File: freedv_rx_ss_impl.cc

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/* -*- c++ -*- */
/*
 * Copyright 2016-2018 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * GNU Radio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3, or (at your option)
 * any later version.
 *
 * GNU Radio is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "freedv_rx_ss_impl.h"

#include <gnuradio/io_signature.h>
#include <stdexcept>
#include <assert.h>

extern "C" {
    void put_next_rx_char(void *callback_state, char c) {
      struct freedv_rx_callback_state* pstate;

      pstate = (struct freedv_rx_callback_state*) callback_state;
      if (pstate->ftxt != NULL) {
        //fprintf(pstate->ftxt, "%c\n", c);
      }
      return;
    }
}


namespace gr {
  namespace vocoder {

    freedv_rx_ss::sptr
    freedv_rx_ss::make(int mode, float squelch_thresh, int interleave_frames)
    {
      return gnuradio::get_initial_sptr
        (new freedv_rx_ss_impl(mode, squelch_thresh, interleave_frames));
    }

    freedv_rx_ss_impl::freedv_rx_ss_impl (int mode, float squelch_thresh, int interleave_frames)
      : gr::block("vocoder_freedv_rx_ss",
              io_signature::make(1, 1, sizeof(short)),
              io_signature::make(1, 1, sizeof(short))),
        d_mode(mode), d_squelch_thresh(squelch_thresh), d_interleave_frames(interleave_frames)
    {
#ifdef FREEDV_MODE_700D
      if (mode == FREEDV_MODE_700D) {
      d_adv.interleave_frames = interleave_frames;
      if((d_freedv = freedv_open_advanced(mode, &d_adv)) ==NULL)
	throw std::runtime_error("freedv_tx_ss_impl: freedv_open_advanced failed");
      } else {
	if((d_freedv = freedv_open(mode)) == NULL)
	  throw std::runtime_error("freedv_tx_ss_impl: freedv_open failed");
      }
#else
      if((d_freedv = freedv_open(mode)) == NULL)
        throw std::runtime_error("freedv_rx_ss_impl: freedv_open failed");
#endif
      freedv_set_snr_squelch_thresh(d_freedv, d_squelch_thresh);
      freedv_set_squelch_en(d_freedv, 0);
      freedv_set_callback_txt(d_freedv, put_next_rx_char, NULL, (void *) &d_cb_state);
      d_speech_samples = freedv_get_n_speech_samples(d_freedv);
      d_max_modem_samples = freedv_get_n_max_modem_samples(d_freedv);
      d_nin = freedv_nin(d_freedv);
      set_output_multiple(d_max_modem_samples);
    }

    freedv_rx_ss_impl::~freedv_rx_ss_impl()
    {
      int total_bits;
      int total_bit_errors;

      if (freedv_get_test_frames(d_freedv)) {
        total_bits = freedv_get_total_bits(d_freedv);
        total_bit_errors = freedv_get_total_bit_errors(d_freedv);
        fprintf(stderr, "bits: %d errors: %d BER: %3.2f\n", total_bits, total_bit_errors, (1.0*total_bit_errors)/total_bits);
      }
      freedv_close(d_freedv);
    }

    void
    freedv_rx_ss_impl::forecast(int noutput_items,
                                gr_vector_int &ninput_items_required)
    {
      unsigned ninputs = ninput_items_required.size();
      for(unsigned i = 0; i < ninputs; i++)
        ninput_items_required[i] = std::max(d_nin, noutput_items);
    }

    int
    freedv_rx_ss_impl::general_work(int noutput_items,
                                    gr_vector_int &ninput_items,
                                    gr_vector_const_void_star &input_items,
                                    gr_vector_void_star &output_items)
    {
      short *in = (short *) input_items[0];
      short *out = (short *) output_items[0];

      int in_offset = 0, out_offset = 0;

      while ((noutput_items - out_offset) >= d_max_modem_samples
              && (ninput_items[0] - in_offset) >= d_nin) {
        d_nout = freedv_rx(d_freedv, out + out_offset, in + in_offset);
        out_offset += d_nout;
        in_offset += d_nin;
        d_nin = freedv_nin(d_freedv);
      }

      freedv_get_modem_stats(d_freedv, &d_sync, &d_snr_est);
      freedv_get_modem_extended_stats(d_freedv, &d_stats);
      d_total_bit_errors = freedv_get_total_bit_errors(d_freedv);

      consume_each(in_offset);
      return out_offset;
    }

    void put_next_rx_proto(void *callback_state,char *proto_bits) {
      return;
    }

    void datarx(void *callback_state, unsigned char *packet, size_t size) {
      return;
    }

    void datatx(void *callback_state, unsigned char *packet, size_t *size) {
      return;
    }

    void freedv_rx_ss_impl::set_squelch_thresh(float squelch_thresh)
    {
      gr::thread::scoped_lock l(d_setlock);
      d_squelch_thresh = squelch_thresh;
      freedv_set_snr_squelch_thresh(d_freedv, d_squelch_thresh);
    }

    void freedv_rx_ss_impl::set_squelch_en(bool squelch_enabled)
    {
      gr::thread::scoped_lock l(d_setlock);
      d_squelch_en = squelch_enabled;
      if (squelch_enabled)
	freedv_set_squelch_en(d_freedv, 1);
      else
	freedv_set_squelch_en(d_freedv, 0);
    }

    float freedv_rx_ss_impl::squelch_thresh() {
      return(d_squelch_thresh);
    }

  } /* namespace vocoder */
} /* namespace gr */