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前腐后继 发表于 2007-3-20 22:17:00

游戏中的dshow媒体播放-即学即会-详细注释

1。简单地播放文件 #include <dshow.h> #pragma comment (lib,"Ole32.lib") #pragma comment (lib,"Strmiids.lib") #define FILENAME L"C:\\Documents and Settings\\vs6\\桌面\\temp\\FL5007822001-500-2.avi" bool g_bExit=false; //this APP will be exited when g_bExit=TURE #define ture (bool)-1 int main() { IGraphBuilder *pGraphBuilder; //这是directshow的核心 IMediaControl *pMediaControl; //帮我们连接filter(媒体文件,解码器等)          //简单的说,它帮我们简单地打开和播放文件. IVideoWindow *pVideoWindow; //用这个来控制directshow的视频窗口 //COM初始化 CoInitialize(NULL); //建立FilterGraph CoCreateInstance(CLSID_FilterGraph,NULL,CLSCTX_INPROC,IID_IGraphBuilder, (LPVOID*)&pGraphBuilder);// 向directshow询问MediaControl接口: pGraphBuilder->QueryInterface(IID_IMediaControl,(LPVOID*)&pMediaControl);//建立 Graph: pMediaControl->RenderFile(FILENAME);           //向directshow询问VideoWindow接口: pGraphBuilder->QueryInterface(IID_IVideoWindow,(LPVOID*)&pVideoWindow);// 全屏： pVideoWindow->put_Visible(OATRUE); pVideoWindow->put_FullScreenMode(OATRUE);            //开始播放： pMediaControl->Run();// 等待： MessageBox(NULL,"Block Execution","Block",MB_OK);                      //停止： pMediaControl->Stop(); // release resource: pVideoWindow->Release(); pMediaControl->Release(); pGraphBuilder->Release();// COM 销毁: CoUninitialize();return 0; }

前腐后继 发表于 2007-3-20 22:17:00

2。在自己的window中循环播放。 接收到“播放结束”消息的时候，重新播放文件即可实现循环。 请建立Win32 App！ #include <dshow.h> #include <windows.h> #pragma comment (lib,"Ole32.lib") #pragma comment (lib,"Strmiids.lib")#define ture (bool)-1 //你应该替换这个文件名： #define FILENAME L"C:\\Documents and Settings\\vs6\\桌面\\temp\\FL5007822001-500-2.avi" #define WM_GRAPH_NOTIFY (WM_APP + 1) //g_pMediaEventEx的消息bool g_bExit=false; //当g_bExit=TURE 时，程序结束 HWND g_hwnd=0; //我们的播放器的主窗口 IMediaEventEx *g_pMediaEventEx; //可以从directshow接受事件消息 //当媒体播放结束后，它会通知我们 IMediaControl *g_pMediaControl; //帮我们连接过滤器（文件，解码器。。。）             //简单地说，它帮我们简单的打开和播放文件 IMediaPosition *g_pMediaPosition; //用这个来取得/设置媒体播放的位置等。void OnGraphNotify(); //当g_pMediaEventEx发消息通知我们时，我们就调用这个函数 LRESULT WINAPI WinProc(HWND hwnd,UINT msg,WPARAM wparam,LPARAM lparam);int WINAPI WinMain(HINSTANCE hInst,HINSTANCE hPrevInst,LPSTR CmdLine,int nShowCmd) { IGraphBuilder *pGraphBuilder; //directshow的核心 IVideoWindow *pVideoWindow; //用这个来控制directshow的视频窗口//COM初始化： CoInitialize(NULL);//建立FilterGraph: