/*
 * Adplug - Replayer for many OPL2/OPL3 audio file formats.
 * Copyright (C) 1999 - 2007 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
 *
 * dro2.cpp - DOSBox Raw OPL v2.0 player by Adam Nielsen <malvineous@shikadi.net>
 */

#include <cstring>
#include <stdio.h>

#include "dro2.h"

CPlayer *Cdro2Player::factory(Copl *newopl)
{
  return new Cdro2Player(newopl);
}

Cdro2Player::Cdro2Player(Copl *newopl) :
        CPlayer(newopl),
        piConvTable(NULL),
        data(0)
{
}

Cdro2Player::~Cdro2Player()
{
        if (this->data) delete[] this->data;
        if (this->piConvTable) delete[] this->piConvTable;
}

bool Cdro2Player::load(const std::string &filename, const CFileProvider &fp)
{
        binistream *f = fp.open(filename);
        if (!f) return false;

        char id[8];
        f->readString(id, 8);
        if (strncmp(id, "DBRAWOPL", 8)) {
                fp.close(f);
                return false;
        }
        int version = f->readInt(4);
        if (version != 0x2) {
                fp.close(f);
                return false;
        }

        this->iLength = f->readInt(4) * 2; // stored in file as number of byte pairs
        f->ignore(4);   // Length in milliseconds
        f->ignore(1);   /// OPL type (0 == OPL2, 1 == Dual OPL2, 2 == OPL3)
        int iFormat = f->readInt(1);
        if (iFormat != 0) {
                fp.close(f);
                return false;
        }
        int iCompression = f->readInt(1);
        if (iCompression != 0) {
                fp.close(f);
                return false;
        }
        this->iCmdDelayS = f->readInt(1);
        this->iCmdDelayL = f->readInt(1);
        this->iConvTableLen = f->readInt(1);

        this->piConvTable = new uint8_t[this->iConvTableLen];
        f->readString((char *)this->piConvTable, this->iConvTableLen);

        this->data = new uint8_t[this->iLength];
        f->readString((char *)this->data, this->iLength);

        fp.close(f);
        rewind(0);

        return true;
}

bool Cdro2Player::update()
{
        while (this->iPos < this->iLength) {
                int iIndex = this->data[this->iPos++];
                int iValue = this->data[this->iPos++];

                // Short delay
                if (iIndex == this->iCmdDelayS) {
                        this->iDelay = iValue + 1;
                        return true;

                // Long delay
                } else if (iIndex == this->iCmdDelayL) {
                        this->iDelay = (iValue + 1) << 8;
                        return true;

                // Normal write
                } else {
                        if (iIndex & 0x80) {
                                // High bit means use second chip in dual-OPL2 config
                                this->opl->setchip(1);
                          iIndex &= 0x7F;
                        } else {
                          this->opl->setchip(0);
                        }
                        if (iIndex > this->iConvTableLen) {
                                printf("DRO2: Error - index beyond end of codemap table!  Corrupted .dro?\n");
                                return false; // EOF
                        }
                        int iReg = this->piConvTable[iIndex];
                        this->opl->write(iReg, iValue);
                }

        }

        // This won't result in endless-play using Adplay, but IMHO that code belongs
        // in Adplay itself, not here.
  return this->iPos < this->iLength;
}

void Cdro2Player::rewind(int subsong)
{
        this->iDelay = 0;
        this->iPos = 0;
  opl->init();
}

float Cdro2Player::getrefresh()
{
        if (this->iDelay > 0) return 1000.0 / this->iDelay;
        else return 1000.0;
}
