mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-27 04:07:05 +00:00
144 lines
3.5 KiB
C++
144 lines
3.5 KiB
C++
/* ScummVM - Scumm Interpreter
|
|
* Copyright (C) 2001-2005 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.
|
|
*
|
|
* $Header$
|
|
*
|
|
*/
|
|
|
|
#include "stdafx.h"
|
|
#include "sound/midiparser.h"
|
|
#include "sound/mididrv.h"
|
|
#include "common/util.h"
|
|
|
|
|
|
namespace Scumm {
|
|
|
|
//////////////////////////////////////////////////
|
|
//
|
|
// The Standard MIDI File version of MidiParser
|
|
//
|
|
//////////////////////////////////////////////////
|
|
|
|
class MidiParser_RO : public MidiParser {
|
|
protected:
|
|
int _markerCount; // Number of markers encountered in stream so far
|
|
int _lastMarkerCount; // Cache markers until parsed event is actually consumed
|
|
|
|
protected:
|
|
void compressToType0();
|
|
void parseNextEvent (EventInfo &info);
|
|
|
|
public:
|
|
bool loadMusic (byte *data, uint32 size);
|
|
uint32 getTick() { return (uint32) _markerCount * _ppqn / 2; }
|
|
};
|
|
|
|
|
|
|
|
//////////////////////////////////////////////////
|
|
//
|
|
// MidiParser_RO implementation
|
|
//
|
|
//////////////////////////////////////////////////
|
|
|
|
void MidiParser_RO::parseNextEvent (EventInfo &info) {
|
|
_markerCount += _lastMarkerCount;
|
|
_lastMarkerCount = 0;
|
|
|
|
info.delta = 0;
|
|
do {
|
|
info.start = _position._play_pos;
|
|
info.event = *(_position._play_pos++);
|
|
if (info.command() == 0xA) {
|
|
++_lastMarkerCount;
|
|
info.event = 0xF0;
|
|
} else if (info.event == 0xF0) {
|
|
byte delay = *(_position._play_pos++);
|
|
info.delta += delay;
|
|
continue;
|
|
}
|
|
break;
|
|
} while (true);
|
|
|
|
// Seems to indicate EOT
|
|
if (info.event == 0) {
|
|
info.event = 0xFF;
|
|
info.ext.type = 0x2F;
|
|
info.length = 0;
|
|
info.ext.data = 0;
|
|
return;
|
|
}
|
|
|
|
if (info.event < 0x80)
|
|
return;
|
|
|
|
_position._running_status = info.event;
|
|
switch (info.command()) {
|
|
case 0xC:
|
|
info.basic.param1 = *(_position._play_pos++);
|
|
info.basic.param2 = 0;
|
|
break;
|
|
|
|
case 0x8: case 0x9: case 0xB:
|
|
info.basic.param1 = *(_position._play_pos++);
|
|
info.basic.param2 = *(_position._play_pos++);
|
|
if (info.command() == 0x9 && info.basic.param2 == 0)
|
|
info.event = info.channel() | 0x80;
|
|
info.length = 0;
|
|
break;
|
|
|
|
case 0xF: // Marker and EOT messages
|
|
info.length = 0;
|
|
info.ext.data = 0;
|
|
if (info.event == 0xFF) {
|
|
_autoLoop = true;
|
|
info.ext.type = 0x2F;
|
|
} else {
|
|
info.ext.type = 0x7F; // Bogus META
|
|
}
|
|
info.event = 0xFF;
|
|
break;
|
|
}
|
|
}
|
|
|
|
bool MidiParser_RO::loadMusic (byte *data, uint32 size) {
|
|
unloadMusic();
|
|
byte *pos = data;
|
|
|
|
if (memcmp (pos, "RO", 2)) {
|
|
warning("'RO' header expected but found '%c%c' instead", pos[0], pos[1]);
|
|
return false;
|
|
}
|
|
|
|
_num_tracks = 1;
|
|
_ppqn = 120;
|
|
_tracks[0] = pos + 2;
|
|
_markerCount = _lastMarkerCount = 0;
|
|
|
|
// Note that we assume the original data passed in
|
|
// will persist beyond this call, i.e. we do NOT
|
|
// copy the data to our own buffer. Take warning....
|
|
resetTracking();
|
|
setTempo (500000);
|
|
setTrack (0);
|
|
return true;
|
|
}
|
|
|
|
MidiParser *MidiParser_createRO() { return new MidiParser_RO; }
|
|
|
|
} // End of namespace Scumm
|