HRTF panner should handle the case of no loaded HRTF database

third_party/WebKit/Source/platform/audio/Panner.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 12 matching lines @@
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef Panner_h
 #define Panner_h
 
 #include "platform/PlatformExport.h"
+#include "platform/audio/AudioBus.h"
 #include "wtf/Allocator.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/build_config.h"
 #include <memory>
 
 namespace blink {
 
-class AudioBus;
 class HRTFDatabaseLoader;
 
 // Abstract base class for panning a mono or stereo source.
 
 class PLATFORM_EXPORT Panner {
     USING_FAST_MALLOC(Panner);
     WTF_MAKE_NONCOPYABLE(Panner);
 public:
     // This values are used in histograms and should not be renumbered or deleted.
     enum {
         PanningModelEqualPower = 0,
         PanningModelHRTF = 1
     };
 
     typedef unsigned PanningModel;
 
     static std::unique_ptr<Panner> create(PanningModel, float sampleRate, HRTFDatabaseLoader*);
 
     virtual ~Panner() { };
 
-    virtual void pan(double azimuth, double elevation, const AudioBus* inputBus, AudioBus* outputBus, size_t framesToProcess) = 0;
-    virtual void panWithSampleAccurateValues(double* azimuth, double* elevation, const AudioBus* inputBus, AudioBus* outputBus, size_t framesToProcess) = 0;
+    virtual void pan(double azimuth, double elevation, const AudioBus* inputBus, AudioBus* outputBus, size_t framesToProcess, AudioBus::ChannelInterpretation) = 0;
+    virtual void panWithSampleAccurateValues(double* azimuth, double* elevation, const AudioBus* inputBus, AudioBus* outputBus, size_t framesToProcess, AudioBus::ChannelInterpretation) = 0;
 
     virtual void reset() = 0;
 
     virtual double tailTime() const = 0;
     virtual double latencyTime() const = 0;
 
 protected:
     Panner(PanningModel model) : m_panningModel(model) { }
 
     PanningModel m_panningModel;
 };
 
 } // namespace blink
 
 #endif // Panner_h