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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001-2003 The ScummVM project
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* 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 for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*
*/
#ifndef INCLUDED_MIDIPARSER
#define INCLUDED_MIDIPARSER
class MidiParser;
#include "common/scummsys.h"
class MidiDriver;
struct EventInfo {
byte * start; // Points to delta
uint32 delta;
byte event;
union {
struct {
byte param1;
byte param2;
} basic;
struct {
byte type; // Used for METAs
byte * data; // Used for SysEx and METAs
uint32 length; // Used for SysEx and METAs
} ext;
};
byte channel() { return event & 0x0F; }
byte command() { return event >> 4; }
};
class MidiParser {
protected:
MidiDriver *_driver;
uint32 _timer_rate;
uint32 _ppqn; // Pulses (ticks) Per Quarter Note
uint32 _tempo; // Microseconds per quarter note
uint32 _psec_per_tick; // Microseconds per tick (_tempo / _ppqn)
bool _autoLoop; // For lightweight clients that don't monitor events
byte * _tracks[16];
byte _num_tracks;
byte _active_track;
byte * _play_pos;
uint32 _play_time;
uint32 _last_event_time;
uint32 _last_event_tick;
byte _running_status; // Cache of last MIDI command, used in compressed streams
EventInfo _next_event;
protected:
static uint32 readVLQ (byte * &data);
virtual void resetTracking();
virtual void allNotesOff();
virtual void parseNextEvent (EventInfo &info) = 0;
// Multi-byte read helpers
uint32 read4high (byte * &data) {
uint32 val = 0;
int i;
for (i = 0; i < 4; ++i) val = (val << 8) | *data++;
return val;
}
uint16 read2low (byte * &data) {
uint16 val = 0;
int i;
for (i = 0; i < 2; ++i) val |= (*data++) << (i * 8);
return val;
}
public:
enum {
mpMalformedPitchBends = 1,
mpAutoLoop = 2
};
public:
MidiParser();
virtual ~MidiParser() { }
virtual bool loadMusic (byte *data, uint32 size) = 0;
virtual void unloadMusic() = 0;
virtual void property (int prop, int value);
void setMidiDriver (MidiDriver *driver) { _driver = driver; }
void setTimerRate (uint32 rate) { _timer_rate = rate / 500; }
void onTimer();
void setTrack (byte track);
void jumpToTick (uint32 tick);
static MidiParser *createParser_SMF();
static MidiParser *createParser_XMIDI();
static void timerCallback (void *data) { ((MidiParser *) data)->onTimer(); }
};
#endif
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