Added music parser for special format of

old-style MT-32 'RO' resources.

svn-id: r9683

1 files changed, 120 insertions, 0 deletions

diff --git a/scumm/midiparser_ro.cpp b/scumm/midiparser_ro.cpp
new file mode 100644
index 0000000000..67d61a82f3
--- /dev/null
+++ b/scumm/midiparser_ro.cpp
@@ -0,0 +1,120 @@
+/* ScummVM - Scumm Interpreter
+ * 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 "sound/midiparser.h"
+#include "sound/mididrv.h"
+#include "common/util.h"
+
+
+//////////////////////////////////////////////////
+//
+// The Standard MIDI File version of MidiParser
+//
+//////////////////////////////////////////////////
+
+class MidiParser_RO : public MidiParser {
+protected:
+	void compressToType0();
+	void parseNextEvent (EventInfo &info);
+
+public:
+	bool loadMusic (byte *data, uint32 size);
+};
+
+
+
+//////////////////////////////////////////////////
+//
+// MidiParser_RO implementation
+//
+//////////////////////////////////////////////////
+
+void MidiParser_RO::parseNextEvent (EventInfo &info) {
+	info.delta = 0;
+	do {
+		info.start = _position._play_pos;
+		info.event = *(_position._play_pos++);
+		if (info.command() == 0xA) continue;
+
+		if (info.event == 0xF0) {
+			byte delay = *(_position._play_pos++);
+			info.delta += delay;
+			continue;
+		}
+		break;
+	} while (true);
+
+	// Seems to indicate EOT
+	if (info.event == 0)
+		info.event = 0xF0;
+	else if (info.event < 0x80)
+		return;
+
+	_position._running_status = info.event;
+	switch (info.command()) {
+	case 0xC:
+		info.basic.param1 = *(_position._play_pos++);
+		info.basic.param2 = 0;
+		break;
+
+	case 0x8: case 0x9: case 0xB:
+		info.basic.param1 = *(_position._play_pos++);
+		info.basic.param2 = *(_position._play_pos++);
+		if (info.command() == 0x9 && info.basic.param2 == 0)
+			info.event = info.channel() | 0x80;
+		info.length = 0;
+		break;
+
+	case 0xF: // End of Track messages
+		if (info.event == 0xFF)
+			_autoLoop = true;
+		info.event = 0xFF;
+		info.ext.type = 0x2F;
+		info.length = 0;
+		info.ext.data = 0;
+		break;
+	}
+}
+
+bool MidiParser_RO::loadMusic (byte *data, uint32 size) {
+	unloadMusic();
+	byte *pos = data;
+
+	if (memcmp (pos, "RO", 2)) {
+		printf ("Warning: 'RO' header expected but found '%c%c' instead.\n", pos[0], pos[1]);
+		return false;
+	}
+
+	_num_tracks = 1;
+	_ppqn = 120;
+	_tracks[0] = pos + 2;
+
+	// Note that we assume the original data passed in
+	// will persist beyond this call, i.e. we do NOT
+	// copy the data to our own buffer. Take warning....
+	resetTracking();
+	setTempo (500000);
+	setTrack (0);
+	return true;
+}
+
+MidiParser *MidiParser_createRO() { return new MidiParser_RO; }