GNU Radio 3.6.5.1 C++ API
wavfile_source_impl.h
Go to the documentation of this file.
1 /* -*- c++ -*- */
2 /*
3  * Copyright 2004,2008,2013 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_WAVFILE_SOURCE_IMPL_H
24 #define INCLUDED_GR_WAVFILE_SOURCE_IMPL_H
25 
26 #include <blocks/wavfile_source.h>
27 #include <cstdio> // for FILE
28 
29 namespace gr {
30  namespace blocks {
31 
33  {
34  private:
35  FILE *d_fp;
36  bool d_repeat;
37 
38  unsigned d_sample_rate;
39  int d_nchans;
40  int d_bytes_per_sample;
41  int d_first_sample_pos;
42  unsigned d_samples_per_chan;
43  unsigned d_sample_idx;
44  int d_normalize_shift;
45  int d_normalize_fac;
46 
47  /*!
48  * \brief Convert an integer sample value to a float value within [-1;1]
49  */
50  float convert_to_float(short int sample);
51 
52  public:
53  wavfile_source_impl(const char *filename, bool repeat);
55 
56  unsigned int sample_rate() const { return d_sample_rate; };
57 
58  int bits_per_sample() const { return d_bytes_per_sample * 8; };
59 
60  int channels() const { return d_nchans; };
61 
62  int work(int noutput_items,
63  gr_vector_const_void_star &input_items,
64  gr_vector_void_star &output_items);
65  };
66 
67  } /* namespace blocks */
68 } /* namespace gr */
69 
70 #endif /* INCLUDED_GR_WAVFILE_SOURCE_IMPL_H */