Source: track.h

# Source: track.h |
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    /*  track.h  - class track, which has a midi file track and its events
        This file is part of LibKMid 0.9.5
        Copyright (C) 1997,98,99,2000  Antonio Larrosa Jimenez
        LibKMid's homepage : http://www.arrakis.es/~rlarrosa/libkmid.html

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

        You should have received a copy of the GNU Library General Public License
        along with this library; see the file COPYING.LIB.  If not, write to
        the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
        Boston, MA 02111-1307, USA.

        Send comments and bug fixes to Antonio Larrosa

    ***************************************************************************/
    #ifndef _TRACK_H
    #define _TRACK_H

    #include
    #include

    /**
     * An structure that represents a MIDI event.
     *
     * @short Represents a MIDI event
     * @version 0.9.5 17/01/2000
     * @author Antonio Larrosa Jimenez
     */
    struct MidiEvent
    {
      /**
       * MIDI Command
       *
       * Caution, if a command doesn't use a variable, it may contain garbage.
       */
      uchar	command;

      /**
       * Channel
       */
      uchar   chn;

      /**
       * Note
       */
      uchar   note;

      /**
       * Velocity
       */
      uchar   vel;

      /**
       * Patch (if @ref #command was a change patch command)
       */
      uchar   patch;

      /**
       * Patch (if @ref #command was a controller command)
       */
      uchar   ctl;

      /**
       * Data 1
       */
      uchar   d1;

      /**
       * Data 2
       */
      uchar   d2;

      /**
       * Data 3
       */
      uchar   d3;

      /**
       * Data 4
       */
      uchar   d4;

      /**
       * Data 5
       */
      uchar   d5;

      /**
       * Data 6
       */
      uchar   d6;

      /**
       * Length of the generic @ref #data variable
       */
      ulong	length;

      /**
       * The data for commands like text, sysex, etc.
       */
      uchar  *data;

    };

    /**
     * Stores a MIDI track. This can be thought of as a list of MIDI events.
     *
     * The data types used to store the track is similar to how events are
     * stored on a MIDI file, but used in a way that allows for faster parses.
     *
     * This class is used on @ref MidiPlayer::loadSong() to load the song and
     * later play it with @ref MidiPlayer::play().
     *
     * @short Stores a MIDI track with a simple API
     * @version 0.9.5 17/01/2000
     * @author Antonio Larrosa Jimenez
     */
    class MidiTrack
    {
      private:
        class MidiTrackPrivate;
        MidiTrackPrivate *d;

        int	id;

        ulong size;
        uchar *data;
        uchar *ptrdata;

        bool  note[16][128]; // Notes that are set on or off by this track
        ulong current_ticks; // Total number of ticks since beggining of song
        ulong delta_ticks;   // Delta ticks from previous event to next event
        ulong wait_ticks;    // Wait ticks from previous event in other track
        // to next event in this track

        ulong currentpos; // Some songs don't have a endoftrack event, so
        // we have to see when currentpos > size
        int	endoftrack;

        ulong readVariableLengthValue(void);

        uchar lastcommand;  // This is to run light without overbyte :-)

        double current_time; // in ms.
        double time_at_previous_tempochange;  // in ms.
        double ticks_from_previous_tempochange; // in ticks
        //	double	time_to_next_event;  // in ms.
        double	time_at_next_event;  // in ms.
        int	tPCN;
        ulong	tempo;

        int	power2to(int i);

      public:
        /**
         * Constructor.
         * @param file the file to read the track from. It should be ready at the
         * start of a track. MidiTrack reads just that track and the file is left at
         * the end of this track).
         * @param tpcn the ticks per cuarter note used in this file.
         * @param Id the ID for this track.
         */
        MidiTrack(FILE *file,int tpcn,int Id);

        /**
         * Destructor
         */
        ~MidiTrack();

        /**
         * Makes the iterator advance the given number of ticks.
         *
         * @return 0 if OK, and 1 if you didn't handle this track well and you
         * forgot to take an event (thing that will never happen if you use
         * @ref MidiPlayer::play() ).
         */
        int	ticksPassed (ulong ticks);

        /**
         * Makes the iterator advance the given number of milliseconds.
         *
         * @return 0 if OK, and 1 if you didn't handle this track well and you
         * forgot to take an event (thing that will never happen if you use
         * @ref MidiPlayer::play() ).
         */
        int	msPassed    (ulong ms);

        /**
         * Returns the current millisecond which the iterator is at.
         */
        int	currentMs   (double ms);

        /**
         * Returns the number of ticks left for the next event.
         */
        ulong	waitTicks   (void) { return wait_ticks; };

        //	ulong   waitMs (void) {return time_to_next_event;};

        /**
         * Returns the absolute number of milliseconds of the next event.
         */
        double   absMsOfNextEvent (void) { return time_at_next_event; };

        /**
         * Change the tempo of the song.
         */
        void 	changeTempo(ulong t);

        /**
         * Reads the event at the iterator position, and puts it on the structure
         * pointed to by @p ev.
         */
        void	readEvent(MidiEvent *ev);

        /**
         * Initializes the iterator.
         */
        void	init(void);

        /**
         * Clears the internal variables.
         */
        void	clear(void);

    };

    #endif

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