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/* -*- c++ -*- */
/*
* Copyright 2004,2006 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gr_squelch_base_cc.h>
#include <gr_io_signature.h>
gr_squelch_base_cc::gr_squelch_base_cc(const char *name, int ramp, bool gate) :
gr_block(name,
gr_make_io_signature(1, 1, sizeof(gr_complex)),
gr_make_io_signature(1, 1, sizeof(gr_complex)))
{
set_ramp(ramp);
set_gate(gate);
d_state = ST_MUTED;
d_envelope = d_ramp ? 0.0 : 1.0;
d_ramped = 0;
}
int gr_squelch_base_cc::general_work(int noutput_items,
gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const gr_complex *in = (const gr_complex *) input_items[0];
gr_complex *out = (gr_complex *) output_items[0];
int j = 0;
for (int i = 0; i < noutput_items; i++) {
update_state(in[i]);
// Adjust envelope based on current state
switch(d_state) {
case ST_MUTED:
if (!mute())
d_state = d_ramp ? ST_ATTACK : ST_UNMUTED; // If not ramping, go straight to unmuted
break;
case ST_UNMUTED:
if (mute())
d_state = d_ramp ? ST_DECAY : ST_MUTED; // If not ramping, go straight to muted
break;
case ST_ATTACK:
d_envelope = 0.5-std::cos(M_PI*(++d_ramped)/d_ramp)/2.0; // FIXME: precalculate window for speed
if (d_ramped >= d_ramp) { // use >= in case d_ramp is set to lower value elsewhere
d_state = ST_UNMUTED;
d_envelope = 1.0;
}
break;
case ST_DECAY:
d_envelope = 0.5-std::cos(M_PI*(--d_ramped)/d_ramp)/2.0; // FIXME: precalculate window for speed
if (d_ramped == 0.0)
d_state = ST_MUTED;
break;
};
// If unmuted, copy input times envelope to output
// Otherwise, if not gating, copy zero to output
if (d_state != ST_MUTED)
out[j++] = in[i]*gr_complex(d_envelope, 0.0);
else
if (!d_gate)
out[j++] = 0.0;
}
consume_each(noutput_items); // Use all the inputs
return j; // But only report outputs copied
}
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