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#ifndef DIRECTSHOWSAMPLESCHEDULER_H
#define DIRECTSHOWSAMPLESCHEDULER_H

#include <QtCore/qmutex.h>
#include <QtCore/qobject.h>
#include <QtCore/qsemaphore.h>

#include <dshow.h>

class DirectShowTimedSample;

class DirectShowSampleScheduler : public QObject, public IMemInputPin
{
    Q_OBJECT
public:

    enum State
    {
        Stopped  = 0x00,
        Running  = 0x01,
        Paused   = 0x02,
        RunMask  = 0x03,
        Flushing = 0x04
    };

    DirectShowSampleScheduler(IUnknown *pin, QObject *parent = 0);
    ~DirectShowSampleScheduler();

    // IUnknown
    HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, void **ppvObject);
    ULONG STDMETHODCALLTYPE AddRef();
    ULONG STDMETHODCALLTYPE Release();

    // IMemInputPin
    HRESULT STDMETHODCALLTYPE GetAllocator(IMemAllocator **ppAllocator);
    HRESULT STDMETHODCALLTYPE NotifyAllocator(IMemAllocator *pAllocator, BOOL bReadOnly);
    HRESULT STDMETHODCALLTYPE GetAllocatorRequirements(ALLOCATOR_PROPERTIES *pProps);

    HRESULT STDMETHODCALLTYPE Receive(IMediaSample *pSample);
    HRESULT STDMETHODCALLTYPE ReceiveMultiple(IMediaSample **pSamples, long nSamples, long *nSamplesProcessed);
    HRESULT STDMETHODCALLTYPE ReceiveCanBlock();

    void run(REFERENCE_TIME startTime);
    void pause();
    void stop();
    void setFlushing(bool flushing);

    IReferenceClock *clock() const { return m_clock; }
    void setClock(IReferenceClock *clock);

    bool schedule(IMediaSample *sample);
    bool scheduleEndOfStream();

    IMediaSample *takeSample(bool *eos);

    bool event(QEvent *event);

Q_SIGNALS:
    void sampleReady();

private:
    IUnknown *m_pin;
    IReferenceClock *m_clock;
    IMemAllocator *m_allocator;
    DirectShowTimedSample *m_head;
    DirectShowTimedSample *m_tail;
    int m_maximumSamples;
    int m_state;
    REFERENCE_TIME m_startTime;
    HANDLE m_timeoutEvent;
    HANDLE m_flushEvent;
    QSemaphore m_semaphore;
    QMutex m_mutex;
};

#endif
