player.h
Este tópico contém código para o tutorial Como reproduzir arquivos de mídia com o 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