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/* -*- c++ -*- */
/*
* Copyright 2004,2008,2010,2013 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "wavfile_source_impl.h"
#include <gr_io_signature.h>
#include <blocks/wavfile.h>
#include <sys/types.h>
#include <fcntl.h>
#include <stdexcept>
// win32 (mingw/msvc) specific
#ifdef HAVE_IO_H
#include <io.h>
#endif
#ifdef O_BINARY
#define OUR_O_BINARY O_BINARY
#else
#define OUR_O_BINARY 0
#endif
// should be handled via configure
#ifdef O_LARGEFILE
#define OUR_O_LARGEFILE O_LARGEFILE
#else
#define OUR_O_LARGEFILE 0
#endif
namespace gr {
namespace blocks {
wavfile_source::sptr
wavfile_source::make(const char *filename, bool repeat)
{
return gnuradio::get_initial_sptr
(new wavfile_source_impl(filename, repeat));
}
wavfile_source_impl::wavfile_source_impl (const char *filename, bool repeat)
: gr_sync_block("wavfile_source",
gr_make_io_signature(0, 0, 0),
gr_make_io_signature(1, 2, sizeof(float))),
d_fp(NULL), d_repeat(repeat),
d_sample_rate(1), d_nchans(1), d_bytes_per_sample(2), d_first_sample_pos(0),
d_samples_per_chan(0), d_sample_idx(0)
{
// we use "open" to use to the O_LARGEFILE flag
int fd;
if((fd = open (filename, O_RDONLY | OUR_O_LARGEFILE | OUR_O_BINARY)) < 0) {
perror(filename);
throw std::runtime_error("can't open file");
}
if((d_fp = fdopen(fd, "rb")) == NULL) {
perror(filename);
throw std::runtime_error("can't open file");
}
// Scan headers, check file validity
if(!wavheader_parse(d_fp,
d_sample_rate,
d_nchans,
d_bytes_per_sample,
d_first_sample_pos,
d_samples_per_chan)) {
throw std::runtime_error("is not a valid wav file");
}
if(d_samples_per_chan == 0) {
throw std::runtime_error("WAV file does not contain any samples");
}
if(d_bytes_per_sample == 1) {
d_normalize_fac = 128;
d_normalize_shift = 1;
}
else {
d_normalize_fac = 0x7FFF;
d_normalize_shift = 0;
}
// Re-set the output signature
set_output_signature(gr_make_io_signature(1, d_nchans, sizeof(float)));
}
wavfile_source_impl::~wavfile_source_impl ()
{
fclose(d_fp);
}
float
wavfile_source_impl::convert_to_float(short int sample)
{
float sample_out = (float)sample;
sample_out /= d_normalize_fac;
sample_out -= d_normalize_shift;
return sample_out;
}
int
wavfile_source_impl::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
float **out = (float**)&output_items[0];
int n_out_chans = output_items.size();
int i;
short sample;
for(i = 0; i < noutput_items; i++) {
if(d_sample_idx >= d_samples_per_chan) {
if(!d_repeat) {
// if nothing was read at all, say we're done.
return i ? i : -1;
}
if(fseek (d_fp, d_first_sample_pos, SEEK_SET) == -1) {
fprintf(stderr, "[%s] fseek failed\n", __FILE__);
exit(-1);
}
d_sample_idx = 0;
}
for(int chan = 0; chan < d_nchans; chan++) {
sample = wav_read_sample(d_fp, d_bytes_per_sample);
if(chan < n_out_chans) {
out[chan][i] = convert_to_float(sample);
}
}
d_sample_idx++;
// OK, EOF is not necessarily an error. But we're not going to
// deal with handling corrupt wav files, so if they give us any
// trouble they won't be processed. Serves them bloody right.
if(feof(d_fp) || ferror(d_fp)) {
if(i == 0) {
fprintf(stderr, "[%s] WAV file has corrupted header or i/o error\n", __FILE__);
return -1;
}
return i;
}
}
return noutput_items;
}
} /* namespace blocks */
} /* namespace gr */
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