/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001  Ludvig Strigeus
 * Copyright (C) 2001-2003 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.
 *
 * $Header$
 */

#include "stdafx.h"
#include "scumm/scumm.h"
#include "sound/mididrv.h"
#include "scumm/imuse.h"
#include "scumm/instrument.h"
#include "scumm/saveload.h"
#include "common/util.h"
#include "imuse_internal.h"

// Unremark this statement to activate some of
// the most common iMuse diagnostic messages.
// #define IMUSE_DEBUG



////////////////////////////////////////
//
//  IMuseInternal implementation
//
////////////////////////////////////////

IMuseInternal::IMuseInternal() :
_old_adlib_instruments (false),
_enable_multi_midi (false),
_midi_adlib (0),
_midi_native (0),
_base_sounds (0),
_paused (false),
_initialized (false),
_tempoFactor (0),
_queue_end (0),
_queue_pos (0),
_queue_sound (0),
_queue_adding (0),
_queue_marker (0),
_queue_cleared (0),
_master_volume (0),
_music_volume (0),
_trigger_count (0),
_snm_trigger_index (0)
{
	memset (_channel_volume,0,sizeof(_channel_volume));
	memset (_channel_volume_eff,0,sizeof(_channel_volume_eff));
	memset (_volchan_table,0,sizeof(_volchan_table));
	memset (_active_notes,0,sizeof(_active_notes));
}

IMuseInternal::~IMuseInternal() {
	terminate();
}

MidiDriver *IMuseInternal::getMidiDriver() {
	MidiDriver *driver = NULL;

	if (_midi_native) {
		driver = _midi_native;
#if !defined(__PALM_OS__) // Adlib not supported on PalmOS
	} else {
		// Route it through Adlib anyway.
		if (!_midi_adlib) {
			_midi_adlib = MidiDriver_ADLIB_create();
			initMidiDriver (_midi_adlib);
		}
		driver = _midi_adlib;
#endif
	}

	return driver;
}

byte *IMuseInternal::findTag(int sound, char *tag, int index) {
	byte *ptr = NULL;
	int32 size, pos;

	if (_base_sounds)
		ptr = _base_sounds[sound];

	if (ptr == NULL) {
		  debug(1, "IMuseInternal::findTag completely failed finding sound %d", sound);
		return NULL;

	}

	ptr += 8;
	size = READ_BE_UINT32_UNALIGNED(ptr);
	ptr += 4;

	pos = 0;

	while (pos < size) {
		if (!memcmp(ptr + pos, tag, 4) && !index--)
			return ptr + pos + 8;
		pos += READ_BE_UINT32_UNALIGNED(ptr + pos + 4) + 8;
	}

	debug(3, "IMuseInternal::findTag failed finding sound %d", sound);
	return NULL;
}

bool IMuseInternal::isMT32(int sound) {
	byte *ptr = NULL;
	uint32 tag;

	if (_base_sounds)
		ptr = _base_sounds[sound];

	if (ptr == NULL)
		return false;

	tag = *(((uint32 *)ptr) + 1);
	switch (tag) {
	case MKID('ADL '):
		return false;
	case MKID('ROL '):
		return true;
	case MKID('GMD '):
		return false;
	case MKID('MAC '):
		return true;
	case MKID('SPK '):
		return false;
	}

	return false;
}

bool IMuseInternal::isGM(int sound) {
	byte *ptr = NULL;
	uint32 tag;

	if (_base_sounds)
		ptr = _base_sounds[sound];

	if (ptr == NULL)
		return false;

	tag = *(((uint32 *)ptr) + 1);
	switch (tag) {
	case MKID('ADL '):
		return false;
	case MKID('ROL '):
		return true; // Yeah... for our purposes, this is GM
	case MKID('GMD '):
		return true;
	case MKID('MIDI'):
		return true;
	case MKID('MAC '):
		return true; // I guess this one too, since it qualifies under isMT32()
	case MKID('SPK '):
		return false;
	}

	return false;
}

MidiDriver *IMuseInternal::getBestMidiDriver (int sound) {
	MidiDriver *driver = NULL;

	if (isGM (sound)) {
		if (_midi_native) {
			driver = _midi_native;
#if !defined(__PALM_OS__) // Adlib not supported on PalmOS
		} else {
			// Route it through Adlib anyway.
			if (!_midi_adlib) {
				_midi_adlib = MidiDriver_ADLIB_create();
				initMidiDriver (_midi_adlib);
			}
			driver = _midi_adlib;
#endif
		}
#if !defined(__PALM_OS__) // Adlib not supported on PalmOS
	} else {
		if (!_midi_adlib && (_enable_multi_midi || !_midi_native)) {
			_midi_adlib = MidiDriver_ADLIB_create();
			initMidiDriver (_midi_adlib);
		}
		driver = _midi_adlib;
#endif
	}
	return driver;
}

bool IMuseInternal::startSound(int sound) {
	Player *player;
	void *mdhd;

	// Do not start a sound if it is already set to
	// start on an ImTrigger event. This fixes carnival
	// music problems where a sound has been set to trigger
	// at the right time, but then is started up immediately
	// anyway, only to be restarted later when the trigger
	// occurs.
	int i;
	ImTrigger *trigger = _snm_triggers;
	for (i = ARRAYSIZE (_snm_triggers); i; --i, ++trigger) {
		if (trigger->sound && trigger->id && trigger->command[0] == 8 && trigger->command[1] == sound)
			return false;
	}

	mdhd = findTag(sound, MDHD_TAG, 0);
	if (!mdhd) {
		mdhd = findTag(sound, MDPG_TAG, 0);
		if (!mdhd) {
			debug (2, "SE::startSound failed: Couldn't find sound %d", sound);
			return false;
		}
	}

	// Check which MIDI driver this track should use.
	// If it's NULL, it ain't something we can play.
	MidiDriver *driver = getBestMidiDriver (sound);
	if (!driver)
		return false;

