enumfilters.c

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/*
 * Implementation of IEnumFilters Interface
 *
 * Copyright 2004 Christian Costa
 *
 * 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 "quartz_private.h"
 
#include "wine/debug.h"
 
WINE_DEFAULT_DEBUG_CHANNEL(quartz);
 
typedef struct IEnumFiltersImpl
{
    IEnumFilters IEnumFilters_iface;
    LONG refCount;
    IGraphVersion * pVersionSource;
    LONG Version;
    IBaseFilter *** pppFilters;
    ULONG * pNumFilters;
    ULONG uIndex;
} IEnumFiltersImpl;
 
static const struct IEnumFiltersVtbl IEnumFiltersImpl_Vtbl;
 
static inline IEnumFiltersImpl *impl_from_IEnumFilters(IEnumFilters *iface)
{
    return CONTAINING_RECORD(iface, IEnumFiltersImpl, IEnumFilters_iface);
}
 
HRESULT IEnumFiltersImpl_Construct(IGraphVersion * pVersionSource, IBaseFilter *** pppFilters, ULONG * pNumFilters, IEnumFilters ** ppEnum)
{
    /* Note: The incoming IBaseFilter interfaces are not AddRef'd here as in Windows,
     * they should have been previously AddRef'd. */
    IEnumFiltersImpl * pEnumFilters = CoTaskMemAlloc(sizeof(IEnumFiltersImpl));
    HRESULT hr;
    LONG currentVersion;
 
    TRACE("(%p, %p, %p)\n", pppFilters, pNumFilters, ppEnum);
 
    *ppEnum = NULL;
 
    if (!pEnumFilters)
    {
        return E_OUTOFMEMORY;
    }
 
    pEnumFilters->IEnumFilters_iface.lpVtbl = &IEnumFiltersImpl_Vtbl;
    pEnumFilters->refCount = 1;
    pEnumFilters->uIndex = 0;
    pEnumFilters->pNumFilters = pNumFilters;
    pEnumFilters->pppFilters = pppFilters;
    IGraphVersion_AddRef(pVersionSource);
    pEnumFilters->pVersionSource = pVersionSource;
 
    /* Store the current version of the graph */
    hr = IGraphVersion_QueryVersion(pVersionSource, &currentVersion);
    pEnumFilters->Version = (hr==S_OK) ? currentVersion : 0;
 
    *ppEnum = &pEnumFilters->IEnumFilters_iface;
    return S_OK;
}
 
static HRESULT WINAPI IEnumFiltersImpl_QueryInterface(IEnumFilters * iface, REFIID riid, LPVOID * ppv)
{
    TRACE("(%p)->(%s, %p)\n", iface, qzdebugstr_guid(riid), ppv);
 
    *ppv = NULL;
 
    if (IsEqualIID(riid, &IID_IUnknown))
        *ppv = iface;
    else if (IsEqualIID(riid, &IID_IEnumFilters))
        *ppv = iface;
 
    if (*ppv)
    {
        IUnknown_AddRef((IUnknown *)(*ppv));
        return S_OK;
    }
 
    FIXME("No interface for %s!\n", qzdebugstr_guid(riid));
 
    return E_NOINTERFACE;
}
 
static ULONG WINAPI IEnumFiltersImpl_AddRef(IEnumFilters * iface)
{
    IEnumFiltersImpl *This = impl_from_IEnumFilters(iface);
    ULONG refCount = InterlockedIncrement(&This->refCount);
 
    TRACE("(%p)->()\n", iface);
 
    return refCount;
}
 
static ULONG WINAPI IEnumFiltersImpl_Release(IEnumFilters * iface)
{
    IEnumFiltersImpl *This = impl_from_IEnumFilters(iface);
    ULONG refCount = InterlockedDecrement(&This->refCount);
 
    TRACE("(%p)->()\n", iface);
 
    if (!refCount)
    {
        IGraphVersion_Release(This->pVersionSource);
        CoTaskMemFree(This);
        return 0;
    }
    else
        return refCount;
}
 
static HRESULT WINAPI IEnumFiltersImpl_Next(IEnumFilters * iface, ULONG cFilters, IBaseFilter ** ppFilters, ULONG * pcFetched)
{
    ULONG cFetched; 
    ULONG i;
    LONG currentVersion;
    IEnumFiltersImpl *This = impl_from_IEnumFilters(iface);
    HRESULT hr;
 
    cFetched = min(*This->pNumFilters, This->uIndex + cFilters) - This->uIndex;
 
    TRACE("(%p)->(%u, %p, %p)\n", iface, cFilters, ppFilters, pcFetched);
 
    /* First of all check if the graph has changed */
    hr = IGraphVersion_QueryVersion(This->pVersionSource, &currentVersion);
    if (hr==S_OK && This->Version != currentVersion)
        return VFW_E_ENUM_OUT_OF_SYNC;
 
 
    if (!ppFilters)
        return E_POINTER;
 
    for (i = 0; i < cFetched; i++)
    {
        ppFilters[i] = (*This->pppFilters)[This->uIndex + i];
    IBaseFilter_AddRef(ppFilters[i]);
    }
 
    This->uIndex += cFetched;
 
    if (pcFetched)
        *pcFetched = cFetched;
 
    if (cFetched != cFilters)
        return S_FALSE;
    return S_OK;
}
 
static HRESULT WINAPI IEnumFiltersImpl_Skip(IEnumFilters * iface, ULONG cFilters)
{
    IEnumFiltersImpl *This = impl_from_IEnumFilters(iface);
 
    TRACE("(%p)->(%u)\n", iface, cFilters);
 
    if (This->uIndex + cFilters < *This->pNumFilters)
    {
        This->uIndex += cFilters;
        return S_OK;
    }
    return S_FALSE;
}
 
static HRESULT WINAPI IEnumFiltersImpl_Reset(IEnumFilters * iface)
{
    IEnumFiltersImpl *This = impl_from_IEnumFilters(iface);
    HRESULT hr;
    LONG currentVersion;
 
    TRACE("(%p)->()\n", iface);
 
    This->uIndex = 0;
    hr = IGraphVersion_QueryVersion(This->pVersionSource, &currentVersion);
    if (hr == S_OK)
        This->Version = currentVersion;
    return S_OK;
}
 
static HRESULT WINAPI IEnumFiltersImpl_Clone(IEnumFilters * iface, IEnumFilters ** ppEnum)
{
    HRESULT hr;
    IEnumFiltersImpl *This = impl_from_IEnumFilters(iface);
 
    TRACE("(%p)->(%p)\n", iface, ppEnum);
 
    hr = IEnumFiltersImpl_Construct(This->pVersionSource, This->pppFilters, This->pNumFilters, ppEnum);
    if (FAILED(hr))
        return hr;
    return IEnumFilters_Skip(*ppEnum, This->uIndex);
}
 
static const IEnumFiltersVtbl IEnumFiltersImpl_Vtbl =
{
    IEnumFiltersImpl_QueryInterface,
    IEnumFiltersImpl_AddRef,
    IEnumFiltersImpl_Release,
    IEnumFiltersImpl_Next,
    IEnumFiltersImpl_Skip,
    IEnumFiltersImpl_Reset,
    IEnumFiltersImpl_Clone
};