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1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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2 /*
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3 Constant-Q library
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4 Copyright (c) 2013-2014 Queen Mary, University of London
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5
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6 Permission is hereby granted, free of charge, to any person
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7 obtaining a copy of this software and associated documentation
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8 files (the "Software"), to deal in the Software without
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9 restriction, including without limitation the rights to use, copy,
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10 modify, merge, publish, distribute, sublicense, and/or sell copies
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11 of the Software, and to permit persons to whom the Software is
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12 furnished to do so, subject to the following conditions:
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13
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14 The above copyright notice and this permission notice shall be
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15 included in all copies or substantial portions of the Software.
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16
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17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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18 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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19 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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20 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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21 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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22 CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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23 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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24
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25 Except as contained in this notice, the names of the Centre for
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26 Digital Music; Queen Mary, University of London; and Chris Cannam
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27 shall not be used in advertising or otherwise to promote the sale,
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28 use or other dealings in this Software without prior written
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29 authorization.
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30 */
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31
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32 #ifndef CQINVERSE_H
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33 #define CQINVERSE_H
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34
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35 #include "CQBase.h"
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36 #include "CQKernel.h"
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37
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38 class Resampler;
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39 class FFTReal;
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40
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41 class CQInverse : public CQBase
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42 {
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43 public:
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44 CQInverse(double sampleRate,
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45 double minFreq, double maxFreq,
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46 int binsPerOctave);
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47 virtual ~CQInverse();
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48
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49 virtual double getSampleRate() const { return m_sampleRate; }
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50 virtual int getBinsPerOctave() const { return m_binsPerOctave; }
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51 virtual int getOctaves() const { return m_octaves; }
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52 virtual int getTotalBins() const { return m_octaves * m_binsPerOctave; }
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53 virtual int getColumnHop() const { return m_p.fftHop / m_p.atomsPerFrame; }
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54 virtual int getLatency() const { return m_outputLatency; }
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55 virtual double getMaxFrequency() const { return m_p.maxFrequency; }
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56 virtual double getMinFrequency() const; // actual min, not that passed to ctor
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57 virtual double getBinFrequency(int bin) const;
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58
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59 // Input is the format produced by ConstantQ class,
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60 // i.e. uninterpolated complex, not the real-valued stuff produced
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61 // by CQSpectrogram
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62
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63 RealSequence process(const ComplexBlock &);
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64 RealSequence getRemainingOutput();
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65
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66 private:
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67 double m_sampleRate;
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68 double m_maxFrequency;
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69 double m_minFrequency;
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70 int m_binsPerOctave;
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71 int m_octaves;
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72
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73 CQKernel *m_kernel;
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74 CQKernel::Properties m_p;
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75
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76 std::vector<Resampler *> m_upsamplers;
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77 std::vector<RealSequence> m_buffers;
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78 std::vector<RealSequence> m_olaBufs; // fixed-length, for overlap-add
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79
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80 int m_outputLatency;
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81
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82 FFTReal *m_fft;
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83
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84 void initialise();
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85 void processOctave(int octave, const ComplexBlock &block);
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86 void processOctaveColumn(int octave, const ComplexColumn &column);
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87 void overlapAddAndResample(int octave, const RealSequence &);
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88 RealSequence drawFromBuffers();
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89 };
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90
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91 #endif
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