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Diffstat (limited to 'engines/scumm/imuse/mac_m68k.h')
-rw-r--r-- | engines/scumm/imuse/mac_m68k.h | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/engines/scumm/imuse/mac_m68k.h b/engines/scumm/imuse/mac_m68k.h new file mode 100644 index 0000000000..59e2f68b9b --- /dev/null +++ b/engines/scumm/imuse/mac_m68k.h @@ -0,0 +1,177 @@ +/* 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 |