	// If the requested sound is already playing, start it over
	// from scratch. This was originally a hack to prevent Sam & Max
	// iMuse messiness while upgrading the iMuse engine, but it
	// is apparently necessary to deal with fade-and-restart
	// race conditions that were observed in MI2. Reference
	// Bug #590511 and Patch #607175 (which was reversed to fix
	// an FOA regression: Bug #622606).
	player = findActivePlayer (sound);
	if (!player)
		player = allocate_player(128);
	if (!player)
		return false;

	player->clear();
	return player->startSound (sound, driver);
}


Player *IMuseInternal::allocate_player(byte priority) {
	Player *player = _players, *best = NULL;
	int i;
	byte bestpri = 255;

	for (i = ARRAYSIZE(_players); i != 0; i--, player++) {
		if (!player->isActive())
			return player;
		if (player->getPriority() < bestpri) {
			best = player;
			bestpri = player->getPriority();
		}
	}

	if (bestpri < priority)
		return best;

	debug(1, "Denying player request");
	return NULL;
}

void IMuseInternal::init_players() {
	Player *player = _players;
	int i;

	for (i = ARRAYSIZE(_players); i != 0; i--, player++) {
		player->clear(); // Used to just set _active to false
		player->_se = this;
	}
}

void IMuseInternal::init_parts() {
	Part *part;
	int i;

	for (i = 0, part = _parts; i != ARRAYSIZE(_parts); i++, part++) {
		part->init();
		part->_slot = i;
	}
}

int IMuseInternal::stopSound(int sound) {
	int r = -1;
	Player *player = findActivePlayer (sound);
	if (player) {
		player->clear();
		r = 0;
	}
	return r;
}

int IMuseInternal::stop_all_sounds() {
	Player *player = _players;
	int i;

	for (i = ARRAYSIZE(_players); i != 0; i--, player++) {
		if (player->isActive())
			player->clear();
	}
	return 0;
}

void IMuseInternal::on_timer (MidiDriver *midi) {
	if (_paused)
		return;

	if (midi == _midi_native || !_midi_native)
		handleDeferredCommands (midi);
	sequencer_timers (midi);
}

void IMuseInternal::sequencer_timers (MidiDriver *midi) {
	Player *player = _players;
	int i;

	for (i = ARRAYSIZE(_players); i != 0; i--, player++) {
		if (player->isActive() && player->getMidiDriver() == midi) {
			player->onTimer();
		}
	}
}

void IMuseInternal::handle_marker(uint id, byte data) {
	uint16 *p = 0;
	uint pos;

	if (_queue_adding && _queue_sound == id && data == _queue_marker)
		return;

	// Fix for bug #733401: It would seem that sometimes the
	// queue read position gets out of sync (possibly just
	// reset to zero). Therefore, the read position should
	// skip over any empty (i.e. all zeros) queue entries
	// until it finds a legit entry to review.
	pos = _queue_end;
	while (pos != _queue_pos) {
		p = _cmd_queue[pos].array;
		if ((p[0] | p[1] | p[2] | p[3] | p[4] | p[5] | p[6] | p[7]) != 0)
			break;
		warning ("Skipping empty command queue entry at position %d", pos);
		pos = (pos + 1) & (ARRAYSIZE(_cmd_queue) - 1);
	}

	if (pos == _queue_pos)
		return;

	if (p[0] != TRIGGER_ID || p[1] != id || p[2] != data)
		return;

	_trigger_count--;
	_queue_cleared = false;
	do {
		pos = (pos + 1) & (ARRAYSIZE(_cmd_queue) - 1);
		if (_queue_pos == pos)
			break;
		p = _cmd_queue[pos].array;
		if (*p++ != COMMAND_ID)
			break;
		_queue_end = pos;

		doCommand(p[0], p[1], p[2], p[3], p[4], p[5], p[6], 0);

		if (_queue_cleared)
			return;
		pos = _queue_end;
	} while (1);

	_queue_end = pos;
}

int IMuseInternal::get_channel_volume(uint a) {
	if (a < 8)
		return _channel_volume_eff[a];
	return (_master_volume * _music_volume / 255) >> 1;
}

Part *IMuseInternal::allocate_part (byte pri, MidiDriver *midi) {
	Part *part, *best = NULL;
	int i;

	for (i = ARRAYSIZE(_parts), part = _parts; i != 0; i--, part++) {
		if (!part->_player)
			return part;
		if (pri >= part->_pri_eff) {
			pri = part->_pri_eff;
			best = part;
		}
	}

	if (best) {
		best->uninit();
		reallocateMidiChannels (midi);
	} else {
		debug(1, "Denying part request");
	}
	return best;
}

int IMuseInternal::getSoundStatus(int sound) {
	Player *player = findActivePlayer (sound);
	if (player && !player->isFadingOut())
		return 1;
	return get_queue_sound_status(sound);
}

// This is exactly the same as getSoundStatus except that
// it treats sounds that are fading out just the same as
// other sounds. This is the method to use when determining
// what resources to expire from memory.
bool IMuseInternal::get_sound_active(int sound) {
	Player *player = findActivePlayer (sound);
	if (player)
		return 1;
	return (get_queue_sound_status(sound) != 0);
}

int IMuseInternal::get_queue_sound_status(int sound) {
	uint16 *a;
	int i, j;

	j = _queue_pos;
	i = _queue_end;

	while (i != j) {
		a = _cmd_queue[i].array;
		if (a[0] == COMMAND_ID && a[1] == 8 && a[2] == (uint16)sound)
			return 2;
		i = (i + 1) & (ARRAYSIZE(_cmd_queue) - 1);
	}
	return 0;
}

int IMuseInternal::set_volchan(int sound, int volchan) {
	int r;
	int i;
	int num;
	Player *player, *best, *sameid;

	r = get_volchan_entry(volchan);
	if (r == -1)
		return -1;

	if (r >= 8) {
		player = findActivePlayer (sound);
		if (player && player->_vol_chan != (uint16)volchan) {
			player->_vol_chan = volchan;
			player->setVolume (player->getVolume());
			return 0;
		}
		return -1;
	} else {
		best = NULL;
		num = 0;
		sameid = NULL;
		for (i = ARRAYSIZE(_players), player = _players; i != 0; i--, player++) {
			if (player->isActive()) {
				if (player->_vol_chan == (uint16)volchan) {
					num++;
					if (!best || player->getPriority() <= best->getPriority())
						best = player;
				} else if (player->getID() == (uint16)sound) {
					sameid = player;
				}
			}
		}
		if (sameid == NULL)
			return -1;
		if (num >= r)
			best->clear();
		player->_vol_chan = volchan;
		player->setVolume (player->getVolume());
		return 0;
	}
}

