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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.
*
*/
#include "sherlock/sherlock.h"
#include "sherlock/scalpel/drivers/mididriver.h"
#include "common/config-manager.h"
#include "common/file.h"
#include "common/system.h"
#include "common/textconsole.h"
//#include "audio/mididrv.h"
namespace Sherlock {
#define SHERLOCK_MT32_CHANNEL_COUNT 16
const byte mt32_reverbDataSysEx[] = {
0x10, 0x00, 0x01, 0x01, 0x05, 0x05, 0xFF
};
class MidiDriver_MT32 : public MidiDriver {
public:
MidiDriver_MT32() {
_driver = NULL;
_isOpen = false;
_MT32 = false;
_nativeMT32 = false;
_baseFreq = 250;
memset(_MIDIchannelActive, 1, sizeof(_MIDIchannelActive));
}
virtual ~MidiDriver_MT32();
// MidiDriver
int open();
void close();
bool isOpen() const { return _isOpen; }
void send(uint32 b);
void newMusicData(byte *musicData, int32 musicDataSize);
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 _MT32;
bool _nativeMT32;
bool _isOpen;
int _baseFreq;
private:
// points to a MIDI channel for each of the new voice channels
byte _MIDIchannelActive[SHERLOCK_MT32_CHANNEL_COUNT];
public:
void uploadMT32Patches(byte *driverData, int32 driverSize);
void MT32SysEx(const byte *&dataPtr, int32 &bytesLeft);
};
MidiDriver_MT32::~MidiDriver_MT32() {
Common::StackLock lock(_mutex);
if (_driver) {
_driver->setTimerCallback(0, 0);
_driver->close();
delete _driver;
}
_driver = NULL;
}
int MidiDriver_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);
switch (musicType) {
case MT_MT32:
_MT32 = true;
_nativeMT32 = false;
break;
case MT_GM:
if (ConfMan.getBool("native_mt32")) {
_MT32 = true;
_nativeMT32 = true;
}
break;
default:
break;
}
_driver = MidiDriver::createMidi(dev);
if (!_driver)
return 255;
if (_nativeMT32)
_driver->property(MidiDriver::PROP_CHANNEL_MASK, 0x03FE);
int ret = _driver->open();
if (ret)
return ret;
if (_MT32)
_driver->sendMT32Reset();
else
_driver->sendGMReset();
return 0;
}
void MidiDriver_MT32::close() {
if (_driver) {
_driver->close();
}
}
// Called when a music track got loaded into memory
void MidiDriver_MT32::newMusicData(byte *musicData, int32 musicDataSize) {
assert(musicDataSize >= 0x7F); // Security check
// MIDI Channel Enable/Disable bytes at offset 0x2 of music data
memcpy(&_MIDIchannelActive, musicData + 0x2, SHERLOCK_MT32_CHANNEL_COUNT);
// Send 16 bytes from offset 0x12 to MT32
// All the music tracks of Sherlock seem to contain dummy data
// probably a feature, that was used in the game "Ski or Die"
// that's why we don't implement this
// Also send these bytes to MT32 (SysEx) - seems to be reverb configuration
if (_MT32) {
const byte *reverbData = mt32_reverbDataSysEx;
int32 reverbDataSize = sizeof(mt32_reverbDataSysEx);
MT32SysEx(reverbData, reverbDataSize);
}
}
void MidiDriver_MT32::uploadMT32Patches(byte *driverData, int32 driverSize) {
if (!_driver)
return;
if (!_MT32)
return;
// patch data starts at offset 0x863
assert(driverSize == 0x13B9); // Security check
assert(driverData[0x863] == 0x7F); // another security check
const byte *patchPtr = driverData + 0x863;
int32 bytesLeft = driverSize - 0x863;
while(1) {
MT32SysEx(patchPtr, bytesLeft);
assert(bytesLeft);
if (*patchPtr == 0x80) // List terminator
break;
}
}
void MidiDriver_MT32::MT32SysEx(const byte *&dataPtr, int32 &bytesLeft) {
byte sysExMessage[270];
uint16 sysExPos = 0;
byte sysExByte = 0;
uint16 sysExChecksum = 0;
memset(&sysExMessage, 0, sizeof(sysExMessage));
sysExMessage[0] = 0x41; // Roland
sysExMessage[1] = 0x10;
sysExMessage[2] = 0x16; // Model MT32
sysExMessage[3] = 0x12; // Command DT1
sysExPos = 4;
sysExChecksum = 0;
while (1) {
assert(bytesLeft);
sysExByte = *dataPtr++;
bytesLeft--;
if (sysExByte == 0xff)
break; // Message done
assert(sysExPos < sizeof(sysExMessage));
sysExMessage[sysExPos++] = sysExByte;
sysExChecksum -= sysExByte;
}
// Calculate checksum
assert(sysExPos < sizeof(sysExMessage));
sysExMessage[sysExPos++] = sysExChecksum & 0x7f;
debugC(kDebugLevelMT32Driver, "MT32: uploading patch data, size %d", sysExPos);
// Send SysEx
_driver->sysEx(sysExMessage, sysExPos);
// Wait the time it takes to send the SysEx data
uint32 delay = (sysExPos + 2) * 1000 / 3125;
// Plus an additional delay for the MT-32 rev00
if (_nativeMT32)
delay += 40;
g_system->delayMillis(delay);
}
// MIDI messages can be found at http://www.midi.org/techspecs/midimessages.php
void MidiDriver_MT32::send(uint32 b) {
byte command = b & 0xf0;
byte channel = b & 0xf;
if (command == 0xF0) {
if (_driver) {
_driver->send(b);
}
return;
}
if (_MIDIchannelActive[channel]) {
// Only forward MIDI-data in case the channel is currently enabled via music-data
if (_driver) {
_driver->send(b);
}
}
}
MidiDriver *MidiDriver_MT32_create() {
return new MidiDriver_MT32();
}
void MidiDriver_MT32_newMusicData(MidiDriver *driver, byte *musicData, int32 musicDataSize) {
static_cast<MidiDriver_MT32 *>(driver)->newMusicData(musicData, musicDataSize);
}
void MidiDriver_MT32_uploadPatches(MidiDriver *driver, byte *driverData, int32 driverSize) {
static_cast<MidiDriver_MT32 *>(driver)->uploadMT32Patches(driverData, driverSize);
}
} // End of namespace Sci
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