diff src/feature_extractor.hpp @ 0:add35537fdbb tip

Initial import

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/feature_extractor.hpp	Thu Aug 25 11:05:55 2011 +0100
@@ -0,0 +1,99 @@
+//  Copyright 2011, Ian Hobson.
+//
+//  This file is part of gpsynth.
+//
+//  gpsynth is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  gpsynth is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with gpsynth in the file COPYING. 
+//  If not, see http://www.gnu.org/licenses/.
+
+// FeatureExtractor - responsible for managing the retrieval of features from 
+// audio data. Caches feature data to avoid recalculations when accessing
+// different features that have the same dependencies.
+
+#pragma once
+
+#include "mfcc_analyzer.hpp"
+#include "spectrum_analyzer.hpp"
+
+#include <complex>
+#include <vector>
+
+namespace dsp {
+
+typedef double Value;
+typedef std::vector<Value> ValueList;
+typedef std::complex<Value> ComplexValue;
+typedef std::vector<ComplexValue> ComplexValueList;
+
+class FeatureExtractor {
+  std::string file_path_;
+  ValueList window_;
+  ValueList frame_;
+  ValueList file_data_;
+  ValueList bin_frequencies_;
+  Value bin_size_;
+  std::vector<ComplexValueList> spectrum_;
+  std::vector<ValueList> magnitude_spectrum_;
+  std::vector<ValueList> log_magnitude_spectrum_;
+  std::vector<ValueList> mfccs_;
+  std::vector<ValueList> delta_mfccs_;
+  std::vector<ValueList> double_delta_mfccs_;
+  std::vector<ValueList> spectral_flux_;
+  ValueList pitch_;
+  ValueList spectral_centroid_;
+  ValueList spectral_spread_;
+  ValueList energy_;
+  
+  int frames_;
+  int window_size_;
+  int hop_size_;
+  Value sample_rate_;
+  
+  dsp::SpectrumAnalyzer spectrum_analyzer_;
+  dsp::MFCCAnalyzer mfcc_analyzer_;
+  
+public:
+  FeatureExtractor(const std::string& file_path = "",
+                   int frame_size = 2048,
+                   int hop_size = 512);
+  
+  void LoadFile(const std::string& file_path);
+  void ClearCaches();
+  
+  int Frames() const { return frames_; }
+  
+  int WindowSize() const { return window_size_; }
+  int HopSize() const { return hop_size_; }
+  
+  void SetWindowSize(int window_size);
+  void SetHopSize(int hop_size);
+  
+  Value Duration() const;
+  
+  const std::vector<ComplexValueList>& Spectrum();
+  const std::vector<ValueList>& MagnitudeSpectrum();
+  const std::vector<ValueList>& LogMagnitudeSpectrum();
+  const ValueList& Pitch();
+  const ValueList& SpectralCentroid();
+  const ValueList& SpectralSpread();
+  const std::vector<ValueList>& SpectralFlux();
+  const ValueList& Energy();
+  const std::vector<ValueList>& MFCCs();
+  const std::vector<ValueList>& DeltaMFCCs();
+  const std::vector<ValueList>& DoubleDeltaMFCCs();
+  
+private:
+  void GenerateWindow();
+};
+
+} // dsp namespace