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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001-2005 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.
*
* $Header$
*/
#ifdef MACOSX
#include "common/stdafx.h"
#include "common/config-manager.h"
#include "common/util.h"
#include "sound/mpu401.h"
#include <AudioUnit/AudioUnit.h>
// Activating the following switch disables reverb support in the CoreAudio
// midi backend. Reverb will suck away a *lot* of CPU time, so on slower
// systems, you may want to turn it off completely.
// TODO: Maybe make this a config option?
//#define COREAUDIO_DISABLE_REVERB
/*
See here to see how to react to a change of the default output unit:
http://cvs.opendarwin.org/cgi-bin/cvsweb.cgi/proj/KDE-Darwin/arts/flow/audioiocoreaudio.cc?rev=HEAD&content-type=text/x-cvsweb-markup
*/
/* CoreAudio MIDI driver
* Based on code by Benjamin W. Zale
* Extended by Max Horn
*/
class MidiDriver_CORE : public MidiDriver_MPU401 {
public:
MidiDriver_CORE();
int open();
void close();
void send(uint32 b);
void sysEx(byte *msg, uint16 length);
private:
AudioUnit au_MusicDevice;
AudioUnit au_output;
};
MidiDriver_CORE::MidiDriver_CORE()
: au_MusicDevice(0), au_output(0) {
}
int MidiDriver_CORE::open() {
if (au_output)
return MERR_ALREADY_OPEN;
AudioUnitConnection auconnect;
ComponentDescription compdesc;
Component compid;
OSErr err;
// Open the Music Device.
// We use the AudioUnit v1 API, even though it is deprecated, because
// this way we stay compatible with older OS X versions.
// For v2, we'd use kAudioUnitType_MusicDevice and kAudioUnitSubType_DLSSynth
compdesc.componentType = kAudioUnitComponentType;
compdesc.componentSubType = kAudioUnitSubType_MusicDevice;
compdesc.componentManufacturer = kAudioUnitID_DLSSynth;
compdesc.componentFlags = 0;
compdesc.componentFlagsMask = 0;
compid = FindNextComponent(NULL, &compdesc);
au_MusicDevice = static_cast<AudioUnit>(OpenComponent(compid));
if (au_MusicDevice == 0)
error("Failed opening CoreAudio music device");
// Load custom soundfont, if specified
// FIXME: This is kind of a temporary hack. Better (IMO) would be to
// query QuickTime for whatever custom soundfont was set in the
// QuickTime Preferences, and use that automatically.
if (ConfMan.hasKey("soundfont")) {
FSRef fsref;
FSSpec fsSpec;
const char *soundfont = ConfMan.get("soundfont").c_str();
err = FSPathMakeRef ((const byte *)soundfont, &fsref, NULL);
if (err == noErr) {
err = FSGetCatalogInfo (&fsref, kFSCatInfoNone, NULL, NULL, &fsSpec, NULL);
}
if (err == noErr) {
err = AudioUnitSetProperty (
au_MusicDevice,
kMusicDeviceProperty_SoundBankFSSpec, kAudioUnitScope_Global,
0,
&fsSpec, sizeof(fsSpec)
);
}
if (err != noErr)
warning("Failed loading custom sound font '%s' (error %d)\n", soundfont, err);
}
// open the output unit
au_output = (AudioUnit) OpenDefaultComponent(kAudioUnitComponentType, kAudioUnitSubType_Output);
if (au_output == 0)
error("Failed opening output audio unit");
// 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));
#ifdef COREAUDIO_DISABLE_REVERB
UInt32 usesReverb = 0;
AudioUnitSetProperty (au_MusicDevice, kMusicDeviceProperty_UsesInternalReverb,
kAudioUnitScope_Global, 0, &usesReverb, sizeof (usesReverb));
#endif
// 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);
au_output = 0;
CloseComponent(au_MusicDevice);
au_MusicDevice = 0;
}
void MidiDriver_CORE::send(uint32 b) {
assert(au_output != NULL);
assert(au_MusicDevice != NULL);
byte status_byte = (b & 0x000000FF);
byte first_byte = (b & 0x0000FF00) >> 8;
byte second_byte = (b & 0x00FF0000) >> 16;
MusicDeviceMIDIEvent(au_MusicDevice, status_byte, first_byte, second_byte, 0);
}
void MidiDriver_CORE::sysEx(byte *msg, uint16 length) {
assert(au_output != NULL);
assert(au_MusicDevice != NULL);
// Add SysEx frame if missing
byte *buf = 0;
if (*msg != 0xF0) {
buf = (byte *)malloc(length + 2);
buf[0] = 0xF0;
memcpy(buf+1, msg, length);
buf[length+1] = 0xF7;
msg = buf;
length += 2;
}
MusicDeviceSysEx(au_MusicDevice, msg, length);
free(buf);
}
MidiDriver *MidiDriver_CORE_create() {
return new MidiDriver_CORE();
}
#endif // MACOSX
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