multicam: implement clip splitting

app/node/block/clip/clip.cpp

@@ -541,4 +541,14 @@ TimeRange ClipBlock::media_range() const
   return InputTimeAdjustment(kBufferIn, -1, TimeRange(0, length()));
 }
 
+MultiCamNode *ClipBlock::FindMulticam()
+{
+  auto v = FindInputNodesConnectedToInput<MultiCamNode>(NodeInput(this, kBufferIn));
+  if (v.empty()) {
+    return nullptr;
+  } else {
+    return v.first();
+  }
+}
+
 }

app/node/block/clip/clip.h

@@ -24,6 +24,7 @@
 #include "audio/audiovisualwaveform.h"
 #include "codec/decoder.h"
 #include "node/block/block.h"
+#include "node/input/multicam/multicamnode.h"
 #include "node/output/track/track.h"
 
 namespace olive {
@@ -197,6 +198,8 @@ public:
     SetStandardValue(kLoopModeInput, int(l));
   }
 
+  MultiCamNode *FindMulticam();
+
   static const QString kBufferIn;
   static const QString kMediaInInput;
   static const QString kSpeedInput;