CoreAudio/PublicUtility/CASpectralProcessor.h
/* |
File: CASpectralProcessor.h |
Abstract: Part of CoreAudio Utility Classes |
Version: 1.1 |
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple |
Inc. ("Apple") in consideration of your agreement to the following |
terms, and your use, installation, modification or redistribution of |
this Apple software constitutes acceptance of these terms. If you do |
not agree with these terms, please do not use, install, modify or |
redistribute this Apple software. |
In consideration of your agreement to abide by the following terms, and |
subject to these terms, Apple grants you a personal, non-exclusive |
license, under Apple's copyrights in this original Apple software (the |
"Apple Software"), to use, reproduce, modify and redistribute the Apple |
Software, with or without modifications, in source and/or binary forms; |
provided that if you redistribute the Apple Software in its entirety and |
without modifications, you must retain this notice and the following |
text and disclaimers in all such redistributions of the Apple Software. |
Neither the name, trademarks, service marks or logos of Apple Inc. may |
be used to endorse or promote products derived from the Apple Software |
without specific prior written permission from Apple. Except as |
expressly stated in this notice, no other rights or licenses, express or |
implied, are granted by Apple herein, including but not limited to any |
patent rights that may be infringed by your derivative works or by other |
works in which the Apple Software may be incorporated. |
The Apple Software is provided by Apple on an "AS IS" basis. APPLE |
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION |
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS |
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND |
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS. |
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL |
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, |
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED |
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), |
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE |
POSSIBILITY OF SUCH DAMAGE. |
Copyright (C) 2014 Apple Inc. All Rights Reserved. |
*/ |
#ifndef _SpectralProcesor_H_ |
#define _SpectralProcesor_H_ |
#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__) |
#include <CoreAudio/CoreAudioTypes.h> |
#include <CoreFoundation/CoreFoundation.h> |
#else |
#include <CoreAudioTypes.h> |
#include <CoreFoundation.h> |
#endif |
#include <Accelerate/Accelerate.h> |
#include "CAAutoDisposer.h" |
struct SpectralBufferList |
{ |
UInt32 mNumberSpectra; |
DSPSplitComplex mDSPSplitComplex[1]; |
}; |
class CASpectralProcessor |
{ |
public: |
CASpectralProcessor(UInt32 inFFTSize, UInt32 inHopSize, UInt32 inNumChannels, UInt32 inMaxFrames); |
virtual ~CASpectralProcessor(); |
void Reset(); |
void Process(UInt32 inNumFrames, AudioBufferList* inInput, AudioBufferList* outOutput); |
typedef void (*SpectralFunction)(SpectralBufferList* inSpectra, void* inUserData); |
void SetSpectralFunction(SpectralFunction inFunction, void* inUserData); |
UInt32 FFTSize() const { return mFFTSize; } |
UInt32 MaxFrames() const { return mMaxFrames; } |
UInt32 NumChannels() const { return mNumChannels; } |
UInt32 HopSize() const { return mHopSize; } |
Float32* Window() const { return mWindow; } |
void HanningWindow(); // set up a hanning window |
void SineWindow(); |
void GetFrequencies(Float32* freqs, Float32 sampleRate); // only for processed forward |
void GetMagnitude(AudioBufferList* inCopy, Float32* min, Float32* max); // only for processed forward |
virtual bool ProcessForwards(UInt32 inNumFrames, AudioBufferList* inInput); |
bool ProcessBackwards(UInt32 inNumFrames, AudioBufferList* outOutput); |
void PrintSpectralBufferList(); |
protected: |
void CopyInput(UInt32 inNumFrames, AudioBufferList* inInput); |
void CopyInputToFFT(); |
void DoWindowing(); |
void DoFwdFFT(); |
void DoInvFFT(); |
void OverlapAddOutput(); |
void CopyOutput(UInt32 inNumFrames, AudioBufferList* inOutput); |
void ProcessSpectrum(UInt32 inFFTSize, SpectralBufferList* inSpectra); |
UInt32 mFFTSize; |
UInt32 mHopSize; |
UInt32 mNumChannels; |
UInt32 mMaxFrames; |
UInt32 mLog2FFTSize; |
UInt32 mFFTMask; |
UInt32 mFFTByteSize; |
UInt32 mIOBufSize; |
UInt32 mIOMask; |
UInt32 mInputSize; |
UInt32 mInputPos; |
UInt32 mOutputPos; |
UInt32 mInFFTPos; |
UInt32 mOutFFTPos; |
FFTSetup mFFTSetup; |
CAAutoFree<Float32> mWindow; |
struct SpectralChannel |
{ |
CAAutoFree<Float32> mInputBuf; // log2ceil(FFT size + max frames) |
CAAutoFree<Float32> mOutputBuf; // log2ceil(FFT size + max frames) |
CAAutoFree<Float32> mFFTBuf; // FFT size |
CAAutoFree<Float32> mSplitFFTBuf; // FFT size |
}; |
CAAutoArrayDelete<SpectralChannel> mChannels; |
CAAutoFree<SpectralBufferList> mSpectralBufferList; |
SpectralFunction mSpectralFunction; |
void *mUserData; |
}; |
#endif |
Copyright © 2014 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2014-07-08