Move utility functions for sample rate to AudioUtilities.

Source/platform/audio/HRTFPanner.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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 12 matching lines @@
  */
 
 #include "config.h"
 
 #if ENABLE(WEB_AUDIO)
 
 #include "platform/audio/HRTFPanner.h"
 
 #include <algorithm>
 #include "platform/audio/AudioBus.h"
+#include "platform/audio/AudioUtilities.h"
 #include "platform/audio/HRTFDatabase.h"
 #include "wtf/MathExtras.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 // The value of 2 milliseconds is larger than the largest delay which exists in any HRTFKernel from the default HRTFDatabase (0.0136 seconds).
 // We ASSERT the delay values used in process() with this value.
 const double MaxDelayTimeSeconds = 0.002;
 
@@ skipping 32 matching lines @@
 size_t HRTFPanner::fftSizeForSampleRate(float sampleRate)
 {
     // The HRTF impulse responses (loaded as audio resources) are 512 sample-frames @44.1KHz.
     // Currently, we truncate the impulse responses to half this size,
     // but an FFT-size of twice impulse response size is needed (for convolution).
     // So for sample rates around 44.1KHz an FFT size of 512 is good.
     // For different sample rates, the truncated response is resampled.
     // The resampled length is used to compute the FFT size by choosing a power of two that is
     // greater than or equal the resampled length. This power of two is doubled to get the actual FFT size.
 
-    ASSERT(sampleRate >= 3000 && sampleRate <= 192000);
+    ASSERT(AudioUtilities::isValidAudioBufferSampleRate(sampleRate));
 
     int truncatedImpulseLength = 256;
     double sampleRateRatio = sampleRate / 44100;
     double resampledLength = truncatedImpulseLength * sampleRateRatio;
 
     return 2 * (1 << static_cast<unsigned>(log2(resampledLength)));
 }
 
 void HRTFPanner::reset()
 {
@@ skipping 222 matching lines @@
 
 void HRTFPanner::trace(Visitor* visitor)
 {
     visitor->trace(m_databaseLoader);
     Panner::trace(visitor);
 }
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)