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596 lines
18 KiB
596 lines
18 KiB
/* reverse.c - WinMain() and WndProc() for REVERSE, along with
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* initialization and support code.
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*
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* REVERSE is a Windows with Multimedia sample application that
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* illustrates how to use the low-level waveform playback services.
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* It also shows how to use the multimedia file I/O services to read
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* data from a WAVE file.
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*
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* REVERSE plays a WAVE waveform audio file backwards.
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*
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* (C) Copyright Microsoft Corp. 1991, 1992. All rights reserved.
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*
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* You have a royalty-free right to use, modify, reproduce and
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* distribute the Sample Files (and/or any modified version) in
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* any way you find useful, provided that you agree that
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* Microsoft has no warranty obligations or liability for any
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* Sample Application Files which are modified.
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*
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*/
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#include <windows.h>
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#include <mmsystem.h>
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#include "reverse.h"
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#define MAX_FILENAME_SIZE 128
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/* Global variables.
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*/
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char szAppName[] = "Reverse"; // application name
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HANDLE hInstApp = NULL; // instance handle
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HWND hwndApp = NULL; // main window handle
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HWND hwndName = NULL; // filename window handle
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HWND hwndPlay = NULL; // "Play" button window handle
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HWND hwndQuit = NULL; // "Exit" button window handle
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HWAVEOUT hWaveOut = NULL;
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LPWAVEHDR lpWaveHdr = NULL;
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VOID cleanup(LPWAVEINST lpWaveInst);
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/* WinMain - Entry point for Reverse.
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*/
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int PASCAL WinMain(HANDLE hInst, HANDLE hPrev, LPSTR szCmdLine, int cmdShow)
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{
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MSG msg;
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WNDCLASS wc;
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hInstApp = hInst;
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/* Define and register a window class for the main window.
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*/
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if (!hPrev)
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{
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wc.hCursor = LoadCursor(NULL, IDC_ARROW);
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wc.hIcon = LoadIcon(hInst, szAppName);
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wc.lpszMenuName = szAppName;
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wc.lpszClassName = szAppName;
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wc.hbrBackground = GetStockObject(LTGRAY_BRUSH);
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wc.hInstance = hInst;
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wc.style = 0;
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wc.lpfnWndProc = WndProc;
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wc.cbWndExtra = 0;
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wc.cbClsExtra = 0;
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if (!RegisterClass(&wc))
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return FALSE;
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}
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/* Create and show the main window.
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*/
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hwndApp = CreateWindow (szAppName, // class name
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szAppName, // caption
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WS_OVERLAPPEDWINDOW, // style bits
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CW_USEDEFAULT, // x position
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CW_USEDEFAULT, // y position
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WMAIN_DX, // x size
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WMAIN_DY, // y size
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(HWND)NULL, // parent window
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(HMENU)NULL, // use class menu
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(HANDLE)hInst, // instance handle
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(LPSTR)NULL // no params to pass on
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);
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/* Create child windows for the "Play" and "Exit" buttons
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* and for an edit field to enter filenames.
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*/
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hwndPlay = CreateWindow( "BUTTON", "Play",
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WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
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PLAY_X, PLAY_Y,
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PLAY_DX, PLAY_DY,
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hwndApp, (HMENU)IDB_PLAY, hInstApp, NULL );
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if( !hwndPlay )
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return( FALSE );
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hwndQuit = CreateWindow( "BUTTON", "Exit",
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WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
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QUIT_X, QUIT_Y,
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QUIT_DX, QUIT_DY,
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hwndApp, (HMENU)IDB_QUIT, hInstApp, NULL );
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if( !hwndQuit )
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return( FALSE );
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hwndName = CreateWindow("EDIT","",
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WS_CHILD|WS_VISIBLE|WS_BORDER|ES_AUTOHSCROLL,
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NAME_X, NAME_Y,
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NAME_DX, NAME_DY,
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hwndApp, (HMENU)IDE_NAME, hInstApp, NULL);
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if( !hwndName )
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return( FALSE );
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SendMessage(hwndName, EM_LIMITTEXT, MAX_FILENAME_SIZE - 1, 0);
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ShowWindow(hwndApp,cmdShow);
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/* Add about dialog to system menu.
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*/
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AppendMenu(GetSystemMenu(hwndApp, 0),
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MF_STRING | MF_ENABLED, IDM_ABOUT, "About Reverse...");
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/* The main message processing loop. Nothing special here.
