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/*
Copyright (C) 2017
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 <stdint.h>
#include <deque>
#include <string>
#include <vector>
#include "PFT.hpp"
#include "eti.hpp"
namespace EdiDecoder {
// Information for Frame Characterisation available in
// EDI.
//
// Number of streams is given separately, and frame length
// is calculated in the DataCollector
struct eti_fc_data {
bool atstf;
uint32_t tsta;
bool ficf;
uint16_t dflc;
uint8_t mid;
uint8_t fp;
uint8_t fct(void) const { return dflc % 250; }
};
// Information for a subchannel available in EDI
struct eti_stc_data {
uint8_t stream_index;
uint8_t scid;
uint8_t sad;
uint8_t tpl;
std::vector<uint8_t> mst;
// Return the length of the MST in multiples of 64 bits
uint16_t stl(void) const { return mst.size() / 8; }
};
/* A class that receives multiplex data must implement the interface described
* in the DataCollector. This can be e.g. a converter to ETI, or something that
* prepares data structures for a modulator.
*/
class DataCollector {
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;
// Update the data for the frame characterisation
virtual void update_fc_data(const eti_fc_data& fc_data) = 0;
virtual void update_fic(const std::vector<uint8_t>& fic) = 0;
virtual void update_err(uint8_t err) = 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_mnsc(uint16_t mnsc) = 0;
virtual void update_rfu(uint16_t rfu) = 0;
virtual void add_subchannel(const eti_stc_data& stc) = 0;
// Tell the ETIWriter that the AFPacket is complete
virtual void assemble(void) = 0;
};
/* The ETIDecoder 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 ETIDecoder {
public:
ETIDecoder(DataCollector& data_collector);
/* 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:
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;
};
decode_state_t decode_afpacket(const std::vector<uint8_t> &input_data);
bool decode_tagpacket(const std::vector<uint8_t> &payload);
bool decode_starptr(const std::vector<uint8_t> &value);
bool decode_deti(const std::vector<uint8_t> &value);
bool decode_estn(const std::vector<uint8_t> &value, uint8_t n);
bool decode_stardmy(const std::vector<uint8_t> &value);
DataCollector& m_data_collector;
PFT::PFT m_pft;
uint16_t m_last_seq;
std::vector<uint8_t> m_input_data;
};
}
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