Support concatenated spatialization data

Source/WebCore/platform/audio/HRTFElevation.cpp

 /*
  * Copyright (C) 2010 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 44 matching lines @@
 // Total number of components of an HRTF database.
 const size_t TotalNumberOfResponses = 240;
 
 // Number of frames in an individual impulse response.
 const size_t ResponseFrameSize = 256;
 
 // Sample-rate of the spatialization impulse responses as stored in the resource file.
 // The impulse responses may be resampled to a different sample-rate (depending on the audio hardware) when they are loaded.
 const float ResponseSampleRate = 44100;
 
-#if USE(WEBAUDIO_GSTREAMER)
+// Loading up individual spatialization impulse responses is very slow on Android. Use the
+// concatenated response file to speed it up.

[Chris Rogers, 2013/04/17 22:36:56]

Comment adds little value, please remove.

+#if USE(WEBAUDIO_GSTREAMER) || OS(ANDROID)

[Chris Rogers, 2013/04/17 22:36:56]

I don't think this should be Android-specific since all operating systems can
benefit.

 #define USE_CONCATENATED_IMPULSE_RESPONSES
 #endif
 
 #ifdef USE_CONCATENATED_IMPULSE_RESPONSES
 // Lazily load a concatenated HRTF database for given subject and store it in a
 // local hash table to ensure quick efficient future retrievals.
 static AudioBus* getConcatenatedImpulseResponsesForSubject(const String& subjectName)
 {
     typedef HashMap<String, AudioBus*> AudioBusMap;
     DEFINE_STATIC_LOCAL(AudioBusMap, audioBusMap, ());
@@ skipping 270 matching lines @@
 void HRTFElevation::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
 {
     MemoryClassInfo info(memoryObjectInfo, this, PlatformMemoryTypes::AudioSharedData);
     info.addMember(m_kernelListL, "kernelListL");
     info.addMember(m_kernelListR, "kernelListR");
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)