94 lines
2.8 KiB
C++
94 lines
2.8 KiB
C++
/* -*- c++ -*- */
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/*
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* Copyright 2004,2006 Free Software Foundation, Inc.
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*
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* This file is part of GNU Radio
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*
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* GNU Radio is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* GNU Radio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Radio; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <repeater_squelch_base_ff.h>
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#include <gr_io_signature.h>
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repeater_squelch_base_ff::repeater_squelch_base_ff(const char *name, int ramp, bool gate) :
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gr_block(name,
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gr_make_io_signature(1, 1, sizeof(float)),
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gr_make_io_signature(1, 1, sizeof(float)))
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{
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set_ramp(ramp);
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set_gate(gate);
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d_state = ST_MUTED;
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d_envelope = d_ramp ? 0.0 : 1.0;
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d_ramped = 0;
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}
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int repeater_squelch_base_ff::general_work(int noutput_items,
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gr_vector_int &ninput_items,
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gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items)
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{
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const float *in = (const float *) input_items[0];
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float *out = (float *) output_items[0];
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int j = 0;
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for (int i = 0; i < noutput_items; i++) {
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update_state(in[i]);
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// Adjust envelope based on current state
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switch(d_state) {
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case ST_MUTED:
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if (!mute())
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d_state = d_ramp ? ST_ATTACK : ST_UNMUTED; // If not ramping, go straight to unmuted
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break;
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case ST_UNMUTED:
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if (mute())
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d_state = d_ramp ? ST_DECAY : ST_MUTED; // If not ramping, go straight to muted
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break;
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case ST_ATTACK:
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d_envelope = 0.5-std::cos(M_PI*(++d_ramped)/d_ramp)/2.0; // FIXME: precalculate window for speed
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if (d_ramped >= d_ramp) { // use >= in case d_ramp is set to lower value elsewhere
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d_state = ST_UNMUTED;
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d_envelope = 1.0;
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}
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break;
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case ST_DECAY:
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d_envelope = 0.5-std::cos(M_PI*(--d_ramped)/d_ramp)/2.0; // FIXME: precalculate window for speed
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if (d_ramped == 0.0)
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d_state = ST_MUTED;
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break;
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};
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// If unmuted, copy input times envelope to output
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// Otherwise, if not gating, copy zero to output
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if (d_state != ST_MUTED)
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out[j++] = in[i]*d_envelope;
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else
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if (!d_gate)
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out[j++] = 0.0;
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}
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consume_each(noutput_items); // Use all the inputs
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return j; // But only report outputs copied
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}
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