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author | Steve Block <steveblock@google.com> | 2011-05-06 11:45:16 +0100 |
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committer | Steve Block <steveblock@google.com> | 2011-05-12 13:44:10 +0100 |
commit | cad810f21b803229eb11403f9209855525a25d57 (patch) | |
tree | 29a6fd0279be608e0fe9ffe9841f722f0f4e4269 /Source/WebCore/platform/audio/FFTFrame.h | |
parent | 121b0cf4517156d0ac5111caf9830c51b69bae8f (diff) | |
download | external_webkit-cad810f21b803229eb11403f9209855525a25d57.zip external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.gz external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.bz2 |
Merge WebKit at r75315: Initial merge by git.
Change-Id: I570314b346ce101c935ed22a626b48c2af266b84
Diffstat (limited to 'Source/WebCore/platform/audio/FFTFrame.h')
-rw-r--r-- | Source/WebCore/platform/audio/FFTFrame.h | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/Source/WebCore/platform/audio/FFTFrame.h b/Source/WebCore/platform/audio/FFTFrame.h new file mode 100644 index 0000000..1a82ef0 --- /dev/null +++ b/Source/WebCore/platform/audio/FFTFrame.h @@ -0,0 +1,123 @@ +/* + * 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 Computer, 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 OS(DARWIN) +#include <Accelerate/Accelerate.h> +#endif + +#if !OS(DARWIN) && USE(WEBAUDIO_MKL) +#include "mkl_dfti.h" +#endif + +#include <wtf/PassOwnPtr.h> +#include <wtf/Platform.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 { +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 cleanup(); + void doFFT(float* data); + void doInverseFFT(float* data); + void multiply(const FFTFrame& frame); // multiplies ourself with frame : effectively operator*=() + + float* realData() const; + float* imagData() const; + + 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 PassOwnPtr<FFTFrame> createInterpolatedFrame(const FFTFrame& frame1, const FFTFrame& frame2, double x); + + void doPaddedFFT(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 OS(DARWIN) + DSPSplitComplex& dspSplitComplex() { return m_frame; } + DSPSplitComplex dspSplitComplex() const { return m_frame; } + + static FFTSetup fftSetupForSize(unsigned fftSize); + + static FFTSetup* fftSetups; + + FFTSetup m_FFTSetup; + + DSPSplitComplex m_frame; + AudioFloatArray m_realData; + AudioFloatArray m_imagData; +#endif // OS(DARWIN) +#if !OS(DARWIN) && USE(WEBAUDIO_MKL) + // Interleaves the planar real and imaginary data and returns a + // pointer to the resulting storage which can be used for in-place + // or out-of-place operations. FIXME: ideally all of the MKL + // routines would operate on planar data and this method would be + // removed. + float* getUpToDateComplexData(); + + static DFTI_DESCRIPTOR_HANDLE descriptorHandleForSize(unsigned fftSize); + + static DFTI_DESCRIPTOR_HANDLE* descriptorHandles; + + DFTI_DESCRIPTOR_HANDLE m_handle; + AudioFloatArray m_complexData; + AudioFloatArray m_realData; + AudioFloatArray m_imagData; +#endif // !OS(DARWIN) && USE(WEBAUDIO_MKL) +}; + +} // namespace WebCore + +#endif // FFTFrame_h |