/*
 * Adplug - Replayer for many OPL2/OPL3 audio file formats.
 * Copyright (C) 1999 - 2005 Simon Peter, <dn.tlp@gmx.net>, et al.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * raw.c - RAW Player by Simon Peter <dn.tlp@gmx.net>
 */

#include <string.h>

#include "raw.h"

/*** public methods *************************************/

CPlayer *
CrawPlayer::factory (Copl * newopl)
{
  return new CrawPlayer (newopl);
}

bool
CrawPlayer::load (VFSFile * fd, const CFileProvider & fp)
{
  binistream *f = fp.open (fd);
  if (!f)
    return false;
  char id[8];
  unsigned long i;

  // file validation section
  f->readString (id, 8);
  if (strncmp (id, "RAWADATA", 8))
  {
    fp.close (f);
    return false;
  }

  // load section
  clock = f->readInt (2);       // clock speed
  length = (fp.filesize (f) - 10) / 2;
  data = new Tdata[length];
  for (i = 0; i < length; i++)
  {
    data[i].param = f->readInt (1);
    data[i].command = f->readInt (1);
  }

  fp.close (f);
  rewind (0);
  return true;
}

bool
CrawPlayer::update ()
{
  bool setspeed;

  if (pos >= length)
    return false;

  if (del)
  {
    del--;
    return !songend;
  }

  do
  {
    setspeed = false;
    switch (data[pos].command)
    {
    case 0:
      del = data[pos].param - 1;
      break;
    case 2:
      if (!data[pos].param)
      {
        pos++;
        speed = data[pos].param + (data[pos].command << 8);
        setspeed = true;
      }
      else
        opl->setchip (data[pos].param - 1);
      break;
    case 0xff:
      if (data[pos].param == 0xff)
      {
        rewind (0);             // auto-rewind song
        songend = true;
        return !songend;
      }
      break;
    default:
      opl->write (data[pos].command, data[pos].param);
      break;
    }
  } while (data[pos++].command || setspeed);

  return !songend;
}

void
CrawPlayer::rewind (int subsong)
{
  pos = del = 0;
  speed = clock;
  songend = false;
  opl->init ();
  opl->write (1, 32);           // go to 9 channel mode
}

float
CrawPlayer::getrefresh ()
{
  return 1193180.0 / (speed ? speed : 0xffff);  // timer oscillator speed / wait register = clock frequency
}
