mipaudiofilter.h

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/*
    
  This file is a part of EMIPLIB, the EDM Media over IP Library.
  
  Copyright (C) 2006-2011  Hasselt University - Expertise Centre for
                      Digital Media (EDM) (http://www.edm.uhasselt.be)

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library 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
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  
  USA

*/

#ifndef MIPAUDIOFILTER_H

#define MIPAUDIOFILTER_H

#include "mipconfig.h"
#include "mipcomponent.h"
#include "miprawaudiomessage.h"
#include "miptime.h"
#include <list>

class MIPAudioMessage;

class EMIPLIB_IMPORTEXPORT MIPAudioFilter : public MIPComponent
{
public:
        MIPAudioFilter();
        ~MIPAudioFilter();

        bool init(int sampRate, int channels, MIPTime interval);

        void setLowFilter(float frequency)                                              { m_lowFreq = frequency; m_useLow = true; }

        void setHighFilter(float frequency)                                             { m_highFreq = frequency; m_useHigh = true; }

        void setMiddleFilter(float lowFrequency, float highFrequency)                   { m_midLowFreq = lowFrequency; m_midHighFreq = highFrequency; m_useMiddle = true; }

        void clearLowFilter()                                                           { m_useLow = false; }

        void clearHighFilter()                                                          { m_useHigh = false; }

        void clearMiddleFilter()                                                        { m_useMiddle = false; }

        bool push(const MIPComponentChain &chain, int64_t iteration, MIPMessage *pMsg);
        bool pull(const MIPComponentChain &chain, int64_t iteration, MIPMessage **pMsg);
private:
        void cleanUp();
        void clearMessages();

        bool m_useLow, m_useHigh, m_useMiddle;
        float m_lowFreq, m_highFreq, m_midLowFreq, m_midHighFreq;
        
        bool m_init;
        int m_sampRate, m_channels;
        int m_audioSize, m_numFrames;
        float *m_pAM, *m_pBM;
        float *m_pA, *m_pB;
        float *m_pBuf;
        float m_period;
        std::list<MIPAudioMessage *> m_messages;
        std::list<MIPAudioMessage *>::const_iterator m_msgIt;
        int64_t m_prevIteration;
};

#endif // MIPAUDIOFILTER_H