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*/
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while (GetMessage(&msg,NULL,0,0))
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{
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TranslateMessage(&msg);
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DispatchMessage(&msg);
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}
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return msg.wParam;
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}
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/* WndProc - Main window procedure function.
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*/
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LONG FAR PASCAL WndProc(HWND hWnd, unsigned msg, UINT wParam, LONG lParam)
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{
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FARPROC fpfn;
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LPWAVEINST lpWaveInst;
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switch (msg)
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{
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case WM_DESTROY:
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if (hWaveOut)
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{
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waveOutReset(hWaveOut);
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waveOutUnprepareHeader(hWaveOut, lpWaveHdr, sizeof(WAVEHDR) );
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lpWaveInst = (LPWAVEINST) lpWaveHdr->dwUser;
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cleanup(lpWaveInst);
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waveOutClose(hWaveOut);
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}
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PostQuitMessage(0);
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break;
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case WM_SYSCOMMAND:
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switch (LOWORD(wParam))
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{
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case IDM_ABOUT:
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/* Show ABOUTBOX dialog box.
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*/
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fpfn = MakeProcInstance((FARPROC)AppAbout, hInstApp); // no op in 32 bit
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DialogBox(hInstApp, "ABOUTBOX", hWnd, (DLGPROC)fpfn);
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FreeProcInstance(fpfn);
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break;
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}
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break;
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/* Process messages sent by the child window controls.
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*/
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case WM_SETFOCUS:
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SetFocus(hwndName);
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return 0;
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case WM_COMMAND:
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switch (LOWORD(wParam))
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{
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case IDE_NAME: // filename edit control
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return( 0L );
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case IDB_PLAY: // "Play" button
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if (HIWORD(wParam) == BN_CLICKED)
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ReversePlay();
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break;
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case IDB_QUIT: // "Exit" button
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if (HIWORD(wParam) == BN_CLICKED)
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PostQuitMessage(0);
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break;
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}
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return( 0L );
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case MM_WOM_DONE:
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/* This message indicates a waveform data block has
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* been played and can be freed. Clean up the preparation
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* done previously on the header.
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*/
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waveOutUnprepareHeader( (HWAVEOUT) wParam,
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(LPWAVEHDR) lParam, sizeof(WAVEHDR) );
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/* Get a pointer to the instance data, then unlock and free
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* all memory associated with the data block, including the
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* memory for the instance data itself.
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*/
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lpWaveInst = (LPWAVEINST) ((LPWAVEHDR)lParam)->dwUser;
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cleanup(lpWaveInst);
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/* Close the waveform output device.
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*/
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waveOutClose( (HWAVEOUT) wParam );
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/* Reenable both button controls.
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*/
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EnableWindow( hwndPlay, TRUE );
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EnableWindow( hwndQuit, TRUE );
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SetFocus(hwndName);
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break;
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}
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return DefWindowProc(hWnd,msg,wParam,lParam);
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}
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/* AppAbout -- Dialog procedure for ABOUTBOX dialog box.
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*/
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BOOL FAR PASCAL AppAbout(HWND hDlg, unsigned msg, unsigned wParam, LONG lParam)
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{
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switch (msg)
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{
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case WM_COMMAND:
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if (LOWORD(wParam) == IDOK)
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EndDialog(hDlg,TRUE);
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break;
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case WM_INITDIALOG:
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return TRUE;
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}
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return FALSE;
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}
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/* ReversePlay - Gets a filename from the edit control, then uses
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* the multimedia file I/O services to read data from the requested
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* WAVE file. If the file is a proper WAVE file, ReversePlay() calls
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* the Interchange() function to reverse the order of the waveform
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* samples in the file. It then plays the reversed waveform data.
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*
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* Note that ReversePlay() only handles a single waveform data block.
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* If the requested WAVE file will not fit in a single data block, it
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* will not be played. The size of a single data block depends on the
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* amount of available system memory.
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*
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* Params: void
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*
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* Return: void
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*/
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void ReversePlay()
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{
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HANDLE hWaveHdr;
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LPWAVEINST lpWaveInst;
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HMMIO hmmio;
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MMCKINFO mmckinfoParent;
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MMCKINFO mmckinfoSubchunk;
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DWORD dwFmtSize;
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char szFileName[ MAX_FILENAME_SIZE ];
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HANDLE hFormat;
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WAVEFORMAT *pFormat;
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DWORD dwDataSize;
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HPSTR hpch1, hpch2;
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WORD wBlockSize;
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HANDLE hWaveInst;
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HANDLE hData = NULL;
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HPSTR lpData = NULL;
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/* Get the filename from the edit control.
