article_directshow02.zip_directshow player_directshow video_vide

// DShowTut2.cpp : Defines the entry point for the application. // #include <windows.h> #include <stdio.h> #include "resource.h" #include <streams.h> #define WM_GRAPHEVENT WM_USER // define a custom window message for graph events // convenient macro for releasing interfaces #define HELPER_RELEASE(x) if (x != NULL) \ { \ x->Release(); \ x = NULL; \ } // DirectShow interfaces IGraphBuilder* g_pGraphBuilder = NULL; IMediaControl* g_pMediaControl = NULL; IMediaEventEx* g_pMediaEvent = NULL; IMediaPosition* g_pMediaPosition = NULL; HINSTANCE g_AppInstance; HWND g_AppWindow; BOOL g_Looping = FALSE; // should we loop the media char g_ExecuteDir[MAX_PATH]; // directory of execution char g_WindowTitle[] = "DShowTut2"; // text for title bar int InitDirectShow() { HRESULT hr; hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void**)&g_pGraphBuilder); if (FAILED(hr)) return -1; g_pGraphBuilder->QueryInterface(IID_IMediaControl, (void**)&g_pMediaControl); g_pGraphBuilder->QueryInterface(IID_IMediaEvent, (void**)&g_pMediaEvent); g_pGraphBuilder->QueryInterface(IID_IMediaPosition, (void**)&g_pMediaPosition); g_pMediaEvent->SetNotifyWindow((OAHWND)g_AppWindow, WM_GRAPHEVENT, 0); g_pMediaEvent->SetNotifyFlags(0); // turn on notifications return 0; } void CleanUpDirectShow() { HELPER_RELEASE(g_pMediaPosition); HELPER_RELEASE(g_pMediaEvent); HELPER_RELEASE(g_pMediaControl); HELPER_RELEASE(g_pGraphBuilder); } int CreateGraph(char* filename) { int length; // length of filename WCHAR* wfilename; // where we store WCHAR version of filename HRESULT hr; HANDLE logfile; // log file for graphbuilder char logfilename[MAX_PATH]; // full path and name of log file // create graphbuilder's log file; we must give it a full path or // else it will create the log file in the directory the media file is // located in sprintf(logfilename, "%s\\graph.log", g_ExecuteDir); logfile = CreateFile(logfilename, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); g_pGraphBuilder->SetLogFile(logfile); // attempt to build a graph length = strlen(filename)+1; wfilename = new WCHAR[length]; MultiByteToWideChar(CP_ACP, 0, filename, -1, wfilename, length); hr = g_pGraphBuilder->RenderFile(wfilename, NULL); CloseHandle(logfile); if (FAILED(hr)) return -1; else return 0; } // called when directshow events occur void OnGraphEvent() { long EventCode, Param1, Param2; while (g_pMediaEvent->GetEvent(&EventCode, &Param1, &Param2, 0) != E_ABORT) { switch (EventCode) { case EC_COMPLETE: // here when media is completely done playing if (!g_Looping) g_pMediaControl->Stop(); g_pMediaPosition->put_CurrentPosition(0); // reset to beginning break; default: break; } g_pMediaEvent->FreeEventParams(EventCode, Param1, Param2); } } LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) { switch (uMsg) { case WM_COMMAND: switch (LOWORD(wParam)) { case ID_FILE_OPEN: OPENFILENAME ofn; // use common 'Open' control char file[MAX_PATH]; // filename with path char filetitle[MAX_PATH]; // thrown in to show file in title bar memset(file, 0, MAX_PATH); memset(&ofn, 0, sizeof(OPENFILENAME)); ofn.lStructSize = sizeof(OPENFILENAME); ofn.hwndOwner = NULL; ofn.lpstrFile = file; ofn.nMaxFile = MAX_PATH-1; ofn.lpstrFileTitle = filetitle; ofn.nMaxFileTitle = MAX_PATH-1; ofn.Flags = OFN_FILEMUSTEXIST | OFN_PATHMUSTEXIST; if (GetOpenFileName(&ofn)) { CleanUpDirectShow(); // release previous graph if (InitDirectShow() != 0) MessageBox(NULL, "Could not initialize DirectShow!", "ERROR", MB_OK); else { if (CreateGraph(file) != 0) MessageBox(NULL, "Could not create a filter graph for this file!", "ERROR", MB_OK); else { char NewTitle[256]; sprintf(NewTitle, "%s - %s", g_WindowTitle, filetitle); SetWindowText(g_AppWindow, NewTitle); } } } break; case ID_FILE_EXIT: PostQuitMessage(0); break; case ID_MEDIA_PLAY: if (g_pMediaControl) g_pMediaControl->Run(); else MessageBox(NULL, "Select a file to play first!", g_WindowTitle, MB_OK); break; case ID_MEDIA_STOP: if (g_pMediaPosition) { g_pMediaControl->Stop(); g_pMediaPosition->put_CurrentPosition(0); // return to beginning } break; case ID_OPTIONS_LOOPING: if (g_Looping) { CheckMenuItem(GetMenu(g_AppWindow), ID_OPTIONS_LOOPING, MF_BYCOMMAND | MF_UNCHECKED); g_Looping = FALSE; } else { CheckMenuItem(GetMenu(g_AppWindow), ID_OPTIONS_LOOPING, MF_BYCOMMAND | MF_CHECKED); g_Looping = TRUE; } break; default: break; } break; case WM_SYSCOMMAND: if (wParam == SC_CLOSE) PostQuitMessage(0); break; case WM_GRAPHEVENT: OnGraphEvent(); // handles events break; default: break; } return DefWindowProc(hwnd, uMsg, wParam, lParam); } int InitApp() { WNDCLASSEX wc; CoInitialize(NULL); memset(&wc,0, sizeof(wc)); wc.cbSize = sizeof(wc); wc.lpfnWndProc = WindowProc; wc.hInstance = g_AppInstance; wc.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH); wc.lpszMenuName = MAKEINTRESOURCE(IDR_MENU1); wc.lpszClassName = "DShowTut2 Class"; RegisterClassEx(&wc); g_AppWindow = CreateWindowEx(0, "DShowTut2 Class", g_WindowTitle, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 300, 100, NULL, NULL, g_AppInstance, NULL); if (g_AppWindow == NULL) return -1; CheckMenuItem(GetMenu(g_AppWindow), ID_OPTIONS_LOOPING, MF_BYCOMMAND | MF_UNCHECKED); ShowWindow(g_AppWindow, SW_SHOW); // save directory for log file later GetCurrentDirectory(MAX_PATH, g_ExecuteDir); return 0; } int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { MSG msg; g_AppInstance = hInstance; if (InitApp() != 0) return -1; while (GetMessage(&msg, NULL, 0, 0) != 0) { TranslateMessage(&msg); DispatchMessage(&msg); } CleanUpDirectShow(); CoUninitialize(); return 0; }