1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
/* 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,
kSysExBase = 0x7D0
};
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
|
