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coremidi.cpp

/* 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: https://svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-9-1/backends/midi/coremidi.cpp $
 * $Id: coremidi.cpp 20952 2006-02-27 01:59:07Z Jamieson630 $
 */

#ifdef MACOSX

#include "common/stdafx.h"
#include "common/config-manager.h"
#include "common/util.h"
#include "sound/mpu401.h"

#include <CoreMIDI/CoreMIDI.h>



/*
For information on how to unify the CoreMidi and MusicDevice code:

http://lists.apple.com/archives/Coreaudio-api/2005/Jun/msg00194.html
http://lists.apple.com/archives/coreaudio-api/2003/Mar/msg00248.html
http://lists.apple.com/archives/coreaudio-api/2003/Jul/msg00137.html

*/


/* CoreMIDI MIDI driver
 * By Max Horn
 */
class MidiDriver_CoreMIDI : public MidiDriver_MPU401 {
public:
      MidiDriver_CoreMIDI();
      ~MidiDriver_CoreMIDI();
      int open();
      void close();
      void send(uint32 b);
      void sysEx(const byte *msg, uint16 length);

private:
      MIDIClientRef     mClient;
      MIDIPortRef       mOutPort;
      MIDIEndpointRef   mDest;
};

MidiDriver_CoreMIDI::MidiDriver_CoreMIDI()
      : mClient(0), mOutPort(0), mDest(0) {

      OSStatus err;
      err = MIDIClientCreate(CFSTR("ScummVM MIDI Driver for OS X"), NULL, NULL, &mClient);
}

MidiDriver_CoreMIDI::~MidiDriver_CoreMIDI() {
      if (mClient)
            MIDIClientDispose(mClient);
      mClient = 0;
}

int MidiDriver_CoreMIDI::open() {
      if (mDest)
            return MERR_ALREADY_OPEN;

      OSStatus err = noErr;

      mOutPort = 0;

      int dests = MIDIGetNumberOfDestinations();
      if (dests > 0 && mClient) {
            mDest = MIDIGetDestination(0);
            err = MIDIOutputPortCreate( mClient,
                                                      CFSTR("scummvm_output_port"),
                                                      &mOutPort);
      } else {
            return MERR_DEVICE_NOT_AVAILABLE;
      }
      
      if (err != noErr) 
            return MERR_CANNOT_CONNECT;

      return 0;
}

void MidiDriver_CoreMIDI::close() {
      MidiDriver_MPU401::close();

      if (mOutPort && mDest) {
            MIDIPortDispose(mOutPort);
            mOutPort = 0;
            mDest = 0;
      }
}

void MidiDriver_CoreMIDI::send(uint32 b) {
      assert(mOutPort != NULL);
      assert(mDest != NULL);

      // Extract the MIDI data
      byte status_byte = (b & 0x000000FF);
      byte first_byte = (b & 0x0000FF00) >> 8;
      byte second_byte = (b & 0x00FF0000) >> 16;

      // Generate a single MIDI packet with that data
      MIDIPacketList packetList;
      MIDIPacket *packet = &packetList.packet[0];

      packetList.numPackets = 1;

      packet->timeStamp = 0;
      packet->data[0] = status_byte;
      packet->data[1] = first_byte;
      packet->data[2] = second_byte;

      // Compute the correct length of the MIDI command. This is important,
      // else things may screw up badly...
      switch (status_byte & 0xF0) {
      case 0x80:  // Note Off
      case 0x90:  // Note On
      case 0xA0:  // Polyphonic Aftertouch
      case 0xB0:  // Controller Change
      case 0xE0:  // Pitch Bending
            packet->length = 3;
            break;
      case 0xC0:  // Programm Change
      case 0xD0:  // Monophonic Aftertouch
            packet->length = 2;
            break;
      default:
            warning("CoreMIDI driver encountered unsupported status byte: 0x%02x", status_byte);
            packet->length = 3;
            break;
      }

      // Finally send it out to the synthesizer.
      MIDISend(mOutPort, mDest, &packetList);
}

void MidiDriver_CoreMIDI::sysEx(const byte *msg, uint16 length) {
      assert(mOutPort != NULL);
      assert(mDest != NULL);

      byte buf[384];
      MIDIPacketList *packetList = (MIDIPacketList *)buf;
      MIDIPacket *packet = packetList->packet;

      assert(sizeof(buf) >= sizeof(UInt32) + sizeof(MIDITimeStamp) + sizeof(UInt16) + length + 2);

      packetList->numPackets = 1;

      packet->timeStamp = 0;

      // Add SysEx frame if missing
      if (*msg != 0xF0) {
            packet->length = length + 2;
            packet->data[0] = 0xF0;
            memcpy(packet->data + 1, msg, length);
            packet->data[length + 1] = 0xF7;
      } else {
            packet->length = length;
            memcpy(packet->data, msg, length);
      }

      MIDISend(mOutPort, mDest, packetList);
}

MidiDriver *MidiDriver_CoreMIDI_create() {
      return new MidiDriver_CoreMIDI();
}

#endif // MACOSX

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