From 743cac795eef3cce95c87270670f383339bdbef9 Mon Sep 17 00:00:00 2001 From: Alexandru Csete Date: Sun, 8 Dec 2019 16:07:28 +0100 Subject: [PATCH] airspyhf: Add initial support for Airspy HF+ Info: http://airspy.com/airspy-hf-plus/ From: Alexandru Csete Signed-off-by: Sylvain Munaut --- CMakeLists.txt | 1 + cmake/Modules/FindLibAIRSPYHF.cmake | 24 ++ lib/CMakeLists.txt | 8 + lib/airspyhf/CMakeLists.txt | 37 +++ lib/airspyhf/airspyhf_source_c.cc | 438 ++++++++++++++++++++++++++++ lib/airspyhf/airspyhf_source_c.h | 117 ++++++++ lib/config.h.in | 1 + lib/device.cc | 8 + lib/source_impl.cc | 18 ++ 9 files changed, 652 insertions(+) create mode 100644 cmake/Modules/FindLibAIRSPYHF.cmake create mode 100644 lib/airspyhf/CMakeLists.txt create mode 100644 lib/airspyhf/airspyhf_source_c.cc create mode 100644 lib/airspyhf/airspyhf_source_c.h diff --git a/CMakeLists.txt b/CMakeLists.txt index c99a7f5..a9fd553 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -174,6 +174,7 @@ if(ENABLE_NONFREE) endif(ENABLE_NONFREE) find_package(LibHackRF) find_package(LibAIRSPY) +find_package(LibAIRSPYHF) find_package(LibbladeRF) find_package(SoapySDR NO_MODULE) find_package(LibFreeSRP) diff --git a/cmake/Modules/FindLibAIRSPYHF.cmake b/cmake/Modules/FindLibAIRSPYHF.cmake new file mode 100644 index 0000000..edb0dda --- /dev/null +++ b/cmake/Modules/FindLibAIRSPYHF.cmake @@ -0,0 +1,24 @@ +INCLUDE(FindPkgConfig) +PKG_CHECK_MODULES(PC_LIBAIRSPYHF libairspyhf) + +FIND_PATH( + LIBAIRSPYHF_INCLUDE_DIRS + NAMES libairspyhf/airspyhf.h + HINTS $ENV{LIBAIRSPYHF_DIR}/include + ${PC_LIBAIRSPYHF_INCLUDEDIR} + PATHS /usr/local/include + /usr/include +) + +FIND_LIBRARY( + LIBAIRSPYHF_LIBRARIES + NAMES airspyhf + HINTS $ENV{LIBAIRSPYHF_DIR}/lib + ${PC_LIBAIRSPYHF_LIBDIR} + PATHS /usr/local/lib + /usr/lib +) + +INCLUDE(FindPackageHandleStandardArgs) +FIND_PACKAGE_HANDLE_STANDARD_ARGS(LIBAIRSPYHF DEFAULT_MSG LIBAIRSPYHF_LIBRARIES LIBAIRSPYHF_INCLUDE_DIRS) +MARK_AS_ADVANCED(LIBAIRSPYHF_LIBRARIES LIBAIRSPYHF_INCLUDE_DIRS) diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt index a5ea712..d04cb1d 100644 --- a/lib/CMakeLists.txt +++ b/lib/CMakeLists.txt @@ -217,6 +217,14 @@ if(ENABLE_AIRSPY) add_subdirectory(airspy) endif(ENABLE_AIRSPY) +######################################################################## +# Setup AIRSPYHF component +######################################################################## +GR_REGISTER_COMPONENT("AIRSPY HF+ Receiver" ENABLE_AIRSPYHF LIBAIRSPYHF_FOUND) +if(ENABLE_AIRSPYHF) + add_subdirectory(airspyhf) +endif(ENABLE_AIRSPYHF) + ######################################################################## # Setup SoapySDR component ######################################################################## diff --git a/lib/airspyhf/CMakeLists.txt b/lib/airspyhf/CMakeLists.txt new file mode 100644 index 0000000..122a67c --- /dev/null +++ b/lib/airspyhf/CMakeLists.txt @@ -0,0 +1,37 @@ +# Copyright 2017 Free Software Foundation, Inc. +# +# This file is part of gr-osmosdr +# +# gr-osmosdr 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. +# +# gr-osmosdr 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 gr-osmosdr; see the file COPYING. If not, write