gr_wavfile_source.h

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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2004,2008 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_WAVFILE_SOURCE_H
00024 #define INCLUDED_GR_WAVFILE_SOURCE_H
00025 
00026 #include <gr_sync_block.h>
00027 
00028 class gr_wavfile_source;
00029 typedef boost::shared_ptr<gr_wavfile_source> gr_wavfile_source_sptr;
00030 
00031 gr_wavfile_source_sptr
00032 gr_make_wavfile_source (const char *filename, bool repeat = false);
00033 
00043 class gr_wavfile_source : public gr_sync_block
00044 {
00045 private:
00046   friend gr_wavfile_source_sptr gr_make_wavfile_source (const char *filename,
00047                                                               bool repeat);
00048   gr_wavfile_source(const char *filename, bool repeat);
00049 
00050   FILE *d_fp;
00051   bool d_repeat;
00052   
00053   unsigned d_sample_rate;
00054   int d_nchans;
00055   int d_bytes_per_sample;
00056   int d_first_sample_pos;
00057   unsigned d_samples_per_chan;
00058   unsigned d_sample_idx;
00059   int d_normalize_shift;
00060   int d_normalize_fac;
00061   
00065   float convert_to_float(short int sample);
00066 
00067 public:
00068   ~gr_wavfile_source ();
00069   
00070   int work(int noutput_items,
00071            gr_vector_const_void_star &input_items,
00072            gr_vector_void_star &output_items);
00073 
00077   unsigned int sample_rate() const { return d_sample_rate; };
00078 
00083   int bits_per_sample() const { return d_bytes_per_sample * 8; };
00084   
00090   int channels() const { return d_nchans; };
00091 };
00092 
00093 #endif /* INCLUDED_GR_WAVFILE_SOURCE_H */

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