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gr-m17/lib/m17_coder_impl.cc

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/* -*- c++ -*- */
/*
* Copyright 2023 jmfriedt.
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gnuradio/io_signature.h>
#include "m17_coder_impl.h"
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <unistd.h>
#include "../M17_Implementations/SP5WWP/lib/lib.h"
#include "../M17_Implementations/SP5WWP/lib/math/golay.h"
#include "../M17_Implementations/SP5WWP/lib/payload/crc.h"
#include "../M17_Implementations/SP5WWP/lib/encode/symbols.h"
#include "../M17_Implementations/SP5WWP/lib/phy/sync.h"
#include "../M17_Implementations/SP5WWP/lib/encode/convol.h"
#include "../M17_Implementations/SP5WWP/lib/payload/call.h"
#include "../M17_Implementations/SP5WWP/lib/payload/lsf.h"
#include "../M17_Implementations/SP5WWP/lib/phy/interleave.h"
#include "../M17_Implementations/SP5WWP/lib/phy/randomize.h"
namespace gr {
namespace m17 {
struct LSF lsf;
void send_Preamble(const uint8_t type,float *out, int *counterout)
{
float symb;
if(type) //pre-BERT
{
for(uint16_t i=0; i<(int)(192/2); i++) //40ms * 4800 = 192
{
symb=-3.0;
// write(STDOUT_FILENO, (uint8_t*)&symb, sizeof(float));
out[*counterout]=symb;
*counterout=(*counterout)+1;
symb=+3.0;
// write(STDOUT_FILENO, (uint8_t*)&symb, sizeof(float));
out[*counterout]=symb;
*counterout=(*counterout)+1;
}
}
else //pre-LSF
{
for(uint16_t i=0; i<(int)(192/2); i++) //40ms * 4800 = 192
{
symb=+3.0;
// write(STDOUT_FILENO, (uint8_t*)&symb, sizeof(float));
out[*counterout]=symb;
*counterout=(*counterout)+1;
symb=-3.0;
// write(STDOUT_FILENO, (uint8_t*)&symb, sizeof(float));
out[*counterout]=symb;
*counterout=(*counterout)+1;
}
}
}
// now ../M17_Implementations/SP5WWP/lib/lib.c:void send_syncword(const uint16_t syncword)
void send_Syncword(const uint16_t sword, float *out, int *counterout)
{
float symb;
for(uint8_t i=0; i<16; i+=2)
{
symb=symbol_map[(sword>>(14-i))&3];
// write(STDOUT_FILENO, (uint8_t*)&symb, sizeof(float));
out[*counterout]=symb;
*counterout=(*counterout)+1;
}
}
m17_coder::sptr
m17_coder::make(std::string src_id,std::string dst_id,short type,std::string meta, bool debug)
{
return gnuradio::get_initial_sptr
(new m17_coder_impl(src_id,dst_id,type,meta,debug));
}
/*
* The private constructor
*/
m17_coder_impl::m17_coder_impl(std::string src_id,std::string dst_id,short type,std::string meta, bool debug)
: gr::block("m17_coder",
gr::io_signature::make(1, 1, sizeof(char)),
gr::io_signature::make(1, 1, sizeof(float)))
, _meta(meta),_type(type), _debug(debug)
{ set_meta(meta);
set_src_id(src_id);
set_dst_id(dst_id);
set_type(type);
set_debug(debug);
set_output_multiple(192);
uint16_t ccrc=LSF_CRC(&lsf);
lsf.crc[0]=ccrc>>8;
lsf.crc[1]=ccrc&0xFF;
_got_lsf=0; //have we filled the LSF struct yet?