int IMuseInternal::clear_queue() {
	_queue_adding = false;
	_queue_cleared = true;
	_queue_pos = 0;
	_queue_end = 0;
	_trigger_count = 0;
	return 0;
}

int IMuseInternal::enqueue_command(int a, int b, int c, int d, int e, int f, int g) {
	uint16 *p;
	uint i;

	i = _queue_pos;

	if (i == _queue_end)
		return -1;

	if (a == -1) {
		_queue_adding = false;
		_trigger_count++;
		return 0;
	}

	p = _cmd_queue[_queue_pos].array;
	p[0] = COMMAND_ID;
	p[1] = a;
	p[2] = b;
	p[3] = c;
	p[4] = d;
	p[5] = e;
	p[6] = f;
	p[7] = g;

	i = (i + 1) & (ARRAYSIZE(_cmd_queue) - 1);

	if (_queue_end != i) {
		_queue_pos = i;
		return 0;
	} else {
		_queue_pos = (i - 1) & (ARRAYSIZE(_cmd_queue) - 1);
		return -1;
	}
}

int IMuseInternal::query_queue(int param) {
	switch (param) {
	case 0: // Get trigger count
		return _trigger_count;
	case 1: // Get trigger type
		if (_queue_end == _queue_pos)
			return -1;
		return _cmd_queue[_queue_end].array[1];
	case 2: // Get trigger sound
		if (_queue_end == _queue_pos)
			return 0xFF;
		return _cmd_queue[_queue_end].array[2];
	default:
		return -1;
	}
}

int IMuseInternal::get_music_volume() {
	return _music_volume;
}

int IMuseInternal::set_music_volume(uint vol) {
	if (vol > 255)
		vol = 255;
	if (_music_volume == vol)
		return 0;
	_music_volume = vol;
	vol = vol * _master_volume / 255;
	for (uint i = 0; i < ARRAYSIZE (_channel_volume); i++) {
		_channel_volume_eff[i] = _channel_volume[i] * vol / 255;
	}
	if (!_paused)
		update_volumes();
	return 0;
}

int IMuseInternal::set_master_volume (uint vol) {
	if (vol > 255)
		vol = 255;
	if (_master_volume == vol)
		return 0;
	_master_volume = vol;
	vol = vol * _music_volume / 255;
	for (uint i = 0; i < ARRAYSIZE (_channel_volume); i++) {
		_channel_volume_eff[i] = _channel_volume[i] * vol / 255;
	}
	if (!_paused)
		update_volumes();
	return 0;
}

int IMuseInternal::get_master_volume() {
	return _master_volume;
}

int IMuseInternal::terminate() {
	if (_midi_adlib) {
		_midi_adlib->close();
		delete _midi_adlib;
		_midi_adlib = 0;
	}

	if (_midi_native) {
		_midi_native->close();
		delete _midi_native;
		_midi_native = 0;
	}

	return 0;
}

int IMuseInternal::enqueue_trigger(int sound, int marker) {
	uint16 *p;
	uint pos;

	pos = _queue_pos;

	p = _cmd_queue[pos].array;
	p[0] = TRIGGER_ID;
	p[1] = sound;
	p[2] = marker;

	pos = (pos + 1) & (ARRAYSIZE(_cmd_queue) - 1);
	if (_queue_end == pos) {
		_queue_pos = (pos - 1) & (ARRAYSIZE(_cmd_queue) - 1);
		return -1;
	}

	_queue_pos = pos;
	_queue_adding = true;
	_queue_sound = sound;
	_queue_marker = marker;
	return 0;
}

int32 IMuseInternal::doCommand(int a, int b, int c, int d, int e, int f, int g, int h) {
	int i;
	byte cmd = a & 0xFF;
	byte param = a >> 8;
	Player *player = NULL;

	if (!_initialized && (cmd || param))
		return -1;

#ifdef IMUSE_DEBUG
	debug (0, "doCommand - %d (%d/%d), %d, %d, %d, %d, %d, %d, %d", a, (int) param, (int) cmd, b, c, d, e, f, g, h);
#endif

	if (param == 0) {
		switch (cmd) {
		case 6:
			if (b > 127)
				return -1;
			else
				return set_master_volume ((b << 1) | (b ? 0 : 1)); // Convert b from 0-127 to 0-255
		case 7:
			return _master_volume >> 1; // Convert from 0-255 to 0-127
		case 8:
			return startSound(b) ? 0 : -1;
		case 9:
			return stopSound(b);
		case 10: // FIXME: Sam and Max - Not sure if this is correct
			return stop_all_sounds();
		case 11:
			return stop_all_sounds();
		case 12:
			// Sam & Max: Player-scope commands
			player = findActivePlayer (b);
			if (!player)
				return -1;

			switch (d) {
			case 6:
				// Set player volume.
				return player->setVolume (e);
			default:
				warning("IMuseInternal::doCommand (6) unsupported sub-command %d", d);
			}
			return -1;
		case 13:
			return getSoundStatus(b);
		case 14:
			// Sam and Max: Parameter fade
			player = this->findActivePlayer (b);
			if (player)
				return player->addParameterFader (d, e, f);
			return -1;

		case 15:
			// Sam & Max: Set hook for a "maybe" jump
			player = findActivePlayer (b);
			if (player) {
				player->setHook (0, d, 0);
				return 0;
			}
			return -1;
		case 16:
			return set_volchan(b, c);
		case 17:
			if (g_scumm->_gameId != GID_SAMNMAX) {
				return set_channel_volume(b, c);
			} else {
				if (e || f || g || h) 
					return ImSetTrigger (b, d, e, f, g, h);
				else
					return ImClearTrigger (b, d);
			}
		case 18:
			if (g_scumm->_gameId != GID_SAMNMAX) {
				return set_volchan_entry(b, c);
			} else {
				// Sam & Max: ImCheckTrigger.
				// According to Mike's notes to Ender,
				// this function returns the number of triggers
				// associated with a particular player ID and
				// trigger ID.
				a = 0;
				for (i = 0; i < 16; ++i) {
					if (_snm_triggers [i].sound == b && _snm_triggers [i].id &&
					    (d == -1 || _snm_triggers [i].id == d))
					{
						++a;
					}
				}
				return a;
			}
		case 19:
			// Sam & Max: ImClearTrigger
			// This should clear a trigger that's been set up
			// with ImSetTrigger (cmd == 17). Seems to work....
			return ImClearTrigger (b, d);
		case 20:
			// Sam & Max: Deferred Command
			// warning ("[--] doCommand (20): %3d %3d %3d %3d %3d %3d  (%d)", c, d, e, f, g, h, b);
			addDeferredCommand (b, c, d, e, f, g, h);
			return 0;
		case 2:
		case 3:
			return 0;
		default:
			warning("doCommand (%d [%d/%d], %d, %d, %d, %d, %d, %d, %d) unsupported", a, param, cmd, b, c, d, e, f, g, h);
		}
	} else if (param == 1) {
		if ((1 << cmd) & (0x783FFF)) {
			player = findActivePlayer(b);
			if (!player)
				return -1;
			if ((1 << cmd) & (1 << 11 | 1 << 22)) {
				assert(c >= 0 && c <= 15);
				player = (Player *) player->getPart(c);
				if (!player)
					return -1;
			}
		}

