LoopingSDIFFileReader.hxx

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00001 #ifndef _LoopingSDIFFileReader_
00002 #define _LoopingSDIFFileReader_
00003 
00004 #include "BufferedSDIFFileReader.hxx"
00005 #include "SDIFInConfig.hxx"
00006 #include "Frame.hxx"
00007 #include "SpectralPeakArray.hxx"
00008 #include "Spectrum.hxx"
00009 #include "SimpleLoopMetadata.hxx"
00010 
00011 #define DEFAULT_NUMBER_OF_CROSSFADE_FRAMES 100
00012 
00013 namespace CLAM
00014 {
00015 
00023 class LoopingSDIFFileReader : public BufferedSDIFFileReader
00024 {
00025 public:
00030         LoopingSDIFFileReader(const SDIFInConfig& argSDIFInConfig);
00031         
00032         ~LoopingSDIFFileReader();
00033 
00039         bool Configure(const SDIFInConfig& c);
00040 
00044         virtual Frame* ReadFrame();
00045 
00049         bool isLooping();
00050         
00054         void AddLoop(SimpleLoopMetadata& aSimpleLoop);
00055 
00060         void SetListOfLoops(std::vector<SimpleLoopMetadata>& theLoopList);
00061         
00065         void ClearLoops();
00066 
00070         std::vector<SimpleLoopMetadata>& GetListOfLoops();
00071 
00076         void Reset();
00077         
00078 private:
00082         void CrossfadeSpectralPeakArrays(SpectralPeakArray& sourceSpectralPeaks1,
00083                                                                         SpectralPeakArray& sourceSpectralPeaks2,
00084                                                                         SpectralPeakArray& targetSpectralPeaks,
00085                                                                         float crossfadeFactor);
00086         
00090         void CrossfadeResidualSpectrum(Spectrum& sourceSpectrum1,
00091                                                                         Spectrum& sourceSpectrum2,
00092                                                                         Spectrum& targetSpectrum,
00093                                                                         float crossfadeFactor);
00094 
00100         int ChooseLoopRandomly(int frameBufferPosition, int indexOfCurrentLoop);
00101         
00102         // every time ReadFrame() is called, the frame is copied to this singleton
00103         // object which is returned rather than the frame from the BufferedSDIFReader
00104         Frame* outgoingFrame;
00105         // number of frames that should be crossfaded before looping
00106         int numberOfCrossfadeFrames;
00107         // a list of loop points for this sample
00108         std::vector<SimpleLoopMetadata> listOfLoops;
00109         // the index of the loop that we are currently using
00110         int indexOfCurrentLoop;
00111 };
00112 
00113 } // end namespace CLAM
00114 
00115 #endif