CoCreateInstance(CLSID_FilterGraph,NULL,CLSCTX_INPROC,IID_IGraphBuilder, (LPVOID*)&pGraphBuilder);//向directshow询问MediaControl接口: pGraphBuilder->QueryInterface(IID_IMediaControl,(LPVOID*)&g_pMediaControl);//向directshow询问MediaPosition接口: pGraphBuilder->QueryInterface(IID_IMediaPosition,(LPVOID*)&g_pMediaPosition);//向directshow询问MediaEventsEx接口: pGraphBuilder->QueryInterface(IID_IMediaEventEx,(LPVOID*)&g_pMediaEventEx);//这段代码是建立一个播放器主窗口并显示之： WNDCLASSEX wc={sizeof(WNDCLASSEX),CS_CLASSDC,WinProc,0L,0L, GetModuleHandle(0),0,0,0,0,"instemast",0}; RegisterClassEx(&wc); //我们窗口的客户区坐标： RECT rect={100,100,640+100-1,480+100-1};//width=right-left+1 , right=left+width-1 //按照窗口客户区的坐标来计算窗口的实际坐标： ::AdjustWindowRect(&rect,WS_OVERLAPPEDWINDOW,false); //注意，现在，rect的值更新了！ g_hwnd=CreateWindow("instemast","dshow",WS_OVERLAPPEDWINDOW,rect.left,rect.top, rect.right-rect.left,rect.bottom-rect.top,0,0,wc.hInstance,0); ::ShowWindow(g_hwnd,nShowCmd); //结束建立播放器主窗口//我们将使用g_hwnd来接受directshow的消息： g_pMediaEventEx->SetNotifyWindow((OAHWND)g_hwnd,WM_GRAPH_NOTIFY, NULL);//建立Graph: g_pMediaControl->RenderFile(FILENAME);//向 directshow 询问 VideoWindow 接口: pGraphBuilder->QueryInterface(IID_IVideoWindow,(LPVOID*)&pVideoWindow);pVideoWindow->put_Owner((OAHWND)g_hwnd); //视频窗口是我们g_phwnd的子窗口！ pVideoWindow->put_WindowStyle(WS_CHILD|WS_CLIPSIBLINGS); pVideoWindow->SetWindowPosition(0,0,rect.right-rect.left+1,rect.bottom-rect.top+1); pVideoWindow->put_Visible(OATRUE);//start playing media: g_pMediaControl->Run();MSG msg; do { GetMessage(&msg,0,0,0); ::TranslateMessage(&msg); ::DispatchMessage(&msg); if(msg.message==WM_GRAPH_NOTIFY)OnGraphNotify(); }while(!g_bExit); //消息循环,直到 g_bExit=TURE 时结束//释放资源: g_pMediaEventEx->Release(); pVideoWindow->Release(); g_pMediaControl->Release(); pGraphBuilder->Release();//COM 终止: CoUninitialize();return 0; }void OnGraphNotify() { long evCode; LONG param1, param2; while(SUCCEEDED(g_pMediaEventEx->GetEvent(&evCode,&param1, &param2, 0))) { g_pMediaEventEx->FreeEventParams(evCode, param1, param2); switch (evCode) { case EC_COMPLETE: //我们的媒体播放结束了 g_pMediaPosition->put_CurrentPosition(0); //重设播放位置为0，就是倒回的意思 g_pMediaControl->Run();//重新播放                                 //以上这样，就是循环播放！ break;   }; }; }LRESULT WINAPI WinProc(HWND hwnd,UINT msg,WPARAM wparam,LPARAM lparam) { switch(msg) { case WM_DESTROY: g_pMediaControl->Stop(); //停止播放 g_bExit=ture; //我们的g_hwnd被关闭了,所以我们想退出程序 break; }; return DefWindowProc(hwnd,msg,wparam,lparam);}

