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      1 /*
      2  * Copyright (C) 2010 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
     14  *     its contributors may be used to endorse or promote products derived
     15  *     from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #ifndef FFTFrame_h
     30 #define FFTFrame_h
     31 
     32 #include "platform/PlatformExport.h"
     33 #include "platform/audio/AudioArray.h"
     34 #include "wtf/Forward.h"
     35 #include "wtf/PassOwnPtr.h"
     36 #include "wtf/Threading.h"
     37 
     38 #if OS(MACOSX)
     39 #include <Accelerate/Accelerate.h>
     40 #elif USE(WEBAUDIO_OPENMAX_DL_FFT)
     41 #include <dl/sp/api/omxSP.h>
     42 #elif USE(WEBAUDIO_FFMPEG)
     43 struct RDFTContext;
     44 #elif USE(WEBAUDIO_IPP)
     45 #include <ipps.h>
     46 #endif
     47 
     48 namespace blink {
     49 
     50 // Defines the interface for an "FFT frame", an object which is able to perform a forward
     51 // and reverse FFT, internally storing the resultant frequency-domain data.
     52 
     53 class PLATFORM_EXPORT FFTFrame {
     54 public:
     55     // The constructors, destructor, and methods up to the CROSS-PLATFORM section have platform-dependent implementations.
     56 
     57     FFTFrame(unsigned fftSize);
     58     FFTFrame(); // creates a blank/empty frame for later use with createInterpolatedFrame()
     59     FFTFrame(const FFTFrame& frame);
     60     ~FFTFrame();
     61 
     62     static void initialize();
     63     static void cleanup();
     64     void doFFT(const float* data);
     65     void doInverseFFT(float* data);
     66 
     67     float* realData() const { return const_cast<float*>(m_realData.data()); }
     68     float* imagData() const { return const_cast<float*>(m_imagData.data()); }
     69 
     70     unsigned fftSize() const { return m_FFTSize; }
     71     unsigned log2FFTSize() const { return m_log2FFTSize; }
     72 
     73     // CROSS-PLATFORM
     74     // The remaining public methods have cross-platform implementations:
     75 
     76     // Interpolates from frame1 -> frame2 as x goes from 0.0 -> 1.0
     77     static PassOwnPtr<FFTFrame> createInterpolatedFrame(const FFTFrame& frame1, const FFTFrame& frame2, double x);
     78     void doPaddedFFT(const float* data, size_t dataSize); // zero-padding with dataSize <= fftSize
     79     double extractAverageGroupDelay();
     80     void addConstantGroupDelay(double sampleFrameDelay);
     81     void multiply(const FFTFrame&); // multiplies ourself with frame : effectively operator*=()
     82 
     83 #ifndef NDEBUG
     84     void print(); // for debugging
     85 #endif
     86 
     87 private:
     88     void interpolateFrequencyComponents(const FFTFrame& frame1, const FFTFrame& frame2, double x);
     89 
     90     unsigned m_FFTSize;
     91     unsigned m_log2FFTSize;
     92     AudioFloatArray m_realData;
     93     AudioFloatArray m_imagData;
     94 
     95 #if OS(MACOSX)
     96     DSPSplitComplex& dspSplitComplex() { return m_frame; }
     97     DSPSplitComplex dspSplitComplex() const { return m_frame; }
     98     static FFTSetup fftSetupForSize(unsigned fftSize);
     99     static FFTSetup* fftSetups;
    100     FFTSetup m_FFTSetup;
    101     DSPSplitComplex m_frame;
    102 #elif USE(WEBAUDIO_FFMPEG)
    103     static RDFTContext* contextForSize(unsigned fftSize, int trans);
    104     RDFTContext* m_forwardContext;
    105     RDFTContext* m_inverseContext;
    106     float* getUpToDateComplexData();
    107     AudioFloatArray m_complexData;
    108 #elif USE(WEBAUDIO_IPP)
    109     Ipp8u* m_buffer;
    110     IppsDFTSpec_R_32f* m_DFTSpec;
    111     float* getUpToDateComplexData();
    112     AudioFloatArray m_complexData;
    113 #elif USE(WEBAUDIO_OPENMAX_DL_FFT)
    114     static OMXFFTSpec_R_F32* contextForSize(unsigned log2FFTSize);
    115     OMXFFTSpec_R_F32* m_forwardContext;
    116     OMXFFTSpec_R_F32* m_inverseContext;
    117     AudioFloatArray m_complexData;
    118 #endif
    119 };
    120 
    121 } // namespace blink
    122 
    123 #endif // FFTFrame_h
    124