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include/cinder/audio/FftProcessor.h

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00001 /*
00002  Copyright (c) 2009, The Barbarian Group
00003  All rights reserved.
00004 
00005  Redistribution and use in source and binary forms, with or without modification, are permitted provided that
00006  the following conditions are met:
00007 
00008     * Redistributions of source code must retain the above copyright notice, this list of conditions and
00009     the following disclaimer.
00010     * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
00011     the following disclaimer in the documentation and/or other materials provided with the distribution.
00012 
00013  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
00014  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
00015  PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
00016  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
00017  TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00018  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00019  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
00020  POSSIBILITY OF SUCH DAMAGE.
00021 */
00022 
00023 #pragma once
00024 
00025 #include "cinder/Cinder.h"
00026 #include "cinder/audio/PcmBuffer.h"
00027 
00028 namespace cinder { namespace audio {
00029 
00030 shared_ptr<float> calculateFft( Buffer32fRef aBuffer, uint16_t aBandCount );
00031 
00032 class FftProcessorImpl {
00033  public:
00034     FftProcessorImpl( uint16_t aBandCount );
00035     virtual ~FftProcessorImpl() {}
00036     virtual shared_ptr<float> process( const float * inBuffer ) = 0;
00037     uint16_t getBandCount() const { return mBandCount; }
00038  protected:
00039     uint16_t mBandCount;
00040 };
00041 
00042 typedef shared_ptr<class FftProcessor> FftProcessorRef;
00043 
00044 class FftProcessor {
00045  public:
00046     static const uint16_t   DEFAULT_BAND_COUNT = 512;
00047     
00048     static FftProcessorRef createRef( uint16_t aBandCount = DEFAULT_BAND_COUNT );
00049     
00050     shared_ptr<float> process( const float * inBuffer ) { return mImpl->process( inBuffer ); }
00051     uint16_t getBandCount() const { return mImpl->getBandCount(); }
00052  private:
00053     FftProcessor( uint16_t aBandCount );
00054     shared_ptr<FftProcessorImpl> mImpl;
00055 };
00056 
00057 }} //namespace