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diff --git a/lib/xtrx/xtrx_sink_c.h b/lib/xtrx/xtrx_sink_c.h
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+++ b/lib/xtrx/xtrx_sink_c.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2016 Sergey Kostanabev <sergey.kostanbaev@fairwaves.co>
+ *
+ * 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 XTRX_SINK_C_H
+#define XTRX_SINK_C_H
+
+#include <gnuradio/block.h>
+#include <gnuradio/sync_block.h>
+
+#include "sink_iface.h"
+#include "xtrx_obj.h"
+
+
+static const pmt::pmt_t SOB_KEY = pmt::string_to_symbol("tx_sob");
+static const pmt::pmt_t EOB_KEY = pmt::string_to_symbol("tx_eob");
+static const pmt::pmt_t TIME_KEY = pmt::string_to_symbol("tx_time");
+static const pmt::pmt_t FREQ_KEY = pmt::string_to_symbol("tx_freq");
+static const pmt::pmt_t COMMAND_KEY = pmt::string_to_symbol("tx_command");
+
+class xtrx_sink_c;
+
+typedef boost::shared_ptr< xtrx_sink_c > xtrx_sink_c_sptr;
+
+xtrx_sink_c_sptr make_xtrx_sink_c( const std::string & args = "" );
+
+class xtrx_sink_c :
+    public gr::sync_block,
+    public sink_iface
+{
+private:
+  friend xtrx_sink_c_sptr make_xtrx_sink_c(const std::string &args);
+
+  xtrx_sink_c(const std::string &args);
+
+public:
+  ~xtrx_sink_c();
+
+  std::string name();
+
+  static std::vector< std::string > get_devices( bool fake = false ) { return xtrx_obj::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<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 );
+  bool set_gain_mode( bool automatic, size_t chan = 0 );
+  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 );
+
+  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 );
+
+  int work (int noutput_items,
+            gr_vector_const_void_star &input_items,
+            gr_vector_void_star &output_items);
+
+  bool start();
+  bool stop();
+
+  void tag_process(int ninput_items);
+
+private:
+  xtrx_obj_sptr _xtrx;
+  std::vector<gr::tag_t> _tags;
+
+  unsigned _sample_flags;
+  double _rate;
+  double _master;
+  double _freq;
+  double _corr;
+  double _bandwidth;
+  double _dsp;
+  bool _auto_gain;
+
+  xtrx_wire_format_t _otw;
+  bool _mimo_mode;
+
+  int _gain_tx;
+
+  unsigned _channels;
+  xtrx_antenna_t _ant;
+
+  uint64_t _ts;
+
+  bool     _swap_ab;
+  bool     _swap_iq;
+
+  bool     _tdd;
+  bool     _allow_dis;
+
+  std::string _dev;
+};
+
+#endif // xtrx_sink_c_H