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/* -*- c++ -*- */
/*
* Copyright 2002 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio 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.
*
* GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include <GrAtscSegSymSyncImpl.h>
#include <GrAtscSegSymSyncImpl_export.h>
#include <cmath>
#include <assert.h>
GrAtscSegSymSyncImpl::GrAtscSegSymSyncImpl (
double nominal_ratio_of_rx_clock_to_symbol_freq)
: d_interp (nominal_ratio_of_rx_clock_to_symbol_freq)
{
// set approximate decimation rate for superclass's benefit
decimation = (int) rint (nominal_ratio_of_rx_clock_to_symbol_freq);
history = 1500; // spare input samples in case we need them.
d_sssr.reset ();
d_interp.reset ();
d_next_input = 0;
d_rx_clock_to_symbol_freq = nominal_ratio_of_rx_clock_to_symbol_freq;
}
GrAtscSegSymSyncImpl::~GrAtscSegSymSyncImpl ()
{
// Nop
}
void
GrAtscSegSymSyncImpl::pre_initialize ()
{
setSamplingFrequency (
getInputSamplingFrequencyN (0) / d_rx_clock_to_symbol_freq);
}
int
GrAtscSegSymSyncImpl::forecast (VrSampleRange output,
VrSampleRange inputs[])
{
assert (numberInputs == 1); // I hate these free references to
// superclass's instance variables...
inputs[0].index = d_next_input;
inputs[0].size =
((long unsigned int) (output.size * d_rx_clock_to_symbol_freq)
+ history - 1);
return 0;
}
int
GrAtscSegSymSyncImpl::work (VrSampleRange output, void *ao[],
VrSampleRange inputs[], void *ai[])
{
#if 0
float *input_samples = ((float **) ai)[0];
float *output_samples = ((float **) ao)[0];
atsc::syminfo *output_info = ((atsc::syminfo **) ao)[1];
// FIXME finish...
#endif
assert (0);
return output.size;
}
void
GrAtscSegSymSyncImpl::reset ()
{
d_sssr.reset ();
d_interp.reset ();
}
/*
* Exported constructor.
* Doesn't expose any of the internals or our compile time dependencies.
*/
GrAtscSegSymSync *
create_GrAtscSegSymSyncImpl (double nominal_ratio_of_rx_clock_to_symbol_freq)
{
return new GrAtscSegSymSyncImpl (nominal_ratio_of_rx_clock_to_symbol_freq);
}
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