3 * Copyright 2004,2008 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
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)
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.
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.
27 #include <gr_wavfile_source.h>
28 #include <gr_io_signature.h>
29 #include <gri_wavfile.h>
31 #include <sys/types.h>
35 // win32 (mingw/msvc) specific
40 #define OUR_O_BINARY O_BINARY
42 #define OUR_O_BINARY 0
44 // should be handled via configure
46 #define OUR_O_LARGEFILE O_LARGEFILE
48 #define OUR_O_LARGEFILE 0
52 gr_wavfile_source_sptr
53 gr_make_wavfile_source (const char *filename, bool repeat)
55 return gr_wavfile_source_sptr (new gr_wavfile_source (filename, repeat));
59 gr_wavfile_source::gr_wavfile_source (const char *filename, bool repeat)
60 : gr_sync_block ("wavfile_source",
61 gr_make_io_signature (0, 0, 0),
62 gr_make_io_signature (1, 2, sizeof(float))),
63 d_fp(NULL), d_repeat(repeat),
64 d_sample_rate(1), d_nchans(1), d_bytes_per_sample(2), d_first_sample_pos(0),
65 d_samples_per_chan(0), d_sample_idx(0)
67 // we use "open" to use to the O_LARGEFILE flag
70 if ((fd = open (filename, O_RDONLY | OUR_O_LARGEFILE | OUR_O_BINARY)) < 0) {
72 throw std::runtime_error ("can't open file");
75 if ((d_fp = fdopen (fd, "rb")) == NULL) {
77 throw std::runtime_error ("can't open file");
80 // Scan headers, check file validity
81 if (!gri_wavheader_parse(d_fp,
86 d_samples_per_chan)) {
87 throw std::runtime_error("is not a valid wav file");
90 if (d_samples_per_chan == 0) {
91 throw std::runtime_error("WAV file does not contain any samples");
94 if (d_bytes_per_sample == 1) {
95 d_normalize_fac = 128;
96 d_normalize_shift = 1;
98 d_normalize_fac = 0x7FFF;
99 d_normalize_shift = 0;
102 // Re-set the output signature
103 set_output_signature(gr_make_io_signature(1, d_nchans, sizeof(float)));
107 gr_wavfile_source::~gr_wavfile_source ()
114 gr_wavfile_source::work(int noutput_items,
115 gr_vector_const_void_star &input_items,
116 gr_vector_void_star &output_items)
118 float **out = (float **) &output_items[0];
119 int n_out_chans = output_items.size();
124 for (i = 0; i < noutput_items; i++) {
125 if (d_sample_idx >= d_samples_per_chan) {
127 // if nothing was read at all, say we're done.
131 if (fseek (d_fp, d_first_sample_pos, SEEK_SET) == -1) {
132 fprintf(stderr, "[%s] fseek failed\n", __FILE__);
139 for (int chan = 0; chan < d_nchans; chan++) {
140 sample = gri_wav_read_sample(d_fp, d_bytes_per_sample);
142 if (chan < n_out_chans) {
143 out[chan][i] = convert_to_float(sample);
149 // OK, EOF is not necessarily an error. But we're not going to
150 // deal with handling corrupt wav files, so if they give us any
151 // trouble they won't be processed. Serves them bloody right.
152 if (feof(d_fp) || ferror(d_fp)) {
154 fprintf(stderr, "[%s] WAV file has corrupted header or i/o error\n", __FILE__);
161 return noutput_items;
166 gr_wavfile_source::convert_to_float(short int sample)
168 float sample_out = (float) sample;
169 sample_out /= d_normalize_fac;
170 sample_out -= d_normalize_shift;