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/*
* 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
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* 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 FFTFrame_h
#define FFTFrame_h
#include "AudioArray.h"
#if USE(GSTREAMER)
#include <gst/fft/gstfftf32.h>
#endif // USE(GSTREAMER)
#if USE(ACCELERATE)
#include <Accelerate/Accelerate.h>
#endif
#include <memory>
#include <wtf/Forward.h>
#include <wtf/UniqueArray.h>
namespace WebCore {
// Defines the interface for an "FFT frame", an object which is able to perform a forward
// and reverse FFT, internally storing the resultant frequency-domain data.
class FFTFrame {
WTF_MAKE_FAST_ALLOCATED;
public:
// The constructors, destructor, and methods up to the CROSS-PLATFORM section have platform-dependent implementations.
FFTFrame(unsigned fftSize);
FFTFrame(); // creates a blank/empty frame for later use with createInterpolatedFrame()
FFTFrame(const FFTFrame& frame);
~FFTFrame();
static void initialize();
void doFFT(const float* data);
void doInverseFFT(float* data);
void multiply(const FFTFrame& frame); // multiplies ourself with frame : effectively operator*=()
void scaleFFT(float factor);
AudioFloatArray& realData() { return m_realData; }
AudioFloatArray& imagData() { return m_imagData; }
const AudioFloatArray& realData() const { return m_realData; }
const AudioFloatArray& imagData() const { return m_imagData; }
static int minFFTSize();
static int maxFFTSize();
void print(); // for debugging
// CROSS-PLATFORM
// The remaining public methods have cross-platform implementations:
// Interpolates from frame1 -> frame2 as x goes from 0.0 -> 1.0
static std::unique_ptr<FFTFrame> createInterpolatedFrame(const FFTFrame& frame1, const FFTFrame& frame2, double x);
void doPaddedFFT(const float* data, size_t dataSize); // zero-padding with dataSize <= fftSize
double extractAverageGroupDelay();
void addConstantGroupDelay(double sampleFrameDelay);
unsigned fftSize() const { return m_FFTSize; }
unsigned log2FFTSize() const { return m_log2FFTSize; }
private:
unsigned m_FFTSize;
unsigned m_log2FFTSize;
void interpolateFrequencyComponents(const FFTFrame& frame1, const FFTFrame& frame2, double x);
#if USE(ACCELERATE)
DSPSplitComplex& dspSplitComplex() { return m_frame; }
DSPSplitComplex dspSplitComplex() const { return m_frame; }
static FFTSetup fftSetupForSize(unsigned fftSize);
FFTSetup m_FFTSetup;
DSPSplitComplex m_frame;
#endif
#if USE(GSTREAMER)
GstFFTF32* m_fft;
GstFFTF32* m_inverseFft;
UniqueArray<GstFFTF32Complex> m_complexData;
#endif // USE(GSTREAMER)
AudioFloatArray m_realData;
AudioFloatArray m_imagData;
};
} // namespace WebCore
#endif // FFTFrame_h
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