to +# the Free Software Foundation, Inc., 51 Franklin Street, +# Boston, MA 02110-1301, USA. + +######################################################################## +# This file included, use CMake directory variables +######################################################################## + +target_include_directories(gnuradio-osmosdr PRIVATE + ${CMAKE_CURRENT_SOURCE_DIR} + ${LIBAIRSPYHF_INCLUDE_DIRS} +) + +target_link_libraries(gnuradio-osmosdr + ${Gnuradio-blocks_LIBRARIES} + ${LIBAIRSPYHF_LIBRARIES} +) + +list(APPEND gr_osmosdr_srcs + ${CMAKE_CURRENT_SOURCE_DIR}/airspyhf_source_c.cc +) +set(gr_osmosdr_srcs ${gr_osmosdr_srcs} PARENT_SCOPE) diff --git a/lib/airspyhf/airspyhf_source_c.cc b/lib/airspyhf/airspyhf_source_c.cc new file mode 100644 index 0000000..327fe19 --- /dev/null +++ b/lib/airspyhf/airspyhf_source_c.cc @@ -0,0 +1,438 @@ +/* -*- c++ -*- */ +/* + * Copyright 2013 Dimitri Stolnikov + * + * 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. + */ + +/* + * config.h is generated by configure. It contains the results + * of probing for features, options etc. It should be the first + * file included in your .cc file. + */ +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include +#include +#include + +#include +#include +#include +#include +#include + +#include + +#include "airspyhf_source_c.h" +#include "arg_helpers.h" + +using namespace boost::assign; + +#define AIRSPYHF_FORMAT_ERROR(ret, msg) \ + boost::str( boost::format(msg " (%1%)") % ret ) + +#define AIRSPYHF_THROW_ON_ERROR(ret, msg) \ + if ( ret != AIRSPYHF_SUCCESS ) \ + { \ + throw std::runtime_error( AIRSPYHF_FORMAT_ERROR(ret, msg) ); \ + } + +#define AIRSPYHF_FUNC_STR(func, arg) \ + boost::str(boost::format(func "(%1%)") % arg) + " has failed" + +airspyhf_source_c_sptr make_airspyhf_source_c (const std::string & args) +{ + return gnuradio::get_initial_sptr(new airspyhf_source_c (args)); +} + +/* + * Specify constraints on number of input and output streams. + * This info is used to construct the input and output signatures + * (2nd & 3rd args to gr::block's constructor). The input and + * output signatures are used by the runtime system to + * check that a valid number and type of inputs and outputs + * are connected to this block. In this case, we accept + * only 0 input and 1 output. + */ +static const int MIN_IN = 0; // mininum number of input streams +static const int MAX_IN = 0; // maximum number of input streams +static const int MIN_OUT = 1; // minimum number of output streams +static const int MAX_OUT = 1; // maximum number of output streams + +/* + * The private constructor + */ +airspyhf_source_c::airspyhf_source_c (const std::string &args) + : gr::sync_block ("airspyhf_source_c", + gr::io_signature::make(MIN_IN, MAX_IN, sizeof (gr_complex)), + gr::io_signature::make(MIN_OUT, MAX_OUT, sizeof (gr_complex))), + _dev(NULL), + _sample_rate(0), + _center_freq(0), + _freq_corr(0) +{ + int ret; + + dict_t dict = params_to_dict(args); + + _dev = NULL; + ret = airspyhf_open( &_dev ); + AIRSPYHF_THROW_ON_ERROR(ret, "Failed to open Airspy HF+ device") + + uint32_t num_rates; + airspyhf_get_samplerates(_dev, &num_rates, 0); + uint32_t *samplerates = (uint32_t *) malloc(num_rates * sizeof(uint32_t)); + airspyhf_get_samplerates(_dev, samplerates, num_rates); + for (size_t i = 0; i < num_rates; i++) + _sample_rates.push_back( std::pair( samplerates[i], i ) ); + free(samplerates); + + /* since they may (and will) give us an unsorted array we have to sort it here + * to play nice with the monotonic requirement of meta-range later on */ + std::sort(_sample_rates.begin(), _sample_rates.end()); + + std::cerr << "Using libairspyhf" << AIRSPYHF_VERSION << ", samplerates: "; + + for (size_t i = 0; i < _sample_rates.size(); i++) + std::cerr << boost::format("%gM ") % (_sample_rates[i].first / 1e6); + + std::cerr << std::endl; + + set_center_freq( (get_freq_range().start() + get_freq_range().stop()) / 2.0 ); + set_sample_rate( get_sample_rates().start() ); + + _fifo = new boost::circular_buffer(5000000); + if (!_fifo) { + throw std::runtime_error( std::string(__FUNCTION__) + " " + + "Failed to allocate a sample FIFO!" ); + } +} + +/* + * Our virtual destructor. + */ +airspyhf_source_c::~airspyhf_source_c () +{ + int ret; + + if (_dev) { + if ( airspyhf_is_streaming( _dev ) ) + { + ret = airspyhf_stop( _dev ); + if ( ret != AIRSPYHF_SUCCESS ) + { + std::cerr << AIRSPYHF_FORMAT_ERROR(ret, "Failed to stop RX streaming") << std::endl; + } + } + + ret = airspyhf_close( _dev ); + if ( ret != AIRSPYHF_SUCCESS ) + { + std::cerr << AIRSPYHF_FORMAT_ERROR(ret, "Failed to close AirSpy") << std::endl; + } + _dev = NULL; + } + + if (_fifo) + { + delete _fifo; + _fifo = NULL; + } +} + +int airspyhf_source_c::_airspyhf_rx_callback(airspyhf_transfer_t *transfer) +{ + airspyhf_source_c *obj = (airspyhf_source_c *)transfer->ctx; + + return obj->airspyhf_rx_callback((float *)transfer->samples, transfer->sample_count); +} + +int airspyhf_source_c::airspyhf_rx_callback(void *samples, int sample_count) +{ + size_t i, n_avail, to_copy, num_samples = sample_count; + float *sample = (float *)samples; + + _fifo_lock.lock(); + + n_avail = _fifo->capacity() - _fifo->size(); + to_copy = (n_avail < num_samples ? n_avail : num_samples); + + for (i = 0; i < to_copy; i++ ) + { + /* Push sample to the fifo */ + _fifo->push_back( gr_complex( *sample, *(sample+1) ) ); + + /* offset to the next I+Q sample */ + sample += 2; + } + + _fifo_lock.unlock(); + + /* We have made some new samples available to the consumer in work() */ + if (to_copy) { + //std::cerr << "+" << std::flush; + _samp_avail.notify_one(); + } + + /* Indicate overrun, if neccesary */ + if (to_copy < num_samples) + std::cerr << "O" << std::flush; + + return 0; // TODO: return -1 on error/stop +} + +bool airspyhf_source_c::start() +{ + if ( ! _dev ) + return false; + + int ret = airspyhf_start( _dev, _airspyhf_rx_callback, (void *)this ); + if ( ret != AIRSPYHF_SUCCESS ) { + std::cerr << "Failed to start RX streaming (" << ret << ")" << std::endl; + return false; + } + + return true; +} + +bool airspyhf_source_c::stop() +{ + if ( ! _dev ) + return false; + + int ret = airspyhf_stop( _dev ); + if ( ret != AIRSPYHF_SUCCESS ) { + std::cerr << "Failed to stop RX streaming (" << ret << ")" << std::endl; + return false; + } + + return true; +} + +int airspyhf_source_c::work( int