support AudioUnit Generators without global Channel Info

[ardour.git] / libs / appleutility / CAAudioUnit.cpp

diff --git a/libs/appleutility/CAAudioUnit.cpp b/libs/appleutility/CAAudioUnit.cpp
index 131969b66c0e2537d42e8cad1adfceb04bc1e6d2..c1ab13454e839a3fad6a88b19e85472aeee70270 100644 (file)
--- a/libs/appleutility/CAAudioUnit.cpp
+++ b/libs/appleutility/CAAudioUnit.cpp
@@ -348,6 +348,42 @@ int    CAAudioUnit::GetChannelInfo (AUChannelInfo** chaninfo, UInt32& cnt)
                {
                        return 1;
                }
+               else if (Comp().Desc().IsGenerator() || Comp().Desc().IsMusicDevice()) {
+                       // directly query Bus Formats
+                       // Note that that these may refer to different subBusses
+                       // (eg. Kick, Snare,.. on a Drummachine)
+                       // eventually the Bus-Name for each configuration should be exposed
+                       // for the User to select..
+
+                       UInt32 elCountIn, elCountOut, elCount;
+
+                       if (GetElementCount (kAudioUnitScope_Input, elCountIn)) return 1;
+                       if (GetElementCount (kAudioUnitScope_Output, elCountOut)) return 1;
+
+                       elCount = std::max(elCountIn, elCountOut);
+
+                       *chaninfo = (AUChannelInfo*) malloc (sizeof (AUChannelInfo) * elCount);
+
+                       for (unsigned int i = 0; i < elCountIn; ++i) {
+                               UInt32 numChans;
+                               if (NumberChannels (kAudioUnitScope_Input, i, numChans)) return 1;
+                               (*chaninfo)[i].inChannels = numChans;
+                       }
+                       for (unsigned int i = elCountIn; i < elCount; ++i) {
+                               (*chaninfo)[i].inChannels = 0;
+                       }
+
+
+                       for (unsigned int i = 0; i < elCountOut; ++i) {
+                               UInt32 numChans;
+                               if (NumberChannels (kAudioUnitScope_Output, i, numChans)) return 1;
+                               (*chaninfo)[i].outChannels = numChans;
+                       }
+                       for (unsigned int i = elCountOut; i < elCount; ++i) {
+                               (*chaninfo)[i].outChannels = 0;
+                       }
+                       return 0;
+               }
                else 
                {
                        // the au should either really tell us about this