragment_bytes == 0) {
+ // We need to refill our buffer
+ break;
+ }
+
+ vector<uint8_t> remaining_data;
+ copy(m_input_data.begin() + fragment_bytes,
+ m_input_data.end(),
+ back_inserter(remaining_data));
+ m_input_data = remaining_data;
+
+ if (fragment.isValid()) {
+ m_pft.pushPFTFrag(fragment);
+ }
+
+ auto af = m_pft.getNextAFPacket();
+ if (not af.empty()) {
+ decode_state_t st = decode_afpacket(af);
+
+ if (st.complete) {
+ m_af_packet_completed();
+ }
+ }
+ }
+ else {
+ etiLog.log(warn,"Unknown %c!", *m_input_data.data());
+ m_input_data.erase(m_input_data.begin());
+ }
+ }
+}
+
+void TagDispatcher::push_packet(const vector<uint8_t> &buf)
+{
+ if (buf.size() < 2) {
+ throw std::invalid_argument("Not enough bytes to read EDI packet header");
+ }
+
+ if (buf[0] == 'A' and buf[1] == 'F') {
+ const decode_state_t st = decode_afpacket(buf);
+
+ if (st.complete) {
+ m_af_packet_completed();
+ }
+
+ }
+ else if (buf[0] == 'P' and buf[1] == 'F') {
+ PFT::Fragment fragment;
+ fragment.loadData(buf);
+
+ if (fragment.isValid()) {
+ m_pft.pushPFTFrag(fragment);
+ }
+
+ auto af = m_pft.getNextAFPacket();
+ if (not af.empty()) {
+ const decode_state_t st = decode_afpacket(af);
+
+ if (st.complete) {
+ m_af_packet_completed();
+ }
+ }
+ }
+ else {
+ const char packettype[3] = {(char)buf[0], (char)buf[1], '\0'};
+ std::stringstream ss;
+ ss << "Unknown EDI packet ";
+ ss << packettype;
+ throw std::invalid_argument(ss.str());
+ }
+}
+
+void TagDispatcher::setMaxDelay(int num_af_packets)
+{
+ m_pft.setMaxDelay(num_af_packets);
+}
+
+
+#define AFPACKET_HEADER_LEN 10 // includes SYNC
+decode_state_t TagDispatcher::decode_afpacket(
+ const std::vector<uint8_t> &input_data)
+{
+ if (input_data.size() < AFPACKET_HEADER_LEN) {
+ return {false, 0};
+ }
+
+ // read length from packet
+ uint32_t taglength = read_32b(input_data.begin() + 2);
+ uint16_t seq = read_16b(input_data.begin() + 6);
+
+ const size_t crclength = 2;
+ if (input_data.size() < AFPACKET_HEADER_LEN + taglength + crclength) {
+ return {false, 0};
+ }
+
+ if (m_last_seq + 1 != seq) {
+ etiLog.level(warn) << "EDI AF Packet sequence error, " << seq;
+ }
+ m_last_seq = seq;
+
+ bool has_crc = (input_data[8] & 0x80) ? true : false;
+ uint8_t major_revision = (input_data[8] & 0x70) >> 4;
+ uint8_t minor_revision = input_data[8] & 0x0F;
+ if (major_revision != 1 or minor_revision != 0) {
+ throw invalid_argument("EDI AF Packet has wrong revision " +
+ to_string(major_revision) + "." + to_string(minor_revision));
+ }
+ uint8_t pt = input_data[9];
+ if (pt != 'T') {
+ // only support Tag
+ return {false, 0};
+ }
+
+
+ if (not has_crc) {
+ throw invalid_argument("AF packet not supported, has no CRC");
+ }
+
+ uint16_t crc = 0xffff;
+ for (size_t i = 0; i < AFPACKET_HEADER_LEN + taglength; i++) {
+ crc = crc16(crc, &input_data[i], 1);
+ }
+ crc ^= 0xffff;
+
+ uint16_t packet_crc = read_16b(input_data.begin() + AFPACKET_HEADER_LEN + taglength);
+
+ if (packet_crc != crc) {
+ throw invalid_argument(
+ "AF Packet crc wrong");
+ }
+ else {
+ vector<uint8_t> payload(taglength);
+ copy(input_data.begin() + AFPACKET_HEADER_LEN,
+ input_data.begin() + AFPACKET_HEADER_LEN + taglength,
+ payload.begin());
+
+ return {decode_tagpacket(payload),
+ AFPACKET_HEADER_LEN + taglength + 2};
+ }
+}
+
+void TagDispatcher::register_tag(const std::string& tag, tag_handler&& h)
+{
+ m_handlers[tag] = move(h);
+}
+
+
+bool TagDispatcher::decode_tagpacket(const vector<uint8_t> &payload)
+{
+ size_t length = 0;
+
+ bool success = true;
+
+ for (size_t i = 0; i + 8 < payload.size(); i += 8 + length) {
+ char tag_sz[5];
+ tag_sz[4] = '\0';
