wavefile.cc

/*
 * SubTimer source file
 *  Copyright (C) 2005 Peter Salvi
 *   Last modification: <2005.03.23., 16:20:36>
 *
 *  This program 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 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <qdatetime.h>

#include "wavefile.hh"

WaveFile::WaveFile()
{
  opened = false;
  wave = NULL;
  dispbuf = NULL;
}

WaveFile::~WaveFile()
{
  if(wave != NULL)
    delete[] wave;
  if(dispbuf != NULL)
    delete[] dispbuf;
}

bool WaveFile::isOpen() const
{
  return opened;
}

void WaveFile::changeRes(int xres)
{
  if(dispbuf != NULL)
    delete[] dispbuf;
 
  size_t const zoom = xres / (int)(640.0 / MAX_PIXPERSEC);
  pixpersec = MAX_PIXPERSEC / (double)zoom;
  size_t const new_length = wavelength / zoom;
  dispbuf = new char[new_length + 1280];
  for(size_t i = 0; i < new_length;) {
    int min = 0, max = 0;
    for(size_t j = i * zoom; j < (i + 2) * zoom; j += 2) {
      if(wave[j] < min)
        min = wave[j];
      if(wave[j + 1] > max)
        max = wave[j + 1];
    }
    dispbuf[i++] = min;
    dispbuf[i++] = max;
  }
  for(size_t j = 0; j < 1280; ++j)
    dispbuf[new_length + j] = 0;
}

void WaveFile::getDispBuffer(QTime const start, char *buffer) const
{
  size_t const start_index = 
    (size_t)((double)MSECS(start) / 1000.0 * pixpersec) * 2;
  for(size_t i = 0; i < 1280; ++i)
    buffer[i] = dispbuf[start_index + i];
}

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