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# pragma once
# include <mfapi.h>
# include <mfidl.h>
# include "utility/com_ptr.h"
# include "utility/optional.h"
class MediaPlayer;
typedef void (*MediaPlayerEventCallback)(MediaPlayer* player, com_ptr<IMFMediaEvent>, MediaEventType);
class MediaPlayer:
private IMFAsyncCallback
{
public:
enum State
{
Closed = 0, // no session
Ready, // session was created, ready to open file
OpenPending, // session is opening a file
Started, // session is playing a file
Paused, // session is paused
Stopped, // session is stopped (but ready to play)
Closing // session was closed, waiting for async callback
};
static HRESULT Create(MediaPlayerEventCallback eventCallback, MediaPlayer** outMediaPlayer);
// IUnknown
virtual ULONG STDMETHODCALLTYPE AddRef() override;
virtual ULONG STDMETHODCALLTYPE Release() override;
virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, void** object) override;
HRESULT OpenURL(const wchar_t* url);
HRESULT Play();
HRESULT Pause();
HRESULT Stop();
HRESULT Shutdown();
State GetState() const;
void SetMasterVolume(float volume);
float GetMasterVolume() const;
void SetReplayGain(float replayGain);
float GetReplayGain() const;
optional<float> GetPresentationTime() const;
optional<float> GetDuration() const;
void SetUserData(void* userData);
void* GetUserData() const;
HRESULT HandleEvent(IMFMediaEvent* mediaEvent);
protected:
MediaPlayer(MediaPlayerEventCallback eventCallback);
virtual ~MediaPlayer();
HRESULT Initialize();
HRESULT CreateSession();
HRESULT CloseSession();
HRESULT StartPlayback();
HRESULT ApplyTopology();
HRESULT ApplyMasterVolume(float volume);
HRESULT ApplyReplayGain(float replayGain);
const com_ptr<IMFMediaSession>& GetMediaSession() const { return m_MediaSession; }
const com_ptr<IMFMediaSource>& GetMediaSource() const { return m_MediaSource; }
virtual HRESULT OnTopologyStatus(IMFMediaEvent* mediaEvent);
virtual HRESULT OnPresentationEnded(IMFMediaEvent* mediaEvent);
virtual HRESULT OnNewPresentation(IMFMediaEvent* mediaEvent);
// Override to handle additional session events.
virtual HRESULT OnSessionEvent(IMFMediaEvent* mediaEvent, MediaEventType mediaEventType);
virtual HRESULT OnStateChange(State state, State previousState);
private:
// IMFAsyncCallback
virtual HRESULT STDMETHODCALLTYPE GetParameters(DWORD* flags, DWORD* queue);
virtual HRESULT STDMETHODCALLTYPE Invoke(IMFAsyncResult* asyncResult);
HRESULT SetState(State state);
ULONG m_RefCount;
com_ptr<IMFSourceResolver> m_SourceResolver;
com_ptr<IUnknown> m_CancelCookie;
com_ptr<IMFMediaSession> m_MediaSession;
com_ptr<IMFMediaSource> m_MediaSource;
com_ptr<IMFSimpleAudioVolume> m_SimpleAudioVolume;
com_ptr<IMFPresentationClock> m_PresentationClock;
com_ptr<IMFAudioStreamVolume> m_StreamAudioVolume;
optional<float> m_SetMasterVolume;
mutable float m_MasterVolume;
mutable float m_ReplayGain;
MediaPlayerEventCallback m_EventCallback;
void* m_UserData;
State m_State;
HANDLE m_CloseEvent;
};
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