qt-everywhere-src-5.15.1/qtmultimedia/src/plugins/wmf/sourceresolver.h

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#ifndef SOURCERESOLVER_H
#define SOURCERESOLVER_H

#include "mfstream.h"
#include "qmediaresource.h"

class SourceResolver: public QObject, public IMFAsyncCallback
{
    Q_OBJECT
public:
    SourceResolver();

    ~SourceResolver();

    STDMETHODIMP QueryInterface(REFIID riid, LPVOID *ppvObject);
    STDMETHODIMP_(ULONG) AddRef(void);
    STDMETHODIMP_(ULONG) Release(void);

    HRESULT STDMETHODCALLTYPE Invoke(IMFAsyncResult *pAsyncResult);

    HRESULT STDMETHODCALLTYPE GetParameters(DWORD*, DWORD*);

    void load(const QUrl &url, QIODevice* stream);

    void cancel();

    void shutdown();

    IMFMediaSource* mediaSource() const;

Q_SIGNALS:
    void error(long hr);
    void mediaSourceReady();

private:
    class State : public IUnknown
    {
    public:
        State(IMFSourceResolver *sourceResolver, bool fromStream);
        ~State();

        STDMETHODIMP QueryInterface(REFIID riid, LPVOID *ppvObject);

        STDMETHODIMP_(ULONG) AddRef(void);

        STDMETHODIMP_(ULONG) Release(void);

        IMFSourceResolver* sourceResolver() const;
        bool fromStream() const;

    private:
        long m_cRef;
        IMFSourceResolver *m_sourceResolver;
        bool m_fromStream;
    };

    long              m_cRef;
    IUnknown          *m_cancelCookie;
    IMFSourceResolver *m_sourceResolver;
    IMFMediaSource    *m_mediaSource;
    MFStream          *m_stream;
    QMutex            m_mutex;
};

#endif