102 lines
4.1 KiB
C
102 lines
4.1 KiB
C
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//
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// dmstrm.h
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//
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// Copyright (c) 1995-1998 Microsoft Corporation. All rights reserved.
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//
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#ifndef DMSTRM_H
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#define DMSTRM_H
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DEFINE_GUID(IID_IDMStream, 0x1894c260, 0xaa21, 0x11d1, 0x86, 0xbc, 0x0, 0xc0, 0x4f, 0xbf, 0x8f, 0xef);
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DECLARE_INTERFACE_(IDMStream, IUnknown)
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{
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// IUnknown
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STDMETHOD(QueryInterface) (THIS_ REFIID, LPVOID FAR *) PURE;
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STDMETHOD_(ULONG,AddRef) (THIS) PURE;
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STDMETHOD_(ULONG,Release) (THIS) PURE;
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// IDMStream
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STDMETHOD(Init) (THIS_ IStream* pStream) PURE;
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STDMETHOD(Descend) (THIS_ LPMMCKINFO lpck, LPMMCKINFO lpckParent, UINT wFlags) PURE;
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STDMETHOD(Ascend) (THIS_ LPMMCKINFO lpck, UINT wFlags) PURE;
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STDMETHOD(CreateChunk) (THIS_ LPMMCKINFO lpck, UINT wFlags) PURE;
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STDMETHOD(SetStream) (THIS_ IStream* pIStream) PURE;
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STDMETHOD_(IStream*, GetStream) (THIS) PURE;
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};
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STDAPI AllocDirectMusicStream(IStream* pIStream, IDMStream** ppIDMStream);
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class CDirectMusicStream : public IDMStream
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{
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public:
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CDirectMusicStream();
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~CDirectMusicStream();
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STDMETHODIMP Init(IStream* pStream);
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// IUnknown
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STDMETHODIMP QueryInterface(REFIID riid, LPVOID *ppvObj);
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STDMETHODIMP_(ULONG) AddRef();
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STDMETHODIMP_(ULONG) Release();
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// IDMStream
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STDMETHODIMP Descend(LPMMCKINFO lpck, LPMMCKINFO lpckParent, UINT wFlags);
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STDMETHODIMP Ascend(LPMMCKINFO lpck, UINT wFlags);
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STDMETHODIMP CreateChunk(LPMMCKINFO lpck, UINT wFlags);
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STDMETHODIMP SetStream(IStream* pStream);
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STDMETHODIMP_(IStream*) GetStream();
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private:
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long m_cRef; // object reference count
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IStream* m_pStream; // stream to operate on
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};
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// Macro to round up an odd size to RIFF 16 bit boundary.
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#define RIFF_ALIGN(dwSize) (dwSize + (dwSize & 1))
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typedef struct _RIFFIO
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{
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FOURCC ckid; /* chunk ID */
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long cksize; /* chunk size */
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FOURCC fccType; /* form type or list type */
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long lRead; /* How much of this chunk has been read so far. */
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_RIFFIO * pParent; /* pointer to parent chunk */
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LARGE_INTEGER liPosition; /* Filled in by MarkPosition() when handing stream to another component. */
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} RIFFIO;
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class CRiffParser
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{
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public:
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CRiffParser(IStream *pStream);
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void DebugOn() { m_fDebugOn = TRUE; } // Turns on tracing of parsing. Only available in debug builds.
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BOOL NextChunk(HRESULT * pHr); // Does the work of LeaveChunk, MoreChunks, and EnterChunk in one call.
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void EnterList(RIFFIO *pChunk); // Descend into a new list.
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void LeaveList(); // Pop out of the current list.
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BOOL MoreChunks(); // Returns true if there are more chunks to process in this LIST or RIFF.
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HRESULT EnterChunk(); // Reads header of next chunk in this LIST or RIFF container.
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HRESULT LeaveChunk(); // Move to the end of the current chunk in the LIST or RIFF.
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void MarkPosition(); // Stores the absolute position of the start of the current chunk.
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HRESULT SeekBack(); // Scan back to the beginning of the current chunk.
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HRESULT SeekForward(); // Scan forward to the end of the current chunk.
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HRESULT Read(void *pv,ULONG cb); // Reads data from stream.
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HRESULT Skip(ULONG ulBytes); // Seeks forward ulBytes.
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void EnteringComponent() { m_fInComponent = true; }
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BOOL ComponentFailed() { return m_fComponentFailed; }
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IStream * GetStream() { return m_pStream; }
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private:
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BOOL m_fDebugOn; // Set true to turn tracing of parsing on.
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BOOL m_fFirstPass; // Used by NextChunk to understand whether this is the first time in the list.
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IStream * m_pStream; // Stream to operate on.
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RIFFIO * m_pChunk; // Current chunk that we are in.
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RIFFIO * m_pParent; // Parent chunk of current chunk.
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long m_lRead; // How far we've read in the current chunk.
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BOOL m_fComponentFailed; // Set true if a component failed to load, yet the file is okay.
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BOOL m_fInComponent; // Set to true when inside a component's chunk.
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};
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#endif // #ifndef DMSTRM_H
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