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*/
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if (!GetWindowText( hwndName, (LPSTR)szFileName, MAX_FILENAME_SIZE))
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{
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MessageBox(hwndApp, "Failed to Get Filename",
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NULL, MB_OK | MB_ICONEXCLAMATION);
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return;
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}
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/* Open the given file for reading using buffered I/O.
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*/
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if(!(hmmio = mmioOpen(szFileName, NULL, MMIO_READ | MMIO_ALLOCBUF)))
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{
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MessageBox(hwndApp, "Failed to open file.",
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NULL, MB_OK | MB_ICONEXCLAMATION);
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return;
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}
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/* Locate a 'RIFF' chunk with a 'WAVE' form type
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* to make sure it's a WAVE file.
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*/
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mmckinfoParent.fccType = mmioFOURCC('W', 'A', 'V', 'E');
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if (mmioDescend(hmmio, (LPMMCKINFO) &mmckinfoParent, NULL, MMIO_FINDRIFF))
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{
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MessageBox(hwndApp, "This is not a WAVE file.",
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NULL, MB_OK | MB_ICONEXCLAMATION);
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mmioClose(hmmio, 0);
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return;
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}
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/* Now, find the format chunk (form type 'fmt '). It should be
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* a subchunk of the 'RIFF' parent chunk.
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*/
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mmckinfoSubchunk.ckid = mmioFOURCC('f', 'm', 't', ' ');
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if (mmioDescend(hmmio, &mmckinfoSubchunk, &mmckinfoParent,
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MMIO_FINDCHUNK))
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{
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MessageBox(hwndApp, "WAVE file is corrupted.",
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NULL, MB_OK | MB_ICONEXCLAMATION);
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mmioClose(hmmio, 0);
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return;
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}
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/* Get the size of the format chunk, allocate and lock memory for it.
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*/
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dwFmtSize = mmckinfoSubchunk.cksize;
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hFormat = LocalAlloc(LMEM_MOVEABLE, LOWORD(dwFmtSize));
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if (!hFormat)
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{
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MessageBox(hwndApp, "Out of memory.",
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NULL, MB_OK | MB_ICONEXCLAMATION);
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mmioClose(hmmio, 0);
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return;
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}
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pFormat = (WAVEFORMAT *) LocalLock(hFormat);
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if (!pFormat)
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{
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MessageBox(hwndApp, "Failed to lock memory for format chunk.",
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NULL, MB_OK | MB_ICONEXCLAMATION);
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LocalFree( hFormat );
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mmioClose(hmmio, 0);
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return;
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}
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/* Read the format chunk.
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*/
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if (mmioRead(hmmio, (HPSTR) pFormat, dwFmtSize) != (LONG) dwFmtSize)
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{
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MessageBox(hwndApp, "Failed to read format chunk.",
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NULL, MB_OK | MB_ICONEXCLAMATION);
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LocalUnlock( hFormat );
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LocalFree( hFormat );
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mmioClose(hmmio, 0);
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return;
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}
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/* Make sure it's a PCM file.
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*/
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if (pFormat->wFormatTag != WAVE_FORMAT_PCM)
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{
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LocalUnlock( hFormat );
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LocalFree( hFormat );
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mmioClose(hmmio, 0);
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MessageBox(hwndApp, "The file is not a PCM file.",
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NULL, MB_OK | MB_ICONEXCLAMATION);
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return;
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}
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/* Make sure a waveform output device supports this format.
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*/
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if (waveOutOpen(&hWaveOut, WAVE_MAPPER, (LPWAVEFORMAT)pFormat, 0L, 0L,
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WAVE_FORMAT_QUERY))
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{
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LocalUnlock( hFormat );
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LocalFree( hFormat );
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mmioClose(hmmio, 0);
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MessageBox(hwndApp, "The waveform device can't play this format.",
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NULL, MB_OK | MB_ICONEXCLAMATION);
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return;
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}
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/* Ascend out of the format subchunk.
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*/
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mmioAscend(hmmio, &mmckinfoSubchunk, 0);
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/* Find the data subchunk.
