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windows.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/windows.cpp $
 * $Id: windows.cpp 20952 2006-02-27 01:59:07Z Jamieson630 $
 */

#if defined(WIN32) && !defined(_WIN32_WCE)

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

////////////////////////////////////////
//
// Windows MIDI driver
//
////////////////////////////////////////

class MidiDriver_WIN : public MidiDriver_MPU401 {
private:
      MIDIHDR _streamHeader;
      byte _streamBuffer [258];     // SysEx blocks should be no larger than 256 bytes
      HANDLE _streamEvent;
      HMIDIOUT _mo;
      bool _isOpen;

      void check_error(MMRESULT result);

public:
      MidiDriver_WIN() : _isOpen (false) { }
      int open();
      void close();
      void send(uint32 b);
      void sysEx (const byte *msg, uint16 length);
};

int MidiDriver_WIN::open() {
      if (_isOpen)
            return MERR_ALREADY_OPEN;

      _streamEvent = CreateEvent (NULL, true, true, NULL);
      MMRESULT res = midiOutOpen((HMIDIOUT *)&_mo, MIDI_MAPPER, (unsigned long) _streamEvent, 0, CALLBACK_EVENT);
      if (res != MMSYSERR_NOERROR) {
            check_error(res);
            CloseHandle(_streamEvent);
            return MERR_DEVICE_NOT_AVAILABLE;
      }

      _isOpen = true;
      return 0;
}

void MidiDriver_WIN::close() {
      if (!_isOpen)
            return;
      _isOpen = false;
      MidiDriver_MPU401::close();
      midiOutUnprepareHeader (_mo, &_streamHeader, sizeof (_streamHeader));
      check_error(midiOutClose(_mo));
      CloseHandle (_streamEvent);
}

void MidiDriver_WIN::send(uint32 b) {
      union {
            DWORD dwData;
            BYTE bData[4];
      } u;

      u.bData[3] = (byte)((b & 0xFF000000) >> 24);
      u.bData[2] = (byte)((b & 0x00FF0000) >> 16);
      u.bData[1] = (byte)((b & 0x0000FF00) >> 8);
      u.bData[0] = (byte)(b & 0x000000FF);

      check_error(midiOutShortMsg(_mo, u.dwData));
}

void MidiDriver_WIN::sysEx(const byte *msg, uint16 length) {
      if (!_isOpen)
            return;

      if (WaitForSingleObject (_streamEvent, 2000) == WAIT_TIMEOUT) {
            warning ("Could not send SysEx - MMSYSTEM is still trying to send data.");
            return;
      }

      midiOutUnprepareHeader (_mo, &_streamHeader, sizeof (_streamHeader));
      _streamBuffer [0] = 0xF0;
      memcpy(&_streamBuffer[1], msg, length);
      _streamBuffer [length+1] = 0xF7;

      _streamHeader.lpData = (char *) _streamBuffer;
      _streamHeader.dwBufferLength = length + 2;
      _streamHeader.dwBytesRecorded = length + 2;
      _streamHeader.dwUser = 0;
      _streamHeader.dwFlags = 0;

      MMRESULT result = midiOutPrepareHeader (_mo, &_streamHeader, sizeof (_streamHeader));
      if (result != MMSYSERR_NOERROR) {
            check_error (result);
            return;
      }

      ResetEvent(_streamEvent);
      result = midiOutLongMsg (_mo, &_streamHeader, sizeof (_streamHeader));
      if (result != MMSYSERR_NOERROR) {
            check_error(result);
            SetEvent(_streamEvent);
            return;
      }
}

void MidiDriver_WIN::check_error(MMRESULT result) {
      char buf[200];
      if (result != MMSYSERR_NOERROR) {
            midiOutGetErrorText(result, buf, 200);
            warning("MM System Error '%s'", buf);
      }
}

MidiDriver *MidiDriver_WIN_create() {
      return new MidiDriver_WIN();
}

#endif

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