Explaining odd hacks with a comment is usually a good idea :-)

svn-id: r12875

1 files changed, 7 insertions, 2 deletions

diff --git a/scumm/imuse_digi/dimuse.cpp b/scumm/imuse_digi/dimuse.cpp
index ee1e23669a..b07e60870a 100644
--- a/scumm/imuse_digi/dimuse.cpp
+++ b/scumm/imuse_digi/dimuse.cpp
@@ -296,8 +296,13 @@ void IMuseDigital::startSound(int soundId, const char *soundName, int soundType,
 				assert(channels == 1 || channels == 2);
 				assert(0 < freq && freq <= 65535);
 
-				freq /= 25;
-				freq *= 25;
+				// Round the frequency to a multiple of 25. This is done to 
+				// ensure we don't run into data under-/overflows (this is a
+				// design limitation of the current IMuseDigital code, which
+				// pushes data 'blindly' into the mixer, instead of providing
+				// a pull based interface, i.e. a custom AudioInputStream
+				// subclass).
+				freq -= (fraq % 25);
 
 				_track[l].iteration = _track[l].pullSize = freq * channels;