184 lines
6.3 KiB
C++
184 lines
6.3 KiB
C++
/* -*- c++ -*- */
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/*
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* GNU Radio interface for Pavel Yazev's Project 25 IMBE Encoder/Decoder
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*
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* Copyright 2009 Pavel Yazev E-mail: pyazev@gmail.com
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* Copyright 2009, 2010, 2011, 2012, 2013, 2014 KA1RBI
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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 "vocoder_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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static const int FRAGMENT_SIZE = 864;
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vocoder::sptr
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vocoder::make(bool encode_flag, bool verbose_flag, int stretch_amt, char* udp_host, int udp_port, bool raw_vectors_flag)
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{
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return gnuradio::get_initial_sptr
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(new vocoder_impl(encode_flag, verbose_flag, stretch_amt, udp_host, udp_port, raw_vectors_flag));
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}
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//////////////////////////////////////////////////////////////
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// enc/dec udp operation
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// dec no byte input; short output
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// dec yes byte input; null output
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// enc no short input; char output
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// enc yes short input; null output
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#define M_IN(encode_flag, udp_port) (1)
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#define M_OUT(encode_flag, udp_port) ((udp_port) ? 0 : 1)
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#define S_IN(encode_flag, udp_port) ((encode_flag) ? sizeof(int16_t) : sizeof(uint8_t))
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#define S_OUT(encode_flag, udp_port) ((udp_port) ? 0 : ((encode_flag) ? sizeof(uint8_t) : sizeof(int16_t)))
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/*
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* The private constructor
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*/
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vocoder_impl::vocoder_impl(bool encode_flag, bool verbose_flag, int stretch_amt, char* udp_host, int udp_port, bool raw_vectors_flag)
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: gr::block("vocoder",
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gr::io_signature::make (M_IN(encode_flag, udp_port), M_IN(encode_flag, udp_port), S_IN(encode_flag, udp_port)),
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gr::io_signature::make (M_OUT(encode_flag, udp_port), M_OUT(encode_flag, udp_port), S_OUT(encode_flag, udp_port))),
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output_queue(),
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output_queue_decode(),
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opt_udp_port(udp_port),
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opt_encode_flag(encode_flag),
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op25audio(udp_host, udp_port, 0),
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p1voice_encode(verbose_flag, stretch_amt, op25audio, raw_vectors_flag, output_queue),
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p1voice_decode(verbose_flag, op25audio, output_queue_decode)
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{
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if (opt_encode_flag)
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set_output_multiple(FRAGMENT_SIZE);
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}
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/*
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* Our virtual destructor.
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*/
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vocoder_impl::~vocoder_impl()
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{
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}
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void
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vocoder_impl::forecast(int nof_output_items, gr_vector_int &nof_input_items_reqd)
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{
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/* When encoding, this block consumes 8000 symbols/s and produces 4800
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* samples/s. That's a sampling rate of 5/3 or 1.66667.
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*
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* When decoding, the block consumes one line of text per voice codeword.
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* Each line of text is exactly 32 bytes. It outputs 160 samples for each
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* codeword; the ratio is thus 32/160 = 0.2.
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*
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* Thanks to Matt Mills for catching a bug where this value wasn't set correctly
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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 = (opt_encode_flag) ? (1.66667 * nof_output_items) : (0.2 * 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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vocoder_impl::general_work_decode (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 char *in = (const char *) input_items[0];
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p1voice_decode.rxchar(in, ninput_items[0]);
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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 (ninput_items[0]);
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uint16_t *out = reinterpret_cast<uint16_t*>(output_items[0]);
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const int n = std::min(static_cast<int>(output_queue_decode.size()), noutput_items);
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if(0 < n) {
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copy(output_queue_decode.begin(), output_queue_decode.begin() + n, out);
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output_queue_decode.erase(output_queue_decode.begin(), output_queue_decode.begin() + n);
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}
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// Tell runtime system how many output items we produced.
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return n;
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}
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int
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vocoder_impl::general_work_encode (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 short *in = (const short *) input_items[0];
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const int noutput_fragments = noutput_items / FRAGMENT_SIZE;
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const int fragments_available = output_queue.size() / FRAGMENT_SIZE;
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const int nsamples_consume = std::min(ninput_items[0], std::max(0,(noutput_fragments - fragments_available) * 9 * 160));
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if (nsamples_consume > 0) {
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p1voice_encode.compress_samp(in, nsamples_consume);
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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 (nsamples_consume);
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}
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if (op25audio.enabled()) // in udp option, we are a gr sink only
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return 0;
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uint8_t *out = reinterpret_cast<uint8_t*>(output_items[0]);
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const int n = std::min(static_cast<int>(output_queue.size()), noutput_items);
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if(0 < n) {
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copy(output_queue.begin(), output_queue.begin() + n, out);
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output_queue.erase(output_queue.begin(), output_queue.begin() + n);
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}
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// Tell runtime system how many output items we produced.
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return n;
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}
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int
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vocoder_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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if (opt_encode_flag)
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return general_work_encode(noutput_items, ninput_items, input_items, output_items);
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else
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return general_work_decode(noutput_items, ninput_items, input_items, output_items);
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}
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void
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vocoder_impl::set_gain_adjust(float gain_adjust) {
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p1voice_encode.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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