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/* -*- c++ -*- */
/*
* Copyright 2004,2008 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDED_GR_WAVFILE_SOURCE_H
#define INCLUDED_GR_WAVFILE_SOURCE_H
#include <gr_core_api.h>
#include <gr_sync_block.h>
#include <cstdio> // for FILE
class gr_wavfile_source;
typedef boost::shared_ptr<gr_wavfile_source> gr_wavfile_source_sptr;
GR_CORE_API gr_wavfile_source_sptr
gr_make_wavfile_source (const char *filename, bool repeat = false);
/*!
* \brief Read stream from a Microsoft PCM (.wav) file, output floats
*
* Unless otherwise called, values are within [-1;1].
* Check gr_make_wavfile_source() for extra info.
*
* \ingroup source_blk
*/
class GR_CORE_API gr_wavfile_source : public gr_sync_block
{
private:
friend GR_CORE_API gr_wavfile_source_sptr gr_make_wavfile_source (const char *filename,
bool repeat);
gr_wavfile_source(const char *filename, bool repeat);
FILE *d_fp;
bool d_repeat;
unsigned d_sample_rate;
int d_nchans;
int d_bytes_per_sample;
int d_first_sample_pos;
unsigned d_samples_per_chan;
unsigned d_sample_idx;
int d_normalize_shift;
int d_normalize_fac;
/*!
* \brief Convert an integer sample value to a float value within [-1;1]
*/
float convert_to_float(short int sample);
public:
~gr_wavfile_source ();
int work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items);
/*!
* \brief Read the sample rate as specified in the wav file header
*/
unsigned int sample_rate() const { return d_sample_rate; };
/*!
* \brief Return the number of bits per sample as specified in the wav
* file header. Only 8 or 16 bit are supported here.
*/
int bits_per_sample() const { return d_bytes_per_sample * 8; };
/*!
* \brief Return the number of channels in the wav file as specified in
* the wav file header. This is also the max number of outputs you can
* have.
*/
int channels() const { return d_nchans; };
};
#endif /* INCLUDED_GR_WAVFILE_SOURCE_H */
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