_fn=0; //16-bit Frame Number (for the stream mode)
}
void m17_coder_impl::set_debug(bool debug)
{_debug=debug;
if (_debug==true) printf("Debug true\n"); else printf("Debug false\n");
}
void m17_coder_impl::set_src_id(std::string src_id)
{int length;
for (int i=0;i<10;i++) {_src_id[i]=0;}
if (src_id.length()>9) length=9; else length=src_id.length();
for (int i=0;i<length;i++) {_src_id[i]=toupper(src_id.c_str()[i]);}
encode_callsign((uint64_t*)lsf.src,_src_id); // 6 byte ID <- 9 char callsign
uint16_t ccrc=LSF_CRC(&lsf);
lsf.crc[0]=ccrc>>8;
lsf.crc[1]=ccrc&0xFF;
}
void m17_coder_impl::set_dst_id(std::string dst_id)
{int length;
for (int i=0;i<10;i++) {_dst_id[i]=0;}
if (dst_id.length()>9) length=9; else length=dst_id.length();
for (int i=0;i<length;i++) {_dst_id[i]=toupper(dst_id.c_str()[i]);}
encode_callsign((uint64_t*)lsf.dst,_dst_id); // 6 byte ID <- 9 char callsign
uint16_t ccrc=LSF_CRC(&lsf);
lsf.crc[0]=ccrc>>8;
lsf.crc[1]=ccrc&0xFF;
}
void m17_coder_impl::set_meta(std::string meta)
{int length;
printf("new meta: %s\n",meta.c_str());fflush(stdout);
_meta.assign(meta);
if (meta.length()<14) length=meta.length(); else length=14;
for (int i=0;i<length;i++) {lsf.meta[i]=_meta[i];}
uint16_t ccrc=LSF_CRC(&lsf);
lsf.crc[0]=ccrc>>8;
lsf.crc[1]=ccrc&0xFF;
}
void m17_coder_impl::set_type(short type)
{_type=type;
lsf.type[0]=_type>>8; // MSB
lsf.type[1]=_type&0xff; // LSB
uint16_t ccrc=LSF_CRC(&lsf);
lsf.crc[0]=ccrc>>8;
lsf.crc[1]=ccrc&0xFF;
printf("new type: %hhd %hhd\n",lsf.type[1],lsf.type[0]);fflush(stdout);
}
/*
* Our virtual destructor.
*/
m17_coder_impl::~m17_coder_impl()
{
}
void
m17_coder_impl::forecast (int noutput_items, gr_vector_int &ninput_items_required)
{
ninput_items_required[0] = noutput_items/12; // 16 inputs -> 192 outputs
}
int
m17_coder_impl::general_work (int noutput_items,
gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const char *in = (const char *) input_items[0];
float *out = (float *) output_items[0];
int countin=0;
int countout=0;
uint8_t enc_bits[SYM_PER_PLD*2]; //type-2 bits, unpacked
uint8_t rf_bits[SYM_PER_PLD*2]; //type-4 bits, unpacked
uint8_t lich[6]; //48 bits packed raw, unencoded LICH
uint8_t lich_encoded[12]; //96 bits packed, encoded LICH
uint8_t data[16]; //raw payload, packed bits
uint8_t lich_cnt=0; //0..5 LICH counter, derived from the Frame Number
while (countout<noutput_items) {
if (countin+16<=noutput_items)
{if(_got_lsf) //stream frames
{
//we could discard the data we already have
for (int i=0;i<16;i++) {data[i]=in[countin];countin++;}
//send stream frame syncword
send_Syncword(SYNC_STR,out,&countout);
//derive the LICH_CNT from the Frame Number
lich_cnt=_fn%6;
//extract LICH from the whole LSF
switch(lich_cnt)
{
case 0:
lich[0]=lsf.dst[0];
lich[1]=lsf.dst[1];
lich[2]=lsf.dst[2];
lich[3]=lsf.dst[3];
lich[4]=lsf.dst[4];
break;
case 1:
lich[0]=lsf.dst[5];
lich[1]=lsf.src[0];
lich[2]=lsf.src[1];
lich[3]=lsf.src[2];
lich[4]=lsf.src[3];
break;
case 2:
lich[0]=lsf.src[4];
lich[1]=lsf.src[5];
lich[2]=lsf.type[0];
lich[3]=lsf.type[1];
lich[4]=lsf.meta[0];
break;
case 3:
lich[0]=lsf.meta[1];
lich[1]=lsf.meta[2];
lich[2]=lsf.meta[3];
lich[3]=lsf.meta[4];
lich[4]=lsf.meta[5];
break;
case 4:
lich[0]=lsf.meta[6];
lich[1]=lsf.meta[7];
lich[2]=lsf.meta[8];
lich[3]=lsf.meta[9];
lich[4]=lsf.meta[10];
break;
case 5:
lich[0]=lsf.meta[11];
lich[1]=lsf.meta[12];
lich[2]=lsf.meta[13];
lich[3]=lsf.crc[0];
lich[4]=lsf.crc[1];
break;
default:
;
break;
}
