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authorMatthias P. Braendli <matthias.braendli@mpb.li>2019-08-13 10:48:49 +0200
committerMatthias P. Braendli <matthias.braendli@mpb.li>2019-08-13 10:48:49 +0200
commitef536ba0e190df286d273ded5ba93f4a2f39b45e (patch)
tree5d45c336e2244e3e59e5ae681dd74df037d809ad /lib/ClockTAI.h
parent14f69f9c915cf644147a52b803d79ff8f40a4ea1 (diff)
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Pull in files from odr-mmbtools-common
Telnet RC is now single-user only.
Diffstat (limited to 'lib/ClockTAI.h')
-rw-r--r--lib/ClockTAI.h102
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diff --git a/lib/ClockTAI.h b/lib/ClockTAI.h
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+/*
+ Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
+ 2011, 2012 Her Majesty the Queen in Right of Canada (Communications
+ Research Center Canada)
+
+ Copyright (C) 2019
+ Matthias P. Braendli, matthias.braendli@mpb.li
+
+ http://www.opendigitalradio.org
+ */
+/*
+ This file is part of ODR-DabMux.
+
+ ODR-DabMux 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.
+
+ ODR-DabMux 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 ODR-DabMux. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/* The EDI output needs TAI clock, according to ETSI TS 102 693 Annex F
+ * "EDI Timestamps". This module can set the local CLOCK_TAI clock by
+ * setting the TAI-UTC offset using adjtimex.
+ *
+ * This functionality requires Linux 3.10 (30 Jun 2013) or newer.
+ */
+
+#pragma once
+
+#include <cstdint>
+#include <cstdlib>
+#include <sstream>
+#include <chrono>
+#include <future>
+#include <mutex>
+#include <string>
+#include <vector>
+#include "RemoteControl.h"
+
+// EDI needs to know UTC-TAI, but doesn't need the CLOCK_TAI to be set.
+// We can keep this code, maybe for future use
+#define SUPPORT_SETTING_CLOCK_TAI 0
+
+/* Loads, parses and represents TAI-UTC offset information from the IETF bulletin */
+class ClockTAI : public RemoteControllable {
+ public:
+ ClockTAI(const std::vector<std::string>& bulletin_urls);
+
+ // Fetch the bulletin from the IETF website and return the current
+ // TAI-UTC offset.
+ // Throws runtime_error on failure.
+ int get_offset(void);
+
+#if SUPPORT_SETTING_CLOCK_TAI
+ // Update the local TAI clock according to the TAI-UTC offset
+ // return 0 on success
+ int update_local_tai_clock(int offset);
+#endif
+
+ private:
+ class download_failed {};
+
+ // Either retrieve the bulletin from the cache or if necessarly
+ // download it, and calculate the TAI-UTC offset.
+ // Returns the offset or throws download_failed or a range_error
+ // if the offset is out of bounds.
+ int get_valid_offset(void);
+
+ // Download of new bulletin is done asynchronously
+ std::future<int> m_offset_future;
+
+ // Protect all data members, as RC functions are in another thread
+ mutable std::mutex m_data_mutex;
+
+ // The currently used TAI-UTC offset
+ int m_offset = 0;
+ int m_offset_valid = false;
+
+ std::vector<std::string> m_bulletin_urls;
+
+ std::string m_bulletin;
+ std::chrono::system_clock::time_point m_bulletin_download_time;
+
+ // Update the cache file with the current m_bulletin
+ void update_cache(const char* cache_filename);
+
+
+ /* Remote control */
+ virtual void set_parameter(const std::string& parameter,
+ const std::string& value);
+
+ /* Getting a parameter always returns a string. */
+ virtual const std::string get_parameter(const std::string& parameter) const;
+};
+