AUDIO/MIDI: Add multisource support to QuickTime MIDI parser

Adds support for passing a source number to the MIDI driver to the QuickTime
MIDI parser.

audio/midiparser.h

@@ -492,7 +492,7 @@ public:
 
 	static MidiParser *createParser_SMF(int8 source = -1);
 	static MidiParser *createParser_XMIDI(XMidiCallbackProc proc = defaultXMidiCallback, void *refCon = 0, int source = -1);
-	static MidiParser *createParser_QT();
+	static MidiParser *createParser_QT(int8 source = -1);
 	static void timerCallback(void *data) { ((MidiParser *) data)->onTimer(); }
 };
 /** @} */

audio/midiparser_qt.cpp

@@ -21,6 +21,7 @@
  */
 
 #include "audio/midiparser_qt.h"
+#include "audio/mididrv.h"
 #include "common/debug.h"
 #include "common/memstream.h"
 
@@ -399,6 +400,22 @@ void MidiParser_QT::resetTracking() {
 	_partMap.clear();
 }
 
+void MidiParser_QT::sendToDriver(uint32 b) {
+	if (_source < 0) {
+		MidiParser::sendToDriver(b);
+	} else {
+		_driver->send(_source, b);
+	}
+}
+
+void MidiParser_QT::sendMetaEventToDriver(byte type, byte *data, uint16 length) {
+	if (_source < 0) {
+		MidiParser::sendMetaEventToDriver(type, data, length);
+	} else {
+		_driver->metaEvent(_source, type, data, length);
+	}
+}
+
 Common::QuickTimeParser::SampleDesc *MidiParser_QT::readSampleDesc(Track *track, uint32 format, uint32 descSize) {
 	if (track->codecType == CODEC_TYPE_MIDI) {
 		debug(0, "MIDI Codec FourCC '%s'", tag2str(format));
@@ -495,6 +512,6 @@ uint32 MidiParser_QT::readUint32() {
 	return value;
 }
 
-MidiParser *MidiParser::createParser_QT() {
+MidiParser *MidiParser::createParser_QT(int8 source) {
-	return new MidiParser_QT();
+	return new MidiParser_QT(source);
 }

audio/midiparser_qt.h

@@ -55,12 +55,12 @@
  */
 class MidiParser_QT : public MidiParser, public Common::QuickTimeParser {
 public:
-	MidiParser_QT() {}
+	MidiParser_QT(int8 source = -1) : _source(source) {}
 	~MidiParser_QT() {}
 
 	// MidiParser
-	bool loadMusic(byte *data, uint32 size);
+	bool loadMusic(byte *data, uint32 size) override;
-	void unloadMusic();
+	void unloadMusic() override;
 
 	/**
 	 * Load the MIDI from a 'Tune' resource
@@ -79,11 +79,23 @@ public:
 
 protected:
 	// MidiParser
-	void parseNextEvent(EventInfo &info);
+	void parseNextEvent(EventInfo &info) override;
-	void resetTracking();
+	void resetTracking() override;
+
+	void sendToDriver(uint32 b) override;
+	void sendMetaEventToDriver(byte type, byte *data, uint16 length) override;
 
 	// QuickTimeParser
-	SampleDesc *readSampleDesc(Track *track, uint32 format, uint32 descSize);
+	SampleDesc *readSampleDesc(Track *track, uint32 format, uint32 descSize) override;
+
+	/**
+	 * The source number to use when sending MIDI messages to the driver.
+	 * When using multiple sources, use source 0 and higher. This must be
+	 * used when source volume or channel locking is used.
+	 * By default this is -1, which means the parser is the only source
+	 * of MIDI messages and multiple source functionality is disabled.
+	 */
+	int8 _source;
 
 private:
 	struct MIDITrackInfo {