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/* This file is part of the KDE project.
Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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 or 3 of the License.
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, see <http://www.gnu.org/licenses/>.
*/
#ifndef PHONON_QASYNCREADER_H
#define PHONON_QASYNCREADER_H
#include <QtCore/QWaitCondition>
#include <QtCore/QQueue>
#include <QtCore/QMutex>
#include "qpin.h"
QT_BEGIN_NAMESPACE
namespace Phonon
{
namespace DS9
{
//his class reads asynchronously from a QIODevice
class QAsyncReader : public QPin, public IAsyncReader
{
public:
QAsyncReader(QBaseFilter *, const QVector<AM_MEDIA_TYPE> &mediaTypes);
~QAsyncReader();
//reimplementation from IUnknown
STDMETHODIMP QueryInterface(REFIID iid, void** out);
STDMETHODIMP_(ULONG) AddRef();
STDMETHODIMP_(ULONG) Release();
//reimplementation from IAsyncReader
STDMETHODIMP RequestAllocator(IMemAllocator *,ALLOCATOR_PROPERTIES *,IMemAllocator **);
STDMETHODIMP Request(IMediaSample *,DWORD_PTR);
STDMETHODIMP WaitForNext(DWORD,IMediaSample **,DWORD_PTR *);
STDMETHODIMP SyncReadAligned(IMediaSample *);
STDMETHODIMP SyncRead(LONGLONG,LONG,BYTE *);
virtual STDMETHODIMP Length(LONGLONG *,LONGLONG *) = 0;
STDMETHODIMP BeginFlush();
STDMETHODIMP EndFlush();
protected:
virtual HRESULT read(LONGLONG pos, LONG length, BYTE *buffer, LONG *actual) = 0;
private:
struct AsyncRequest
{
AsyncRequest(IMediaSample *s = 0, DWORD_PTR u = 0) : sample(s), user(u) {}
IMediaSample *sample;
DWORD_PTR user;
};
AsyncRequest getNextRequest();
QMutex m_mutexWait;
QQueue<AsyncRequest> m_requestQueue;
QWaitCondition m_requestWait;
};
}
}
QT_END_NAMESPACE
#endif
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