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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001-2003 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.
*
* $Header$
*/
#ifdef MACOSX
#include "sound/mpu401.h"
#include <AudioUnit/AudioUnit.h>
// FIXME - the following disables reverb support in the QuickTime / CoreAudio
// midi backends. For some reasons, reverb will suck away a *lot* of CPU time.
// Until we know for sure what is causing this and if there is a better way to
// fix the problem, we just disable all reverb for these backends.
#define COREAUDIO_REVERB_HACK
/* CoreAudio MIDI driver
* Based on code by Benjamin W. Zale
* Extended by Max Horn
*/
class MidiDriver_CORE : public MidiDriver_MPU401 {
public:
MidiDriver_CORE() : au_MusicDevice(0), au_output(0) { }
int open();
void close();
void send(uint32 b);
void sysEx(byte *msg, uint16 length);
private:
AudioUnit au_MusicDevice;
AudioUnit au_output;
};
int MidiDriver_CORE::open() {
if (au_output != NULL)
return MERR_ALREADY_OPEN;
int err;
AudioUnitConnection auconnect;
ComponentDescription compdesc;
Component compid;
// Open the Music Device
compdesc.componentType = kAudioUnitComponentType;
compdesc.componentSubType = kAudioUnitSubType_MusicDevice;
compdesc.componentManufacturer = kAudioUnitID_DLSSynth;
compdesc.componentFlags = 0;
compdesc.componentFlagsMask = 0;
compid = FindNextComponent(NULL, &compdesc);
au_MusicDevice = (AudioUnit) OpenComponent(compid);
// open the output unit
au_output = (AudioUnit) OpenDefaultComponent(kAudioUnitComponentType, kAudioUnitSubType_Output);
// connect the units
auconnect.sourceAudioUnit = au_MusicDevice;
auconnect.sourceOutputNumber = 0;
auconnect.destInputNumber = 0;
err =
AudioUnitSetProperty(au_output, kAudioUnitProperty_MakeConnection, kAudioUnitScope_Input, 0,
(void *)&auconnect, sizeof(AudioUnitConnection));
// initialize the units
AudioUnitInitialize(au_MusicDevice);
AudioUnitInitialize(au_output);
// start the output
AudioOutputUnitStart(au_output);
return 0;
}
void MidiDriver_CORE::close() {
MidiDriver_MPU401::close();
// Stop the output
AudioOutputUnitStop(au_output);
// Cleanup
CloseComponent(au_output);
CloseComponent(au_MusicDevice);
}
void MidiDriver_CORE::send(uint32 b) {
unsigned char first_byte, second_byte, status_byte;
status_byte = (b & 0x000000FF);
first_byte = (b & 0x0000FF00) >> 8;
second_byte = (b & 0x00FF0000) >> 16;
#ifdef COREAUDIO_REVERB_HACK
if ((status_byte&0xF0) == 0xB0 && first_byte == 0x5b)
return;
#endif
MusicDeviceMIDIEvent(au_MusicDevice, status_byte, first_byte, second_byte, 0);
}
void MidiDriver_CORE::sysEx(byte *msg, uint16 length) {
MusicDeviceSysEx(au_MusicDevice, msg, length);
}
MidiDriver *MidiDriver_CORE_create() {
return new MidiDriver_CORE();
}
#endif // MACOSX
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