SCI: stopping scripts from sending to unused channels manually (fixes sq1vga)

svn-id: r50060

3 files changed, 17 insertions, 6 deletions

diff --git a/engines/sci/sound/midiparser_sci.cpp b/engines/sci/sound/midiparser_sci.cpp
index 99468fe09c..1cfaadd36d 100644
--- a/engines/sci/sound/midiparser_sci.cpp
+++ b/engines/sci/sound/midiparser_sci.cpp
@@ -144,6 +144,20 @@ void MidiParser_SCI::unloadMusic() {
 	}
 }
 
+// this is used for scripts sending direct midi commands to us. we verify in that case that the channel is actually
+//  used
+void MidiParser_SCI::sendManuallyToDriver(uint32 b) {
+	byte midiChannel = b & 0xf;
+
+	if (!_channelUsed[midiChannel]) {
+		// scripts trying to send to unused channel
+		//  this happens at least in sq1vga right at the start, it's a script issue
+		return;
+	}
+
+	sendToDriver(b);
+}
+
 void MidiParser_SCI::sendToDriver(uint32 b) {
 	byte midiChannel = b & 0xf;
 
@@ -161,11 +175,7 @@ void MidiParser_SCI::sendToDriver(uint32 b) {
 		return;
 	// Channel remapping
 	int16 realChannel = _channelRemap[midiChannel];
-	if (realChannel == -1) {
-		// FIXME: Happens in SQ1VGA when the game starts
-		warning("Attempt to send to uninitialized channel %d", midiChannel);
-		return;
-	}
+	assert(realChannel != -1);
 
 	b = (b & 0xFFFFFFF0) | realChannel;
 	_driver->send(b);
diff --git a/engines/sci/sound/midiparser_sci.h b/engines/sci/sound/midiparser_sci.h
index abedafdde0..31a3b923fb 100644
--- a/engines/sci/sound/midiparser_sci.h
+++ b/engines/sci/sound/midiparser_sci.h
@@ -80,6 +80,7 @@ public:
 	void sendToDriver(byte status, byte firstOp, byte secondOp) {
 		sendToDriver(status | ((uint32)firstOp << 8) | ((uint32)secondOp << 16));
 	}
+	void sendManuallyToDriver(uint32 b);
 
 protected:
 	void parseNextEvent(EventInfo &info);
diff --git a/engines/sci/sound/music.cpp b/engines/sci/sound/music.cpp
index 6e12ac7409..8499b6da59 100644
--- a/engines/sci/sound/music.cpp
+++ b/engines/sci/sound/music.cpp
@@ -463,7 +463,7 @@ void SciMusic::sendMidiCommand(uint32 cmd) {
 
 void SciMusic::sendMidiCommand(MusicEntry *pSnd, uint32 cmd) {
 	if (pSnd->pMidiParser)
-		pSnd->pMidiParser->sendToDriver(cmd);
+		pSnd->pMidiParser->sendManuallyToDriver(cmd);
 	else
 		error("tried to cmdSendMidi on non midi slot (%04x:%04x)", PRINT_REG(pSnd->soundObj));
 }