GNU Radio 3.6.5.1 C++ API
gr_message_source.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2005 Free Software Foundation, Inc.
4  *
5  * This file is part of GNU Radio
6  *
7  * GNU Radio is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 3, or (at your option)
10  * any later version.
11  *
12  * GNU Radio is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with GNU Radio; see the file COPYING. If not, write to
19  * the Free Software Foundation, Inc., 51 Franklin Street,
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21  */
22 
23 #ifndef INCLUDED_GR_MESSAGE_SOURCE_H
24 #define INCLUDED_GR_MESSAGE_SOURCE_H
25 
26 #include <gr_core_api.h>
27 #include <gr_sync_block.h>
28 #include <gr_message.h>
29 #include <gr_msg_queue.h>
30 
31 class gr_message_source;
33 
37  const std::string& lengthtagname);
38 
39 /*!
40  * \brief Turn received messages into a stream
41  * \ingroup source_blk
42  */
44 {
45  private:
46  size_t d_itemsize;
47  gr_msg_queue_sptr d_msgq;
48  gr_message_sptr d_msg;
49  unsigned d_msg_offset;
50  bool d_eof;
51  bool d_tags;
52  // FIXME: Is this adequate tagname length.
53  std::string d_lengthtagname;
54 
56  gr_make_message_source(size_t itemsize, int msgq_limit);
58  gr_make_message_source(size_t itemsize, gr_msg_queue_sptr msgq);
60  gr_make_message_source(size_t itemsize, gr_msg_queue_sptr msgq, const std::string& lengthtagname);
61 
62  protected:
63  gr_message_source (size_t itemsize, int msgq_limit);
64  gr_message_source (size_t itemsize, gr_msg_queue_sptr msgq);
65  gr_message_source (size_t itemsize, gr_msg_queue_sptr msgq, const std::string& lengthtagname);
66 
67  public:
69 
70  gr_msg_queue_sptr msgq() const { return d_msgq; }
71 
72  int work (int noutput_items,
73  gr_vector_const_void_star &input_items,
74  gr_vector_void_star &output_items);
75 };
76 
77 #endif /* INCLUDED_GR_MESSAGE_SOURCE_H */