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
*/
#include "strmbase_private.h"
WINE_DEFAULT_DEBUG_CHANNEL(strmbase);
typedef struct IEnumPinsImpl
{
IEnumPins IEnumPins_iface;
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LONG refCount;
unsigned int uIndex, count;
struct strmbase_filter *base;
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 enum_pins_create(struct strmbase_filter *base, IEnumPins **out)
{
IEnumPinsImpl *object;
IPin *pin;
if (!out)
return E_POINTER;
if (!(object = heap_alloc_zero(sizeof(*object))))
{
*out = NULL;
return E_OUTOFMEMORY;
}
object->IEnumPins_iface.lpVtbl = &IEnumPinsImpl_Vtbl;
object->refCount = 1;
object->base = base;
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IBaseFilter_AddRef(&base->IBaseFilter_iface);
object->Version = base->pin_version;
while ((pin = base->ops->filter_get_pin(base, object->count)))
++object->count;
TRACE("Created enumerator %p.\n", object);
*out = &object->IEnumPins_iface;
return S_OK;
}
static HRESULT WINAPI IEnumPinsImpl_QueryInterface(IEnumPins * iface, REFIID riid, LPVOID * ppv)
{
TRACE("(%p)->(%s, %p)\n", iface, 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 ref = InterlockedIncrement(&This->refCount);
TRACE("(%p)->(): new ref = %u\n", iface, ref);
return ref;
}
static ULONG WINAPI IEnumPinsImpl_Release(IEnumPins * iface)
{
IEnumPinsImpl *This = impl_from_IEnumPins(iface);
ULONG ref = InterlockedDecrement(&This->refCount);
TRACE("(%p)->(): new ref = %u\n", iface, ref);
if (!ref)
{
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IBaseFilter_Release(&This->base->IBaseFilter_iface);
heap_free(This);
}
return ref;
}
static HRESULT WINAPI IEnumPinsImpl_Next(IEnumPins * iface, ULONG cPins, IPin ** ppPins, ULONG * pcFetched)
{
IEnumPinsImpl *This = impl_from_IEnumPins(iface);
ULONG i;
TRACE("(%p)->(%u, %p, %p)\n", iface, cPins, ppPins, pcFetched);
if (!ppPins)
return E_POINTER;
if (cPins > 1 && !pcFetched)
return E_INVALIDARG;
if (pcFetched)
*pcFetched = 0;
if (This->Version != This->base->pin_version)
return VFW_E_ENUM_OUT_OF_SYNC;
for (i = 0; i < cPins; ++i)
{
IPin *pin = This->base->ops->filter_get_pin(This->base, This->uIndex + i);
if (!pin)
break;
IPin_AddRef(ppPins[i] = pin);
}
if (pcFetched)
*pcFetched = i;
This->uIndex += i;
if (i < cPins)
return S_FALSE;
return S_OK;
}
static HRESULT WINAPI IEnumPinsImpl_Skip(IEnumPins *iface, ULONG count)
{
IEnumPinsImpl *enum_pins = impl_from_IEnumPins(iface);
TRACE("enum_pins %p, count %u.\n", enum_pins, count);
if (enum_pins->Version != enum_pins->base->pin_version)
return VFW_E_ENUM_OUT_OF_SYNC;
if (enum_pins->uIndex + count > enum_pins->count)
return S_FALSE;
enum_pins->uIndex += count;
return S_OK;
}
static HRESULT WINAPI IEnumPinsImpl_Reset(IEnumPins *iface)
{
IEnumPinsImpl *enum_pins = impl_from_IEnumPins(iface);
IPin *pin;
TRACE("iface %p.\n", iface);
if (enum_pins->Version != enum_pins->base->pin_version)
{
enum_pins->count = 0;
while ((pin = enum_pins->base->ops->filter_get_pin(enum_pins->base, enum_pins->count)))
++enum_pins->count;
}
enum_pins->Version = enum_pins->base->pin_version;
enum_pins->uIndex = 0;
return S_OK;
}
static HRESULT WINAPI IEnumPinsImpl_Clone(IEnumPins *iface, IEnumPins **out)
{
IEnumPinsImpl *enum_pins = impl_from_IEnumPins(iface);
HRESULT hr;
TRACE("iface %p, out %p.\n", iface, out);
if (FAILED(hr = enum_pins_create(enum_pins->base, out)))
return hr;
return IEnumPins_Skip(*out, enum_pins->uIndex);
}
static const IEnumPinsVtbl IEnumPinsImpl_Vtbl =
{
IEnumPinsImpl_QueryInterface,
IEnumPinsImpl_AddRef,
IEnumPinsImpl_Release,
IEnumPinsImpl_Next,
IEnumPinsImpl_Skip,
IEnumPinsImpl_Reset,
IEnumPinsImpl_Clone
};