playback.h

  • 项目

[与此页面关联的功能 DirectShow 是一项旧功能。 它已被 MediaPlayer、 IMFMediaEngine 和 媒体基金会中的音频/视频捕获取代。 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。 如果可能，Microsoft 建议重写使用旧 API 的现有代码以使用新 API。]

本主题包含 DirectShow 中的音频/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

class CVideoRenderer;

enum PlaybackState
{
    STATE_NO_GRAPH,
    STATE_RUNNING,
    STATE_PAUSED,
    STATE_STOPPED,
};

const UINT WM_GRAPH_EVENT = WM_APP + 1;

typedef void (CALLBACK *GraphEventFN)(HWND hwnd, long eventCode, LONG_PTR param1, LONG_PTR param2);

class DShowPlayer
{
public:
    DShowPlayer(HWND hwnd);
    ~DShowPlayer();

    PlaybackState State() const { return m_state; }

    HRESULT OpenFile(PCWSTR pszFileName);
    
    HRESULT Play();
    HRESULT Pause();
    HRESULT Stop();

    BOOL    HasVideo() const;
    HRESULT UpdateVideoWindow(const LPRECT prc);
    HRESULT Repaint(HDC hdc);
    HRESULT DisplayModeChanged();

    HRESULT HandleGraphEvent(GraphEventFN pfnOnGraphEvent);

private:
    HRESULT InitializeGraph();
    void    TearDownGraph();
    HRESULT CreateVideoRenderer();
    HRESULT RenderStreams(IBaseFilter *pSource);

    PlaybackState   m_state;

    HWND m_hwnd; // Video window. This window also receives graph events.

    IGraphBuilder   *m_pGraph;
    IMediaControl   *m_pControl;
    IMediaEventEx   *m_pEvent;
    CVideoRenderer  *m_pVideo;
};

DirectShow 中的音频/视频播放

DirectShow 播放示例