win音视频--Dshow视频采集显示

最新推荐文章于 2025-05-19 19:41:12 发布

Qyee16

最新推荐文章于 2025-05-19 19:41:12 发布

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分类专栏： VC && MFC 音视频

本文链接：https://blog.youkuaiyun.com/Qyee16/article/details/12072743

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本文提供了一个简单的音视频基础程序，演示了如何使用DShow创建窗口并显示视频。从窗口创建、COM初始化到视频显示，逐步指导入门者了解DShow音视频开发的基本流程。

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一个粗糙的显示小程序，完成了窗口的创建，com的初始化及dshow视频的显示。dshow的文章虽说不少，但不适合入门，从小到大，有能运行的程序然后慢慢的完善，就是入门。一个入门的小程序，希望像我一样的同学门，找到希望，找到dshow音视频开发的大门。先贴出来文章，然后整理。

#include "stdafx.h"
#include <DShow.h>
#include <Guiddef.h>
#include <strmif.h>

#define CHECK_HR(s)	if (FAILED(s)) {return 1;}
#define SAFE_RELEASE(p)     do { if ((p)) { (p)->Release(); (p) = NULL; } } while(0)

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);

#pragma comment(lib, "Dxguid.lib")
#pragma comment(lib, "Strmiids.lib")

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
	WNDCLASSEX wcex;

	wcex.cbSize = sizeof(WNDCLASSEX);
	wcex.style          = CS_HREDRAW | CS_VREDRAW;
	wcex.lpfnWndProc    = WndProc;
	wcex.cbClsExtra     = 0;
	wcex.cbWndExtra     = 0;
	wcex.hInstance      = hInstance;
	wcex.hIcon          = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_APPLICATION));
	wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
	wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
	wcex.lpszMenuName   = NULL;
	wcex.lpszClassName  = _T("aaaaa");
	wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_APPLICATION));

	if (!RegisterClassEx(&wcex))
	{
		MessageBox(NULL, _T("Call to RegisterClassEx failed!"),_T("Win32 Guided Tour"), NULL);

		return 1;
	}

	IGraphBuilder		  *m_pGraph;
	ICaptureGraphBuilder2 *m_pBuild;
	IBaseFilter			  *m_pSrc;
	IMediaControl         *m_pMediaControl;
	IVideoWindow          *m_pVidWin;

	CoInitialize(NULL);
	int nRes = 0;
	HRESULT hr =CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void**)&m_pGraph);
	CHECK_HR(1);

	hr = CoCreateInstance(CLSID_CaptureGraphBuilder2, NULL,CLSCTX_INPROC_SERVER, IID_ICaptureGraphBuilder2, (void**)&m_pBuild);
	CHECK_HR(2);

	hr = m_pBuild->SetFiltergraph(m_pGraph);
	CHECK_HR(3);

	hr = m_pGraph->QueryInterface(IID_IVideoWindow, (void **)&m_pVidWin);
	CHECK_HR(4);

	ICreateDevEnum *pDevEnum=NULL;
	IEnumMoniker *pClsEnum=NULL;
	IMoniker *pMoniker = NULL;
	//创建设备枚举COM对象
	hr = CoCreateInstance(CLSID_SystemDeviceEnum,NULL,CLSCTX_INPROC,IID_ICreateDevEnum,(void **)&pDevEnum);
	CHECK_HR(5);

	//创建视频采集设备枚举COM对象
	hr = pDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory,&pClsEnum,0);
	CHECK_HR(6);

	int i = 0;
	while(i <= 0)
	{
		hr = pClsEnum->Next(1,&pMoniker,NULL);
		++i;
	}
	CHECK_HR(7);

	hr = pMoniker->BindToObject(0,0,IID_IBaseFilter,(void **)&m_pSrc);
	CHECK_HR(8);

	SAFE_RELEASE(pMoniker);
	SAFE_RELEASE(pClsEnum);
	SAFE_RELEASE(pDevEnum);


	//将设备添加到管理器graph
	hr = m_pGraph->AddFilter(m_pSrc, L"Video Capture");
	CHECK_HR(9);

	hr=m_pBuild->RenderStream(&PIN_CATEGORY_PREVIEW,&MEDIATYPE_Video,m_pSrc,NULL,NULL);
	CHECK_HR(10);

	HWND m_hWnd = ::CreateWindowA("STATIC","ds_video_preview",WS_POPUP,100,100,500,500,NULL,NULL,NULL,NULL);
	ShowWindow(m_hWnd,	nCmdShow);
	UpdateWindow(m_hWnd);


	if (m_hWnd == NULL)
	{
		nRes = 11;
	}

	m_pVidWin->put_Owner((OAHWND)m_hWnd);
	m_pVidWin->SetWindowPosition(100, 100, 500, 500);
	m_pVidWin->put_WindowStyle(WS_CHILD | WS_CLIPSIBLINGS);

	hr = m_pGraph->QueryInterface(IID_IMediaControl, (void **)&m_pMediaControl);
	CHECK_HR(12);

	hr = m_pMediaControl->Run();
	

	MSG msg;
	while (GetMessage(&msg, NULL, 0, 0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	return (int) msg.wParam;

}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	PAINTSTRUCT ps;
	HDC hdc;
	TCHAR greeting[] = _T("Hello, World!");

	switch (message)
	{
	case WM_PAINT:
		hdc = BeginPaint(hWnd, &ps);
		TextOut(hdc,5, 5,greeting, _tcslen(greeting));
		EndPaint(hWnd, &ps);
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hWnd, message, wParam, lParam);
		break;
	}

	return 0;
}

环境：vs2008 + win7 + directx90