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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"
39 #include <Accelerate/Accelerate.h>
40 #elif USE(WEBAUDIO_OPENMAX_DL_FFT)
41 #include <dl/sp/api/omxSP.h>
42 #elif USE(WEBAUDIO_FFMPEG)
44 #elif USE(WEBAUDIO_IPP)
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.
53 class PLATFORM_EXPORT FFTFrame {
55 // The constructors, destructor, and methods up to the CROSS-PLATFORM section have platform-dependent implementations.
57 FFTFrame(unsigned fftSize);
58 FFTFrame(); // creates a blank/empty frame for later use with createInterpolatedFrame()
59 FFTFrame(const FFTFrame& frame);
62 static void initialize();
63 static void cleanup();
64 void doFFT(const float* data);
65 void doInverseFFT(float* data);
67 float* realData() const { return const_cast<float*>(m_realData.data()); }
68 float* imagData() const { return const_cast<float*>(m_imagData.data()); }
70 unsigned fftSize() const { return m_FFTSize; }
71 unsigned log2FFTSize() const { return m_log2FFTSize; }
74 // The remaining public methods have cross-platform implementations:
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*=()
84 void print(); // for debugging
88 void interpolateFrequencyComponents(const FFTFrame& frame1, const FFTFrame& frame2, double x);
91 unsigned m_log2FFTSize;
92 AudioFloatArray m_realData;
93 AudioFloatArray m_imagData;
96 DSPSplitComplex& dspSplitComplex() { return m_frame; }
97 DSPSplitComplex dspSplitComplex() const { return m_frame; }
98 static FFTSetup fftSetupForSize(unsigned fftSize);
99 static FFTSetup* fftSetups;
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)
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;