video.h

[与此页面关联的功能（DirectShow）是一项旧功能。 它已被 MediaPlayer、IMFMediaEngine取代，并在媒体基金会 音频/视频捕获。 这些功能已针对 Windows 10 和 Windows 11 进行了优化。 Microsoft强烈建议新代码尽可能使用 MediaPlayer、IMFMediaEngine 和 Media Foundation 中的音频/视频捕获，而不是 DirectShow。 Microsoft建议重写使用旧 API 的现有代码，以尽可能使用新 API。]

本主题包含 DirectShow 中音频/视频播放教程的代码。

// 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();
};

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