in compute_gains in case _speakers.n_tuples is 0. Prevent NaN gains if total power...

git-svn-id: svn://localhost/ardour2/branches/3.0@8218 d708f5d6-7413-0410-9779-e7cbd77b26cf

diff --git a/libs/ardour/vbap.cc b/libs/ardour/vbap.cc
index d727293b05ed4ac9337e53a7398e13ddc25adbd0..96fc1336fb45ffa1fcf180544cde8c51f1610ae3 100644 (file)
--- a/libs/ardour/vbap.cc
+++ b/libs/ardour/vbap.cc
@@ -56,7 +56,7 @@ string VBAPanner::name = X_("VBAP");
 
 VBAPanner::VBAPanner (Panner& parent, Evoral::Parameter param, Speakers& s)
        : StreamPanner (parent, param)
-       , _dirty (false)
+       , _dirty (true)
        , _speakers (VBAPSpeakers::instance (s))
 {
 }
@@ -65,12 +65,6 @@ VBAPanner::~VBAPanner ()
 {
 }
 
-void
-VBAPanner::mark_dirty ()
-{
-       _dirty = true;
-}
-
 void
 VBAPanner::update ()
 {
@@ -94,13 +88,16 @@ VBAPanner::compute_gains (double gains[3], int speaker_ids[3], int azi, int ele)
        azi_ele_to_cart (azi,ele, cartdir[0], cartdir[1], cartdir[2]);  
        big_sm_g = -100000.0;
 
+       gains[0] = gains[1] = gains[2] = 0;
+       speaker_ids[0] = speaker_ids[1] = speaker_ids[2] = 0;
+
        for (i = 0; i < _speakers.n_tuples(); i++) {
 
                small_g = 10000000.0;
 
                for (j = 0; j < _speakers.dimension(); j++) {
 
-                       gtmp[j]=0.0;
+                       gtmp[j] = 0.0;
 
                        for (k = 0; k < _speakers.dimension(); k++) {
                                gtmp[j] += cartdir[k] * _speakers.matrix(i)[j*_speakers.dimension()+k]; 
@@ -133,9 +130,11 @@ VBAPanner::compute_gains (double gains[3], int speaker_ids[3], int azi, int ele)
         
        power = sqrt (gains[0]*gains[0] + gains[1]*gains[1] + gains[2]*gains[2]);
 
-       gains[0] /= power; 
-       gains[1] /= power;
-       gains[2] /= power;
+       if (power > 0) {
+               gains[0] /= power; 
+               gains[1] /= power;
+               gains[2] /= power;
+       }
 
        _dirty = false;
 }