/*  This file is part of the KDE project.+
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Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).+
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+
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This library is free software: you can redistribute it and/or modify+
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it under the terms of the GNU Lesser General Public License as published by+
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the Free Software Foundation, either version 2.1 or 3 of the License.+
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+
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This library is distributed in the hope that it will be useful,+
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but WITHOUT ANY WARRANTY; without even the implied warranty of+
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the+
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GNU Lesser General Public License for more details.+
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+
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You should have received a copy of the GNU Lesser General Public License+
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along with this library.  If not, see <http://www.gnu.org/licenses/>.+
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*/+
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+
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#ifndef PHONON_QASYNCREADER_H+
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#define PHONON_QASYNCREADER_H+
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+
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#include <QtCore/QWaitCondition>+
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#include <QtCore/QQueue>+
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#include <QtCore/QMutex>+
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+
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#include "qpin.h"+
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+
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QT_BEGIN_NAMESPACE+
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+
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namespace Phonon+
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{+
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    namespace DS9+
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    {+
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        //his class reads asynchronously from a QIODevice+
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        class QAsyncReader : public QPin, public IAsyncReader+
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        {+
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        public:+
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            QAsyncReader(QBaseFilter *, const QVector<AM_MEDIA_TYPE> &mediaTypes);+
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            ~QAsyncReader();+
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+
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            //reimplementation from IUnknown+
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            STDMETHODIMP QueryInterface(REFIID iid, void** out);+
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            STDMETHODIMP_(ULONG) AddRef();+
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            STDMETHODIMP_(ULONG) Release();+
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+
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            //reimplementation from IAsyncReader+
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            STDMETHODIMP RequestAllocator(IMemAllocator *,ALLOCATOR_PROPERTIES *,IMemAllocator **);+
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            STDMETHODIMP Request(IMediaSample *,DWORD_PTR);+
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            STDMETHODIMP WaitForNext(DWORD,IMediaSample **,DWORD_PTR *);+
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            STDMETHODIMP SyncReadAligned(IMediaSample *);+
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            STDMETHODIMP SyncRead(LONGLONG,LONG,BYTE *);+
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            STDMETHODIMP Length(LONGLONG *,LONGLONG *) = 0;+
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            STDMETHODIMP BeginFlush();+
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            STDMETHODIMP EndFlush();+
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+
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        protected:+
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            STDMETHODIMP syncReadAlignedUnlocked(IMediaSample *);+
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            virtual HRESULT read(LONGLONG pos, LONG length, BYTE *buffer, LONG *actual) = 0;+
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+
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        private:+
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            struct AsyncRequest+
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            {+
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                AsyncRequest(IMediaSample *s = 0, DWORD_PTR u = 0) : sample(s), user(u) {}+
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                IMediaSample *sample;+
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                DWORD_PTR user;+
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            };+
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+
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            QQueue<AsyncRequest> m_requestQueue;+
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            QWaitCondition m_requestWait;+
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        };+
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    }+
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}+
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+
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QT_END_NAMESPACE+
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+
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#endif+
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