Move utility functions for sample rate to AudioUtilities.

Source/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 14 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 
 #if ENABLE(WEB_AUDIO)
 
 #include "platform/audio/HRTFElevation.h"
 
-#include <math.h>
-#include <algorithm>
 #include "platform/audio/AudioBus.h"
-#include "platform/audio/HRTFPanner.h"
+#include "platform/audio/AudioUtilities.h"
+#include "platform/audio/HRTFDatabase.h"
 #include "wtf/ThreadingPrimitives.h"
 #include "wtf/text/StringHash.h"
 
+#include <algorithm>
+#include <math.h>
+
 namespace blink {
 
 const unsigned HRTFElevation::AzimuthSpacing = 15;
 const unsigned HRTFElevation::NumberOfRawAzimuths = 360 / AzimuthSpacing;
 const unsigned HRTFElevation::InterpolationFactor = 8;
 const unsigned HRTFElevation::NumberOfTotalAzimuths = NumberOfRawAzimuths * InterpolationFactor;
 
 // Total number of components of an HRTF database.
 const size_t TotalNumberOfResponses = 240;
 
@@ skipping 107 matching lines @@
     bool isBusGood = responseLength == expectedLength && impulseResponse->numberOfChannels() == 2;
     ASSERT(isBusGood);
     if (!isBusGood)
         return false;
 
     AudioChannel* leftEarImpulseResponse = impulseResponse->channelByType(AudioBus::ChannelLeft);
     AudioChannel* rightEarImpulseResponse = impulseResponse->channelByType(AudioBus::ChannelRight);
 #endif
 
     // Note that depending on the fftSize returned by the panner, we may be truncating the impulse response we just loaded in.
-    const size_t fftSize = HRTFPanner::fftSizeForSampleRate(sampleRate);
+    const size_t fftSize = AudioUtilities::fftSizeForSampleRate(sampleRate);
     kernelL = HRTFKernel::create(leftEarImpulseResponse, fftSize, sampleRate);
     kernelR = HRTFKernel::create(rightEarImpulseResponse, fftSize, sampleRate);
 
     return true;
 }
 
 // The range of elevations for the IRCAM impulse responses varies depending on azimuth, but the minimum elevation appears to always be -45.
 //
 // Here's how it goes:
 static int maxElevations[] = {
@@ skipping 124 matching lines @@
     double frameDelay2R = m_kernelListR->at(azimuthIndex2)->frameDelay();
 
     // Linearly interpolate delays.
     frameDelayL = (1.0 - azimuthBlend) * frameDelayL + azimuthBlend * frameDelay2L;
     frameDelayR = (1.0 - azimuthBlend) * frameDelayR + azimuthBlend * frameDelay2R;
 }
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)