VC 开源 MCI 播放库

/*------------------------------------------------------------------------- SINEWAVE.C -- Multimedia Windows Sine Wave Generator (c) Charles Petzold, 1998 --------------------------------------------------------------------------*/ #include <windows.h> #include <math.h> #include "resource.h" #define SAMPLE_RATE 11025 #define FREQ_MIN 20 #define FREQ_MAX 5000 #define FREQ_INIT 440 #define OUT_BUFFER_SIZE 4096 #define PI 3.14159 BOOL CALLBACK DlgProc (HWND, UINT, WPARAM, LPARAM) ; TCHAR szAppName [] = TEXT ("SineWave") ; int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { if (-1 == DialogBox (hInstance, szAppName, NULL, DlgProc)) { MessageBox ( NULL, TEXT ("This program requires Windows NT!"), szAppName, MB_ICONERROR) ; } return 0 ; } VOID FillBuffer (PBYTE pBuffer, int iFreq) { static double fAngle ; int i ; for (i = 0 ; i < OUT_BUFFER_SIZE ; i++) { pBuffer [i] = (BYTE) (127 + 127 * sin (fAngle)) ; fAngle += 2 * PI * iFreq / SAMPLE_RATE ; if ( fAngle > 2 * PI) fAngle -= 2 * PI ; } } BOOL CALLBACK DlgProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { static BOOL bShutOff, bClosing; static HWAVEOUT hWaveOut; static HWND hwndScroll; static int iFreq=FREQ_INIT; static PBYTE pBuffer1, pBuffer2; static PWAVEHDR pWaveHdr1, pWaveHdr2; static WAVEFORMATEX waveformat; int iDummy; switch (message) { case WM_INITDIALOG: hwndScroll = GetDlgItem (hwnd, IDC_SCROLL) ; SetScrollRange(hwndScroll, SB_CTL, FREQ_MIN, FREQ_MAX, FALSE) ; SetScrollPos (hwndScroll, SB_CTL, FREQ_INIT, TRUE) ; SetDlgItemInt (hwnd, IDC_TEXT, FREQ_INIT, FALSE) ; return TRUE ; case WM_HSCROLL: switch (LOWORD (wParam)) { case SB_LINELEFT: iFreq -= 1 ; break ; case SB_LINERIGHT: iFreq += 1 ; break ; case SB_PAGELEFT: iFreq /= 2 ; break ; case SB_PAGERIGHT: iFreq *= 2 ; break ; case SB_THUMBTRACK: iFreq = HIWORD (wParam) ; break ; case SB_TOP: GetScrollRange (hwndScroll, SB_CTL, &iFreq, &iDummy) ; break ; case SB_BOTTOM: GetScrollRange (hwndScroll, SB_CTL, &iDummy, &iFreq) ; break ; } iFreq = max (FREQ_MIN, min (FREQ_MAX, iFreq)) ; SetScrollPos (hwndScroll, SB_CTL, iFreq, TRUE) ; SetDlgItemInt (hwnd, IDC_TEXT, iFreq, FALSE) ; return TRUE ; case WM_COMMAND: switch (LOWORD (wParam)) { case IDC_ONOFF: // If turning on waveform, hWaveOut is NULL if (hWaveOut == NULL) { // Allocate memory for 2 headers and 2 buffers pWaveHdr1 = malloc (sizeof (WAVEHDR)) ; pWaveHdr2 = malloc (sizeof (WAVEHDR)) ; pBuffer1 = malloc (OUT_BUFFER_SIZE) ; pBuffer2 = malloc (OUT_BUFFER_SIZE) ; if (!pWaveHdr1 || !pWaveHdr2 || !pBuffer1 || !pBuffer2) { if (!pWaveHdr1) free (pWaveHdr1) ; if (!pWaveHdr2) free (pWaveHdr2) ; if (!pBuffer1) free (pBuffer1) ; if (!pBuffer2) free (pBuffer2) ; MessageBeep (MB_ICONEXCLAMATION) ; MessageBox (hwnd, TEXT ("Error allocating memory!"), szAppName, MB_ICONEXCLAMATION | MB_OK) ; return TRUE ; } // Variable to indicate Off button pressed bShutOff = FALSE ; // Open waveform audio for output waveformat.wFormatTag = WAVE_FORMAT_PCM ; waveformat.nChannels = 1 ; waveformat.nSamplesPerSec = SAMPLE_RATE ; waveformat.nAvgBytesPerSec = SAMPLE_RATE ; waveformat.nBlockAlign = 1 ; waveformat.wBitsPerSample = 8 ; waveformat.cbSize = 0 ; if (waveOutOpen (&hWaveOut, WAVE_MAPPER, &waveformat, (DWORD)hwnd, 0, CALLBACK_WINDOW)!= MMSYSERR_NOERROR) { free (pWaveHdr1) ; free (pWaveHdr2) ; free (pBuffer1) ; free (pBuffer2) ; hWaveOut = NULL ; MessageBeep (MB_ICONEXCLAMATION) ; MessageBox (hwnd, TEXT ("Error opening waveform audio device!"), szAppName, MB_ICONEXCLAMATION | MB_OK) ; return TRUE ; } // Set up headers and prepare them pWaveHdr1->lpData = pBuffer1 ; pWaveHdr1->dwBufferLength = OUT_BUFFER_SIZE ; pWaveHdr1->dwBytesRecorded = 0 ; pWaveHdr1->dwUser = 0 ; pWaveHdr1->dwFlags = 0 ; pWaveHdr1->dwLoops = 1 ; pWaveHdr1->lpNext = NULL ; pWaveHdr1->reserved = 0 ; waveOutPrepareHeader (hWaveOut, pWaveHdr1, sizeof (WAVEHDR)) ; pWaveHdr2->lpData = pBuffer2 ; pWaveHdr2->dwBufferLength = OUT_BUFFER_SIZE ; pWaveHdr2->dwBytesRecorded = 0 ; pWaveHdr2->dwUser = 0 ; pWaveHdr2->dwFlags = 0 ; pWaveHdr2->dwLoops = 1 ; pWaveHdr2->lpNext = NULL ; pWaveHdr2->reserved = 0 ; waveOutPrepareHeader (hWaveOut, pWaveHdr2, sizeof (WAVEHDR)) ;