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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/>.
*
*/
#include "gmchannel.h"
#include "common/util.h"
#include "common/textconsole.h"
#include "audio/mididrv.h"
namespace Sky {
GmChannel::GmChannel(uint8 *pMusicData, uint16 startOfData, MidiDriver *pMidiDrv, const byte *pInstMap, const byte *veloTab) {
_musicData = pMusicData;
_midiDrv = pMidiDrv;
_channelData.midiChannelNumber = 0;
_channelData.loopPoint = startOfData;
_channelData.eventDataPtr = startOfData;
_channelData.channelActive = true;
_channelData.nextEventTime = getNextEventTime();
_instMap = pInstMap;
_veloTab = veloTab;
_musicVolume = 0x7F;
_currentChannelVolume = 0x7F;
}
GmChannel::~GmChannel() {
stopNote();
}
bool GmChannel::isActive() {
return _channelData.channelActive;
}
void GmChannel::updateVolume(uint16 pVolume) {
_musicVolume = pVolume;
if (_musicVolume > 0)
_musicVolume = (_musicVolume * 2) / 3 + 43;
uint8 newVol = (_currentChannelVolume * _musicVolume) >> 7;
_midiDrv->send((0xB0 | _channelData.midiChannelNumber) | 0x700 | (newVol << 16));
}
void GmChannel::stopNote() {
// All Notes Off
_midiDrv->send((0xB0 | _channelData.midiChannelNumber) | 0x7B00 | 0 | 0x79000000);
// Reset the Pitch Wheel. See bug #1742.
_midiDrv->send((0xE0 | _channelData.midiChannelNumber) | 0x400000);
}
int32 GmChannel::getNextEventTime() {
int32 retV = 0;
uint8 cnt, lVal = 0;
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 GmChannel::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_loopMusic(); break;
case 9: com90_keyOff(); break;
case 11: com90_getChannelPanValue(); break;
case 12: com90_setLoopPoint(); break;
case 13: com90_getChannelControl(); break;
default:
error("GmChannel: Unknown music opcode 0x%02X", opcode);
break;
}
} else {
// new midi channel assignment
_channelData.midiChannelNumber = opcode&0xF;
}
} else {
_channelData.note = opcode;
byte velocity = _musicData[_channelData.eventDataPtr];
if (_veloTab)
velocity = _veloTab[velocity];
_channelData.eventDataPtr++;
_midiDrv->send((0x90 | _channelData.midiChannelNumber) | (opcode << 8) | (velocity << 16));
}
if (_channelData.channelActive)
_channelData.nextEventTime += getNextEventTime();
}
return returnVal;
}
//- command 90h routines
void GmChannel::com90_caseNoteOff() {
_midiDrv->send((0x90 | _channelData.midiChannelNumber) | (_musicData[_channelData.eventDataPtr] << 8));
_channelData.eventDataPtr++;
}
void GmChannel::com90_stopChannel() {
stopNote();
_channelData.channelActive = false;
}
void GmChannel::com90_setupInstrument() {
byte instrument = _musicData[_channelData.eventDataPtr];
if (_instMap)
instrument = _instMap[instrument];
_midiDrv->send((0xC0 | _channelData.midiChannelNumber) | (instrument << 8));
_channelData.eventDataPtr++;
}
uint8 GmChannel::com90_updateTempo() {
return _musicData[_channelData.eventDataPtr++];
}
void GmChannel::com90_getPitch() {
_midiDrv->send((0xE0 | _channelData.midiChannelNumber) | 0 | (_musicData[_channelData.eventDataPtr] << 16));
_channelData.eventDataPtr++;
}
void GmChannel::com90_getChannelVolume() {
_currentChannelVolume = _musicData[_channelData.eventDataPtr++];
uint8 newVol = (uint8)((_currentChannelVolume * _musicVolume) >> 7);
_midiDrv->send((0xB0 | _channelData.midiChannelNumber) | 0x700 | (newVol << 16));
}
void GmChannel::com90_loopMusic() {
_channelData.eventDataPtr = _channelData.loopPoint;
}
void GmChannel::com90_keyOff() {
_midiDrv->send((0x90 | _channelData.midiChannelNumber) | (_channelData.note << 8) | 0);
}
void GmChannel::com90_setLoopPoint() {
_channelData.loopPoint = _channelData.eventDataPtr;
}
void GmChannel::com90_getChannelPanValue() {
_midiDrv->send((0xB0 | _channelData.midiChannelNumber) | 0x0A00 | (_musicData[_channelData.eventDataPtr] << 16));
_channelData.eventDataPtr++;
}
void GmChannel::com90_getChannelControl() {
uint8 conNum = _musicData[_channelData.eventDataPtr++];
uint8 conDat = _musicData[_channelData.eventDataPtr++];
_midiDrv->send((0xB0 | _channelData.midiChannelNumber) | (conNum << 8) | (conDat << 16));
}
} // End of namespace Sky
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