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/* -*- c++ -*- */
/*
* Copyright 2014 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "atsc_equalizer_impl.h"
#include "atsc_pnXXX_impl.h"
#include "atsc_types.h"
#include <gnuradio/io_signature.h>
#include <volk/volk.h>
#include <fstream>
namespace gr {
namespace dtv {
atsc_equalizer::sptr atsc_equalizer::make()
{
return gnuradio::make_block_sptr<atsc_equalizer_impl>();
}
static float bin_map(int bit) { return bit ? +5 : -5; }
static void init_field_sync_common(float* p, int mask)
{
int i = 0;
p[i++] = bin_map(1); // data segment sync pulse
p[i++] = bin_map(0);
p[i++] = bin_map(0);
p[i++] = bin_map(1);
for (int j = 0; j < 511; j++) // PN511
p[i++] = bin_map(atsc_pn511[j]);
for (int j = 0; j < 63; j++) // PN63
p[i++] = bin_map(atsc_pn63[j]);
for (int j = 0; j < 63; j++) // PN63, toggled on field 2
p[i++] = bin_map(atsc_pn63[j] ^ mask);
for (int j = 0; j < 63; j++) // PN63
p[i++] = bin_map(atsc_pn63[j]);
}
atsc_equalizer_impl::atsc_equalizer_impl()
: gr::block("dtv_atsc_equalizer",
io_signature::make2(
2, 2, ATSC_DATA_SEGMENT_LENGTH * sizeof(float), sizeof(plinfo)),
io_signature::make2(
2, 2, ATSC_DATA_SEGMENT_LENGTH * sizeof(float), sizeof(plinfo)))
{
init_field_sync_common(training_sequence1, 0);
init_field_sync_common(training_sequence2, 1);
d_taps.resize(NTAPS, 0.0f);
const int alignment_multiple = volk_get_alignment() / sizeof(float);
set_alignment(std::max(1, alignment_multiple));
}
atsc_equalizer_impl::~atsc_equalizer_impl() {}
std::vector<float> atsc_equalizer_impl::taps() const { return d_taps; }
std::vector<float> atsc_equalizer_impl::data() const
{
std::vector<float> ret(&data_mem2[0], &data_mem2[ATSC_DATA_SEGMENT_LENGTH - 1]);
return ret;
}
void atsc_equalizer_impl::filterN(const float* input_samples,
float* output_samples,
int nsamples)
{
for (int j = 0; j < nsamples; j++) {
output_samples[j] = 0;
volk_32f_x2_dot_prod_32f(
&output_samples[j], &input_samples[j], &d_taps[0], NTAPS);
}
}
void atsc_equalizer_impl::adaptN(const float* input_samples,
const float* training_pattern,
float* output_samples,
int nsamples)
{
static const double BETA = 0.00005; // FIXME figure out what this ought to be
// FIXME add gear-shifting
for (int j = 0; j < nsamples; j++) {
output_samples[j] = 0;
volk_32f_x2_dot_prod_32f(
&output_samples[j], &input_samples[j], &d_taps[0], NTAPS);
float e = output_samples[j] - training_pattern[j];
// update taps...
float tmp_taps[NTAPS];
volk_32f_s32f_multiply_32f(tmp_taps, &input_samples[j], BETA * e, NTAPS);
volk_32f_x2_subtract_32f(&d_taps[0], &d_taps[0], tmp_taps, NTAPS);
}
}
int atsc_equalizer_impl::general_work(int noutput_items,
gr_vector_int& ninput_items,
gr_vector_const_void_star& input_items,
gr_vector_void_star& output_items)
{
auto in = static_cast<const float*>(input_items[0]);
auto out = static_cast<float*>(output_items[0]);
auto in_pl = static_cast<const plinfo*>(input_items[1]);
auto out_pl = static_cast<plinfo*>(output_items[1]);
int output_produced = 0;
int i = 0;
std::vector<tag_t> tags;
plinfo pli_in;
if (d_buff_not_filled) {
memset(&data_mem[0], 0, NPRETAPS * sizeof(float));
memcpy(&data_mem[NPRETAPS],
in + i * ATSC_DATA_SEGMENT_LENGTH,
ATSC_DATA_SEGMENT_LENGTH * sizeof(float));
d_flags = in_pl[i].flags();
d_segno = in_pl[i].segno();
d_buff_not_filled = false;
i++;
}
for (; i < noutput_items; i++) {
memcpy(&data_mem[ATSC_DATA_SEGMENT_LENGTH + NPRETAPS],
in + i * ATSC_DATA_SEGMENT_LENGTH,
(NTAPS - NPRETAPS) * sizeof(float));
if (d_segno == -1) {
if (d_flags & 0x0010) {
adaptN(data_mem, training_sequence2, data_mem2, KNOWN_FIELD_SYNC_LENGTH);
} else if (!(d_flags & 0x0010)) {
adaptN(data_mem, training_sequence1, data_mem2, KNOWN_FIELD_SYNC_LENGTH);
}
} else {
filterN(data_mem, data_mem2, ATSC_DATA_SEGMENT_LENGTH);
memcpy(&out[output_produced * ATSC_DATA_SEGMENT_LENGTH],
data_mem2,
ATSC_DATA_SEGMENT_LENGTH * sizeof(float));
plinfo pli_out(d_flags, d_segno);
out_pl[output_produced++] = pli_out;
}
memcpy(data_mem, &data_mem[ATSC_DATA_SEGMENT_LENGTH], NPRETAPS * sizeof(float));
memcpy(&data_mem[NPRETAPS],
in + i * ATSC_DATA_SEGMENT_LENGTH,
ATSC_DATA_SEGMENT_LENGTH * sizeof(float));
d_flags = in_pl[i].flags();
d_segno = in_pl[i].segno();
}
consume_each(noutput_items);
return output_produced;
}
void atsc_equalizer_impl::setup_rpc()
{
#ifdef GR_CTRLPORT
add_rpc_variable(
rpcbasic_sptr(new rpcbasic_register_get<atsc_equalizer, std::vector<float>>(
alias(),
"taps",
&atsc_equalizer::taps,
pmt::make_f32vector(1, -10),
pmt::make_f32vector(1, 10),
pmt::make_f32vector(1, 0),
"",
"Equalizer Taps",
RPC_PRIVLVL_MIN,
DISPTIME)));
add_rpc_variable(
rpcbasic_sptr(new rpcbasic_register_get<atsc_equalizer, std::vector<float>>(
alias(),
"data",
&atsc_equalizer::data,
pmt::make_f32vector(1, -10),
pmt::make_f32vector(1, 10),
pmt::make_f32vector(1, 0),
"",
"Post-equalizer Data",
RPC_PRIVLVL_MIN,
DISPTIME)));
#endif /* GR_CTRLPORT */
}
} /* namespace dtv */
} /* namespace gr */
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