自学教程：C++ waveInStart函数代码示例

void WaveInStart(WaveIn *waveIn, BOOL prep){    MMRESULT res;    res = waveInReset(waveIn->handler);    if(res) {        return;    }    // prepare header an add the buffer    waveIn->header.lpData = (char *) waveIn->data;    waveIn->header.dwBufferLength = waveIn->n * 2;    waveIn->header.dwBytesRecorded = 0;    waveIn->header.dwFlags = 0L;    waveIn->header.dwLoops = 0L;    waveIn->header.dwUser = 0L;    waveInPrepareHeader(waveIn->handler, &waveIn->header, sizeof(WAVEHDR));    res = waveInAddBuffer(waveIn->handler, &waveIn->header, sizeof(WAVEHDR));    if(res) {        return;    }    res = waveInStart(waveIn->handler);    if(res) {        return;    }}

//开始录音BOOL CWaveIn::OpenRecord(){    //已经开始录音    if (m_bRecord)    {        //返回        return FALSE;    }    //录音设备句柄无效    if(!m_hIn)    {        //返回        return FALSE;    }    //开始录音    m_mmr = waveInStart(m_hIn);    //出错    if (m_mmr)    {        //返回        return FALSE;    }    //设置录音开始标记    m_bRecord = TRUE;    //返回    return TRUE;}

int main(){   HWAVEIN   inStream;   HWAVEOUT outStream;   WAVEFORMATEX waveFormat;   WAVEHDR buffer[4];                             // pingpong buffers   waveFormat.wFormatTag      = WAVE_FORMAT_PCM;  // PCM audio   waveFormat.nSamplesPerSec  =           22050;  // really 22050 frames/sec   waveFormat.nChannels       =               2;  // stereo   waveFormat.wBitsPerSample  =              16;  // 16bits per sample   waveFormat.cbSize          =               0;  // no extra data   waveFormat.nBlockAlign     =      waveFormat.nChannels * waveFormat.wBitsPerSample / 2;   waveFormat.nAvgBytesPerSec =      waveFormat.nBlockAlign * waveFormat.nSamplesPerSec;   // Event: default security descriptor, Manual Reset, initial non-signaled   HANDLE event = CreateEvent(NULL, TRUE, FALSE, "waveout event");   waveInOpen(  &inStream, WAVE_MAPPER, &waveFormat, (unsigned long)event,       0, CALLBACK_EVENT);   waveOutOpen(&outStream, WAVE_MAPPER, &waveFormat, (unsigned long)event,       0, CALLBACK_EVENT);   // initialize the input and output PingPong buffers   int index;   for(index = 0; index < 4; index++) {      buffer[index].dwBufferLength = NUM_FRAMES * waveFormat.nBlockAlign;      buffer[index].lpData         = 	 (void *)malloc(NUM_FRAMES * waveFormat.nBlockAlign);      buffer[index].dwFlags        = 0;      waveInPrepareHeader(  inStream, &buffer[index], sizeof(WAVEHDR));   }   ResetEvent(event);   for(index= 0; index < 4; index++) // queue all buffers for input      waveInAddBuffer(inStream, &buffer[index], sizeof(WAVEHDR));   waveInStart(inStream);       while(!( buffer[1].dwFlags & WHDR_DONE)); // poll(!) for 2 full input buffers   // move the two full buffers to output   waveOutWrite(outStream, &buffer[0], sizeof(WAVEHDR));   waveOutWrite(outStream, &buffer[1], sizeof(WAVEHDR));   int inIndex = 2, outIndex = 0; // the next input and output to watch   while(1) {  // poll for completed input and output buffers      if(buffer[inIndex].dwFlags & WHDR_DONE) { // input buffer complete?	 waveInAddBuffer(  inStream, &buffer[inIndex],  sizeof(WAVEHDR));	 inIndex = (inIndex+1)%4;   // next buffer to watch for full      }      if(buffer[outIndex].dwFlags & WHDR_DONE) { // output buffer complete?	 waveOutWrite(    outStream, &buffer[outIndex], sizeof(WAVEHDR));	 outIndex = (outIndex+1)%4;   // next buffer to watch for empty      }   }}

bool CAudio::InitializeWaveIn(){	if (!waveInGetNumDevs())		return false;	MMRESULT	mmResult;	DWORD		dwThreadID = 0;	m_hThreadCallBack = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)waveInCallBack, (LPVOID)this, CREATE_SUSPENDED, &dwThreadID);	mmResult = waveInOpen(&m_hWaveIn, (WORD)WAVE_MAPPER, &(m_GSMWavefmt.wfx), (LONG)dwThreadID, (LONG)0, CALLBACK_THREAD);	if (mmResult != MMSYSERR_NOERROR)		return false;	for (int i = 0; i < 2; i++)	{		m_lpInAudioHdr[i]->lpData = (LPSTR)m_lpInAudioData[i];		m_lpInAudioHdr[i]->dwBufferLength = m_nBufferLength;		m_lpInAudioHdr[i]->dwFlags = 0;		m_lpInAudioHdr[i]->dwLoops = 0;		waveInPrepareHeader(m_hWaveIn, m_lpInAudioHdr[i], sizeof(WAVEHDR));	}		waveInAddBuffer(m_hWaveIn, m_lpInAudioHdr[m_nWaveInIndex], sizeof(WAVEHDR));	ResumeThread(m_hThreadCallBack);	waveInStart(m_hWaveIn);	m_bIsWaveInUsed = true;	return true;}

	/**	 * WAV
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