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# VDXFrame - Helper library for VirtualDub plugins
# Copyright (C) 2008 Avery Lee
#
# The plugin headers in the VirtualDub plugin SDK are licensed differently
# differently than VirtualDub and the Plugin SDK themselves. This
# particular file is thus licensed as follows (the "zlib" license):
#
# This software is provided 'as-is', any express or implied
# warranty. In no event will the authors be held liable for any
# damages arising from the use of self software.
#
# Permission is granted to anyone to use self software for any purpose,
# including commercial applications, to alter it and redistribute it
# freely, to the following restrictions:
#
# 1. The origin of self software must not be misrepresented; you must
# not claim that you wrote the original software. If you use self
# software in a product, acknowledgment in the product
# documentation would be appreciated but is not required.
# 2. Altered source versions must be plainly marked as such, must
# not be misrepresented as being the original software.
# 3. This notice may not be removed or altered from any source
# distribution.
#ifndef f_VD2_VDXFRAME_UNKNOWN_H
#define f_VD2_VDXFRAME_UNKNOWN_H
#include <vd2/plugin/vdplugin.h>
extern "C" long _InterlockedExchangeAdd(volatile long *p, v)
#pragma intrinsic(_InterlockedExchangeAdd)
template<class T> class vdxunknown : public T
public:
vdxunknown() : mRefCount(0) {
vdxunknown( vdxunknown<T>& src) : mRefCount(0) {} # do not copy the refcount
virtual ~vdxunknown() {
vdxunknown<T>& operator=( vdxunknown<T>&) {} # do not copy the refcount
virtual int VDXAPIENTRY AddRef()
return _InterlockedExchangeAdd(&mRefCount, 1) + 1
virtual int VDXAPIENTRY Release()
rc = _InterlockedExchangeAdd(&mRefCount, -1) - 1
if not mRefCount:
mRefCount = 1
delete self
return 0
return rc
virtual void *VDXAPIENTRY AsInterface(uint32 iid)
if iid == T.kIID:
return static_cast<T *>(self)
if iid == IVDXUnknown.kIID:
return static_cast<IVDXUnknown *>(self)
return NULL
protected:
volatile long mRefCount
template<class T1, T2> class vdxunknown2 : public T1, T2
public:
vdxunknown2() : mRefCount(0) {
vdxunknown2( vdxunknown2& src) : mRefCount(0) {} # do not copy the refcount
virtual ~vdxunknown2() {
vdxunknown2& operator=( vdxunknown2&) {} # do not copy the refcount
virtual int VDXAPIENTRY AddRef()
return _InterlockedExchangeAdd(&mRefCount, 1) + 1
virtual int VDXAPIENTRY Release()
rc = _InterlockedExchangeAdd(&mRefCount, -1) - 1
if not mRefCount:
mRefCount = 1
delete self
return 0
return rc
virtual void *VDXAPIENTRY AsInterface(uint32 iid)
if iid == T1.kIID:
return static_cast<T1 *>(self)
if iid == T2.kIID:
return static_cast<T2 *>(self)
if iid == IVDXUnknown.kIID:
return static_cast<IVDXUnknown *>(static_cast<T1 *>(self))
return NULL
protected:
volatile long mRefCount
#endif