hwmemobj.h

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: hwmemobj.h,v 1.1.1.1.42.1 2004/07/09 01:58:56 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
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 * the file under the current version of the RealNetworks Community
 * Source License (the "RCSL") available at
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 * will apply. You may also obtain the license terms directly from
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 * This file is part of the Helix DNA Technology. RealNetworks is the
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 * ***** END LICENSE BLOCK ***** */

#ifndef _HWMEMOBJ_H_
#define _HWMEMOBJ_H_

// Class to access hardware memory represented by a structre.
// Some video cards return a structure instead of a buffer for
// windows DirectDraw::Lock calls.  This class provides a base
// framework to support any proprietary format.

// Flags for DeviceToRenderer
#define WRITE_VIDEO_TO_STRUCT       (1<<0)

// Flags for QueryOperation
#define PERFORMED_HW_MOTION_COMP    (1<<0)
#define PERFORMED_HW_IDCT           (1<<1)
#define PERFORMED_HW_ALPHA_BLEND    (1<<2)

class CBaseSurface;

class CHWMemObj
{
public:
    CHWMemObj(CBaseSurface* pSurface) : m_pSurface(pSurface),
                                        m_ulOperationFlags(0) {};
    virtual ~CHWMemObj() {};

    // Convert a proprietary surface pointer to something a
    // render plugin can use.
    virtual void*   DeviceToRenderer(UCHAR* pHwMem,
                                     INT32& nPitch,
                                     UINT32 ulFlags=0)
        {return NULL;}

    // Convert the render plugin data back to the device's native format 
    virtual void*   RendererToDevice(UCHAR* pRendPtr) {return NULL;}
    
    // Perform "actions" on the surface.  This must support a bit
    // transfer at a minimum.  Some devices may have hw capabilities
    // that can be used.  Use the generic pParams for any other data
    // the device may need.
    virtual BOOL    ProcessCommand(UCHAR*  pSrcPtr,
                                   INT32   fourCCIn, 
                                   HXxSize *pSrcSize,
                                   HXxRect *prSrcRect,
                                   UCHAR*  pRendPtr,
                                   INT32   fourCCOut,
                                   HXxSize *pDestSize, 
                                   HXxRect *prDestRect, 
                                   void*   pParam1=NULL,
                                   void*   pParam2=NULL,
                                   void*   pParam3=NULL)
        {return FALSE;}

    // Query the actions performed by ProcessCommand.
    virtual UINT32  QueryOperation() {return m_ulOperationFlags;}

protected:
    CBaseSurface*   m_pSurface;
    UINT32          m_ulOperationFlags;
};

#endif //_HWMEMOBJ_H_