1 files changed, 88 insertions, 0 deletions
diff --git a/engines/xeen/music.cpp b/engines/xeen/music.cpp
new file mode 100644
index 0000000000..f95683ac3d
--- /dev/null
+++ b/engines/xeen/music.cpp
@@ -0,0 +1,88 @@
+/* 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.
+ *
+ */
+
+#include "common/md5.h"
+#include "xeen/music.h"
+#include "xeen/xeen.h"
+#include "xeen/files.h"
+
+namespace Xeen {
+
+#define ADLIB_CHANNEL_COUNT 9
+#define CALLBACKS_PER_SECOND 60
+
+Music::Music(Audio::Mixer *mixer) : _mixer(mixer), _effectsData(nullptr) {
+	_mixer = mixer;
+	_opl = OPL::Config::create();
+	_opl->init();
+	_opl->start(new Common::Functor0Mem<void, Music>(this, &Music::onTimer), CALLBACKS_PER_SECOND);
+
+	loadEffectsData();
+}
+
+Music::~Music() {
+	_opl->stop();
+	delete _opl;
+	delete[] _effectsData;
+}
+
+void Music::loadEffectsData() {
+	File file("admus");
+	Common::String md5str = Common::computeStreamMD5AsString(file, 8192);
+	
+	if (md5str != "be8989a5e868913f0e53963046e3ea13")
+		error("Unknown music driver encountered");
+
+	// Load in the driver data
+	const int EFFECTS_OFFSET = 0x91D;
+	byte *effectsData = new byte[file.size() - EFFECTS_OFFSET];
+	file.seek(EFFECTS_OFFSET);
+	file.read(effectsData, file.size() - EFFECTS_OFFSET);
+	file.close();
+	_effectsData = effectsData;
+
+	// Extract the effects offsets
+	_effectsOffsets.resize(180);
+	for (int idx = 0; idx < 180; ++idx)
+		_effectsOffsets[idx] = READ_LE_UINT16(&effectsData[idx * 2]) - EFFECTS_OFFSET;
+}
+
+void Music::onTimer() {
+	Common::StackLock slock(_driverMutex);
+	update();
+	flush();
+}
+
+void Music::flush() {
+	Common::StackLock slock(_driverMutex);
+
+	while (!_queue.empty()) {
+		RegisterValue v = _queue.pop();
+		_opl->writeReg(v._regNum, v._value);
+	}
+}
+
+void Music::update() {
+	// TODO
+}
+
+} // End of namespace Xeen