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*/
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mmckinfoSubchunk.ckid = mmioFOURCC('d', 'a', 't', 'a');
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if (mmioDescend(hmmio, &mmckinfoSubchunk, &mmckinfoParent,
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MMIO_FINDCHUNK))
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{
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MessageBox(hwndApp, "WAVE file has no data chunk.",
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NULL, MB_OK | MB_ICONEXCLAMATION);
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LocalUnlock( hFormat );
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LocalFree( hFormat );
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mmioClose(hmmio, 0);
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return;
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}
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/* Get the size of the data subchunk.
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*/
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dwDataSize = mmckinfoSubchunk.cksize;
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if (dwDataSize == 0L)
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{
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MessageBox(hwndApp, "The data chunk has no data.",
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NULL, MB_OK | MB_ICONEXCLAMATION);
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LocalUnlock( hFormat );
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LocalFree( hFormat );
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mmioClose(hmmio, 0);
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return;
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}
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/* Open a waveform output device.
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*/
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if (waveOutOpen((LPHWAVEOUT)&hWaveOut, WAVE_MAPPER,
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(LPWAVEFORMAT)pFormat, (UINT)hwndApp, 0L, CALLBACK_WINDOW))
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{
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MessageBox(hwndApp, "Failed to open waveform output device.",
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NULL, MB_OK | MB_ICONEXCLAMATION);
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LocalUnlock( hFormat );
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LocalFree( hFormat );
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mmioClose(hmmio, 0);
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return;
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}
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/* Save block alignment info for later use.
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*/
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wBlockSize = pFormat->nBlockAlign;
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/* We're done with the format header, free it.
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*/
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LocalUnlock( hFormat );
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LocalFree( hFormat );
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/* Allocate and lock memory for the waveform data.
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*/
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hData = GlobalAlloc(GMEM_MOVEABLE , dwDataSize );
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/* GMEM_SHARE is not needed on 32 bits */
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if (!hData)
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{
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MessageBox(hwndApp, "Out of memory.",
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NULL, MB_OK | MB_ICONEXCLAMATION);
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mmioClose(hmmio, 0);
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return;
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}
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lpData = GlobalLock(hData);
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if (!lpData)
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{
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MessageBox(hwndApp, "Failed to lock memory for data chunk.",
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NULL, MB_OK | MB_ICONEXCLAMATION);
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GlobalFree( hData );
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mmioClose(hmmio, 0);
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return;
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}
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/* Read the waveform data subchunk.
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*/
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if(mmioRead(hmmio, (HPSTR) lpData, dwDataSize) != (LONG) dwDataSize)
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{
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MessageBox(hwndApp, "Failed to read data chunk.",
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NULL, MB_OK | MB_ICONEXCLAMATION);
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GlobalUnlock( hData );
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GlobalFree( hData );
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mmioClose(hmmio, 0);
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return;
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}
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/* We're done with the file, close it.
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*/
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mmioClose(hmmio, 0);
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/* Reverse the sound for playing.
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*/
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hpch1 = lpData;
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hpch2 = lpData + dwDataSize - 1;
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while (hpch1 < hpch2)
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{
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Interchange( hpch1, hpch2, wBlockSize );
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hpch1 += wBlockSize;
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hpch2 -= wBlockSize;
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}
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/* Allocate a waveform data header. The WAVEHDR must be
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* globally allocated and locked.
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*/
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hWaveHdr = GlobalAlloc(GMEM_MOVEABLE, (DWORD) sizeof(WAVEHDR));
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if (!hWaveHdr)
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{
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GlobalUnlock( hData );
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GlobalFree( hData );
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MessageBox(hwndApp, "Not enough memory for header.",
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NULL, MB_OK | MB_ICONEXCLAMATION);
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return;
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}
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lpWaveHdr = (LPWAVEHDR) GlobalLock(hWaveHdr);
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if (!lpWaveHdr)
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{
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GlobalUnlock( hData );
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GlobalFree( hData );
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GlobalFree( hWaveHdr );
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MessageBox(hwndApp, "Failed to lock memory for header.",
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NULL, MB_OK | MB_ICONEXCLAMATION);
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return;
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}
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/* Allocate and set up instance data for waveform data block.
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* This information is needed by the routine that frees the
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* data block after it has been played.
