player.h
Cette rubrique contient du code pour le tutoriel Comment lire des fichiers multimédias avec Media Foundation.
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.
//
// Copyright (c) Microsoft Corporation. All rights reserved.
#ifndef PLAYER_H
#define PLAYER_H
#include <new>
#include <windows.h>
#include <shobjidl.h>
#include <shlwapi.h>
#include <assert.h>
#include <strsafe.h>
// Media Foundation headers
#include <mfapi.h>
#include <mfidl.h>
#include <mferror.h>
#include <evr.h>
#include "resource.h"
template <class T> void SafeRelease(T **ppT)
{
if (*ppT)
{
(*ppT)->Release();
*ppT = NULL;
}
}
const UINT WM_APP_PLAYER_EVENT = WM_APP + 1;
// WPARAM = IMFMediaEvent*, WPARAM = MediaEventType
enum PlayerState
{
Closed = 0, // No session.
Ready, // Session was created, ready to open a file.
OpenPending, // Session is opening a file.
Started, // Session is playing a file.
Paused, // Session is paused.
Stopped, // Session is stopped (ready to play).
Closing // Application has closed the session, but is waiting for MESessionClosed.
};
class CPlayer : public IMFAsyncCallback
{
public:
static HRESULT CreateInstance(HWND hVideo, HWND hEvent, CPlayer **ppPlayer);
// IUnknown methods
STDMETHODIMP QueryInterface(REFIID iid, void** ppv);
STDMETHODIMP_(ULONG) AddRef();
STDMETHODIMP_(ULONG) Release();
// IMFAsyncCallback methods
STDMETHODIMP GetParameters(DWORD*, DWORD*)
{
// Implementation of this method is optional.
return E_NOTIMPL;
}
STDMETHODIMP Invoke(IMFAsyncResult* pAsyncResult);
// Playback
HRESULT OpenURL(const WCHAR *sURL);
HRESULT Play();
HRESULT Pause();
HRESULT Stop();
HRESULT Shutdown();
HRESULT HandleEvent(UINT_PTR pUnkPtr);
PlayerState GetState() const { return m_state; }
// Video functionality
HRESULT Repaint();
HRESULT ResizeVideo(WORD width, WORD height);
BOOL HasVideo() const { return (m_pVideoDisplay != NULL); }
protected:
// Constructor is private. Use static CreateInstance method to instantiate.
CPlayer(HWND hVideo, HWND hEvent);
// Destructor is private. Caller should call Release.
virtual ~CPlayer();
HRESULT Initialize();
HRESULT CreateSession();
HRESULT CloseSession();
HRESULT StartPlayback();
// Media event handlers
virtual HRESULT OnTopologyStatus(IMFMediaEvent *pEvent);
virtual HRESULT OnPresentationEnded(IMFMediaEvent *pEvent);
virtual HRESULT OnNewPresentation(IMFMediaEvent *pEvent);
// Override to handle additional session events.
virtual HRESULT OnSessionEvent(IMFMediaEvent*, MediaEventType)
{
return S_OK;
}
protected:
long m_nRefCount; // Reference count.
IMFMediaSession *m_pSession;
IMFMediaSource *m_pSource;
IMFVideoDisplayControl *m_pVideoDisplay;
HWND m_hwndVideo; // Video window.
HWND m_hwndEvent; // App window to receive events.
PlayerState m_state; // Current state of the media session.
HANDLE m_hCloseEvent; // Event to wait on while closing.
};
#endif PLAYER_H
Rubriques connexes
Commentaires
https://aka.ms/ContentUserFeedback.
Bientôt disponible : Tout au long de 2024, nous allons supprimer progressivement GitHub Issues comme mécanisme de commentaires pour le contenu et le remplacer par un nouveau système de commentaires. Pour plus d’informations, consultezEnvoyer et afficher des commentaires pour