/*
  ZynAddSubFX - a software synthesizer

  MIDIFile.h - MIDI file loader
  Copyright (C) 2003-2005 Nasca Octavian Paul
  Author: Nasca Octavian Paul

  This program is free software; you can redistribute it and/or modify
  it under the terms of version 2 of the GNU General Public License
  as published by the Free Software Foundation.

  This program 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 General Public License (version 2 or later) for more details.

  You should have received a copy of the GNU General Public License (version 2)
  along with this program; if not, write to the Free Software Foundation,
  Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA

*/

#ifndef MIDIFILE_H
#define MIDIFILE_H

#include "../globals.h"
#include "MIDIEvents.h"

/**MIDI file loader*/
class MIDIFile
{
    public:
        MIDIFile();
        ~MIDIFile();

        /**Loads the given file
             * @param filename The name of the file to load
             * @return -1 if there is an error, otherwise 0*/
        int loadfile(const char *filename);

        //returns -1 if there is an error, otherwise 0
        int parsemidifile(MIDIEvents *me_);

    private:
        MIDIEvents *me;

        unsigned char *midifile;
        int  midifilesize, midifilek;
        bool midieof;

        //returns -1 if there is an error, otherwise 0
        int parsetrack(int ntrack);

        void parsenoteoff(char ntrack, char chan, unsigned int dt);
        void parsenoteon(char ntrack, char chan, unsigned int dt);
        void parsecontrolchange(char ntrack, char chan, unsigned int dt);
        void parsepitchwheel(char ntrack, char chan, unsigned int dt);
        void parsemetaevent(unsigned char mtype, unsigned char mlength);

        void add_dt(char ntrack, unsigned int dt);

        void clearmidifile();

        //convert the delta-time to internal format
        unsigned int convertdt(unsigned int dt);

        /* Low Level MIDIfile functions */

        //get a byte from the midifile
        unsigned char getbyte();

        //peek the current byte from the midifile
        unsigned char peekbyte();

        //get a set of 4 bytes from the midifile
        unsigned int getint32();

        //get a word of 2 bytes from the midifile
        unsigned short int getint16();

        //read a variable length quantity
        unsigned int getvarint32();

        //skip some bytes
        void skipnbytes(int n);

        struct {
            double tick; //how many seconds one tick has
        } data;
};

#endif