/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            dvfile.cc
 *
 *  Thu Jul 28 17:30:48 CEST 2005
 *  Copyright  2005 Bent Bisballe
 *  deva@aasimon.org
 ****************************************************************************/

/*
 *  This file is part of MIaV.
 *
 *  MIaV 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.
 *
 *  MIaV 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 MIaV; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#include "dvfile.h"

#include "dv.h"
#include "util.h"

#include "info.h"

#include <sys/time.h>

dvfile::dvfile()
{
  fp = fopen(TEST_MOVIE, "r");
  if(!fp) MIaV::info->error("Couldn't open %s for reading.", TEST_MOVIE);
}

dvfile::~dvfile()
{
  fclose(fp);
}

Frame *dvfile::readFrame()
{
  timeval tv;

  // Wait untill atleast 1/25th of a second has passed in order to
  // preserve 25fps when enough cpu is available
  gettimeofday(&tv, NULL);
  long long unsigned int diff =
    tv.tv_sec * 1000000LL + 
    tv.tv_usec - last_frame;

  if(diff < (1000000 / 25)) usleep((1000000 / 25) - diff);
  
  unsigned char *ptr = new unsigned char[DVPACKAGE_SIZE];

  if(fp) {
    while(fread(ptr, DVPACKAGE_SIZE, 1, fp) == 0) {
      fseek(fp, 0L, SEEK_SET);
    }
  } else {
    memset(ptr, 0, sizeof(ptr));
  }
  
  Frame *frame = new Frame((char*)ptr, DVPACKAGE_SIZE, VF_DV, NULL, 0, AF_DV);

  gettimeofday(&tv, NULL);
  last_frame = tv.tv_sec * 1000000LL + tv.tv_usec;

  return frame;
}