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seq.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001  Ludvig Strigeus
 * 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/seq.cpp $
 * $Id: seq.cpp 21055 2006-03-04 01:32:04Z sev $
 */

/*
 * Raw output support by Michael Pearce
 * Alsa support by Nicolas Noble <nicolas@nobis-crew.org> copied from
 *    both the QuickTime support and (vkeybd http://www.alsa-project.org/~iwai/alsa.html)
 */

#if defined(UNIX) && !defined(__BEOS__) && !defined(__MAEMO__)

#include "common/stdafx.h"
#include "sound/mpu401.h"
#include "common/util.h"

////////////////////////////////////////
//
// Unix dev/sequencer driver
//
////////////////////////////////////////

#define SEQ_MIDIPUTC 5

class MidiDriver_SEQ : public MidiDriver_MPU401 {
public:
      MidiDriver_SEQ();
      int open();
      void close();
      void send(uint32 b);
      void sysEx(const byte *msg, uint16 length);

private:
      bool _isOpen;
      int device, _device_num;
};

MidiDriver_SEQ::MidiDriver_SEQ() {
      _isOpen = false;
      device = 0;
      _device_num = 0;
}

int MidiDriver_SEQ::open() {
      char *device_name;
      char dev_seq[] = "/dev/sequencer";

      if (_isOpen)
            return MERR_ALREADY_OPEN;
      _isOpen = true;
      device = 0;

      device_name = getenv("SCUMMVM_MIDI");

      if (device_name == NULL) {
            warning("SCUMMVM_MIDI environment variable not set, using /dev/sequencer");
            device_name = dev_seq;
      }

      device = (::open((device_name), O_RDWR, 0));

      if ((device_name == NULL) || (device < 0)) {
            if (device_name == NULL)
                  warning("Opening /dev/null (no music will be heard) ");
            else
                  warning("Cannot open rawmidi device %s - using /dev/null (no music will be heard) ",
                                          device_name);
            device = (::open(("/dev/null"), O_RDWR, 0));
            if (device < 0)
                  error("Cannot open /dev/null to dump midi output");
      }

      if (getenv("SCUMMVM_MIDIPORT"))
            _device_num = atoi(getenv("SCUMMVM_MIDIPORT"));
      return 0;
}

void MidiDriver_SEQ::close() {
      MidiDriver_MPU401::close();
      ::close(device);
      _isOpen = false;
}

void MidiDriver_SEQ::send(uint32 b) {
      unsigned char buf[256];
      int position = 0;

      switch (b & 0xF0) {
      case 0x80:
      case 0x90:
      case 0xA0:
      case 0xB0:
      case 0xE0:
            buf[position++] = SEQ_MIDIPUTC;
            buf[position++] = (unsigned char)b;
            buf[position++] = _device_num;
            buf[position++] = 0;
            buf[position++] = SEQ_MIDIPUTC;
            buf[position++] = (unsigned char)((b >> 8) & 0x7F);
            buf[position++] = _device_num;
            buf[position++] = 0;
            buf[position++] = SEQ_MIDIPUTC;
            buf[position++] = (unsigned char)((b >> 16) & 0x7F);
            buf[position++] = _device_num;
            buf[position++] = 0;
            break;
      case 0xC0:
      case 0xD0:
            buf[position++] = SEQ_MIDIPUTC;
            buf[position++] = (unsigned char)b;
            buf[position++] = _device_num;
            buf[position++] = 0;
            buf[position++] = SEQ_MIDIPUTC;
            buf[position++] = (unsigned char)((b >> 8) & 0x7F);
            buf[position++] = _device_num;
            buf[position++] = 0;
            break;
      default:
            fprintf(stderr, "Unknown : %08x\n", (int)b);
            break;
      }
      write(device, buf, position);
}

void MidiDriver_SEQ::sysEx (const byte *msg, uint16 length) {
      if (length > 254) {
            warning ("Cannot send SysEx block - data too large");
            return;
      }

      unsigned char buf [1024];
      int position = 0;
      const byte *chr = msg;

      buf[position++] = SEQ_MIDIPUTC;
      buf[position++] = 0xF0;
      buf[position++] = _device_num;
      buf[position++] = 0;
      for (; length; --length, ++chr) {
            buf[position++] = SEQ_MIDIPUTC;
            buf[position++] = (unsigned char) *chr & 0x7F;
            buf[position++] = _device_num;
            buf[position++] = 0;
      }
      buf[position++] = SEQ_MIDIPUTC;
      buf[position++] = 0xF7;
      buf[position++] = _device_num;
      buf[position++] = 0;

      write (device, buf, position);
}

MidiDriver *MidiDriver_SEQ_create() {
      return new MidiDriver_SEQ();
}

#endif

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