上位机MFC生成正弦波通过声卡输出源代码

上位机MFC生成正弦波通过声卡输出源代码

如上图，例程运行后，可以点击开始或停止。
会在电脑喇叭上听到例程输出声音。
例程可以作为正弦波发生器使用。
例程创建了一个集成类CSoundOut。
可以在外部实例化一个对象CSinGenerator m_SoundOut;
调用
m_SoundOut.OpenOutput();
m_SoundOut.CloseOutput();
就可以声音的输出与停止。
关键代码段

1. 
   
2. MMRESULT CSoundOut::OpenOutput()
   
3. {
   
4.      MMRESULT result;
   
5. 
   
6.     result=waveOutGetNumDevs();
   
7.         if (result == 0)
   
8.         {
   
9.         AfxMessageBox("No Sound Output Device");
   
10.                 return result;
    
11.         }
    
12. 
    
13.    // test for Mic available   
    
14.    result=waveOutGetDevCaps (0, &m_WaveOutDevCaps, sizeof(WAVEOUTCAPS));
    
15.    
    
16.    if ( result!= MMSYSERR_NOERROR)
    
17.    {
    
18.        AfxMessageBox(_T("Sound output Cannot determine card capabilities !"));
    
19.    }
    
20. 
    
21.         m_Terminate = FALSE;
    
22. #ifndef CALL_BACK_TEST
    
23.         // The SoundOut Devive is OK now we can create an Event  and start the Thread
    
24.         m_WaveOutEvent = CreateEvent(NULL,FALSE,FALSE,"WaveOutThreadEvent");
    
25.         m_WaveOutThread= AfxBeginThread(WaveOutThreadProc,this,THREAD_PRIORITY_TIME_CRITICAL,0,CREATE_SUSPENDED,NULL);   
    
26.         m_WaveOutThread->m_bAutoDelete = TRUE;
    
27. #endif
    
28. // start the thread at the end of the buffer init
    
29.         // init format
    
30.         WaveInitFormat(1/* mono*/,m_WaveOutSampleRate /* khz */,16 /* bits */);
    
31. 
    
32.         // Open Output
    
33. #ifdef CALL_BACK_TEST
    
34.         result = waveOutOpen( &m_WaveOut,0, &m_WaveFormat,(DWORD)WaveOutProc ,(ULONG)this ,CALLBACK_FUNCTION);
    
35. #else
    
36.         result = waveOutOpen( &m_WaveOut,0, &m_WaveFormat,(DWORD)m_WaveOutEvent ,NULL ,CALLBACK_EVENT);
    
37. #endif
    
38. 
    
39.         if ( result!= MMSYSERR_NOERROR)
    
40.         {
    
41.         AfxMessageBox(_T("Sound output Cannot Open Device!"));
    
42.             return result;
    
43.         }
    
44. 
    
45. 
    
46.         m_Toggle = 0;
    
47.         m_SizeRecord = m_NbMaxSamples;
    
48.     m_WaveHeader[m_Toggle].lpData = (CHAR *)&OutputBuffer[m_Toggle][0];
    
49.     m_WaveHeader[m_Toggle].dwBufferLength = m_SizeRecord*2;
    
50.         m_WaveHeader[m_Toggle].dwFlags = 0;
    
51. 
    
52.     result = waveOutPrepareHeader( m_WaveOut, &m_WaveHeader[m_Toggle], sizeof(WAVEHDR) );
    
53.   //MMRESULT waveOutPrepareHeader( HWAVEOUT hwi, LPWAVEHDR pwh, UINT cbwh );
    
54.    if ( (result!= MMSYSERR_NOERROR) || ( m_WaveHeader[m_Toggle].dwFlags != WHDR_PREPARED) )
    
55.    {
    
56.         AfxMessageBox(_T(" Sound Output Cannot Prepare Header !"));
    
57.             return result;
    
58.    }
    
59. 
    
60.    result = waveOutWrite( m_WaveOut, &m_WaveHeader[m_Toggle], sizeof(WAVEHDR) );
    
61.    if  (result!= MMSYSERR_NOERROR)
    
62.    {
    
63.         AfxMessageBox(_T(" Sound Output Cannot Write Buffer !"));
    
64.             return result;
    
65.    }
    
66. 
    
67. 
    
68.    // register the second frame don't wait for the end of the first one
    
69.    // so when we will be notified, this second frame will be currently output when we will reload the first one
    
70.         m_Toggle = 1;
    
71.         m_SizeRecord = m_NbMaxSamples;
    
72.     m_WaveHeader[m_Toggle].lpData = (CHAR *)&OutputBuffer[m_Toggle][0];
    
73.     m_WaveHeader[m_Toggle].dwBufferLength = m_SizeRecord*2;
    
74.         m_WaveHeader[m_Toggle].dwFlags = 0;
    
75. 
    
76.     result = waveOutPrepareHeader( m_WaveOut, &m_WaveHeader[m_Toggle], sizeof(WAVEHDR) );
    
77.   //MMRESULT waveOutPrepareHeader( HWAVEOUT hwi, LPWAVEHDR pwh, UINT cbwh );
    
78.    if ( (result!= MMSYSERR_NOERROR) || ( m_WaveHeader[m_Toggle].dwFlags != WHDR_PREPARED) )
    
79.    {
    
80.         AfxMessageBox(_T(" Sound Output Cannot Prepare Header !"));
    
81.             return result;
    
82.    }
    
83. 
    
84.    result = waveOutWrite( m_WaveOut, &m_WaveHeader[m_Toggle], sizeof(WAVEHDR) );
    
85.    if  (result!= MMSYSERR_NOERROR)
    
86.    {
    
87.         AfxMessageBox(_T(" Sound Output Cannot Write Buffer !"));
    
88.             return result;
    
89.    }
    
90. 
    
91. #ifndef CALL_BACK_TEST
    
92.         m_WaveOutThread->ResumeThread();
    
93. #endif
    
94. 
    
95.    return result;
    
96. }
    

复制代码

1. void CSoundOut::CloseOutput()
   
2. {
   
3.         if (m_WaveOut)
   
4.                 waveOutPause(m_WaveOut);
   
5.     Sleep(50);  // wait for the pause
   
6.         //        CloseHandle(m_WaveOut);
   
7.         m_Terminate = TRUE;
   
8.     if (m_WaveOutEvent )
   
9.                 SetEvent(m_WaveOutEvent);
   
10.     Sleep(50);  // wait for the thread to terminate
    
11. 
    
12.    if (m_WaveOut)
    
13.    {
    
14.                 waveOutReset(m_WaveOut);
    
15.                 waveOutClose(m_WaveOut);
    
16.    }
    
17. }

复制代码

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