Absence of voice files is now automatically detected (bug #309)

git-svn-id: svn://svn.code.sf.net/p/sc2/code/trunk@1008 8092fc87-c524-0410-9efc-e669fe64eaf9

sc2/ChangeLog

@@ -1,4 +1,5 @@
 Changes towards version 0.3:
+- Absence of voice files is now automatically detected (bug #309) -Mika
 - Fixed Commander Hayes mouth movement before radioactives are given
   (bug #343) -Mika
 - Fix glitches in slylandro probe animation (bugs #398, #399), from Paxtez

sc2/src/sc2code/libs/sound/trackplayer.c

@@ -495,6 +495,15 @@ SpliceTrack (UNICODE *TrackName, UNICODE *TrackText, UNICODE *TimeStamp, void (*
 					//	last_chain->decoder->frequency,
 					//	last_chain->decoder->format);
 
+					if (last_chain->decoder->type == SOUNDDECODER_NULL &&
+						speechVolumeScale != 0.0f)
+					{
+						/* No voice ogg available so zeroing speech volume to
+						   ensure proper operation of oscilloscope and music fading */
+						speechVolumeScale = 0.0f;
+						fprintf (stderr, "SpliceTrack(): no voice ogg available so setting speech volume to zero\n");
+					}
+
 					sound_sample->length += last_chain->decoder->length;
 					if (! no_page_break)
 					{