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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/libtdemid.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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
Send comments and bug fixes to Antonio Larrosa <[email protected]>
***************************************************************************/
#ifndef _TRACK_H
#define _TRACK_H
#include <stdio.h>
#include <libtdemid/dattypes.h>
/**
* An structure that represents a MIDI event.
*
* @short Represents a MIDI event
* @version 0.9.5 17/01/2000
* @author Antonio Larrosa Jimenez <[email protected]>
*/
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 command was a change patch command)
*/
uchar patch;
/**
* Patch (if 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 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 MidiPlayer::loadSong() to load the song and
* later play it with MidiPlayer::play().
*
* @short Stores a MIDI track with a simple API
* @version 0.9.5 17/01/2000
* @author Antonio Larrosa Jimenez <[email protected]>
*/
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 beginning 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
* 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
* 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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