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diff --git a/lib/soapy/soapy_sink_c.h b/lib/soapy/soapy_sink_c.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2015 Josh Blum <josh@joshknows.com>
+ * Copyright 2013 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.
+ */
+#ifndef INCLUDED_SOAPY_SINK_C_H
+#define INCLUDED_SOAPY_SINK_C_H
+
+#include <gnuradio/block.h>
+#include <gnuradio/sync_block.h>
+
+#include "osmosdr/ranges.h"
+#include "sink_iface.h"
+
+class soapy_sink_c;
+
+/*
+ * We use boost::shared_ptr's instead of raw pointers for all access
+ * to gr_blocks (and many other data structures).  The shared_ptr gets
+ * us transparent reference counting, which greatly simplifies storage
+ * management issues.  This is especially helpful in our hybrid
+ * C++ / Python system.
+ *
+ * See http://www.boost.org/libs/smart_ptr/smart_ptr.htm
+ *
+ * As a convention, the _sptr suffix indicates a boost::shared_ptr
+ */
+typedef boost::shared_ptr<soapy_sink_c> soapy_sink_c_sptr;
+
+/*!
+ * \brief Return a shared_ptr to a new instance of soapy_sink_c.
+ *
+ * To avoid accidental use of raw pointers, soapy_sink_c's
+ * constructor is private.  make_soapy_sink_c is the public
+ * interface for creating new instances.
+ */
+soapy_sink_c_sptr make_soapy_sink_c (const std::string & args = "");
+
+class soapy_sink_c :
+    public gr::sync_block,
+    public sink_iface
+{
+private:
+  // The friend declaration allows soapy_make_sink_c to
+  // access the private constructor.
+  friend soapy_sink_c_sptr make_soapy_sink_c (const std::string & args);
+
+  soapy_sink_c (const std::string & args);  	// private constructor
+
+public:
+  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);
+double set_center_freq( double freq, size_t chan);
+double get_center_freq( size_t chan);
+double set_freq_corr( double ppm, size_t chan);
+double get_freq_corr( size_t chan);
+std::vector<std::string> get_gain_names( size_t chan);
+osmosdr::gain_range_t get_gain_range( size_t chan);
+osmosdr::gain_range_t get_gain_range( const std::string & name,
+                                                size_t chan);
+bool set_gain_mode( bool automatic, size_t chan);
+bool get_gain_mode( size_t chan);
+double set_gain( double gain, size_t chan);
+double set_gain( double gain,
+                           const std::string & name,
+                           size_t chan);
+double get_gain( size_t chan);
+double get_gain( const std::string & name, size_t chan);
+double set_if_gain( double gain, size_t chan);
+double set_bb_gain( double gain, size_t chan);
+std::vector< std::string > get_antennas( size_t chan);
+std::string set_antenna( const std::string & antenna,
+                                   size_t chan);
+std::string get_antenna( size_t chan);
+void set_dc_offset( const std::complex<double> &offset, size_t chan);
+void set_iq_balance( const std::complex<double> &balance, size_t chan);
+double set_bandwidth( double bandwidth, size_t chan);
+double get_bandwidth( size_t chan);
+osmosdr::freq_range_t get_bandwidth_range( size_t chan);
+void set_time_source(const std::string &source,
+                               const size_t mboard);
+std::string get_time_source(const size_t mboard);
+std::vector<std::string> get_time_sources(const size_t mboard);
+void set_clock_source(const std::string &source,
+                                const size_t mboard);
+std::string get_clock_source(const size_t mboard);
+std::vector<std::string> get_clock_sources(const size_t mboard);
+double get_clock_rate(size_t mboard);
+void set_clock_rate(double rate, size_t mboard);
+::osmosdr::time_spec_t get_time_now(size_t mboard);
+::osmosdr::time_spec_t get_time_last_pps(size_t mboard);
+void set_time_now(const ::osmosdr::time_spec_t &time_spec,
+                            size_t mboard);
+void set_time_next_pps(const ::osmosdr::time_spec_t &time_spec);
+void set_time_unknown_pps(const ::osmosdr::time_spec_t &time_spec);
+};
+
+#endif /* INCLUDED_SOAPY_SINK_C_H */