diff options
Diffstat (limited to 'engines/agos/drivers/accolade/mt32.cpp')
-rw-r--r-- | engines/agos/drivers/accolade/mt32.cpp | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/engines/agos/drivers/accolade/mt32.cpp b/engines/agos/drivers/accolade/mt32.cpp new file mode 100644 index 0000000000..319e0ebf56 --- /dev/null +++ b/engines/agos/drivers/accolade/mt32.cpp @@ -0,0 +1,278 @@ +/* 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. + * + */ + +#include "agos/agos.h" +#include "agos/drivers/accolade/mididriver.h" + +#include "audio/mididrv.h" + +#include "common/config-manager.h" +#include "common/file.h" +#include "common/mutex.h" +#include "common/system.h" +#include "common/textconsole.h" + +namespace AGOS { + +class MidiDriver_Accolade_MT32 : public MidiDriver { +public: + MidiDriver_Accolade_MT32(); + virtual ~MidiDriver_Accolade_MT32(); + + // MidiDriver + int open(); + void close(); + bool isOpen() const { return _isOpen; } + + void send(uint32 b); + + MidiChannel *allocateChannel() { + if (_driver) + return _driver->allocateChannel(); + return NULL; + } + MidiChannel *getPercussionChannel() { + if (_driver) + return _driver->getPercussionChannel(); + return NULL; + } + + void setTimerCallback(void *timer_param, Common::TimerManager::TimerProc timer_proc) { + if (_driver) + _driver->setTimerCallback(timer_param, timer_proc); + } + + uint32 getBaseTempo() { + if (_driver) { + return _driver->getBaseTempo(); + } + return 1000000 / _baseFreq; + } + +protected: + Common::Mutex _mutex; + MidiDriver *_driver; + bool _nativeMT32; // native MT32, may also be our MUNT, or MUNT over MIDI + + bool _isOpen; + int _baseFreq; + +private: + // simple mapping between MIDI channel and MT32 channel + byte _channelMapping[AGOS_MIDI_CHANNEL_COUNT]; + // simple mapping between MIDI instruments and MT32 instruments + byte _instrumentMapping[AGOS_MIDI_INSTRUMENT_COUNT]; + +public: + bool setupInstruments(byte *instrumentData, uint16 instrumentDataSize, bool useMusicDrvFile); +}; + +MidiDriver_Accolade_MT32::MidiDriver_Accolade_MT32() { + _driver = NULL; + _isOpen = false; + _nativeMT32 = false; + _baseFreq = 250; + + memset(_channelMapping, 0, sizeof(_channelMapping)); + memset(_instrumentMapping, 0, sizeof(_instrumentMapping)); +} + +MidiDriver_Accolade_MT32::~MidiDriver_Accolade_MT32() { + Common::StackLock lock(_mutex); + if (_driver) { + _driver->setTimerCallback(0, 0); + _driver->close(); + delete _driver; + } + _driver = NULL; +} + +int MidiDriver_Accolade_MT32::open() { + assert(!_driver); + +// debugC(kDebugLevelMT32Driver, "MT32: starting driver"); + + // Setup midi driver + MidiDriver::DeviceHandle dev = MidiDriver::detectDevice(MDT_MIDI | MDT_PREFER_MT32); + MusicType musicType = MidiDriver::getMusicType(dev); + + // check, if we got a real MT32 (or MUNT, or MUNT over MIDI) + switch (musicType) { + case MT_MT32: + _nativeMT32 = true; + break; + case MT_GM: + if (ConfMan.getBool("native_mt32")) { + _nativeMT32 = true; + } + break; + default: + break; + } + + _driver = MidiDriver::createMidi(dev); + if (!