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coreaudio.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-11-1/backends/midi/coreaudio.cpp $
 * $Id: coreaudio.cpp 30944 2008-02-23 22:50:18Z sev $
 */

#ifdef MACOSX

#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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