ancillarydata_cea608_line21.h

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/* SPDX-License-Identifier: MIT */
#ifndef AJA_ANCILLARYDATA_CEA608_LINE21_H
#define AJA_ANCILLARYDATA_CEA608_LINE21_H

#include "ancillarydatafactory.h"
#include "ancillarydata.h"
#include "ancillarydata_cea608.h"


// Line 21 ("Analog") Packet IDs
const uint8_t   AJAAncillaryData_Cea608_Line21_DID = AJAAncData_AnalogSID;
const uint8_t   AJAAncillaryData_Cea608_Line21_SID = AJAAncData_AnalogDID;

const uint32_t  AJAAncillaryData_Cea608_Line21_PayloadSize = 720;       // note: assumes we're only using this for SD (720 pixels/line)



class AJAExport AJAAncillaryData_Cea608_Line21 : public AJAAncillaryData_Cea608
{
public:
    AJAAncillaryData_Cea608_Line21 ();  

    AJAAncillaryData_Cea608_Line21 (const AJAAncillaryData_Cea608_Line21 & inClone);

    AJAAncillaryData_Cea608_Line21 (const AJAAncillaryData_Cea608_Line21 * pInClone);

    AJAAncillaryData_Cea608_Line21 (const AJAAncillaryData * pInData);

    virtual                                 ~AJAAncillaryData_Cea608_Line21 (); 

    virtual void                            Clear (void);       

    virtual AJAAncillaryData_Cea608_Line21 &        operator = (const AJAAncillaryData_Cea608_Line21 & inRHS);

    virtual inline AJAAncillaryData_Cea608_Line21 * Clone (void) const  {return new AJAAncillaryData_Cea608_Line21 (this);} 

    virtual AJAStatus               ParsePayloadData (void);

    virtual AJAStatus               GeneratePayloadData (void);

    static AJAAncDataType           RecognizeThisAncillaryData (const AJAAncillaryData * pInAncData);


protected:
    void                Init (void);    // NOT virtual - called by constructors
    virtual AJAStatus   AllocEncodeBuffer (void);

    // Encode methods ported/stolen from ntv2closedcaptioning.cpp

    virtual AJAStatus   InitEncodeBuffer (const uint32_t inLineStartOffset, uint32_t & outDataStartOffset);


    virtual AJAStatus   EncodeLine (const uint8_t inChar1, const uint8_t inChar2, const uint32_t inDataStartOffset);

    virtual uint8_t *   EncodeCharacter (uint8_t * ptr, const uint8_t inChar);


    virtual uint8_t *   EncodeTransition (uint8_t * ptr, const uint8_t inStartLevel, const uint8_t inEndLevel);


    // Decode methods ported/stolen from ntv2closedcaptioning.cpp

    virtual AJAStatus   DecodeLine (uint8_t & outChar1, uint8_t & outChar2, bool & outGotClock) const;


    static const uint8_t *  CheckDecodeClock (const uint8_t * pInLine, bool & outGotClock);


    static AJAStatus    DecodeCharacters (const uint8_t * ptr, uint8_t & outChar1, uint8_t & outChar2);


protected:
    // Note: if you make a change to the local member data, be sure to ALSO make the appropriate
    //       changes in the Init() and operator= methods!
    bool        m_bEncodeBufferInitialized;     
    uint32_t    m_dataStartOffset;              

};  //  AJAAncillaryData_Cea608_Line21

#endif  // AJA_ANCILLARYDATA_CEA608_LINE21_H