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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
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**
**
****************************************************************************/
#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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