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diff --git a/lib/freesrp/freesrp_sink_c.h b/lib/freesrp/freesrp_sink_c.h
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+++ b/lib/freesrp/freesrp_sink_c.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2015 Lukas Lao Beyer
+ * 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_FREESRP_SINK_C_H
+#define INCLUDED_FREESRP_SINK_C_H
+
+#include <gnuradio/thread/thread.h>
+#include <gnuradio/block.h>
+#include <gnuradio/sync_block.h>
+
+#include "osmosdr/ranges.h"
+#include "sink_iface.h"
+
+#include "freesrp_common.h"
+#include "readerwriterqueue/readerwriterqueue.h"
+
+#include <mutex>
+#include <condition_variable>
+
+#include <freesrp.hpp>
+
+class freesrp_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<freesrp_sink_c> freesrp_sink_c_sptr;
+
+/*!
+ * \brief Return a shared_ptr to a new instance of freesrp_sink_c.
+ *
+ * To avoid accidental use of raw pointers, freesrp_sink_c's
+ * constructor is private.  make_freesrp_sink_c is the public
+ * interface for creating new instances.
+ */
+freesrp_sink_c_sptr make_freesrp_sink_c (const std::string & args = "");
+
+class freesrp_sink_c :
+    public gr::sync_block,
+    public sink_iface,
+    public freesrp_common
+{
+private:
+    // The friend declaration allows freesrp_make_sink_c to
+    // access the private constructor.
+    friend freesrp_sink_c_sptr make_freesrp_sink_c (const std::string & args);
+
+    freesrp_sink_c (const std::string & args);  	// private constructor
+
+public:
+
+    // From freesrp_common:
+    static std::vector<std::string> get_devices() { return freesrp_common::get_devices(); };
+    size_t get_num_channels( void ) { return freesrp_common::get_num_channels(); }
+    osmosdr::meta_range_t get_sample_rates( void ) { return freesrp_common::get_sample_rates(); }
+    osmosdr::freq_range_t get_freq_range( size_t chan = 0 ) { return freesrp_common::get_freq_range(chan); }
+    osmosdr::freq_range_t get_bandwidth_range( size_t chan = 0 ) { return freesrp_common::get_bandwidth_range(chan); }
+    double set_freq_corr( double ppm, size_t chan = 0 ) { return freesrp_common::set_freq_corr(ppm, chan); }
+    double get_freq_corr( size_t chan = 0 ) { return freesrp_common::get_freq_corr(chan); }
+
+    bool start();
+    bool stop();
+
+    int work( int noutput_items,
+              gr_vector_const_void_star &input_items,
+              gr_vector_void_star &output_items );
+
+    double set_sample_rate( double rate );
+    double get_sample_rate( void );
+
+    double set_center_freq( double freq, size_t chan = 0 );
+    double get_center_freq( size_t chan = 0 );
+
+    std::vector<std::string> 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 );
+    //TODO: implement this: bool set_gain_mode( bool automatic, size_t chan = 0 );
+    //TODO: implement this: bool get_gain_mode( 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 );
+
+    double set_bb_gain( double gain, 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 );
+
+    double set_bandwidth( double bandwidth, size_t chan = 0 );
+    double get_bandwidth( size_t chan = 0 );
+
+private:
+
+    void freesrp_tx_callback(std::vector<::FreeSRP::sample> &samples);
+
+    bool _running = false;
+
+    std::mutex _buf_mut{};
+    std::condition_variable _buf_cond{};
+    size_t _buf_available_space = FREESRP_RX_TX_QUEUE_SIZE;
+    moodycamel::ReaderWriterQueue<::FreeSRP::sample> _buf_queue{FREESRP_RX_TX_QUEUE_SIZE};
+};
+
+#endif /* INCLUDED_FREESRP_SINK_C_H */