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* Copyright 2004,2006,2007,2008 Free Software Foundation, Inc.
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* This file is part of GNU Radio
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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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* 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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* 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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#include <gr_wavfile_sink.h>
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#include <gr_io_signature.h>
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#include <gri_wavfile.h>
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// win32 (mingw/msvc) specific
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#define OUR_O_BINARY O_BINARY
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#define OUR_O_BINARY 0
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// should be handled via configure
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#define OUR_O_LARGEFILE O_LARGEFILE
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#define OUR_O_LARGEFILE 0
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gr_make_wavfile_sink(const char *filename,
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unsigned int sample_rate,
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return gr_wavfile_sink_sptr (new gr_wavfile_sink (filename,
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gr_wavfile_sink::gr_wavfile_sink(const char *filename,
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unsigned int sample_rate,
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: gr_sync_block ("wavfile_sink",
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gr_make_io_signature(1, n_channels, sizeof(float)),
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gr_make_io_signature(0, 0, 0)),
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d_sample_rate(sample_rate), d_nchans(n_channels),
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d_fp(0), d_new_fp(0), d_updated(false)
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if (bits_per_sample != 8 && bits_per_sample != 16) {
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throw std::runtime_error("Invalid bits per sample (supports 8 and 16)");
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d_bytes_per_sample = bits_per_sample / 8;
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d_bytes_per_sample_new = d_bytes_per_sample;
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if (!open(filename)) {
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throw std::runtime_error ("can't open file");
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if (bits_per_sample == 8) {
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d_max_sample_val = 0xFF;
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d_normalize_fac = d_max_sample_val/2;
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d_normalize_shift = 1;
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d_max_sample_val = 0x7FFF;
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d_min_sample_val = -0x7FFF;
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d_normalize_fac = d_max_sample_val;
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d_normalize_shift = 0;
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if (bits_per_sample != 16) {
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fprintf(stderr, "Invalid bits per sample value requested, using 16");
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gr_wavfile_sink::open(const char* filename)
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omni_mutex_lock l(d_mutex);
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// we use the open system call to get access to the O_LARGEFILE flag.
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if ((fd = ::open (filename,
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O_WRONLY|O_CREAT|O_TRUNC|OUR_O_LARGEFILE|OUR_O_BINARY,
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if (d_new_fp) { // if we've already got a new one open, close it
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if ((d_new_fp = fdopen (fd, "wb")) == NULL) {
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::close(fd); // don't leak file descriptor if fdopen fails.
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if (!gri_wavheader_write(d_new_fp,
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d_bytes_per_sample_new)) {
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fprintf(stderr, "[%s] could not write to WAV file\n", __FILE__);
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gr_wavfile_sink::close()
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omni_mutex_lock l(d_mutex);
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void gr_wavfile_sink::close_wav()
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unsigned int byte_count = d_sample_count * d_bytes_per_sample;
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gri_wavheader_complete(d_fp, byte_count);
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gr_wavfile_sink::~gr_wavfile_sink ()
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gr_wavfile_sink::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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float **in = (float **) &input_items[0];
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int n_in_chans = input_items.size();
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short int sample_buf_s;
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do_update(); // update: d_fp is reqd
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if (!d_fp) // drop output on the floor
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return noutput_items;
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for (nwritten = 0; nwritten < noutput_items; nwritten++) {
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for (int chan = 0; chan < d_nchans; chan++) {
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// Write zeros to channels which are in the WAV file
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// but don't have any inputs here
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if (chan < n_in_chans) {
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convert_to_short(in[chan][nwritten]);
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gri_wav_write_sample(d_fp, sample_buf_s, d_bytes_per_sample);
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if (feof(d_fp) || ferror(d_fp)) {
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fprintf(stderr, "[%s] file i/o error\n", __FILE__);
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gr_wavfile_sink::convert_to_short(float sample)
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sample += d_normalize_shift;
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sample *= d_normalize_fac;
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if (sample > d_max_sample_val) {
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sample = d_max_sample_val;
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} else if (sample < d_min_sample_val) {
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sample = d_min_sample_val;
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return (short int) roundf(sample);
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gr_wavfile_sink::set_bits_per_sample(int bits_per_sample)
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omni_mutex_lock l(d_mutex);
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if (bits_per_sample == 8 || bits_per_sample == 16) {
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d_bytes_per_sample_new = bits_per_sample / 8;
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gr_wavfile_sink::set_sample_rate(unsigned int sample_rate)
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omni_mutex_lock l(d_mutex);
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d_sample_rate = sample_rate;
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gr_wavfile_sink::do_update()
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omni_mutex_lock l(d_mutex); // hold mutex for duration of this block
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d_fp = d_new_fp; // install new file pointer
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d_bytes_per_sample = d_bytes_per_sample_new;
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if (d_bytes_per_sample == 1) {
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d_max_sample_val = UCHAR_MAX;
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d_min_sample_val = 0;
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d_normalize_fac = d_max_sample_val/2;
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d_normalize_shift = 1;
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} else if (d_bytes_per_sample == 2) {
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d_max_sample_val = SHRT_MAX;
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d_min_sample_val = SHRT_MIN;
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d_normalize_fac = d_max_sample_val;
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d_normalize_shift = 0;