+ copy(payload.begin() + i, payload.begin() + i + 4, tag_sz);
+
+ string tag(tag_sz);
+
+ uint32_t taglength = read_32b(payload.begin() + i + 4);
+
+ if (taglength % 8 != 0) {
+ etiLog.log(warn, "Invalid tag length!");
+ break;
+ }
+ taglength /= 8;
+
+ length = taglength;
+
+ vector<uint8_t> tag_value(taglength);
+ copy( payload.begin() + i+8,
+ payload.begin() + i+8+taglength,
+ tag_value.begin());
+
+ bool tagsuccess = false;
+ bool found = false;
+ for (auto tag_handler : m_handlers) {
+ if (tag_handler.first.size() == 4 and tag_handler.first == tag) {
+ found = true;
+ tagsuccess = tag_handler.second(tag_value, 0);
+ }
+ else if (tag_handler.first.size() == 3 and
+ tag.substr(0, 3) == tag_handler.first) {
+ found = true;
+ uint8_t n = tag_sz[3];
+ tagsuccess = tag_handler.second(tag_value, n);
+ }
+ else if (tag_handler.first.size() == 2 and
+ tag.substr(0, 2) == tag_handler.first) {
+ found = true;
+ uint16_t n = 0;
+ n = (uint16_t)(tag_sz[2]) << 8;
+ n |= (uint16_t)(tag_sz[3]);
+ tagsuccess = tag_handler.second(tag_value, n);
+ }
+ }
+
+ if (not found) {
+ etiLog.log(warn, "Ignoring unknown TAG %s", tag.c_str());
+ break;
+ }
+
+ if (not tagsuccess) {
+ etiLog.log(warn, "Error decoding TAG %s", tag.c_str());
+ success = tagsuccess;
+ break;
+ }
+ }
+
+ return success;
+}
+
+}
diff --git a/lib/edi/common.hpp b/lib/edi/common.hpp
new file mode 100644
index 0000000..887bc3d
--- /dev/null
+++ b/lib/edi/common.hpp
@@ -0,0 +1,92 @@
+/*
+ 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.
+ */
+#pragma once
+
+#include "PFT.hpp"
+#include <functional>
+#include <map>
+#include <chrono>
+#include <string>
+#include <vector>
+#include <cstddef>
+#include <ctime>
+
+namespace EdiDecoder {
+
+struct frame_timestamp_t {
+ uint32_t seconds = 0;
+ uint32_t utco = 0;
+ uint32_t tsta = 0; // According to EN 300 797 Annex B
+
+ bool valid() const;
+ std::string to_string() const;
+ time_t to_unix_epoch() const;
+ std::chrono::system_clock::time_point to_system_clock() const;
+};
+
+struct decode_state_t {
+ decode_state_t(bool _complete, size_t _num_bytes_consumed) :
+ complete(_complete), num_bytes_consumed(_num_bytes_consumed) {}
+ bool complete;
+ size_t num_bytes_consumed;
+};
+
+/* The TagDispatcher takes care of decoding EDI, with or without PFT, and
+ * will call functions when TAGs are encountered.
+ *
+ * PF packets are handed over to the PFT decoder, which will in turn return
+ * AF packets. AF packets are directly dispatched to the TAG functions.
+ */
+class TagDispatcher {
+ public:
+ TagDispatcher(std::function<void()>&& af_packet_completed, bool verbose);
+
+ /* Push bytes into the decoder. The buf can contain more
+ * than a single packet. This is useful when reading from streams
+ * (files, TCP)
+ */
+ void push_bytes(const std::vector<uint8_t> &buf);
+
+ /* Push a complete packet into the decoder. Useful for UDP and other
+ * datagram-oriented protocols.
+ */
+ void push_packet(const std::vector<uint8_t> &buf);
+
+ /* Set the maximum delay in number of AF Packets before we
+ * abandon decoding a given pseq.
+ */
+ void setMaxDelay(int num_af_packets);
+
+ using tag_handler = std::function<bool(std::vector<uint8_t>, uint16_t)>;
+ void register_tag(const std::string& tag, tag_handler&& h);
+
+ private:
+ decode_state_t decode_afpacket(const std::vector<uint8_t> &input_data);
+ bool decode_tagpacket(const std::vector<uint8_t> &payload);
+
+ PFT::PFT m_pft;
+ uint16_t m_last_seq = 0;
+ std::vector<uint8_t> m_input_data;
+ std::map<std::string, tag_handler> m_handlers;
+ std::function<void()> m_af_packet_completed;
+};
+
+}
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