124 lines
3.6 KiB
C++
124 lines
3.6 KiB
C++
/* -*- Mode: C++ -*- */
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/*
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* Copyright 2010, KA1RBI
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*
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* This file is part of OP25.
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*
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* OP25 is free software; you can redistribute it and/or modify it
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* 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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* OP25 is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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* 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 OP25; see the file COPYING. If not, write to the Free
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* Software Foundation, Inc., 51 Franklin Street, Boston, MA
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* 02110-1301, USA.
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*/
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/*
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* config.h is generated by configure. It contains the results
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* of probing for features, options etc. It should be the first
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* file included in your .cc file.
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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 <op25_fsk4_slicer_fb.h>
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#include <gr_io_signature.h>
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#include <stdio.h>
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/*
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* Create a new instance of op25_fsk4_slicer_fb and return
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* a boost shared_ptr. This is effectively the public constructor.
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*/
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op25_fsk4_slicer_fb_sptr
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op25_make_fsk4_slicer_fb(const std::vector<float> &slice_levels)
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{
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return op25_fsk4_slicer_fb_sptr(new op25_fsk4_slicer_fb (slice_levels));
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}
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/*
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* Specify constraints on number of input and output streams.
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* This info is used to construct the input and output signatures
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* (2nd & 3rd args to gr_block's constructor). The input and
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* output signatures are used by the runtime system to
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* check that a valid number and type of inputs and outputs
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* are connected to this block. In this case, we accept
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* only 1 input and 1 output.
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*/
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static const int MIN_IN = 1; // mininum number of input streams
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static const int MAX_IN = 1; // maximum number of input streams
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static const int MIN_OUT = 1; // minimum number of output streams
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static const int MAX_OUT = 1; // maximum number of output streams
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/*
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* The private constructor
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*/
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op25_fsk4_slicer_fb::op25_fsk4_slicer_fb(const std::vector<float> &slice_levels)
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: gr_sync_block("fsk4_slicer_fb",
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gr_make_io_signature(MIN_IN, MAX_IN, sizeof(float)),
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gr_make_io_signature(MIN_OUT, MAX_OUT, sizeof(unsigned char)))
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{
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d_slice_levels[0] = slice_levels[0];
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d_slice_levels[1] = slice_levels[1];
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d_slice_levels[2] = slice_levels[2];
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d_slice_levels[3] = slice_levels[3];
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}
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/*
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* Our virtual destructor.
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*/
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op25_fsk4_slicer_fb::~op25_fsk4_slicer_fb()
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{
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// nothing else required in this example
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}
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int
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op25_fsk4_slicer_fb::work(int noutput_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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unsigned char *out = (unsigned char *) output_items[0];
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for(int i = 0; i < noutput_items; i++){
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#if 0
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if(in[i] < -2.0) {
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out[i] = 3;
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} else if(in[i] < 0.0) {
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out[i] = 2;
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} else if(in[i] < 2.0) {
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out[i] = 0;
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} else {
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out[i] = 1;
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}
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#endif
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uint8_t dibit;
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float sym = in[i];
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if(d_slice_levels[3] < 0) {
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dibit = 1;
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if(d_slice_levels[3] <= sym && sym < d_slice_levels[0])
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dibit = 3;
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} else {
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dibit = 3;
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if(d_slice_levels[2] <= sym && sym < d_slice_levels[3])
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dibit = 1;
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}
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if(d_slice_levels[0] <= sym && sym < d_slice_levels[1])
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dibit = 2;
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if(d_slice_levels[1] <= sym && sym < d_slice_levels[2])
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dibit = 0;
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out[i] = dibit;
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}
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// Tell runtime system how many output items we produced.
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return noutput_items;
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}
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