Initial commit

engines/ags/music.cpp

@@ -0,0 +1,94 @@
+/* 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 "ags/music.h"
+#include "ags/engine/main/main.h"
+#include "ags/globals.h"
+#include "audio/midiparser.h"
+
+namespace AGS {
+
+Music *g_music;
+
+Music::Music() {
+	g_music = this;
+	Audio::MidiPlayer::createDriver();
+
+	int ret = _driver->open();
+	if (ret == 0) {
+		if (_nativeMT32)
+			_driver->sendMT32Reset();
+		else
+			_driver->sendGMReset();
+
+		_driver->setTimerCallback(this, &timerCallback);
+	}
+}
+
+Music::~Music() {
+	stop();
+	g_music = nullptr;
+}
+
+void Music::sendToChannel(byte channel, uint32 b) {
+	if (!_channelsTable[channel]) {
+		_channelsTable[channel] = (channel == 9) ? _driver->getPercussionChannel() : _driver->allocateChannel();
+		// If a new channel is allocated during the playback, make sure
+		// its volume is correctly initialized.
+		if (_channelsTable[channel])
+			_channelsTable[channel]->volume(_channelsVolume[channel] * _masterVolume / 255);
+	}
+
+	if (_channelsTable[channel])
+		_channelsTable[channel]->send(b);
+}
+
+void Music::playMusic(Common::SeekableReadStream *midi, bool repeat) {
+	stop();
+
+	// Load MIDI resource data
+	int midiMusicSize = midi->size();
+
+	_midiData.resize(midi->size());
+	midi->read(&_midiData[0], midi->size());
+
+	MidiParser *parser = MidiParser::createParser_SMF();
+	if (parser->loadMusic(&_midiData[0], midiMusicSize)) {
+		parser->setTrack(0);
+		parser->setMidiDriver(this);
+		parser->setTimerRate(_driver->getBaseTempo());
+		parser->property(MidiParser::mpCenterPitchWheelOnUnload, 1);
+		parser->property(MidiParser::mpSendSustainOffOnNotesOff, true);
+
+		_parser = parser;
+
+		_isLooping = repeat;
+		_isPlaying = true;
+	} else {
+		delete parser;
+	}
+}
+
+void Music::seek(size_t offset) {
+	warning("TODO: Music::seek to offset %u", (uint32)offset);
+}
+
+} // End of namespace AGS