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/* ScummVM - Scumm Interpreter
* Copyright (C) 2003 The ScummVM project
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*
*/
#include "gmchannel.h"
// the MT32 is a lot more sensitive to velocities than most general midi devices,
// so we need to boost them a little
SkyGmChannel::SkyGmChannel(uint8 *pMusicData, uint16 startOfData, MidiDriver *pMidiDrv, byte *pInstMap, uint8 *veloTab)
{
_musicData = pMusicData;
_midiDrv = pMidiDrv;
_channelData.midiChannelNumber = 0;
_channelData.startOfData = startOfData;
_channelData.eventDataPtr = startOfData;
_channelData.channelActive = 1;
_channelData.nextEventTime = getNextEventTime();
_mt32_to_gm = pInstMap;
_veloTab = veloTab;
_musicVolume = 0x100;
}
bool SkyGmChannel::isActive(void) {
return _channelData.channelActive != 0;
}
void SkyGmChannel::updateVolume(uint16 pVolume) {
_musicVolume = pVolume;
}
void SkyGmChannel::stopNote(void) {
_midiDrv->send((0xB0 | _channelData.midiChannelNumber) | 0x7B00 | 0 | 0x79000000);
}
int32 SkyGmChannel::getNextEventTime(void)
{
int32 retV = 0;
uint8 cnt, lVal;
for (cnt = 0; cnt < 4; cnt++) {
lVal = _musicData[_channelData.eventDataPtr];
_channelData.eventDataPtr++;
retV = (retV << 7) | (lVal & 0x7F);
if (!(lVal & 0x80)) break;
}
if (lVal & 0x80) { // should never happen
return -1;
} else return retV;
}
uint8 SkyGmChannel::process(uint16 aktTime) {
if (!_channelData.channelActive)
return 0;
uint8 returnVal = 0;
_channelData.nextEventTime -= aktTime;
uint8 opcode;
while ((_channelData.nextEventTime < 0) && (_channelData.channelActive)) {
opcode = _musicData[_channelData.eventDataPtr];
_channelData.eventDataPtr++;
if (opcode&0x80) {
if (opcode == 0xFF) {
// dummy opcode
} else if (opcode >= 0x90) {
switch (opcode&0xF) {
case 0: com90_caseNoteOff(); break;
case 1: com90_stopChannel(); break;
case 2: com90_setupInstrument(); break;
case 3:
returnVal = com90_updateTempo();
break;
case 5: com90_getPitch(); break;
case 6: com90_getChannelVolume(); break;
case 8: com90_rewindMusic(); break;
case 9: com90_keyOff(); break;
case 11: com90_getChannelPanValue(); break;
case 12: com90_setStartOfData(); break;
case 13: com90_getChannelControl(); break;
case 4: //com90_dummy();
case 7: //com90_skipTremoVibro();
case 10: //com90_error();
error("SkyChannel: dummy music routine 0x%02X was called",opcode);
_channelData.channelActive = 0;
break;
default:
// these opcodes aren't implemented in original music driver
error("SkyChannel: Not existant routine 0x%02X was called",opcode);
_channelData.channelActive = 0;
break;
}
} else {
// new midi channel assignment
_channelData.midiChannelNumber = opcode&0xF;
}
} else {
_channelData.note = opcode;
uint8 velocity = _veloTab[_musicData[_channelData.eventDataPtr]];
_channelData.eventDataPtr++;
_midiDrv->send((0x90 | _channelData.midiChannelNumber) | (opcode << 8) | (velocity << 16));
}
if (_channelData.channelActive)
_channelData.nextEventTime += getNextEventTime();
}
return returnVal;
}
//- command 90h routines
void SkyGmChannel::com90_caseNoteOff(void) {
_midiDrv->send((0x90 | _channelData.midiChannelNumber) | (_musicData[_channelData.eventDataPtr] << 8));
_channelData.eventDataPtr++;
}
void SkyGmChannel::com90_stopChannel(void) {
stopNote();
_channelData.channelActive = 0;
}
void SkyGmChannel::com90_setupInstrument(void) {
_midiDrv->send((0xC0 | _channelData.midiChannelNumber) | (_mt32_to_gm[_musicData[_channelData.eventDataPtr]] << 8));
_channelData.eventDataPtr++;
}
uint8 SkyGmChannel::com90_updateTempo(void) {
uint8 retV = _musicData[_channelData.eventDataPtr];
_channelData.eventDataPtr++;
return retV;
}
void SkyGmChannel::com90_getPitch(void) {
_midiDrv->send((0xE0 | _channelData.midiChannelNumber) | 0 | (_musicData[_channelData.eventDataPtr] << 16));
_channelData.eventDataPtr++;
}
void SkyGmChannel::com90_getChannelVolume(void) {
_midiDrv->send((0xB0 | _channelData.midiChannelNumber) | 0x700 | (_musicData[_channelData.eventDataPtr] << 16));
_channelData.eventDataPtr++;
}
void SkyGmChannel::com90_rewindMusic(void) {
_channelData.eventDataPtr = _channelData.startOfData;
}
void SkyGmChannel::com90_keyOff(void) {
_midiDrv->send((0x90 | _channelData.midiChannelNumber) | (_channelData.note << 8) | 0);
}
void SkyGmChannel::com90_setStartOfData(void) {
_channelData.startOfData = _channelData.eventDataPtr;
}
void SkyGmChannel::com90_getChannelPanValue(void) {
_midiDrv->send((0xB0 | _channelData.midiChannelNumber) | 0x0A00 | (_musicData[_channelData.eventDataPtr] << 16));
_channelData.eventDataPtr++;
}
void SkyGmChannel::com90_getChannelControl(void) {
uint8 conNum = _musicData[_channelData.eventDataPtr];
uint8 conDat = _musicData[_channelData.eventDataPtr + 1];
_channelData.eventDataPtr += 2;
_midiDrv->send((0xB0 | _channelData.midiChannelNumber) | (conNum << 8) | (conDat << 16));
}
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