Condividi tramite

video.h

  • Articolo

[La funzionalità associata a questa pagina, DirectShow, è una funzionalità legacy. È stata sostituita da MediaPlayer, IMFMediaEngine e Audio/Video Capture in Media Foundation. Queste funzionalità sono state ottimizzate per Windows 10 e Windows 11. Microsoft consiglia vivamente che il nuovo codice usi MediaPlayer, IMFMediaEngine e Audio/Video Capture in Media Foundation invece di DirectShow, quando possibile. Microsoft suggerisce che il codice esistente che usa le API legacy venga riscritto per usare le nuove API, se possibile.

Questo argomento contiene il codice per l'esercitazione Riproduzione audio/video in DirectShow.

// 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.

#pragma once

#include <windows.h>
#include <dshow.h>
#include <d3d9.h>
#include <Vmr9.h>
#include <Evr.h>

template <class T> void SafeRelease(T **ppT)
{
    if (*ppT)
    {
        (*ppT)->Release();
        *ppT = NULL;
    }
}

HRESULT RemoveUnconnectedRenderer(IGraphBuilder *pGraph, IBaseFilter *pRenderer, BOOL *pbRemoved);
HRESULT AddFilterByCLSID(IGraphBuilder *pGraph, REFGUID clsid, IBaseFilter **ppF, LPCWSTR wszName);

// Abstract class to manage the video renderer filter.
// Specific implementations handle the VMR-7, VMR-9, or EVR filter.

class CVideoRenderer
{
public:
    virtual ~CVideoRenderer() {};
    virtual BOOL    HasVideo() const = 0;
    virtual HRESULT AddToGraph(IGraphBuilder *pGraph, HWND hwnd) = 0;
    virtual HRESULT FinalizeGraph(IGraphBuilder *pGraph) = 0;
    virtual HRESULT UpdateVideoWindow(HWND hwnd, const LPRECT prc) = 0;
    virtual HRESULT Repaint(HWND hwnd, HDC hdc) = 0;
    virtual HRESULT DisplayModeChanged() = 0;
};

// Manages the VMR-7 video renderer filter.

class CVMR7 : public CVideoRenderer
{
    IVMRWindowlessControl   *m_pWindowless;

public:
    CVMR7();
    ~CVMR7();
    BOOL    HasVideo() const;
    HRESULT AddToGraph(IGraphBuilder *pGraph, HWND hwnd);
    HRESULT FinalizeGraph(IGraphBuilder *pGraph);
    HRESULT UpdateVideoWindow(HWND hwnd, const LPRECT prc);
    HRESULT Repaint(HWND hwnd, HDC hdc);
    HRESULT DisplayModeChanged();
};


// Manages the VMR-9 video renderer filter.

class CVMR9 : public CVideoRenderer
{
    IVMRWindowlessControl9 *m_pWindowless;

public:
    CVMR9();
    ~CVMR9();
    BOOL    HasVideo() const;
    HRESULT AddToGraph(IGraphBuilder *pGraph, HWND hwnd);
    HRESULT FinalizeGraph(IGraphBuilder *pGraph);
    HRESULT UpdateVideoWindow(HWND hwnd, const LPRECT prc);
    HRESULT Repaint(HWND hwnd, HDC hdc);
    HRESULT DisplayModeChanged();
};


// Manages the EVR video renderer filter.

class CEVR : public CVideoRenderer
{
    IBaseFilter            *m_pEVR;
    IMFVideoDisplayControl *m_pVideoDisplay;

public:
    CEVR();
    ~CEVR();
    BOOL    HasVideo() const;
    HRESULT AddToGraph(IGraphBuilder *pGraph, HWND hwnd);
    HRESULT FinalizeGraph(IGraphBuilder *pGraph);
    HRESULT UpdateVideoWindow(HWND hwnd, const LPRECT prc);
    HRESULT Repaint(HWND hwnd, HDC hdc);
    HRESULT DisplayModeChanged();
};

Riproduzione audio/video in DirectShow

Esempio di riproduzione DirectShow