diff src/mfcc_analyzer.hpp @ 0:add35537fdbb tip

Initial import

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/mfcc_analyzer.hpp	Thu Aug 25 11:05:55 2011 +0100
@@ -0,0 +1,61 @@
+//  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/.
+
+// MFCCAnalyzer - extracts MFCCs from a provided magnitude spectrum
+
+#pragma once
+
+#include "fftw3.h"
+
+#include <vector>
+
+namespace dsp {
+
+class MFCCAnalyzer {  
+  fftw_plan dct_plan_;
+  int frame_size_;
+  double sample_rate_;
+  double frequency_min_;
+  double frequency_max_;
+  std::vector< std::vector<double> > mel_filters_;
+  int mel_bands_;
+  int number_of_mfccs_;
+  std::vector<double> mfccs_;
+  double* mel_bands_dct_in_;
+  double* mel_bands_dct_out_;
+  
+public:
+  MFCCAnalyzer(int frame_size,
+               int mel_bands,
+               int number_of_mfccs,
+               double frequency_min,
+               double frequency_max);
+  
+  ~MFCCAnalyzer();
+  
+  void SetSampleRate(double sample_rate);
+  
+  // extracts mfccs from a magnitude spectrum
+  const std::vector<double>& ExtractMFCCS(const std::vector<double>& spectrum);
+  
+private:
+  void InitializeMelDCT();
+  void InitializeFilters();  
+};
+
+} // dsp namespace