GNU Radio 2.x: gr_squelch_base

00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2006 Free Software Foundation, Inc.
00004  * 
00005  * This file is part of GNU Radio
00006  * 
00007  * GNU Radio is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 2, or (at your option)
00010  * any later version.
00011  * 
00012  * GNU Radio is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  * 
00017  * You should have received a copy of the GNU General Public License
00018  * along with GNU Radio; see the file COPYING.  If not, write to
00019  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00020  * Boston, MA 02111-1307, USA.
00021  */
00022 
00023 #ifndef INCLUDED_GR_SQUELCH_BASE_FF_H
00024 #define INCLUDED_GR_SQUELCH_BASE_FF_H
00025 
00026 #include <gr_block.h>
00027 
00028 class gr_squelch_base_ff : public gr_block
00029 {
00030 private:
00031   int    d_ramp;
00032   int    d_ramped;
00033   bool   d_gate;
00034   double d_envelope;
00035   enum { ST_MUTED, ST_ATTACK, ST_UNMUTED, ST_DECAY } d_state;
00036 
00037 protected:
00038   virtual void update_state(const float &sample) {};
00039   virtual bool mute() const { return false; };
00040 
00041 public:
00042   gr_squelch_base_ff(const char *name, int ramp, bool gate);
00043 
00044   int ramp() const { return d_ramp; }
00045   void set_ramp(int ramp) { d_ramp = ramp; }
00046   bool gate() const { return d_gate; }
00047   void set_gate(bool gate) { d_gate = gate; }
00048   bool unmuted() const { return (d_state == ST_UNMUTED || d_state == ST_ATTACK); }
00049 
00050   virtual std::vector<float> squelch_range() const = 0;
00051 
00052   int general_work (int noutput_items,
00053                     gr_vector_int &ninput_items,
00054                     gr_vector_const_void_star &input_items,
00055                     gr_vector_void_star &output_items);
00056 };
00057 
00058 #endif /* INCLUDED_GR_SQUELCH_BASE_FF_H */
gr_squelch_base_ff.h
