1 /* -*- c++ -*- */
2 /*
3  * Copyright 2008,2009,2013 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_SINK_IMPL_H
24 #define INCLUDED_GR_WAVFILE_SINK_IMPL_H
25 
26 #include <gnuradio/blocks/wavfile_sink.h>
27 
28 namespace gr {
29 namespace blocks {
30 
31 class wavfile_sink_impl : public wavfile_sink
32 {
33 private:
34     unsigned d_sample_rate;
35     int d_nchans;
36     unsigned d_sample_count;
37     int d_bytes_per_sample;
38     int d_bytes_per_sample_new;
39     int d_max_sample_val;
40     int d_min_sample_val;
41     int d_normalize_shift;
42     int d_normalize_fac;
43 
44     FILE* d_fp;
45     FILE* d_new_fp;
46     bool d_updated;
47     boost::mutex d_mutex;
48 
49     /*!
50      * \brief Convert a sample value within [-1;+1] to a corresponding
51      *  short integer value
52      */
53     short convert_to_short(float sample);
54 
55     /*!
56      * \brief If any file changes have occurred, update now. This is called
57      * internally by work() and thus doesn't usually need to be called by
58      * hand.
59      */
60     void do_update();
61 
62     /*!
63      * \brief Writes information to the WAV header which is not available
64      * a-priori (chunk size etc.) and closes the file. Not thread-safe and
65      * assumes d_fp is a valid file pointer, should thus only be called by
66      * other methods.
67      */
68     void close_wav();
69 
70 protected:
71     bool stop();
72 
73 public:
74     wavfile_sink_impl(const char* filename,
75                       int n_channels,
76                       unsigned int sample_rate,
77                       int bits_per_sample);
78     ~wavfile_sink_impl();
79 
80     bool open(const char* filename);
81     void close();
82 
83     void set_sample_rate(unsigned int sample_rate);
84     void set_bits_per_sample(int bits_per_sample);
85 
86     int bits_per_sample();
87     unsigned int sample_rate();
88 
89     int work(int noutput_items,
90              gr_vector_const_void_star& input_items,
91              gr_vector_void_star& output_items);
92 };
93 
94 } /* namespace blocks */
95 } /* namespace gr */
96 
97 #endif /* INCLUDED_GR_WAVFILE_SINK_IMPL_H */
98