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    41 

    42 #ifndef DIRECTSHOWIOREADER_H

    43 #define DIRECTSHOWIOREADER_H

    44 

    45 #include <QtCore/qmutex.h>

    46 #include <QtCore/qobject.h>

    47 #include <QtCore/qwaitcondition.h>

    48 

    49 #include <dshow.h>

    50 

    51 QT_BEGIN_NAMESPACE

    52 class QIODevice;

    53 QT_END_NAMESPACE

    54 

    55 class DirectShowEventLoop;

    56 class DirectShowIOSource;

    57 class DirectShowSampleRequest;

    58 

    59 class DirectShowIOReader : public QObject, public IAsyncReader

    60 {

    61     Q_OBJECT

    62 public:

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

    64     ~DirectShowIOReader();

    65 

    66     // IUnknown

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

    68     ULONG STDMETHODCALLTYPE AddRef();

    69     ULONG STDMETHODCALLTYPE Release();

    70 

    71     // IAsyncReader

    72     HRESULT STDMETHODCALLTYPE RequestAllocator(

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

    74 

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

    76 

    77     HRESULT STDMETHODCALLTYPE WaitForNext(

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

    79 

    80     HRESULT STDMETHODCALLTYPE SyncReadAligned(IMediaSample *pSample);

    81 

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

    83 

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

    85 

    86     HRESULT STDMETHODCALLTYPE BeginFlush();

    87     HRESULT STDMETHODCALLTYPE EndFlush();

    88 

    89 protected:

    90     void customEvent(QEvent *event);

    91 

    92 private Q_SLOTS:

    93     void readyRead();

    94 

    95 private:

    96     HRESULT blockingRead(LONGLONG position, LONG length, BYTE *buffer, qint64 *bytesRead);

    97     bool nonBlockingRead(

    98             LONGLONG position, LONG length, BYTE *buffer, qint64 *bytesRead, HRESULT *result);

    99     void flushRequests();

   100 

   101     DirectShowIOSource *m_source;

   102     QIODevice *m_device;

   103     DirectShowEventLoop *m_loop;

   104     DirectShowSampleRequest *m_pendingHead;

   105     DirectShowSampleRequest *m_pendingTail;

   106     DirectShowSampleRequest *m_readyHead;

   107     DirectShowSampleRequest *m_readyTail;

   108     LONGLONG m_synchronousPosition;

   109     LONG m_synchronousLength;

   110     qint64 m_synchronousBytesRead;

   111     BYTE *m_synchronousBuffer;

   112     HRESULT m_synchronousResult;

   113     LONGLONG m_totalLength;

   114     LONGLONG m_availableLength;

   115     bool m_flushing;

   116     QMutex m_mutex;

   117     QWaitCondition m_wait;

   118 };

   119 

   120 #endif