segytr.h

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#pragma once

/*+
________________________________________________________________________

 (C) dGB Beheer B.V.; (LICENSE) http://opendtect.org/OpendTect_license.txt
 Author:        A.H. Bril
 Date:          2-4-1996
________________________________________________________________________

Translators for SEGY files traces.

-*/

#include "segyfiledef.h"
#include "seistrctr.h"
#include "tracedata.h"
#include "strmdata.h"
#include "uistring.h"

class LinScaler;
class BendPoints2Coords;
namespace SEGY { class TxtHeader; class BinHeader; class TrcHeader; }

#define mSEGYTraceHeaderBytes   240


mExpClass(Seis) SEGYSeisTrcTranslator : public SeisTrcTranslator
{ mODTextTranslationClass(SEGYSeisTrcTranslator); isTranslator(SEGY,SeisTrc)
public:

                        SEGYSeisTrcTranslator(const char*,const char*);
                        ~SEGYSeisTrcTranslator();
    virtual const char* defExtension() const    { return "sgy"; }

    virtual bool        readInfo(SeisTrcInfo&);
    virtual bool        read(SeisTrc&);
    virtual bool        skip(int);
    bool                goToTrace(int);
    int                 traceSizeOnDisk() const;
    bool                getFullTrcAsBuf(unsigned char*);

    bool                isRev0() const;
    int                 numberFormat() const    { return filepars_.fmt_; }
    int                 estimatedNrTraces() const { return estnrtrcs_; }

    void                toSupported(DataCharacteristics&) const;
    void                usePar(const IOPar&);

    const SEGY::TxtHeader* txtHeader() const    { return txthead_; }
    const SEGY::BinHeader& binHeader() const    { return binhead_; }
    const SEGY::TrcHeader& trcHeader() const    { return trchead_; }
    void                setTxtHeader(SEGY::TxtHeader*); 
    void                setForcedRev( int rev ) { forcedrev_ = rev; }
    void                setForceRev0( bool yn ) { forcedrev_ = yn ? 0 : 1; }

    int                 dataBytes() const;
    int                 forcedRev() const       { return forcedrev_; }
    bool                rev0Forced() const      { return forcedrev_ == 0; }
    SEGY::FilePars&     filePars()              { return filepars_; }
    SEGY::FileReadOpts& fileReadOpts()          { return fileopts_; }
    const unsigned char* blockBuf() const       { return blockbuf_; }

    virtual bool        implManagesObjects( const IOObj* ) const
                                                { return true; }
    void                cleanUp();

protected:

    SEGY::FilePars      filepars_;
    SEGY::FileReadOpts  fileopts_;
    SEGY::TxtHeader*    txthead_;
    SEGY::BinHeader&    binhead_;
    SEGY::TrcHeader&    trchead_; // must be *after* fileopts_
    LinScaler*          trcscale_;
    const LinScaler*    curtrcscale_;
    int                 forcedrev_;

    bool                useinpsd_;
    TraceDataInterpreter* storinterp_;
    unsigned char       headerbuf_[mSEGYTraceHeaderBytes];
    bool                headerdone_;

    // Following variables are inited by commitSelections
    unsigned char*      blockbuf_;
    ComponentData*      inpcd_;
    TargetComponentData* outcd_;

    inline StreamConn&  sConn()         { return *(StreamConn*)conn_; }

    bool                commitSelections_();
    virtual bool        initRead_();
    virtual bool        initWrite_(const SeisTrc&);
    virtual bool        writeTrc_(const SeisTrc&);

    bool                readTraceHeadBuffer();
    bool                readDataToBuf();
    bool                readData(SeisTrc&);
    bool                writeData(const SeisTrc&);
    virtual bool        readTapeHeader();
    virtual void        updateCDFromBuf();
    virtual void        interpretBuf(SeisTrcInfo&);
    virtual bool        writeTapeHeader();
    virtual void        fillHeaderBuf(const SeisTrc&);
    void                selectWriteDataChar(DataCharacteristics&) const;
    void                fillErrMsg(const uiString&, bool);
    bool                noErrMsg();

    DataCharacteristics getDataChar(int) const;
    int                 nrFormatFor(const DataCharacteristics&) const;
    void                addWarn(int,const char*);
    const char*         getTrcPosStr() const;
    bool                tryInterpretBuf(SeisTrcInfo&);
    bool                skipThisTrace(SeisTrcInfo&,int&);

    int                 curtrcnr_, prevtrcnr_;
    BinID               curbid_, prevbid_;
    float               curoffs_, prevoffs_;
    SEGY::OffsetCalculator offsetcalc_;
    Coord               curcoord_;
    BendPoints2Coords*  bp2c_;
    int                 estnrtrcs_;
    bool                othdomain_;

};