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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef DIRECTSHOWIOREADER_H
#define DIRECTSHOWIOREADER_H
#include <dshow.h>
#include <QtCore/qmutex.h>
#include <QtCore/qobject.h>
#include <QtCore/qwaitcondition.h>
QT_BEGIN_NAMESPACE
class QIODevice;
class DirectShowEventLoop;
class DirectShowIOSource;
class DirectShowSampleRequest;
class DirectShowIOReader : public QObject, public IAsyncReader
{
Q_OBJECT
public:
DirectShowIOReader(QIODevice *device, DirectShowIOSource *source, DirectShowEventLoop *loop);
~DirectShowIOReader() override;
// IUnknown
HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, void **ppvObject) override;
ULONG STDMETHODCALLTYPE AddRef() override;
ULONG STDMETHODCALLTYPE Release() override;
// IAsyncReader
HRESULT STDMETHODCALLTYPE RequestAllocator(
IMemAllocator *pPreferred, ALLOCATOR_PROPERTIES *pProps,
IMemAllocator **ppActual) override;
HRESULT STDMETHODCALLTYPE Request(IMediaSample *pSample, DWORD_PTR dwUser) override;
HRESULT STDMETHODCALLTYPE WaitForNext(
DWORD dwTimeout, IMediaSample **ppSample, DWORD_PTR *pdwUser) override;
HRESULT STDMETHODCALLTYPE SyncReadAligned(IMediaSample *pSample) override;
HRESULT STDMETHODCALLTYPE SyncRead(LONGLONG llPosition, LONG lLength, BYTE *pBuffer) override;
HRESULT STDMETHODCALLTYPE Length(LONGLONG *pTotal, LONGLONG *pAvailable) override;
HRESULT STDMETHODCALLTYPE BeginFlush() override;
HRESULT STDMETHODCALLTYPE EndFlush() override;
protected:
void customEvent(QEvent *event) override;
private Q_SLOTS:
void readyRead();
private:
HRESULT blockingRead(LONGLONG position, LONG length, BYTE *buffer, qint64 *bytesRead);
bool nonBlockingRead(
LONGLONG position, LONG length, BYTE *buffer, qint64 *bytesRead, HRESULT *result);
void flushRequests();
DirectShowIOSource *m_source;
QIODevice *m_device;
DirectShowEventLoop *m_loop;
DirectShowSampleRequest *m_pendingHead = nullptr;
DirectShowSampleRequest *m_pendingTail = nullptr;
DirectShowSampleRequest *m_readyHead = nullptr;
DirectShowSampleRequest *m_readyTail = nullptr;
LONGLONG m_synchronousPosition = 0;
LONG m_synchronousLength = 0;
qint64 m_synchronousBytesRead = 0;
BYTE *m_synchronousBuffer = nullptr;
HRESULT m_synchronousResult = S_OK;
LONGLONG m_totalLength = 0;
LONGLONG m_availableLength = 0;
bool m_flushing = false;
QMutex m_mutex;
QWaitCondition m_wait;
};
QT_END_NAMESPACE
#endif
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