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[ardour.git] / libs / ardour / chan_mapping.cc

diff --git a/libs/ardour/chan_mapping.cc b/libs/ardour/chan_mapping.cc
index 0ca79af505d1f69ccf58b1008e8f77c84ea0be24..6386c2863b264a668121631b1bdf1c71071d9cb6 100644 (file)
--- a/libs/ardour/chan_mapping.cc
+++ b/libs/ardour/chan_mapping.cc
@@ -67,6 +67,26 @@ ChanMapping::get(DataType t, uint32_t from, bool* valid) const
        return m->second;
 }
 
+uint32_t
+ChanMapping::get_src(DataType t, uint32_t to, bool* valid) const
+{
+       Mappings::const_iterator tm = _mappings.find(t);
+       if (tm == _mappings.end()) {
+               if (valid) { *valid = false; }
+               return -1;
+       }
+       for (TypeMapping::const_iterator i = tm->second.begin(); i != tm->second.end(); ++i) {
+               if (i->second == to) {
+                       if (valid) { *valid = true; }
+                       return i->first;
+               }
+       }
+       if (valid) { *valid = false; }
+       return -1;
+}
+
+
+
 void
 ChanMapping::set(DataType t, uint32_t from, uint32_t to)
 {