/usr/include/adplug/xad.h is in libadplug-dev 2.2.1+dfsg3-0.1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 | /*
  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  xad.h - XAD shell player by Riven the Mage <riven@ok.ru>
*/
#ifndef H_ADPLUG_XAD
#define H_ADPLUG_XAD
#include "player.h"
class CxadPlayer: public CPlayer
{
public:
  static CPlayer *factory(Copl *newopl);
        CxadPlayer(Copl * newopl);
        ~CxadPlayer();
        bool	load(const std::string &filename, const CFileProvider &fp);
        bool	update();
        void	rewind(int subsong);
        float	getrefresh();
        std::string     gettype();
        std::string     gettitle();
        std::string     getauthor();
        std::string     getinstrument(unsigned int i);
        unsigned int    getinstruments();
protected:
	virtual void xadplayer_rewind(int subsong) = 0;
	virtual bool xadplayer_load() = 0;
	virtual void xadplayer_update() = 0;
	virtual float xadplayer_getrefresh() = 0;
	virtual std::string xadplayer_gettype() = 0;
	virtual std::string xadplayer_gettitle()
	  {
	    return std::string(xad.title);
	  }
	virtual std::string xadplayer_getauthor()
	  {
	    return std::string(xad.author);
	  }
	virtual std::string xadplayer_getinstrument(unsigned int i)
	  {
	    return std::string("");
	  }
	virtual unsigned int xadplayer_getinstruments()
	  {
	    return 0;
	  }
	enum { HYP=1, PSI, FLASH, BMF, RAT, HYBRID };
        struct xad_header
        {
	    unsigned long   id;
            char            title[36];
            char            author[36];
            unsigned short  fmt;
            unsigned char   speed;
            unsigned char   reserved_a;
        } xad;
        unsigned char * tune;
        unsigned long   tune_size;
        struct
        {
            int             playing;
            int             looping;
            unsigned char   speed;
            unsigned char   speed_counter;
        } plr;
        unsigned char   adlib[256];
        void opl_write(int reg, int val);
};
#endif
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