render: properly defined "out of bounds time" behavior with footage

If a user extends a clip beyond the footage's length, they can
choose whether they want a black frame, the last frame continued,
or for the footage to loop infinitely (same for extending earlier
than the start of footage).

app/render/job/footagejob.h

@@ -29,14 +29,17 @@ class FootageJob
 {
 public:
   FootageJob() :
-    type_(Track::kNone)
+    type_(Track::kNone),
+    loop_mode_(Footage::kLoopModeOff)
   {
   }
 
-  FootageJob(const QString& decoder, const QString& filename, Track::Type type) :
+  FootageJob(const QString& decoder, const QString& filename, Track::Type type, const rational& length, Footage::LoopMode loop_mode) :
     decoder_(decoder),
     filename_(filename),
-    type_(type)
+    type_(type),
+    length_(length),
+    loop_mode_(loop_mode)
   {
   }
 
@@ -85,6 +88,26 @@ public:
     cache_path_ = p;
   }
 
+  const rational& length() const
+  {
+    return length_;
+  }
+
+  void set_length(const rational& length)
+  {
+    length_ = length;
+  }
+
+  Footage::LoopMode loop_mode() const
+  {
+    return loop_mode_;
+  }
+
+  void set_loop_mode(Footage::LoopMode loop_mode)
+  {
+    loop_mode_ = loop_mode;
+  }
+
 private:
   QString decoder_;
 
@@ -98,6 +121,10 @@ private:
 
   QString cache_path_;
 
+  rational length_;
+
+  Footage::LoopMode loop_mode_;
+
 };
 
 }

app/render/renderprocessor.cpp

@@ -424,6 +424,7 @@ QVariant RenderProcessor::ProcessAudioFootage(const FootageJob &stream, const Ti
 
     SampleBufferPtr frame = decoder->RetrieveAudio(input_time, audio_params,
                                                    stream.cache_path(),
+                                                   stream.loop_mode(),
                                                    &IsCancelled());
 
     if (frame) {