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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 "sky/music/mt32music.h"
#include "sky/music/gmchannel.h"
#include "common/util.h"
#include "common/system.h"
#include "common/endian.h"
#include "common/textconsole.h"
#include "audio/mididrv.h"
namespace Sky {
void MT32Music::passTimerFunc(void *param) {
((MT32Music *)param)->timerCall();
}
MT32Music::MT32Music(MidiDriver *pMidiDrv, Audio::Mixer *pMixer, Disk *pDisk) : MusicBase(pMixer, 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);
_midiDrv->sendMT32Reset();
}
MT32Music::~MT32Music() {
_midiDrv->close();
_midiDrv->setTimerCallback(NULL, NULL);
delete _midiDrv;
}
void MT32Music::timerCall() {
_timerCount += _midiDrv->getBaseTempo();
if (_timerCount > (1000000 / 50)) {
// call pollMusic() 50 times per second
_timerCount -= 1000000 / 50;
if (_musicData != NULL)
pollMusic();
}
}
void MT32Music::setVolume(uint16 volume) {
uint8 sysEx[10] = "\x41\x10\x16\x12\x10\x00\x16\x00\x00";
_musicVolume = volume;
sysEx[7] = (volume > 100) ? 100 : (uint8)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() {
_musicDataLoc = READ_LE_UINT16(_musicData + 0x7DC);
_sysExSequence = READ_LE_UINT16(_musicData + 0x7E0) + _musicData;
}
void MT32Music::setupChannels(uint8 *channelData) {
_numberOfChannels = channelData[0];
channelData++;
for (uint8 cnt = 0; cnt < _numberOfChannels; cnt++) {
uint16 chDataStart = READ_LE_UINT16((uint16 *)channelData + cnt) + _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);
// We delay the time it takes to send the sysEx plus an
// additional 40ms, which is required for MT-32 rev00,
// to assure no buffer overflow or missing bytes
g_system->delayMillis(17 * 1000 / 3125 + 40);
return true;
}
void MT32Music::startDriver() {
// 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);
// We delay the time it takes to send the sysEx plus an
// additional 40ms, which is required for MT-32 rev00,
// to assure no buffer overflow or missing bytes
g_system->delayMillis((len + 2) * 1000 / 3125 + 40);
}
while (processPatchSysEx(sysExData))
sysExData += 5;
}
} // End of namespace Sky
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