spectrumanalyzer.h

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// ##########################################################################
// ####                                                                  ####
// ####                      RTP Audio Server Project                    ####
// ####                    ============================                  ####
// ####                                                                  ####
// #### Spectrum Analyzer                                                ####
// ####                                                                  ####
// ####           Copyright (C) 1999-2012 by Thomas Dreibholz            ####
// ####                                                                  ####
// #### Contact:                                                         ####
// ####    EMail: dreibh@iem.uni-due.de                                  ####
// ####    WWW:   https://www.nntb.no/~dreibh/rtpaudio                ####
// ####                                                                  ####
// #### ---------------------------------------------------------------- ####
// ####                                                                  ####
// #### This program 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.              ####
// ####                                                                  ####
// #### This program 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 this program.  If not, see                    ####
// #### <http://www.gnu.org/licenses/>.                                  ####
// ####                                                                  ####
// ##########################################################################
// $Id: spectrumanalyzer.h 1286 2011-12-18 13:43:16Z dreibh $


#ifndef SPECTRUMANALYZER_H
#define SPECTRUMANALYZER_H


#include "tdsystem.h"
#include "audiowriterinterface.h"
#include "synchronizable.h"
#include "fft.h"


class SpectrumAnalyzer : virtual public AudioWriterInterface,
                         public Synchronizable
{
   // ====== Constructor/Destructor =========================================
   public:
   SpectrumAnalyzer();

   ~SpectrumAnalyzer();


   // ====== AudioQualityInterface implementation ===========================
   card16 getSamplingRate() const;

   card8 getBits() const;

   card8 getChannels() const;


   card16 getByteOrder() const;


   cardinal getBytesPerSecond() const;

   cardinal getBitsPerSample() const;


   card16 setSamplingRate(const card16 samplingRate);

   card8 setBits(const card8 bits);

   card8 setChannels(const card8 channels);


   card16 setByteOrder(const card16 byteOrder);


   // ====== AudioInterface implementation ==================================
   bool ready() const;

   void sync();

   bool write(const void* data, const size_t length);


   // ====== Spectrum analyzer functions ====================================
   bool getSpectrum(cardinal* left, cardinal* right, const cardinal bars);


   // ====== Internal data ==================================================
   private:
   void doFourierTransformation(card16* data, cardinal* output, cardinal bars);


   static const cardinal      FFTPoints = 256;
   FastFourierTransformation* FFT;
   cardinal                   InputBufferPos;
   char                       InputBuffer[4 * FFTPoints];


   card16                     AudioSamplingRate;
   card8                      AudioBits;
   card8                      AudioChannels;
   card16                     AudioByteOrder;
};


#endif