lich[5]=lich_cnt<<5;
//encode the LICH
uint32_t val;
val=golay24_encode((lich[0]<<4)|(lich[1]>>4));
lich_encoded[0]=(val>>16)&0xFF;
lich_encoded[1]=(val>>8)&0xFF;
lich_encoded[2]=(val>>0)&0xFF;
val=golay24_encode(((lich[1]&0x0F)<<8)|lich[2]);
lich_encoded[3]=(val>>16)&0xFF;
lich_encoded[4]=(val>>8)&0xFF;
lich_encoded[5]=(val>>0)&0xFF;
val=golay24_encode((lich[3]<<4)|(lich[4]>>4));
lich_encoded[6]=(val>>16)&0xFF;
lich_encoded[7]=(val>>8)&0xFF;
lich_encoded[8]=(val>>0)&0xFF;
val=golay24_encode(((lich[4]&0x0F)<<8)|lich[5]);
lich_encoded[9]=(val>>16)&0xFF;
lich_encoded[10]=(val>>8)&0xFF;
lich_encoded[11]=(val>>0)&0xFF;
//unpack LICH (12 bytes)
memset(enc_bits, 0, SYM_PER_PLD*2);
for(uint8_t i=0; i<12; i++)
{
for(uint8_t j=0; j<8; j++)
enc_bits[i*8+j]=(lich_encoded[i]>>(7-j))&1;
}
//encode the rest of the frame
conv_encode_stream_frame(&enc_bits[96], data, _fn);
//reorder bits
for(uint16_t i=0; i<SYM_PER_PLD*2; i++)
rf_bits[i]=enc_bits[intrl_seq[i]];
//randomize
for(uint16_t i=0; i<SYM_PER_PLD*2; i++)
{
if((rand_seq[i/8]>>(7-(i%8)))&1) //flip bit if '1'
{
if(rf_bits[i])
rf_bits[i]=0;
else
rf_bits[i]=1;
}
}
//send dummy symbols (debug)
/*float s=0.0;
for(uint8_t i=0; i<SYM_PER_PLD; i++) //40ms * 4800 - 8 (syncword)
write(STDOUT_FILENO, (uint8_t*)&s, sizeof(float));*/
float s;
for(uint16_t i=0; i<SYM_PER_PLD; i++) //40ms * 4800 - 8 (syncword)
{
s=symbol_map[rf_bits[2*i]*2+rf_bits[2*i+1]];
// write(STDOUT_FILENO, (uint8_t*)&s, sizeof(float));
out[countout]=s;
countout++;
}
/*printf("\tDATA: ");
for(uint8_t i=0; i<16; i++)
printf("%02X", data[i]);
printf("\n");*/
//increment the Frame Number
_fn++;
}
else //LSF
{
// for (int i=0;i<6;i++) {lsf.dst[i]=in[countin];countin++;}
// for (int i=0;i<6;i++) {lsf.src[i]=in[countin];countin++;}
// for (int i=0;i<2;i++) {lsf.type[i]=in[countin];countin++;}
// for (int i=0;i<14;i++) {lsf.meta[i]=in[countin];countin++;}
for (int i=0;i<16;i++) {data[i]=in[countin];countin++;}
//calculate LSF CRC
// uint16_t ccrc=LSF_CRC(&lsf);
// lsf.crc[0]=ccrc>>8;
// lsf.crc[1]=ccrc&0xFF;
_got_lsf=1;
// printf("got_lsf=1\n");
//encode LSF data
conv_encode_LSF(enc_bits, &lsf);
//send out the preamble and LSF
send_Preamble(0,out,&countout); //0 - LSF preamble, as opposed to 1 - BERT preamble
//send LSF syncword
send_Syncword(SYNC_LSF,out,&countout);
//reorder bits
for(uint16_t i=0; i<SYM_PER_PLD*2; i++)
rf_bits[i]=enc_bits[intrl_seq[i]];
//randomize
for(uint16_t i=0; i<SYM_PER_PLD*2; i++)
{
if((rand_seq[i/8]>>(7-(i%8)))&1) //flip bit if '1'
{
if(rf_bits[i])
rf_bits[i]=0;
else
rf_bits[i]=1;
}
}
float s;
for(uint16_t i=0; i<SYM_PER_PLD; i++) //40ms * 4800 - 8 (syncword)
{
s=symbol_map[rf_bits[2*i]*2+rf_bits[2*i+1]];
out[countout]=s;
countout++;
}
/*printf("DST: ");
for(uint8_t i=0; i<6; i++)
printf("%02X", lsf.dst[i]);
printf(" SRC: ");
for(uint8_t i=0; i<6; i++)
printf("%02X", lsf.src[i]);
printf(" TYPE: ");
for(uint8_t i=0; i<2; i++)
printf("%02X", lsf.type[i]);
printf(" META: ");
for(uint8_t i=0; i<14; i++)
printf("%02X", lsf.meta[i]);
printf(" CRC: ");
for(uint8_t i=0; i<2; i++)
printf("%02X", lsf.crc[i]);
printf("\n");*/
}
}
}
// Tell runtime system how many input items we consumed on
// each input stream.
consume_each (countin);
// printf(" noutput_items=%d countin=%d countout=%d\n",noutput_items,countin,countout);
// Tell runtime system how many output items we produced.
return countout;
}
} /* namespace m17 */
} /* namespace gr */
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