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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 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
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_FFT_FRAME_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_FFT_FRAME_H_
#include <memory>
#include "build/build_config.h"
#include "third_party/blink/renderer/platform/audio/audio_array.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"
#include "third_party/blink/renderer/platform/wtf/threading.h"
#if defined(OS_MACOSX)
#include <Accelerate/Accelerate.h>
#elif defined(WTF_USE_WEBAUDIO_OPENMAX_DL_FFT)
#include <dl/sp/api/omxSP.h>
#elif defined(WTF_USE_WEBAUDIO_FFMPEG)
struct RDFTContext;
#endif
namespace blink {
// 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 PLATFORM_EXPORT FFTFrame {
USING_FAST_MALLOC(FFTFrame);
public:
// The constructors, destructor, and methods up to the CROSS-PLATFORM section
// have platform-dependent implementations.
FFTFrame(unsigned fft_size);
// creates a blank/empty frame for later use with createInterpolatedFrame()
FFTFrame();
FFTFrame(const FFTFrame& frame);
~FFTFrame();
static void Initialize();
static void Cleanup();
void DoFFT(const float* data);
void DoInverseFFT(float* data);
float* RealData() { return real_data_.Data(); }
const float* RealData() const { return real_data_.Data(); }
float* ImagData() { return imag_data_.Data(); }
const float* ImagData() const { return imag_data_.Data(); }
unsigned FftSize() const { return fft_size_; }
unsigned Log2FFTSize() const { return log2fft_size_; }
// 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);
// zero-padding with dataSize <= fftSize
void DoPaddedFFT(const float* data, size_t data_size);
double ExtractAverageGroupDelay();
void AddConstantGroupDelay(double sample_frame_delay);
// multiplies ourself with frame : effectively operator*=()
void Multiply(const FFTFrame&);
private:
void InterpolateFrequencyComponents(const FFTFrame& frame1,
const FFTFrame& frame2,
double x);
unsigned fft_size_;
unsigned log2fft_size_;
AudioFloatArray real_data_;
AudioFloatArray imag_data_;
#if defined(OS_MACOSX)
DSPSplitComplex& DspSplitComplex() { return frame_; }
DSPSplitComplex DspSplitComplex() const { return frame_; }
static FFTSetup FftSetupForSize(unsigned fft_size);
static FFTSetup* fft_setups_;
FFTSetup fft_setup_;
DSPSplitComplex frame_;
#elif defined(WTF_USE_WEBAUDIO_FFMPEG)
static RDFTContext* ContextForSize(unsigned fft_size, int trans);
RDFTContext* forward_context_;
RDFTContext* inverse_context_;
float* GetUpToDateComplexData();
AudioFloatArray complex_data_;
#elif defined(WTF_USE_WEBAUDIO_OPENMAX_DL_FFT)
static OMXFFTSpec_R_F32* ContextForSize(unsigned log2fft_size);
OMXFFTSpec_R_F32* forward_context_;
OMXFFTSpec_R_F32* inverse_context_;
AudioFloatArray complex_data_;
#endif
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_FFT_FRAME_H_