		switch (cmd) {
		case 0:
			if (g_scumm->_gameId == GID_SAMNMAX) {
				if (d == 1) // Measure number
					return ((player->getBeatIndex() - 1) >> 2) + 1;
				else if (d == 2) // Beat number
					return player->getBeatIndex();
				return -1;
			} else {
				return player->getParam(c, d);
			}
		case 1:
			if (g_scumm->_gameId == GID_SAMNMAX)
				player->jump (d - 1, (e - 1) * 4 + f, ((g * player->getTicksPerBeat()) >> 2) + h);
			else
				player->setPriority(c);
			return 0;
		case 2:
			return player->setVolume(c);
		case 3:
			player->setPan(c);
			return 0;
		case 4:
			return player->setTranspose(c, d);
		case 5:
			player->setDetune(c);
			return 0;
		case 6:
			player->setSpeed(c);
			return 0;
		case 7:
			return player->jump(c, d, e) ? 0 : -1;
		case 8:
			return player->scan(c, d, e);
		case 9:
			return player->setLoop(c, d, e, f, g) ? 0 : -1;
		case 10:
			player->clearLoop();
			return 0;
		case 11:
			((Part *)player)->set_onoff(d != 0);
			return 0;
		case 12:
			return player->setHook(c, d, e);
		case 13:
			return player->addParameterFader (ParameterFader::pfVolume, c, d);
		case 14:
			return enqueue_trigger(b, c);
		case 15:
			return enqueue_command(b, c, d, e, f, g, h);
		case 16:
			return clear_queue();
		case 19:
			return player->getParam(c, d);
		case 20:
			return player->setHook(c, d, e);
		case 21:
			return -1;
		case 22:
			((Part *)player)->setVolume(d);
			return 0;
		case 23:
			return query_queue(b);
		case 24:
			return 0;
		default:
			warning("doCommand (%d [%d/%d], %d, %d, %d, %d, %d, %d, %d) unsupported", a, param, cmd, b, c, d, e, f, g, h);
			return -1;
		}
	}

	return -1;
}

int32 IMuseInternal::ImSetTrigger (int sound, int id, int a, int b, int c, int d) {
	// Sam & Max: ImSetTrigger.
	// Sets a trigger for a particular player and
	// marker ID, along with doCommand parameters
	// to invoke at the marker. The marker is
	// represented by MIDI SysEx block 00 xx (F7)
	// where "xx" is the marker ID.
	uint16 oldest_trigger = 0;
	ImTrigger *oldest_ptr = NULL;

	int i;
	ImTrigger *trig = _snm_triggers;
	for (i = ARRAYSIZE (_snm_triggers); i; --i, ++trig) {
		if (!trig->id)
			break;
		if (trig->id == id && trig->sound == sound)
			break;

		uint16 diff;
		if (trig->expire <= _snm_trigger_index)
			diff = _snm_trigger_index - trig->expire;
		else
			diff = 0x10000 - trig->expire + _snm_trigger_index;

		if (!oldest_ptr || oldest_trigger < diff) {
			oldest_ptr = trig;
			oldest_trigger = diff;
		}
	}

	// If we didn't find a trigger, see if we can expire one.
	if (!i) {
		if (!oldest_ptr)
			return -1;
		trig = oldest_ptr;
	}

	trig->id = id;
	trig->sound = sound;
	trig->expire = (++_snm_trigger_index & 0xFFFF);
	trig->command [0] = a;
	trig->command [1] = b;
	trig->command [2] = c;
	trig->command [3] = d;

	// If the command is to start a sound, stop that sound if it's already playing.
	// This fixes some carnival music problems.
	if (trig->command [0] == 8 && getSoundStatus (trig->command [1]))
		stopSound (trig->command [1]);
	return 0;
}

int32 IMuseInternal::ImClearTrigger (int sound, int id) {
	int count = 0;
	int i;
	for (i = 0; i < 16; ++i) {
		if (_snm_triggers [i].sound == sound && _snm_triggers [i].id &&
			(id == -1 || _snm_triggers [i].id == id))
		{
			_snm_triggers [i].sound = _snm_triggers [i].id = 0;
			++count;
		}
	}
	return (count > 0) ? 0 : -1;
}

int32 IMuseInternal::ImFireAllTriggers (int sound) {
	if (!sound) return 0;
	int count = 0;
	int i;
	for (i = 0; i < 16; ++i) {
		if (_snm_triggers [i].sound == sound)
		{
			_snm_triggers [i].sound = _snm_triggers [i].id = 0;
			doCommand (_snm_triggers [i].command [0],
			           _snm_triggers [i].command [1],
			           _snm_triggers [i].command [2],
			           _snm_triggers [i].command [3],
			           0, 0, 0, 0);
			++count;
		}
	}
	return (count > 0) ? 0 : -1;
}

int IMuseInternal::set_channel_volume(uint chan, uint vol)
{
	if (chan >= 8 || vol > 127)
		return -1;

