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