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/* ScummVM - Scumm Interpreter
* Copyright (C) 2003-2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#include "sky/music/mt32music.h"
#include "sky/music/gmchannel.h"
#include "common/util.h"
#include "common/system.h"
#include "sound/mididrv.h"
namespace Sky {
void MT32Music::passTimerFunc(void *param) {
((MT32Music*)param)->timerCall();
}
MT32Music::MT32Music(MidiDriver *pMidiDrv, Disk *pDisk)
: MusicBase(pDisk) {
_driverFileBase = 60200;
_midiDrv = pMidiDrv;
int midiRes = _midiDrv->open();
if (midiRes != 0)
error("Can't open midi device. Errorcode: %d",midiRes);
_timerCount = 0;
_midiDrv->setTimerCallback(this, passTimerFunc);
}
MT32Music::~MT32Music(void) {
_midiDrv->close();
_midiDrv->setTimerCallback(NULL, NULL);
delete _midiDrv;
}
void MT32Music::timerCall(void) {
_timerCount += _midiDrv->getBaseTempo();
if (_timerCount > (1000000 / 50)) {
// call pollMusic() 50 times per second
_timerCount -= 1000000 / 50;
if (_musicData != NULL)
pollMusic();
}
}
void MT32Music::setVolume(uint8 volume) {
uint8 sysEx[10] = "\x41\x10\x16\x12\x10\x00\x16\x00\x00";
_musicVolume = volume;
sysEx[7] = (volume > 100) ? 100 : volume;
sysEx[8] = 0x00;
for (uint8 cnt = 4; cnt < 8; cnt++)
sysEx[8] -= sysEx[cnt];
sysEx[8] &= 0x7F;
_midiDrv->sysEx(sysEx, 9);
}
void MT32Music::setupPointers(void) {
_musicDataLoc = (_musicData[0x7DD] << 8) | _musicData[0x7DC];
_sysExSequence = ((_musicData[0x7E1] << 8) | _musicData[0x7E0]) + _musicData;
}
void MT32Music::setupChannels(uint8 *channelData) {
_numberOfChannels = channelData[0];
channelData++;
for (uint8 cnt = 0; cnt < _numberOfChannels; cnt++) {
uint16 chDataStart = ((channelData[(cnt << 1) | 1] << 8) | channelData[cnt << 1]) + _musicDataLoc;
_channels[cnt] = new GmChannel(_musicData, chDataStart, _midiDrv, NULL, NULL);
_channels[cnt]->updateVolume(_musicVolume);
}
}
bool MT32Music::processPatchSysEx(uint8 *sysExData) {
uint8 sysExBuf[15];
uint8 crc = 0;
if (sysExData[0] & 0x80)
return false;
// decompress data from stream
sysExBuf[0] = 0x41; sysExBuf[1] = 0x10; sysExBuf[2] = 0x16; sysExBuf[3] = 0x12; sysExBuf[4] = 0x5;
sysExBuf[5] = sysExData[0] >> 4; // patch offset part 1
sysExBuf[6] = (sysExData[0] & 0xF) << 3; // patch offset part 2
sysExBuf[7] = sysExData[1] >> 6; // timbre group
sysExBuf[8] = sysExData[1] & 0x3F; // timbre num
sysExBuf[9] = sysExData[2] & 0x3F; // key shift
sysExBuf[10] = sysExData[3] & 0x7F; // fine tune
sysExBuf[11] = sysExData[4] & 0x7F; // bender range
sysExBuf[12] = sysExData[2] >> 6; // assign mode
sysExBuf[13] = sysExData[3] >> 7; // reverb switch
for (uint8 cnt = 4; cnt < 14; cnt++)
crc -= sysExBuf[cnt];
sysExBuf[14] = crc & 0x7F; // crc
_midiDrv->sysEx(sysExBuf, 15);
g_system->delayMillis(5);
return true;
}
void MT32Music::startDriver(void) {
// setup timbres and patches using SysEx data
uint8* sysExData = _sysExSequence;
uint8 timbreNum = sysExData[0];
uint8 cnt, crc;
sysExData++;
uint8 sendBuf[256];
uint8 len;
sendBuf[0] = 0x41; sendBuf[1] = 0x10; sendBuf[2] = 0x16; sendBuf[3] = 0x12;
for (cnt = 0; cnt < timbreNum; cnt++) {
len = 7;
crc = 0;
// Timbre address
sendBuf[4] = 0x8 | (sysExData[0] >> 6);
sendBuf[5] = (sysExData[0] & 0x3F) << 1;
sendBuf[6] = 0xA;
sysExData++;
crc -= sendBuf[4] + sendBuf[5] + sendBuf[6];
uint8 dataLen = sysExData[0];
sysExData++;
// Timbre data:
do {
uint8 rlVal = 1;
uint8 codeVal = sysExData[0];
sysExData++;
if (codeVal & 0x80) {
codeVal &= 0x7F;
rlVal = sysExData[0];
sysExData++;
dataLen--;
}
for (uint8 cnt2 = 0; cnt2 < rlVal; cnt2++) {
sendBuf[len] = codeVal;
len++;
crc -= codeVal;
}
dataLen--;
} while (dataLen > 0);
sendBuf[len] = crc & 0x7F;
len++;
_midiDrv->sysEx(sendBuf, len);
g_system->delayMillis (5);
}
while (processPatchSysEx(sysExData))
sysExData += 5;
}
} // End of namespace Sky
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