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 35 #if OS(MACOSX) && !USE(WEBAUDIO_FFMPEG) 36 #define USE_ACCELERATE_FFT 1 37 #else 38 #define USE_ACCELERATE_FFT 0 39 #endif 40 41 #if USE_ACCELERATE_FFT 42 #include <Accelerate/Accelerate.h> 43 #endif 44 45 #if !USE_ACCELERATE_FFT 46 47 #if USE(WEBAUDIO_OPENMAX_DL_FFT) 48 #include <dl/sp/api/omxSP.h> 49 #elif USE(WEBAUDIO_FFMPEG) 50 struct RDFTContext; 51 #endif 52 53 #endif // !USE_ACCELERATE_FFT 54 55 #if USE(WEBAUDIO_IPP) 56 #include <ipps.h> 57 #endif // USE(WEBAUDIO_IPP) 58 59 #include "wtf/Forward.h" 60 #include "wtf/PassOwnPtr.h" 61 #include "wtf/Threading.h" 62 63 namespace WebCore { 64 65 // Defines the interface for an "FFT frame", an object which is able to perform a forward 66 // and reverse FFT, internally storing the resultant frequency-domain data. 67 68 class PLATFORM_EXPORT FFTFrame { 69 public: 70 // The constructors, destructor, and methods up to the CROSS-PLATFORM section have platform-dependent implementations. 71 72 FFTFrame(unsigned fftSize); 73 FFTFrame(); // creates a blank/empty frame for later use with createInterpolatedFrame() 74 FFTFrame(const FFTFrame& frame); 75 ~FFTFrame(); 76 77 static void initialize(); 78 static void cleanup(); 79 void doFFT(const float* data); 80 void doInverseFFT(float* data); 81 void multiply(const FFTFrame& frame); // multiplies ourself with frame : effectively operator*=() 82 83 float* realData() const; 84 float* imagData() const; 85 86 void print(); // for debugging 87 88 // CROSS-PLATFORM 89 // The remaining public methods have cross-platform implementations: 90 91 // Interpolates from frame1 -> frame2 as x goes from 0.0 -> 1.0 92 static PassOwnPtr<FFTFrame> createInterpolatedFrame(const FFTFrame& frame1, const FFTFrame& frame2, double x); 93 94 void doPaddedFFT(const float* data, size_t dataSize); // zero-padding with dataSize <= fftSize 95 double extractAverageGroupDelay(); 96 void addConstantGroupDelay(double sampleFrameDelay); 97 98 unsigned fftSize() const { return m_FFTSize; } 99 unsigned log2FFTSize() const { return m_log2FFTSize; } 100 101 private: 102 unsigned m_FFTSize; 103 unsigned m_log2FFTSize; 104 105 void interpolateFrequencyComponents(const FFTFrame& frame1, const FFTFrame& frame2, double x); 106 107 #if USE_ACCELERATE_FFT 108 DSPSplitComplex& dspSplitComplex() { return m_frame; } 109 DSPSplitComplex dspSplitComplex() const { return m_frame; } 110 111 static FFTSetup fftSetupForSize(unsigned fftSize); 112 113 static FFTSetup* fftSetups; 114 115 FFTSetup m_FFTSetup; 116 117 DSPSplitComplex m_frame; 118 AudioFloatArray m_realData; 119 AudioFloatArray m_imagData; 120 #else // !USE_ACCELERATE_FFT 121 122 #if USE(WEBAUDIO_FFMPEG) 123 static RDFTContext* contextForSize(unsigned fftSize, int trans); 124 125 RDFTContext* m_forwardContext; 126 RDFTContext* m_inverseContext; 127 128 float* getUpToDateComplexData(); 129 AudioFloatArray m_complexData; 130 AudioFloatArray m_realData; 131 AudioFloatArray m_imagData; 132 #endif // USE(WEBAUDIO_FFMPEG) 133 134 #if USE(WEBAUDIO_IPP) 135 Ipp8u* m_buffer; 136 IppsDFTSpec_R_32f* m_DFTSpec; 137 138 float* getUpToDateComplexData(); 139 AudioFloatArray m_complexData; 140 AudioFloatArray m_realData; 141 AudioFloatArray m_imagData; 142 #endif // USE(WEBAUDIO_IPP) 143 144 #if USE(WEBAUDIO_OPENMAX_DL_FFT) 145 static OMXFFTSpec_R_F32* contextForSize(unsigned log2FFTSize); 146 147 OMXFFTSpec_R_F32* m_forwardContext; 148 OMXFFTSpec_R_F32* m_inverseContext; 149 150 AudioFloatArray m_complexData; 151 AudioFloatArray m_realData; 152 AudioFloatArray m_imagData; 153 #endif 154 155 #endif // !USE_ACCELERATE_FFT 156 }; 157 158 } // namespace WebCore 159 160 #endif // FFTFrame_h 161
