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55 lines
1.7 KiB
55 lines
1.7 KiB
//------------------------------------------------------------------------------
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// File: MediaBuf.h
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//
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// Desc: Definition of CBaseMediaBuffer class.
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//
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// Copyright (c) 1999-2000, Microsoft Corporation. All rights reserved.
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//------------------------------------------------------------------------------
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#ifndef __MEDIABUF_H__
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#define __MEDIABUF_H__
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class CBaseMediaBuffer : public IMediaBuffer {
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public:
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CBaseMediaBuffer() {}
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CBaseMediaBuffer(BYTE *pData, ULONG ulSize, ULONG ulData) :
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m_pData(pData), m_ulSize(ulSize), m_ulData(ulData), m_cRef(1) {}
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STDMETHODIMP_(ULONG) AddRef() {
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return InterlockedIncrement((long*)&m_cRef);
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}
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STDMETHODIMP_(ULONG) Release() {
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long l = InterlockedDecrement((long*)&m_cRef);
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if (l == 0)
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delete this;
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return l;
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}
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STDMETHODIMP QueryInterface(REFIID riid, void **ppv) {
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if (riid == IID_IUnknown) {
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AddRef();
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*ppv = (IUnknown*)this;
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return NOERROR;
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}
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else if (riid == IID_IMediaBuffer) {
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AddRef();
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*ppv = (IMediaBuffer*)this;
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return NOERROR;
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}
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else
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return E_NOINTERFACE;
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}
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STDMETHODIMP SetLength(DWORD ulLength) {m_ulData = ulLength; return NOERROR;}
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STDMETHODIMP GetMaxLength(DWORD *pcbMaxLength) {*pcbMaxLength = m_ulSize; return NOERROR;}
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STDMETHODIMP GetBufferAndLength(BYTE **ppBuffer, DWORD *pcbLength) {
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if (ppBuffer) *ppBuffer = m_pData;
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if (pcbLength) *pcbLength = m_ulData;
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return NOERROR;
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}
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protected:
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BYTE *m_pData;
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ULONG m_ulSize;
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ULONG m_ulData;
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ULONG m_cRef;
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};
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#endif __MEDIABUF_H__
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