Sweden-Number/dlls/strmbase/enumpins.c

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/*
* Implementation of IEnumPins Interface
*
* Copyright 2003 Robert Shearman
* Copyright 2010 Aric Stewart, CodeWeavers
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#define COBJMACROS
#include "dshow.h"
#include "wine/strmbase.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(strmbase);
typedef struct IEnumPinsImpl
{
IEnumPins IEnumPins_iface;
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LONG refCount;
ULONG uIndex;
BaseFilter *base;
BaseFilter_GetPin receive_pin;
BaseFilter_GetPinCount receive_pincount;
BaseFilter_GetPinVersion receive_version;
DWORD Version;
} IEnumPinsImpl;
static inline IEnumPinsImpl *impl_from_IEnumPins(IEnumPins *iface)
{
return CONTAINING_RECORD(iface, IEnumPinsImpl, IEnumPins_iface);
}
static const struct IEnumPinsVtbl IEnumPinsImpl_Vtbl;
HRESULT WINAPI EnumPins_Construct(BaseFilter *base, BaseFilter_GetPin receive_pin, BaseFilter_GetPinCount receive_pincount, BaseFilter_GetPinVersion receive_version, IEnumPins ** ppEnum)
{
IEnumPinsImpl * pEnumPins;
if (!ppEnum)
return E_POINTER;
pEnumPins = CoTaskMemAlloc(sizeof(IEnumPinsImpl));
if (!pEnumPins)
{
*ppEnum = NULL;
return E_OUTOFMEMORY;
}
pEnumPins->IEnumPins_iface.lpVtbl = &IEnumPinsImpl_Vtbl;
pEnumPins->refCount = 1;
pEnumPins->uIndex = 0;
pEnumPins->receive_pin = receive_pin;
pEnumPins->receive_pincount = receive_pincount;
pEnumPins->receive_version = receive_version;
pEnumPins->base = base;
IBaseFilter_AddRef((IBaseFilter*)base);
*ppEnum = &pEnumPins->IEnumPins_iface;
pEnumPins->Version = receive_version(base);
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TRACE("Created new enumerator (%p)\n", *ppEnum);
return S_OK;
}
static HRESULT WINAPI IEnumPinsImpl_QueryInterface(IEnumPins * iface, REFIID riid, LPVOID * ppv)
{
TRACE("(%s, %p)\n", debugstr_guid(riid), ppv);
*ppv = NULL;
if (IsEqualIID(riid, &IID_IUnknown))
*ppv = iface;
else if (IsEqualIID(riid, &IID_IEnumPins))
*ppv = iface;
if (*ppv)
{
IUnknown_AddRef((IUnknown *)(*ppv));
return S_OK;
}
FIXME("No interface for %s!\n", debugstr_guid(riid));
return E_NOINTERFACE;
}
static ULONG WINAPI IEnumPinsImpl_AddRef(IEnumPins * iface)
{
IEnumPinsImpl *This = impl_from_IEnumPins(iface);
ULONG refCount = InterlockedIncrement(&This->refCount);
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TRACE("(%p)->() AddRef from %d\n", This, refCount - 1);
return refCount;
}
static ULONG WINAPI IEnumPinsImpl_Release(IEnumPins * iface)
{
IEnumPinsImpl *This = impl_from_IEnumPins(iface);
ULONG refCount = InterlockedDecrement(&This->refCount);
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TRACE("(%p)->() Release from %d\n", This, refCount + 1);
if (!refCount)
{
IBaseFilter_Release((IBaseFilter*)This->base);
CoTaskMemFree(This);
return 0;
}
else
return refCount;
}
static HRESULT WINAPI IEnumPinsImpl_Next(IEnumPins * iface, ULONG cPins, IPin ** ppPins, ULONG * pcFetched)
{
IEnumPinsImpl *This = impl_from_IEnumPins(iface);
HRESULT hr = S_OK;
ULONG i = 0;
TRACE("(%u, %p, %p)\n", cPins, ppPins, pcFetched);
if (!ppPins)
return E_POINTER;
if (cPins > 1 && !pcFetched)
return E_INVALIDARG;
if (pcFetched)
*pcFetched = 0;
if (This->Version != This->receive_version(This->base))
return VFW_E_ENUM_OUT_OF_SYNC;
while (i < cPins && hr == S_OK)
{
IPin *pin;
pin = This->receive_pin(This->base, This->uIndex + i);
if (!pin)
break;
else
ppPins[i] = pin;
++i;
}
if (pcFetched)
*pcFetched = i;
This->uIndex += i;
if (i < cPins)
return S_FALSE;
return S_OK;
}
static HRESULT WINAPI IEnumPinsImpl_Skip(IEnumPins * iface, ULONG cPins)
{
IEnumPinsImpl *This = impl_from_IEnumPins(iface);
TRACE("(%u)\n", cPins);
if (This->Version != This->receive_version(This->base))
return VFW_E_ENUM_OUT_OF_SYNC;
if (This->receive_pincount(This->base) >= This->uIndex + cPins)
return S_FALSE;
This->uIndex += cPins;
return S_OK;
}
static HRESULT WINAPI IEnumPinsImpl_Reset(IEnumPins * iface)
{
IEnumPinsImpl *This = impl_from_IEnumPins(iface);
TRACE("IEnumPinsImpl::Reset()\n");
This->Version = This->receive_version(This->base);
This->uIndex = 0;
return S_OK;
}
static HRESULT WINAPI IEnumPinsImpl_Clone(IEnumPins * iface, IEnumPins ** ppEnum)
{
HRESULT hr;
IEnumPinsImpl *This = impl_from_IEnumPins(iface);
TRACE("(%p)\n", ppEnum);
hr = EnumPins_Construct(This->base, This->receive_pin, This->receive_pincount, This->receive_version, ppEnum);
if (FAILED(hr))
return hr;
return IEnumPins_Skip(*ppEnum, This->uIndex);
}
static const IEnumPinsVtbl IEnumPinsImpl_Vtbl =
{
IEnumPinsImpl_QueryInterface,
IEnumPinsImpl_AddRef,
IEnumPinsImpl_Release,
IEnumPinsImpl_Next,
IEnumPinsImpl_Skip,
IEnumPinsImpl_Reset,
IEnumPinsImpl_Clone
};