comimgff.h

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/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
 *  
 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 
 *      
 * The contents of this file, and the files included with this file, are 
 * subject to the current version of the RealNetworks Public Source License 
 * Version 1.0 (the "RPSL") available at 
 * http://www.helixcommunity.org/content/rpsl unless you have licensed 
 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
 * directly from RealNetworks.  You may not use this file except in 
 * compliance with the RPSL or, if you have a valid RCSL with RealNetworks 
 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
 * RCSL for the rights, obligations and limitations governing use of the 
 * contents of the file.  
 *  
 * This file is part of the Helix DNA Technology. RealNetworks is the 
 * developer of the Original Code and owns the copyrights in the portions 
 * it created. 
 *  
 * This file, and the files included with this file, is distributed and made 
 * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS 
 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * 
 * Technology Compatibility Kit Test Suite(s) Location: 
 *    http://www.helixcommunity.org/content/tck 
 * 
 * Contributor(s): 
 *  
 * ***** END LICENSE BLOCK ***** */ 

#ifndef COMIMGFF_H
#define COMIMGFF_H

// Forward declarations
typedef _INTERFACE IHXRequest            IHXRequest;
typedef _INTERFACE IHXFormatResponse     IHXFormatResponse;
typedef _INTERFACE IHXFileObject         IHXFileObject;
typedef _INTERFACE IHXBuffer             IHXBuffer;
typedef _INTERFACE IHXPacket             IHXPacket;
typedef _INTERFACE IHXCommonClassFactory IHXCommonClassFactory;


class CCommonImageFileFormat : public CHXBaseCountingObject,
                               public IHXPlugin,
                               public IHXFileFormatObject,
                               public IHXFileResponse,
                               public IHXFileMimeMapperResponse
{
public:
    CCommonImageFileFormat();
    virtual ~CCommonImageFileFormat();

    // IUnknown methods
    STDMETHOD(QueryInterface)  (THIS_ REFIID riid, void** ppvObj);
    STDMETHOD_(UINT32,AddRef)  (THIS);
    STDMETHOD_(UINT32,Release) (THIS);

    // IHXPlugin methods
    STDMETHOD(GetPluginInfo) (THIS_ REF(BOOL)        rbLoadMultiple,
                                    REF(const char*) rpszDescription,
                                    REF(const char*) rpszCopyright,
                                    REF(const char*) rpszMoreInfoURL,
                                    REF(UINT32)      rulVersionNumber);
    STDMETHOD(InitPlugin)    (THIS_ IUnknown* pContext);

    // IHXFileFormatObject methods
    STDMETHOD(GetFileFormatInfo) (THIS_ REF(const char**) rppszFileMimeTypes,
                                        REF(const char**) rppszFileExtensions,
                                        REF(const char**) rppszFileOpenNames);
    STDMETHOD(InitFileFormat)    (THIS_ IHXRequest*        pRequest,
                                        IHXFormatResponse* pFormatResponse,
                                        IHXFileObject*     pFileObject);
    STDMETHOD(GetFileHeader)     (THIS);
    STDMETHOD(GetStreamHeader)   (THIS_ UINT16 usStreamNum);
    STDMETHOD(GetPacket)         (THIS_ UINT16 usStreamNum);
    STDMETHOD(Seek)              (THIS_ UINT32 ulRequestedTime);
    STDMETHOD(Close)             (THIS);

    // IHXFileResponse methods
    STDMETHOD(InitDone)  (THIS_ HX_RESULT status);
    STDMETHOD(SeekDone)  (THIS_ HX_RESULT status);
    STDMETHOD(ReadDone)  (THIS_ HX_RESULT status, IHXBuffer* pBuffer);
    STDMETHOD(WriteDone) (THIS_ HX_RESULT status);
    STDMETHOD(CloseDone) (THIS_ HX_RESULT status);

    // IHXFileMimeMapperResponse methods
    STDMETHOD(MimeTypeFound) (THIS_ HX_RESULT status, const char* pMimeType);

    // CCommonImageFileFormat methods
    static HX_RESULT STDAPICALLTYPE HXCreateInstance(IUnknown** ppIUnknown);
protected:
    enum
    {
        kStateReady,
        kStateIFFInitDonePending,
        kStateIFFCloseDonePending,
        kStateIFFMimeTypeFoundPending,
        kStateGSHSeekDonePending,
        kStateGSHReadDonePending,
        kStateGSHCloseDonePending,
        kStateGPSeekDonePending,
        kStateGPReadDonePending,
        kStateGPCloseDonePending,
        kStateSeekInitDonePending,
        kInitialHeaderReadSize = 512,
        kBitrate = 12000,
        kPreroll = 1000,
        kDuration = 5000,
        kPacketSize = 1450
    };

    INT32                    m_lRefCount;
    IUnknown*                m_pContext;
    IHXFileObject*           m_pFileObject;
    IHXFormatResponse*       m_pFormatResponse;
    IHXCommonClassFactory*   m_pCommonClassFactory;
    IHXFileMimeMapper*       m_pFileMimeMapper;
    IHXBuffer*               m_pURLStr;
    IHXBuffer*               m_pMimeTypeStr;
    UINT32                   m_ulState;
    UINT32                   m_ulFileOffset;
    UINT32                   m_ulDesiredFileOffset;
    UINT32                   m_ulRequestedFileOffset;
    UINT32                   m_ulHeaderReadSize;
    BOOL                     m_bFileObjectOpen;

    static const char* const m_pszDescription;
    static const char* const m_pszCopyright;
    static const char* const m_pszMoreInfoURL;
    static const char* const m_ppszFileMimeTypes[];
    static const char* const m_ppszFileExtensions[];
    static const char* const m_ppszFileOpenNames[];
    static const char* const m_ppszStreamMimeType[];

    HX_RESULT ParseWidthHeight(IHXBuffer* pBuffer, BOOL bIsWBMP, REF(UINT32) rulWidth,
                               REF(UINT32) rulHeight, REF(UINT32) rulImageType);
    BOOL      IsWBMP(IHXBuffer* pMimeTypeStr, IHXBuffer* pURLStr);

    //Start at pBuf and find the next JPEG marker header. Changes pBuf
    //to point to the start of the marker header found and sets
    //ucMarkerType to the marker found. pBuf must not point to a
    //marker on the first call unless you want to skip it.
    BOOL _GetNextJPGMarker( BYTE** pBuf, BYTE* pBufEnd, BYTE* ucMarkerType );

    //Parses the JPEG SOF segments to get the image size.
    BOOL _ParseJPGSOFSegment( BYTE* pBuf,
                              BYTE* pBufEnd,
                              UINT32& ulWidth,
                              UINT32& ulHeight );

    //Looks up segment size
    BOOL _HasSize( BYTE marker );
    BOOL _IsJPEG( BYTE* pBuf, BYTE* pBufEnd );
};

#endif /* #ifdef COMIMGFF_H */