11 changed files with 608 additions and 45 deletions
@ -0,0 +1,45 @@ |
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<?xml version="1.0"?> |
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<block> |
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<name>RDS Decoder (redsea)</name> |
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<key>crfa_rds_decoder_redsea</key> |
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<category>[crfa]</category> |
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<import>import crfa</import> |
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<make>crfa.rds_decoder($log, $debug)</make> |
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<param> |
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<name>Log</name> |
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<key>log</key> |
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<value>False</value> |
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<type>bool</type> |
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<option> |
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<name>Enable</name> |
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<key>True</key> |
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</option> |
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<option> |
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<name>Disable</name> |
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<key>False</key> |
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</option> |
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</param> |
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<param> |
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<name>Debug</name> |
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<key>debug</key> |
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<value>False</value> |
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<type>bool</type> |
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<option> |
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<name>Enable</name> |
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<key>True</key> |
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</option> |
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<option> |
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<name>Disable</name> |
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<key>False</key> |
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</option> |
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</param> |
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<sink> |
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<name>in</name> |
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<type>byte</type> |
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</sink> |
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<source> |
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<name>out</name> |
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<type>message</type> |
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<optional>1</optional> |
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</source> |
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</block> |
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/* -*- c++ -*- */ |
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/*
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* Copyright 2017 <+YOU OR YOUR COMPANY+>. |
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*
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* This is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 3, or (at your option) |
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* any later version. |
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*
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* This software is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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*
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* You should have received a copy of the GNU General Public License |
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* along with this software; see the file COPYING. If not, write to |
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* the Free Software Foundation, Inc., 51 Franklin Street, |
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* Boston, MA 02110-1301, USA. |
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*/ |
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#ifndef INCLUDED_CRFA_RDS_DECODER_REDSEA_H |
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#define INCLUDED_CRFA_RDS_DECODER_REDSEA_H |
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#include <crfa/api.h> |
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#include <gnuradio/sync_block.h> |
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namespace gr { |
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namespace crfa { |
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/*!
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* \brief <+description of block+> |
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* \ingroup crfa |
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* |
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*/ |
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class CRFA_API rds_decoder_redsea : virtual public gr::sync_block |
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{ |
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public: |
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typedef boost::shared_ptr<rds_decoder_redsea> sptr; |
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/*!
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* \brief Return a shared_ptr to a new instance of crfa::rds_decoder_redsea. |
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* |
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* To avoid accidental use of raw pointers, crfa::rds_decoder_redsea's |
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* constructor is in a private implementation |
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* class. crfa::rds_decoder_redsea::make is the public interface for |
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* creating new instances. |
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*/ |
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static sptr make(bool log,bool debug); |
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}; |
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} // namespace crfa
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} // namespace gr
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#endif /* INCLUDED_CRFA_RDS_DECODER_REDSEA_H */ |
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@ -0,0 +1,334 @@ |
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/* -*- c++ -*- */ |
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/*
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* Copyright 2016 <+YOU OR YOUR COMPANY+>. |
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*
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* This is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 3, or (at your option) |
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* any later version. |
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*
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* This software is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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*
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* You should have received a copy of the GNU General Public License |
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* along with this software; see the file COPYING. If not, write to |
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* the Free Software Foundation, Inc., 51 Franklin Street, |
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* Boston, MA 02110-1301, USA. |
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*/ |
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#ifdef HAVE_CONFIG_H |
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#include "config.h" |
