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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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#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 IMuseDriver_MacM68k : public MidiDriver_Emulated {
friend class MidiChannel_MacM68k;
public:
IMuseDriver_MacM68k(Audio::Mixer *mixer);
~IMuseDriver_MacM68k() override;
int open() override;
void close() override;
void send(uint32 d) override;
MidiChannel *allocateChannel() override;
MidiChannel *getPercussionChannel() override { return nullptr; }
bool isStereo() const override { return false; }
int getRate() const override {
// 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:
void generateSamples(int16 *buf, int len) override;
void onTimer() override {}
private:
int *_mixBuffer;
int _mixBufferLength;
struct Instrument {
Instrument() { reset(); }
uint length;
uint sampleRate;
uint loopStart;
uint loopEnd;
int baseFrequency;
byte *data;
void reset() {
length = 0;
sampleRate = 0;
loopStart = 0;
loopEnd = 0;
baseFrequency = 0;
data = nullptr;
}
};
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 IMuseDriver_MacM68k;
public:
MidiChannel_MacM68k(IMuseDriver_MacM68k *driver, byte number) : MidiChannel(), _owner(driver), _number(number), _allocated(false),
_priority(0), _sustain(0), _pitchBend(0), _pitchBendFactor(2), _transpose(0), _detune(0), _volume(0), _voice(nullptr), _instrument() {}
MidiDriver *device() override { return _owner; }
byte getNumber() override { return _number; }
void release() override;
void send(uint32 b) override;
void noteOff(byte note) override;
void noteOn(byte note, byte velocity) override;
void programChange(byte program) override;
void pitchBend(int16 bend) override;
void controlChange(byte control, byte value) override;
void pitchBendFactor(byte value) override;
void transpose(int8 value) override;
void detune(int16 value) override;
void priority(byte value) override;
void sysEx_customInstrument(uint32 type, const byte *instr, uint32 dataSize) override;
bool allocate();
void addVoice(VoiceChannel *voice);
void removeVoice(VoiceChannel *voice);
private:
IMuseDriver_MacM68k *_owner;
const byte _number;
bool _allocated;
VoiceChannel *_voice;
int _priority;
int _sustain;
Instrument _instrument;
int _pitchBend;
int _pitchBendFactor;
int8 _detune;
int8 _transpose;
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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