/*

* Copyright (c) 2005-2006 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  YUV format transcoder.

*

*/

#include "vtyuvconverter.h"

#ifdef _DEBUG

    #include <e32debug.h>

    #define PRINT RDebug::Print

    #define _IFDBG(a) a

#else

    #define PRINT

    #define _IFDBG(a)

#endif

// ======== MEMBER FUNCTIONS ========

// ---------------------------------------------------------------------------

// VtYuvConverter::ConvertFrom420PlanarTo422Interleaved

// ---------------------------------------------------------------------------

//

TInt VtYuvConverter::ConvertFrom420PlanarTo422Interleaved(

    const TDesC8& aSource,

    const TSize& aSize,

    TDes8& aTarget,

    TInt aStride )

    {

    _IFDBG(PRINT( _L( "VtYuvConverter::ConvertFrom420PlanarTo422Interleaved<" ) ));

    if ( aTarget.MaxLength() < ByteSize422Interleaved( aSize ) )

        {

        _IFDBG(PRINT( _L( "VtYuvConverter::ConvertFrom420PlanarTo422Interleaved> TargetMaxLength < ByteSize422" ) ));

        return KErrUnderflow;

        }

    if ( aSource.Size() != ByteSize420Planar( aSize ) )

        {

        _IFDBG(PRINT( _L( "VtYuvConverter::ConvertFrom420PlanarTo422Interleaved> 420SourceSize != ByteSize420" ) ));

        return KErrArgument;

        }

    TInt planeSize( aSize.iWidth * aSize.iHeight );

    const TUint8* sy = aSource.Ptr();

    const TUint8* su = sy + planeSize;

    const TUint8* sv = su + ( planeSize >> 2 );

    TUint8* t = const_cast< TUint8* >( aTarget.Ptr() );

    TUint8* tsave = t;

    for ( TInt y = ( aSize.iHeight >> 1 ) - 1; y >= 0; y-- )

        {

        const TUint8* susave = su;

        const TUint8* svsave = sv;

        for ( TInt x = ( aSize.iWidth >> 1 ) - 1; x >= 0; x-- )

            {

            *t++ = *su++;

            *t++ = *sy++;

            *t++ = *sv++;

            *t++ = *sy++;

            }

        tsave = t = tsave + aStride;

        su = susave;

        sv = svsave;

        for ( TInt x = ( aSize.iWidth >> 1 ) - 1; x >= 0; x-- )

            {

            *t++ = *su++;

            *t++ = *sy++;

            *t++ = *sv++;

            *t++ = *sy++;

            }

        tsave = t = tsave + aStride;

        }

    _IFDBG(PRINT( _L( "VtYuvConverter::ConvertFrom420PlanarTo422Interleaved>" ) ));

    return KErrNone;

    }

// ---------------------------------------------------------------------------

// VtYuvConverter::ByteSize420Planar

// ---------------------------------------------------------------------------

//

TInt VtYuvConverter::ByteSize420Planar( const TSize& aSizeInPixels )

    {

    TInt planeSize( aSizeInPixels.iWidth * aSizeInPixels.iHeight );

    return planeSize + planeSize / 2;

    }

// ---------------------------------------------------------------------------

// VtYuvConverter::ByteSize422Interleaved

// ---------------------------------------------------------------------------

//

TInt VtYuvConverter::ByteSize422Interleaved( const TSize& aSizeInPixels )

    {

    TInt planeSize( aSizeInPixels.iWidth * aSizeInPixels.iHeight );

    return planeSize * 2;

    }