Mirror/aicodix___modem
1
0
Fork 0
mirror of https://github.com/aicodix/modem.git synced 2026-04-27 14:30:34 +00:00
Code Issues Projects Releases Packages Wiki Activity

moved crc0 and data array to common struct

Browse source
This commit is contained in:
Ahmet Inan 2025-07-02 12:09:38 +02:00
commit 5b99d357bf
3 changed files with 14 additions and 17 deletions
Download patch file Download diff file Expand all files Collapse all files

14
encode.cc
View file

@ -17,7 +17,6 @@ Copyright 2021 Ahmet Inan <inan@aicodix.de>
#include "wav.hh"
#include "pcm.hh"
#include "mls.hh"
#include "crc.hh"
#include "psk.hh"
#include "qam.hh"
#include "polar_encoder.hh"
@ -31,9 +30,7 @@ struct Encoder : public Common
DSP::WritePCM<value> *pcm;
DSP::FastFourierTransform<symbol_len, cmplx, -1> fwd;
DSP::FastFourierTransform<symbol_len, cmplx, 1> bwd;
CODE::CRC<uint32_t> crc0;
CODE::PolarEncoder<code_type> polar_encoder;
uint8_t input_data[data_max];
code_type code[bits_max], perm[bits_max], mesg[bits_max];
cmplx fdom[symbol_len];
cmplx tdom[symbol_len];
@ -229,8 +226,7 @@ struct Encoder : public Common
for (int i = guard_len / 4 + guard_len / 2; i < guard_len; ++i)
weight[i] = 1;
}
Encoder(DSP::WritePCM<value> *pcm, const char *const *input_names, int input_count, int freq_off, int oper_mode) :
pcm(pcm), crc0(0x8F6E37A0)
Encoder(DSP::WritePCM<value> *pcm, const char *const *input_names, int input_count, int freq_off, int oper_mode) : pcm(pcm)
{
setup(oper_mode);
int offset = (freq_off * symbol_len) / rate;
@ -261,16 +257,16 @@ struct Encoder : public Common
continue;
}
for (int i = 0; i < data_bytes; ++i)
input_data[i] = std::max(input_file.get(), 0);
data[i] = std::max(input_file.get(), 0);
CODE::Xorshift32 scrambler;
for (int i = 0; i < data_bytes; ++i)
input_data[i] ^= scrambler();
data[i] ^= scrambler();
schmidl_cox();
for (int i = 0; i < data_bits; ++i)
mesg[i] = nrz(CODE::get_le_bit(input_data, i));
mesg[i] = nrz(CODE::get_le_bit(data, i));
crc0.reset();
for (int i = 0; i < data_bytes; ++i)
crc0(input_data[i]);
crc0(data[i]);
for (int i = 0; i < 32; ++i)
mesg[i+data_bits] = nrz((crc0()>>i)&1);
polar_encoder(code, mesg, frozen_bits, code_order);