/*
 * Copyright 2004-2008, François Revol, <revol@free.fr>.
 * Distributed under the terms of the MIT License.
 */
#ifndef _CAM_BUFFERED_FILTER_INTERFACE_H
#define _CAM_BUFFERED_FILTER_INTERFACE_H

#include <kernel/OS.h>
#include <support/DataIO.h>
#include <interface/Rect.h>
#include "CamFilterInterface.h"

class CamBufferedFilterInterface : public CamFilterInterface {
public:
                        CamBufferedFilterInterface(CamDevice *device, bool allowWrite);
virtual         ~CamBufferedFilterInterface();

        // BPositionIO interface
virtual ssize_t         Read(void *buffer, size_t size);
virtual ssize_t         ReadAt(off_t pos, void *buffer, size_t size);

virtual ssize_t         Write(const void *buffer, size_t size);
virtual ssize_t         WriteAt(off_t pos, const void *buffer, size_t size);

virtual off_t           Seek(off_t position, uint32 seek_mode);
virtual off_t           Position() const;
virtual status_t        SetSize(off_t size);
        // size of the buffer required for reading a whole frame
virtual size_t          FrameSize();

        // frame handling
virtual status_t        DropFrame();
        // video settings propagation
virtual status_t        SetVideoFrame(BRect frame);


protected:
bool                    fAllowWrite;
BMallocIO               fInternalBuffer;
};


#endif /* _CAM_BUFFERED_FILTER_INTERFACE_H */