	_channel_volume[chan] = vol;
	_channel_volume_eff[chan] = _master_volume * _music_volume * vol / 255 / 255;
	update_volumes();
	return 0;
}

void IMuseInternal::update_volumes() {
	Player *player;
	int i;

	for (i = ARRAYSIZE(_players), player = _players; i != 0; i--, player++) {
		if (player->isActive())
			player->setVolume (player->getVolume());
	}
}

int IMuseInternal::set_volchan_entry(uint a, uint b) {
	if (a >= 8)
		return -1;
	_volchan_table[a] = b;
	return 0;
}

int HookDatas::query_param(int param, byte chan) {
	switch (param) {
	case 18:
		return _jump[0];
	case 19:
		return _transpose;
	case 20:
		return _part_onoff[chan];
	case 21:
		return _part_volume[chan];
	case 22:
		return _part_program[chan];
	case 23:
		return _part_transpose[chan];
	default:
		return -1;
	}
}

int HookDatas::set(byte cls, byte value, byte chan) {
	switch (cls) {
	case 0:
		if (value != _jump[0]) {
			_jump[1] = _jump[0];
			_jump[0] = value;
		}
		break;
	case 1:
		_transpose = value;
		break;
	case 2:
		if (chan < 16)
			_part_onoff[chan] = value;
		else if (chan == 16)
			memset(_part_onoff, value, 16);
		break;
	case 3:
		if (chan < 16)
			_part_volume[chan] = value;
		else if (chan == 16)
			memset(_part_volume, value, 16);
		break;
	case 4:
		if (chan < 16)
			_part_program[chan] = value;
		else if (chan == 16)
			memset(_part_program, value, 16);
		break;
	case 5:
		if (chan < 16)
			_part_transpose[chan] = value;
		else if (chan == 16)
			memset(_part_transpose, value, 16);
		break;
	default:
		return -1;
	}
	return 0;
}

Player *IMuseInternal::findActivePlayer (int id) {
	int i;
	Player *player;

	for (i = ARRAYSIZE(_players), player = _players; i != 0; i--, player++) {
		if (player->isActive() && player->getID() == (uint16)id)
			return player;
	}
	return NULL;
}

int IMuseInternal::get_volchan_entry(uint a) {
	if (a < 8)
		return _volchan_table[a];
	return -1;
}

uint32 IMuseInternal::property(int prop, uint32 value) {
	switch (prop) {
	case IMuse::PROP_TEMPO_BASE:
		// This is a specified as a percentage of normal
		// music speed. The number must be an integer
		// ranging from 50 to 200 (for 50% to 200% normal speed).
		if (value >= 50 && value <= 200)
			_tempoFactor = value;
		break;

	case IMuse::PROP_NATIVE_MT32:
		Instrument::nativeMT32 (value > 0);
		break;

	case IMuse::PROP_MULTI_MIDI:
		_enable_multi_midi = (value > 0);
		if (!_enable_multi_midi && _midi_native && _midi_adlib) {
			MidiDriver *driver = _midi_adlib;
			_midi_adlib = NULL;
			int i;
			for (i = 0; i < ARRAYSIZE(_players); ++i) {
				if (_players[i].isActive() && _players[i].getMidiDriver() == driver)
					_players[i].clear();
			}
			driver->close();
		}
		break;

	case IMuse::PROP_OLD_ADLIB_INSTRUMENTS:
		_old_adlib_instruments = (value > 0);
	}
	return 0;
}

void IMuseInternal::setBase(byte **base) {
	_base_sounds = base;
}

IMuseInternal *IMuseInternal::create (OSystem *syst, MidiDriver *native_midi) {
	IMuseInternal *i = new IMuseInternal;
	i->initialize(syst, native_midi);
	return i;
}

int IMuseInternal::initialize(OSystem *syst, MidiDriver *native_midi) {
	int i;

	_midi_native = native_midi;
	_midi_adlib = NULL;
	if (native_midi)
		initMidiDriver (_midi_native);

	if (!_tempoFactor) _tempoFactor = 100;
	_master_volume = 255;
	if (_music_volume < 1)
		_music_volume = kDefaultMusicVolume;

	for (i = 0; i != 8; i++)
		_channel_volume[i] = _channel_volume_eff[i] = _volchan_table[i] = 127;

	init_players();
	init_queue();
	init_parts();

	_initialized = true;

	return 0;
}

void IMuseInternal::initMidiDriver (MidiDriver *midi) {
	// Open MIDI driver
	midi->property (MidiDriver::PROP_OLD_ADLIB, _old_adlib_instruments ? 1 : 0);

	int result = midi->open();
	if (result)
		error("IMuse initialization - ", MidiDriver::getErrorName(result));

	// Connect to the driver's timer
	midi->setTimerCallback (midi, &IMuseInternal::midiTimerCallback);
}

void IMuseInternal::init_queue() {
	_queue_adding = false;
	_queue_pos = 0;
	_queue_end = 0;
	_trigger_count = 0;
}

void IMuseInternal::pause(bool paused) {
	int vol = _music_volume;
	if (paused)
		_music_volume = 0;
	update_volumes();
	_music_volume = vol;

	_paused = paused;
}

void IMuseInternal::handleDeferredCommands (MidiDriver *midi) {
	uint32 advance = midi->getBaseTempo();

	DeferredCommand *ptr = &_deferredCommands[0];
	int i;
	for (i = ARRAYSIZE(_deferredCommands); i; --i, ++ptr) {
		if (!ptr->time_left)
			continue;
		if (ptr->time_left <= advance) {
			doCommand (ptr->a, ptr->b, ptr->c, ptr->d, ptr->e, ptr->f, 0, 0);
			ptr->time_left = advance;
		}
		ptr->time_left -= advance;
	}
}

// "time" is interpreted as hundredths of a second.
// FIXME: Is that correct?
// We convert it to microseconds before prceeding
void IMuseInternal::addDeferredCommand (int time, int a, int b, int c, int d, int e, int f) {
	DeferredCommand *ptr = &_deferredCommands[0];
	int i;
	for (i = ARRAYSIZE(_deferredCommands); i; --i, ++ptr) {
		if (!ptr->time_left)
			break;
	}

	if (ptr) {
		ptr->midi = _midi_native ? _midi_native : _midi_adlib;
		ptr->time_left = time * 10000;
		ptr->a = a;
		ptr->b = b;
		ptr->c = c;
		ptr->d = d;
		ptr->e = e;
		ptr->f = f;
	}
}

