GNU Radio 3.6.1 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,
20  * Boston, MA 02110-1301, USA.
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 
34 GR_CORE_API gr_message_source_sptr gr_make_message_source (size_t itemsize, int msgq_limit=0);
36 
37 /*!
38  * \brief Turn received messages into a stream
39  * \ingroup source_blk
40  */
42 {
43  private:
44  size_t d_itemsize;
45  gr_msg_queue_sptr d_msgq;
46  gr_message_sptr d_msg;
47  unsigned d_msg_offset;
48  bool d_eof;
49 
51  gr_make_message_source(size_t itemsize, int msgq_limit);
53  gr_make_message_source(size_t itemsize, gr_msg_queue_sptr msgq);
54 
55  protected:
56  gr_message_source (size_t itemsize, int msgq_limit);
57  gr_message_source (size_t itemsize, gr_msg_queue_sptr msgq);
58 
59  public:
61 
62  gr_msg_queue_sptr msgq() const { return d_msgq; }
63 
64  int work (int noutput_items,
65  gr_vector_const_void_star &input_items,
66  gr_vector_void_star &output_items);
67 };
68 
69 #endif /* INCLUDED_GR_MESSAGE_SOURCE_H */