GNU Radio 3.5.3.2 C++ API
gr_delay.h
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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2007,2012 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 
00023 #ifndef INCLUDED_GR_DELAY_H
00024 #define INCLUDED_GR_DELAY_H
00025 
00026 #include <gr_core_api.h>
00027 #include <gr_block.h>
00028 #include <gruel/thread.h>
00029 
00030 class gr_delay;
00031 typedef boost::shared_ptr<gr_delay> gr_delay_sptr;
00032 
00033 GR_CORE_API gr_delay_sptr gr_make_delay (size_t itemsize, int delay);
00034 
00035 /*!
00036  * \brief delay the input by a certain number of samples
00037  * \ingroup misc_blk
00038  */
00039 class GR_CORE_API gr_delay : public gr_block
00040 {
00041   friend GR_CORE_API gr_delay_sptr gr_make_delay (size_t itemsize, int delay);
00042 
00043   gr_delay (size_t itemsize, int delay);
00044 
00045   void forecast (int noutput_items, gr_vector_int &ninput_items_required);
00046 
00047   size_t d_itemsize;
00048   int d_delta;
00049   gruel::mutex d_mutex_delay;
00050 
00051  public:
00052   int delay () const { return history()-1; }
00053   void set_delay (int delay);
00054 
00055   int general_work (int noutput_items,
00056                     gr_vector_int &ninput_items,
00057                     gr_vector_const_void_star &input_items,
00058                     gr_vector_void_star &output_items);
00059 };
00060 
00061 #endif