MpDTMFDetector.h

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//  
// Copyright (C) 2007 SIPfoundry Inc. 
// Licensed by SIPfoundry under the LGPL license. 
//  
// Copyright (C) 2007 SIPez LLC. 
// Licensed to SIPfoundry under a Contributor Agreement. 
//  
// $$ 

// Author: Keith Kyzivat <kkyzivat AT SIPez DOT com>

#ifndef _MpDTMFDetector_h_
#define _MpDTMFDetector_h_

// SYSTEM INCLUDES
// APPLICATION INCLUDES
#include <os/OsIntTypes.h>
#include <mp/MpTypes.h>
#include <utl/UtlDefs.h>  // UtlBoolean

// DEFINES
// EXTERNAL FUNCTIONS
// EXTERNAL VARIABLES
// CONSTANTS
// STRUCTS
// TYPEDEFS
// MACROS
// FORWARD DECLARATIONS

class MpDtmfDetector
{
/* //////////////////////////// PUBLIC //////////////////////////////////// */
public:
/* ============================ CREATORS ================================== */


   MpDtmfDetector(const unsigned samplesPerSec, const unsigned nProcessSamples);

   virtual ~MpDtmfDetector();


/* ============================ MANIPULATORS ============================== */


   void reset();
   void setSamplesPerSec(const unsigned samplesPerSec);
   void setNumProcessSamples(const unsigned nProcessSamples);
   UtlBoolean processSample(const MpAudioSample sample);

/* ============================ ACCESSORS ================================= */


   unsigned getSamplesPerSec() const;

   unsigned getNumProcessSamples() const;

   char getLastDetectedDTMF() const;

/* ============================ INQUIRY =================================== */



/* //////////////////////////// PROTECTED ///////////////////////////////// */
protected:

/* //////////////////////////// PRIVATE /////////////////////////////////// */
private:
   void calcCoeffs();
   void dtmfValidation();
private:
   unsigned mSamplesPerSec;
   unsigned mNumProcessSamples;
   uint32_t mSampleCount;

   static double sFreqs_to_detect[]; 
   static uint8_t snFreqsToDetect;

   double* mQ1;
   double* mQ2;
   double* mR;

   double* mCoefs;

   char mLastDetectedDTMF;
};

/* ============================ INLINE METHODS ============================ */

#endif  // _MpDTMFDetector_h_