musix 0.3.3

Music player library for esoteric audio formats (music from C64,Amiga etc)
Documentation 
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/*
 * Adplug - Replayer for many OPL2/OPL3 audio file formats.
 * Copyright (C) 1999 - 2003 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
 *
 * [xad] PSI player, by Riven the Mage <riven@ok.ru>
 */

/*
    - discovery -

  file(s) : 4BIDDEN.COM, PGRID.EXE
     type : Forbidden Dreams BBStro
            Power Grid BBStro
     tune : by Friar Tuck [Shadow Faction/ICE]
   player : by Psi [Future Crew]
  comment : seems to me what 4bidden tune & player was ripped from pgrid

  file(s) : MYSTRUNE.COM
     type : Mystical Runes BBStro
     tune : by ?
   player : by Psi [Future Crew]
*/

#include "psi.h"
#include "debug.h"

const unsigned char CxadpsiPlayer::psi_adlib_registers[99] =
{
  0x20, 0x23, 0x40, 0x43, 0x60, 0x63, 0x80, 0x83, 0xE0, 0xE3, 0xC0,
  0x21, 0x24, 0x41, 0x44, 0x61, 0x64, 0x81, 0x84, 0xE1, 0xE4, 0xC1,
  0x22, 0x25, 0x42, 0x45, 0x62, 0x65, 0x82, 0x85, 0xE2, 0xE5, 0xC2,
  0x28, 0x2B, 0x48, 0x4B, 0x68, 0x6B, 0x88, 0x8B, 0xE8, 0xEB, 0xC3,
  0x29, 0x2C, 0x49, 0x4C, 0x69, 0x6C, 0x89, 0x8C, 0xE9, 0xEC, 0xC4,
  0x2A, 0x2D, 0x4A, 0x4D, 0x6A, 0x6D, 0x8A, 0x8D, 0xEA, 0xED, 0xC5,
  0x30, 0x33, 0x50, 0x53, 0x70, 0x73, 0x90, 0x93, 0xF0, 0xF3, 0xC6,
  0x31, 0x34, 0x51, 0x54, 0x71, 0x74, 0x91, 0x94, 0xF1, 0xF4, 0xC7,
  0x32, 0x35, 0x52, 0x55, 0x72, 0x75, 0x92, 0x95, 0xF2, 0xF5, 0xC8
};

const unsigned short CxadpsiPlayer::psi_notes[16] =
{
  0x216B, 0x2181, 0x2198, 0x21B0, 0x21CA, 0x21E5, 0x2202, 0x2220,
  0x2241, 0x2263, 0x2287, 0x2364,
  0x0000, 0x0000, 0x0000, 0x0000 // by riven
};

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

void CxadpsiPlayer::xadplayer_rewind(int subsong)
{
  opl_write(0x01, 0x20);
  opl_write(0x08, 0x00);
  opl_write(0xBD, 0x00);

  // get header
  header.instr_ptr = (tune[1] << 8) + tune[0];
  header.seq_ptr = (tune[3] << 8) + tune[2];

  // define instruments
  psi.instr_table = &tune[header.instr_ptr];

  for(int i=0; i<8; i++)
  {
    for(int j=0; j<11; j++) {
      unsigned short inspos = (psi.instr_table[i * 2 + 1] << 8) + psi.instr_table[i * 2];

      opl_write(psi_adlib_registers[i*11 + j],tune[inspos + j]);
    }

    opl_write(0xA0+i, 0x00);
    opl_write(0xB0+i, 0x00);

    psi.note_delay[i] = 1;
    psi.note_curdelay[i] = 1;
    psi.looping[i] = 0;
  }

  // calculate sequence pointer
  psi.seq_table = &tune[header.seq_ptr];
}

void CxadpsiPlayer::xadplayer_update()
{
  unsigned short ptr;

  for(int i=0; i<8; i++)
  {
    ptr = (psi.seq_table[(i<<1) * 2 + 1] << 8) + psi.seq_table[(i<<1) * 2];

    psi.note_curdelay[i]--;

    if (!psi.note_curdelay[i])
    {
      opl_write(0xA0+i, 0x00);
      opl_write(0xB0+i, 0x00);

      unsigned char event = tune[ptr++];
#ifdef DEBUG
  AdPlug_LogWrite("channel %02X, event %02X:\n",i+1,event);
#endif

      // end of sequence ?
      if (!event)
      {
	ptr = (psi.seq_table[(i<<1) * 2 + 3] << 8) + psi.seq_table[(i<<1) * 2 + 2];

        event = tune[ptr++];
#ifdef DEBUG
  AdPlug_LogWrite(" channel %02X, event %02X:\n",i+1,event);
#endif

        // set sequence loop flag
        psi.looping[i] = 1;

        // module loop ?
        plr.looping = 1;
        for(int j=0; j<8; j++)
          plr.looping &= psi.looping[j];
      }

      // new note delay ?
      if (event & 0x80)
      {
        psi.note_delay[i] = (event & 0x7F);

        event = tune[ptr++];
#ifdef DEBUG
  AdPlug_LogWrite("  channel %02X, event %02X:\n",i+1,event);
#endif
      }

      psi.note_curdelay[i] = psi.note_delay[i];

      // play note
      unsigned short note = psi_notes[event & 0x0F];

      opl_write(0xA0+i, note & 0xFF);
      opl_write(0xB0+i, (note >> 8) + ((event >> 2) & 0xFC));

      // save position
      psi.seq_table[(i<<1) * 2] = ptr & 0xff;
      psi.seq_table[(i<<1) * 2 + 1] = ptr >> 8;
    }
  }
}

float CxadpsiPlayer::xadplayer_getrefresh()
{
  return 70.0f;
}

std::string CxadpsiPlayer::xadplayer_gettype()
{
  return std::string("xad: psi player");
}

unsigned int CxadpsiPlayer::xadplayer_getinstruments()
{
  return 8;
}