////////////////////////////////////////////////////////////
//
// IMuseInternal load/save implementation
//
////////////////////////////////////////////////////////////

enum {
	TYPE_PART = 1,
	TYPE_PLAYER = 2
};

int IMuseInternal::saveReference(void *me_ref, byte type, void *ref) {
	IMuseInternal *me = (IMuseInternal *)me_ref;
	switch (type) {
	case TYPE_PART:
		return (Part *)ref - me->_parts;
	case TYPE_PLAYER:
		return (Player *)ref - me->_players;
	default:
		error("saveReference: invalid type");
	}
}

void *IMuseInternal::loadReference(void *me_ref, byte type, int ref) {
	IMuseInternal *me = (IMuseInternal *)me_ref;
	switch (type) {
	case TYPE_PART:
		return &me->_parts[ref];
	case TYPE_PLAYER:
		return &me->_players[ref];
	default:
		error("loadReference: invalid type");
	}
}

int IMuseInternal::save_or_load(Serializer *ser, Scumm *scumm) {
	const SaveLoadEntry mainEntries[] = {
		MKLINE(IMuseInternal, _queue_end, sleUint8, VER_V8),
		MKLINE(IMuseInternal, _queue_pos, sleUint8, VER_V8),
		MKLINE(IMuseInternal, _queue_sound, sleUint16, VER_V8),
		MKLINE(IMuseInternal, _queue_adding, sleByte, VER_V8),
		MKLINE(IMuseInternal, _queue_marker, sleByte, VER_V8),
		MKLINE(IMuseInternal, _queue_cleared, sleByte, VER_V8),
		MKLINE(IMuseInternal, _master_volume, sleByte, VER_V8),
		MKLINE(IMuseInternal, _trigger_count, sleUint16, VER_V8),
		MKARRAY(IMuseInternal, _channel_volume[0], sleUint16, 8, VER_V8),
		MKARRAY(IMuseInternal, _volchan_table[0], sleUint16, 8, VER_V8),
		// TODO: Add _cmd_queue in here
		MKEND()
	};

	// VolumeFader is obsolete.
	const SaveLoadEntry volumeFaderEntries[] = {
		MK_OBSOLETE_REF(VolumeFader, player, TYPE_PLAYER, VER_V8, VER_V16),
		MK_OBSOLETE(VolumeFader, active, sleUint8, VER_V8, VER_V16),
		MK_OBSOLETE(VolumeFader, curvol, sleUint8, VER_V8, VER_V16),
		MK_OBSOLETE(VolumeFader, speed_lo_max, sleUint16, VER_V8, VER_V16),
		MK_OBSOLETE(VolumeFader, num_steps, sleUint16, VER_V8, VER_V16),
		MK_OBSOLETE(VolumeFader, speed_hi, sleInt8, VER_V8, VER_V16),
		MK_OBSOLETE(VolumeFader, direction, sleInt8, VER_V8, VER_V16),
		MK_OBSOLETE(VolumeFader, speed_lo, sleInt8, VER_V8, VER_V16),
		MK_OBSOLETE(VolumeFader, speed_lo_counter, sleUint16, VER_V8, VER_V16),
		MKEND()
	};

	const SaveLoadEntry partEntries[] = {
		MKREF(Part, _next, TYPE_PART, VER_V8),
		MKREF(Part, _prev, TYPE_PART, VER_V8),
		MKREF(Part, _player, TYPE_PLAYER, VER_V8),
		MKLINE(Part, _pitchbend, sleInt16, VER_V8),
		MKLINE(Part, _pitchbend_factor, sleUint8, VER_V8),
		MKLINE(Part, _transpose, sleInt8, VER_V8),
		MKLINE(Part, _vol, sleUint8, VER_V8),
		MKLINE(Part, _detune, sleInt8, VER_V8),
		MKLINE(Part, _pan, sleInt8, VER_V8),
		MKLINE(Part, _on, sleUint8, VER_V8),
		MKLINE(Part, _modwheel, sleUint8, VER_V8),
		MKLINE(Part, _pedal, sleUint8, VER_V8),
		MK_OBSOLETE(Part, _program, sleUint8, VER_V8, VER_V16),
		MKLINE(Part, _pri, sleUint8, VER_V8),
		MKLINE(Part, _chan, sleUint8, VER_V8),
		MKLINE(Part, _effect_level, sleUint8, VER_V8),
		MKLINE(Part, _chorus, sleUint8, VER_V8),
		MKLINE(Part, _percussion, sleUint8, VER_V8),
		MKLINE(Part, _bank, sleUint8, VER_V8),
		MKEND()
	};

#ifdef _WIN32_WCE // Don't break savegames made with andys' build
	if (!ser->isSaving() && ser->checkEOFLoadStream())
		return 0;
#elif defined(__PALM_OS__) //	previous PalmOS ver. without imuse implementation or not saved(Oopps...forgot it !), is this really working ? will we have sound with old saved game ?
	if (!ser->isSaving() && ser->checkEOFLoadStream())
		return 0;	//palmfixme

#endif

	int i;

	ser->_ref_me = this;
	ser->_save_ref = saveReference;
	ser->_load_ref = loadReference;

	ser->saveLoadEntries(this, mainEntries);
	for (i = 0; i < ARRAYSIZE(_players); ++i)
		_players[i].save_or_load (ser);
	ser->saveLoadArrayOf(_parts, ARRAYSIZE(_parts), sizeof(_parts[0]), partEntries);

	{ // Load/save the instrument definitions, which were revamped with V11.
		Part *part = &_parts[0];
		if (ser->getVersion() >= VER_V11) {
			for (i = ARRAYSIZE(_parts); i; --i, ++part) {
				part->_instrument.saveOrLoad (ser);
			}
		} else {
			for (i = ARRAYSIZE(_parts); i; --i, ++part)
				part->_instrument.clear();
		}
	}

	// VolumeFader has been replaced with the more generic ParameterFader.
	for (i = 0; i < 8; ++i)
		ser->saveLoadEntries (0, volumeFaderEntries);

	if (!ser->isSaving()) {
		// Load all sounds that we need
		fix_players_after_load(scumm);
		fix_parts_after_load();
		set_master_volume (_master_volume);

		if (_midi_native)
			reallocateMidiChannels (_midi_native);
		if (_midi_adlib)
			reallocateMidiChannels (_midi_adlib);
	}

	return 0;
}

#undef MKLINE
#undef MKEND

void IMuseInternal::fix_parts_after_load() {
	Part *part;
	int i;

	for (i = ARRAYSIZE(_parts), part = _parts; i != 0; i--, part++) {
		if (part->_player)
			part->fix_after_load();
	}
}