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#endif |
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#define dout debug && std::cout |
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#define lout log && std::cout |
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#include <gnuradio/io_signature.h> |
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#include "constants.h" |
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#include "rds_decoder_redsea_impl.h" |
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#include <map> |
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#include <vector> |
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namespace gr { |
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namespace crfa { |
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rds_decoder_redsea::sptr |
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rds_decoder_redsea::make(bool log, bool debug) |
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{ |
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return gnuradio::get_initial_sptr |
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(new rds_decoder_redsea_impl(log, debug)); |
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} |
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/*
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* The private constructor |
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*/ |
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rds_decoder_redsea_impl::rds_decoder_redsea_impl(bool log, bool debug) |
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: gr::sync_block("rds_decoder_redsea", |
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gr::io_signature::make (1, 1, sizeof(char)), |
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gr::io_signature::make (0, 0, 0)), |
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log(log), |
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debug(debug) |
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{ |
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set_output_multiple(104); // 1 RDS datagroup = 104 bits
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message_port_register_out(pmt::mp("out")); |
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enter_no_sync(); |
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} |
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/*
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* Our virtual destructor. |
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*/ |
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rds_decoder_redsea_impl::~rds_decoder_redsea_impl() |
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{ |
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} |
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////////////////////////// HELPER FUNTIONS /////////////////////////
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void rds_decoder_redsea_impl::enter_no_sync() { |
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pmt::pmt_t data(pmt::PMT_F); |
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//pmt::pmt_t meta(pmt::PMT_NIL);
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pmt::pmt_t meta(pmt::from_long(1)); |
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pmt::pmt_t pdu(pmt::cons(meta, data)); // make PDU: (metadata, data) pair
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message_port_pub(pmt::mp("out"), pdu); |
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presync = false; |
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d_state = NO_SYNC; |
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} |
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void rds_decoder_redsea_impl::enter_sync(unsigned int sync_block_number) { |
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pmt::pmt_t data(pmt::PMT_T); |
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//pmt::pmt_t meta(pmt::PMT_NIL);
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pmt::pmt_t meta(pmt::from_long(1)); |
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pmt::pmt_t pdu(pmt::cons(meta, data)); // make PDU: (metadata, data) pair
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message_port_pub(pmt::mp("out"), pdu); |
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last_wrong_blocks_counter = 0; |
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wrong_blocks_counter = 0; |
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blocks_counter = 0; |
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block_bit_counter = 0; |
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block_number = (sync_block_number + 1) % 4; |
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group_assembly_started = false; |
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d_state = SYNC; |
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} |
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/* see Annex B, page 64 of the standard */ |
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unsigned int rds_decoder_redsea_impl::calc_syndrome(unsigned long message, |
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unsigned char mlen) { |
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unsigned long reg = 0; |
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unsigned int i; |
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const unsigned long poly = 0x5B9; |
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const unsigned char plen = 10; |
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for (i = mlen; i > 0; i--) { |
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reg = (reg << 1) | ((message >> (i-1)) & 0x01); |
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if (reg & (1 << plen)) reg = reg ^ poly; |
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} |
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for (i = plen; i > 0; i--) { |
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reg = reg << 1; |
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if (reg & (1<<plen)) reg = reg ^ poly; |
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} |
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return (reg & ((1<<plen)-1)); // select the bottom plen bits of reg
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} |
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void rds_decoder_redsea_impl::decode_group(unsigned int *group) { |
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// raw data bytes, as received from RDS.
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// 8 info bytes, followed by 4 RDS offset chars: ABCD/ABcD/EEEE (in US)
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unsigned char bytes[13]; |
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// RDS information words
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bytes[0] = (group[0] >> 8U) & 0xffU; |
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bytes[1] = (group[0] ) & 0xffU; |
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bytes[2] = (group[1] >> 8U) & 0xffU; |
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bytes[3] = (group[1] ) & 0xffU; |
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bytes[4] = (group[2] >> 8U) & 0xffU; |
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bytes[5] = (group[2] ) & 0xffU; |
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bytes[6] = (group[3] >> 8U) & 0xffU; |
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bytes[7] = (group[3] ) & 0xffU; |
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// RDS offset words
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bytes[8] = offset_chars[0]; |
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bytes[9] = offset_chars[1]; |
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bytes[10] = offset_chars[2]; |
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bytes[11] = offset_chars[3]; |
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bytes[12]=last_wrong_blocks_counter; |
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pmt::pmt_t data(pmt::make_blob(bytes, 13)); |
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//pmt::pmt_t meta(pmt::PMT_NIL);
