GNU Radio 3.5.3.1 C++ API
gr_squelch_base_cc.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2006 Free Software Foundation, Inc.
4  *
5  * This file is part of GNU Radio
6  *
7  * GNU Radio is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 3, or (at your option)
10  * any later version.
11  *
12  * GNU Radio is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with GNU Radio; see the file COPYING. If not, write to
19  * the Free Software Foundation, Inc., 51 Franklin Street,
20  * Boston, MA 02110-1301, USA.
21  */
22 
23 #ifndef INCLUDED_GR_SQUELCH_BASE_CC_H
24 #define INCLUDED_GR_SQUELCH_BASE_CC_H
25 
26 #include <gr_core_api.h>
27 #include <gr_block.h>
28 
30 {
31 private:
32  int d_ramp;
33  int d_ramped;
34  bool d_gate;
35  double d_envelope;
36  enum { ST_MUTED, ST_ATTACK, ST_UNMUTED, ST_DECAY } d_state;
37 
38 protected:
39  virtual void update_state(const gr_complex &sample) {};
40  virtual bool mute() const { return false; };
41 
42 public:
43  gr_squelch_base_cc(const char *name, int ramp, bool gate);
44 
45  int ramp() const { return d_ramp; }
46  void set_ramp(int ramp) { d_ramp = ramp; }
47  bool gate() const { return d_gate; }
48  void set_gate(bool gate) { d_gate = gate; }
49  bool unmuted() const { return (d_state == ST_UNMUTED || d_state == ST_ATTACK); }
50 
51  virtual std::vector<float> squelch_range() const = 0;
52 
53  int general_work (int noutput_items,
54  gr_vector_int &ninput_items,
55  gr_vector_const_void_star &input_items,
56  gr_vector_void_star &output_items);
57 };
58 
59 #endif /* INCLUDED_GR_SQUELCH_BASE_CC_H */