// Only call this routine from the main thread,
// since it uses getResourceAddress
void IMuseInternal::fix_players_after_load(Scumm *scumm) {
	Player *player = _players;
	int i;

	for (i = ARRAYSIZE(_players); i != 0; i--, player++) {
		if (player->isActive()) {
			scumm->getResourceAddress(rtSound, player->getID());
			player->fixAfterLoad();
		}
	}
}

void Part::set_detune(int8 detune) {
	_detune_eff = clamp((_detune = detune) + _player->getDetune(), -128, 127);
	if (_mc) {
		_mc->pitchBend (clamp(_pitchbend +
						(_detune_eff * 64 / 12) +
						(_transpose_eff * 8192 / 12), -8192, 8191));
	}
}

void Part::set_pitchbend(int value) {
	_pitchbend = value;
	if (_mc) {
		_mc->pitchBend (clamp(_pitchbend +
						(_detune_eff * 64 / 12) +
						(_transpose_eff * 8192 / 12), -8192, 8191));
	}
}

void Part::setVolume(uint8 vol) {
	_vol_eff = ((_vol = vol) + 1) * _player->getEffectiveVolume() >> 7;
	if (_mc)
		_mc->volume (_vol_eff);
}

void Part::set_pri(int8 pri) {
	_pri_eff = clamp((_pri = pri) + _player->getPriority(), 0, 255);
	if (_mc)
		_mc->priority (_pri_eff);
}

void Part::set_pan(int8 pan) {
	_pan_eff = clamp((_pan = pan) + _player->getPan(), -64, 63);
	if (_mc)
		_mc->panPosition (_pan_eff + 0x40);
}

void Part::set_transpose(int8 transpose) {
	_transpose_eff = transpose_clamp((_transpose = transpose) + _player->getTranspose(), -12, 12);
	if (_mc) {
		_mc->pitchBend (clamp(_pitchbend +
						(_detune_eff * 64 / 12) +
						(_transpose_eff * 8192 / 12), -8192, 8191));
	}
}

void Part::set_pedal(bool value) {
	_pedal = value;
	if (_mc)
		_mc->sustain (_pedal);
}

void Part::set_modwheel(uint value) {
	_modwheel = value;
	if (_mc)
		_mc->modulationWheel (_modwheel);
}

void Part::set_chorus(uint chorus) {
	_chorus = chorus;
	if (_mc)
		_mc->chorusLevel (_effect_level);
}

void Part::set_effect_level(uint level)
{
	_effect_level = level;
	if (_mc)
		_mc->effectLevel (_effect_level);
}

void Part::fix_after_load() {
	set_transpose(_transpose);
	setVolume(_vol);
	set_detune(_detune);
	set_pri(_pri);
	set_pan(_pan);
	sendAll();
}

void Part::set_pitchbend_factor(uint8 value) {
	if (value > 12)
		return;
	set_pitchbend(0);
	_pitchbend_factor = value;
	if (_mc)
		_mc->pitchBendFactor (_pitchbend_factor);
}

void Part::set_onoff(bool on) {
	if (_on != on) {
		_on = on;
		if (!on)
			off();
		if (!_percussion)
			_player->_se->reallocateMidiChannels (_player->getMidiDriver());
	}
}

void Part::set_instrument(byte * data) {
	_instrument.adlib (data);
	if (clearToTransmit())
		_instrument.send (_mc);
}

void Part::load_global_instrument (byte slot) {
	_player->_se->copyGlobalAdlibInstrument (slot, &_instrument);
	if (clearToTransmit())
		_instrument.send (_mc);
}

void Part::key_on(byte note, byte velocity) {
	MidiChannel *mc = _mc;
	_actives[note >> 4] |= (1 << (note & 0xF));

	// DEBUG
	if (_unassigned_instrument && !_percussion) {
		_unassigned_instrument = false;
		if (!_instrument.isValid()) {
			warning ("[%02d] No instrument specified", (int) _chan);
			return;
		}
	}

	if (mc && _instrument.isValid()) {
		mc->noteOn (note, velocity);
	} else if (_percussion) {
		mc = _player->getMidiDriver()->getPercussionChannel();
		if (!mc)
			return;
		mc->volume (_vol_eff);
		mc->programChange (_bank);
		mc->noteOn (note, velocity);
	}
}

void Part::key_off(byte note) {
	MidiChannel *mc = _mc;
	_actives[note >> 4] &= ~(1 << (note & 0xF));
	if (mc) {
		mc->noteOff (note);
	} else if (_percussion) {
		mc = _player->getMidiDriver()->getPercussionChannel();
		if (mc)
			mc->noteOff (note);
	}
}

void Part::init() {
	_player = NULL;
	_next = NULL;
	_prev = NULL;
	_mc = NULL;
	memset(_actives, 0, sizeof (_actives));
}

void Part::setup(Player *player) {
	_player = player;

	_percussion = (player->isGM() && _chan == 9); // true;
	_on = true;
	_pri_eff = player->getPriority();
	_pri = 0;
	_vol = 127;
	_vol_eff = player->getEffectiveVolume();
	_pan = clamp (player->getPan(), -64, 63);
	_transpose_eff = player->getTranspose();
	_transpose = 0;
	_detune = 0;
	_detune_eff = player->getDetune();
	_pitchbend_factor = 2;
	_pitchbend = 0;
	_effect_level = 64;
	_instrument.clear();
	_unassigned_instrument = true;
	_chorus = 0;
	_modwheel = 0;
	_bank = 0;
	_pedal = false;
	_mc = NULL;
}

void Part::uninit() {
	if (!_player)
		return;
	off();
	_player->removePart (this);
	_player = NULL;
}

void Part::off() {
	if (_mc) {
		_mc->allNotesOff();
		_mc->release();
		_mc = NULL;
	}
	memset (_actives, 0, sizeof(_actives));
}

bool Part::clearToTransmit() {
	if (_mc) return true;
	if (_instrument.isValid()) _player->_se->reallocateMidiChannels (_player->getMidiDriver());
	return false;
}

