gr-osmosdr/lib/file/file_source_c.cc

/* -*- c++ -*- */
/*
 * Copyright 2012 Dimitri Stolnikov <horiz0n@gmx.net>
 *
 * 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.
 */

#include <fstream>
#include <string>
#include <sstream>

#include <boost/assign.hpp>
#include <boost/format.hpp>

#include <gnuradio/io_signature.h>

#include "file_source_c.h"

#include "arg_helpers.h"

using namespace boost::assign;

file_source_c_sptr make_file_source_c(const std::string &args)
{
  return gnuradio::get_initial_sptr(new file_source_c(args));
}

file_source_c::file_source_c(const std::string &args) :
  gr::hier_block2("file_source_c",
                 gr::io_signature::make(0, 0, 0),
                 gr::io_signature::make(1, 1, sizeof (gr_complex)))
{
  std::string filename;
  bool repeat = true;
  bool throttle = true;
  _freq = 0;
  _rate = 0;

  dict_t dict = params_to_dict(args);

  if (dict.count("file"))
    filename = dict["file"];

  if (dict.count("freq"))
    _freq = boost::lexical_cast< double >( dict["freq"] );

  if (dict.count("rate"))
    _rate = boost::lexical_cast< double >( dict["rate"] );

  if (dict.count("repeat"))
    repeat = ("true" == dict["repeat"] ? true : false);

  if (dict.count("throttle"))
    throttle = ("true" == dict["throttle"] ? true : false);

  if (!filename.length())
    throw std::runtime_error("No file name specified.");

  if (_freq < 0)
    throw std::runtime_error("Parameter 'freq' may not be negative.");

  if (0 == _rate && throttle)
    throw std::runtime_error("Parameter 'rate' is missing in arguments.");

  _file_rate = _rate;

  _source = gr::blocks::file_source::make( sizeof(gr_complex),
                                           filename.c_str(),
                                           repeat );

  _throttle = gr::blocks::throttle::make( sizeof(gr_complex), _file_rate );

  if (throttle) {
    connect( _source, 0, _throttle, 0 );
    connect( _throttle, 0, self(), 0 );
  } else {
    connect( _source, 0, self(), 0 );
  }
}

file_source_c::~file_source_c()
{
}

std::string file_source_c::name()
{
  return "IQ File Source";
}

std::vector<std::string> file_source_c::get_devices( bool fake )
{
  std::vector<std::string> devices;

  if ( fake )
  {
    std::string args = "file='/path/to/your/file'";
    args += ",rate=1e6,freq=100e6,repeat=true,throttle=true";
    args += ",label='Complex Sampled (IQ) File'";
    devices.push_back( args );
  }

  return devices;
}

size_t file_source_c::get_num_channels( void )
{
  return 1;
}

bool file_source_c::seek( long seek_point, int whence , size_t chan )
{
    return _source->seek( seek_point, whence );
}

osmosdr::meta_range_t file_source_c::get_sample_rates( void )
{
  osmosdr::meta_range_t range;

  range += osmosdr::range_t( _file_rate ); /* always return file's original rate */

  return range;
}

double file_source_c::set_sample_rate( double rate )
{
  if ( _file_rate != rate )
  {
    std::cerr << boost::format("WARNING: Overriding original sample rate of %g with %g")
                 % _file_rate % rate
              << std::endl;
  }

  _throttle->set_sample_rate( rate );

  _rate = rate;

  return get_sample_rate();
}

double file_source_c::get_sample_rate( void )
{
  return _rate;
}

osmosdr::freq_range_t file_source_c::get_freq_range( size_t chan )
{
  return osmosdr::freq_range_t(_freq, _freq);
}

double file_source_c::set_center_freq( double freq, size_t chan )
{
  return get_center_freq(chan);
}

double file_source_c::get_center_freq( size_t chan )
{
  return _freq;
}

double file_source_c::set_freq_corr( double ppm, size_t chan )
{
  return get_freq_corr( chan );
}

double file_source_c::get_freq_corr( size_t chan )
{
  return 0;
}

std::vector<std::string> file_source_c::get_gain_names( size_t chan )
{
  return std::vector< std::string >();
}

osmosdr::gain_range_t file_source_c::get_gain_range( size_t chan )
{
  return osmosdr::gain_range_t();
}

osmosdr::gain_range_t file_source_c::get_gain_range( const std::string & name, size_t chan )
{
  return get_gain_range( chan );
}

double file_source_c::set_gain( double gain, size_t chan )
{
  return get_gain(chan);
}

double file_source_c::set_gain( double gain, const std::string & name, size_t chan )
{
  return set_gain(chan);
}

double file_source_c::get_gain( size_t chan )
{
  return 0;
}

double file_source_c::get_gain( const std::string & name, size_t chan )
{
  return get_gain(chan);
}

std::vector< std::string > file_source_c::get_antennas( size_t chan )
{
  return std::vector< std::string >();
}

std::string file_source_c::set_antenna( const std::string & antenna, size_t chan )
{
  return get_antenna(chan);
}

std::string file_source_c::get_antenna( size_t chan )
{
  return "";
}