119 lines
3.3 KiB
C++
119 lines
3.3 KiB
C++
/* -*- c++ -*- */
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/*
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* GNU Radio interface for halfrate ambe encoder
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*
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* (C) Copyright 2016 Max H. Parke KA1RBI
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*
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* This file is part of OP25
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*
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* This 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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* This software 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 this software; 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 <gnuradio/io_signature.h>
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#include "ambe_encoder_sb_impl.h"
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#include <vector>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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namespace gr {
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namespace op25_repeater {
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ambe_encoder_sb::sptr
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ambe_encoder_sb::make(int verbose_flag)
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{
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return gnuradio::get_initial_sptr
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(new ambe_encoder_sb_impl(verbose_flag));
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}
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//////////////////////////////////////////////////////////////////////////
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// accepts buffers of 160 samples (short format)
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// outputs one ambe codeword per 160 samples (36 dibits, char format)
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static const int MIN_IN = 1;
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static const int MIN_OUT = 1;
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static const int MAX_IN = 1;
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static const int MAX_OUT = 1;
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/*
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* The private constructor
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*/
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ambe_encoder_sb_impl::ambe_encoder_sb_impl(int verbose_flag)
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: gr::block("ambe_encoder_sb",
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gr::io_signature::make (MIN_IN, MAX_IN, sizeof(short)),
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gr::io_signature::make (MIN_OUT, MAX_OUT, 36))
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{
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set_history(160);
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}
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/*
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* Our virtual destructor.
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*/
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ambe_encoder_sb_impl::~ambe_encoder_sb_impl()
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{
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}
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void
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ambe_encoder_sb_impl::forecast(int nof_output_items, gr_vector_int &nof_input_items_reqd)
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{
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/* produces 1 36-byte-block sample per 160 samples input
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*/
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const size_t nof_inputs = nof_input_items_reqd.size();
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const int nof_samples_reqd = 160.0 * (nof_output_items);
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std::fill(&nof_input_items_reqd[0], &nof_input_items_reqd[nof_inputs], nof_samples_reqd);
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}
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int
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ambe_encoder_sb_impl::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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int nframes = ninput_items[0] / 160;
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nframes = std::min(nframes, noutput_items);
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if (nframes < 1) return 0;
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short *in = (short *) input_items[0];
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uint8_t *out = reinterpret_cast<uint8_t*>(output_items[0]);
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for (int n=0; n<nframes; n++) {
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d_encoder.encode(&in[n*160], &out[n*36]);
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}
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// Tell runtime system how many input items we consumed on
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// each input stream.
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consume_each (nframes * 160);
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// Tell runtime system how many output items we produced.
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return (nframes);
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}
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void
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ambe_encoder_sb_impl::set_gain_adjust(float gain_adjust) {
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d_encoder.set_gain_adjust(gain_adjust);
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}
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} /* namespace op25_repeater */
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} /* namespace gr */
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