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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "directshowpinenum.h"
#include <QtMultimedia>
QT_BEGIN_NAMESPACE
DirectShowPinEnum::DirectShowPinEnum(const QList<IPin *> &pins)
: m_ref(1)
, m_pins(pins)
, m_index(0)
{
foreach (IPin *pin, m_pins)
pin->AddRef();
}
DirectShowPinEnum::~DirectShowPinEnum()
{
foreach (IPin *pin, m_pins)
pin->Release();
}
HRESULT DirectShowPinEnum::QueryInterface(REFIID riid, void **ppvObject)
{
if (riid == IID_IUnknown
|| riid == IID_IEnumPins) {
AddRef();
*ppvObject = static_cast<IEnumPins *>(this);
return S_OK;
} else {
*ppvObject = 0;
return E_NOINTERFACE;
}
}
ULONG DirectShowPinEnum::AddRef()
{
return InterlockedIncrement(&m_ref);
}
ULONG DirectShowPinEnum::Release()
{
ULONG ref = InterlockedDecrement(&m_ref);
if (ref == 0) {
delete this;
}
return ref;
}
HRESULT DirectShowPinEnum::Next(ULONG cPins, IPin **ppPins, ULONG *pcFetched)
{
if (ppPins && (pcFetched || cPins == 1)) {
ULONG count = qBound<ULONG>(0, cPins, m_pins.count() - m_index);
for (ULONG i = 0; i < count; ++i, ++m_index) {
ppPins[i] = m_pins.at(m_index);
ppPins[i]->AddRef();
}
if (pcFetched)
*pcFetched = count;
return count == cPins ? S_OK : S_FALSE;
} else {
return E_POINTER;
}
}
HRESULT DirectShowPinEnum::Skip(ULONG cPins)
{
m_index = qMin(int(m_index + cPins), m_pins.count());
return m_index < m_pins.count() ? S_OK : S_FALSE;
}
HRESULT DirectShowPinEnum::Reset()
{
m_index = 0;
return S_OK;
}
HRESULT DirectShowPinEnum::Clone(IEnumPins **ppEnum)
{
if (ppEnum) {
*ppEnum = new DirectShowPinEnum(m_pins);
return S_OK;
} else {
return E_POINTER;
}
}
QT_END_NAMESPACE
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