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*/
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hWaveInst = GlobalAlloc(GMEM_MOVEABLE, (DWORD) sizeof(WAVEHDR));
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if (!hWaveInst)
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{
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GlobalUnlock( hData );
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GlobalFree( hData );
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GlobalUnlock( hWaveHdr );
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GlobalFree( hWaveHdr );
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MessageBox(hwndApp, "Not enough memory for instance data.",
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NULL, MB_OK | MB_ICONEXCLAMATION);
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return;
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}
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lpWaveInst = (LPWAVEINST) GlobalLock(hWaveInst);
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if (!lpWaveInst)
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{
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GlobalUnlock( hData );
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GlobalFree( hData );
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GlobalUnlock( hWaveHdr );
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GlobalFree( hWaveHdr );
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GlobalFree( hWaveInst );
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MessageBox(hwndApp, "Failed to lock memory for instance data.",
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NULL, MB_OK | MB_ICONEXCLAMATION);
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return;
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}
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lpWaveInst->hWaveInst = hWaveInst;
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lpWaveInst->hWaveHdr = hWaveHdr;
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lpWaveInst->hWaveData = hData;
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/* Set up WAVEHDR structure and prepare it to be written to wave device.
|
|
*/
|
|
lpWaveHdr->lpData = lpData;
|
|
lpWaveHdr->dwBufferLength = dwDataSize;
|
|
lpWaveHdr->dwFlags = 0L;
|
|
lpWaveHdr->dwLoops = 0L;
|
|
lpWaveHdr->dwUser = (DWORD) lpWaveInst;
|
|
if(waveOutPrepareHeader(hWaveOut, lpWaveHdr, sizeof(WAVEHDR)))
|
|
{
|
|
GlobalUnlock( hData );
|
|
GlobalFree( hData );
|
|
GlobalUnlock( hWaveHdr );
|
|
GlobalFree( hWaveHdr );
|
|
GlobalUnlock( hWaveInst );
|
|
GlobalFree( hWaveInst );
|
|
MessageBox(hwndApp, "Unable to prepare wave header.",
|
|
NULL, MB_OK | MB_ICONEXCLAMATION);
|
|
|
|
return;
|
|
}
|
|
|
|
/* Then the data block can be sent to the output device.
|
|
*/
|
|
{ MMRESULT mmResult;
|
|
mmResult = waveOutWrite(hWaveOut, lpWaveHdr, sizeof(WAVEHDR));
|
|
if (mmResult != 0)
|
|
{
|
|
waveOutUnprepareHeader( hWaveOut, lpWaveHdr, sizeof(WAVEHDR));
|
|
GlobalUnlock( hData );
|
|
GlobalFree( hData );
|
|
MessageBox(hwndApp, "Failed to write block to device",
|
|
NULL, MB_OK | MB_ICONEXCLAMATION);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* Disable input to the button controls.
|
|
*/
|
|
EnableWindow(hwndPlay, FALSE);
|
|
EnableWindow(hwndQuit, FALSE);
|
|
}
|
|
|
|
/* Interchange - Interchanges two samples at the given positions.
|
|
*
|
|
* Params: hpchPos1 - Points to one sample.
|
|
* hpchPos2 - Points to the other sample.
|
|
* wLength - The length of a sample in bytes.
|
|
*
|
|
* Return: void
|
|
*/
|
|
void Interchange(HPSTR hpchPos1, HPSTR hpchPos2, unsigned uLength)
|
|
{
|
|
unsigned uPlace;
|
|
BYTE bTemp;
|
|
|
|
for (uPlace = 0; uPlace < uLength; uPlace++)
|
|
{
|
|
bTemp = hpchPos1[uPlace];
|
|
hpchPos1[uPlace] = hpchPos2[uPlace];
|
|
hpchPos2[uPlace] = bTemp;
|
|
}
|
|
}
|
|
|
|
VOID cleanup(LPWAVEINST lpWaveInst)
|
|
{
|
|
GlobalUnlock( lpWaveInst->hWaveData );
|
|
GlobalFree( lpWaveInst->hWaveData );
|
|
GlobalUnlock( lpWaveInst->hWaveHdr );
|
|
GlobalFree( lpWaveInst->hWaveHdr );
|
|
GlobalUnlock( lpWaveInst->hWaveInst );
|
|
GlobalFree( lpWaveInst->hWaveInst );
|
|
}
|