Générateur de signal basse fréquence temps réel

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Description

Ce programme permet la fabrication en continu et en temps réel d'un signal sinusoîdal, 20 Hz à 20kHz. Changement de fréquence appliqué instantanément.

Source / Exemple : 


#include <windows.h>
#include "stdafx.h"
#include "resource.h"
#include <mmsystem.h>
#include <malloc.h>
#include <math.h>
#include <stdio.h>

#define BUFFER_SIZE 4096
#define SAMPLERATE 44100 
#define CANAUX 1 // mono
#define OCTETS 2 // 16 bit

double pi = 3.1415926535897932;

PBYTE Buffer;
BOOL flag_out_open = FALSE;

//****************************************************************************

BOOL CALLBACK DlgProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{

  static HWAVEOUT hWaveOut;
  static PBYTE pBufferOut1, pBufferOut2, pBufferOut3;
  static PWAVEHDR pWaveHdrOut1, pWaveHdrOut2, pWaveHdrOut3;
  static WAVEFORMATEX waveform;
  static long int i;
  static double j = 0;
  static float angle;
  static unsigned char val;
  static double frequence[19981];
  static char txt[128];

  if (msg == WM_INITDIALOG)
   {
    for(i=0; i<19981; i++)
     {
      sprintf(txt,"%1.1f Hz", 20000.0 - i);
      frequence[i] = 20000.0 - i;
      SendDlgItemMessage(hWnd, IDC_COMBO_frequence , CB_ADDSTRING , 0 , (LPARAM)txt);
     }
    SendDlgItemMessage(hWnd, IDC_COMBO_frequence, CB_SETCURSEL, 19560, 0);
    return 0;
   }

    

  if (msg == MM_WOM_OPEN)
   {
    flag_out_open = TRUE;
    waveOutPrepareHeader(hWaveOut, pWaveHdrOut1, sizeof(WAVEHDR));
    waveOutWrite(hWaveOut, pWaveHdrOut1, sizeof(WAVEHDR));
    waveOutPrepareHeader(hWaveOut, pWaveHdrOut2, sizeof(WAVEHDR));
    waveOutWrite(hWaveOut, pWaveHdrOut2, sizeof(WAVEHDR));
    waveOutPrepareHeader(hWaveOut, pWaveHdrOut3, sizeof(WAVEHDR));
    waveOutWrite(hWaveOut, pWaveHdrOut3, sizeof(WAVEHDR));
    return 0;
   }

  if (msg == MM_WOM_DONE)
   {
    if (OCTETS == 1)
     {
      for(i=0; i<BUFFER_SIZE; i++)
       {
        angle = 2 * pi * j * frequence[SendDlgItemMessage(hWnd, IDC_COMBO_frequence, CB_GETCURSEL , 0 , 0)] / SAMPLERATE;
        if (angle > 2 * pi) angle = angle - 2 * pi;
        val = 127 + 127 * sin(angle);
        Buffer[i] = (val & 255);
        j = j + 1;
       }
     }
    if (OCTETS == 2)
     {
      for(i=0; i<(BUFFER_SIZE>>1); i++)
       {
        angle = 2 * pi * j * frequence[SendDlgItemMessage(hWnd, IDC_COMBO_frequence, CB_GETCURSEL , 0 , 0)] / SAMPLERATE;
        if (angle > 2 * pi) angle = angle - 2 * pi;
        val = 32767 * sin(angle);
        Buffer[  2*i] = (char)(val & 255);
        Buffer[1+2*i] = (char)(val >> 8);
        j = j + 1;
       }
     }
    CopyMemory(((PWAVEHDR)lParam)->lpData, Buffer, BUFFER_SIZE);
    waveOutPrepareHeader(hWaveOut, ((PWAVEHDR)lParam), sizeof(WAVEHDR));
    waveOutWrite(hWaveOut, ((PWAVEHDR)lParam), sizeof(WAVEHDR));
    return 0;
   }

  if (msg == WM_COMMAND)
   {
    if (wParam == ID_START)
     {
      if(flag_out_open == TRUE)
       {
        MessageBox(hWnd,"périphérique déjà ouvert","Erreur",0);
        return 0;
       }     

      pWaveHdrOut1 = (PWAVEHDR) malloc(sizeof(WAVEHDR));
      pWaveHdrOut2 = (PWAVEHDR) malloc(sizeof(WAVEHDR));
      pWaveHdrOut3 = (PWAVEHDR) malloc(sizeof(WAVEHDR));
      
