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waveOutOpen 函数说明

2010-07-21 13:27:41| 分类： VC++ | 标签： |举报 |字号大中小订阅

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使用心得：首先打开声音输出设备，然后初始化输出内存，并保证不要使用缓存；（调用waveOutPrepareHeader设置内存），然后通过回调函数进行状态通知。通过waveOutWrite进行声音播放；

最后调用waveOutUnprepareHeader释放内存，waveOutReset(m_hWaveOut);
waveOutClose(m_hWaveOut);关闭音频设备

//声明:
waveOutOpen(
lphWaveOut: PHWaveOut;   {用于返回设备句柄的指针; 如果 dwFlags=WAVE_FORMAT_QUERY, 这里应是 nil}
uDeviceID: UINT;         {设备ID; 可以指定为: WAVE_MAPPER, 这样函数会根据给定的波形格式选择合适的设备}
lpFormat: PWaveFormatEx; {TWaveFormat 结构的指针; TWaveFormat 包含要申请的波形格式}
dwCallback: DWORD        {回调函数地址或窗口句柄; 若不使用回调机制, 设为 nil}
dwInstance: DWORD        {给回调函数的实例数据; 不用于窗口}
dwFlags: DWORD           {打开选项}
): MMRESULT;               {成功返回 0; 可能的错误值见下:}

MMSYSERR_BADDEVICEID = 2; {设备ID超界}
MMSYSERR_ALLOCATED   = 4; {指定的资源已被分配}
MMSYSERR_NODRIVER    = 6; {没有安装驱动程序}
MMSYSERR_NOMEM       = 7; {不能分配或锁定内存}
WAVERR_BADFORMAT     = 32; {设备不支持请求的波形格式}

//TWaveFormatEx 结构:
TWaveFormatEx = packed record
wFormatTag: Word;       {指定格式类型; 默认 WAVE_FORMAT_PCM = 1;}
nChannels: Word;        {指出波形数据的通道数; 单声道为 1, 立体声为 2}
nSamplesPerSec: DWORD; {指定样本速率(每秒的样本数)}一般为8000
nAvgBytesPerSec: DWORD; {指定数据传输的平均速率(每秒的字节数)} 每秒的字节数:
nBlockAlign: Word;      {指定块对齐(单位字节), 块对齐是数据的最小单位}
wBitsPerSample: Word;   {采样大小(字节)}每个样本的BIT数目，一般为16
cbSize: Word;           {应该是该结构的大小}
end;
{16 位立体声 PCM 的块对齐是 4 字节(每个样本2字节, 2个通道)}

//打开选项 dwFlags 的可选值:
WAVE_FORMAT_QUERY = $0001;     {只是判断设备是否支持给定的格式, 并不打开}
WAVE_ALLOWSYNC    = $0002;     {当是同步设备时必须指定}
CALLBACK_WINDOW   = $00010000; {当 dwCallback 是窗口句柄时指定}
CALLBACK_FUNCTION = $00030000; {当 dwCallback 是函数指针时指定}

//如果选择窗口接受回调信息, 可能会发送到窗口的消息有:
MM_WOM_OPEN = $3BB;
MM_WOM_CLOSE = $3BC;
MM_WOM_DONE = $3BD;

//如果选择函数接受回调信息, 可能会发送给函数的消息有:
WOM_OPEN = MM_WOM_OPEN;
WOM_CLOSE = MM_WOM_CLOSE;
WOM_DONE = MM_WOM_DONE;
举例如下：

//回调函数

static void CALLBACK
SpeakerCallback (HWAVEOUT _waveoutdev, UINT uMsg, DWORD dwInstance,
DWORD dwParam1, DWORD dwParam2)
{
WAVEHDR *wHdr;
streamUtil * parentStream =NULL;

switch (uMsg)
    {
      case WOM_OPEN:
//          ms_message("SpeakerCallback : WOM_OPEN");
    DEBUG_HELPER->log("streamUtil",LM_DEBUG,"RECEIVE WOM_OPEN\n");
        break;
      case WOM_CLOSE:
      DEBUG_HELPER->log("streamUtil",LM_DEBUG,"RECEIVE WOM_CLOSE\n");
//        ms_message("SpeakerCallback : WOM_CLOSE");
        break;
      case WOM_DONE:
     parentStream = (streamUtil*)dwInstance;
   wHdr = (WAVEHDR *) dwParam1;
  // waveOutUnprepareHeader (parentStream->m_hWaveOut, wHdr, sizeof (WAVEHDR)) ;

        break;
   default:
    break;

    }
}

WAVEFORMATEX waveform;
waveform.wFormatTag  = WAVE_FORMAT_PCM;
waveform.nChannels  = channel;
waveform.nSamplesPerSec =rate;//8000
waveform.nAvgBytesPerSec=16000;
waveform.nBlockAlign =2;
waveform.wBitsPerSample =bits; //16
waveform.cbSize   =0;
    //初始化回调标志
dwFlag = CALLBACK_FUNCTION;
    if (devNumber != WAVE_MAPPER)
        dwFlag = WAVE_MAPPED | CALLBACK_FUNCTION;
   //打开设备
if (waveOutOpen(&m_hWaveOut,devNumber,&waveform,(DWORD) SpeakerCallback,(DWORD)this,dwFlag))  {

    DEBUG_HELPER->log("streamUtil",LM_ERROR,"Failed to open deice. (waveOutOpen:0x%i)\n", mr);
return -1;
}

//
//缓存的大小
m_bufLength = (rate/8000) * INP_BUFFER_SIZE;
for(int i=0;i<OUT_BUFFER_NUM;i++)
{
     //初始化输出缓存
   //m_outHdr[i]= reinterpret_cast<PWAVEHDR>(malloc(sizeof(WAVEHDR)));

  // m_outBuffer[i] = (PBYTE)malloc(1 * m_bufLength);

   memset(m_outBuffer[i],0,m_bufLength);

     m_outHdr[i].lpData          = (LPSTR)(m_outBuffer[i] );
   m_outHdr[i].dwBufferLength = m_bufLength ;
   m_outHdr[i].dwBytesRecorded = 0 ;
   m_outHdr[i].dwUser          = 0 ;
   m_outHdr[i].dwFlags         = 0 ;
  // m_outHdr[i].lpNext          = NULL ;
   m_outHdr[i].reserved        = 0 ;
   m_outHdr[i].dwLoops =0;
   waveOutPrepareHeader (m_hWaveOut, &(m_outHdr[i]), sizeof (WAVEHDR)) ;

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              blogAbstract:'<P\><SPAN\><FONT color=#008000\>使用心得：首先打开声音输出设备，然后初始化输出内存，并保证不要使用缓存；（调用waveOutPrepareHeader设置内存），然后通过回调函数进行状态通知。通过waveOutWrite进行声音播放；</FONT\></SPAN\></P\>\r\n<P\><SPAN\><FONT color=#008000\>最后调用waveOutUnprepareHeader释放内存，waveOutReset(m_hWaveOut);<BR\> <WBR\><WBR\> <WBR\><WBR\> waveOutClose(m_hWaveOut);关闭音频设备</FONT\></SPAN\></P\>\r\n<P\><SPAN\><FONT color=#008000\>//声明:<BR\></FONT\></SPAN\>waveOutOpen(<BR\> </P\>',
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