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pmt::pmt_t meta(pmt::from_long(0)); |
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pmt::pmt_t pdu(pmt::cons(meta, data)); // make PDU: (metadata, data) pair
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message_port_pub(pmt::mp("out"), pdu); |
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} |
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//work function
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int rds_decoder_redsea_impl::work (int noutput_items, |
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gr_vector_const_void_star &input_items, |
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gr_vector_void_star &output_items) |
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{ |
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const bool *in = (const bool *) input_items[0]; |
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dout << "RDS data decoder at work: input_items = " |
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<< noutput_items << ", /104 = " |
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<< noutput_items / 104 << std::endl; |
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int i=0,j; |
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unsigned long bit_distance, block_distance; |
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unsigned int block_calculated_crc, block_received_crc, checkword,dataword; |
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unsigned int reg_syndrome; |
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unsigned char offset_char('x'); // x = error while decoding the word offset
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/* the synchronization process is described in Annex C, page 66 of the standard */ |
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while (i<noutput_items) { |
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reg=(reg<<1)|in[i]; // reg contains the last 26 rds bits
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switch (d_state) { |
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case NO_SYNC: |
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reg_syndrome = calc_syndrome(reg,26); |
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for (j=0;j<5;j++) { |
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if (reg_syndrome==syndrome[j]) { |
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if (!presync) { |
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lastseen_offset=j; |
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lastseen_offset_counter=bit_counter; |
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presync=true; |
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} |
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else { |
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bit_distance=bit_counter-lastseen_offset_counter; |
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if (offset_pos[lastseen_offset]>=offset_pos[j])
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block_distance=offset_pos[j]+4-offset_pos[lastseen_offset]; |
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else |
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block_distance=offset_pos[j]-offset_pos[lastseen_offset]; |
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if ((block_distance*26)!=bit_distance) presync=false; |
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else { |
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lout << "@@@@@ Sync State Detected" << std::endl; |
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enter_sync(j); |
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} |
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} |
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break; //syndrome found, no more cycles
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} |
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} |
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break; |
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case SYNC: |
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/* wait until 26 bits enter the buffer */ |
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if (block_bit_counter<25) block_bit_counter++; |
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else { |
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/*uint32_t block = reg;
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uint16_t message = block >> 10; |
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received_offset_ = offsetForSyndrome(calcSyndrome(block)); |
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if (!acquireSync()) |
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continue; |
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block_counter_++; |
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bool was_valid_word = true; |
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if (expected_offset_ == OFFSET_C && received_offset_ == OFFSET_CI) |
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expected_offset_ = OFFSET_CI; |
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block_has_errors_[block_counter_ % block_has_errors_.size()] = false; |
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if (received_offset_ != expected_offset_) { |
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block_has_errors_[block_counter_ % block_has_errors_.size()] = true; |
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was_valid_word = false; |
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// Detect & correct clock slips (Section C.1.2)
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if (expected_offset_ == OFFSET_A && pi_ != 0 && |
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((wideblock_ >> 12) & kBitmask16) == pi_) { |
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message = pi_; |
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wideblock_ >>= 1; |
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received_offset_ = OFFSET_A; |
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} else if (expected_offset_ == OFFSET_A && pi_ != 0 && |
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((wideblock_ >> 10) & kBitmask16) == pi_) { |
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message = pi_; |
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wideblock_ = (wideblock_ << 1) + getNextBit(); |
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received_offset_ = OFFSET_A; |
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left_to_read_ = 25; |
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} else { |
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uint32_t corrected_block = correctBurstErrors(block, expected_offset_); |
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if (corrected_block != block) { |
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message = corrected_block >> 10; |
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received_offset_ = expected_offset_; |
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} |
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} |
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// Still no valid syndrome
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if (received_offset_ != expected_offset_) |
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uncorrectable(); |
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} |
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// Error-free block received
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if (received_offset_ == expected_offset_) { |
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if (expected_offset_ == OFFSET_CI) |
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group.setCI(message); |
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else |
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group.set(block_number_for_offset[expected_offset_], message); |
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if (group.hasPi()) |
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pi_ = group.pi(); |
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} |
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expected_offset_ = nextOffsetFor(expected_offset_); |
