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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef SCUMM_IMUSE_MAC_M68K_H
#define SCUMM_IMUSE_MAC_M68K_H
#include "audio/softsynth/emumidi.h"
#include "common/hashmap.h"
namespace Common {
class SeekableReadStream;
}
namespace Scumm {
class MacM68kDriver : public MidiDriver_Emulated {
friend class MidiChannel_MacM68k;
public:
MacM68kDriver(Audio::Mixer *mixer);
~MacM68kDriver();
virtual int open();
virtual void close();
virtual void send(uint32 d);
virtual void sysEx_customInstrument(byte channel, uint32 type, const byte *instr);
virtual MidiChannel *allocateChannel();
virtual MidiChannel *getPercussionChannel() { return 0; }
virtual bool isStereo() const { return false; }
virtual int getRate() const {
// The original is using a frequency of approx. 22254.54546 here.
// To be precise it uses the 16.16 fixed point value 0x56EE8BA3.
return 22254;
}
protected:
virtual void generateSamples(int16 *buf, int len);
virtual void onTimer() {}
private:
int *_mixBuffer;
int _mixBufferLength;
struct Instrument {
uint length;
uint sampleRate;
uint loopStart;
uint loopEnd;
int baseFrequency;
byte *data;
};
enum {
kDefaultInstrument = 0x3E7,
kProgramChangeBase = 0x3E8
};
Instrument getInstrument(int idx) const;
typedef Common::HashMap<int, Instrument> InstrumentMap;
InstrumentMap _instruments;
Instrument _defaultInstrument;
void loadAllInstruments();
void addInstrument(int idx, Common::SeekableReadStream *data);
struct OutputChannel {
int pitchModifier;
const byte *instrument;
uint subPos;
const byte *start;
const byte *end;
const byte *soundStart;
const byte *soundEnd;
const byte *loopStart;
const byte *loopEnd;
int frequency;
int volume;
bool isFinished;
int baseFrequency;
};
void setPitch(OutputChannel *out, int frequency);
int _pitchTable[128];
byte *_volumeTable;
static const int _volumeBaseTable[32];
class MidiChannel_MacM68k;
struct VoiceChannel {
MidiChannel_MacM68k *part;
VoiceChannel *prev, *next;
int channel;
int note;
bool sustainNoteOff;
OutputChannel out;
void off();
};
class MidiChannel_MacM68k : public MidiChannel {
friend class MacM68kDriver;
public:
virtual MidiDriver *device() { return _owner; }
virtual byte getNumber() { return _number; }
virtual void release();
virtual void send(uint32 b);
virtual void noteOff(byte note);
virtual void noteOn(byte note, byte velocity);
virtual void programChange(byte program);
virtual void pitchBend(int16 bend);
virtual void controlChange(byte control, byte value);
virtual void pitchBendFactor(byte value);
virtual void priority(byte value);
virtual void sysEx_customInstrument(uint32 type, const byte *instr);
void init(MacM68kDriver *owner, byte channel);
bool allocate();
void addVoice(VoiceChannel *voice);
void removeVoice(VoiceChannel *voice);
private:
MacM68kDriver *_owner;
bool _allocated;
int _number;
VoiceChannel *_voice;
int _priority;
int _sustain;
Instrument _instrument;
int _pitchBend;
int _pitchBendFactor;
int _volume;
};
MidiChannel_MacM68k _channels[32];
enum {
kChannelCount = 8
};
VoiceChannel _voiceChannels[kChannelCount];
int _lastUsedVoiceChannel;
VoiceChannel *allocateVoice(int priority);
};
} // End of namespace Scumm
#endif
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