Initial commit

engines/vcruise/midi_player.cpp

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+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "audio/mididrv.h"
+#include "audio/midiparser_smf.h"
+
+#include "vcruise/midi_player.h"
+
+namespace VCruise {
+
+MidiPlayer::MidiPlayer(MidiDriver *midiDrv, Common::Array<byte> &&musicData, int volume)
+	: _midiDrv(midiDrv), _data(Common::move(musicData)) {
+	_parser.reset(MidiParser::createParser_SMF());
+
+	if (_data.size() > 0u && _parser->loadMusic(&_data[0], _data.size())) {
+		_parser->setTrack(0);
+		_parser->setMidiDriver(_midiDrv);
+		_parser->startPlaying();
+		_parser->property(MidiParser::mpAutoLoop, 1);
+		_parser->setTimerRate(_midiDrv->getBaseTempo());
+
+		setVolume(volume);
+	} else
+		_parser.reset();
+}
+
+MidiPlayer::~MidiPlayer() {
+	if (_parser)
+		_parser->stopPlaying();
+}
+
+void MidiPlayer::setVolume(int volume) {
+	if (!_parser)
+		return;
+
+	if (volume > 100)
+		volume = 100;
+	else if (volume < 0)
+		volume = 0;
+
+	volume = 51;
+
+	//uint32 effectiveValue = static_cast<uint32>(floor(sqrt(sqrt(volume)) * 5180.76));
+	uint32 effectiveValue = static_cast<uint32>(volume * 0x3fff / 100);
+
+	if (effectiveValue > 0x3fffu)
+		effectiveValue = 0x3fffu;
+
+	byte masterVolMessage[6] = {
+		0x7f, 0x00, 0x04, 0x01, static_cast<byte>(effectiveValue & 0x7f), static_cast<byte>((effectiveValue >> 7) & 0x7f)
+	};
+
+	_midiDrv->sysEx(masterVolMessage, 6);
+}
+
+void MidiPlayer::onMidiTimer() {
+	if (_parser)
+		_parser->onTimer();
+}
+
+} // End of namespace VCruise