/*

     File: ACSimpleCodec.h 

 Abstract:  Part of CoreAudio Utility Classes  

  Version: 1.0 

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*/

#if !defined(__ACSimpleCodec_h__)

#define __ACSimpleCodec_h__

//=============================================================================

//  Includes

//=============================================================================

#include "ACBaseCodec.h"

//=============================================================================

//  ACSimpleCodec

//

//  This extension of ACBaseCodec provides for a simple ring buffer to handle

//  input data.

//=============================================================================

class ACSimpleCodec

:

    public ACBaseCodec

{

//  Construction/Destruction

public:

                        ACSimpleCodec(UInt32 inInputBufferByteSize, AudioComponentInstance inInstance);

    virtual             ~ACSimpleCodec();

//  Data Handling

public:

    virtual void        Initialize(const AudioStreamBasicDescription* inInputFormat, const AudioStreamBasicDescription* inOutputFormat, const void* inMagicCookie, UInt32 inMagicCookieByteSize) = 0;

    virtual void        Uninitialize();

    virtual void        Reset();

    virtual void        AppendInputData(const void* inInputData, UInt32& ioInputDataByteSize, UInt32& ioNumberPackets, const AudioStreamPacketDescription* inPacketDescription);

    virtual void        ZeroPadInputData(UInt32& ioNumberPackets, const AudioStreamPacketDescription* inPacketDescription);

    virtual UInt32      GetInputBufferByteSize() const;

    virtual UInt32      GetUsedInputBufferByteSize() const;

    virtual void        GetPropertyInfo(AudioCodecPropertyID inPropertyID, UInt32& outPropertyDataSize, Boolean& outWritable);

    virtual void        SetProperty(AudioCodecPropertyID inPropertyID, UInt32 inPropertyDataSize, const void* inPropertyData);

protected:

    void                ConsumeInputData(UInt32 inConsumedByteSize);    

    Byte*               GetInputBufferStart() const { return mInputBuffer + mInputBufferStart; }

    UInt32              GetInputBufferContiguousByteSize() const { return (mInputBufferStart <= mInputBufferEnd) ? (mInputBufferEnd - mInputBufferStart) : (mInputBufferByteSize - mInputBufferStart); }

    virtual void        ReallocateInputBuffer(UInt32 inInputBufferByteSize);

    // returns a pointer to contiguous bytes. 

    // will do some copying if the request wraps around the internal buffer.

    // request must be less than available bytes

    Byte*               GetBytes(UInt32& ioNumberBytes) const;

private:    

    Byte*               mInputBuffer;

    UInt32              mInputBufferByteSize;

    UInt32              mInputBufferStart;

    UInt32              mInputBufferEnd;

};

#endif