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authorMatthias P. Braendli <matthias.braendli@mpb.li>2019-06-25 10:50:23 +0200
committerMatthias P. Braendli <matthias.braendli@mpb.li>2019-06-25 10:50:23 +0200
commit03967733d70220e2de7af3cdad320aec5c82ede1 (patch)
tree4a1bd7adfb8825c95cfc1fa0c69f857aef234561 /lib/edi/STIDecoder.hpp
parent15d7ad8ac5bb187ac323da7dc30b9724b18c7df7 (diff)
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Add more EDI input improvements
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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.
+ */
+#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;
+
+};
+
+}