GNU Radio 3.4.0 C++ API
atsc_field_sync_mux.h
Go to the documentation of this file.
00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2006 Free Software Foundation, Inc.
00004  * 
00005  * This file is part of GNU Radio
00006  * 
00007  * GNU Radio is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 3, or (at your option)
00010  * any later version.
00011  * 
00012  * GNU Radio is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  * 
00017  * You should have received a copy of the GNU General Public License
00018  * along with GNU Radio; see the file COPYING.  If not, write to
00019  * the Free Software Foundation, Inc., 51 Franklin Street,
00020  * Boston, MA 02110-1301, USA.
00021  */
00022 #ifndef INCLUDED_ATSC_FIELD_SYNC_MUX_H
00023 #define INCLUDED_ATSC_FIELD_SYNC_MUX_H
00024 
00025 #include <gr_sync_block.h>
00026 #include <atsc_types.h>
00027 
00028 class atsc_field_sync_mux;
00029 typedef boost::shared_ptr<atsc_field_sync_mux> atsc_field_sync_mux_sptr;
00030 
00031 atsc_field_sync_mux_sptr atsc_make_field_sync_mux();
00032 
00033 /*!
00034  * \brief Insert ATSC Field Syncs as required (atsc_data_segment --> atsc_data_segment)
00035  * \ingroup atsc
00036  *
00037  * input: atsc_data_segment; output: atsc_data_segment
00038  */
00039 class atsc_field_sync_mux : public gr_sync_block
00040 {
00041   friend atsc_field_sync_mux_sptr atsc_make_field_sync_mux();
00042 
00043   atsc_field_sync_mux();
00044 
00045 public:
00046   void forecast (int noutput_items, gr_vector_int &ninput_items_required);
00047   int work (int noutput_items,
00048             gr_vector_const_void_star &input_items,
00049             gr_vector_void_star &output_items);
00050 
00051 
00052   static const int      N_SAVED_SYMBOLS = 12;
00053 
00054   void reset() { /* nop */ }
00055 
00056 protected:
00057   gr_uint64             d_current_index;
00058   bool                  d_already_output_field_sync;
00059   unsigned char         d_saved_symbols[N_SAVED_SYMBOLS];
00060 };
00061 
00062 
00063 #endif /* INCLUDED_ATSC_FIELD_SYNC_MUX_H */