wavfile_sink_impl.h

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/* -*- 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_WAVFILE_SINK_IMPL_H
#define INCLUDED_GR_WAVFILE_SINK_IMPL_H

#include <blocks/wavfile_sink.h>
#include <gr_file_sink_base.h>

namespace gr {
  namespace blocks {

    class wavfile_sink_impl : public 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();

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

      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_WAVFILE_SINK_IMPL_H */