MpAudioAbstract.h

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//  
// Copyright (C) 2006-2010 SIPez LLC.  All rights reserved.
// Licensed to SIPfoundry under a Contributor Agreement. 
//
// Copyright (C) 2004-2006 SIPfoundry Inc.
// Licensed by SIPfoundry under the LGPL license.
//
// Copyright (C) 2004-2006 Pingtel Corp.  All rights reserved.
// Licensed to SIPfoundry under a Contributor Agreement.
//
// $$

#ifndef MP_AUDIO_ABSTRACT_H
#define MP_AUDIO_ABSTRACT_H

#include <mp/MpTypes.h>
#include <os/iostream>
#include <stdio.h>

typedef short AudioSample; 
typedef unsigned char AudioByte; 


//formats we support
#define AUDIO_FORMAT_UNKNOWN 0
#define AUDIO_FORMAT_WAV     1
#define AUDIO_FORMAT_AU      2

class MpAudioAbstract {

public:

/* ============================ CREATORS ================================== */


    MpAudioAbstract(void);

    MpAudioAbstract(MpAudioAbstract *audio);

    virtual ~MpAudioAbstract();


public:


    virtual size_t getSamples(AudioSample *, size_t) = 0;

    virtual size_t readBytes(AudioByte * buff, size_t length);

    virtual size_t getBytesSize();

    virtual int getDecompressionType(); 


public:


   MpAudioAbstract *getPreviousAudio(void); 

   void setPreviousAudio(MpAudioAbstract *a); 

   MpAudioAbstract *getNextAudio(void); 

   void setNextAudio(MpAudioAbstract *a);


public:


    virtual void setSamplingRate(long s);

    virtual void setSamplingRateRecursive(long s);

    virtual void minMaxSamplingRate(long *min, long *max, long *prefer);

    virtual void negotiateSamplingRate(void);

    virtual long getSamplingRate(void);


public:


    virtual void setChannels(int ch);

    virtual void setChannelsRecursive(int s);

    virtual void minMaxChannels(int *min, int *max, int *preferred) ;

    virtual void negotiateChannels(void);

    virtual int getChannels(void);

    virtual void setAudioFormat(int type) { mDetectedFormat = type;}

    virtual int  getAudioFormat() { return mDetectedFormat;}

    bool isOk() {return mbIsOk;}


/* ============================ PRIVATE ================================== */
private:
    // pointers to MpAudioAbstract itself then 
   MpAudioAbstract *mPrevious; 
   MpAudioAbstract *mNext;     

private: // sampling Rate related stuff    
   long mSamplingRate;
   bool mSamplingRateFrozen;

private: // channel related stuff
   long mChannels;
   bool mChannelsFrozen;

   int mDetectedFormat;

protected:
   bool mbIsOk; 
};

#endif