void Part::sendAll() {
	if (!clearToTransmit()) return;
	_mc->pitchBendFactor (_pitchbend_factor);
	_mc->pitchBend (clamp(_pitchbend +
	                (_detune_eff * 64 / 12) +
	                (_transpose_eff * 8192 / 12), -8192, 8191));
	_mc->volume (_vol_eff);
	_mc->sustain (_pedal);
	_mc->modulationWheel (_modwheel);
	_mc->panPosition (_pan_eff + 0x40);
	_mc->effectLevel (_effect_level);
	if (_instrument.isValid())
		_instrument.send (_mc);
	_mc->chorusLevel (_effect_level);
	_mc->priority (_pri_eff);
}

int Part::update_actives(uint16 *active) {
	int i, j;
	uint16 *act, mask, bits;
	int count = 0;

	bits = 1 << _chan;
	act = _actives;

	for (i = 8; i; i--) {
		mask = *act++;
		if (mask) {
			for (j = 16; j; j--, mask >>= 1, active++) {
				if (mask & 1 && !(*active & bits)) {
					*active |= bits;
					count++;
				}
			}
		} else {
			active += 16;
		}
	}
	return count;
}

void Part::set_program(byte program) {
	_bank = 0;
	_instrument.program (program, _player->isMT32());
	if (clearToTransmit())
		_instrument.send (_mc);
}

void Part::set_instrument(uint b) {
	_bank = (byte)(b >> 8);
	_instrument.program ((byte) b, _player->isMT32());
	if (clearToTransmit())
		_instrument.send (_mc);
}

void Part::silence() {
	if (!_mc)
		return;
	_mc->allNotesOff();
	memset (_actives, 0, sizeof (_actives));
}

////////////////////////////////////////
//
// Some more IMuseInternal stuff
//
////////////////////////////////////////

void IMuseInternal::midiTimerCallback (void *data) {
	MidiDriver *driver = (MidiDriver *) data;
	if (g_scumm->_imuse)
		g_scumm->_imuse->on_timer (driver);
}

void IMuseInternal::reallocateMidiChannels (MidiDriver *midi) {
	Part *part, *hipart;
	int i;
	byte hipri, lopri;
	Part *lopart;

	while (true) {
		hipri = 0;
		hipart = NULL;
		for (i = 32, part = _parts; i; i--, part++) {
			if (part->_player && part->_player->getMidiDriver() == midi &&
			    !part->_percussion && part->_on &&
				!part->_mc && part->_pri_eff >= hipri)
			{
				hipri = part->_pri_eff;
				hipart = part;
			}
		}

		if (!hipart)
			return;

		if ((hipart->_mc = midi->allocateChannel()) == NULL) {
			lopri = 255;
			lopart = NULL;
			for (i = 32, part = _parts; i; i--, part++) {
				if (part->_mc && part->_mc->device() == midi && part->_pri_eff <= lopri) {
					lopri = part->_pri_eff;
					lopart = part;
				}
			}

			if (lopart == NULL || lopri >= hipri)
				return;
			lopart->off();

			if ((hipart->_mc = midi->allocateChannel()) == NULL)
				return;
		}
		hipart->sendAll();
	}
}

void IMuseInternal::setGlobalAdlibInstrument (byte slot, byte *data) {
	if (slot < 32) {
		_global_adlib_instruments[slot].adlib (data);
	}
}

void IMuseInternal::copyGlobalAdlibInstrument (byte slot, Instrument *dest) {
	if (slot >= 32)
		return;
	_global_adlib_instruments[slot].copy_to (dest);
}

////////////////////////////////////////////////////////////
//
// IMuse implementation
//
// IMuse actually serves as a concurency monitor front-end
// to IMuseInternal and ensures that only one thread
// accesses the object at a time. This is necessary to
// prevent scripts and the MIDI parser from yanking objects
// out from underneath each other.
//
////////////////////////////////////////////////////////////

IMuse::IMuse (OSystem *system, IMuseInternal *target) : _system (system), _target (target) { _mutex = system->create_mutex(); }
IMuse::~IMuse() { if (_mutex) _system->delete_mutex (_mutex); if (_target) delete _target; }
inline void IMuse::in() { _system->lock_mutex (_mutex); }
inline void IMuse::out() { _system->unlock_mutex (_mutex); }

void IMuse::on_timer (MidiDriver *midi) { in(); _target->on_timer (midi); out(); }
void IMuse::pause(bool paused) { in(); _target->pause (paused); out(); }
int IMuse::save_or_load(Serializer *ser, Scumm *scumm) { in(); int ret = _target->save_or_load (ser, scumm); out(); return ret; }
int IMuse::set_music_volume(uint vol) { in(); int ret = _target->set_music_volume (vol); out(); return ret; }
int IMuse::get_music_volume() { in(); int ret = _target->get_music_volume(); out(); return ret; }
int IMuse::set_master_volume(uint vol) { in(); int ret = _target->set_master_volume (vol); out(); return ret; }
int IMuse::get_master_volume() { in(); int ret = _target->get_master_volume(); out(); return ret; }
bool IMuse::startSound(int sound) { in(); bool ret = _target->startSound (sound); out(); return ret; }
int IMuse::stopSound(int sound) { in(); int ret = _target->stopSound (sound); out(); return ret; }
int IMuse::stop_all_sounds() { in(); int ret = _target->stop_all_sounds(); out(); return ret; }
int IMuse::getSoundStatus(int sound) { in(); int ret = _target->getSoundStatus (sound); out(); return ret; }
bool IMuse::get_sound_active(int sound) { in(); bool ret = _target->get_sound_active (sound); out(); return ret; }
int32 IMuse::doCommand(int a, int b, int c, int d, int e, int f, int g, int h) { in(); int32 ret = _target->doCommand (a,b,c,d,e,f,g,h); out(); return ret; }
int IMuse::clear_queue() { in(); int ret = _target->clear_queue(); out(); return ret; }
void IMuse::setBase(byte **base) { in(); _target->setBase (base); out(); }
uint32 IMuse::property(int prop, uint32 value) { in(); uint32 ret = _target->property (prop, value); out(); return ret; }
MidiDriver *IMuse::getMidiDriver() { in(); MidiDriver *ret = _target->getMidiDriver(); out(); return ret; }

// The IMuse::create method provides a front-end factory
// for creating IMuseInternal without exposing that class
// to the client.
IMuse *IMuse::create (OSystem *syst, MidiDriver *midi) {
	IMuseInternal *engine = IMuseInternal::create (syst, midi);
	return new IMuse (syst, engine);
}