/****************************************************************************

**

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the Qt Mobility Components.

**

** $QT_BEGIN_LICENSE:LGPL$

** 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.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

****************************************************************************/

#ifndef DIRECTSHOWIOREADER_H

#define DIRECTSHOWIOREADER_H

#include <QtCore/qmutex.h>

#include <QtCore/qobject.h>

#include <QtCore/qwaitcondition.h>

#include <dshow.h>

QT_BEGIN_NAMESPACE

class QIODevice;

QT_END_NAMESPACE

class DirectShowEventLoop;

class DirectShowIOSource;

class DirectShowSampleRequest;

class DirectShowIOReader : public QObject, public IAsyncReader

{

    Q_OBJECT

public:

    DirectShowIOReader(QIODevice *device, DirectShowIOSource *source, DirectShowEventLoop *loop);

    ~DirectShowIOReader();

    // IUnknown

    HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, void **ppvObject);

    ULONG STDMETHODCALLTYPE AddRef();

    ULONG STDMETHODCALLTYPE Release();

    // IAsyncReader

    HRESULT STDMETHODCALLTYPE RequestAllocator(

            IMemAllocator *pPreferred, ALLOCATOR_PROPERTIES *pProps, IMemAllocator **ppActual);

    HRESULT STDMETHODCALLTYPE Request(IMediaSample *pSample, DWORD_PTR dwUser);

    HRESULT STDMETHODCALLTYPE WaitForNext(

            DWORD dwTimeout, IMediaSample **ppSample, DWORD_PTR *pdwUser);

    HRESULT STDMETHODCALLTYPE SyncReadAligned(IMediaSample *pSample);

    HRESULT STDMETHODCALLTYPE SyncRead(LONGLONG llPosition, LONG lLength, BYTE *pBuffer);

    HRESULT STDMETHODCALLTYPE Length(LONGLONG *pTotal, LONGLONG *pAvailable);

    HRESULT STDMETHODCALLTYPE BeginFlush();

    HRESULT STDMETHODCALLTYPE EndFlush();

protected:

    void customEvent(QEvent *event);

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;

    DirectShowSampleRequest *m_pendingTail;

    DirectShowSampleRequest *m_readyHead;

    DirectShowSampleRequest *m_readyTail;

    LONGLONG m_synchronousPosition;

    LONG m_synchronousLength;

    qint64 m_synchronousBytesRead;

    BYTE *m_synchronousBuffer;

    HRESULT m_synchronousResult;

    LONGLONG m_totalLength;

    LONGLONG m_availableLength;

    bool m_flushing;

    QMutex m_mutex;

    QWaitCondition m_wait;

};

#endif