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authorMatthias P. Braendli <matthias.braendli@mpb.li>2019-08-21 10:11:35 +0200
committerMatthias P. Braendli <matthias.braendli@mpb.li>2019-08-21 10:11:35 +0200
commit86ea8cd8b8b5af7917db28ae30cfb2d2886868fe (patch)
tree7222d8e077dd2155eecac68b8c78330bcfe5dc80 /lib/edioutput/AFPacket.cpp
parent86fbf91f7323a2c5626a357b8414b15e20c19c9e (diff)
parent5ee85c4ac41337e383eb1a735bc05f1e5d46a98f (diff)
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Merge branch 'ediInput' into next
Diffstat (limited to 'lib/edioutput/AFPacket.cpp')
-rw-r--r--lib/edioutput/AFPacket.cpp96
1 files changed, 96 insertions, 0 deletions
diff --git a/lib/edioutput/AFPacket.cpp b/lib/edioutput/AFPacket.cpp
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+/*
+ Copyright (C) 2014
+ Matthias P. Braendli, matthias.braendli@mpb.li
+
+ http://www.opendigitalradio.org
+
+ EDI output.
+ This implements an AF Packet as defined ETSI TS 102 821.
+ Also see ETSI TS 102 693
+
+ */
+/*
+ This file is part of the ODR-mmbTools.
+
+ 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+#include "config.h"
+#include "crc.h"
+#include "AFPacket.h"
+#include "TagItems.h"
+#include "TagPacket.h"
+#include <vector>
+#include <string>
+#include <iostream>
+#include <cstdio>
+#include <cstdint>
+#include <arpa/inet.h>
+
+namespace edi {
+
+// Header PT field. AF packet contains TAG payload
+const uint8_t AFHEADER_PT_TAG = 'T';
+
+// AF Packet Major (3 bits) and Minor (4 bits) version
+const uint8_t AFHEADER_VERSION = 0x10; // MAJ=1, MIN=0
+
+AFPacket AFPacketiser::Assemble(TagPacket tag_packet)
+{
+ std::vector<uint8_t> payload = tag_packet.Assemble();
+
+ if (m_verbose)
+ std::cerr << "Assemble AFPacket " << seq << std::endl;
+
+ std::string pack_data("AF"); // SYNC
+ std::vector<uint8_t> packet(pack_data.begin(), pack_data.end());
+
+ uint32_t taglength = payload.size();
+
+ if (m_verbose)
+ std::cerr << " AFPacket payload size " << payload.size() << std::endl;
+
+ // write length into packet
+ packet.push_back((taglength >> 24) & 0xFF);
+ packet.push_back((taglength >> 16) & 0xFF);
+ packet.push_back((taglength >> 8) & 0xFF);
+ packet.push_back(taglength & 0xFF);
+
+ // fill rest of header
+ packet.push_back(seq >> 8);
+ packet.push_back(seq & 0xFF);
+ seq++;
+ packet.push_back((have_crc ? 0x80 : 0) | AFHEADER_VERSION); // ar_cf: CRC=1
+ packet.push_back(AFHEADER_PT_TAG);
+
+ // insert payload, must have a length multiple of 8 bytes
+ packet.insert(packet.end(), payload.begin(), payload.end());
+
+ // calculate CRC over AF Header and payload
+ uint16_t crc = 0xffff;
+ crc = crc16(crc, &(packet.front()), packet.size());
+ crc ^= 0xffff;
+
+ if (m_verbose)
+ fprintf(stderr, " AFPacket crc %x\n", crc);
+
+ packet.push_back((crc >> 8) & 0xFF);
+ packet.push_back(crc & 0xFF);
+
+ if (m_verbose)
+ std::cerr << " AFPacket length " << packet.size() << std::endl;
+
+ return packet;
+}
+
+}