msc.h

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/*
 * Adplug - Replayer for many OPL2/OPL3 audio file formats.
 * Copyright (C) 1999 - 2006 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
 *
 * msc.h - MSC Player by Lubomir Bulej (pallas@kadan.cz)
 */
 
#include "player.h"
 
#define MSC_SIGN_LEN    16
#define MSC_DESC_LEN    64
 
class CmscPlayer: public CPlayer
{
 public:
  static CPlayer * factory(Copl * newopl);
 
  CmscPlayer(Copl * newopl);
  ~CmscPlayer();
        
  bool load(const std::string &filename, const CFileProvider &fp);
  bool update();
  void rewind(int subsong);
  float getrefresh();
 
  std::string gettype ();
 
 protected:
  typedef unsigned char         u8;
  typedef unsigned short        u16;
 
  struct msc_header {
    u8  mh_sign [MSC_SIGN_LEN];
    u16 mh_ver;
    u8  mh_desc [MSC_DESC_LEN];
    u16 mh_timer;
    u16 mh_nr_blocks;
    u16 mh_block_len;
  };
 
  struct msc_block {
    u16         mb_length;
    u8 *        mb_data;
  };
 
  // file data
  char *                desc;           // song desctiption
  unsigned short        version;        // file version
  unsigned short        nr_blocks;      // number of music blocks
  unsigned short        block_len;      // maximal block length
  unsigned short        timer_div;      // timer divisor
  msc_block *           msc_data;       // compressed music data
 
  // decoder state
  unsigned long block_num;      // active block
  unsigned long block_pos;      // position in block
  unsigned long raw_pos;        // position in data buffer
  u8 *          raw_data;       // decompression buffer
 
  u8            dec_prefix;     // prefix / state
  int           dec_dist;       // prefix distance
  unsigned int  dec_len;        // prefix length
        
  // player state
  unsigned char delay;          // active delay
  unsigned long play_pos;       // player position
 
 private:
  static const u8 msc_signature [MSC_SIGN_LEN];
 
  bool load_header (binistream * bf, msc_header * hdr);
  bool decode_octet (u8 * output);
};