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if (expected_offset_ == OFFSET_A) { |
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break; |
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}*/ |
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good_block=false; |
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dataword=(reg>>10) & 0xffff;//data part of received block (upper 16 bits)
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block_calculated_crc=calc_syndrome(dataword,16); |
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checkword=reg & 0x3ff;//checkword part of received block (lower 10 bits)
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/* manage special case of C or C' offset word */ |
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if (block_number==2) { |
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block_received_crc=checkword^offset_word[block_number]; |
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if (block_received_crc==block_calculated_crc) { |
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good_block=true; |
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offset_char = 'C'; |
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} else { |
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block_received_crc=checkword^offset_word[4]; |
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if (block_received_crc==block_calculated_crc) { |
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good_block=true; |
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offset_char = 'c'; // C' (C-Tag)
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} else { |
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wrong_blocks_counter++; |
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good_block=false; |
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} |
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} |
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} |
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else { |
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block_received_crc=checkword^offset_word[block_number]; |
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if (block_received_crc==block_calculated_crc) { |
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good_block=true; |
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if (block_number==0) offset_char = 'A'; |
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else if (block_number==1) offset_char = 'B'; |
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else if (block_number==3) offset_char = 'D'; |
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} else { |
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wrong_blocks_counter++; |
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good_block=false; |
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} |
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} |
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/* done checking CRC */ |
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if (block_number==0 && good_block) { |
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group_assembly_started=true; |
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group_good_blocks_counter=1; |
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} |
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if (group_assembly_started) { |
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if (!good_block) group_assembly_started=false; |
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else { |
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group[block_number]=dataword; |
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offset_chars[block_number] = offset_char; |
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group_good_blocks_counter++; |
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} |
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if (group_good_blocks_counter==5) decode_group(group); |
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} |
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block_bit_counter=0; |
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block_number=(block_number+1) % 4; |
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blocks_counter++; |
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/* 1187.5 bps / 104 bits = 11.4 groups/sec, or 45.7 blocks/sec */ |
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if (blocks_counter==50) { |
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last_wrong_blocks_counter=wrong_blocks_counter; |
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if (wrong_blocks_counter>35) { |
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lout << "@@@@@ Lost Sync (Got " << wrong_blocks_counter |
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|
<< " bad blocks on " << blocks_counter |
||||||
|
<< " total)" << std::endl; |
||||||
|
enter_no_sync(); |
||||||
|
} else { |
||||||
|
lout << "@@@@@ Still Sync-ed (Got " << wrong_blocks_counter |
||||||
|
<< " bad blocks on " << blocks_counter |
||||||
|
<< " total)" << std::endl; |
||||||
|
} |
||||||
|
blocks_counter=0; |
||||||
|
wrong_blocks_counter=0; |
||||||
|
} |
||||||
|
} |
||||||
|
break; |
||||||
|
default: |
||||||
|
d_state=NO_SYNC; |
||||||
|
break; |
||||||
|
} |
||||||
|
i++; |
||||||
|
bit_counter++; |
||||||
|
} |
||||||
|
return noutput_items; |
||||||
|
}/*end of work function*/ |
||||||
|
|
||||||
|
|
||||||
|
} /* namespace crfa */ |
||||||
|
} /* namespace gr */ |
||||||
|
|
||||||
@ -0,0 +1,79 @@ |
|||||||
|
/* -*- c++ -*- */ |
||||||
|
/*
|
||||||
|
* Copyright 2016 <+YOU OR YOUR COMPANY+>. |
||||||
|
*
|
||||||
|
* This 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, or (at your option) |
||||||
|
* any later version. |
||||||
|
*
|
||||||
|
* This software 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 software; see the file COPYING. If not, write to |
||||||
|
* the Free Software Foundation, Inc., 51 Franklin Street, |
||||||
|
* Boston, MA 02110-1301, USA. |
||||||
|
*/ |
||||||
|
|
||||||
|
#ifndef INCLUDED_CRFA_RDS_DECODER_IMPL_H |
||||||
|
#define INCLUDED_CRFA_RDS_DECODER_IMPL_H |
||||||
|
|
||||||
|
#include <crfa/rds_decoder_redsea.h> |
||||||
|
|
||||||
|
namespace gr { |
||||||
|
namespace crfa { |
||||||
|
|
||||||
|
class rds_decoder_redsea_impl : public rds_decoder_redsea |
||||||
|
{ |
||||||
|
public: |
||||||
|
rds_decoder_redsea_impl(bool log, bool debug); |
||||||
|
|
||||||
|
private: |
||||||
|
~rds_decoder_redsea_impl(); |
||||||
|
|
||||||
|
// Where all the action really happens
|
||||||
|
int work(int noutput_items, |
||||||
|
gr_vector_const_void_star &input_items, |
||||||
|
gr_vector_void_star &output_items); |
||||||
|
void enter_no_sync(); |
||||||
|
void enter_sync(unsigned int); |
||||||
|
unsigned int calc_syndrome(unsigned long, unsigned char); |
||||||
|
void decode_group(unsigned int*); |
||||||
|
|
||||||
|
unsigned long bit_counter; |
||||||
|
unsigned long lastseen_offset_counter, reg; |
||||||
|
unsigned int block_bit_counter; |
||||||
|
unsigned int wrong_blocks_counter; |
||||||
|
unsigned int blocks_counter; |
||||||
|
unsigned int group_good_blocks_counter; |
||||||
|
unsigned int group[4]; |
||||||
|
unsigned char offset_chars[4]; // [ABCcDEx] (x=error)
|
||||||
|
bool debug; |
||||||
|
bool log; |
||||||
|
bool presync; |
||||||
|
bool good_block; |
||||||
|
bool group_assembly_started; |
||||||
|
unsigned char last_wrong_blocks_counter; |
||||||
|
unsigned char lastseen_offset; |
||||||
|
unsigned char block_number; |
||||||
|
enum { NO_SYNC, SYNC } d_state; |
||||||
|
//below copied from redsea
|
||||||
|
enum eOffset { |
||||||
|
OFFSET_A, OFFSET_B, OFFSET_C, OFFSET_CI, OFFSET_D, OFFSET_INVALID |
||||||
|
} ; |
||||||
|
uint32_t calcSyndrome(uint32_t vec); |
||||||
|
eOffset offsetForSyndrome(uint16_t syndrome); |
||||||
|
eOffset nextOffsetFor(eOffset o); |
||||||
|
uint32_t correctBurstErrors(uint32_t block, eOffset offset); |
||||||
|
|
||||||
|
|
||||||
|
}; |
||||||
|
|
||||||
|
} // namespace crfa
|
||||||
|
} // namespace gr
|
||||||
|
|
||||||
|
#endif /* INCLUDED_CRFA_RDS_DECODER_IMPL_H */ |
||||||
|
|
||||||
Loading…
Reference in new issue