_driver) + return 255; + + int ret = _driver->open(); + if (ret) + return ret; + + if (_nativeMT32) + _driver->sendMT32Reset(); + else + _driver->sendGMReset(); + + return 0; +} + +void MidiDriver_Accolade_MT32::close() { + if (_driver) { + _driver->close(); + } +} + +// MIDI messages can be found at http://www.midi.org/techspecs/midimessages.php +void MidiDriver_Accolade_MT32::send(uint32 b) { + byte command = b & 0xf0; + byte channel = b & 0xf; + + if (command == 0xF0) { + if (_driver) { + _driver->send(b); + } + return; + } + + byte mappedChannel = _channelMapping[channel]; + + if (mappedChannel < AGOS_MIDI_CHANNEL_COUNT) { + // channel mapped to an actual MIDI channel, so use that one + b = (b & 0xFFFFFFF0) | mappedChannel; + if (command == 0xC0) { + // Program change + // Figure out the requested instrument + byte midiInstrument = (b >> 8) & 0xFF; + byte mappedInstrument = _instrumentMapping[midiInstrument]; + + // If there is no actual MT32 (or MUNT), we make a second mapping to General MIDI instruments + if (!_nativeMT32) { + mappedInstrument = (MidiDriver::_mt32ToGm[mappedInstrument]); + } + // And replace it + b = (b & 0xFFFF00FF) | (mappedInstrument << 8); + } + + if (_driver) { + _driver->send(b); + } + } +} + +// Called right at the start, we get an INSTR.DAT entry +bool MidiDriver_Accolade_MT32::setupInstruments(byte *driverData, uint16 driverDataSize, bool useMusicDrvFile) { + uint16 channelMappingOffset = 0; + uint16 channelMappingSize = 0; + uint16 instrumentMappingOffset = 0; + uint16 instrumentMappingSize = 0; + + if (!useMusicDrvFile) { + // INSTR.DAT: we expect at least 354 bytes + if (driverDataSize < 354) + return false; + + // Data is like this: + // 128 bytes instrument mapping + // 128 bytes instrument volume adjust (signed!) (not used for MT32) + // 16 bytes unknown + // 16 bytes channel mapping + // 64 bytes key note mapping (not really used for MT32) + // 1 byte instrument count + // 1 byte bytes per instrument + // x bytes no instruments used for MT32 + + channelMappingOffset = 256 + 16; + channelMappingSize = 16; + instrumentMappingOffset = 0; + instrumentMappingSize = 128; + + } else { + // MUSIC.DRV: we expect at least 468 bytes + if (driverDataSize < 468) + return false; + + channelMappingOffset = 396; + channelMappingSize = 16; + instrumentMappingOffset = 140; + instrumentMappingSize = 128; + } + + // Channel mapping + if (channelMappingSize) { + // Get these 16 bytes for MIDI channel mapping + if (channelMappingSize != sizeof(_channelMapping)) + return false; + + memcpy(_channelMapping, driverData + channelMappingOffset, sizeof(_channelMapping)); + } else { + // Set up straight mapping + for (uint16 channelNr = 0; channelNr < sizeof(_channelMapping); channelNr++) { + _channelMapping[channelNr] = channelNr; + } + } + + if (instrumentMappingSize) { + // And these for instrument mapping + if (instrumentMappingSize > sizeof(_instrumentMapping)) + return false; + + memcpy(_instrumentMapping, driverData + instrumentMappingOffset, instrumentMappingSize); + } + // Set up straight mapping for the remaining data + for (uint16 instrumentNr = instrumentMappingSize; instrumentNr < sizeof(_instrumentMapping); instrumentNr++) { + _instrumentMapping[instrumentNr] = instrumentNr; + } + return true; +} + +MidiDriver *MidiDriver_Accolade_MT32_create(Common::String driverFilename) { + byte *driverData = NULL; + uint16 driverDataSize = 0; + bool isMusicDrvFile = false; + + MidiDriver_Accolade_readDriver(driverFilename, MT_MT32, driverData, driverDataSize, isMusicDrvFile); + if (!driverData) + error("ACCOLADE-ADLIB: error during readDriver()"); + + MidiDriver_Accolade_MT32 *driver = new MidiDriver_Accolade_MT32(); + if (driver) { + if (!driver->setupInstruments(driverData, driverDataSize, isMusicDrvFile)) { + delete driver; + driver = nullptr; + } + } + + delete[] driverData; + return driver; +} + +} // End of namespace AGOS |