如何即时获得当前音频信息（大小、频率。。）？
问题点数：50、回复次数：1Top
1 楼gg（gg）回复于 2000-07-09 17:14:00 得分 50
愿意用MCI吗?还比较简单,给你个例子:
char errString[100];
UINT wDeviceID;
MCI_WAVE_OPEN_PARMS mciOpenParms;
MCI_PLAY_PARMS mciPlayParms;
MCIERROR mcierror;
MCI_STATUS_PARMS mciStatusParms;
MCI_SET_PARMS mciSetParms;
DWORD wavLength;
DWORD nowPosition;
mciOpenParms.lpstrDeviceType = "waveaudio";
mciOpenParms.lpstrElementName = 你的文件名;
if (mcierror = mciSendCommand(NULL, MCI_OPEN,
MCI_OPEN_ELEMENT /*| MCI_OPEN_SHAREABLE*/ | MCI_OPEN_TYPE | MCI_WAIT,
(DWORD)(LPVOID) &mciOpenParms))
{
// Failed to open device. Don't close it; just return error.
mciGetErrorString(mcierror,errString,100);
errString[0] = '1';
::AfxMessageBox(errString,MB_OK);
return (mcierror);
}
// The device opened successfully; get the device ID.
wDeviceID = mciOpenParms.wDeviceID;
// Set the time format.
mciSetParms.dwTimeFormat = MCI_FORMAT_BYTES;
if (mcierror = mciSendCommand(wDeviceID, MCI_SET, MCI_SET_TIME_FORMAT | MCI_WAIT,
(DWORD)(LPVOID) &mciSetParms))
{
mciGetErrorString(mcierror,errString,100);
errString[0] = '3';
::AfxMessageBox(errString,MB_OK);
mciSendCommand(wDeviceID, MCI_CLOSE, MCI_WAIT, NULL);
return (mcierror);
}
mciSendCommand(wDeviceID, MCI_CLOSE, MCI_WAIT, NULL);
mciOpenParms.lpstrElementName = 文件名;
mciOpenParms.lpstrDeviceType = "waveaudio";
if (mcierror = mciSendCommand(wDeviceID/*和上面有一点不一样*/, MCI_OPEN,
MCI_OPEN_ELEMENT /*| MCI_OPEN_SHAREABLE */| MCI_OPEN_TYPE | MCI_WAIT,
(DWORD)(LPVOID) &mciOpenParms))
{
// Failed to open device. Don't close it; just return error.
mciGetErrorString(mcierror,errString,100);
errString[0] = '5';
::AfxMessageBox(errString,MB_OK);
return (mcierror);
}
//取证个文件的大小,单位字节
mciStatusParms.dwItem=MCI_STATUS_LENGTH;
if (mcierror = mciSendCommand(wDeviceID, MCI_STATUS, MCI_STATUS_ITEM | MCI_WAIT,
(DWORD)(LPVOID)&mciStatusParms))
{
mciGetErrorString(mcierror,errString,100);
errString[0] = '7';
::AfxMessageBox(errString,MB_OK);
mciSendCommand(wDeviceID, MCI_CLOSE, MCI_WAIT, NULL);
return (mcierror);
}
wavLength=mciStatusParms.dwReturn;
// Begin playback.
if (mcierror = mciSendCommand(wDeviceID, MCI_PLAY, NULL,
(DWORD)(LPVOID) &mciPlayParms))
{
mciGetErrorString(mcierror,errString,100);
errString[0] = '8';
::AfxMessageBox(errString,MB_OK);
mciSendCommand(wDeviceID, MCI_CLOSE, MCI_WAIT, NULL);
return (mcierror);
}
do
{
Sleep(200);
//取当前播放的位置
// Get Current Position
mciStatusParms.dwItem=MCI_STATUS_POSITION;
if (mcierror = mciSendCommand(wDeviceID, MCI_STATUS, MCI_STATUS_ITEM | MCI_WAIT,
(DWORD)(LPVOID)&mciStatusParms))
{
mciGetErrorString(mcierror,errString,100);
errString[0] = '6';
::AfxMessageBox(errString,MB_OK);
mciSendCommand(wDeviceID, MCI_CLOSE, MCI_WAIT, NULL);
return (mcierror);
}
nowPosition=mciStatusParms.dwReturn;
if(StopVoice)
{
mciSendCommand(wDeviceID, MCI_CLOSE, MCI_WAIT, NULL);
StopVoice=FALSE;
return (1L);
}
}
while(nowPosition<wavLength);
mciSendCommand(wDeviceID, MCI_CLOSE, MCI_WAIT, NULL);
}
从我的程序中摘出来的,注重看各个功能函数,其它时序不要管,是我自己的需要.Top
