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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/common.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 "PFT.hpp"
+#include <functional>
+#include <map>
+#include <string>
+#include <vector>
+#include <cstddef>
+#include <ctime>
+
+namespace EdiDecoder {
+
+struct frame_timestamp_t {
+ uint32_t seconds = 0;
+ uint32_t utco = 0;
+
+ std::string to_string() const;
+ time_t to_unix_epoch() 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;
+};
+
+}