mipspeexechocanceller.h

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/*
    
  This file is a part of EMIPLIB, the EDM Media over IP Library.
  
  Copyright (C) 2006-2007  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 MIPSPEEXECHOCANCELLER_H

#define MIPSPEEXECHOCANCELLER_H

#include "mipconfig.h"

#ifdef MIPCONFIG_SUPPORT_SPEEX

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

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

        bool init(int sampRate, MIPTime interval = MIPTime(0.020), MIPTime bufferLength = MIPTime(0.100));

        bool destroy();
        
        MIPComponent *getOutputAnalyzer()                                                               { return m_pOutputAnalyzer; }

        bool push(const MIPComponentChain &chain, int64_t iteration, MIPMessage *pMsg);
        bool pull(const MIPComponentChain &chain, int64_t iteration, MIPMessage **pMsg);
private:
        void clearMessages();
        
        class OutputAnalyzer : public MIPComponent
        {
        public:
                OutputAnalyzer(void *pState, int sampRate, int numFrames) : MIPComponent("MIPSpeexEchoCanceller::OutputAnalyzer")
                {
                        m_pSpeexEchoState = pState;
                        m_sampRate = sampRate;
                        m_numFrames = numFrames;
                }

                bool push(const MIPComponentChain &chain, int64_t iteration, MIPMessage *pMsg);
                bool pull(const MIPComponentChain &chain, int64_t iteration, MIPMessage **pMsg);
        private:
                void *m_pSpeexEchoState;
                int m_sampRate;
                int m_numFrames;
        };

        OutputAnalyzer *m_pOutputAnalyzer;
        void *m_pSpeexEchoState;
        int m_sampRate;
        int m_numFrames;

        std::list<MIPRaw16bitAudioMessage *> m_messages;
        std::list<MIPRaw16bitAudioMessage *>::const_iterator m_msgIt;
        int64_t m_prevIteration;
};

#endif // MIPCONFIG_SUPPORT_SPEEX

#endif // MIPSPEEXECHOCANCELLER_H