/usr/include/sipxtapi/mp/MprNullAec.h is in libsipxtapi-dev 3.3.0~test17-1.
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// Copyright (C) 2007 SIPez LLC.
// Licensed to SIPfoundry under a Contributor Agreement.
//
// Copyright (C) 2007 SIPfoundry Inc.
// Licensed by SIPfoundry under the LGPL license.
//
// $$
///////////////////////////////////////////////////////////////////////////////
// Author: Dan Petrie <dpetrie AT SIPez DOT com>
#ifndef _MprNullAec_h_
#define _MprNullAec_h_
// SYSTEM INCLUDES
// APPLICATION INCLUDES
#include "mp/MpAudioResource.h"
// DEFINES
// MACROS
// EXTERNAL FUNCTIONS
// EXTERNAL VARIABLES
// CONSTANTS
// STRUCTS
// TYPEDEFS
// FORWARD DECLARATIONS
class MprAudioFrameBuffer;
/**
* @brief The MprNullAec resource a no-op AEC implementation intended to be
* a base calls for real AEC implementations..
*
* This resource passes buffers from input 0 straight through to output 0.
*
* Typically AEC looks at the output to the speaker and subtracts that signal
* in some form from the input from the mic to remove the echo. So generically
* AEC has two inputs (mic and speaker) and one output (mic - echo). If this was
* done in a single resource this would create a loop in the process order of
* the resources (a resource must get all its inputs to generate its outputs).
*
* To avoid this loop, AEC is broken into two resources. The MprAudioFrameBuffer
* which simply stores references to the last MpBufs that went through it and
* makes it availabe via an accessor. AEC uses the MprAudioFrameBuffer to get
* the speaker output. So the real AEC resource then has only one input (mic) and
* one output (mic - echo). It gets the speaker output indirectly from the
* MprAudioFrameBuffer.
*/
class MprNullAec : public MpAudioResource
{
/* //////////////////////////// PUBLIC //////////////////////////////////// */
public:
/* ============================ CREATORS ================================== */
///@name Creators
//@{
/// Constructor
MprNullAec(const UtlString& rName,
MprAudioFrameBuffer& MprAudioFrameBuffer);
/// Destructor
virtual
~MprNullAec();
//@}
/* ============================ MANIPULATORS ============================== */
///@name Manipulators
//@{
//@}
/* ============================ ACCESSORS ================================= */
///@name Accessors
//@{
//@}
/* ============================ INQUIRY =================================== */
///@name Inquiry
//@{
//@}
/* //////////////////////////// PROTECTED ///////////////////////////////// */
protected:
/* //////////////////////////// PRIVATE /////////////////////////////////// */
private:
MprAudioFrameBuffer* mpOutputBufferResource;
virtual UtlBoolean doProcessFrame(MpBufPtr inBufs[],
MpBufPtr outBufs[],
int inBufsSize,
int outBufsSize,
UtlBoolean isEnabled,
int samplesPerFrame,
int samplesPerSecond);
/// Copy constructor (not implemented for this class)
MprNullAec(const MprNullAec& rMprNullAec);
/// Assignment operator (not implemented for this class)
MprNullAec& operator=(const MprNullAec& rhs);
};
/* ============================ INLINE METHODS ============================ */
#endif // _MprNullAec_h_
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