Stub out VideoToolbox renderer

app/streaming/renderers/vt.cpp

@@ -0,0 +1,28 @@
+#include "vt.h"
+
+VTRenderer::VTRenderer()
+{
+
+}
+
+VTRenderer::~VTRenderer()
+{
+}
+
+bool VTRenderer::prepareDecoderContext(AVCodecContext*)
+{
+    /* Nothing to do */
+    return true;
+}
+
+bool VTRenderer::initialize(SDL_Window* window,
+                            int videoFormat,
+                            int width,
+                            int height)
+{
+    return false;
+}
+
+void VTRenderer::renderFrame(AVFrame* frame)
+{
+}