      Buffer      = (PBYTE)malloc(BUFFER_SIZE);
      pBufferOut1 = (PBYTE)malloc(BUFFER_SIZE);
      pBufferOut2 = (PBYTE)malloc(BUFFER_SIZE);
      pBufferOut3 = (PBYTE)malloc(BUFFER_SIZE);
    
      if(!pBufferOut1 || !pBufferOut2 || !pBufferOut3)
       {
        if(pBufferOut1) free (pBufferOut1);
        if(pBufferOut2) free (pBufferOut2);
        if(pBufferOut3) free (pBufferOut3);
        MessageBox(hWnd,"Erreur d'allocation de mémoire","Erreur",0);
        return TRUE;
       }     
    
      waveform.nChannels = CANAUX; // 1 pour mono 2 pour stereo
      waveform.wBitsPerSample = 8 * OCTETS; // 8 ou 16 bit
      waveform.nAvgBytesPerSec = SAMPLERATE * waveform.nChannels * waveform.wBitsPerSample/8; // nombre d'octets par seconde
      waveform.wFormatTag = 1; // 1 pour PCM
      waveform.nSamplesPerSec = SAMPLERATE; // frequence d'echantillonnage
      waveform.nBlockAlign = 1;
      waveform.cbSize = 0;

      if(waveOutOpen(&hWaveOut,WAVE_MAPPER,&waveform,(DWORD)hWnd,0,CALLBACK_WINDOW))
       {
        free(pBufferOut1);
        free(pBufferOut2);
        free(pBufferOut3);
        MessageBox(hWnd,"ouverture du périphérique de sortie impossible","WARNING",MB_OK);
        return 0;
       }    

      pWaveHdrOut1->lpData = (LPSTR)pBufferOut1;
      pWaveHdrOut1->dwBufferLength = BUFFER_SIZE;
      pWaveHdrOut1->dwBytesRecorded = 0;
      pWaveHdrOut1->dwUser = 0;
      pWaveHdrOut1->dwFlags = 0;
      pWaveHdrOut1->dwLoops = 0;
      pWaveHdrOut1->lpNext = NULL;
      pWaveHdrOut1->reserved = 0;    
      waveOutPrepareHeader(hWaveOut,pWaveHdrOut1,sizeof(WAVEHDR));
    
      pWaveHdrOut2->lpData = (LPSTR)pBufferOut2;
      pWaveHdrOut2->dwBufferLength = BUFFER_SIZE;
      pWaveHdrOut2->dwBytesRecorded = 0;
      pWaveHdrOut2->dwUser = 0;
      pWaveHdrOut2->dwFlags = 0;
      pWaveHdrOut2->dwLoops = 0;
      pWaveHdrOut2->lpNext = NULL;
      pWaveHdrOut2->reserved = 0;    
      waveOutPrepareHeader(hWaveOut,pWaveHdrOut2,sizeof(WAVEHDR));

      pWaveHdrOut3->lpData = (LPSTR)pBufferOut3;
      pWaveHdrOut3->dwBufferLength = BUFFER_SIZE;
      pWaveHdrOut3->dwBytesRecorded = 0;
      pWaveHdrOut3->dwUser = 0;
      pWaveHdrOut3->dwFlags = 0;
      pWaveHdrOut3->dwLoops = 0;
      pWaveHdrOut3->lpNext = NULL;
      pWaveHdrOut3->reserved = 0;    
      waveOutPrepareHeader(hWaveOut,pWaveHdrOut3,sizeof(WAVEHDR));

      return 0;
     }

    if (wParam == IDCANCEL)
     {
      if(MessageBox(hWnd, "Voulez-vous vraiment arrêter l'application en cours ?", "Real Time Audio",MB_YESNO|MB_ICONEXCLAMATION|MB_DEFBUTTON2) == IDNO)
       {
        return TRUE;
       }
      EndDialog(hWnd, 0);
      return 0;
     }
   }

  return 0;
}

//****************************************************************************
 
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
  DialogBox(hInstance, MAKEINTRESOURCE(IDD_DIALOG1),HWND_DESKTOP,DlgProc);
  return 0;
}

//****************************************************************************
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