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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 "sky/music/mt32music.h"
void SkyMT32Music::passTimerFunc(void *param) {
((SkyMT32Music*)param)->timerCall();
}
SkyMT32Music::SkyMT32Music(MidiDriver *pMidiDrv, SkyDisk *pSkyDisk, OSystem *system)
: SkyMusicBase(pSkyDisk, system) {
_driverFileBase = 60200;
_midiDrv = pMidiDrv;
int midiRes = _midiDrv->open();
if (midiRes != 0) {
error("Can't open midi device. Errorcode: %d",midiRes);
}
_midiDrv->setTimerCallback(this, passTimerFunc);
_ignoreNextPoll = false;
for (uint8 cnt = 0; cnt < 128; cnt++)
_dummyMap[cnt] = cnt;
}
SkyMT32Music::~SkyMT32Music(void) {
_midiDrv->close();
_midiDrv->setTimerCallback(NULL, NULL);
delete _midiDrv;
}
void SkyMT32Music::timerCall(void) {
// midi driver polls hundred times per sec. We only want 50 times.
_ignoreNextPoll = !_ignoreNextPoll;
if (!_ignoreNextPoll) return;
if (_musicData != NULL)
pollMusic();
}
void SkyMT32Music::setVolume(uint8 volume) {
uint8 sysEx[6];
_musicVolume = volume;
sysEx[0] = 0x7F; sysEx[1] = 0x7F; sysEx[2] = 0x04; sysEx[3] = 0x01;
sysEx[4] = 0; sysEx[5] = volume & 0x7F;
_midiDrv->sysEx(sysEx, 6);
}
void SkyMT32Music::setupPointers(void) {
_musicDataLoc = (_musicData[0x7DD] << 8) | _musicData[0x7DC];
_sysExSequence = ((_musicData[0x7E1] << 8) | _musicData[0x7E0]) + _musicData;
}
void SkyMT32Music::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 SkyGmChannel(_musicData, chDataStart, _midiDrv, _dummyMap, _dummyMap);
}
}
#define MIDI_PACK(a,b,c,d) ((a) | ((b) << 8) | ((c) << 16) | ((d) << 24))
bool SkyMT32Music::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; // crc
_midiDrv->sysEx(sysExBuf, 15);
return true;
}
void SkyMT32Music::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);
}
while (processPatchSysEx(sysExData))
sysExData += 5;
}
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