Change members's order and combine duplicated method for FFTFrame.

Source/platform/audio/ffmpeg/FFTFrameFFMPEG.cpp

 /*
  * Copyright (C) 2011 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 34 matching lines @@
 namespace blink {
 
 #if ENABLE(ASSERT)
 const int kMaxFFTPow2Size = 24;
 #endif
 
 // Normal constructor: allocates for a given fftSize.
 FFTFrame::FFTFrame(unsigned fftSize)
     : m_FFTSize(fftSize)
     , m_log2FFTSize(static_cast<unsigned>(log2(fftSize)))
+    , m_realData(fftSize / 2)
+    , m_imagData(fftSize / 2)
     , m_forwardContext(0)
     , m_inverseContext(0)
     , m_complexData(fftSize)
-    , m_realData(fftSize / 2)
-    , m_imagData(fftSize / 2)
 {
     // We only allow power of two.
     ASSERT(1UL << m_log2FFTSize == m_FFTSize);
 
     m_forwardContext = contextForSize(fftSize, DFT_R2C);
     m_inverseContext = contextForSize(fftSize, IDFT_C2R);
 }
 
 // Creates a blank/empty frame (interpolate() must later be called).
 FFTFrame::FFTFrame()
     : m_FFTSize(0)
     , m_log2FFTSize(0)
     , m_forwardContext(0)
     , m_inverseContext(0)
 {
 }
 
 // Copy constructor.
 FFTFrame::FFTFrame(const FFTFrame& frame)
     : m_FFTSize(frame.m_FFTSize)
     , m_log2FFTSize(frame.m_log2FFTSize)
+    , m_realData(frame.m_FFTSize / 2)
+    , m_imagData(frame.m_FFTSize / 2)
     , m_forwardContext(0)
     , m_inverseContext(0)
     , m_complexData(frame.m_FFTSize)
-    , m_realData(frame.m_FFTSize / 2)
-    , m_imagData(frame.m_FFTSize / 2)
 {
     m_forwardContext = contextForSize(m_FFTSize, DFT_R2C);
     m_inverseContext = contextForSize(m_FFTSize, IDFT_C2R);
 
     // Copy/setup frame data.
     unsigned nbytes = sizeof(float) * (m_FFTSize / 2);
     memcpy(realData(), frame.realData(), nbytes);
     memcpy(imagData(), frame.imagData(), nbytes);
 }
 
@@ skipping 42 matching lines @@
     // Compute inverse transform.
     av_rdft_calc(m_inverseContext, interleavedData);
 
     // Scale so that a forward then inverse FFT yields exactly the original data. For some reason
     // av_rdft_calc above returns values that are half of what I expect. Hence make the scale factor
     // twice as large to compensate for that.
     const float scale = 2.0 / m_FFTSize;
     VectorMath::vsmul(interleavedData, 1, &scale, data, 1, m_FFTSize);
 }
 
-float* FFTFrame::realData() const
-{
-    return const_cast<float*>(m_realData.data());
-}
-
-float* FFTFrame::imagData() const
-{
-    return const_cast<float*>(m_imagData.data());
-}
-
 float* FFTFrame::getUpToDateComplexData()
 {
     // FIXME: if we can't completely get rid of this method, SSE
     // optimization could be considered if it shows up hot on profiles.
     int len = m_FFTSize / 2;
     const float* real = m_realData.data();
     const float* imag = m_imagData.data();
     float* c = m_complexData.data();
     for (int i = 0; i < len; ++i) {
         int baseComplexIndex = 2 * i;
@@ skipping 14 matching lines @@
 
     RDFTContext* context = av_rdft_init(pow2size, (RDFTransformType)trans);
     return context;
 }
 
 } // namespace blink
 
 #endif // USE(WEBAUDIO_FFMPEG)
 
 #endif // ENABLE(WEB_AUDIO)