noutput_items, + gr_vector_const_void_star &input_items, + gr_vector_void_star &output_items ) +{ + gr_complex *out = (gr_complex *)output_items[0]; + + bool running = false; + + if ( _dev ) + running = airspyhf_is_streaming( _dev ); + + if ( ! running ) + return WORK_DONE; + + boost::unique_lock lock(_fifo_lock); + + /* Wait until we have the requested number of samples */ + int n_samples_avail = _fifo->size(); + + while (n_samples_avail < noutput_items) { + _samp_avail.wait(lock); + n_samples_avail = _fifo->size(); + } + + for(int i = 0; i < noutput_items; ++i) { + out[i] = _fifo->at(0); + _fifo->pop_front(); + } + + return noutput_items; +} + +std::vector airspyhf_source_c::get_devices() +{ + std::vector devices; + std::string label; + + int ret; + airspyhf_device *dev = NULL; + ret = airspyhf_open(&dev); + if ( AIRSPYHF_SUCCESS == ret ) + { + std::string args = "airspyhf=0,label='AirspyHF'"; + devices.push_back( args ); + ret = airspyhf_close(dev); + } + + return devices; +} + +size_t airspyhf_source_c::get_num_channels() +{ + return 1; +} + +osmosdr::meta_range_t airspyhf_source_c::get_sample_rates() +{ + osmosdr::meta_range_t range; + + for (size_t i = 0; i < _sample_rates.size(); i++) + range += osmosdr::range_t( _sample_rates[i].first ); + + return range; +} + +double airspyhf_source_c::set_sample_rate( double rate ) +{ + int ret = AIRSPYHF_SUCCESS; + + if (_dev) { + bool found_supported_rate = false; + uint32_t samp_rate_index = 0; + + for( unsigned int i = 0; i < _sample_rates.size(); i++ ) + { + if( _sample_rates[i].first == rate ) + { + samp_rate_index = _sample_rates[i].second; + + found_supported_rate = true; + } + } + + if ( ! found_supported_rate ) + { + throw std::runtime_error( + boost::str( boost::format("Unsupported samplerate: %gM") % (rate/1e6) ) ); + } + + ret = airspyhf_set_samplerate( _dev, samp_rate_index ); + if ( AIRSPYHF_SUCCESS == ret ) { + _sample_rate = rate; + } else { + AIRSPYHF_THROW_ON_ERROR( ret, AIRSPYHF_FUNC_STR( "airspyhf_set_samplerate", rate ) ) + } + } + + return get_sample_rate(); +} + +double airspyhf_source_c::get_sample_rate() +{ + return _sample_rate; +} + +osmosdr::freq_range_t airspyhf_source_c::get_freq_range( size_t chan ) +{ + osmosdr::freq_range_t range; + + range += osmosdr::range_t( 0.0, 260.0e6 ); + + return range; +} + +double airspyhf_source_c::set_center_freq( double freq, size_t chan ) +{ + int ret; + + if (_dev) { + ret = airspyhf_set_freq( _dev, freq ); + if ( AIRSPYHF_SUCCESS == ret ) { + _center_freq = freq; + } else { + AIRSPYHF_THROW_ON_ERROR( ret, AIRSPYHF_FUNC_STR( "airspyhf_set_freq", freq ) ) + } + } + + return get_center_freq( chan ); +} + +double airspyhf_source_c::get_center_freq( size_t chan ) +{ + return _center_freq; +} + +double airspyhf_source_c::set_freq_corr( double ppm, size_t chan ) +{ + int ret; + int32_t ppb = (int32_t) (ppm * 1.0e3); + + if (_dev) { + ret = airspyhf_set_calibration( _dev, ppb ); + if ( AIRSPYHF_SUCCESS == ret ) { + _freq_corr = ppm; + } else { + AIRSPYHF_THROW_ON_ERROR( ret, AIRSPYHF_FUNC_STR( "airspyhf_set_calibration", ppm ) ) + } + } + + return ppm; +} + +double airspyhf_source_c::get_freq_corr( size_t chan ) +{ + return _freq_corr; +} + +std::vector airspyhf_source_c::get_gain_names( size_t chan ) +{ + return {}; +} + +osmosdr::gain_range_t airspyhf_source_c::get_gain_range( size_t chan ) +{ + return osmosdr::gain_range_t(); +} + +osmosdr::gain_range_t airspyhf_source_c::get_gain_range( const std::string & name, size_t chan ) +{ + return osmosdr::gain_range_t(); +} + + +double airspyhf_source_c::set_gain( double gain, size_t chan ) +{ + return gain; +} + +double airspyhf_source_c::set_gain( double gain, const std::string & name, size_t chan) +{ + return gain; +} + +double airspyhf_source_c::get_gain( size_t chan ) +{ + return 0.0; +} + +double airspyhf_source_c::get_gain( const std::string & name, size_t chan ) +{ + return 0.0; +} + +std::vector< std::string > airspyhf_source_c::get_antennas( size_t chan ) +{ + std::vector< std::string > antennas; + + antennas += get_antenna( chan ); + + return antennas; +} + +std::string airspyhf_source_c::set_antenna( const std::string & antenna, size_t chan ) +{ + return get_antenna( chan ); +} + +std::string airspyhf_source_c::get_antenna( size_t chan ) +{ + return "RX"; +} diff --git a/lib/airspyhf/airspyhf_source_c.h b/lib/airspyhf/airspyhf_source_c.h new file mode 100644 index 0000000..cfb8c89 --- /dev/null +++ b/lib/airspyhf/airspyhf_source_c.h @@ -0,0 +1,117 @@ +/* -*- c++ -*- */ +/* + * Copyright 2013 Dimitri Stolnikov + * + * 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. + */ +#ifndef INCLUDED_AIRSPYHF_SOURCE_C_H +#define INCLUDED_AIRSPYHF_SOURCE_C_H + +#include +#include +#include + +#include + +#include + +#include "source_iface.h" + +class airspyhf_source_c; + +typedef boost::shared_ptr airspyhf_source_c_sptr; + +/*! + * \brief Return a shared_ptr to a new instance of airspyhf_source_c. + * + * To avoid accidental use of raw pointers, airspyhf_source_c's + * constructor is private. make_airspyhf_source_c is the public + * interface for creating new instances. + */ +airspyhf_source_c_sptr make_airspyhf_source_c (const std::string & args = ""); + +/*! + * \brief Provides a stream of complex samples. + * \ingroup block + */ +class airspyhf_source_c : + public gr::sync_block, + public source_iface +{ +private: + // The friend declaration allows make_airspyhf_source_c to + // access the private constructor. + + friend airspyhf_source_c_sptr make_airspyhf_source_c (const std::string & args); + + airspyhf_source_c (const std::string & args); + +public: + ~airspyhf_source_c (); + + bool start(); + bool stop(); + + int work( int noutput_items, + gr_vector_const_void_star &input_items, + gr_vector_void_star &output_items ); + + static std::vector< std::string > get_devices(); + + size_t get_num_channels( void ); + + osmosdr::meta_range_t get_sample_rates( void ); + double set_sample_rate( double rate ); + double get_sample_rate( void ); + + osmosdr::freq_range_t get_freq_range( size_t chan = 0 ); + double set_center_freq( double freq, size_t chan = 0 ); + double get_center_freq( size_t chan = 0 ); + double set_freq_corr( double ppm, size_t chan = 0 ); + double get_freq_corr( size_t chan = 0 ); + + std::vector get_gain_names( size_t chan = 0 ); + osmosdr::gain_range_t get_gain_range( size_t chan = 0 ); + osmosdr::gain_range_t get_gain_range( const std::string & name, size_t chan = 0 ); + double set_gain( double gain, size_t chan = 0 ); + double set_gain( double gain, const std::string & name, size_t chan = 0 ); + double get_gain( size_t chan = 0 ); + double get_gain( const std::string & name, size_t chan = 0 ); + + std::vector< std::string > get_antennas( size_t chan = 0 ); + std::string set_antenna( const std::string & antenna, size_t chan = 0 ); + std::string get_antenna( size_t chan = 0 ); + + +private: + static int _airspyhf_rx_callback(airspyhf_transfer_t* transfer); + int airspyhf_rx_callback(void *samples, int sample_count); + + airspyhf_device *_dev; + + boost::circular_buffer *_fifo; + boost::mutex _fifo_lock; + boost::condition_variable _samp_avail; + + std::vector< std::pair > _sample_rates; + double _sample_rate; + double _center_freq; + double _freq_corr; +}; + +#endif /* INCLUDED_AIRSPY_SOURCE_C_H */ diff --git a/lib/config.h.in b/lib/config.h.in index 42e72f1..5303d7d 100644 --- a/lib/config.h.in +++ b/lib/config.h.in @@ -16,6 +16,7 @@ #cmakedefine ENABLE_BLADERF #cmakedefine ENABLE_RFSPACE #cmakedefine ENABLE_AIRSPY +#cmakedefine ENABLE_AIRSPYHF #cmakedefine ENABLE_SOAPY #cmakedefine ENABLE_REDPITAYA #cmakedefine ENABLE_FREESRP diff --git a/lib/device.cc b/lib/device.cc index 025a22b..586062f 100644 --- a/lib/device.cc +++ b/lib/device.cc @@ -78,6 +78,10 @@ #include #endif +#ifdef ENABLE_AIRSPYHF +#include +#endif + #ifdef ENABLE_SOAPY #include #endif @@ -186,6 +190,10 @@ devices_t device::find(const device_t &hint) BOOST_FOREACH( std::string dev, airspy_source_c::get_devices() ) devices.push_back( device_t(dev) ); #endif +#ifdef ENABLE_AIRSPYHF + BOOST_FOREACH( std::string dev, airspyhf_source_c::get_devices() ) + devices.push_back( device_t(dev) ); +#endif #ifdef ENABLE_FREESRP BOOST_FOREACH( std::string dev, freesrp_source_c::get_devices() ) devices.push_back( device_t(dev) ); diff --git a/lib/source_impl.cc b/lib/source_impl.cc index a8a3cec..af2e3c2 100644 --- a/lib/source_impl.cc +++ b/lib/source_impl.cc @@ -80,6 +80,10 @@ #include #endif +#ifdef ENABLE_AIRSPYHF +#include +#endif + #ifdef ENABLE_SOAPY #include #endif @@ -157,6 +161,9 @@ source_impl::source_impl( const std::string &args ) #ifdef ENABLE_AIRSPY dev_types.push_back("airspy"); #endif +#ifdef ENABLE_AIRSPYHF + dev_types.push_back("airspyhf"); +#endif #ifdef ENABLE_SOAPY dev_types.push_back("soapy"); #endif @@ -233,6 +240,10 @@ source_impl::source_impl( const std::string &args ) BOOST_FOREACH( std::string dev, airspy_source_c::get_devices() ) dev_list.push_back( dev ); #endif +#ifdef ENABLE_AIRSPYHF + BOOST_FOREACH( std::string dev, airspyhf_source_c::get_devices() ) + dev_list.push_back( dev ); +#endif #ifdef ENABLE_SOAPY BOOST_FOREACH( std::string dev, soapy_source_c::get_devices() ) dev_list.push_back( dev ); @@ -355,6 +366,13 @@ source_impl::source_impl( const std::string &args ) } #endif +#ifdef ENABLE_AIRSPYHF + if ( dict.count("airspyhf") ) { + airspyhf_source_c_sptr src = make_airspyhf_source_c( arg ); + block = src; iface = src.get(); + } +#endif + #ifdef ENABLE_SOAPY if ( dict.count("soapy") ) { soapy_source_c_sptr src = make_soapy_source_c( arg );