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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001-2006 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.
*
* $URL$
* $Id$
*/
#ifdef MACOSX
#include "common/stdafx.h"
#include "common/config-manager.h"
#include "common/util.h"
#include "sound/mpu401.h"
#include <AudioToolbox/AUGraph.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
// A macro to simplify error handling a bit.
#define RequireNoErr(error) \
do { \
err = error; \
if (err != noErr) \
goto bail; \
} while (false)
/* CoreAudio MIDI driver
* By Max Horn / Fingolfin
* Based on code by Benjamin W. Zale
*/
class MidiDriver_CORE : public MidiDriver_MPU401 {
public:
MidiDriver_CORE();
int open();
void close();
void send(uint32 b);
void sysEx(const byte *msg, uint16 length);
private:
AUGraph _auGraph;
AudioUnit _synth;
};
MidiDriver_CORE::MidiDriver_CORE()
: _auGraph(0) {
}
int MidiDriver_CORE::open() {
OSStatus err = 0;
if (_auGraph)
return MERR_ALREADY_OPEN;
// 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
RequireNoErr(NewAUGraph(&_auGraph));
AUNode outputNode, synthNode;
ComponentDescription desc;
// The default output device
desc.componentType = kAudioUnitComponentType;
desc.componentSubType = kAudioUnitSubType_Output;
desc.componentManufacturer = kAudioUnitID_DefaultOutput;
desc.componentFlags = 0;
desc.componentFlagsMask = 0;
RequireNoErr(AUGraphNewNode(_auGraph, &desc, 0, NULL, &outputNode));
// The built-in default (softsynth) music device
desc.componentSubType = kAudioUnitSubType_MusicDevice;
desc.componentManufacturer = kAudioUnitID_DLSSynth;
RequireNoErr(AUGraphNewNode(_auGraph, &desc, 0, NULL, &synthNode));
// Connect the softsynth to the default output
RequireNoErr(AUGraphConnectNodeInput(_auGraph, synthNode, 0, outputNode, 0));
// Open and initialize the whole graph
RequireNoErr(AUGraphOpen(_auGraph));
RequireNoErr(AUGraphInitialize(_auGraph));
// Get the music device from the graph.
RequireNoErr(AUGraphGetNodeInfo(_auGraph, synthNode, NULL, NULL, NULL, &_synth));
// Load custom soundfont, if specified
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) {
// TODO: We should really check here whether the file contains an
// actual soundfont...
err = AudioUnitSetProperty (
_synth,
kMusicDeviceProperty_SoundBankFSSpec, kAudioUnitScope_Global,
0,
&fsSpec, sizeof(fsSpec)
);
}
if (err != noErr)
warning("Failed loading custom sound font '%s' (error %ld)\n", soundfont, err);
}
#ifdef COREAUDIO_DISABLE_REVERB
// Disable reverb mode, as that sucks up a lot of CPU power, which can
// be painful on low end machines.
// TODO: Make this customizable via a config key?
UInt32 usesReverb = 0;
AudioUnitSetProperty (_synth, kMusicDeviceProperty_UsesInternalReverb,
kAudioUnitScope_Global, 0, &usesReverb, sizeof (usesReverb));
#endif
// Finally: Start the graph!
RequireNoErr(AUGraphStart(_auGraph));
return 0;
bail:
if (_auGraph) {
AUGraphStop(_auGraph);
DisposeAUGraph(_auGraph);
_auGraph = 0;
}
return MERR_CANNOT_CONNECT;
}
void MidiDriver_CORE::close() {
MidiDriver_MPU401::close();
if (_auGraph) {
AUGraphStop(_auGraph);
DisposeAUGraph(_auGraph);
_auGraph = 0;
}
}
void MidiDriver_CORE::send(uint32 b) {
assert(_auGraph != NULL);
byte status_byte = (b & 0x000000FF);
byte first_byte = (b & 0x0000FF00) >> 8;
byte second_byte = (b & 0x00FF0000) >> 16;
MusicDeviceMIDIEvent(_synth, status_byte, first_byte, second_byte, 0);
}
void MidiDriver_CORE::sysEx(const byte *msg, uint16 length) {
unsigned char buf[256];
assert(length + 2 <= 256);
assert(_auGraph != NULL);
// Add SysEx frame
buf[0] = 0xF0;
memcpy(buf + 1, msg, length);
buf[length + 1] = 0xF7;
// Send it
MusicDeviceSysEx(_synth, buf, length+2);
}
MidiDriver *MidiDriver_CORE_create() {
return new MidiDriver_CORE();
}
#endif // MACOSX
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