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/*
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 Her Majesty
the Queen in Right of Canada (Communications Research Center Canada)
Copyright (C) 2024
Matthias P. Braendli, matthias.braendli@mpb.li
http://opendigitalradio.org
TII generation according to ETSI EN 300 401 Clause 14.8
*/
/*
This file is part of ODR-DabMod.
ODR-DabMod 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-DabMod 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-DabMod. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "ModPlugin.h"
#include "RemoteControl.h"
#include <cstddef>
#include <vector>
#include <string>
struct tii_config_t
{
bool enable = false;
int comb = 0;
int pattern = 0;
/* EN 300 401 clause 14.8 describes how to generate the TII signal, and
* defines z_{m,0,k}:
*
* z_{m,0,k} = A_{c,p}(k) e^{j \psi_k} + A_{c,p}(k-1) e^{j \psi{k-1}}
*
* What was implemented in the old variant was
*
* z_{m,0,k} = A_{c,p}(k) e^{j \psi_k} + A_{c,p}(k-1) e^{j \psi{k}}
* ^
* |
* Wrong phase on the second
* carrier of the pair.
*
* Correctly implemented decoders ought to be able to decode such a TII,
* but will not be able to correctly estimate the delay of different
* transmitters.
*
* The option 'old_variant' allows the user to choose between this
* old incorrect implementation and the new conforming one.
*/
bool old_variant = false;
};
class TIIError : public std::runtime_error {
public:
TIIError(const char* msg) :
std::runtime_error(msg) {}
TIIError(const std::string& msg) :
std::runtime_error(msg) {}
};
class TII : public ModCodec, public RemoteControllable
{
public:
TII(unsigned int dabmode, tii_config_t& tii_config, bool fixedPoint);
virtual ~TII() {}
int process(Buffer* dataIn, Buffer* dataOut) override;
const char* name() override;
/******* REMOTE CONTROL ********/
virtual void set_parameter(const std::string& parameter, const std::string& value) override;
virtual const std::string get_parameter(const std::string& parameter) const override;
virtual const json::map_t get_all_values() const override;
protected:
// Fill m_Acp with the correct carriers for the pattern/comb
// combination
void prepare_pattern(void);
// prerequisites: calling thread must hold m_Acp mutex
void enable_carrier(int k);
// Configuration settings
unsigned int m_dabmode;
// Remote-controllable settings
tii_config_t& m_conf;
bool m_fixedPoint = false;
// Internal flag when to insert TII
bool m_insert = true;
size_t m_carriers = 0;
std::string m_name;
// m_Acp is read by modulator thread, and written
// to by RC thread.
mutable std::mutex m_enabled_carriers_mutex;
// m_Acp corresponds to the A_{c,p}(k) function from the spec, except
// that the leftmost carrier is at index 0, and not at -m_carriers/2 like
// in the spec.
std::vector<bool> m_Acp;
};
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