nonstop_wavfile_sink_impl.h

/* -*- c++ -*- */
/*
 * Copyright 2008,2009,2013 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.
 */

#ifndef INCLUDED_GR_nonstop_wavfile_SINK_IMPL_H
#define INCLUDED_GR_nonstop_wavfile_SINK_IMPL_H

#include "nonstop_wavfile_sink.h"
#include <gnuradio/blocks/wavfile.h>

namespace gr {
namespace blocks {

class nonstop_wavfile_sink_impl : public nonstop_wavfile_sink
{
private:
	unsigned d_sample_rate;
	int d_nchans;
	unsigned d_sample_count;
	int d_bytes_per_sample;
	int d_bytes_per_sample_new;
	int d_max_sample_val;
	int d_min_sample_val;
	int d_normalize_shift;
	int d_normalize_fac;

	FILE *d_fp;
	FILE *d_new_fp;
	bool d_updated;
	boost::mutex d_mutex;

	/*!
	 * \brief Convert a sample value within [-1;+1] to a corresponding
	 *  short integer value
	 */
	short convert_to_short(float sample);

	/*!
	 * \brief If any file changes have occurred, update now. This is called
	 * internally by work() and thus doesn't usually need to be called by
	 * hand.
	 */
	void do_update();

	/*!
	 * \brief Writes information to the WAV header which is not available
	 * a-priori (chunk size etc.) and closes the file. Not thread-safe and
	 * assumes d_fp is a valid file pointer, should thus only be called by
	 * other methods.
	 */
	void close_wav();

protected:
	bool stop();

public:
	nonstop_wavfile_sink_impl(const char *filename,
	                          int n_channels,
	                          unsigned int sample_rate,
	                          int bits_per_sample);
	~nonstop_wavfile_sink_impl();

	bool open(const char* filename);
	void close();

	void set_sample_rate(unsigned int sample_rate);
	void set_bits_per_sample(int bits_per_sample);

	int bits_per_sample();
	unsigned int sample_rate();

	float length_in_seconds();

	int work(int noutput_items,
	         gr_vector_const_void_star &input_items,
	         gr_vector_void_star &output_items);
};

} /* namespace blocks */
} /* namespace gr */

#endif /* INCLUDED_GR_nonstop_wavfile_SINK_IMPL_H */