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coreaudio.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001-2004 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: /cvsroot/scummvm/scummvm/backends/midi/coreaudio.cpp,v 1.9 2004/01/06 12:45:27 fingolfin Exp $
 */

#ifdef MACOSX

#include "stdafx.h"
#include "common/config-manager.h"
#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;

      OSStatus err;
      AudioUnitConnection auconnect;

      // Open the Music Device
      au_MusicDevice = (AudioUnit) OpenDefaultComponent(kAudioUnitComponentType, kAudioUnitSubType_MusicDevice);
      
      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);

      // 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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