前腐后继 发表于 2007-3-20 22:19:00

3。进一步实现游戏中的一些需要（播放暂停，循环，Esc跳过动画播放等） 使用另一种方式循环播放： 用一个定时器，每1000ms检查一下当前播放位置，如果播放到结束，就重放一遍。 #include <dshow.h> #include <windows.h> #pragma comment (lib,"Ole32.lib") #pragma comment (lib,"Strmiids.lib")#define ture (bool)-1 //you should REPLACE the media file path #define FILENAME L"C:\\Documents and Settings\\vs6\\桌面\\temp\\FL5007822001-500-2.avi" #define WM_GRAPH_NOTIFY (WM_APP + 1) //the msg of g_pMediaEventExbool g_bExit=false; //this APP will be exited when g_bExit=TURE HWND g_hwnd=0; //our player's main window IMediaEventEx *g_pMediaEventEx; //recieve event msgs from directshow //it notifies us when the media's playing is COMPLETE  IMediaControl *g_pMediaControl; //help us to link the filters(media file,codec...), //in short,it helps us open and play a file EASILY. IMediaPosition *g_pMediaPosition; //we use this to get/set the POSITION of a media's playing double g_Len; bool g_bIsPlaying=false;LRESULT WINAPI WinProc(HWND,UINT,WPARAM,LPARAM); void WINAPI OnTimer(HWND, UINT, UINT, DWORD);int WINAPI WinMain(HINSTANCE hInst,HINSTANCE hPrevInst,LPSTR CmdLine,int nShowCmd) { IGraphBuilder *pGraphBuilder; //this is the kernel of directshow IVideoWindow *pVideoWindow; //use this to control the video window of directshow//init COM CoInitialize(NULL);//create FilterGraph: CoCreateInstance(CLSID_FilterGraph,NULL,CLSCTX_INPROC,IID_IGraphBuilder, (LPVOID*)&pGraphBuilder);//ask directshow for the MediaControl: pGraphBuilder->QueryInterface(IID_IMediaControl,(LPVOID*)&g_pMediaControl);//ask directshow for the MediaPosition: pGraphBuilder->QueryInterface(IID_IMediaPosition,(LPVOID*)&g_pMediaPosition);//ask directshow for the MediaEventEx: pGraphBuilder->QueryInterface(IID_IMediaEventEx,(LPVOID*)&g_pMediaEventEx);//start to create a window and show it WNDCLASSEX wc={sizeof(WNDCLASSEX),CS_CLASSDC,WinProc,0L,0L, GetModuleHandle(0),0,0,0,0,"instemast",0}; RegisterClassEx(&wc); //our window's CLIENT positions: RECT rect={100,100,640+100-1,480+100-1};//width=right-left+1 , right=left+width-1 //calculate our window's REAL positions from client positions: ::AdjustWindowRect(&rect,WS_OVERLAPPEDWINDOW,false); //NOW, rect's values are updated g_hwnd=CreateWindow("instemast","Esc=stop  Space=pause/play  F1=speed+  F2=speed-  F3=normal",WS_OVERLAPPEDWINDOW,rect.left,rect.top, rect.right-rect.left,rect.bottom-rect.top,0,0,wc.hInstance,0); ::ShowWindow(g_hwnd,nShowCmd); //end of creating window//we will recieve directshow's msg by g_hwnd: g_pMediaEventEx->SetNotifyWindow((OAHWND)g_hwnd,WM_GRAPH_NOTIFY, NULL);//create Graph: g_pMediaControl->RenderFile(FILENAME);//get our media's length: g_pMediaPosition->get_Duration(&g_Len);//ask directshow for the VideoWindow interface: pGraphBuilder->QueryInterface(IID_IVideoWindow,(LPVOID*)&pVideoWindow);pVideoWindow->put_Owner((OAHWND)g_hwnd); //VIDEOwindow is the child of OUR g_hwnd pVideoWindow->put_WindowStyle(WS_CHILD|WS_CLIPSIBLINGS); pVideoWindow->SetWindowPosition(0,0,rect.right-rect.left+1,rect.bottom-rect.top+1); pVideoWindow->put_Visible(OATRUE);//start playing media: g_pMediaControl->Run(); g_bIsPlaying=ture;::SetTimer(g_hwnd,0,1000,&OnTimer); MSG msg; do { GetMessage(&msg,0,0,0); ::TranslateMessage(&msg); ::DispatchMessage(&msg); }while(!g_bExit); //do msg loop,until g_bExit=TURE//release the resource: g_pMediaEventEx->Release(); pVideoWindow->Release(); g_pMediaControl->Release(); pGraphBuilder->Release();//COM destroy: CoUninitialize();return 0; }LRESULT WINAPI WinProc(HWND hwnd,UINT msg,WPARAM wparam,LPARAM lparam) { double rate; switch(msg) { case WM_KEYDOWN: switch(wparam) { case 27: // key--Stop media g_pMediaControl->Stop(); //stop media g_bIsPlaying=false;//show FIRST frame: g_pMediaPosition->put_CurrentPosition(0); g_pMediaControl->Run(); ::Sleep(2); g_pMediaControl->Pause();//stop media: g_pMediaPosition->put_CurrentPosition(0); g_pMediaControl->Stop(); break; case ' ': //pause or resume or play if(g_bIsPlaying) { g_pMediaControl->Pause(); g_bIsPlaying=false; } else { g_pMediaControl->Run(); g_bIsPlaying=ture; }; break; case VK_F1: //rate(speed): 1.0=normal g_pMediaPosition->get_Rate(&rate); g_pMediaPosition->put_Rate(rate*1.25); break; case VK_F2: g_pMediaPosition->get_Rate(&rate); g_pMediaPosition->put_Rate(rate*0.8); break; case VK_F3: g_pMediaPosition->put_Rate(1.0); }; break; case WM_DESTROY: g_pMediaControl->Stop(); //stop our media g_bIsPlaying=false; g_bExit=ture; //our g_hwnd has been closed,so we want to exit the app break; }; return DefWindowProc(hwnd,msg,wparam,lparam); }void WINAPI OnTimer(HWND hwnd, UINT, UINT, DWORD) { double pos; g_pMediaPosition->get_CurrentPosition(&pos); if(pos>=g_Len) { g_pMediaPosition->put_CurrentPosition(0); g_pMediaControl->Run(); }; }

zhigu 发表于 2007-3-31 12:53:00

ding !

aaaaaaaa 发表于 2007-4-29 09:39:00

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游戏中的dshow媒体播放-即学即会-详细注释