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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001-2004 The ScummVM project
*
* YM2612 tone generation code written by Tomoaki Hayasaka.
* Used under the terms of the GNU General Public License.
* Adpated to ScummVM by Jamieson Christian.
*
* 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 "backends/midi/emumidi.h"
#include "common/util.h"
#include "common/file.h"
#include "backends/midi/mt32/synth.h"
class MidiDriver_MT32 : public MidiDriver_Emulated {
private:
CSynthMT32 *_synth;
int _outputRate;
protected:
void generate_samples(int16 *buf, int len);
public:
MidiDriver_MT32(SoundMixer *mixer, const char *path);
virtual ~MidiDriver_MT32();
int open();
void close();
void send(uint32 b);
uint32 property(int prop, uint32 param) { return 0; }
void setPitchBendRange(byte channel, uint range) { }
void sysEx(byte *msg, uint16 length);
MidiChannel *allocateChannel() { return 0; }
MidiChannel *getPercussionChannel() { return 0; }
// AudioStream API
bool isStereo() const { return true; }
int getRate() const { return _outputRate; }
};
////////////////////////////////////////
//
// MidiDriver_MT32
//
////////////////////////////////////////
MidiDriver_MT32::MidiDriver_MT32(SoundMixer *mixer, const char *path)
: MidiDriver_Emulated(mixer) {
File fp;
_synth = new CSynthMT32();
File::addDefaultDirectory(path);
_baseFreq = 1000;
fp.open("waveforms.raw");
if(!fp.isOpen()) {
error("Unable to open waveforms.raw");
}
switch(fp.size()) {
case 1410000:
_outputRate = 32000;
break;
case 1944040:
_outputRate = 44100;
break;
default:
error("MT-32: Unknown waveforms.raw file sample rate");
}
fp.close();
}
MidiDriver_MT32::~MidiDriver_MT32() {
delete _synth;
}
int MidiDriver_MT32::open() {
SynthProperties prop;
if (_isOpen)
return MERR_ALREADY_OPEN;
MidiDriver_Emulated::open();
prop.SampleRate = getRate(); // 32000;
prop.UseReverb = true;
prop.UseDefault = true;
//prop.RevType = 0;
//prop.RevTime = 5;
//prop.RevLevel = 3;
_synth->ClassicOpen(prop);
_mixer->setupPremix(this);
return 0;
}
void MidiDriver_MT32::send(uint32 b) {
_synth->PlayMsg(b);
}
void MidiDriver_MT32::sysEx(byte *msg, uint16 length) {
_synth->PlaySysex(msg, length);
}
void MidiDriver_MT32::close() {
if (!_isOpen)
return;
_isOpen = false;
// Detach the premix callback handler
_mixer->setupPremix(0);
_synth->Close();
}
void MidiDriver_MT32::generate_samples(int16 *data, int len) {
_synth->MT32_CallBack((uint8 *)data, len, _mixer->getMusicVolume());
}
////////////////////////////////////////
//
// MidiDriver_MT32 factory
//
////////////////////////////////////////
MidiDriver *MidiDriver_MT32_create(SoundMixer *mixer, const char *path) {
return new MidiDriver_MT32(mixer, path);
}
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