wavfile_source_impl.h

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/* -*- c++ -*- */
/*
 * Copyright 2004,2008,2013 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_SOURCE_IMPL_H
#define INCLUDED_GR_WAVFILE_SOURCE_IMPL_H

#include <blocks/wavfile_source.h>
#include <cstdio>  // for FILE

namespace gr {
  namespace blocks {

    class wavfile_source_impl : public wavfile_source
    {
    private:
      FILE *d_fp;
      bool d_repeat;

      unsigned d_sample_rate;
      int d_nchans;
      int d_bytes_per_sample;
      int d_first_sample_pos;
      unsigned d_samples_per_chan;
      unsigned d_sample_idx;
      int d_normalize_shift;
      int d_normalize_fac;

      /*!
       * \brief Convert an integer sample value to a float value within [-1;1]
       */
      float convert_to_float(short int sample);

    public:
      wavfile_source_impl(const char *filename, bool repeat);
      ~wavfile_source_impl();

      unsigned int sample_rate() const { return d_sample_rate; };

      int bits_per_sample() const { return d_bytes_per_sample * 8; };

      int channels() const { return d_nchans; };

      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_SOURCE_IMPL_H */