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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "directshowmediatypelist.h"
#include "directshowmediatype.h"
#include "videosurfacefilter.h"
class DirectShowMediaTypeEnum : public IEnumMediaTypes
{
public:
DirectShowMediaTypeEnum(DirectShowMediaTypeList *list, int token, int index = 0);
~DirectShowMediaTypeEnum();
// IUnknown
HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, void **ppvObject);
ULONG STDMETHODCALLTYPE AddRef();
ULONG STDMETHODCALLTYPE Release();
// IEnumMediaTypes
HRESULT STDMETHODCALLTYPE Next(
ULONG cMediaTypes, AM_MEDIA_TYPE **ppMediaTypes, ULONG *pcFetched);
HRESULT STDMETHODCALLTYPE Skip(ULONG cMediaTypes);
HRESULT STDMETHODCALLTYPE Reset();
HRESULT STDMETHODCALLTYPE Clone(IEnumMediaTypes **ppEnum);
private:
LONG m_ref;
DirectShowMediaTypeList *m_list;
int m_mediaTypeToken;
int m_index;
};
DirectShowMediaTypeEnum::DirectShowMediaTypeEnum(
DirectShowMediaTypeList *list, int token, int index)
: m_ref(1)
, m_list(list)
, m_mediaTypeToken(token)
, m_index(index)
{
m_list->AddRef();
}
DirectShowMediaTypeEnum::~DirectShowMediaTypeEnum()
{
m_list->Release();
}
HRESULT DirectShowMediaTypeEnum::QueryInterface(REFIID riid, void **ppvObject)
{
if (!ppvObject) {
return E_POINTER;
} else if (riid == IID_IUnknown
|| riid == IID_IEnumMediaTypes) {
*ppvObject = static_cast<IEnumMediaTypes *>(this);
} else {
*ppvObject = 0;
return E_NOINTERFACE;
}
AddRef();
return S_OK;
}
ULONG DirectShowMediaTypeEnum::AddRef()
{
return InterlockedIncrement(&m_ref);
}
ULONG DirectShowMediaTypeEnum::Release()
{
ULONG ref = InterlockedDecrement(&m_ref);
if (ref == 0) {
delete this;
}
return ref;
}
HRESULT DirectShowMediaTypeEnum::Next(
ULONG cMediaTypes, AM_MEDIA_TYPE **ppMediaTypes, ULONG *pcFetched)
{
return m_list->nextMediaType(m_mediaTypeToken, &m_index, cMediaTypes, ppMediaTypes, pcFetched);
}
HRESULT DirectShowMediaTypeEnum::Skip(ULONG cMediaTypes)
{
return m_list->skipMediaType(m_mediaTypeToken, &m_index, cMediaTypes);
}
HRESULT DirectShowMediaTypeEnum::Reset()
{
m_mediaTypeToken = m_list->currentMediaTypeToken();
m_index = 0;
return S_OK;
}
HRESULT DirectShowMediaTypeEnum::Clone(IEnumMediaTypes **ppEnum)
{
return m_list->cloneMediaType(m_mediaTypeToken, m_index, ppEnum);
}
DirectShowMediaTypeList::DirectShowMediaTypeList()
: m_mediaTypeToken(0)
{
}
IEnumMediaTypes *DirectShowMediaTypeList::createMediaTypeEnum()
{
return new DirectShowMediaTypeEnum(this, m_mediaTypeToken, 0);
}
void DirectShowMediaTypeList::setMediaTypes(const QVector<AM_MEDIA_TYPE> &types)
{
++m_mediaTypeToken;
m_mediaTypes = types;
}
int DirectShowMediaTypeList::currentMediaTypeToken()
{
return m_mediaTypeToken;
}
HRESULT DirectShowMediaTypeList::nextMediaType(
int token, int *index, ULONG count, AM_MEDIA_TYPE **types, ULONG *fetchedCount)
{
if (!types || (count != 1 && !fetchedCount)) {
return E_POINTER;
} else if (m_mediaTypeToken != token) {
return VFW_E_ENUM_OUT_OF_SYNC;
} else {
int boundedCount = qBound<int>(0, count, m_mediaTypes.count() - *index);
for (int i = 0; i < boundedCount; ++i, ++(*index)) {
types[i] = reinterpret_cast<AM_MEDIA_TYPE *>(CoTaskMemAlloc(sizeof(AM_MEDIA_TYPE)));
if (types[i]) {
DirectShowMediaType::copy(types[i], m_mediaTypes.at(*index));
} else {
for (--i; i >= 0; --i)
CoTaskMemFree(types[i]);
if (fetchedCount)
*fetchedCount = 0;
return E_OUTOFMEMORY;
}
}
if (fetchedCount)
*fetchedCount = boundedCount;
return boundedCount == count ? S_OK : S_FALSE;
}
}
HRESULT DirectShowMediaTypeList::skipMediaType(int token, int *index, ULONG count)
{
if (m_mediaTypeToken != token) {
return VFW_E_ENUM_OUT_OF_SYNC;
} else {
*index = qMin<int>(*index + count, m_mediaTypes.size());
return *index < m_mediaTypes.size() ? S_OK : S_FALSE;
}
}
HRESULT DirectShowMediaTypeList::cloneMediaType(int token, int index, IEnumMediaTypes **enumeration)
{
if (m_mediaTypeToken != token) {
return VFW_E_ENUM_OUT_OF_SYNC;
} else {
*enumeration = new DirectShowMediaTypeEnum(this, token, index);
return S_OK;
}
}
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